Joint transmission method and wireless communication device

Abstract

Embodiments of the present application provide a joint transmission method and a wireless communication device. The joint transmission method is executed by a user equipment (UE), and comprises reporting a UE capability to a cooperative entity, wherein the UE capability supports cooperation enhancement of a plurality of cooperative entities, the cooperation enhancement of the plurality of cooperative entities is applied to a scenario where the plurality of cooperative entities are scheduled by means of single downlink control information (DCI) to perform cooperative transmission, the number of the plurality of cooperative entities is greater than or equal to 2, and the number of the plurality of cooperative entities is used as one capability item of the UE capability; and scheduling the plurality of cooperative entities on the basis of the single DCI to perform cooperative transmission, and the UE feeding back information to at least one of the cooperative entities.

Description

Joint transmission method and wireless communication device TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of mobile communication technology, in particular to a joint transmission method and a wireless communication device. BACKGROUND

[0002] In the prior art standard, multiple Transmission / Reception Point (TRP) supporting coherent joint transmission is configured with multiple channel state information-reference signal (CSI-RS) resources with the same number of antenna ports, and the multiple CSI-RS resources are located in the same resource set. For modular large-scale multiple input multiple output (MIMO), since multiple antenna arrays may have different numbers of antenna ports, and the cooperative transmission mode adopted by the multiple antenna arrays may also be different, and when multiple arrays cooperate, different arrays may belong to the same control center or different control centers. Therefore, the corresponding channel measurement resource needs to be configured in combination with the number of antenna array supported ports, cooperative scenarios and ways, etc. The configuration mode of the CSI-RS resource in the existing standard cannot be applied to distributed large-scale MIMO transmission of multiple arrays. Distributed large-scale MIMO transmission can effectively solve the coverage problem and the deployment method is more flexible. However, for the existing multiple TRP cooperative transmission, especially for non-coherent transmission, there are still many deficiencies, for example, the number of cooperative TRPs supported is small, the number of antenna ports of multiple TRPs is the same, and only single code sub-transmission is supported. Therefore, a more flexible joint transmission method and a wireless communication device under distributed MIMO are needed to improve the problems existing in the prior art.

[0003] SUMMARY

[0004] Embodiments of the present application provide a joint transmission method and a wireless communication device.

[0005] The embodiment of the present application provides a joint transmission method, which is executed on a user equipment (UE), and the method comprises the following steps: reporting UE capability to a cooperative entity, wherein the UE capability supports multi-cooperative entity cooperative enhancement, the multi-cooperative entity cooperative enhancement is applied to a scene of single downlink control information (DCI) scheduling multi-cooperative entity cooperative transmission, the number of the multi-cooperative entities is greater than or equal to 2, and the number of the multi-cooperative entities is taken as a capability item of the UE capability; and feeding back information to at least one cooperative entity in the cooperative entity based on the single DCI scheduling multi-cooperative entity cooperative transmission.

[0006] Through the technical solution, the UE reports the UE capability to the cooperative entity, the UE capability supports multi-cooperative entity cooperative enhancement, and the multi-cooperative entity cooperative enhancement is applied to a scene of single downlink control information (DCI) scheduling multi-cooperative entity cooperative transmission. In this way, the UE can support coherent cooperative transmission, non-coherent cooperative transmission and partial coherent cooperative transmission of more than two cooperative entities with different antenna ports in the scene of single downlink control information (DCI) scheduling multi-cooperative entity cooperative transmission.

[0007] The embodiment of the present application provides a joint transmission method, which is executed on a user equipment (UE), and the method comprises the following steps: reporting UE capability to a cooperative entity, wherein the UE capability supports multi-cooperative entity cooperative enhancement, the multi-cooperative entity cooperative enhancement is applied to a scene of single downlink control information (DCI) scheduling multi-cooperative entity cooperative transmission, the number of the multi-cooperative entities is greater than or equal to 2, and the number of the multi-cooperative entities is taken as a capability item of the UE capability; and feeding back information to at least one cooperative entity in the cooperative entity based on the single DCI scheduling multi-cooperative entity cooperative transmission.

[0008] Through the technical solution, the UE reports UE capability to a cooperating entity, the UE capability supports multi-cooperating entity cooperation enhancement, and the multi-cooperating entity cooperation enhancement is applied to a scenario of multi-downlink control information (DCI) scheduling multi-cooperating entity cooperation transmission. In this way, the UE can support coherent cooperation transmission, non-coherent cooperation transmission, and partial coherent cooperation transmission of more than two cooperating entities with different antenna ports in the scenario of multi-downlink control information (DCI) scheduling multi-cooperating entity cooperation transmission.

[0009] The joint transmission method provided in the embodiment of the application is executed on a cooperating entity, and includes the following steps: receiving UE capability reported by a user equipment (UE), wherein the UE capability supports multi-cooperating entity cooperation enhancement, the multi-cooperating entity cooperation enhancement is applied to a scenario of single-downlink control information (DCI) scheduling multi-cooperating entity cooperation transmission, the number of the multi-cooperating entities is greater than or equal to 2, and the number of the multi-cooperating entities is taken as one capability item of the UE capability; and performing joint transmission based on the UE capability.

[0010] Through the technical solution, the cooperating entity receives the UE capability reported by the UE, the UE capability supports multi-cooperating entity cooperation enhancement, and the multi-cooperating entity cooperation enhancement is applied to a scenario of single-downlink control information (DCI) scheduling multi-cooperating entity cooperation transmission. In this way, the UE can support coherent cooperation transmission, non-coherent cooperation transmission, and partial coherent cooperation transmission of more than two cooperating entities with different antenna ports in the scenario of single-downlink control information (DCI) scheduling multi-cooperating entity cooperation transmission.

[0011] The joint transmission method provided in the embodiment of the application is executed on a cooperating entity, and includes the following steps: receiving UE capability reported by a user equipment (UE), wherein the UE capability supports multi-cooperating entity cooperation enhancement, the multi-cooperating entity cooperation enhancement is applied to a scenario of multi-downlink control information (DCI) scheduling multi-cooperating entity cooperation transmission, the number of the multi-cooperating entities is greater than or equal to 2, and the number of the multi-cooperating entities is taken as one capability item of the UE capability; and performing joint transmission based on the UE capability.

[0012] By the technical solution, the cooperation entity receives the UE capability reported by the UE, the UE capability supports multi-cooperation entity cooperation enhancement, and the multi-cooperation entity cooperation enhancement is applied to a scenario of multi-downlink control information (DCI) scheduling multi-cooperation entity cooperation transmission. In this way, the UE can support coherent cooperation transmission, non-coherent cooperation transmission, and partial coherent cooperation transmission of more than two cooperation entities with different antenna ports in the scenario of multi-downlink control information (DCI) scheduling multi-cooperation entity cooperation transmission.

[0013] The user equipment provided by the embodiment of the application comprises a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the joint transmission method.

[0014] The cooperation entity provided by the embodiment of the application comprises a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the joint transmission method.

[0015] The wireless communication device provided by the embodiment of the application comprises a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the joint transmission method.

[0016] The base station provided by the embodiment of the application comprises a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the joint transmission method.

[0017] The network element provided by the embodiment of the application comprises a processor and a memory. The memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to execute the joint transmission method.

[0018] The chip provided by the embodiment of the application is configured to implement the joint transmission method.

[0019] Specifically, the chip comprises a processor configured to call and run a computer program from a memory, so that a device installed with the chip executes the joint transmission method.

[0020] The computer readable storage medium provided by the embodiment of the application is configured to store a computer program, and the computer program enables a computer to execute the joint transmission method.

[0021] The computer program product provided by the embodiment of the present application comprises computer program instructions, which enable a computer to execute the joint transmission method described above.

[0022] The computer program provided by the embodiment of the present application, when running on a computer, enables the computer to execute the joint transmission method described above.

[0023] The above technical solution, the UE reports the UE capability to the cooperating entity, the UE capability supports multi-cooperating entity cooperation enhancement. The multi-cooperating entity cooperation enhancement is applied to the scene of single downlink control information (DCI) scheduling multiple cooperating entity cooperation transmission. The multi-cooperating entity cooperation enhancement is applied to the scene of multiple downlink control information (DCI) scheduling multiple cooperating entity cooperation transmission. In this way, the UE can support coherent cooperation transmission, non-coherent cooperation transmission and partial coherent cooperation transmission of more than two cooperating entities with different antenna ports in the scene of multiple downlink control information (DCI) scheduling multiple cooperating entity cooperation transmission. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0025] Fig. 1 shows a schematic diagram of several possible basic antenna modules;

[0026] Fig. 2 is a schematic diagram of a feedback process of channel state information (CSI) of a new radio (NR) standard;

[0027] Fig. 3 is a schematic diagram of UE joint generation of a hybrid automatic repeat request-acknowledgement (HARQ-ACK) codebook and feedback for a physical downlink shared channel (PDSCH) of different transmission / reception points (TRPs);

[0028] Fig. 4 is a schematic diagram of a wireless communication system architecture provided by the embodiment of the present application;

[0029] Figure 5A is a schematic diagram of a main air interface interaction process in a case of single DCI scheduling two cooperating entities according to an embodiment of the present application;

[0030] Figure 5B is a schematic diagram of a joint transmission method according to an embodiment of the present application;

[0031] Figure 5C is a schematic diagram of a joint transmission method according to an embodiment of the present application;

[0032] Figure 6A is a schematic diagram of all cooperating entities occupying one or two time slots to repeatedly transmit a number of data blocks according to an embodiment of the present application;

[0033] Figure 6B is a schematic diagram of inter-time-slot repeated transmission using a sequential mapping mode according to an embodiment of the present application;

[0034] Figure 6C is a schematic diagram of inter-time-slot repeated transmission using a cyclic mapping mode according to an embodiment of the present application;

[0035] Figure 7A is a schematic diagram of FDM and TDM multiplexing of single DCI according to an embodiment of the present application;

[0036] Figure 7B is a schematic diagram of FDM and TDM multiplexing of single DCI according to an embodiment of the present application;

[0037] Figure 7C is a schematic diagram of FDM and TDM multiplexing of single DCI according to an embodiment of the present application;

[0038] Figure 8A is a schematic diagram of SDM and TDM multiplexing of single DCI according to an embodiment of the present application;

[0039] Figure 8B is a schematic diagram of SDM and TDM multiplexing of single DCI according to an embodiment of the present application;

[0040] Figure 8C is a schematic diagram of SDM and TDM multiplexing of single DCI according to an embodiment of the present application;

[0041] Figure 9 is a schematic diagram of CSI-RS resource association to antenna modules according to an embodiment of the present application;

[0042] Figure 10A is a schematic diagram of a main air interface interaction process in a case of multiple DCI scheduling two cooperating entities according to an embodiment of the present application;

[0043] Figure 10B is a schematic diagram of a joint transmission method according to an embodiment of the present application;

[0044] Figure 10C is a schematic diagram of a joint transmission method according to an embodiment of the present application;

[0045] FIG. 11A is a schematic diagram of the TCI information indication field in the DCI being associated with multiple TCI states according to an embodiment of the present application;

[0046] FIG. 11B is a schematic diagram of the TCI information indication field in the DCI being associated with multiple TCI states according to an embodiment of the present application;

[0047] FIG. 12A is a schematic diagram of PDSCH enhancement under multi-DCI multi-cooperation entity according to an embodiment of the present application;

[0048] FIG. 12B is a schematic diagram of PDSCH enhancement under multi-DCI multi-cooperation entity according to an embodiment of the present application;

[0049] FIG. 12C is a schematic diagram of PDSCH enhancement under multi-DCI multi-cooperation entity according to an embodiment of the present application;

[0050] FIG. 13 is a schematic structural diagram of a wireless communication device according to an embodiment of the present application;

[0051] FIG. 14 is a schematic structural diagram of a chip according to an embodiment of the present application;

[0052] FIG. 15 is a schematic block diagram of a wireless communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0054] 5G extends the working frequency of the cellular system to the millimeter wave band compared to 4G, and according to the current research trend of 6G, 6G is likely to extend the working frequency band of the cellular system to the terahertz (THz) band. However, although the low frequency band is crucial for providing services to a large number of users in a large coverage area, the technical progress of 5G in the low frequency band is not satisfactory. Although it is ideal to use large-scale multiple input multiple output (MIMO) in the low frequency band, it is not practical in actual application due to the large antenna size. Modular large-scale MIMO is a technology that distributes large active antenna arrays into smaller standardized antenna modules, like Lego blocks. In this way, the advantages of large-scale MIMO can be achieved in the low frequency band (e.g., below 1 GHz) without being limited by space.

[0055] Modular massive MIMO can be seen as an evolution of structured distributed MIMO, which employs various pre-defined basic antenna modules and flexibly combines these modules to build a single antenna system. Figure 1 shows several possible basic antenna modules, which have a great similarity to Lego blocks. Not only rectangular antenna modules, but also other irregularly shaped antenna modules, such as L-shaped or arc-shaped antenna modules, can be installed on the corners of buildings or curved building surfaces. A set of horizontal antennas and a set of vertical antennas can guide beams in azimuth and elevation directions, respectively. Modular antennas not only conceptually resemble Lego blocks by flexibly aggregating multiple basic antenna modules, but also can overcome numerous challenges in on-site deployment, and can achieve various layouts / configurations by splicing multiple basic antenna modules.

[0056] Furthermore, the design of modular massive MIMO composed distributed MIMO is in line with the decoupled design philosophy of the Radio Access Network (RAN). The 5G RAN has evolved to split its functions into multiple decoupled units: Centralized Unit (CU), Distribution Unit (DU), and Radio Unit (RU). The decoupling of the RAN side not only can reduce deployment costs compared to deploying all RAN functions at each cell site, but also can easily achieve multi-cell cooperation by controlling a group of RUs with a DU and similarly controlling a group of DUs with a CU. It can be expected that the 6G RAN will be further developed based on the decoupling of the 5G RAN, given its cost and technical advantages. Modular massive MIMO composed distributed MIMO is very suitable for such a decoupled RAN architecture, as multiple distributed antenna units can be easily jointly controlled by a centralized cooperation entity as a single antenna system.

[0057] Modular massive MIMO makes the deployment of distributed MIMO more flexible, which is crucial for large-scale market adoption. Modular MIMO is particularly advantageous in low frequency bands (e.g., below 1 GHz), as base station antennas are limited by form factors in these frequency bands. By using basic antenna modules of different shapes, the required number of antenna elements can be obtained in scenarios where traditional systems cannot be implemented due to space constraints. It should be noted that the spectrum below 1 GHz covers more people than the mid-band of 1-6 GHz worldwide due to its superior coverage. Therefore, a large number of User Equipment (UEs) are multiplexed in a relatively small bandwidth in low frequency bands, resulting in poor user experience performance; this is a common pain point for many cellular operators. Modular massive MIMO can be a solution to improve the actual experience performance of most end users.

[0058] In addition to the flexible deployment aspect, modular massive MIMO can also provide additional throughput gain on top of the structured distributed MIMO. Compared with the structured distributed MIMO, modular massive MIMO can make the location distribution of antennas more diverse, thereby reducing the average distance from the transmission / reception point (TRP) to the user equipment (UE) and optimizing the antenna direction to achieve more efficient beam coverage. Furthermore, the increase in data rate will lead to a decrease in overall delay in the non-full buffer scenario. From a qualitative point of view, modular massive MIMO can also improve the reliability of the system. That is, in the event of a failure, the defective module can be quickly identified, removed and replaced, with minimal downtime and low cost. The above advantages of modular massive MIMO also apply to high frequencies. However, at high frequencies, a sufficient number of antenna elements can be integrated into a single antenna panel; therefore, the effectiveness of modular massive MIMO will be weakened, but from the perspective of interference management, jointly controlling multiple antenna panels also has certain benefits for interference management.

[0059] Obviously, in the above modular massive MIMO, each module can actually be regarded as an antenna array or an antenna panel. For the convenience of subsequent description, some embodiments of the present application uniformly describe the antenna array or panel. Secondly, multiple antenna arrays or panels can belong to the same control center, and the control center mentioned in some embodiments of the present application can be a base station / network side / cell / central baseband unit (BBU) / CU / DU, etc. Furthermore, the cooperation between multiple antenna arrays, antenna panels, TRPs, or base stations is collectively referred to as cooperation between cooperating entities.

[0060] The basic process of reporting new radio (NR) channel state information (CSI) is as follows:

[0061] The feedback process of the CSI of the NR standard is shown in FIG. 2. The measurement and feedback of the CSI mainly include four steps: step 1: the base station first issues configuration information for channel measurement before issuing a reference signal; step 2: the base station issues a reference signal for downlink channel measurement, such as a CSI-RS; step 3: the UE calculates the CSI according to the measurement reference signal issued by the base station and reports it to the base station; and step 4: the base station determines the precoding information for downlink data transmission according to the CSI reported by the UE and sends downlink data.

[0062] Single-DCI non-coherent joint transmission (NCJT) transmission:

[0063] In the existing standard of NR, single code sub-transmission is adopted in the range of level 1-4, and double code sub-transmission can be adopted in the transmission of level 5-8. Based on the above rules, for single-DCI multiple-TRP (M-TRP) NCJT transmission, only one code sub can be used in level 1-4, and the existing scheme cannot guarantee that all data layers of the same code sub are transmitted through the same TRP.

[0064] Secondly, according to the existing demodulation reference signal (DMRS) design rules, in order to ensure the orthogonality between the DMRS ports in the code-division multiplexing (CDM) group, the DMRS ports in the CDM group are required to be quasi-co location (QCL) (from the same transmission point). In this case, when NCJT transmission is performed, the control signaling needs to support the indication of DMRS allocation across CDM groups, and for the case of one pre-DMRS symbol, the DMRS signaling indication can support the case of cross-CDM group.

[0065] Furthermore, for the reception of the target reference signal, the terminal needs to obtain the required large-scale parameters from one or more QCL source signals. The current NR system introduces transmission configuration indication (TCI). The structure of the TCI state is {RS1|QCL-Type1, RS2|QCL-Type2} or {RS1|QCL-Type1}, where RS1 and RS2 are the identification information of the downlink reference signal, and QCL-Type1 and QCL-Type2 are the types of QCL. Each TCI state can include one or two downlink reference signals and the corresponding QCL type.

[0066] In Release 15 (Rel-15), the acquisition of QCL reference needs to go through three steps of Radio Resource Control (RRC) parameter configuration, Media Access Control (MAC) Control Element (CE) activation, and DCI indication. First, RRC parameters configure M TCI states, and the value of M depends on the terminal capability. Second, up to 8 TCI states are selected by MAC CE, and if M is less than or equal to 8, the TCI states are directly corresponding to the TCI information field in DCI. Finally, the TCI information field in the DCI format indicates up to 8 TCI states selected by the MAC CE. The terminal knows the QCL source signal of the received Physical Downlink Shared Channel (PDSCH) DMRS and the QCL type based on the TCI state. If the TCI information field is not included in the DCI, the PDSCH DMRS obtains the QCL reference from the TCI state of the Physical Downlink Control Channel (PDCCH), that is, the PDSCH DMRS and the PDCCH DMRS have the same QCL reference source.

[0067] In Release 16 (Rel-16), for single-DCI NCJT transmission, the TCI indication scheme is extended based on the TCI indication scheme in Rel-15. First, the set of available TCI states is configured by RRC, and then up to 8 TCI state combinations are selected by MAC CE, each combination can contain one or two TCI states. The 8 combinations correspond to the 8 values indicated by the TCI information field in the DCI. In order to determine the correspondence between each DMRS port and the TCI state, the mapping of the CDM group of DMRS to the TCI state is defined in Rel-16 specification. The specific mapping method is: the first DMRS port assigned to the terminal belongs to the CDM group corresponding to the first TCI state, and the DMRS port belonging to another CDM group corresponds to the second TCI state. The various modes of MTRP supported by single-DCI are shown in Table 1.

[0068] Table 1: Various modes of MTRP supported by single-DCI

[0069] M-DCI NCJT transmission:

[0070] The NCJT transmission under M-DCI mainly considers non-ideal backhaul between transmission points, and the channel conditions between multiple transmission points are relatively independent. From the perspective of scheduling and resource allocation, each transmission point has better flexibility by independently scheduling the corresponding PDSCH through multiple DCIs. In the M-DCI scheme, independent DCIs respectively schedule PDSCHs transmitted from different transmission points, and indicate the time point and resource used by the user to feed back HARQ-ACK. The terminal receives PDSCHs from different transmission points according to the DCI. The time-frequency resources of each PDSCH can not overlap, partially overlap, or completely overlap. The terminal also needs to perform independent or joint HARQ-ACK feedback based on the configured feedback mode.

[0071] Based on the M-DCI NCJT (Non-Joint Coherent Transmission) transmission, the terminal receives PDSCHs from different TRPs and feeds back the HARQ-ACK codebook as indicated. The terminal can generate HARQ-ACK codebooks for PDSCHs from different TRPs respectively and feed back them respectively. The terminal can also generate and feed back HARQ-ACK codebooks for PDSCHs from different TRPs jointly. The former is independent feedback, and the latter is joint feedback, as shown in FIG. 3. For joint feedback, the terminal combines the HARQ-ACK information corresponding to PDSCHs from different TRPs together, uses one physical uplink control channel (PUCCH) resource to feed back the HARQ-ACK to a certain TRP, and then transfers it to other TRPs. For independent feedback, the terminal feeds back the HARQ-ACK information corresponding to PDSCHs from different TRPs respectively. There is a corresponding relationship between the PUCCH resource carrying the HARQ-ACK codebook and the PDCCH / PDSCH.

[0072] The joint feedback HARQ-ACK mechanism is suitable for the scenario where the transmission points have ideal backhaul. When using independent feedback, the PUCCH resources of different TRPs need to have a time division multiple (TDM) relationship. In order to meet this condition, coordination needs to be performed between the transmission points. When using joint feedback, when the PUCCH resources of two TRPs overlap, they can be multiplexed and transmitted together. When the PUCCH resources of different TRPs do not overlap, they can be transmitted independently. From the perspective of PUCCH resource utilization, the joint feedback mode is more efficient. For joint HARQ-ACK feedback, the terminal determines the position of the HARQ-ACK information corresponding to the PDSCH transmitted by different TRPs in the joint HARQ-ACK codebook through CORESETPoolIndex.

[0073] The independent feedback HARQ-ACK mechanism is more robust than the joint feedback, and will not simultaneously lose the HARQ-ACK information of two TRPs because of blocking. For independent HARQ-ACK feedback, the terminal needs to place the HARQ-ACK information of the PDSCH transmitted by the same TRP in one HARQ-ACK codebook. R16 distinguishes TRPs by the CORESETPoolIndex parameter configured by the CORESET, that is, the HARQ-ACK information corresponding to the PDSCH scheduled by the control resource set (CORESET) with CORESETPoolIndex = 0 is placed in one HARQ-ACK codebook, and the HARQ-ACK information corresponding to the PDSCH scheduled by the CORESET with CORESETPoolIndex = 1 is placed in another HARQ-ACK codebook.

[0074] For independent HARQ-ACK feedback, if the terminal transmits multiple PUCCHs in overlapping orthogonal frequency division multiplexing (OFDM) symbols, it will cause the peak-to-average-power ratio (PAPR) to rise, so Rel-16 still does not support concurrent transmission of PUCCH. In order to ensure the quality and timeliness of PUCCH transmission, Rel-16 supports the terminal to feed back the HARQ-ACK information to different TRPs through different PUCCH resources in a time-division multiplexing manner within a slot.

[0075] The technical solutions of the embodiments of the present application can be applied to various wireless communication systems, for example: Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, 5G communication system or future wireless communication system, etc.

[0076] Some embodiments of the present application consider supporting up to 4 cooperative entities based on single DCI and multi-DCI non-coherent cooperative transmission on the basis of existing 2 TRP non-coherent cooperation. In the single DCI scenario, the schemes mainly involve configuration of group-based measurement resources, selection indication of the number of cooperative entities determined jointly by the network and the terminal, pre-defined and MAC CE / DCI joint TCI state activation / selection, allocation and indication of layer groups in more layer group transmission, and support for FDM+TDM, SDM+TDM multiplexing mode, etc. For the multi-DCI scenario, the schemes mainly involve increasing the number of CORESETs under BWP to adapt to more cooperative entities, pre-defined and MAC CE / DCI joint TCI state activation / selection, multi-BWP activation or single-BWP splitting to reduce PDSCH interference, etc. Based on the above schemes, non-coherent joint transmission and partial coherent joint transmission of multiple cooperative entities under distributed MIMO can be supported. The so-called partial coherent joint transmission refers to that among the multiple cooperative entities of cooperative transmission, part of the cooperative entities adopt coherent joint transmission mode for cooperative transmission, and then the remaining cooperative entities adopt non-coherent joint transmission mode for transmission. For example, there are 4 cooperative entities, among which cooperative entities 1 and 2 adopt coherent joint transmission mode for data transmission, and then cooperative entities 3 and 4 adopt non-coherent cooperative mode for data transmission.

[0077] Some embodiments of the present application can enable the terminal to support coherent cooperative transmission, non-coherent cooperative transmission, and partial coherent cooperative transmission of more than two cooperative entities with different antenna ports.

[0078] Secondly, in non-coherent transmission and partial coherent transmission, some embodiments of the present application support single DCI scheduling of SDM, TDM, FDM, FDM+TDM and SDM+TDM multiplexing mode of more than two cooperative entities. The above scheme can improve the throughput of the system on the one hand, and can reduce the system delay and improve the reliability of system transmission on the other hand.

[0079] Finally, the schemes proposed by some embodiments of the present application can support multi-DCI scheduling of non-coherent joint transmission of multiple cooperative entities (greater than or equal to 2), while also considering reducing the interference that may exist between multiple cooperative entities PDSCH and reducing the resource conflict problem of HARQ feedback.

[0080] Exemplarily, the wireless communication system 100 to which embodiments of the present application apply is shown in FIG. 4. The wireless communication system 100 can include a network device 110, which can be a device communicating with a user equipment 120 (UE). The network device 110 can provide communication coverage for a particular geographic area, and can communicate with user equipment located within the coverage area. Optionally, the network device 110 can be a cooperating entity. Optionally, the network device 110 can be a base station or a location management function (LMF) for providing positioning services. Optionally, the base station can be an evolved node B (eNB or eNodeB) in an LTE system, or the base station can be a mobile switching center, a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network device in a 5G network, or a base station in a future communication system, etc.

[0081] The wireless communication system 100 further includes at least one user equipment 120 within coverage of the network equipment 110. As used herein, "user equipment" includes, but is not limited to, an apparatus that is configured to receive / transmit communication signals via a wired connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection; and / or another data connection / network; and / or a wireless interface, such as for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and / or another user equipment; and / or an Internet of Things (IoT) device. A user equipment that is configured to communicate over a wireless interface can be referred to as a "wireless communication user equipment 120," a "wireless user equipment 120," or a "mobile user equipment 120." Examples of mobile user equipment 120 include, but are not limited to, a satellite or cellular telephone; a Personal Communications System (PCS) user equipment 120 that can combine a cellular radiotelephone with data processing, facsimile, and data communications capabilities; a PDA that can include a wireless radio telephone, a pager, Internet / intranet access, a Web browser, a calendar, and / or a global positioning system (GPS) receiver; and a conventional laptop and / or palmtop receiver, or other appliance that includes a wireless radio telephone transceiver. User equipment can refer to an access user equipment 120, subscriber unit, subscriber station, mobile station, mobile, remote station, remote user equipment, mobile equipment, wireless communication equipment, or user agent. An access user equipment 120 can be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device having wireless communication functions, a computing device, or another processing device connected to a wireless modem, an in-vehicle device, a wearable device, a user equipment in a 5G network, or a user equipment in a future evolved PLMN, etc.

[0082] In some embodiments of the present application, the user equipment 120 reports UE capability to the cooperating entity 110, wherein the UE capability supports multi-cooperating entity cooperation enhancement, the multi-cooperating entity cooperation enhancement is applied to a scenario of single downlink control information (DCI) scheduling multiple cooperating entity cooperation transmission, the number of the multiple cooperating entities is greater than or equal to 2, and the number of the multiple cooperating entities is taken as one capability item of the UE capability; based on the single DCI scheduling multiple cooperating entity cooperation transmission, the UE feeds back information to at least one of the cooperating entities. The feedback information is, for example, CSI feedback information and / or HARQ feedback information. In this way, the user equipment 120 can support coherent cooperation transmission, non-coherent cooperation transmission, and partial-coherent cooperation transmission of more than two cooperating entities with different antenna ports.

[0083] In some embodiments of the present application, the user equipment 120 reports UE capability to the cooperating entity 110, wherein the UE capability supports multi-cooperating entity cooperation enhancement, the multi-cooperating entity cooperation enhancement is applied to a scenario of single downlink control information (DCI) scheduling multiple cooperating entity cooperation transmission, the number of the multiple cooperating entities is greater than or equal to 2, and the number of the multiple cooperating entities is taken as one capability item of the UE capability; based on the single DCI scheduling multiple cooperating entity cooperation transmission, the UE feeds back information to at least one of the cooperating entities. The feedback information is, for example, CSI feedback information and / or HARQ feedback information. In this way, the user equipment 120 can support coherent cooperation transmission, non-coherent cooperation transmission, and partial-coherent cooperation transmission of more than two cooperating entities with different antenna ports.

[0084] Optionally, the user equipment 120 can perform device-to-device (D2D) communication.

[0085] Optionally, the 5G communication system or 5G network can also be referred to as a new radio (NR) system or NR network.

[0086] The wireless communication system 100 further includes a network 130. The network 130 can be an IP mobile communication network operated by a mobile communication operator. For example, the network 130 can be a core network of a mobile communication operator that operates and manages the wireless communication system 100, or can be a core network of a virtual mobile communication operator such as an MVNO (Mobile Virtual Network Operator).

[0087] The network 130 can be connected with the network device 110 as a relay device for transmitting user data. The user device 120 transmits and receives user data via the network 130. It should be noted that the communication of user data is not limited to IP communication, but can also be non-IP communication.

[0088] FIG. 4 exemplarily shows one network device 110, two user devices 120 and the network 130. Optionally, the wireless communication system 100 can include multiple network devices and each network device can include other number of user devices within its coverage range, which is not limited in the embodiments of the present application. The network 130 can include multiple cooperative entities.

[0089] Optionally, the wireless communication system 100 can further include a network controller, a mobile management entity, a network element and other network entities, which are not limited in the embodiments of the present application. For example, the network 130 can include a network controller, a mobile management entity, a network element and other network entities, which are not limited in the embodiments of the present application.

[0090] It should be understood that the devices with wireless communication function in the network / system in the embodiments of the present application can be referred to as wireless communication devices. Taking the wireless communication system 100 shown in FIG. 4 as an example, the wireless communication devices can include the network device 110, the user device 120 and the network 130 with communication function. The network device 110 and the user device 120 can be the specific devices described above, which will not be described herein again. The wireless communication devices can further include other devices (the network 130) in the wireless communication system 100. For example, the network 130 can include a network controller, a mobile management entity and other network entities, which are not limited in the embodiments of the present application.

[0091] It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and / or", herein, is merely descriptive of the associated relationship, which means that there can be three relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects. In some embodiments, the term "configuration" can refer to "pre-configuration" and "network configuration". The terms "define" or "predefine" in the embodiments of the present application can be achieved by pre-storing corresponding codes, tables or other indications of related information in devices (such as UEs and network devices). The present application does not limit the specific implementation. For example, "define" or "predefine" can refer to those defined in the protocol. It should also be understood that the "protocol" in the present application can refer to the standard protocol in the communication field, which can include the Long Term Evolution (LTE) protocol, the new radio (NR) protocol, and the related protocol applied in the future communication system. The present application does not limit this.

[0092] Some embodiments of the present application solve the following technical problems.

[0093] For multi-cooperation entity joint transmission, some embodiments of the present application consider single-DCI scheduling multi-cooperation entity enhanced transmission, and multi-DCI scheduling multi-cooperation entity enhanced transmission, while some embodiments of the present application extend the existing Multi-TRP cooperation transmission from the scene, and the multiple cooperation entities are not limited to only a single base station TRP receiving point, but consider a distributed MIMO scene based on modular antennas, which means that the multiple cooperation entities can be multiple antenna panels, antenna arrays, or TRPs belonging to a control center, or multiple antenna panels, antenna arrays, or TRPs belonging to multiple control centers. Some embodiments of the present application solve the technical problems from the following aspects. In order to facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions related to the embodiments of the present application are described below. The technical solutions of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment are described below, but the present application is not limited thereto.

[0094] First solution: single-DCI multi-cooperation entity transmission enhancement.

[0095] Figure 5A is a main air interface interaction flow in the case of single DCI scheduling two cooperating entities, some embodiments of the present application consider the scenario of single DCI scheduling more cooperating entities (greater than or equal to 2) cooperative transmission, the specific number of cooperating entities supported can be reported as the capability of the terminal, for example, the terminal reports that it supports N = 2, 3, or 4 cooperating entities for cooperation; Considering that different cooperating entities correspond to different antenna ports, and the difference in the way of cooperating entities cooperating, and other factors, some embodiments of the present application mainly provide specific solutions for the following aspects.

[0096] Figure 5B is a flowchart of a joint transmission method provided by an embodiment of the present application, as shown in Figure 5B, the joint transmission method is executed on a user equipment (User Equipment, UE), and includes at least one of the following operations: operation 701A: reporting UE capability to cooperating entities. Wherein, the UE capability supports multi-cooperating entity cooperation enhancement, the multi-cooperating entity cooperation enhancement is applied to the scenario of single downlink control information (Downlink Control Information, DCI) scheduling multiple cooperating entity cooperative transmission, the number of the multiple cooperating entities is greater than or equal to 2, and the number of the multiple cooperating entities is taken as a capability item of the UE capability. Operation 702A: based on the single DCI scheduling multiple cooperating entity cooperative transmission, the UE feeds back information to at least one of the cooperating entities. The feedback information is, for example, CSI feedback information and / or HARQ feedback information.

[0097] Through the above technical solution, the UE reports the UE capability to the cooperating entities, the UE capability supports multi-cooperating entity cooperation enhancement, and the multi-cooperating entity cooperation enhancement is applied to the scenario of single downlink control information (Downlink Control Information, DCI) scheduling multiple cooperating entity cooperative transmission. In this way, the UE can support coherent cooperative transmission, non-coherent cooperative transmission, and partial coherent cooperative transmission of more than two cooperating entities with different antenna ports in the scenario of single downlink control information (Downlink Control Information, DCI) scheduling multiple cooperating entity cooperative transmission.

[0098] FIG. 5C is a flow diagram of a joint transmission method according to an embodiment of the present application. As shown in FIG. 5C, the joint transmission method is performed on a cooperative entity, and includes the following at least one operation: operation 701C: receiving a UE capability reported by a user equipment (UE). The UE capability supports multi-cooperative entity cooperative enhancement, and the multi-cooperative entity cooperative enhancement is applied to a scenario of single downlink control information (DCI) scheduling multi-cooperative entity cooperative transmission. The number of the multi-cooperative entities is greater than or equal to 2, and the number of the multi-cooperative entities is taken as a capability item of the UE capability; operation 702C: performing joint transmission based on the UE capability.

[0099] Through the above technical solution, the cooperative entity receives the UE capability reported by the UE. The UE capability supports multi-cooperative entity cooperative enhancement, and the multi-cooperative entity cooperative enhancement is applied to a scenario of single downlink control information (DCI) scheduling multi-cooperative entity cooperative transmission. In this way, the UE can support coherent cooperative transmission, non-coherent cooperative transmission, and partial coherent cooperative transmission of more than two cooperative entities with different antenna ports in the scenario of single downlink control information (DCI) scheduling multi-cooperative entity cooperative transmission.

[0100] For multi-cooperative entity joint transmission, some embodiments of the present application consider single DCI scheduling multi-cooperative entity enhanced transmission and multi-DCI scheduling multi-cooperative entity enhanced transmission. Meanwhile, some embodiments of the present application extend the existing Multi-TRP cooperative transmission from the scene. The multiple cooperative entities are not limited to a single base station TRP reception point, but consider a distributed MIMO scenario based on modular antennas. This means that the multiple cooperative entities can be multiple antenna panels, antenna arrays, or TRPs belonging to a control center, or multiple antenna panels, antenna arrays, or TRPs belonging to multiple control centers.

[0101] Specifically, in some embodiments, the UE is, for example, the user equipment 120 shown in FIG. 4. The network device is, for example, the network device 110 shown in FIG. 4. The network device 110 is, for example, a cooperative entity or a base station or an LMF.

[0102] The first technical problem is: single-DCI multi-cooperation entity non-coherent cooperation multiplexing mode. Currently, NR supports single-DCI scheduling of non-coherent joint transmission of a maximum of 2 TRPs, PDSCH supports a maximum of 2 layers of TDM-A, TDM-B, FDM-A, FDM-B transmission mode, and a maximum of 8 layers of SDM transmission mode. The capacity is limited under TDM and FDM cooperation transmission. If the non-coherent joint transmission between more cooperation entities is expanded, it may be necessary to consider supporting more data layer transmission, resource allocation mode, transmission behavior, and flexible combination of multiplexing modes under different multiplexing modes. The first technical problem can be solved by the first embodiment to the fifth embodiment of the present application.

[0103] More multiplexing modes are supported for multi-cooperation entities (first embodiment to fifth embodiment):

[0104] In some embodiments of the present application, the multi-cooperation entity cooperation transmission includes multi-cooperation entity non-coherent joint transmission and / or multi-cooperation entity partial-coherent joint transmission. The so-called partial-coherent joint transmission refers to that among the multiple cooperation entities of the cooperation transmission, part of the cooperation entities adopt coherent joint transmission mode for cooperation transmission, and then the remaining cooperation entities adopt non-coherent joint transmission mode for transmission. For example, there are 4 cooperation entities, among which cooperation entities 1 and 2 adopt coherent joint transmission mode for data transmission, and then cooperation entities 3 and 4 adopt non-coherent cooperation mode for data transmission. In some embodiments of the present application, the multi-cooperation entity cooperation enhancement also supports multi-layer physical downlink shared channel (PDSCH) data transmission, which is a capability item of the UE capability. The multi-layer PDSCH data transmission can be 4-layer PDSCH data transmission, and at most 8-layer PDSCH data transmission. In some embodiments of the present application, the multi-cooperation entity cooperation enhancement also supports one or more of the following multiplexing modes: frequency division multiplexing (FDM) mode, time division multiplexing (TDM) mode, and space division multiplexing (SDM) mode, one or more of the FDM mode, the TDM mode, and the SDM mode being one or more capability items of the UE capability. The multi-cooperation entity cooperation enhancement also includes joint transmission of multiple multiplexing modes, such as supporting joint FDM plus TDM mode, and supporting joint SDM plus TDM mode.

[0105] The current NR standard supports two cooperative TRPs to perform cooperative transmission in SDM, TDM-A, TDM-B, FDM-A, FDM-B and other multiplexing modes, but only SDM supports more than two-layer transmission in the above multiplexing modes, and other multiplexing modes only support maximum two-layer PDSCH transmission. In order to improve system capacity and further reduce latency and improve reliability, some embodiments of the present application consider supporting more cooperative entity non-coherent joint transmission. In addition to supporting the existing multiplexing mode, the present application further considers supporting FDM+TDM, SDM+TDM multiplexing mode, and supporting more layers of PDSCH data transmission. The above features will be reported as the terminal capability, and based on the terminal reported capability, the control center will issue the corresponding configuration information.

[0106] First embodiment: M-TRP multiplexing mode based on single DCI

[0107] In some embodiments of the present application, the scheme of the first embodiment can be implemented in combination with the schemes of the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the schemes of multiple embodiments can be implemented in combination or independently.

[0108] In some embodiments of the present application, the multi-cooperation entity cooperation enhancement further supports one or more of the following multiplexing manners: frequency division multiplexing (FDM) manner, time division multiplexing (TDM) manner, and space division multiplexing (SDM) manner, one or more of the FDM manner, the TDM manner, and the SDM manner being one or more capability items of the UE capability. In some embodiments of the present application, the FDM manner includes one or more of a single-DCI FDM-A multiplexing manner, a single-DCI FDM-B multiplexing manner, the TDM manner includes one or more of a single-DCI TDM-A multiplexing manner, a single-DCI TDM-B multiplexing manner, and the SDM manner includes a single-DCI SDM multiplexing manner. Specifically, in some embodiments of the present application, the multi-cooperation entity cooperation enhancement further supports one or more of the following multiplexing manners: single-DCI FDM-A multiplexing manner, single-DCI FDM-B multiplexing manner, single-DCI TDM-A multiplexing manner, single-DCI TDM-B multiplexing manner, and single-DCI SDM multiplexing manner. The multi-cooperation entity cooperation enhancement further includes joint transmission of multiple multiplexing manners, for example, a joint manner supporting FDM plus TDM, and a joint manner supporting SDM plus TDM.

[0109] Specifically, some examples are given below as examples.

[0110] Case 1: Single-DCI SDM multiplexing manner

[0111] In some embodiments of the present application, in the single-DCI SDM multiplexing manner, the maximum number of cooperation entities is N, the maximum number of phase tracking reference signal (PTRS) antenna ports is N, and N is greater than or equal to 2. In some embodiments of the present application, N is equal to 3 or 4. In some embodiments of the present application, an association relationship between the PTRS antenna port and the demodulation reference signal (DMRS) antenna port is determined based on a predefined manner. In some embodiments of the present application, each PTRS antenna port is respectively associated with a DMRS antenna port corresponding to a lowest index value of a different transmission configuration indication (TCI) state.

[0112] For NR system, single-DCI SDM transmission mode currently only supports up to 2 TRPs, and each TRP can correspond to different phase noise, so the NR system supports 2 antenna ports for downlink PTRS in Multi-TRP scenario, and some embodiments of the application consider supporting more cooperative entities for cooperative transmission, which mainly considers SDM transmission based on single-DCI multi-cooperative entity, and the maximum number of cooperative entities is N, for example, N = 4, and for this reason, different cooperative entities can correspond to different phase noises, so up to N PTRS antenna ports can be required, and in order for the UE to use the correct antenna port to receive the PTRS signal, the association between the PTRS antenna port and the DMRS antenna port needs to be considered in the SDM mode.

[0113] Since different cooperative entities correspond to different TCI states, this embodiment points out that in the SDM multiplexing mode, the number of PTRS antenna ports configured by the UE is the same as the number of actually cooperative cooperative entities, at this time, the association between the PTRS port and the DMRS antenna port can be determined based on the standard predefined manner. For example, the standard predefines that each PTRS antenna port is respectively associated with the DMRS antenna port corresponding to the lowest index value of the different TCI states.

[0114] The value of N in the above scheme depends on the terminal's capability report, and the value of N can be 3 or 4, which can be reported as a terminal capability.

[0115] Case 2: single-DCI FDM-A multiplexing mode

[0116] Currently, NR supports a maximum of 2-layer FDM-A transmission mode for PDSCH, in which the frequency domain resources occupied by one PDSCH are divided into two groups, each group corresponding to one TRP, and each TRP transmits part of the PDSCH on one frequency domain group belonging to one PDSCH. For single-DCI multi-cooperative entity cooperative transmission, the maximum number of cooperative entities for cooperative transmission supported is N, for example, N = 4, for which the frequency domain resources occupied by one PDSCH can be divided into up to 4 groups, each group corresponding to one cooperative entity, and each cooperative entity transmits part of the PDSCH on one frequency domain group belonging to one PDSCH. Secondly, multiple cooperative entities can support a maximum of 4-layer or 8-layer PDSCH transmission, and each cooperative entity can be constrained to transmit a maximum of 1 or 2 layers of data.

[0117] Furthermore, it is required to configure maximum N TCI states for UE in one DCI, and the actual number of TCI states is equal to the number of cooperating entities. The ports of DMRS for PDSCH can come from one CDM group or different CDM groups, while the repetitionScheme in the high layer parameter RepetitionSchemeConfig is configured as fdmSchemeA. Based on the above configuration, the UE has different QCL assumptions for PDSCH data sent by different cooperating entities, i.e., the UE uses different TCI states indicated by DCI, while receiving multiple PDSCHs with frequency domain diversity.

[0118] In addition, in the existing standard, the UE assumes that the precoding matrix used by X consecutive PRBs in the frequency domain is the same, and X is the granularity of precoding. The X PRBs are referred to as a PRG. X is configured by a high layer parameter and can take values of {2, 4, full bandwidth}. This embodiment considers that the number of cooperating entities participating in cooperation can be 3. In order to achieve more flexible frequency domain resource allocation in cooperating entities, this embodiment considers supporting PRG containing more possible number of PRBs, i.e., more types of consecutive PRBs using the same precoding matrix. For this, this embodiment considers supporting X taking at least one value of {1, 2, 3, 4, 6, 8, full bandwidth}. The following respectively looks at the possible mapping relationship between PDSCH data information and PRBs when X takes different values, and at least one of the following schemes can be used:

[0119] Scheme one:

[0120] In some embodiments of the present application, in the FDM-A multiplexing manner of the single DCI, the number of maximum cooperation entities is N, N is greater than or equal to 2, the frequency domain resources occupied by one PDSCH are divided into at most N groups, each group corresponds to one cooperation entity, and each cooperation entity transmits part of the PDSCH on one frequency domain group of the PDSCH belonging to the cooperation entity. In some embodiments of the present application, the maximum PDSCH transmission of 4 layers or 8 layers is supported by multiple cooperation entities, and the maximum transmission of 1 or 2 or 4 layers of data is supported by each cooperation entity. In some embodiments of the present application, the UE is configured with a maximum of N TCI states in the single DCI, and the actual number of TCI states is equal to the number of cooperation entities. In some embodiments of the present application, the DMRS antenna port of the PDSCH is from one code division multiplexing (CDM) group. In some embodiments of the present application, the DMRS antenna port of the PDSCH is from different CDM groups. In some embodiments of the present application, if the precoding matrices used by X consecutive physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, X PRBs are called a physical resource group (PRG), and X takes at least one value from {1, 2, 3, 4, 6, 8, 16, full bandwidth}; and / or when X takes at least one value from {1, 2, 3, 4, 6, 8, 16, full bandwidth}, the mapping relationship between PDSCH data information and PRBs is determined based on the number of cooperation entities using a predefined manner; and / or each part of PDSCH data information is mapped to the corresponding frequency domain resource and transmitted by the corresponding cooperation entity or the cooperation entity corresponding to the TCI state.

[0121] When X takes any value from {1, 2, 3, 4, 6, 8, full bandwidth}, the mapping relationship between PDSCH data information and PRBs can be determined based on the number of cooperation entities using a standard predefined manner, for example, based on the number of cooperation entities Z or the number of configured TCI states Z, the first part of PDSCH information is mapped to the PRB with index Rem(b PRB / Z)=1, transmitted by cooperation entity 1 or the cooperation entity corresponding to the first TCI state; the second part of PDSCH information is mapped to the PRB with index Rem(b PRB / Z)=2, transmitted by cooperation entity 2 or the cooperation entity corresponding to the second TCI state; and the zth part of PDSCH information is mapped to the PRB with index Rem(b PRB / Z)=z, transmitted by cooperation entity z or the cooperation entity corresponding to the zth TCI state; and the Zth part of PDSCH information is mapped to the PRB with index Rem(b PRB / Z)=0, transmitted by cooperation entity Z or the cooperation entity corresponding to the Zth TCI state; wherein Rem is the remainder operator, b PRB is the index of the PRB, and the possible values of bPRB ∈{1,2,...,B}, B is the possible number of PRBs, for example, B = 273; z represents the zth cooperating entity z ∈{1,2,...,Z}, Z can be any one of 1-8. The first part of the PDSCH information is mapped to the PRB with index Rem(b PRB / Z) = 1, and is transmitted by the cooperating entity 1 or the cooperating entity corresponding to the first TCI state; the second part of the PDSCH information is mapped to the PRB with index Rem(b PRB / Z) = 2, and is transmitted by the cooperating entity 2 or the cooperating entity corresponding to the second TCI state.

[0122] Scheme two:

[0123] In some embodiments of the present application, each part of the PDSCH data information is mapped to each part of the PRB in index order for transmission, and is transmitted by the corresponding cooperating entity or the cooperating entity corresponding to the TCI state.

[0124] When X takes any one of {1, 2, 3, 4, 6, 8, full bandwidth}, the mapping relationship between the PDSCH data information and the PRB can be determined based on the number of cooperating entities in a standard predefined manner, for example, based on the number of cooperating entities Z or the number of configured TCI states Z, for example, the number of PRBs B configured to the terminal is equally divided based on the number of cooperating entities Z, then the PDSCH data information is also divided into Z parts, then each part is mapped to each part of the PRB in index order for transmission, wherein the first part of the PRB is transmitted by the cooperating entity 1 or the cooperating entity corresponding to the first TCI state, and the zth part of the PRB is transmitted by the cooperating entity z or the cooperating entity corresponding to the zth TCI state; if B cannot be divided by Z, the remaining part of the PRB can be divided into any part of the PRB, for example, into the last part of the PRB. For example, the number of PRBs B configured to the terminal is equally divided based on the number of cooperating entities Z, then the PDSCH data information is also divided into Z parts, then each part is mapped to each part of the PRB in index order for transmission.

[0125] Scheme three:

[0126] In some embodiments of the present application, X PRBs are split into Z parts, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, each part of PRB contains n consecutive PRBs, and the corresponding part in each PRG is sent by the corresponding cooperating entity or the cooperating entity of the corresponding TCI state. In some embodiments of the present application, the value of X is configured by a high layer radio resource control (RRC) parameter. In some embodiments of the present application, the value of X is indicated by a medium access control (MAC) control element (CE) or DCI. In some embodiments of the present application, multiple candidate values of X are configured by a high layer RRC parameter, and the value of X is indicated according to a MAC CE or DCI. In some embodiments of the present application, the value of X is indicated by a medium access control (MAC) control element (CE) or DCI. In some embodiments of the present application, multiple candidate values of X are configured by a high layer RRC parameter, and the value of X is indicated according to a medium access control (MAC) control element (CE) or DCI.

[0127] When the value of X is any one of {2, 3, 4, 6, 8, full bandwidth}, the mapping relationship between PDSCH data information and PRB can be determined in a standard predefined manner based on the number of cooperating entities, for example, based on the number of cooperating entities Z or the number of configured TCI states Z. Here, it is assumed that X is divisible by Z, X / Z=n, then X PRBs are split into Z parts, each part contains n consecutive PRBs, and then the zth (z∈{1, 2,..., Z}) part in each PRG is sent by the cooperating entity z or the corresponding cooperating entity of the zth TCI state. The above-mentioned splitting of PRB under RBG can also be n PRBs with a certain interval relationship, for example, the PRG contains 4 PRBs, and the number of cooperating entities is 2, then the PRBs numbered 1 and 3 are divided into the first part PRB, and the PRBs numbered 2 and 4 are divided into the second part PRB, i.e. interval Z-1 PRBs.

[0128] For the value of X in the above scheme, the following configuration methods can exist:

[0129] Method one: static configuration method, configured by a high layer RRC parameter; method two: dynamic configuration method, indicated by a MAC CE or DCI; method three: multiple candidate values are configured by a high layer RRC parameter, and the specific value can be dynamically indicated according to a MAC CE or DCI. Furthermore, the value of X and the support of the above-mentioned several schemes depend on the capability reported by the terminal.

[0130] Second embodiment: single DCI FDM-B multiplexing method:

[0131] In some embodiments of the application, the solution of the second embodiment can be implemented in combination with the solutions of the first, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, and / or seventeenth embodiments, or independently of the solutions of the first, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, and seventeenth embodiments. In some embodiments of the application, the solutions among multiple embodiments can be implemented in combination or independently.

[0132] For the existing system of NR, the main difference between FDM-B and FDM-A is that the FDM-B mode corresponds to two sequences of channel-encoded symbols, the two sequences of channel-encoded symbols are transmitted by two TRPs respectively, and the maximum supported layer group of PDSCH is 2 layers, and in this mode, the UE is allowed to perform soft combining of the two PDSCHs at the receiving end. In this mode, the frequency domain resources occupied by one PDSCH are divided into two groups, each group corresponds to one TRP, and each TRP transmits one sequence of channel-encoded symbols.

[0133] In some embodiments of the application, for single-DCI multi-cooperation entity cooperative transmission, the maximum number of cooperative entities supported by the cooperative transmission is N, for example, N = 4 / 8, and the cooperative transmission scheme that can be used for this purpose can be at least one of the following schemes:

[0134] Scheme one: all cooperative entities transmit a number of data blocks in frequency domain:

[0135] In some embodiments of the present application, in the FDM-B multiplexing manner of the single DCI, the frequency domain resources occupied by one PDSCH are divided into Z groups, each group corresponding to one cooperating entity, and each cooperating entity transmits one channel coded symbol sequence, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, and the UE supports at least one of {1, 2, 3, 4, 5, 6, 7, 8} layers of data transmission. In some embodiments of the present application, if the precoding matrices used by X consecutive physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, X PRBs are called a physical resource group (PRG), and X takes at least one of {1, 2, 3, 4, 6, 8, 16, full bandwidth}. In some embodiments of the present application, when X takes at least one of {1, 2, 3, 4, 6, 8, 16, full bandwidth}, the mapping relationship between PDSCH data information and PRB is determined in a predefined manner based on the number of cooperating entities. In some embodiments of the present application, each piece of PDSCH data information is mapped to the corresponding frequency domain resource and transmitted by the corresponding cooperating entity or the cooperating entity of the corresponding TCI state. In some embodiments of the present application, each piece of PDSCH data information is mapped to each part of PRB in turn according to the index order and transmitted by the corresponding cooperating entity or the cooperating entity of the corresponding TCI state. In some embodiments of the present application, X PRBs are divided into Z parts, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, each part of PRB contains n consecutive PRBs, and the corresponding part in each PRG is transmitted by the corresponding cooperating entity or the cooperating entity of the corresponding TCI state. In some embodiments of the present application, the value of X is configured by a high layer radio resource control (RRC) parameter. In some embodiments of the present application, the value of X is indicated by a medium access control (MAC) control element (CE) or DCI. In some embodiments of the present application, multiple candidate values of X are configured by a high layer RRC parameter, and the value of X is indicated according to the MAC CE or DCI. In some embodiments of the present application, the value of X is indicated by a medium access control (MAC) control element (CE) or DCI. In some embodiments of the present application, multiple candidate values of X are configured by a high layer RRC parameter, and the value of X is indicated according to the MAC CE or DCI.

[0136] As the number of cooperating entities increases, it can be necessary to support Z (2≤Z≤N) channel-encoded symbol sequences, and the frequency domain resources occupied by a PDSCH need to be divided into Z groups, each group corresponding to a cooperating entity, and each cooperating entity transmits a channel-encoded symbol sequence, Z is the number of cooperating entities actually participating in cooperation, and the terminal can support more layers of data transmission, for example, the terminal supports at least one of {1, 2, 3, 4, 5, 6, 7, 8} layers of data transmission. Secondly, the transmission blocks after different channel encoding carry the same data information, and the Z transmission blocks have the same modulation and coding scheme and transmission block size, and multiple cooperating entities occupy the same time domain resources, and different cooperating entities are associated with different TCI states. At the UE side, the UE has different QCL assumptions for the PDSCHs sent by different cooperating entities, that is, according to the multiple TCI states indicated by the DCI, the PDSCHs received in the frequency domain are diversified.

[0137] Furthermore, similar to the foregoing embodiments, in order to achieve more flexible frequency domain resource allocation in cooperating entities, it is considered here to support PRGs containing more possible PRB numbers, and for this, the embodiment considers supporting X taking at least one of {1, 2, 3, 4, 6, 8, full bandwidth}, X is the granularity of precoding, and the X PRBs are referred to as a PRG. The possible mapping relationship between PDSCH data information and PRBs when X takes different values can adopt at least one of schemes one to three in the first embodiment.

[0138] Scheme two: different cooperating entities can support different data layer transmission:

[0139] In some embodiments of the present application, in the single-DCI FDM-B multiplexing mode, the frequency domain resources occupied by a PDSCH are divided into Z groups, each group corresponding to a cooperating entity, and each cooperating entity transmits a channel-encoded symbol sequence corresponding to part of the data layers, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, all data layers are divided into two parts, each part contains a data layer group of any one of {1, 2, 3, 4, 5, 6, 7}, and the sum of the two data layer groups is equal to the total number of transmitted data layers.

[0140] As the number of cooperating entities increases, the terminal supports more layers of data transmission, for example, the terminal supports at least one of {1, 2, 3, 4, 5, 6, 7, 8} layers of data transmission. This embodiment considers that different cooperating entities can support different data layer transmission, different layers of data support at least one channel coding, and then the frequency domain resources occupied by a PDSCH are divided into Z (2≤Z≤N) groups, each group corresponds to a cooperating entity, each cooperating entity transmits a part of the symbol sequence of one channel coding corresponding to the data layer, and Z is the number of cooperating entities actually participating in cooperation. It is assumed here that all data layers are divided into two parts, and each part contains data layer groups which can be any one of {1, 2, 3, 4, 5, 6, 7}, and the sum of the two parts of data layer groups is equal to the total number of transmitted data layers. For example, 4 cooperating entities transmit 4 layers of data, of which cooperating entities 1 and 2 transmit the first two layers of data, and the first two layers of data are independently encoded, that is, cooperating entities 1 and 2 transmit different channel coding forms of the same data block; similarly, cooperating entities 3 and 4 transmit different coding forms of the last two layers of data blocks. And cooperating entities 1, 2, 3, and 4 occupy the same time domain resources, and different cooperating entities are associated with different TCI states. This scheme can divide even layers of data into two data blocks, each data block corresponds to the same layer group, and the data layers corresponding to the two data blocks are split in order, for example, if the layer group is 4, it is split into layers 1 and 2, and layers 3 and 4; odd layers of data can also be divided into two data blocks, and the division principle can be that the first data block contains (L+1) / 2 layers of data, and the second data block contains one less layer, or the first data block contains (L-1) / 2 layers of data, and the second data block contains one more layer. Secondly, if the number of cooperating entities is even, then half of the cooperating entities can be used to transmit data block one, and half of the cooperating entities can be used to transmit data block two, and the specific division of the cooperating entities is not restricted, which can be divided by index order, or it can be divided by index odd / even. If the number of cooperating entities is odd, the division principle can be that the first data block corresponds to the first (Z+1) / 2 cooperating entities, and the second data block uses the remaining cooperating entities, or the first data block corresponds to the first (L-1) / 2 cooperating entities, and the second data block uses the remaining cooperating entities. The above division can only be the division of the number of cooperating entities, and the specific selection of the cooperating entities is not restricted here.

[0141] Furthermore, the value of X / Z and the support of the above-mentioned several schemes depend on the terminal's reported capability, and the supported PDSCH layer group can be reported as a terminal capability, for example, the terminal can support 2, 4, 6, or 8 layers of layer groups, which are reported through corresponding signaling.

[0142] Third embodiment: single-DCI TDM-A multiplexing mode:

[0143] In some embodiments of the application, the scheme of the third embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the application, the schemes among multiple embodiments can be implemented in combination or independently.

[0144] Currently, NR supports a single-DCI scheduling, PDSCH supports a maximum of 2-layer TDM-A transmission mode, in which mode a PDSCH occupies different time-domain resources in the same slot for transmission, i.e., intra-slot repetition transmission, one TRP corresponds to one transmission, and two TRPs use different beams to send repeated PDSCH transport blocks.

[0145] For single-DCI multi-cooperation entity cooperative transmission, the maximum number of cooperative entities supported by the cooperative transmission is N, the actual number of cooperative entities participating in the cooperation is Z, for example, N = 4 or 8, and Z can be any value less than or equal to N, and more data layers can be supported, for example, a maximum of 4 layers or 8 layers of data transmission, and the maximum supported layer group depends on the terminal capability report; if multiple cooperative entities use TDM for data transmission, the specific scheme can use at least one of the following:

[0146] Scheme one: all cooperative entities occupy one or two slots to repeat a number of data blocks:

[0147] In some embodiments of the application, in the single-DCI TDM-A multiplexing mode, the time-domain resources occupied by a PDSCH in one or two slots are divided into a maximum of N groups, each group corresponding to a cooperative entity, each cooperative entity sends a repeatedly transmitted PDSCH transport block in different time domains, and multiple repeated PDSCH data blocks occupy the same frequency domain resources; and / or the number of slots occupied by multiple PDSCH transmissions is configured by one or more of RRC, MAC CE, and DCI, and the value is at least one of {1, 2}. In some embodiments of the application, the modulation and coding modes MCS corresponding to multiple repeated PDSCH data blocks are the same. In some embodiments of the application, the transport block sizes TBS corresponding to multiple repeated PDSCH data blocks are the same.

[0148] The time-domain resources occupied by a PDSCH in 1 or 2 slots can be divided into at most N groups in time domain, each group corresponding to a cooperating entity, each cooperating entity sending a PDSCH transmission block that is repeated in different time domains, and the multiple repeated PDSCH data blocks occupy the same frequency domain resources, and the corresponding MCS and TBS are also the same. The network side indicates the time domain position of the first transmitted PDSCH data block in the time domain resource allocation field (Time Domain Resource Allocation, TDRA) through DCI, including K0, the starting OFDM symbol and the length (Start and Length Indicator Value, SLIV) and the mapping type of the PDSCH. K0 is the number of slots between the DCI and the PDSCH it schedules, the default value is 0, and SLIV specifies the starting symbol and the number of consecutive symbols of a PDSCH transmission block. The starting position and the number of consecutive symbols of other repeated PDSCH transmission blocks in time domain can be determined in a standard predefined manner, for example, as shown in FIG. 6A, based on the time domain position of the first PDSCH transmission block indicated by the DCI, the relative offset of the second PDSCH transmission block relative to the time domain end symbol of the first transmission block can be determined in a standard predefined manner, k1, the relative offset of the third PDSCH transmission block relative to the time domain end symbol of the second transmission block is k2, and so on, the relative offset of the Zth PDSCH transmission block relative to the time domain end symbol of the Z-1th transmission block is kZ-1. The number of consecutive symbols of multiple PDSCH transmission blocks can be the same / different, and k1, k2,... kZ-1 can be the same / different; if the multiple PDSCH transmission blocks span two slots, the number of PDSCH transmission blocks transmitted in the two slots can be the same / different, and if the number is the same, the standard can constrain the time domain configuration of the PDSCH transmission block in the second slot to be the same as that in the first slot, including the starting position in time domain, the number of consecutive symbols, and / or the relative offset between multiple PDSCH transmission blocks. Secondly, the relative offsets k1, k2,... kZ-1 of multiple repeated PDSCH transmission blocks in time domain can be configured through RRC / MAC CE / DCI, and the specific possible values can be one or more of {0, 1, 2, 3, 4, 5, 6, 7}, and if k1, k2,... kZ-1 are the same, only one value needs to be configured; RRC+MAC CE or RRC+DCI configuration can also be used, for example, RRC configures multiple candidate offset values, and then MAC CE or DCI is used to dynamically indicate the selection of those or that candidate offset value.

[0149] Further, the number of slots occupied by the multiple PDSCH transmissions can also be configurable, and the specific configuration can be configured by RRC / MAC CE / DCI, and the specific value is at least one of {1, 2}. Meanwhile, RRC+MAC CE or RRC+DCI configuration mode can also be used, for example, RRC configures multiple candidate slot values, and then selects one of the candidate slot values through MAC CE or DCI dynamic indication.

[0150] Scheme two: multiple cooperative entities inter-slot repeated transmission of a data block:

[0151] In some embodiments of the present application, in the single-DCI TDM-A multiplexing mode, the time domain resources occupied by one PDSCH in one or two slots are divided into at most N groups, each group corresponding to one cooperative entity, and each cooperative entity transmits the PDSCH transmission block through inter-slot repetition transmission, and multiple repeated PDSCH data blocks occupy the same frequency domain resources. In some embodiments of the present application, the modulation and coding modes MCS corresponding to the multiple repeated PDSCH data blocks are the same. In some embodiments of the present application, the transport block sizes TBS corresponding to the multiple repeated PDSCH data blocks are the same. In some embodiments of the present application, the number of repeated transmissions of the PDSCH transmission block is any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}. In some embodiments of the present application, the number of repeated transmissions of the PDSCH transmission block is configured by one or more of RRC, MAC CE, and DCI. In some embodiments of the present application, the inter-slot repetition transmission adopts a sequential mapping or a cyclic mapping mode for transmission, the sequential mapping mode refers to at least one cooperative entity transmitting repeated PDSCH information in two or three consecutive slots, and the repeated PDSCH information corresponds to the same TCI state, and the cyclic mapping mode refers to multiple cooperative entities transmitting PDSCH transmission blocks by alternately changing TCI states, and the granularity of TCI change is one PDSCH transmission opportunity, and when all cooperative entities are traversed, the above process is repeated.

[0152] Scheme one mainly considers dividing a time slot into multiple time domain resources for repeated data transmission, without considering repeated transmission between time slots. For some special scenarios, such as mobile obstacles or channel blockage, repeated transmission between time slots can provide necessary spatial time diversity. For the above scenarios, the terminal is difficult to accurately obtain the best serving cooperative entity and related scheduling, so repeated transmission of data information on time slots is an important means to improve information transmission robustness. The scheme is to consider repeated transmission between time slots on the basis of scheme one, and the specific number of repeated transmissions can be any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}, and the specific configuration mode can be RRC / MAC CE / DCI configuration, or RRC configuration of multiple candidate values, and then dynamic selection through MAC CE or DCI.

[0153] Repeated transmission between time slots can adopt sequential mapping or cyclic mapping mode for transmission. The sequential mapping mode refers to that at least one cooperative entity transmits repeated PDSCH information in two or three consecutive time slots, and the repeated PDSCH information corresponds to the same TCI state. The cyclic mapping mode refers to that multiple cooperative entities alternately transmit PDSCH transport blocks through different TCI states, and the granularity of TCI change is one PDSCH transmission opportunity. When all cooperative entities are traversed, the above process is continued. If the control center configures the terminal with the sequential mapping mode, and the number of repeated transmissions R is greater than the number of cooperative entities Z, and is not greater than 2 or 3 times Z, at least one cooperative entity transmits repeated PDSCH information in two or three consecutive time slots, and the repeated PDSCH information corresponds to the same TCI state. The specific number of times of repeated transmission of multiple cooperative entities depends on the number of Rem(R / Z) or is indicated to the terminal by the control center, and the value can be twice or three times. The specific number of consecutive time slots in which the cooperative entity transmits repeated PDSCH information depends on Mod represents the division operator; for example, the number of repeated transmissions is 9 times, and the number of cooperative entities is 4, Rem(9 / 4)=1, and Thus, the first cooperative entity transmits repeated PDSCH information in three consecutive time slots, and the cooperative entities from the second cooperative entity transmit repeated PDSCH information in two consecutive time slots. The PDSCH corresponding to the same TCI state is repeated for the same cooperative entity. The advantage of this mode is that beam switching is not frequent. Furthermore, as shown in FIG. 6B, the number of repeated transmissions is 8, and the number of cooperative entities is 4, each cooperative entity transmits repeated information twice, or each TCI state transmits repeated information twice.

[0154] If the repetition pattern configured by the control center to the terminal is the cyclic mapping pattern, the granularity of TCI change is one PDSCH transmission opportunity, and the terminal can quickly obtain beam diversity gain in this transmission mode. In high frequency, even if a certain beam is blocked, the terminal still has the possibility to quickly and correctly receive PDSCH information. If the terminal can quickly judge whether the received PDSCH information is correctly demodulated, the terminal can no longer receive the remaining PDSCH transmission, so as to achieve the purpose of reducing power consumption. As shown in FIG. 6C, the number of cooperating entities is 4, each cooperating entity is associated with the same TCI state of PDSCH, and the number of repeated transmissions is 8 times, and the PDSCH information is repeatedly transmitted in the order of TCI 0, TCI 1, TCI 2, and TCI 3 in the cyclic mapping mode.

[0155] For the above two repetition modes, in order to obtain the soft combining gain of the data, if multiple PDSCH transmission blocks are associated with different TCI states, the control center configures different RV values for them. At present, the standard determines the RV value of another PDSCH transmission block by indicating the RV value of one PDSCH transmission block in the two-TRP scenario, and the cyclic order of the RV value is RV0-RV2-RV3-RV1. For this, when more PDSCH transmission blocks are transmitted using different TCI states, a similar RV value determination scheme as described above can be used. The control center indicates one RV value, and then determines the RV values of the other PDSCH transmission blocks based on the number of TCI states and the order of time domain repetition through a predefined manner. Specifically, the RV values of the repeated PDSCH transmission blocks using different TCI states are determined in the order of RV0-RV2-RV3-RV1, and the RV value of the first repetition is indicated by the control center. For example, in FIG. 6C, the control center indicates the RV value as 2, the starting PDSCH transmission block, the TCI state is 0, the RV value starts from RV2, then the TCI state is 1, the RV value should be RV3 according to the above order, the RV value of the TCI state is 2, the TCI state is 2, the RV value should be RV3 according to the above order, and the TCI state is 3, the RV value should be RV3 according to the above order.

[0156] Further, the value of N / Z and the support of the above-mentioned schemes depend on the terminal's reported capabilities, and the supported PDSCH layer groups can be reported as a terminal capability, for example, the terminal supports layer groups of 2, 4, 6, or 8, which are reported through corresponding signaling; at the same time, the number of repeated transmissions supported by the terminal can also be reported as a terminal capability, for example, the terminal reports that the number of repeated transmissions supported is any one or more of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}.

[0157] Fourth embodiment: FDM+TDM multiplexing mode of single DCI

[0158] In some embodiments of the present application, the scheme of the fourth embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the schemes among multiple embodiments can be implemented in combination or independently.

[0159] Currently, NR supports single-DCI scheduling, and PDSCH supports a maximum of 2-layer TDM-A transmission mode. In this mode, a PDSCH occupies different time-domain resources in the same slot for transmission, i.e., intra-slot repetition transmission, one TRP corresponds to one transmission, and two TRPs use different beams to send repeated PDSCH transport blocks.

[0160] For single-DCI multi-cooperation entity cooperative transmission, the maximum number of cooperative entities supported by the cooperative transmission is N, and the actual number of cooperative entities participating in the cooperation is Z, for example, N=4 or 8, and Z can be any value less than or equal to N, for example, N=4 or 8, and more data layers can be supported, for example, a maximum of 4 or 8 data layers are supported, and the maximum supported layer group depends on the terminal's capability report; in order to further increase the reliability of data transmission and reduce the delay of data transmission, this embodiment considers supporting a PDSCH to be transmitted in FDM+TDM mode, which can use at least one of the following schemes:

[0161] Scheme one: FDM-A+TDM

[0162] In some embodiments of the present application, in the FDM and TDM multiplexing manner of single DCI, one PDSCH adopts FDM-A and TDM multiplexing manner for transmission. In some embodiments of the present application, the PDSCH information transmitted by different cooperative entities is respectively associated with different TCI states. In some embodiments of the present application, the PDSCH information corresponding to different frequency domain resources under the same time domain resource belongs to one PDSCH transmission block and adopts the same redundancy version RV value. In some embodiments of the present application, the PDSCHs transmitted on different frequency domain resources have the same time domain repetition interval.

[0163] When the number of cooperative entities is even Z, for example, Z = 4, the resource occupied by the PDSCH in the frequency domain can be divided into Z / 2 parts, and the frequency domain resource occupied by the PDSCH can be one carrier or multiple carriers. When the PDSCH is mapped in the frequency domain, the control center maps the data information of the PDSCH onto the entire frequency domain resource, and then different cooperative entities transmit part of the frequency domain resource, and different cooperative entities correspond to different TCI states. The above multiplexing manner is similar to the multi-TRP multiplexing manner of FDM-A under single DCI in NR. For example, in FIG. 7A, after one PDSCH data information is mapped onto the frequency domain resource, cooperative entity 1 and cooperative entity 2 transmit information on part of the frequency domain resource respectively, and the information carried by the two parts of the frequency domain resource is PDSCH 0 and PDSCH 1 respectively. PDSCH 0 and PDSCH 1 occupy the same time domain resource and are associated with different TCI states.

[0164] Secondly, in order to increase the reliability of transmission, the PDSCH is repeatedly sent by different cooperative entities on different time domain resources, and the PDSCH information transmitted by the different cooperative entities is respectively associated with different TCI states. For example, as shown in FIG. 7A, it can be considered that PDSCH 2 and PDSCH 0 carry the same information or correspond to the same frequency domain resource, and PDSCH 2 can be regarded as a repetition of PDSCH 0 in the time domain; PDSCH 3 and PDSCH 1 carry the same information or correspond to the same frequency domain resource, and PDSCH 3 can be regarded as a repetition of PDSCH 1 in the time domain; and PDSCH 0-3 correspond to different TCI states respectively. It should be noted that the above PDSCH 0-PDSCH 3 is only for convenience of description, and in fact there can be different indexing or numbering manners.

[0165] Furthermore, the PDSCH information corresponding to different frequency domain resources under the same time domain resource can adopt the same RV value, which can be indicated by the RV field in the DCI, because it belongs to one PDSCH transport block and does not involve repeated data and soft combining. For example, PDSCH 0 / 2 and PDSCH 1 / 3 in FIG. 7A correspond to the same RV value. For the PDSCH repeatedly transmitted on the same frequency domain resource and different time domain resources, different RV values can be adopted, for example, PDSCH 0 / 1 and PDSCH 2 / 3 in FIG. 7A can be configured with different RV values. The RV value can be indicated by the RV indication field of the DCI. The standard only needs to indicate one RV value, and the other RV value can be determined by the standard in a predefined manner, for example, the relationship between the two TRP corresponding RV values in the existing NR standard under the TDM-A multiplexing manner of multiple TRPs can be adopted, which is not described here.

[0166] In addition, the interval of the PDSCH information repeatedly transmitted in the time domain is kt, and the PDSCH repeatedly transmitted on different frequency domain resources has the same time domain repetition interval. As shown in FIG. 7A, PDSCH 0 and PDSCH 2, and PDSCH 1 and PDSCH 3 have the same time domain interval, and the specific possible values can be one or more of {0, 1, 2, 3, 4, 5, 6, 7} OFDM symbols, and if not configured, the default is 0. The specific time interval kt can be configured by RRC / MAC CE / DCI, and can also adopt the configuration mode of RRC+MAC CE or RRC+DCI, for example, RRC configures multiple candidate offset values, and then selects those or the candidate offset value by MAC CE or DCI.

[0167] Scheme two FDM-B+TDM:

[0168] In some embodiments of the present application, in the FDM and TDM multiplexing manner of the single DCI, one PDSCH adopts the FDM-B and TDM multiplexing manner for transmission. In some embodiments of the present application, one PDSCH data information is simultaneously mapped to multiple parts of frequency domain resources, and the PDSCH information mapped on the multiple parts of frequency domain resources adopts different channel coding manners. In some embodiments of the present application, multiple PDSCH transport blocks with the same time domain and different frequency domains adopt different RV values. In some embodiments of the present application, multiple PDSCH transport blocks with different time domains and the same frequency domain adopt the same RV value or different RV values. In some embodiments of the present application, in the FDM and TDM multiplexing manner of the single DCI, if the precoding matrices used by X continuous physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, the X PRBs are referred to as a physical resource group (PRG), and X takes at least one value from {1, 2, 3, 4, 6, 8, 16, full bandwidth}. In some embodiments of the present application, when X takes at least one value from {1, 2, 3, 4, 6, 8, 16, full bandwidth}, the mapping relationship between the PDSCH data information and the PRB is determined in a predefined manner based on the number of cooperating entities. In some embodiments of the present application, each part of PDSCH data information is mapped to the corresponding frequency domain resource and transmitted by the corresponding cooperating entity or the cooperating entity corresponding to the TCI state. In some embodiments of the present application, each part of PDSCH data information is sequentially mapped to each part of PRB for transmission according to the index order, and transmitted by the corresponding cooperating entity or the cooperating entity corresponding to the TCI state. In some embodiments of the present application, X PRBs are split into Z parts, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, each part of PRB contains n continuous PRBs, and the corresponding part in each PRG is transmitted by the corresponding cooperating entity or the cooperating entity corresponding to the TCI state. In some embodiments of the present application, the value of X is configured through a high layer radio resource control (RRC) parameter. In some embodiments of the present application, the value of X is indicated through a medium access control (MAC) control element (CE) or DCI. In some embodiments of the present application, multiple candidate values of X are configured through a high layer RRC parameter, and the value of X is indicated according to the MAC CE or DCI.

[0169] Scheme one considers that different cooperative entities transmit different frequency domain resources under the mapping of the same PDSCH in the frequency domain resources. This way may cause the terminal to only receive part of the information under a certain time domain resource configuration due to the poor channel quality of a certain cooperative entity. Based on the same scenario of scheme one, this scheme considers mapping a PDSCH data information to multiple parts of the frequency domain resource, but the PDSCH information mapped on the multiple parts of the frequency domain resource adopts different channel coding methods, which is similar to the FDM-B multiplexing method adopted by the existing NR multi-TRP, that is, two TRPs transmit the same PDSCH information block, but the two TRPs transmit the PDSCH information block after different channel coding. For example, PDSCH 0 / 2 and PDSCH 1 / 3 in FIG. 7A are the same PDSCH information block, but different channel coding is adopted. Since multiple cooperative entities transmit the same data information, the data blocks transmitted by multiple cooperative entities can adopt the same / different MCS, and the multiple transport block sizes (Transport Block Size TBS) are the same.

[0170] In order to obtain the frequency domain diversity gain, the multiple PDSCH transport blocks with the same time domain and different frequency domains adopt different RV values, and the multiple PDSCH transport blocks with different time domains and the same frequency domain can adopt the same RV value or different RV values. For example, as shown in FIG. 7A, PDSCH 0 and PDSCH 1 adopt different RV values, while PDSCH 0 and PDSCH 2, and PDSCH 1 and PDSCH 3 can adopt the same or different RV values.

[0171] For scheme one and scheme two, the same time domain resource transmits part of the information of the same data block or different channel coding forms of the same data block in different frequency domain resources, and the above two schemes are all the layers of the transmitted PDSCH information, and the different cooperative entities also transmit all the layers of the PDSCH information. The transmission of the PDSCH information needs to go through precoding, and the granularity of the precoding can be at least one of X values {1, 2, 3, 4, 6, 8, full bandwidth}. Based on the granularity of the precoding, the mapping relationship between the PDSCH and the PRB can adopt the method mentioned in the first embodiment.

[0172] Scheme three: FDM-different layers+TDM:

[0173] In some embodiments of the present application, in the single-DCI FDM and TDM multiplexing manner, one PDSCH is transmitted in the FDM-different-layer and TDM multiplexing manner, where FDM-different-layer refers to different layers or layer groups of PDSCH information transmitted in different frequency domain resources under the same time domain resource. The layer group can be a plurality of consecutive layers. In some embodiments of the present application, the PDSCH information transmitted by different cooperating entities is respectively associated with different TCI states. In some embodiments of the present application, the PDSCHs transmitted in different frequency domain resources under the same time domain resource are configured with the same RV value. In some embodiments of the present application, different RV values are used for the PDSCHs repeatedly transmitted in the same frequency domain resource and different time domain resources. In some embodiments of the present application, the RV value is indicated by the RV indication field of the DCI. In some embodiments of the present application, in the single-DCI FDM and TDM multiplexing manner, one PDSCH is transmitted in the FDM and TDM-B multiplexing manner. In some embodiments of the present application, the FDM multiplexing manner includes one or more of the FDM-A multiplexing manner, the FDM-B multiplexing manner, and the FDM-different-layer and TDM multiplexing manner, where FDM-different-layer refers to different layers or layer groups of PDSCH information transmitted in different frequency domain resources under the same time domain resource. The layer group can be a plurality of consecutive layers. Different layers can be one layer or a plurality of layers. Taking 4 layers as an example, different layers can be 1-4 layers, for example, cooperating entities 1-4 respectively transmit 1-4 layers, or different layers can be 1-2 layers and 3-4 layers, for example, cooperating entity 1 transmits 1-2 layers and cooperating entity 2 transmits 3-4 layers.

[0174] In the first scheme and the second scheme, whether the same data block is partially transmitted in different frequency domain resources under the same time domain resource or the same data block is transmitted in different channel coding forms, the above two schemes are all about transmitting all layers of PDSCH information, and the scheme considers transmitting different layers or layer groups of PDSCH information in different frequency domain resources under the same time domain resource. The layer group can be a plurality of consecutive layers. The allocation of the specific layer group among a plurality of cooperating transmission cooperating entities can adopt the allocation manner in the tenth embodiment; for example, the control center transmits 4 layers of data to the terminal, based on FIG. 7A provided in the first scheme, PDSCH 0 can transmit the first two layers of data and PDSCH 1 can transmit the last two layers of data. The time domain repetition of the scheme is the same as that of the first scheme, that is, one or two time slots are divided into two parts, and the number of interval symbols of the two parts is configurable. For details, refer to the first scheme;

[0175] Secondly, in order to increase the reliability of transmission, the PDSCH is repeatedly transmitted by different cooperative entities on different time domain resources, and the PDSCH information transmitted by the different cooperative entities is respectively associated with different TCI states. For example, as shown in FIG. 7A provided by the first scheme, it can be considered that PDSCH 2 and PDSCH 0 carry the same information or the corresponding frequency domain resources are the same, PDSCH 2 can be regarded as a repetition of PDSCH 0 in the time domain; PDSCH 3 and PDSCH 1 carry the same information or the corresponding frequency domain resources are the same, PDSCH 3 can be regarded as a repetition of PDSCH 1 in the time domain; and PDSCH 0-3 correspond to different TCI states respectively. Note that the above PDSCH 0-PDSCH 3 is only for convenience of description, and in fact there can be different indexing or numbering methods.

[0176] Obviously, since different layers or layer groups of PDSCH data are transmitted on the same time domain resource and different frequency domain resources, soft combining of data is not performed, and therefore the PDSCH transport blocks transmitted on the same time domain resource and different frequency domain resources can be configured with the same RV value, which can be indicated by the RV field in the DCI; for example, PDSCH 0 / 2 and PDSCH 1 / 3 of FIG. 7A correspond to the same RV value. For PDSCH repeatedly transmitted on the same frequency domain resource and different time domain resources, different RV values can be used, for example, PDSCH 0 / 1 and PDSCH 2 / 3 in FIG. 7A can be configured with different RV values. The RV value can be indicated by the RV indication field of the DCI, and the standard only needs to indicate one RV value, and the other RV value can be determined by the standard in a predefined manner, for example, the relationship between the two TRP corresponding RV values in the existing NR standard can be used in the TDM-A multiplexing manner, which is not described here.

[0177] Furthermore, the transmission of PDSCH data needs to be precoded, and the granularity of precoding can be at least one of X values {1, 2, 3, 4, 6, 8, full bandwidth}. Since different PDSCH transport blocks on the frequency domain transmit different layers of PDSCH, the division of the frequency domain resources can consider that the entire frequency domain bandwidth is equally divided, and if there are several cooperative entities transmitting simultaneously, the corresponding frequency domain resources are divided into several parts, and the part that cannot be evenly divided can be considered to be added to any one of the equally divided frequency domain resources, for example, the last frequency domain resource, and the frequency domain resource and the bandwidth resource left over after the division are continuous.

[0178] Scheme four: the above scheme + TDM-B:

[0179] The above scheme one, scheme two and scheme three mainly consider the repeated transmission of the transmitted PDSCH data block in one or two time slots, without considering the repeated transmission between time slots. For some special scenarios, for example, mobile obstacles or channel blockage, the repeated transmission between time slots can provide necessary spatial time diversity. For the above scenarios, the terminal is difficult to accurately obtain the best service cooperation entity and related scheduling, so the repeated transmission of data information on the time slot is an important means to improve the robustness of information transmission. The scheme is to consider the repeated transmission between time slots on the basis of scheme one to three.

[0180] Similar to scheme one, the time domain resources occupied by the PDSCH transmission block in scheme one are considered to be extended from the time slot to the whole time slot. The scheme is to consider the repeated transmission between time slots on the basis of scheme one, and the specific number of repeated transmissions can be {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}, and the specific configuration mode can be RRC / MAC CE / DCI configuration, or RRC configuration of multiple candidate values, and then dynamic selection through MAC CE or DCI.

[0181] As shown in FIG. 7B, PDSCH 1 and PDSCH 2 respectively transmit part of the frequency domain resources in which the PDSCH information block is mapped. The repetition in the time domain can be transmitted in a sequential mapping mode or a cyclic mapping mode. The sequential mapping mode refers to at least one cooperating entity transmitting repeated PDSCH information in two or three consecutive slots, and the repeated PDSCH information corresponds to the same TCI state. The cyclic mapping mode refers to multiple cooperating entities alternately transmitting PDSCH transport blocks through different TCI states, with the granularity of TCI change being one PDSCH transmission opportunity. When all cooperating entities are traversed, the above process is repeated. If the control center configures the terminal with a sequential mapping mode, each cooperating entity repeatedly transmits PDSCH transport blocks using the same TCI state in consecutive slots. As shown in FIG. 7B, cooperating entity 1 and cooperating entity 3, cooperating entity 2 and cooperating entity 4 respectively transmit PDSCH transport blocks obtained by mapping the same PDSCH data on different frequency domain resources in two adjacent slots. If the control center configures the terminal with a cyclic mode, each cooperating entity alternately transmits PDSCH transport blocks through different TCI states, with the granularity of TCI change being one PDSCH transmission opportunity. In this transmission mode, the terminal can quickly obtain beam diversity gain. In high frequency, even if a certain beam is blocked, the terminal can still quickly and correctly receive PDSCH information. If the terminal can quickly determine whether the received PDSCH information is correctly demodulated, the terminal can no longer receive the remaining PDSCH transmission, thereby achieving the purpose of reducing power consumption. As shown in FIG. 7C, the number of cooperating entities is 4, each cooperating entity has the same TCI state associated with the PDSCH, and the number of repeated transmissions is 4. Cooperating entity 1 and cooperating entity 3 respectively repeat the transmission of the information carried by the first part of the frequency domain resources mapped by the PDSCH data in the TCI 0, TCI 2 cyclic mapping mode. Cooperating entity 2 and cooperating entity 4 respectively repeat the transmission of the information carried by the second part of the frequency domain resources mapped by the PDSCH data in the TCI 1, TCI 3 cyclic mapping mode. The mapping reference scheme of PDSCH in the frequency domain and the RV value configuration when the PDSCH is repeatedly transmitted in the time domain refer to the scheme two in the eighth embodiment.

[0182] Similarly, the scheme two and the scheme three can also be extended to the inter-slot repetition transmission in the above manner, the main difference between the extension of the scheme two and the extension of the scheme one lies in whether the PDSCH of the same time slot and different frequency domain resource transmission is using the same channel coding; the scheme one corresponds to that the PDSCH data is mapped to different frequency domain resources after channel coding, while the scheme two is that the PDSCH data is mapped to different frequency domain resources after different channel coding; and the difference between the extension of the scheme three and the extension of the scheme one / two lies in that the PDSCH data of different layers or layer groups of information is transmitted in the same time slot and different frequency domain resources; for example, 4 layers of data are transmitted, the same time slot frequency domain resource is divided into two parts, the first part transmits the first two layers of data, and the second part transmits the last two layers of data. The layer group can be a plurality of continuous layers.

[0183] Furthermore, the value of N / Z and the support of the above-mentioned several schemes depend on the terminal reporting capability, and the supported PDSCH layer group can be reported as a terminal capability, for example, the terminal supported layer group can be 2, 4, 6, or 8 layers, which is reported through corresponding signaling; at the same time, the terminal supported repetition transmission number can also be reported as a terminal capability, for example, the terminal reported support repetition transmission number can be any one or more of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}.

[0184] Fifth embodiment: single-DCI SDM+TDM multiplexing mode

[0185] In some embodiments of the application, the scheme of the fifth embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the application, the schemes among multiple embodiments can be combined for implementation, or can be implemented independently.

[0186] In some embodiments of the application, in the single-DCI SDM and TDM multiplexing mode, the TDM multiplexing mode includes one or more of TDM-A multiplexing mode and TDM-B multiplexing mode.

[0187] Currently, NR supports single-DCI scheduling, and PDSCH supports a maximum of 2-layer TDM transmission mode. In this mode, one PDSCH occupies different time-domain resources in the same slot for transmission, i.e., intra-slot repetition transmission. One TRP corresponds to one transmission, and two TRPs use different beams to send repeated PDSCH transmission blocks.

[0188] For single-DCI multi-cooperation entity cooperative transmission, the maximum number of cooperative entities supported for cooperative transmission is N, and the actual number of cooperative entities participating in cooperation is Z, for example, N = 4 or 8, and Z can be any value less than or equal to N, for example, N = 4 or 8, and more data layers can be supported, for example, a maximum of 4 or 8 data layers are supported. The maximum supported layer group depends on the terminal's capability report. To further increase the reliability of data transmission and reduce the latency of data transmission, and improve the throughput, this embodiment considers supporting one PDSCH using SDM+TDM for transmission, which can use at least one of the following schemes:

[0189] Scheme one: SDM+TDM-A:

[0190] In some embodiments of the present application, in the single-DCI SDM and TDM-A multiplexing mode, the time-domain resources occupied by one PDSCH in one or two slots are divided into a maximum of N groups, each group corresponding to one cooperative entity, and each cooperative entity sends a repeatedly transmitted PDSCH transmission block in different time domains. Multiple repeated PDSCH data blocks occupy the same frequency domain resources. In some embodiments of the present application, the modulation and coding modes MCS corresponding to multiple repeated PDSCH data blocks are the same. In some embodiments of the present application, the transport block sizes TBS corresponding to multiple repeated PDSCH data blocks are the same. In some embodiments of the present application, the number of slots occupied by multiple PDSCH transmissions is configured by one or more of RRC, MAC CE, and DCI, and the value is at least one of {1, 2}. In some embodiments of the present application, in the single-DCI SDM and TDM-A multiplexing mode, different cooperative entities or TCI states are used for data retransmission.

[0191] The number of cooperating entities is Z, the total layer group of transmission is R, R is less than the maximum layer group supported by the terminal, and the data of R layers is allocated to Z cooperating entities for transmission. The allocation of the layer group of data transmitted by each cooperating entity can refer to the allocation manner in the fifth embodiment, which will not be described here. Second, the PDSCH data transmitted is repeatedly transmitted in one time slot, thereby increasing the reliability of information transmission and reducing the information transmission delay. In the time domain, the time domain resources occupied by one PDSCH data in one time slot can be divided into at most N groups, for example, N is less than 4, each group repeatedly transmits PDSCH, and the multiple repeated PDSCH data blocks occupy the same frequency domain resource, and the corresponding MCS can be the same / different, and the TBS is the same. For example, as shown in FIG. 8A, considering three cooperating entities, the three cooperating entities occupy the same time-frequency domain resource to transmit part of the layers of the PDSCH data corresponding information, respectively corresponding to PDSCH transmission blocks 0, 1, and 2. It is assumed that PDSCH transmission blocks 0, 1, and 2 respectively transmit 1-2 layers, 3-4 layers, and 5-8 layers of PDSCH data, each transmission block corresponds to a different TCI state, and when the time domain is repeatedly transmitted, the same transmission block corresponds to the same TCI state, for example, in FIG. 8A, PDSCH transmission blocks 0, 1, and 2 respectively use the same TCI state as PDSCH transmission blocks 3, 4, and 5;

[0192] The control center indicates the time domain position of the first PDSCH data block of the transmission through the DCI in the time domain resource allocation field (Time Domain Resource Allocation, TDRA), including K0, the start OFDM symbol and the length indicator value (Start and Length Indicator Value, SLIV) and the mapping type of the PDSCH. K0 is the number of time slots between the DCI and the PDSCH it schedules, the default value is 0, and SLIV specifies the start symbol and the number of continuous symbols of a PDSCH transmission block. The starting position of other repeated PDSCH transmission blocks in the time domain and the number of continuous symbols can be determined in a standard predefined manner, for example, as shown in FIG. 8A, the standard determines the time domain position of the first PDSCH transmission block based on the DCI indication, corresponding to PDSCH transmission blocks 0, 1, and 2 in FIG. 8A, the relative offset of the second PDSCH transmission relative to the time domain end symbol of the first time can be determined in a standard predefined manner, kt is the symbol interval between the two repeated transmissions, the specific value can be one or more of {0, 1, 2, 3, 4, 5, 6, 7}, which can be configured through RRC / MAC CE / DCI; RRC+MAC CE or RRC+DCI configuration mode can also be used, for example, RRC configures multiple candidate offset values, and then MAC CE or DCI is used to dynamically indicate the selection of those or that candidate offset value. At the same time, the control center will also configure the number of repetitions for the terminal, and the configuration of the number of repetitions can have multiple ways, for example, it can be configured to repeat several times in each time slot, and the duration of the time slot is indicated, if the duration of the time slot is not indicated, it is defaulted to one time slot; or directly indicate how many times to repeat, the indication of the above information can be configured through RRC / MAC CE / DCI; RRC+MAC CE or RRC+DCI configuration mode can also be used, that is, RRC configures multiple candidate repetition values or time slot durations, and then MAC CE or DCI is used to dynamically indicate the selection of that value, and the specific number of repeated transmissions can be any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24};

[0193] Scheme two: SDM+TDM-B:

[0194] In some embodiments of the present application, in the single-DCI SDM and TDM-B multiplexing manner, the time domain resources occupied by one PDSCH in one or two slots are divided into at most N groups in the time domain, each group corresponding to one cooperating entity, each cooperating entity transmits the PDSCH transport block with inter-slot repetition transmission, and the multiple repeated PDSCH data blocks occupy the same frequency domain resources. In some embodiments of the present application, the modulation and coding schemes MCS corresponding to the multiple repeated PDSCH data blocks are the same. In some embodiments of the present application, the transport block sizes TBS corresponding to the multiple repeated PDSCH data blocks are the same. In some embodiments of the present application, the number of repetitions of the PDSCH transport block is any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}. In some embodiments of the present application, the number of repetitions of the PDSCH transport block is configured by one or more of RRC, MAC CE, and DCI. In some embodiments of the present application, the inter-slot repetition transmission adopts a sequential mapping or a cyclic mapping mode for transmission. The sequential mapping mode refers to at least one cooperating entity transmitting repeated PDSCH information in two or three consecutive slots, and the repeated PDSCH information corresponds to the same TCI state. The cyclic mapping mode refers to multiple cooperating entities alternately transmitting PDSCH transport blocks by different TCI states, with the granularity of TCI change being one PDSCH transmission opportunity. When all cooperating entities are traversed, the above process is continued.

[0195] For scheme one, intra-slot repetition transmission is mainly considered. Considering some special scenarios, such as mobile obstacles or channel blockage, inter-slot repetition transmission can provide necessary spatial and time diversity. For the above scenarios, the terminal is difficult to accurately obtain the best serving cooperating entity and related scheduling, so repeated transmission of data information in slots is an important means to improve information transmission robustness. At the same time, splitting PDSCH data into multiple data streams in space for transmission can improve the capacity of the system. Therefore, this scheme mainly considers the inter-slot repetition transmission of PDSCH data, and the specific implementation manner is similar to that of scheme one, except that the repetition period of the repeated PDSCH data block is extended to the inter-slot. For inter-slot repetition transmission, the control center needs to configure the number of repetitions for the terminal. The configuration of the number of repetitions can be performed in multiple ways, which can be configured by RRC / MAC CE / DCI. RRC+MAC CE or RRC+DCI configuration mode can also be used, that is, RRC configures multiple candidate repetition numbers, and then MAC CE or DCI is used to dynamically indicate to select one of them. The specific number of repetitions can be any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}.

[0196] As shown in FIG. 8B specifically: considering three cooperating entities, the three cooperating entities occupy the same time-frequency domain resources to transmit part of the layers of PDSCH data, corresponding to PDSCH transmission blocks 0, 1, and 2 respectively, it is assumed that PDSCH transmission blocks 0, 1, and 2 respectively transmit 1-2 layers, 3-4 layers, and 5-8 layers of PDSCH data, each transmission block corresponds to a different TCI state, and when time-domain repetition transmission is performed, the same transmission block corresponds to the same TCI state, for example, PDSCH transmission blocks 0, 1, and 2 in FIG. 8B use the same TCI state as PDSCH transmission blocks 3, 4, and 5 respectively.

[0197] Scheme three: SDM+TDM-A: The above-mentioned scheme one and scheme two use the same TCI state or cooperating entity to transmit the repeated data block when performing repetition transmission, whether it is intra-slot repetition transmission or inter-slot repetition transmission. However, if the channel of a certain cooperating entity or TCI state is continuously poor, it may cause that a part of the signal cannot be continuously received. To solve the above-mentioned problem, the present scheme is based on the above-mentioned scheme one, and considers using different cooperating entities or TCI states for data retransmission within a time slot. The indication information of the first transmission unit time domain resource, the allocation information of the layer group, and the configuration of the interval between the adjacent two transmission time domains are the same as those of scheme one, and the main difference lies in that the TCI of the time-domain repetition transmission is different. As shown in FIG. 8C specifically: cooperating entity 1 and cooperating entity 2 use the same time-frequency domain resources to transmit part of the layers of PDSCH information, corresponding to PDSCH transmission blocks 0 and PDSCH transmission blocks 1 respectively, and the two transmission blocks are associated with different TCI states; cooperating entity 3 and cooperating entity 4 use the same time-frequency domain resources to repeatedly transmit part of the layers of PDSCH information, wherein PDSCH 2 / 3 is a repetition of PDSCH 0 / 1, but PDSCH 2 / 3 and PDSCH 0 / 1 are associated with different TCI states.

[0198] Furthermore, because PDSCH 0 and PDSCH 1 transmit different layers or layer group information of PDSCH data, DCI can configure the same RV value for both, and PDSCH 2 and PDSCH 3 are repeated transmissions of PDSCH 0 and PDSCH 1, in order to be able to perform soft combining on both, PDSCH 0 / 1 and PDSCH 2 / 3 are configured with different RV values. The layer group can be a plurality of continuous layers. For this standard, only one RV value needs to be configured, and the RV value corresponding to the repeated PDSCH transmission block can be determined in a standard predefined manner, which is similar to the scheme in the eighth embodiment.

[0199] In addition, the value of N / Z and the support of the above-mentioned several schemes depend on the terminal reporting capability, and the supported PDSCH layer group can be reported as a terminal capability, for example, the terminal supported layer group can be 2, 4, 6, or 8 layers, which is reported through corresponding signaling; At the same time, the number of repeated transmissions supported by the terminal can also be reported as a terminal capability, for example, the terminal reported number of repeated transmissions can be any one or more of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}.

[0200] Second technical problem: Channel measurement CSI-RS resource configuration and antenna port mapping: In the existing technical standard, multiple CSI-RS resources with the same number of antenna ports are configured for multiple TRPs with coherent joint transmission, and multiple CSI-RS resources are located in the same resource set. For modular large-scale MIMO, the number of antenna ports of multiple antenna arrays may be different, and the cooperative transmission mode adopted by multiple antenna arrays may also be different. When multiple arrays cooperate, different arrays may belong to the same control center or different control centers. Therefore, it is necessary to configure the corresponding channel measurement resource in combination with the number of antenna ports supported by the antenna array, the cooperation scenario and mode, etc. The existing standard CSI-RS resource configuration method cannot be applied to large-scale MIMO transmission of multiple arrays. The sixth embodiment of the present application can solve the second technical problem.

[0201] Configuration of channel measurement resource (sixth embodiment):

[0202] In the modular distributed MIMO, the multiple cooperating entities can be multiple antenna arrays / panels in the distributed MIMO, which can belong to different base stations and have different antenna ports. Meanwhile, the multiple cooperating entities can adopt different cooperation modes: coherent joint transmission, non-coherent joint transmission, and partial coherent joint transmission. The partial coherent joint transmission means that some of the cooperating entities adopt the coherent joint transmission mode for cooperation transmission, and the rest of the cooperating entities adopt the non-coherent joint transmission mode for transmission. For example, there are four cooperating entities, of which cooperating entities 1 and 2 adopt the coherent joint transmission mode for data transmission, and then cooperating entities 3 and 4 adopt the non-coherent joint transmission mode for data transmission. Different cooperation transmission modes can correspond to different configurations of channel measurement resources. Some embodiments of the present application propose that the channel measurement resources corresponding to the multiple cooperating entities can belong to one channel measurement resource set or multiple channel measurement resource sets, and the multiple channel measurement resource sets can be grouped or divided into resource subsets to support different cooperation transmission modes according to the different cooperation transmission modes. Meanwhile, considering the diversity of the cooperating entity form, one measurement resource can correspond to multiple cooperating entities, or one cooperating entity can correspond to multiple measurement resources.

[0203] Sixth embodiment: CSI-RS measurement resource configuration

[0204] In some embodiments of the present application, the scheme of the first embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the schemes of multiple embodiments can be implemented in combination or independently.

[0205] In some embodiments of the present application, the joint transmission method further comprises receiving configuration information sent by the cooperating entity, the configuration information comprising configuration of measurement resources. In some embodiments of the present application, the measurement resources corresponding to the plurality of cooperating entities belong to one measurement resource set. In some embodiments of the present application, the measurement resources corresponding to the plurality of cooperating entities belong to a plurality of measurement resource sets. In some embodiments of the present application, one or more measurement resource sets group a plurality of resources according to different cooperating transmission modes. In some embodiments of the present application, one or more measurement resource sets divide resource subsets according to different cooperating transmission modes. In some embodiments of the present application, one measurement resource corresponds to a plurality of cooperating entities. In some embodiments of the present application, one cooperating entity corresponds to a plurality of measurement resources. In some embodiments of the present application, each cooperating entity corresponds to a measurement resource set, each measurement resource set contains at least one channel state information-reference signal (CSI-RS) resource, and a plurality of CSI-RS resources are configured with the same number of antenna ports or different numbers of antenna ports. In some embodiments of the present application, the relationship between a cooperating entity and a CSI-RS resource is one-to-one, one-to-many, or many-to-one.

[0206] In some embodiments of the present application, a plurality of CSI-RS resources under the same resource group correspond to antenna modules that employ coherent joint transmission or non-coherent joint transmission. In some embodiments of the present application, each cooperating entity is configured with at least one CSI-RS resource set for channel measurement, and each CSI-RS resource set contains at least one CSI-RS resource. In some embodiments of the present application, a plurality of antenna modules associated with CSI-RS resources under each CSI-RS resource set employ coherent joint transmission or non-coherent joint transmission. In some embodiments of the present application, a subset of CSI-RS resources is configured in a CSI-RS resource set, each subset of CSI-RS resources contains at least one CSI-RS resource, and the number of antenna ports of the CSI-RS resources in the subset of CSI-RS resources is the same or different. In some embodiments of the present application, a plurality of CSI-RS resources in the subset of CSI-RS resources employ coherent joint transmission or non-coherent joint transmission. In some embodiments of the present application, in the mode of coherent transmission, the CSI corresponding to part of the channel measurement resources is jointly fed back or independently fed back to one of the cooperating entities. In some embodiments of the present application, at least one cooperating entity serving the same UE is configured with a channel measurement resource set, the channel measurement resource set contains at least one channel measurement resource, and a plurality of channel measurement resources under the channel measurement resource set are divided into a plurality of channel measurement resource groups, the number of channel measurement resources in each channel measurement resource group is the same or different, and the number of antenna ports corresponding to each resource is the same or different.

[0207] For example, in some embodiments of the present application, for a modular massive MIMO system, multiple antenna modules can adopt the same antenna distribution or different antenna distributions, and different antenna distributions can correspond to different antenna ports. However, the existing standard does not support configuring different antenna ports under the same CSI-RS resource set. In addition, for the modular massive MIMO system mentioned in some embodiments of the present application, there can be coherent joint transmission of multiple antenna modules between base stations, coherent joint transmission of multiple antenna modules within the same base station, non-coherent joint transmission of multiple antenna modules within the base station, non-coherent joint transmission of multiple antenna modules between base stations, and combinations of the above. For example, multiple modules within the base station perform coherent transmission, and at the same time, non-coherent transmission with other base stations. For the above different working modes, how to configure the CSI-RS resource for channel measurement from the terminal network side, so as to simplify the resource configuration, reduce the terminal feedback overhead, support flexible antenna array combination, facilitate terminal calculation of CSI, and the like.

[0208] To solve the above problems, the present embodiment provides the following multiple schemes, and at least one of the following schemes can be used in the implementation process:

[0209] Scheme one: one-to-one: each control center corresponds to one measurement resource set, each resource set contains at least one CSI-RS resource, and multiple CSI-RS resources can be configured with the same number of antenna ports or different numbers of antenna ports. The relationship between the antenna module and the CSI-RS resource: one-to-one, one-to-many, and many-to-one. Each base station / TRP / cell / central unit (CU) / distribution unit (DU) configures a CSI-RS resource set for channel measurement, and the CSI-RS resource set contains at least one CSI-RS resource. Multiple CSI-RS resources can be configured with the same number of antenna ports or different numbers of antenna ports. The multiple CSI-RS resources under the same resource group adopt coherent joint transmission or non-coherent joint transmission. The correspondence between the antenna module and the CSI-RS resource can include at least one of the following ways:

[0210] The first mode: each antenna module corresponds to one CSI-RS resource, and the number of antenna ports measured by each antenna module is equal to the number of ports of the CSI-RS resource. Considering that multiple antenna modules corresponding to the same base station / TRP / cell / central unit (CU) / distribution unit (DU) may use different transmission modes, the standard may further constrain the configuration of the CSI-RS resource. In order to better distinguish the transmission modes used by different antenna modules, multiple CSI-RS resources in the same resource set may be divided into resource groups, and the antenna modules corresponding to the multiple CSI-RS resources in the same resource group use coherent joint transmission or non-coherent joint transmission, and the multiple antenna modules corresponding to different resource groups may also use coherent joint transmission or non-coherent joint transmission. Or, according to certain rules, multiple CSI-RS resources in multiple resource sets are divided into resource groups, for example, the same number of the first one or several in multiple CSI-RS resource sets form one or more CSI-RS resource groups, and the antenna modules associated with the multiple CSI-RS resources in the same resource group may use coherent joint transmission or non-coherent joint transmission, or the antenna modules corresponding between multiple resource groups use coherent or non-coherent joint transmission. Or, part or all of the CSI-RS resources in each resource set in multiple resource sets are divided into resource groups, and the multiple antenna modules associated with the same resource group use coherent joint transmission or non-coherent joint transmission, and the multiple antenna modules corresponding between different resource groups may also use coherent joint transmission or non-coherent joint transmission. Each CSI-RS resource group in the above resource configuration scheme contains at least one CSI-RS resource, and the resources in different CSI-RS resource groups can form resource pairs, each resource pair contains at least one resource in each resource group, the number of antenna ports of the CSI-RS resources in each resource pair can be the same or different, and the antenna modules corresponding to the CSI-RS resources in each resource pair can use coherent joint transmission or non-coherent joint transmission. Furthermore, the same CSI-RS resource can be associated with at least one CSI-RS resource pair. The above mode is helpful to realize flexible transmission mode combination between different antenna modules.

[0211] The second mode: a plurality of antenna modules can correspond to one CSI-RS resource, the sum of the antenna port numbers corresponding to the plurality of antenna modules is less than or equal to the antenna port number of the CSI-RS resource; the plurality of antenna modules corresponding to the same CSI-RS resource can adopt coherent or non-coherent joint transmission mode; when the antenna port number of the CSI-RS is greater than the antenna port number corresponding to the plurality of modules, the excess port number is not effective, and the terminal does not process it when measuring the channel, and the specific port number that is not effective can be indicated by the network side or constrained by the standard, for example, one or more ports with larger / smaller standard constraint port number are not effective; this mode can support flexible antenna module configuration, and the maximum antenna port number supported by each antenna module is also relatively flexible.

[0212] The third mode: one antenna module can be associated with a plurality of CSI-RS resources, the plurality of CSI-RS resources form a CSI-RS resource group, and the sum of the antenna port numbers of all CSI-RS resources in the CSI-RS resource group is greater than or equal to the antenna port number corresponding to the antenna module; this configuration mode can support larger antenna arrays.

[0213] It should be noted that the above three modes are not independent, and the above three modes can be satisfied at the same time, for example, assuming that there are two antenna modules panel 1 and panel 2, and three CSI-RS resources R1, R2 and R3 are configured by the network side, as shown in FIG. 9, the CSI-RS resource R1 is associated with the antenna module panel 1, the CSI-RS resource R2 is simultaneously associated with the antenna module panel 1 and the antenna module panel 2, and the CSI-RS resource R3 is associated with the antenna module panel 3.

[0214] The configuration of the CSI-RS resource group involved in the above three configuration modes can be configured by RRC parameters, MAC CE, DCI, or can be determined by standard constraint (predefined).

[0215] Scheme two: one-to-many: each control center configures at least one CSI-RS resource set for channel measurement, and each CSI-RS resource set contains at least one CSI-RS resource. The multiple antenna modules associated with the CSI-RS resources under each CSI-RS resource set can adopt coherent joint transmission or non-coherent joint transmission. Each base station / TRP / cell / central unit (CU) / distribution unit (DU) configures at least one CSI-RS resource set for channel measurement, and each CSI-RS resource set contains at least one CSI-RS resource, and the multiple CSI-RS resources can be configured with the same number of antenna ports or different numbers of antenna ports, and the number of CSI-RS resources contained under each CSI-RS resource set can be the same or different, wherein the association between the CSI-RS resource and the antenna module can be one of the three ways in scheme one, or multiple of the three ways. The multiple antenna modules associated with the CSI-RS resources under each CSI-RS resource set can adopt coherent joint transmission or non-coherent joint transmission; and on this basis, the multiple antenna modules associated with the multiple CSI-RS resource sets can also adopt coherent joint transmission or non-coherent joint transmission, and the multiple CSI-RS resource sets here can belong to the same base station / TRP / cell / central unit (CU) / distribution unit (DU), or can belong to different base stations / TRPs / cells / central units (CU) / distribution units (DU). For example, the network side sends 4 streams of data to the user, wherein the multiple resources under resource set 1 are associated with multiple antenna modules that adopt coherent joint transmission to send 2 streams of data, and the multiple resources under resource set 2 are also associated with multiple antenna modules that adopt coherent joint transmission to send another two streams of data, i.e., the multiple antenna modules associated between resource set 1 and resource set 2 adopt non-coherent joint transmission. It should be noted that for this scheme, the multiple antenna modules associated with the multiple CSI-RS resources under each resource set adopt coherent joint transmission or non-coherent joint transmission, which does not mean that all antenna modules associated with the CSI-RS resources under the resource set participate in coherent or non-coherent joint transmission, but can be at least one CSI-RS resource associated with the antenna module under the resource set. This configuration directly indicates the possible cooperation mode between the multiple antenna modules, which is beneficial to the calculation of terminal CSI. In addition, which cooperation mode is adopted by the multiple antenna modules within or between the resource sets can be indicated by the network side based on the UE capability reported by the terminal. UE capability, total number of supported CSI-RS resources.

[0216] Scheme three: under the CSI-RS resource configuration of scheme one and scheme two, a subset of CSI-RS resources is configured in the CSI-RS resource set, at least one CSI-RS resource is contained in each subset of CSI-RS resources, the number of antenna ports of the CSI-RS resources in the subset of CSI-RS resources can be the same or different, and the multiple CSI-RS resources in the subset of CSI-RS resources can adopt coherent joint transmission or non-coherent joint transmission, the same CSI-RS resource can belong to multiple subsets of CSI-RS resources at the same time, different subsets of CSI-RS resources are selected for transmission to achieve the purpose of reducing power consumption. For the CSI-RS resource configuration of scheme one and scheme two, from the perspective of energy saving, multiple antenna modules can not work at the same time, so as to achieve the purpose of reducing energy consumption. In this regard, a subset of CSI-RS resources can be configured in the CSI-RS resource set, at least one CSI-RS resource is contained in each subset of CSI-RS resources, the number of antenna ports of the CSI-RS resources in the subset of CSI-RS resources can be the same or different, and the multiple CSI-RS resources in the subset of CSI-RS resources can adopt coherent joint transmission or non-coherent joint transmission. It should be noted that if multiple subsets of CSI-RS resources are configured, the same CSI-RS resource can belong to multiple subsets of CSI-RS resources at the same time. For a terminal network, at least one CSI-RS resource or the CSI-RS resource under the CSI-RS resource subset can be used to send signals. Furthermore, the configured subset of CSI-RS resources can also be used to indicate the working mode of the antenna modules associated with multiple resources in the resource subset, and the antenna modules associated with multiple CSI-RS resources in the same subset adopt coherent or non-coherent joint transmission mode.

[0217] In addition, for the above-mentioned three schemes, if the antenna modules associated with multiple CSI-RS resources adopt coherent joint transmission mode, the multiple CSI-RS resources satisfy the condition of being located in the same time slot or adjacent multiple time slots, for example, 2. At the same time, for the above-mentioned schemes, the antenna modules corresponding to multiple CSI-RS resources under the same resource set, resource set subset, resource group or resource pair can adopt coherent joint transmission mode, and the multiple CSI-RS resources satisfy the condition of being located in the same time slot or adjacent multiple time slots, for example, 2. Furthermore, if the antenna modules associated with multiple CSI-RS resources adopt coherent joint transmission mode, and the multiple CSI-RS resources belong to different resource sets, resource set subsets, resource groups or resource pairs, the adjacent two CSI-RS resources under different resource sets, resource set subsets, resource groups or resource pairs can be located in the same time slot or adjacent two time slots.

[0218] Scheme four: one-to-many: at least one control center serving the same terminal configures a resource set for channel measurement, the resource set contains at least one resource for channel measurement, such as CSI-RS resource, the multiple channel measurement resources under the resource set can be further divided into multiple channel measurement resource groups, the number of channel measurement resources under each resource group can be the same or different, and the antenna ports corresponding to each resource can be the same or different. At least one base station / TRP / cell / central unit(CU) / distributed unit(DU) serving the same terminal configures a resource set for channel measurement, the resource set contains at least one resource for channel measurement, such as CSI-RS resource, the multiple channel measurement resources under the resource set can be further divided into multiple channel measurement resource groups, the number of channel measurement resources under each resource group can be the same or different, and the antenna ports corresponding to each resource can be the same or different, and the multiple antenna modules associated with the CSI-RS resources under each CSI-RS resource group can use coherent joint transmission or non-coherent joint transmission; and on this basis, the multiple antenna modules associated with multiple CSI-RS resource groups can also use coherent joint transmission or non-coherent joint transmission. The division of channel measurement resource groups can be performed according to the central control unit, and each central control unit corresponds to a CSI-RS resource group. In order to enable the terminal to better distinguish the number of resource groups, at least one of the following methods can be further used:

[0219] Method one: standard pre-defined method, the standard specifies that each resource group corresponds to at most X channel measurement resources, and the number of channel measurement resources contained in each group is the same, and the division of resource groups can be arranged in the order of resource number or selected according to a rule, which is not specifically restricted here, for example, if Y channel measurement resources are divided into 2 groups, then each group contains Y / 2 channel measurement resources, and the first Y / 2 resources with smaller resource numbers belong to one resource group, and the remaining resources belong to another resource group.

[0220] Method two: the central control unit indicates the number of resources contained in each resource group to the terminal, and the specific indication method can be RRC / MAC CE / DCI, for example, the central control unit indicates the number of resources contained in each resource group, and then the standard stipulates that the resources are grouped in the order of resource number.

[0221] Method three: the central control unit indicates to the terminal which resources are contained in each resource group, for example, the central control unit indicates which resources belong to a resource group through a resource group list, and the specific indication can be bitmap, combination number, or resource index, etc. No further constraints are made here.

[0222] Third technical problem: coherent / incoherent transmission cooperation cluster selection: for a distributed system composed of modular large-scale MIMO, multiple antenna arrays may adopt coherent / incoherent / partially coherent joint transmission, and the multiple antenna arrays may belong to the same control center or different control centers. Since the channels from different antenna arrays to the terminal may have large differences, the channel quality between some antenna modules and the terminal is poor, or there is a large phase deviation between antenna modules, which is not suitable for cooperative transmission, so it is necessary to consider how to select multiple antenna modules for coherent / incoherent / partially coherent joint transmission. Partially coherent joint transmission refers to that among multiple cooperative entities for cooperative transmission, some cooperative entities adopt coherent joint transmission for cooperative transmission, and then the remaining cooperative entities adopt incoherent joint transmission for transmission. For example, there are four cooperative entities, among which cooperative entities 1 and 2 adopt coherent joint transmission for data transmission, and then cooperative entities 3 and 4 adopt incoherent cooperation for data transmission. The seventh and eighth embodiments of the present application can solve the third technical problem.

[0223] Cooperative cluster selection (seventh and eighth embodiments):

[0224] The selection of the cooperative cluster is mainly aimed at the scene of single-DCI scheduling of multiple cooperative entities incoherent joint transmission, and the scene of partially coherent joint transmission of multiple cooperative entities; for this, the determination of the number of cooperative entities, the selection and indication of the cooperative entities may be involved. Partially coherent joint transmission refers to that among multiple cooperative entities for cooperative transmission, some cooperative entities adopt coherent joint transmission for cooperative transmission, and then the remaining cooperative entities adopt incoherent joint transmission for transmission. For example, there are four cooperative entities, among which cooperative entities 1 and 2 adopt coherent joint transmission for data transmission, and then cooperative entities 3 and 4 adopt incoherent cooperation for data transmission. For example, the number of cooperative entities can be indicated by the control center, can be selected and determined by the terminal, or can be jointly determined by both. Different determination methods correspond to different air interface signaling interactions; this scheme may affect the high-level parameter configuration, and the feedback of CSI feedback and cooperative cluster selection information.

[0225] Seventh embodiment: selection of cooperative entities:

[0226] In some embodiments of the application, the scheme of the seventh embodiment can be implemented in combination with the schemes of the first, second, third, fourth, fifth, sixth, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, and / or seventeenth embodiments, or can be implemented independently of the schemes of the first, second, third, fourth, fifth, sixth, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, and seventeenth embodiments. In some embodiments of the application, the schemes among multiple embodiments can be implemented in combination, or can be implemented independently.

[0227] In some embodiments of the application, the joint transmission method further comprises selection of a cooperative cluster. In some embodiments of the application, the selection of the cooperative cluster is based on a number of the cooperating entities, the number of the cooperating entities being configured by the cooperating entities. In some embodiments of the application, the selection of the cooperative cluster comprises that the UE selects the cooperating entities based on a predefined condition when the predefined condition is satisfied. In some embodiments of the application, the selection of the cooperative cluster comprises that the UE selects part or all of the cooperating entities from the number of the cooperating entities configured by the cooperating entities. In some embodiments of the application, the number of the cooperating entities is indicated by the cooperating entities, determined by the UE, or both. The number of the cooperating entities refers to the number of the cooperating entities. In some embodiments of the application, the selection of the cooperative cluster is based on selecting at least one antenna array / panel from multiple antenna arrays / panels connected to the same cooperating entity for signal transmission with the UE. In some embodiments of the application, finally only one cooperating entity communicates with the UE for the UE. In some embodiments of the application, the UE feeds back channel measurement results of channel measurement resources corresponding to multiple antenna arrays / panels, so that the cooperating entity selects one channel measurement result from the multiple channel measurement results fed back by the UE for transmission of downlink information. In some embodiments of the application, the selection of the cooperative cluster is based on selecting at least two antenna arrays / panels from multiple antenna arrays / panels connected to the same cooperating entity for coherent or non-coherent joint transmission of signals with the UE.

[0228] For example, in some embodiments of the present application, for a distributed MIMO system, one central control unit can be connected to multiple cooperating entities, and the multiple cooperating entities can be fully coherent, partially coherent, or fully incoherent; and the coherence relationship between the cooperating entities when transmitting signals can be determined by standard convention, network side, or terminal feedback. For example, a network side central control unit can be connected to N cooperating entities, for example, N = 4 or 8, depending on the terminal reporting capability, and there can be some cooperating entities between the N cooperating entities that meet the coherent transmission (multiple antenna subarrays form a larger antenna array according to the spacing between the antenna elements in the subarray, for example, the spacing between the antenna elements in the antenna subarray is half a wavelength, and the spacing between the antenna arrays is also half a wavelength), and it is also possible that multiple cooperating entities achieve coherent transmission through calibration. For this embodiment, the cooperation transmission between multiple antennas / panels is discussed as follows:

[0229] Case 1: At least one cooperating entity is selected from the multiple cooperating entities connected to the same control center for signal transmission with the terminal, and for the terminal, only one cooperating entity communicates with the terminal. At least one antenna array / panel is selected from the multiple antenna arrays / panels connected to the same control center for signal transmission with the terminal, and for the terminal, only one antenna array / panel communicates with the terminal.

[0230] For case 1, the embodiment further considers the following two cases:

[0231] Case 1.1: The terminal selects one cooperating entity from multiple cooperating entities and reports the selection result to the control center. For this scenario, the selection of cooperating entities can use at least one of the following schemes:

[0232] Scheme 1: The terminal receives signals sent from multiple cooperating entities, and the terminal determines the selected cooperating entity based on the measurement results of the signals, and informs the control center of the selected cooperating entity; for example, the terminal determines the selected antenna array by measuring the reference signal RSRP / RSRQ / SINR, and informs the control center of the selected cooperating entity. The specific informing method can be through the terminal reporting the index information of the channel measurement resource corresponding to the cooperating entity, similar to the CRI (CSI-RS resource indication) information in the NR standard.

[0233] Scheme two: the terminal receives the signals sent from multiple cooperating entities, and the terminal determines the selected cooperating entity based on the measurement results of the signals, and informs the control center of the selected cooperating entity. The selection of the cooperating entity can be based on a certain RSRP / RSRQ / SINR threshold value. Obviously, there can be multiple cooperating entities whose measurement values are greater than the threshold value. The cooperating entity with the largest measurement value greater than the threshold value can be selected, or the specific one of the multiple cooperating entities greater than the threshold value can not be restricted. The specific implementation depends on the terminal implementation behavior. Furthermore, the threshold value corresponding to the RSRP / RSRQ / SINR of the above-mentioned reference signal measurement can be configured in a standard agreed manner, or can be configured by the center control unit through RRC / MAC CE / DCI.

[0234] Case 1.2: In order to improve the pairing probability, the terminal can feed back the channel measurement results of multiple antenna arrays / panels corresponding to the channel measurement resources, and the center control unit selects one channel measurement result from the multiple channel measurement results fed back by the terminal for the transmission of downlink information. In order to improve the pairing probability, the terminal can feed back the channel measurement results of multiple cooperating entities corresponding to the channel measurement resources, and the center control unit selects one channel measurement result from the multiple channel measurement results fed back by the terminal for the transmission of downlink information. For this scenario, the selection of the cooperating entity can adopt at least one of the following schemes:

[0235] Scheme one: the center control unit configures at most N channel measurement resources for the terminal, and instructs the terminal to report the measurement results of M (M≤N) channel measurement resources. The specific M channel measurement resources reported by the terminal are determined by the terminal, and the indication information is reported to the center control unit.

[0236] Scheme two: the center control unit configures at most N channel measurement resources for the terminal, and instructs the terminal to report the measurement results of M (M≤N) channel measurement resources. Among them, the measurement results of K (K≤M) channel measurement resources must be reported, that is, the terminal needs to further select M-K channel measurement resources from the N-K channel measurement resources, and report the information of the selected channel measurement resources and the corresponding channel measurement results to the center control unit.

[0237] Scheme three: the center control unit configures at most N channel measurement resources for the terminal, and instructs the terminal to report the measurement results of M (M≤N) channel measurement resources. The specific M channel measurement resources reported by the terminal are determined by the control center, and the terminal reports the channel measurement results to the center control unit based on the indication of the control center.

[0238] Scheme four: the central control unit configures the terminal with at most N channel measurement resources, and the terminal decides to report the channel measurement results corresponding to M (M≤N) channel measurement resources to the central control unit, and indicates the central control unit which M channel measurement results it reports, and the value of M.

[0239] Scheme five: the central control unit configures the terminal with at most N channel measurement resources, and instructs the terminal to report the measurement results of at most M (M≤N) channel measurement resources, and the terminal decides to report the measurement results of Z (Z≤M) channel measurement resources, and reports the index information of the Z channel measurement resources to the central control unit.

[0240] Scheme six: the central control unit configures the terminal with at most N channel measurement resources, and instructs the terminal to report the measurement results of at most M (M≤N) channel measurement resources, and the measurement results corresponding to K (K≤M) channel measurement resources must be reported, and the terminal further selects Z-K channel measurement resources from the N-K channel measurement resources, and reports the selected channel measurement resource information and the corresponding channel measurement results to the central control unit.

[0241] The indication of the value of M / K or the index information of the M / K channel measurement resources in the above schemes can be statically configured by RRC, dynamically indicated by MAC CE, DCI, or other control information, or determined by a standard agreed manner, for example, the standard agrees that the channel measurement information corresponding to the K channel measurement resources with smaller index must be reported. Secondly, the terminal reports the M / Z channel measurement information, the index information of the M / Z channel measurement resources, or the index information of the M-K / Z-K channel measurement resources, which can be reported through the uplink control channel or the data channel, for example, through the UCI in 5G / 6G. The channel measurement information mentioned in the above scheme can be the CSI information in the 5G / 6G system, which may include at least one of PMI, CQI, RI, and LI. Furthermore, the reporting of the channel measurement information corresponding to the above channel measurement resources can be periodic, aperiodic, or semi-persistent. In addition, the calculation of the above channel measurement information can be based on any algorithm scheme, which is not restricted by this scheme, for example, it can be based on the CRI feedback in NR, or any one of the codebook schemes in Type-I to Type-II in Rel-15 to Rel-19, and the Type-II codebook scheme includes the traditional Type-II codebook scheme and the further enhanced scheme of the Type-II codebook. It needs to be further explained here that each cooperation entity is associated with at least one channel measurement resource.

[0242] Case 2: Coherent or non-coherent joint transmission of multiple antenna arrays from the same control center, that is, at least two antenna arrays / panels connected to the same control center are selected for coherent or non-coherent joint transmission of signals between the terminal. Coherent or non-coherent joint transmission of multiple antenna arrays from the same control center, that is, at least two cooperative entities connected to the same control center are selected for coherent or non-coherent joint transmission of signals between the terminal. For the above scenario, how to select among multiple cooperative entities, at least one of the following schemes can be used:

[0243] Scheme one: the center control unit configures channel measurement resources for the terminal, each antenna array corresponds to a channel measurement resource, such as the channel measurement resource configuration in embodiment one, multiple channel measurement resources are located in the same channel measurement resource set, the cooperative entities corresponding to the configured multiple channel measurement resources adopt coherent or non-coherent joint transmission mode, and the center control unit will issue indication information based on the terminal's reported capability (supporting coherent or non-coherent joint transmission of cooperative entities corresponding to a maximum number of channel measurement resources) to indicate that the terminal uses coherent or non-coherent joint transmission mode for cooperative entities corresponding to these channel measurement resources. The above indication information can be issued by at least one of RRC / MAC CE / DCI.

[0244] Scheme two: the central control unit configures channel measurement resources for the terminal, each antenna array corresponds to a channel measurement resource, such as the channel measurement resource configuration in embodiment one, multiple channel measurement resources are located in the same channel measurement resource set, and the terminal determines to select which channel measurement resource corresponding cooperative entity to participate in coherent or non-coherent joint transmission based on the channel measurement result of the configured channel measurement resource. For example, the central control unit configures N channel measurement resources, and the terminal selects M (M≤N) channel measurement resources from the configured N channel measurement resources, and the cooperative entity corresponding to the M channel measurement resources adopts coherent or non-coherent joint transmission; the determination of M value can be indicated by the central control unit, can be determined by the terminal side, or can be predefined by the standard; at the same time, the central control unit can also indicate that the number of the maximum channel measurement resource selected by the terminal cannot exceed a certain value X (M≤X≤N), or the value of X is agreed by the standard, which depends on the capability item reported by the terminal, for example, the terminal reports that the value of X is 4 or 8; in the above scheme, if the value of M is indicated by the central control unit, the specific indication method can be at least one of RRC / MAC CE / DCI. If it is selected by the terminal, the terminal needs to report the indication information of the value of M; furthermore, the determination of the value of M needs to select M channel measurement resources from N channel measurement resources, and tell the central control unit which M channel measurement resources are finally selected; at the same time, the terminal also needs to report the channel measurement information corresponding to the M channel measurement resources; the reporting of channel measurement information can be jointly reported by all resources, or the channel measurement information corresponding to each resource can be independently reported; in addition, the terminal selects which M channel measurement resources, the indication information of which can be reported by using bitmap, that is, N bits are needed to indicate that the bit position of 0 / 1 indicates that the corresponding channel measurement resource is selected; or the combination number can be reported, that is, M channel measurement resources are selected from N channel measurement resources, and the bit overhead required is Each channel measurement resource can also be indicated and reported separately, that is, the CRI in the existing standard is used for reporting, and the bit overhead required is Of course, at least one of the above-mentioned multiple reporting methods can be used, for example, according to the value of M (for example, M is compared with a certain threshold value), which determines which one of the reporting methods is selected, so as to achieve the purpose of reducing the bit overhead of reporting.

[0245] Scheme three: the central control unit configures the terminal with channel measurement resources, each antenna array corresponds to a channel measurement resource, such as the channel measurement resource configuration in embodiment one, multiple channel measurement resources are located in the same channel measurement resource set, and the mapping relationship between the channel measurement resource and the cooperative entity participating in coherent or non-coherent joint transmission is determined by the central control unit and the terminal; the central control unit configures N channel measurement resources, and specifies that M (M≤N) channel measurement resources correspond to the cooperative entities that adopt coherent or non-coherent joint transmission, the value of M can also be standard agreed, and specifies that K (K≤X) channel measurement resources correspond to the cooperative entities that adopt coherent or non-coherent joint transmission, the specific K channel measurement resources can be agreed by standard (for example, the first K channel measurement resources with smaller indexes), and then the terminal further selects Y (Y+K≤X) channel measurement resources corresponding to the cooperative entities participating in coherent or non-coherent joint transmission based on the above indication information, the value of Y is determined by the terminal, or the value of Y is M-K. Furthermore, for the determination of the K channel measurement resources, in addition to the indication of the central control unit, the K channel measurement resources can also be determined by standard agreement (for example, the first K channel measurement resources with smaller indexes), or the central control unit indicates the value of K, and the specific K channel measurement resources can be agreed by standard (for example, the first K channel measurement resources with smaller indexes). Furthermore, the central control unit can also indicate that the maximum X (M≤X≤N) channel measurement resources correspond to the cooperative entities that adopt coherent or non-coherent joint transmission based on the capability reported by the terminal, and of course the value of X can also be standard agreed. The values of X / M / K under this scheme can be indicated by RRC / MAC CE / DCI.

[0246] For the above-mentioned scheme, for coherent joint transmission, the terminal actually does not need to know the mapping relationship between the channel measurement resource and the cooperative entity, but the standard needs to clearly define the mapping relationship between the antenna port and the PMI of different channel measurement resources (borrowing from Rel-19), the antenna port index can be sequentially increased according to the index order of the channel measurement resource, for example, 4 channel measurement resources are configured, 3 of which correspond to the cooperative entities participating in coherent joint transmission, the first channel measurement resource corresponds to P1 antenna ports, the second channel measurement resource corresponds to P2 antenna ports, and the third channel measurement resource corresponds to P3 antenna ports, the total number of antenna ports is P1+P2+P3, and the antenna port index corresponding to the first channel measurement resource is 1~P1, the antenna port index corresponding to the second channel measurement resource is P1+1~P1+P2, and the antenna port index corresponding to the third channel measurement resource is P1+P2+1~P1+P2+P3.

[0247] In addition, the values of N / M / K in the above scheme, and the value of Z are all dependent on the capability report of the terminal; for example, N.

[0248] Eighth embodiment: selection of cooperating entities (multi-CU), divided into two modes: single DCI and multi-DCI configuration

[0249] In some embodiments of the present application, the solution of the eighth embodiment can be implemented in combination with the solutions of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the solutions of the first embodiment, the second embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the solutions among multiple embodiments can be implemented in combination or independently.

[0250] For example, in some embodiments of the present application, for a distributed MIMO system, one central control unit can be connected to multiple cooperating entities, and the multiple cooperating entities can be fully coherent, partially coherent, or fully incoherent; and the coherence relationship between the cooperating entities when transmitting and receiving signals can be standard agreed, determined by the network side, or fed back by the terminal. For example, a central control unit of the network side can be connected to N cooperating entities, and some of the N cooperating entities can be fixed to meet coherent transmission (multiple antenna subarrays form a larger antenna array according to the spacing between the antenna elements in the subarray, for example, the spacing between the antenna elements in the antenna subarray is half a wavelength, and the spacing between the antenna arrays is also half a wavelength), and the multiple cooperating entities can also achieve coherent transmission through calibration. This embodiment mainly discusses the selection of cooperating entities when multiple control centers correspond to coherent / incoherent joint transmission of antenna arrays, and discusses the following cases:

[0251] Case 1: The cooperating entities corresponding to multiple control centers use coherent / incoherent joint transmission, which can be further divided into the following scenarios according to the channel measurement resource configuration according to embodiment one:

[0252] Case 1.1: All channel measurement resources belong to one resource set, which contains at least one channel measurement resource, and each channel measurement resource corresponds to one cooperating entity. The terminal determines to feed back the channel information corresponding to those channel measurement resources based on the configuration of the control center. The specific solution is the same as the three solutions of case 2 in embodiment two.

[0253] Case 1.2: Each control center corresponds to a set of measurement resources, each set contains at least one channel measurement resource, each channel resource corresponds to a cooperative entity, and the selection of which channel measurement resources corresponding to the antenna array participating in coherent / non-coherent joint transmission can adopt at least one of the following schemes:

[0254] Assume that the control center configures the terminal with N sets of channel measurement resources, and each set contains K1, K2,..., K N , respectively. , which can be the same or different, and the standard may constrain K n to be less than a certain value (e.g., K n ≤ 2 or 4), or the standard constrains to be less than a certain value (e.g. or 12 or 16), or the standard constrains N to be less than a certain value (e.g., N ≤ 4 or 6 or 8), and M channel measurement resources participate in cooperative transmission. Based on the above information, the specific scheme is as follows:

[0255] Scheme 1: The value of M can be configured by the control center, and the configuration method can be RRC / MAC CE / DCI, or the number of M is selected by the terminal, in which case the terminal needs to report the number of selected resources M, or the value of M is predefined by the standard.

[0256] Scheme 2: The control center indicates that the maximum number of cooperative entities participating in cooperation is K , or the standard stipulates that the maximum number of cooperative entities participating in cooperation is K , and the number of M is selected by the terminal, in which case the terminal needs to report the number of selected resources M.

[0257] For schemes 1 and 2, the terminal selects M channel measurement resources from N sets of measurement channel resources based on the configuration of the control center, and reports the corresponding channel state information based on the measurement results of the M channel measurement resources; at the same time, the terminal needs to report which M channel measurement resources, and the specific indication method can be , in which case the index of the channel measurement resource needs to be jointly numbered all measurement resources in the N sets of channel measurement resources, for example, each measurement resource is numbered in order according to the order of the channel measurement resource set, the resource index corresponding to the first resource in the first resource set is 1, and then the resource index in the resource set is incremented by K1, the resource index corresponding to the first resource in the nth>1 resource set is Secondly, the bitmap method can also be used, which requires bits, or can also be indicated in a similar way to the resource index of CRI, for example, each resource is indicated by bits.

[0258] Scheme three: the value of M can be configured by the control center, the configuration method can be RRC / MAC CE / DCI, or the number of M is selected by the terminal, at this time the terminal needs to report the number of selected resources M, or the value of M is predefined by the standard. At the same time, the control center can also indicate that the terminal must report the channel state information measured by which resources, for example, the control center indicates that the cooperation entity corresponding to Z (for example, Z≤M) channel measurement resources participates in cooperation, and then the terminal selects M-Z channel measurement resources corresponding to the antenna array from resources to participate in cooperation; in addition, the cooperation entity corresponding to the Z channel measurement resources participating in cooperation can also be agreed by the standard, for example, the standard agrees that the cooperation entity corresponding to the first Y (resource index smaller / larger Y) resources in each resource set participates in cooperation, for example, Y=1, or the standard agrees that the cooperation entity corresponding to the first X (resource index smaller / larger X) resources in the first resource set participates in cooperation.

[0259] Scheme four: the control center indicates that the maximum number of channel measurement resources (in fact, each resource corresponds to a specific cooperation entity) participating in cooperation is K (K≤N), or the standard agrees that the maximum number of channel measurement resources participating in cooperation is K (K≤N), and the number of M is selected by the terminal, at this time the terminal needs to report the number of selected resources M. At the same time, the control center can also indicate that the terminal must report the channel state information measured by which resources, for example, the control center indicates that the cooperation entity corresponding to Z (for example, Z≤M) channel measurement resources participates in cooperation; in addition, the cooperation entity corresponding to the Z channel measurement resources participating in cooperation can also be agreed by the standard; then on the basis of the above, the terminal selects M-Z channel measurement resources corresponding to the antenna array from resources to participate in cooperation. For example, the control center specifies or the standard agrees that the cooperation entity corresponding to the fixed resource index (for example, the Lth resource index, or the first L resource indexes, L=1 or 2) in each resource set participates in cooperation, or the control center specifies or the standard agrees that the cooperation entity corresponding to the first X smaller resource indexes in the first resource set participates in cooperation.

[0260] For scheme three and scheme four, the terminal selects M-Z channel measurement resources from resources based on the configuration of the control center, and reports the corresponding channel state information based on the measurement results of the M channel measurement resources; at the same time, the terminal needs to report which M channel measurement resources, and the specific indication method can be At this time, the index of the channel measurement resource needs to jointly number all the measurement resources in the N channel measurement resource sets, for example, sequentially numbering each measurement resource according to the order of the channel measurement resource sets, the resource index corresponding to the first resource in the first resource set is 1, then the resource index corresponding to the first resource in the nth resource set is Secondly, the bitmap mode can also be used, a total of bits are required, or the resource index mode similar to CRI can also be used for indication, for example, each resource is indicated by bits.

[0261] Furthermore, for the terminal selection and final determination of the M resources corresponding to the cooperative entity participating in cooperation in the above-mentioned scheme, the terminal can also not explicitly report the value of M, but can be inferred through other indication information, for example, through bitmap indication information or CRI bit overhead information; in addition, if M = K, the terminal can default to report the indication information of the value of M, and if M = Z, the terminal can also default to report the indication information of the value of M.

[0262] Case 2: Each control center corresponds to a resource set or resource group, and multiple resource groups belong to the same resource set, the antenna arrays corresponding to multiple resources under the same resource set or resource group use coherent joint transmission, and the antenna arrays corresponding to multiple resources under different resource sets or resource groups use non-coherent joint transmission; for this control center or terminal, it can be necessary to select the resources participating in cooperation for each resource set or resource group, and to select the resource sets or resource groups participating in cooperation for different resource sets or resource groups. The specific scheme can be at least one of the following:

[0263] First, the standard can be configured as follows, assuming that the control center configures N channel measurement resource sets for the terminal, where R (R ≤ N) resource sets participate in non-coherent cooperative transmission, and the number of channel measurement resources included in each channel measurement resource set is K1, K2,..., K N , where may be the same or different, and the standard can constrain K n cannot exceed a certain value (for example, K n ≤ 2 or 4), or the standard can constrain cannot exceed a certain value (for example, or 12 or 16), or the standard can constrain N cannot exceed a certain value (for example, N ≤ 4 or 6 or 8). Based on the above information, the specific scheme is as follows:

[0264] Scheme one: the standard restricts the antenna array corresponding to multiple channel measurement resources under the same resource set to use coherent joint transmission. The terminal needs to select which R resource sets to participate in non-coherent cooperative transmission. The value of R can be configured by the control center, and the configuration method can be RRC / MAC CE / DCI, or the number of R is selected by the terminal, in which case the terminal needs to report the selected number of resources R, or the value of R is predefined by the standard.

[0265] Scheme two: the standard restricts the antenna array corresponding to multiple channel measurement resources under the same resource set to use coherent joint transmission. The control center indicates that the maximum number of resource sets participating in non-coherent cooperation is K (K≤N), or the standard stipulates that the maximum number of resource sets participating in non-coherent cooperation is K (K≤N). The number of R is selected by the terminal, in which case the terminal needs to report the selected number of resource sets M.

[0266] For scheme one and scheme two, the terminal selects M channel measurement resource sets from N measurement channel resource sets based on the configuration of the control center, and reports the corresponding channel state information based on the measurement results of the M channel measurement resource sets. At the same time, the terminal needs to report which M channel measurement resource sets, and the specific indication method can be Secondly, the bitmap method can also be used, which requires N bits, or the resource index method similar to CRI can also be used for indication, which indicates the resource set, for example, each resource set is indicated by bits.

[0267] Scheme three: the value of R can be configured by the control center, and the configuration method can be RRC / MAC CE / DCI, or the number of R is selected by the terminal, in which case the terminal needs to report the selected number of resources R, or the value of R is predefined by the standard. At the same time, the control center can also indicate which measurement resource sets the terminal must participate in cooperation, and the corresponding channel measurement information must be reported, for example, the control center indicates that Z channel measurement resource sets (for example, Z≤R) corresponding to cooperative entities participate in cooperation, then the terminal selects R-Z resource sets from N-Z resource sets, and the corresponding antenna array participates in cooperation; Furthermore, the Z channel measurement resource sets corresponding to the cooperative entities participating in cooperation can also be stipulated by the standard, for example, the standard stipulates that the first Y resource sets (resource set index smaller / larger Y) corresponding to the cooperative entities participate in cooperation, for example, Y=1, or the standard stipulates that a certain resource set(s) (for example, the first resource set) corresponding to the cooperative entities participates in cooperation.

[0268] Scheme four: the control center indicates the maximum number of channel measurement resource sets participating in cooperation (each channel measurement resource set corresponds to at least one cooperative entity of a control center unit), which is maximum K (K≤N), or the standard agrees that the maximum number of channel measurement resource sets participating in cooperation is maximum K (K≤N), and the number of R is selected by the terminal, so the terminal needs to report the number of selected resource sets. At the same time, the control center may also indicate that the channel state information measured by the terminal on which resource sets must be reported, for example, the control center indicates that Z (for example, Z≤R) channel measurement resource sets correspond to cooperative entities participating in cooperation; in addition, the Z channel measurement resource sets corresponding to the cooperative entities participating in cooperation can also be standard agreed; then the terminal selects R-Z resource sets corresponding to the cooperative entities participating in cooperation from N-Z resource sets on the basis of the above. For example, the control center specifies or standard agrees that one or more measurement resource sets (for example, the first resource index set or the Z measurement resource sets with smaller indexes) correspond to cooperative entities participating in cooperation.

[0269] For scheme three and scheme four, the terminal selects R-Z channel measurement resource sets from N-Z measurement channel resource sets based on the configuration of the control center, and reports the corresponding channel state information based on the measurement results of the R channel measurement resource sets; at the same time, the terminal needs to report which R channel measurement resource sets, and the specific indication method can be Secondly, bitmap can also be used, a total of N-Z bits are required, or a similar CRI resource index method can also be used for indication, which indicates the resource set, for example, each resource set is indicated by bits.

[0270] In addition, for the above scheme involving the terminal selecting and finally determining the cooperative entities corresponding to the R resource sets participating in cooperation, the terminal can also not explicitly report the value of R, which can be inferred from other indication information, such as bitmap indication information or resource set indication bit overhead information; in addition, if R=K, the terminal can default to report the indication information of the value of R, and if R=Z, the terminal can also default to report the indication information of the value of R.

[0271] In addition, the above scheme for resource sets is also applicable to the configuration method of resource groups, that is, multiple resource groups are configured under a resource set, the cooperative entities corresponding to the resources in the resource group adopt coherent joint transmission, and the cooperative entities corresponding to the resources between the resource groups adopt non-coherent joint transmission.

[0272] The fourth technical problem is: TCI state activation indication in single-DCI multi-cooperation entity non-coherent cooperation. In the existing NR system, non-coherent cooperation transmission of a maximum of two TRPs is supported, and the two TRPs correspond to one TCI state respectively. The TCI state is determined in three steps: first, a plurality of TCI states are configured through RRC; second, a plurality of TCI state groups are activated through MAC CE; and finally, a corresponding TCI state group is selected from the activated plurality of TCI state groups through the TCI information indication field in the DCI. Each TCI state group contains two TCI states. If non-coherent cooperation transmission of a maximum of N (N>2) cooperation entities is supported, each cooperation entity can correspond to one TCI state. The existing standard cannot meet the above scenario, and a corresponding TCI state activation indication scheme needs to be designed. The ninth embodiment of the present application can solve the fourth technical problem.

[0273] TCI state indication (ninth embodiment):

[0274] The current NR standard supports non-coherent transmission of two cooperating TRPs, and each TRP corresponds to one TCI state. Some embodiments of the present application consider supporting non-coherent joint transmission of more cooperation entities, and the activation and indication of the TCI state need to be adapted accordingly. Some embodiments of the present application propose that the MAC CE can activate a TCI state group containing more TCI states, and more TCI states can be selected simultaneously in combination with the DCI indication and the standard predefined manner, thereby supporting non-coherent joint transmission of more cooperation entities. This scheme can affect the indication of TCI state information and the activation configuration of MAC CE.

[0275] Ninth embodiment: TCI state indication under single-DCI scheme:

[0276] In some embodiments of the present application, the scheme of the ninth embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment. In some embodiments of the present application, the schemes of multiple embodiments can be implemented in combination or independently.

[0277] In some embodiments of the application, the joint transmission method further comprises receiving an indication of the TCI state from the cooperating entity. In some embodiments of the application, a TCI state group containing multiple TCI states is activated by a MAC CE. In some embodiments of the application, the MAC CE activates up to 8 TCI state groups, and each TCI state group contains one to N TCI states. In some embodiments of the application, when the number of cooperating cooperating entities is greater than two, two TCI information indication fields are configured. In some embodiments of the application, the MAC CE activates up to K TCI state groups, each containing one to two TCI states, and the TCI state used by the PDSCH is indicated by the DCI, and when the number of cooperating cooperating entities is greater than two, the TCI information indication field indicates at least one TCI state group. In some embodiments of the application, when the number of cooperating cooperating entities is greater than one, the Y TCI states with the smallest TCI state ID number are activated by the MAC CE, and Y is the number of actual cooperating cooperating entities. In some embodiments of the application, the number of cooperating cooperating entities is configured by an RRC parameter, or the number of cooperating cooperating entities is predefined. In some embodiments of the application, multiple TCI states are selected by DCI indication and predefined methods.

[0278] In the existing NR system, non-coherent cooperative transmission of up to 2 TRPs is supported, and each of the two TRPs corresponds to one TCI state, and in the case of single DCI, the two TCI states are indicated by the TCI information field in the DCI. If non-coherent cooperative transmission of up to N (N>2) cooperating entities is supported, each cooperating entity may correspond to one TCI state, and the existing standard cannot meet the above scenario. For example, in some embodiments of the application, the embodiments are directed to non-coherent cooperative transmission of up to N cooperating entities, for example N=4, and at least one of the following TCI state indication schemes is proposed. The specific standardized scheme can be at least one of the following schemes:

[0279] It is assumed that a set of TCI state index values is configured in RRC signaling, and the set contains up to M TCI states, for example M=128.

[0280] Scheme one: up to K TCI state groups are activated by a MAC CE, for example K=8, and each TCI state group contains one to N TCI states, and the configuration of the specific MAC CE signaling can use at least one of the following ways, where R represents a reserved bit.

[0281] Method one: as shown in Table two, C kIndicates whether multiple TCI states are included in the kth TCI state group activated by the MAC CE, 0 indicates not included, 1 indicates included; the specific number of included can be determined by RRC configuration or standard pre-defined manner (compatibility problem), and the states included in each state group in the K TCI state groups activated by the MAC CE can be the same or different.

[0282] Table II: C k Indicates whether multiple TCI states are included in the kth TCI state group activated by the MAC CE:

[0283] Method two: as in Table III, C kn Indicates whether the n+1th TCI state in the kth TCI state group belongs to the TCI group, 0 indicates not belonging, 1 indicates belonging, and the states included in each state group in the K TCI state groups activated by the MAC CE can be the same or different; Furthermore, the specific number of included in each TCI state group can be determined by RRC configuration or standard pre-defined manner (compatibility problem).

[0284] Table III: C kn Indicates whether the n+1th TCI state in the kth TCI state group belongs to the TCI group:

[0285] For the above scheme, which TCI state group is finally used for PDSCH can be indicated by DCI, for example, by the TCI information field in the DCI, and the specific indication overhead is If the number of TCI groups activated by the MAC CE is less than K, which TCI state group is used for PDSCH is determined according to the value actually indicated by the TCI information field in the DCI, for example, the maximum of 8 TCI state groups is activated by the MAC CE, and 4 TCI state groups are actually activated, then 3 bits in the DCI are used to indicate which TCI state group is used for PDSCH, if 000 is corresponding to 3 bits, the first TCI state group is used for PDSCH.

[0286] Scheme two: the maximum of K TCI state groups is activated by the MAC CE, and 1 to 2 TCI states are included in each TCI state group, and the specific MAC CE signaling configuration can adopt the existing configuration manner of NR, and the TCI state used for PDSCH is indicated by the DCI, and a second TCI information indication field is configured when the number of cooperating cooperative entities is greater than 2, and the bit overhead of the information indication field is Or The number of TCI states contained in each group of the MAC CE activated TCI group can be the same or different. Furthermore, the TCI information indication field under DCI can also adopt the representation of the combination number X represents the number of actually activated TCI state groups, and Y represents the number of selected TCI state groups. Y can take a value of 1 or 2. In addition, the indication can also be performed by a bitmap. The bit indication overhead is K or the number of actually activated TCI state groups. The bit of the bitmap is 0, indicating that the TCI state group is not selected, and the bit is 1, indicating that the TCI state group is selected.

[0287] Scheme three: the MAC CE activates a maximum of K TCI state groups, and each TCI state group contains 1 to 2 TCI states. The specific MAC CE signaling configuration can adopt the existing configuration manner of NR. The TCI state used by PDSCH is indicated by DCI. The specific indication overhead is When the number of cooperative cooperative entities is greater than 2, the TCI information indication field can indicate at least one TCI state group, for example, two consecutive TCI state groups can be indicated. Each state group can contain 1 to 2 TCI states. The specific indication of which TCI state group can be determined according to a certain mapping rule, for example, two consecutive TCI state groups are indicated by a standard predefined manner. For example, K = 8, and 3 bits are used for indication. If the 3 bits are 000, the first and second TCI state groups are selected.

[0288] The above-mentioned schemes one to three, when the DCI schedules the PDSCH transmission, only when the time interval between the DCI and the scheduled PDSCH is greater than a threshold, the UE can complete the decoding of the DCI, read the TCI state containing the QCL relationship indicated by the base station, and receive the PDSCH by using the corresponding receiving beam. However, when the time interval between the DCI and the scheduled PDSCH does not satisfy the time interval constraint, the UE cannot complete the decoding of the DCI, or has completed the decoding but cannot switch to the indicated beam to receive the PDSCH in time, or the DCI does not contain the TCI information indication field. At least one of the following schemes can be used to determine how the UE receives the PDSCH information.

[0289] Scheme four: MAC CE activates up to K TCI state groups, each of which contains 1 to 2 TCI states, and the specific MAC CE signaling configuration can adopt the existing configuration mode of NR. When the number of cooperating entities is greater than 1, the Y TCI states with the smallest TCI state ID number activated by the default MAC CE are used, or the Y TCI states with smaller indexes activated by the MAC CE are used, Y is the number of actual participating cooperating entities; or the TCI state group with smaller indexes activated by the MAC CE is used, which contains Y TCI states; or when the number of cooperating entities is greater than 2, the two TCI state groups with smaller indexes activated by the MAC CE are used, each of which contains at least one TCI state. When the total number of TCI states is greater than Y, the corresponding TCI states are selected according to the TCI state indexes from small to large, for example, two TCI state groups with indexes 0 and 1 activated by the MAC CE are used, each of which contains 2 TCI states, and the actual number of cooperating entities is 3. The default two TCI states in the first state group and the first TCI state in the second TCI state group are selected. When the number of cooperating entities is greater than 1, the Y TCI states with the smallest TCI state ID number activated by the default MAC CE are used. Directly configured by RRC, and determined by the standard constraint mode.

[0290] In addition, for the above-mentioned scheme, a single cooperating entity can be at least one antenna array corresponding to a single channel measurement resource; can be at least one antenna array corresponding to a channel measurement resource group; can be at least one antenna array corresponding to a channel measurement resource set; can be a channel measurement resource, a channel measurement resource group, or a channel measurement resource set corresponding to an antenna array participating in cooperation; or a TRP, a base station, a cell, a control center, a PA, an antenna panel.

[0291] The fifth technical problem is the layer group allocation and indication when multiple cooperating entities use the SDM multiplexing mode. The existing NR standard supports a maximum of two TRPs for cooperation in non-coherent transmission. With the increasing processing capacity of terminals and base stations, some embodiments of the present application consider supporting non-coherent cooperative transmission of a maximum of N cooperating entities, for example, N = 4. For this, if different cooperating entities use the SDM mode for non-coherent cooperative transmission, the layer group corresponding to the transmission of different cooperating entities needs to be considered, as well as the specific indication mode. In the existing standard, the layer group carried by the cooperating TRP is determined by the DMRS indication. For non-coherent cooperative transmission of a maximum of 4 cooperating entities, how to indicate the layer group of the cooperating entity transmission of the terminal according to the allocation of the DMRS port. The tenth embodiment of the present application can solve the fifth technical problem.

[0292] Allocation of the number of cooperation streams (tenth embodiment):

[0293] Since more cooperation entities are supported for joint transmission, and different cooperation entities can carry part of the layers in all PDSCH data, the allocation of the layers carried by different cooperation entities and how to specifically indicate the terminal are problems considered by some embodiments of the present application. Some embodiments of the present application propose specific allocation modes of the number of streams and specific indication modes of different allocation modes. This scheme mainly affects the configuration of downlink scheduling information, i.e., the indication information of DCI.

[0294] Tenth embodiment: allocation of the number of streams supported in non-coherent cooperation

[0295] In some embodiments of the present application, the scheme of the tenth embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment. In some embodiments of the present application, the schemes of multiple embodiments can be implemented in combination or independently.

[0296] In some embodiments of the present application, the joint transmission method further comprises receiving configuration information of the number of cooperating streams from the cooperating entity. In some embodiments of the present application, the number of cooperating entities and the number of streams transmitted by each cooperating entity are indicated by the cooperating entity. In some embodiments of the present application, the number of cooperating entities is indicated by the cooperating entity, and the number of streams transmitted by each cooperating entity is predefined. In some embodiments of the present application, the number of cooperating entities and the number of stream configurations transmitted by cooperating entities are indicated by the cooperating entity, and the actual number of stream configurations transmitted by cooperating entities is determined by the UE and fed back. In some embodiments of the present application, the number of cooperating entities is indicated by the cooperating entity, and the number of stream configurations transmitted by cooperating entities is predefined, and the actual number of stream configurations transmitted by cooperating entities is determined by the UE and fed back. In some embodiments of the present application, the number of cooperating entities is indicated by the cooperating entity, and the number of streams transmitted by each cooperating entity is determined by the UE and fed back. In some embodiments of the present application, the number of cooperating entities and the number of stream configurations transmitted by cooperating entities are indicated by the cooperating entity, and the actual number of stream configurations transmitted by cooperating entities is determined by the cooperating entity and indicated. In some embodiments of the present application, the number of stream configurations transmitted by cooperating entities is indicated by the cooperating entity through RRC parameters, and the actual number of stream configurations transmitted by cooperating entities is indicated by the cooperating entity through MAC CE or DCI. In some embodiments of the present application, the number of cooperating entities is indicated by the cooperating entity, or is predefined, or is selected by the UE, or is determined jointly by the cooperating entity and the UE.

[0297] For non-coherent cooperative transmission, the central control unit participating in cooperation may only transmit one or more streams in the total number of streams, and each antenna array may also only transmit one or more streams in the total number of streams. Under the condition that the maximum number of transmission streams L supported by the terminal is determined, the specific allocation of the number of streams may adopt at least one of the following schemes:

[0298] The actual number of transmitted streams is X streams, the number of cooperating entities participating in cooperative transmission is at least 1 and at most Y, the value of Y can be predefined by the standard, and the number of cooperating entities participating in cooperation is Z, and satisfies where 1≤Y≤X, Z≤Y, K x is the number of streams transmitted by the xth cooperating entity, K x is a positive integer.

[0299] Scheme one: the control center indicates the number of cooperating entities participating in cooperation and the number of streams transmitted by each cooperating entity.

[0300] Scheme two: the control center indicates the number of cooperative entities, and the standard predefines the number of streams transmitted by each cooperative entity.

[0301] Scheme three: the control center indicates the number of cooperative entities, and indicates multiple sets of possible stream number configurations transmitted by the cooperative entities, and the terminal determines and feeds back which set to use.

[0302] Scheme four: the control center indicates the number of cooperative entities, and the standard predefines multiple sets of possible stream number configurations transmitted by the cooperative entities, and the terminal determines and feeds back which set to use.

[0303] Scheme five: the control center indicates the number of cooperative entities, and the terminal determines and feeds back the number of streams transmitted by each cooperative entity to the control center.

[0304] Scheme six: the control center indicates the number of cooperative entities, and indicates multiple sets of possible stream number configurations transmitted by the cooperative entities, and the control center determines and indicates which set to use; for example, the control center configures multiple sets of possible stream number configurations transmitted by the cooperative entities through RRC, and indicates which set to use through MAC CE or DCI.

[0305] Furthermore, the number of cooperative entities described above can be indicated by the control center, pre-defined by the standard, selected by the terminal, or determined jointly by the control center and the terminal.

[0306] Based on the above possible schemes, this embodiment assumes that the maximum number of cooperative entities participating in cooperation is Y=4, and the maximum number of streams transmitted is X=8, and the number of streams transmitted by each cooperative entity satisfies at least one of where Z is the number of cooperative entities actually participating in cooperation, Z can be at least one of {1, 2, 3, 4}, K xThe number of streams transmitted by the xth cooperative entity; for example, if the actual number of transmitted streams is 4 streams, then the number of cooperative entities participating in non-coherent transmission is at least 1, if the number of cooperative entities participating in non-coherent transmission is 1, then the cooperative entity transmits 4 streams; if the number of cooperative entities participating in non-coherent transmission is 2, then the number of streams transmitted by the two cooperative entities can be at least one of {2+2, 3+1, 1+3}; if the number of cooperative entities participating in non-coherent transmission is 3, then the number of streams transmitted by the three cooperative entities can be at least one of {1+1+2, 1+2+1, 2+1+1}; if the number of cooperative entities participating in non-coherent transmission is 4, then each cooperative entity transmits 1 stream; further, if the actual number of transmitted streams is 8 streams, then the number of cooperative entities participating in non-coherent transmission is at least 1, if the number of cooperative entities participating in non-coherent transmission is 1, then the cooperative entity transmits 8 streams; if the number of cooperative entities participating in non-coherent transmission is 2, then the number of streams transmitted by the two cooperative entities can be at least one of {4+4, 3+5, 5+3, 2+6, 6+2, 1+7, 7+1}; if the number of cooperative entities participating in non-coherent transmission is 3, then the number of streams transmitted by the three cooperative entities can be at least one of {4+2+2, 2+4+2, 2+2+4, 3+3+2, 3+2+3, 2+3+3, 4+1+3, 1+4+3, 3+1+4}; if the number of cooperative entities participating in non-coherent transmission is 4, then each cooperative entity transmits 1 stream.

[0307] The above scheme is applicable to the NR system, and also applicable to the next generation 6G or 7G system, so the configuration of the number of cooperative entities, the number of streams corresponding to each cooperative entity, and the multiple possible configurations of the number of streams transmitted by the cooperative entities in the above scheme can be configured by the RRC / MAC CE / DCI of the NR system, or by some control or data signals in the 6G / 7G system, such as the RRC / MAC CE / DCI of the 6G / 7G system.

[0308] Further, the number of cooperative entities reported by the terminal, the number of streams corresponding to each cooperative entity, or the selected predefined configuration of the number of streams transmitted by the cooperative entities mentioned in the above scheme can be reported by the uplink control information of the NR, carried in the PUCCH and / or PUSCH channel, or can be reported by some control or data signals in the 6G / 7G system, such as by the uplink control information of the 6G / 7G system, carried in the PUCCH and / or PUSCH channel of the 6G or 7G system.

[0309] In addition, for the above scheme, a single cooperation entity can be at least one antenna array corresponding to a single channel measurement resource; can be at least one antenna array corresponding to a channel measurement resource group; can be at least one antenna array corresponding to a channel measurement resource set; can refer to a channel measurement resource, a channel measurement resource group, or a channel measurement resource set corresponding to an antenna array participating in cooperation; can be a TRP, a base station, a cell, a control center, a PA, an antenna panel; for the control center mentioned in the above scheme, it can be a base station, a CU, a DU, and can also refer to the network side.

[0310] The second solution is multi-DCI multi-cooperation entity transmission enhancement.

[0311] Figure 10A is the main air interface interaction flow in the case of multi-DCI scheduling two cooperation entities, and some embodiments of the present application consider the scenario of multi-DCI scheduling more cooperation entities (greater than or equal to 2) for cooperation transmission. The number of cooperation entities specifically supported can be reported as the capability of the terminal, for example, the terminal reports that it supports N = 2, 3, or 4 cooperation entities for cooperation; The design of the specific scheme involves TCI state indication, HARQ feedback, configuration of BWP CORESET, PDSCH configuration, and other issues. Some embodiments of the present application mainly provide specific solutions for the following aspects.

[0312] Figure 10B is a flowchart of a joint transmission method provided by an embodiment of the present application, which is executed on a user equipment (UE). The method includes at least one of the following operations: operation 701B: reporting a UE capability to a cooperation entity. The UE capability supports multi-cooperation entity cooperation enhancement, which is applied to a scenario of multi-DCI scheduling multi-cooperation entity cooperation transmission, the number of the multi-cooperation entities is greater than or equal to 2, and the number of the multi-cooperation entities is a capability item of the UE capability; operation 702B: based on the multi-DCI scheduling multi-cooperation entity cooperation transmission, the UE feeds back information to at least one of the cooperation entities. The feedback information is, for example, CSI feedback information and / or HARQ feedback information.

[0313] By the technical solution, the UE reports UE capability to a cooperation entity, the UE capability supports multi-cooperation entity cooperation enhancement, and the multi-cooperation entity cooperation enhancement is applied to a scenario of multi-downlink control information (DCI) scheduling multi-cooperation entity cooperation transmission. In this way, the UE can support coherent cooperation transmission, non-coherent cooperation transmission, and partial coherent cooperation transmission of more than two cooperation entities with different antenna ports in the scenario of multi-downlink control information (DCI) scheduling multi-cooperation entity cooperation transmission.

[0314] FIG. 10C is a flowchart of a joint transmission method provided by an embodiment of the application. As shown in FIG. 10C, the joint transmission method is performed on a cooperation entity and includes at least one of the following operations: operation 701D: receiving UE capability reported by a user equipment (UE). The UE capability supports multi-cooperation entity cooperation enhancement, the multi-cooperation entity cooperation enhancement is applied to a scenario of multi-downlink control information (DCI) scheduling multi-cooperation entity cooperation transmission, the number of the multi-cooperation entities is greater than or equal to 2, and the number of the multi-cooperation entities is a capability item of the UE capability; and operation 702D: performing joint transmission based on the UE capability.

[0315] By the technical solution, the cooperation entity receives the UE capability reported by the UE, the UE capability supports multi-cooperation entity cooperation enhancement, and the multi-cooperation entity cooperation enhancement is applied to a scenario of multi-downlink control information (DCI) scheduling multi-cooperation entity cooperation transmission. In this way, the UE can support coherent cooperation transmission, non-coherent cooperation transmission, and partial coherent cooperation transmission of more than two cooperation entities with different antenna ports in the scenario of multi-downlink control information (DCI) scheduling multi-cooperation entity cooperation transmission.

[0316] For multi-cooperation entity joint transmission, some embodiments of the present application consider single-DCI scheduling multi-cooperation entity enhanced transmission, and multi-DCI scheduling multi-cooperation entity enhanced transmission, while some embodiments of the present application extend the existing Multi-TRP cooperation transmission from the scene, and the reception points of the multiple cooperation entities are not limited to a single base station TRP, but consider a distributed MIMO scene based on modular antennas, which means that the multiple cooperation entities may be multiple antenna panels, antenna arrays, or TRPs belonging to a control center, or multiple antenna panels, antenna arrays, or TRPs belonging to multiple control centers.

[0317] Specifically, in some embodiments, the UE is, for example, the user equipment 120 shown in FIG. 4. The network device is, for example, the network device 110 shown in FIG. 4. The network device 110 is, for example, a cooperation entity or a base station or an LMF.

[0318] The sixth technical problem: control channel enhancement for multi-DCI multi-cooperation entity non-coherent cooperation. Currently, NR supports non-coherent transmission of two TRPs, and when the backhaul between the two TRPs is non-ideal, the PDCCH of the two TRPs independently schedules the associated PDSCH, and the terminal distinguishes the DCI of different TRPs based on different CORESETPoolIndex. Here, it is assumed that the terminal supports non-coherent joint transmission between 4 cooperation entities. Since the cooperation entities may belong to the same control center, or some cooperation entities belong to the same control center, or each cooperation entity belongs to a different control center, and the backhaul between different control centers is non-ideal, some embodiments of the present application consider multiple DCIs for scheduling one or more cooperation entities for non-coherent cooperation transmission. The terminal needs to know the correspondence between each DCI and the cooperation entity, but the existing standard supports at most 2 cooperation entities, so the mapping relationship between DCI and cooperation entity needs to be considered when more cooperation entities are considered. The eleventh embodiment of the present application can solve the sixth technical problem.

[0319] CORESET configuration enhancement under BWP (eleventh embodiment):

[0320] The existing standard configures at most 5 CORESETs under each BWP, considering the configuration of CORESET 0 and some common CORESETs, and the terminal distinguishes different TRPs according to the CORESETPoolIdx corresponding to the DCI. Since some embodiments of the present application consider supporting multi-DCI scheduling more non-coherent cooperation transmission of cooperation entities, the number of CORESETs contained in the BWP needs to be increased, and the total number of CORESETs of the cell also needs to be increased. This scheme may affect the high-level configuration information.

[0321] MAC CE activates TCI, and TCI indicates enhancement (eleventh embodiment):

[0322] Considering the increase of the number of cooperating entities, each cooperating entity can correspond to one TCI state, and part of the cooperating entities can adopt coherent joint transmission, and other cooperating entities can adopt non-coherent joint transmission. For the multiple cooperating entities of coherent joint transmission, they can adopt single DCI scheduling, and other cooperating entities are independently scheduled. For the above scenario, because the TCI state activated by the existing standard MAC CE is bound with the CORESET, some embodiments of the present application propose that one DCI can be associated with multiple MAC CE activated TCI states, or determine that the DCI selects multiple cooperating entity corresponding TCI states at the same time through a standard predefined manner. This scheme can affect the indication of downlink scheduling information and TCI state selection information.

[0323] Eleventh embodiment: M-DCI non-coherent cooperative transmission BWP enhancement

[0324] In some embodiments of the present application, the scheme of the eleventh embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the schemes of multiple embodiments can be implemented in combination or independently.

[0325] In some embodiments of the application, the configuration information includes a control resource set (CORESET) configuration in a bandwidth part (BWP). In some embodiments of the application, the CORESET configuration in the BWP increases the number of CORESETs in the BWP and / or increases the total number of CORESETs of a cell. In some embodiments of the application, the method further includes receiving a DCI associated with multiple MAC CE activated TCI states or determining the multiple MAC CE activated TCI states by a predefined manner. In some embodiments of the application, for a DCI scheduling multiple cooperating entities, the TCI information field in the DCI indicates multiple TCI states, and the TCI states indicated by the DCI and the MAC CE activated TCI states are associated by a CORESET pool index (CORESETPoolIndex). In some embodiments of the application, the MAC CE activates multiple TCI state groups. In some embodiments of the application, each CORESET has an associated CORESETPoolIndex. In some embodiments of the application, one DCI is associated with at least one MAC CE for activating TCI states, and if multiple MAC CEs are configured with the same CORESETPoolIndex, the multiple MAC CE activated TCI states are determined by a predefined manner. In some embodiments of the application, the TCI information field of a DCI indicates multiple MAC CE activated TCI states.

[0326] Currently, non-coherent transmission of two TRPs is supported for NR, and when the backhaul between the two TRPs is non-ideal, the PDCCH of the two TRPs independently schedules the associated PDSCH. Currently, NR already supports coherent joint transmission of up to 4 TRPs, so the terminal also has the ability to support non-coherent joint transmission of up to 4 TRPs. Here, it is assumed that the terminal supports non-coherent joint transmission between N cooperating entities, for example, N = 4. Since the cooperating entities may belong to one control center, or some cooperating entities belong to the same control center, or each cooperating entity belongs to a different control center, and the backhaul between different control centers is non-ideal, this embodiment considers the following cases of multi-DCI non-coherent cooperative transmission:

[0327] Case 1: Each cooperating entity is independently scheduled.

[0328] Here it is assumed that the number of cooperative entities participating in non-coherent cooperative transmission is N, N DCIs are needed for scheduling, and non-coherent cooperative transmission based on multi-DCI will cause the CORESET of each cooperative entity to decrease. Since the TCI of each PDCCH is configured for each CORESET and the TCI configuration of different cooperative entities may be different, each cooperative entity may need at least one CORESET to schedule PDSCH. Currently, NR supports a maximum of 5 CORESETs per BWP per serving cell. Considering that each UE may transmit data with more cooperative entities (N>2), and CORESET0, BFR CORESET, CORESET for transmission of group-common DCI, the existing CORESET configuration needs to be increased by at least N-2 more than the existing basis.

[0329] Secondly, for M-TRP transmission based on multi-DCI in NR, PDSCH scheduling, HARQ-ACK feedback, etc. of each TRP can be independently performed. The UE needs to distinguish the scheduling from two different TRPs. Currently, the standard distinguishes them through the parameter CORESETPoolIndex in RRC. With the increase in the number of cooperative entities, the number of CORESETPoolIndex also needs to increase by at least N-2, and each cooperative entity corresponds to at least one CORESETPoolIndex. In the MAC CE information, 2 bits may be needed to indicate the CORESET Pool ID corresponding to the current MAC CE, for example, 00 corresponds to CORESET Pool ID 0 and 01 corresponds to CORESET Pool ID 1.

[0330] Furthermore, for the time interval between the received DCI and the corresponding PDSCH less than timeDurationForQCL, the standard can predefine that the TCI corresponding to the current PDSCH is consistent with the CORESET with the same CORESETPoolIndex value configuration in the currently activated BWP and the minimum CORESET-ID in the time slot closest to the PDSCH. Other rules can also be used here without specific constraints.

[0331] Case 2: Some cooperative entities are jointly scheduled, and some cooperative entities are independently scheduled.

[0332] For the above case, it is mainly considered that some of the cooperative entities in the cooperation may be ideal backhaul, and some of the cooperative entities have large delay of non-ideal backhaul. For example, the number of cooperative entities is 4, cooperative entities 1 and 2 are ideal backhaul, and cooperative entities 3 and 4 are ideal backhaul. For the above scenario, cooperative entities 1 and 2 can be scheduled by one DCI, and cooperative entities 3 and 4 can be scheduled by one DCI. Of course, the above is only one form that may exist in the cooperative entity, and other forms may also exist. Therefore, the standard needs to support flexible cooperation scenario configuration. The terminal may need to know which cooperative entities are ideal backhaul, that is, those cooperative entities are jointly scheduled by a single DCI. Those cooperative entities are non-ideal backhaul, that is, those cooperative entities are scheduled by independent DCI. At least one of the following schemes can be used:

[0333] In the existing NR system, the TCI state of PDSCH is determined by RRC configuration, MAC CE activation, and DCI indication in three steps. For the above scenario, multiple cooperative entities with ideal backhaul are scheduled by one DCI, and multiple cooperative entities with non-ideal backhaul are scheduled by different DCIs. Assuming that the number of cooperative entities is N, and the number of scheduling DCIs is D (D≤N), when D<N, at least one DCI schedules multiple cooperative entities.

[0334] Scheme one: for the DCI scheduling multiple cooperating entities, the TCI information indication field in the DCI is associated to multiple TCI states, the association between the TCI state indicated by the DCI and the TCI state activated by the MAC CE is through CORESETPoolIndex, and the MAC CE can activate multiple TCI state groups, each of which can contain at least one TCI state, and the number of TCI states contained in each TCI state group can refer to the scheme in embodiment 4. While the TCI information indication field in the DCI scheduling a single cooperating entity is associated to one TCI state, the association between the TCI state indicated by the DCI and the TCI state activated by the MAC CE is through CORESETPoolIndex, and the MAC CE can activate multiple TCI states. The configuration information of the MAC CE activating the TCI state is the same as that in the existing multi-DCI multi-TRP scenario of NR. For example, the number of cooperating entities is 4, of which cooperating entity 1 and cooperating entity 2 are ideal backhaul, i.e., cooperating entity 1 and cooperating entity 2 are scheduled by the same DCI, the TCI information indication field in the DCI is associated to the TCI state group in the MAC CE activation message (the message of activating the TCI state) with CORESETPoolIndex of 0, and the TCI state group contains at least one TCI state; cooperating entity 3 and cooperating entity 4 are non-ideal backhaul and are scheduled by different DCIs respectively, and the TCI information indication field in the DCI is respectively associated to the TCI state in the MAC CE activation message with CORESETPoolIndex of 1 and 2;

[0335] Scheme two: for the DCI scheduling multiple cooperating entities, the TCI information indication field in the DCI is associated to multiple TCI states, the association between the TCI states indicated by the DCI and the TCI states activated by the MAC CE is through CORESETPoolIndex, one DCI can be associated to at least one MAC CE message for activating TCI states, if multiple MAC CEs are configured with the same CORESETPoolIndex index information, the TCI state information activated by the multiple MAC CEs can be determined in a standard predefined manner, for example, two MAC CEs are configured with the same CORESETPoolIndex, MAC CE1 activates M TCI states, then the standard can stipulate that the TCI state activated by MAC CE2 has an offset relative to the TCI state activated by MAC CE1, that is, the TCI state activated by MAC CE2 is the TCI state activated by MAC CE1 + offset, as shown in FIG. 11A, the standard can stipulate that there is an offset k between the TCI states indicated by the TCI indication field of the DCI; or there is only one MAC CE activation message, the activation message activates M TCI states, and the standard also predefines that M TCI states offset offset k relative to the M TCI states are activated at the same time, as shown in FIG. 11B, the DCI message determines the association relationship based on the CORESETPoolIndex indication information in the MAC CE, thereby determining that the TCI information indication field in the DCI indicates the TCI corresponding to the PDSCH MAC CE activated TCI State, and then the TCI of the PDSCH of the other cooperating entity corresponds to the TCI State ID + offset k activated by the MAC CE; if there are more than two cooperating entities that may correspond to different offset values, for example, different k1 and k2 values;

[0336] Scheme three: for the DCI scheduling multiple cooperating entities, the TCI information indication field in the DCI is associated with multiple TCI states, the association between the TCI state indicated by the DCI and the TCI state activated by the MAC CE is through CORESETPoolIndex, one DCI is associated with one MAC CE message for activating TCI state, but the TCI information indication field of the DCI can indicate multiple TCI states activated by the MAC CE at the same time; for example, the MAC CE activates M TCI states, and the TCI information indication field in the DCI indicates that one of the TCI states is the reference TCI state, and the other TCI states can be determined in a standard predefined manner, for example, offset by k indexes relative to the reference TCI state index, or other standard predefined rules which are not specifically restricted here. The specific example is as follows: assuming that the MAC CE activates 8 TCI states, the corresponding indexes are 1-8 respectively, the number of cooperating entities is 2, and each cooperating entity corresponds to one TCI state for PDSCH transmission, and the DCI indicates that the first TCI state is the reference TCI, and the standard predefined offset k is 1 index, therefore, based on the TCI indication in the DCI, it can be determined that the TCI corresponding to the PDSCH of the two cooperating entities is two TCI states with indexes 1 and 2 respectively, wherein the mapping relationship between the cooperating entity and the TCI can be sequentially corresponding from small to large according to the index order of the cooperating entity and the index order of the TCI state.

[0337] Furthermore, the value of N and the support of the above-mentioned several schemes depend on the terminal's reported capability, for example, the number of supported cooperating entities can be 2, 3 or 4, and the specific value is reported based on the terminal's capability. Secondly, the number of TCI states / TCI groups activated by the MAC CE can also be reported as the terminal's capability. For example, the maximum number of TCI states / TCI groups activated by the MAC CE is M=8.

[0338] Seventh technical problem: multi-DCI scheduling multi-cooperating entity PDSCH interference reduction or elimination: based on the existing standard multi-DCI M-TRP transmission, full, partial or non-overlapping PDSCH can be used in time domain and frequency domain to transmit signals to UEs, but when the PDSCHs are partially or fully overlapped, the interference between the PDSCHs needs to be reduced or eliminated. The current standard specifies that the DMRS ports of two non-coherent transmission TRPs are mapped to different CDM groups, but when more cooperating entities are supported, the existing standard can only support up to 3 CDM groups, which cannot meet the cooperative transmission of more cooperating entities. Therefore, it is necessary to consider how to reduce or eliminate the interference between the PDSCHs when more (greater than or equal to 2) cooperating entities are supported. The twelfth embodiment of the present application can solve the seventh technical problem.

[0339] PDSCH interference reduction or elimination (twelfth embodiment):

[0340] To reduce the interference between PDSCHs, the existing NR standard stipulates that different TCI states are associated with different CDM groups, but the DMRS in the PDSCH in the existing standard supports at most 3 CDM group configurations, and the number of CDM groups may need to be increased, or the number of activated BWPs is increased or the activated BWP is split to reduce the interference between PDSCHs; the PDSCHs of different TRPs in the existing standard use different scrambling sequences, and the scrambling sequences supported by the cooperative entity are further increased, which also needs to be increased accordingly; this scheme may affect the configuration of the DMRS and the configuration of the high-level parameters.

[0341] Twelfth embodiment: PDSCH enhancement under multi-DCI multi-cooperative entity

[0342] In some embodiments of the present application, the scheme of the twelfth embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the schemes of multiple embodiments can be implemented in combination or independently.

[0343] In some embodiments of the present application, the configuration information further comprises PDSCH configuration information. In some embodiments of the present application, the PDSCH configuration information increases the number of CDM groups, increases the number of activated BWPs, splits the activated BWPs, and / or increases the scrambling sequence adopted by the PDSCH. The PDSCH configuration information can be PDSCH interference reduction or cancellation configuration. In some embodiments of the present application, different TCI states correspond to different CDM groups, and the number of CDM groups is equal to Z, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N. In some embodiments of the present application, when the number of PDSCHs involved in the overlapping part is greater than or equal to 2 or 3, some cooperating entities adopt the same CDM group. In some embodiments of the present application, when the number of cooperating entities is greater than 2 or 3, the cooperating entities are grouped, and the cooperating entities in the same group are scheduled with the same BWP bandwidth and subcarrier spacing, and the cooperating entities in different groups are scheduled with different BWP bandwidth and / or subcarrier spacing. In some embodiments of the present application, when the number of cooperating entities is greater than 2 or 3, the cooperating entities are grouped, and the BWP is divided into a plurality of sub-BWPs, the number of sub-BWPs is the same as the number of cooperating entity groups, and the cooperating entities in the same group are scheduled with the same sub-BWP under the BWP, and the cooperating entities in different groups are scheduled with different sub-BWPs.

[0344] Based on the existing standard multi-DCI M-TRP transmission, full, partial, or non-overlapping PDSCHs can be used in time and frequency domains to transmit signals to UEs, but when PDSCHs are partially or fully overlapped, the DMRS ports of two TRPs need to be mapped to different CDM groups. However, when more cooperating entities are supported, the existing standard can only support a maximum of 3 CDM groups, and it is not possible to support more cooperating entities for cooperative transmission according to the existing standard. Assuming that the maximum number of cooperating entities is N, for example, N=4, the following at least one scheme can be used:

[0345] Scheme one: if some time-frequency domain resources are occupied by multiple PDSCHs at the same time, the DMRS ports of the cooperating entities corresponding to the multiple PDSCHs are mapped to different CDM groups. When the number of cooperating entities is greater than or equal to 3, in order to ensure that different TCI states correspond to different CDM groups, more CDM groups can be considered to be supported, for example, N=4 CDM groups are considered to be supported, and a maximum of 24-port patterns are increased. At present, the CDM groups are divided according to the occupied frequency domain resources. For this, the pattern corresponding to the CDM group can adopt the form of FIG. 12A, FIG. 12B, and FIG. 12C.

[0346] Scheme two: If some part of time-frequency domain resource is occupied by multiple PDSCHs simultaneously, if the number of PDSCHs involved in the overlapping part is no more than 2 or 3, then the DMRS ports of the cooperating entities corresponding to the multiple PDSCHs are mapped to different CDM groups, so as to ensure that different TCI states correspond to different CDM groups. When the number of PDSCHs involved in the overlapping part is greater than or equal to 2 or 3, some of the cooperating entities can use the same CDM group, for example, two cooperating entities with a small time-frequency domain overlap area between them can use the same CDM group. When the number of PDSCHs involved in the overlapping part is greater than or equal to 2 or 3, some of the cooperating entities can use the same CDM group.

[0347] Scheme three: Assuming that the number of cooperating entities actually participating in cooperation is Z, in order to avoid more cooperating entities from appearing time-frequency domain complete overlap or partial overlap when scheduling PDSCH, for example, more than 3 cooperating entities scheduling PDSCH appear complete overlap or partial overlap; when the number of cooperating entities is greater than 2 or 3, the cooperating entities can be grouped, the cooperating entities in the same group use the same BWP bandwidth and subcarrier spacing for scheduling, and the cooperating entities in different groups can use different BWP bandwidth and / or subcarrier spacing for scheduling; for example, the number of cooperating entities is 4, each cooperating entity corresponds to a TCI state, two TCIs with TCI state numbers 1 and 2 correspond to group 1, and two TCIs with TCI state numbers 3 and 4 correspond to group 2, then group 1 can be scheduled using BWP1, and group 2 can be scheduled using BWP2; this means that each serving cell can activate two BWPs at the same time. The above TCI state number can also be the index number of CORESETPoolIdx, and can also be numbered according to the search space, for example, one or more CORESETs with the same search space index correspond to a group; at the same time, in order to avoid time-frequency domain overlap of PDSCHs corresponding to more cooperating entities under the same BWP, the standard can constrain the maximum number of cooperating entities scheduled using the same BWP and / or subcarrier spacing, for example, no more than 2 or 3.

[0348] Scheme four: assuming the number of actual participating collaborative entities is Z, in order to avoid more collaborative entities in the time and frequency domain completely overlapping or partially overlapping when scheduling PDSCH, for example, more than or equal to 3 collaborative entities scheduling PDSCH completely overlapping or partially overlapping; when the number of collaborative entities is greater than 2 or 3, the collaborative entities can be grouped, and the BWP can be divided into multiple sub-BWPs, the number of sub-BWPs is the same as the number of collaborative entity groups, the same group of collaborative entities uses the same sub-BWP in the BWP for scheduling, and different groups of collaborative entities can use different sub-BWPs for scheduling; for example, the number of collaborative entities is 4, each collaborative entity corresponds to a TCI state, and the two TCIs with TCI state numbers 1 and 2 correspond to group 1, and the two TCIs with TCI state numbers 3 and 4 correspond to group 2, then group 1 can use sub-BWP1 for scheduling, and group 2 can use sub-BWP2 for scheduling; this means that each serving cell still activates one BWP at the same time, but the BWP can be split into two sub-BWPs. The above TCI state number can also be the index number of CORESETPoolIdx, and it can also be numbered according to the search space, for example, one or more CORESETs with the same search space index correspond to a group; at the same time, in order to avoid the time and frequency domain overlap of PDSCH corresponding to more collaborative entities in the same sub-BWP, the standard can constrain the maximum number of collaborative entities scheduled using the same sub-BWP, for example, no more than 2 or 3; secondly, the indication of BWP splitting can be configured by RRC, or dynamically indicated by MAC CE or DCI, for example, indicating the frequency domain starting position of the second sub-BWP, or the frequency domain bandwidth or the number of RBs contained by the first sub-BWP. Or configure multiple candidate values (such as the frequency domain starting position of the second sub-BWP, or the frequency domain bandwidth of the first sub-BWP, or the number of sub-bands contained, or the number of RBs contained) through RRC, and then indicate which value through MAC CE or DCI.

[0349] In addition, in order to reduce interference, the existing standard supports using different scrambling sequences for PDSCH of two TRPs, considering that more collaborative entities may be supported, the standard needs to support using different scrambling sequences for PDSCH scheduled by more collaborative entities, for example, using different scrambling sequences for PDSCH of a maximum of N collaborative entities, for example, N = 4; different collaborative entities can be distinguished based on different CORESETPoolIdx, TCI state, or based on corresponding search space.

[0350] Further, the value of N / Z and the support of the above-mentioned schemes depend on the terminal's reported capability, for example, the number of supported cooperation entities can be 2, 3 or 4, and the specific value is based on the terminal's capability report. Secondly, the number of BWP supported by the terminal can also be reported as the terminal's capability. For example, a maximum of 2 BWP is supported.

[0351] HARQ feedback enhancement (thirteenth embodiment):

[0352] The existing standard supports HARQ independent feedback and joint feedback. In independent feedback, it is necessary to ensure that the PUCCH / PUSCH time domain carrying HARQ information does not overlap. However, with the increase of cooperation entities, the existing PUCCH configuration constraint may be difficult to meet the requirement of time domain non-overlapping. To this end, some embodiments of the present application further increase the number of resources contained in the long format PUCCH resource set and the number of long format PUCCH resources that can be contained in each time slot; this scheme mainly affects the configuration of the high-level parameter.

[0353] Thirteenth embodiment: M-TRP HARQ independent feedback:

[0354] In some embodiments of the present application, the scheme of the thirteenth embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the schemes of multiple embodiments can be implemented in combination or independently.

[0355] In some embodiments of the present application, the configuration information further includes a hybrid automatic repeat request (HARQ) feedback enhancement configuration. In some embodiments of the present application, the HARQ feedback enhancement configuration increases the number of resources contained in the long format physical uplink control channel (PUCCH) resource set and / or increases the number of long format PUCCH resources contained in each time slot. In some embodiments of the present application, the uplink resources indicated by multiple cooperation entities are in one time slot or in different time slots, and three long format PUCCHs are configured for each time slot. The number of resources contained in the long format PUCCH resource set is a maximum of 16, 24 or 32.

[0356] Rel-16 specifies that for multi-DCI based M-TRP transmission, when independent HARQ-ACK feedback is configured for the UE, the PUSCH / PUCCH resources indicated by two TRPs cannot overlap with each other and must be time-division multiplexed. However, the PUCCH / PUSCH resources indicated by two TRPs can be in one slot or in different slots, and when independent HARQ-ACK feedback is configured for the UE, the transmission of two long format PUCCHs in one slot is supported.

[0357] For non-coherent cooperative transmission of more cooperative entities (more than two cooperative entities), since the PUCCH resources of each cooperative entity are independently scheduled, the probability of PUCCH time domain collision is further increased. For this, the following possible solutions are mainly considered in this embodiment, and at least one of the following solutions can be used in specific implementation:

[0358] Solution one: for multi-DCI based multi-cooperative entity non-coherent transmission, the number of cooperative entities is greater than or equal to two, and when independent HARQ-ACK feedback is configured for the UE, the PUSCH / PUCCH resources indicated by multiple cooperative entities can be in one slot or in different slots. Each slot can be configured with 3 long format PUCCHs, and in order to reduce the collision probability, the number of resources contained in the long format resource set is further increased, for example, 16, 24 or 32.

[0359] Fourteenth embodiment: delay offset calibration for multi-TRP coherent cooperative transmission

[0360] In some embodiments of the present application, the solution of the fourteenth embodiment can be implemented in combination with the solutions of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the solutions of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the solutions of multiple embodiments can be implemented in combination or independently.

[0361] In some embodiments of this application, it is assumed that ideal synchronization exists between multiple cooperating entities during coherent transmission. However, in real-world systems, non-ideal synchronization often exists between multiple cooperating entities, severely degrading the performance of coherent collaboration. The factors leading to non-ideal synchronization between multiple coherent cooperating entities mainly include three aspects: time delay deviation between cooperating entities, frequency deviation between cooperating entities, and phase deviation between cooperating entities.

[0362] The latency discrepancy between cooperating entities stems from two sources. Firstly, the propagation latency between different cooperating entities and the UE varies significantly due to their different locations and the movement of the UE. Secondly, the hardware implementation of the cooperating entities also leads to differences in DL transmission timing.

[0363] Regarding the latency deviation of cooperating entities, based on current standard discussions, the terminal will select one reference resource or resource set from among multiple measurement / tracking reference resources or resource sets corresponding to the cooperating entities as a reference. The latency deviation between other cooperating entities participating in the cooperative transmission and the reference entity is then determined through... The representation is in bits, where N is the actual number of collaborating entities that may participate in the collaboration, and M... D Represents 0 to A D The number of time delay deviation values ​​quantized at uniform intervals between them, A D The maximum possible values ​​for the delay deviation are {0.5CP, CP, 0.75CP, 1.5CP,} In the context of}, CP (cyclic prefix) is the length of the cyclic prefix within a time slot or time unit (e.g., the length of the normal CP in the NR standard, or the length of the cyclic prefix in 6G / 7G), and Δf is the subcarrier spacing.

[0364] For reporting latency deviations (e.g., the reporting value is configured as 'cjtc-Dd'(Doffset+d)), since the reference cooperating entity is selected by the terminal, the terminal will report the reference resource or resource set index of the reference cooperating entity based on the RRC configuration. The reference resource or resource set can be a TRS or CSI-RS, thus feeding back to the network side which reference cooperating entity was selected when reporting latency deviations. Simultaneously, the terminal will also report... The bit calibrates the delay deviation. Additionally, the terminal reports an identifier d indicating whether the delay deviation value of a non-reference cooperating entity relative to the reference cooperating entity exceeds a certain range. n, wherein n∈[0,N-1], the identifier is represented by N-1 bits, each bit corresponds to a non-reference cooperative entity, in the standard, the non-reference cooperative entity corresponds to the measurement resource, the mapping order of the above three reported quantities in the encoding, and the reporting, the present application provides the following scheme, at least one of the following schemes can be used in the implementation process:

[0365] Scheme one: the index information of the reference cooperative entity is mapped preferentially, the quantized bit value of the time delay deviation of the non-reference cooperative entity relative to the reference cooperative entity is mapped secondly, and the identifier of whether the time delay deviation value of the non-reference cooperative entity relative to the reference cooperative entity exceeds a certain range is mapped lastly. When the time delay deviation value of the non-reference cooperative entity relative to the reference cooperative entity is within a certain range (for example, A D ), the terminal can omit this part of information when reporting, thereby saving the reporting overhead; or when the time delay deviation value of the non-reference cooperative entity relative to the reference cooperative entity is not within a certain range (for example, A D ), the terminal can omit this part of information when reporting, thereby saving the reporting overhead; or when the quantized bit of the time delay deviation corresponding to each non-reference entity is 0 or 1, the terminal can omit this part of information when reporting; or when the quantized bit of the time delay deviation corresponding to each non-reference entity is not all 0 or 1, the terminal can omit this part of information when reporting.

[0366] Or the 1-bit information is used to represent whether the time delay deviation value of the current non-reference cooperative entity relative to the reference cooperative entity is within or not within a certain range (for example, A D ), and bits 0 / 1 represent that they are within the range, and bits 1 / 0 represent that they are not within the range; or when the quantized bit of the time delay deviation corresponding to each non-reference entity is 0 or 1, the 1-bit information is used to represent whether they are within or not within the range, and bits 0 / 1 represent that they are within the range, and bits 1 / 0 represent that they are not within the range.

[0367] Further, the mapping order of the above-mentioned time delay deviation quantized bit value and the identifier of whether the time delay deviation value exceeds a certain range can be reversed, that is, the identifier of whether the time delay deviation value exceeds a certain range is mapped first, and then the time delay deviation quantized bit value is mapped.

[0368] Scheme two: the index information of the reference cooperative entity is mapped preferentially, the identifier of whether the time delay deviation value of the non-reference cooperative entity relative to the reference cooperative entity exceeds a certain range is mapped secondly, and the quantized bit value of the time delay deviation of the non-reference cooperative entity relative to the reference cooperative entity is mapped lastly. When the identifier of whether the time delay deviation value exceeds a certain range is 1, the quantized bit value of the time delay deviation of the non-reference cooperative entity relative to the reference cooperative entity can not be reported, or the base station can not decode this part of value when decoding.

[0369] Scheme three: identifier d of whether the non-reference cooperating entity's time offset value relative to the reference cooperating entity exceeds a certain range when the terminal reports the time offset deviation n Whether to report (where n∈[0,N-1]) depends on the terminal's capability, and the terminal can report the capability item time offset calibration report containing identifier d n The report of the corresponding bit information. Or the terminal reports whether the identifier corresponding bit information is contained in the time offset deviation compensation information reported by the base station through 1 bit information when reporting, 0 or 1 indicates that the identifier corresponding bit information is contained; Or whether the terminal reports the identifier information in the time offset deviation compensation information is network side configuration, if the network side configuration information indicates that the terminal does not need to report the identifier information when reporting the time offset deviation compensation information, the terminal does not report the identifier information when reporting.

[0370] Fifteenth embodiment: time-frequency offset calibration in multi-TRP coherent cooperation transmission

[0371] In some embodiments of the present application, the scheme of the fifteenth embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and / or the seventeenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, the sixteenth embodiment, and the seventeenth embodiment. In some embodiments of the present application, the schemes among multiple embodiments can be implemented in combination or independently.

[0372] In some embodiments of the present application, based on the fourteenth embodiment, for frequency offset reporting (for example, the reporting quantity is configured as 'cjtc-F' (frequency offset)), the terminal's reporting quantity mainly includes the reference resource or resource set index of the reference cooperating entity based on RRC configuration, and the reference resource or resource set can be TRS or CSI-RS, so that when the frequency offset is fed back to the network side, the selected reference cooperating entity is which one. At the same time, the terminal also reports the frequency offset quantization bit value of the non-reference cooperating entity relative to the reference cooperating entity, and the number of bits is Where M Frepresents the number of uniformly quantized delay offset values between 0 and AFO, AFO represents the maximum frequency offset value, the possible values of AFO are one or more of {0.025ppm, 0.05ppm, 1 / (8Δt), 1 / (16Δt), 1 / (32Δt)}, ppm (parts per million) is a unit used to represent frequency error, which is used to measure the difference between the actual frequency and the nominal frequency, i.e. the frequency offset, Δt is the duration of an OFDM symbol; and it has been agreed in the standard that the delay offset and the frequency offset can be reported jointly (for example, the reporting quantity configuration is ‘cjtc-Dd-F’ (joint Doffset+d and FO)), and the encoding mapping rule when reporting jointly can adopt at least one of the following schemes:

[0373] Scheme one: first, map the resource or resource set index corresponding to the reference cooperation entity of the delay offset and the frequency offset respectively, and the order can not be distinguished, which depends on the final agreement of the standard; second, the content of the subsequent mapping can be determined according to whether the resource or resource set index corresponding to the reference cooperation entity of the delay offset or the frequency offset is mapped first. For example, if the resource or resource set index corresponding to the reference cooperation entity of the delay offset is mapped first, then the next mapping is based on the other quantities required to be reported by the delay offset in embodiment 14, the mapping order is the same as in embodiment 14, and finally the calibration quantization bit value of the frequency offset is mapped. Based on the above mapping rule, the identifier d n In some cases, whether to omit is the same as in embodiment 14, where n∈[0,N-1].

[0374] Scheme two: all the quantities required to be reported by the delay offset calibration are encoded and mapped together, and all the quantities required to be reported by the frequency offset calibration are also encoded and mapped together, and the mapping order of the two after encoding can not be distinguished, which can be predefined by the standard. Secondly, the mapping order of the internal information of the delay offset mentioned in embodiment 14 and the identifier d n In some cases, whether to omit is also applicable to this scheme, where n∈[0,N-1].

[0375] Sixteenth embodiment: type-I codebook enhancement:

[0376] In some embodiments of the present application, the scheme of the sixteenth embodiment can be implemented in combination with the schemes of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and / or seventeenth embodiments, or can be implemented independently of the schemes of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, and seventeenth embodiments. In some embodiments of the present application, the schemes among multiple embodiments can be implemented in combination or independently.

[0377] In some embodiments of the present application, for the Type-I and Type-II based codebook enhancement scheme, when the terminal supports a codebook scheme with a maximum of 128 antenna ports across multiple CSI-RS resources, since the frequency band used by the codebook may cause interference to other systems, a scaling factor is agreed to be introduced in the interference standard discussion process to realize power scaling of the candidate spatial domain basis vectors in the Type-I codebook, and the specific scaling factor value is Currently, power scaling of a group of spatial domain basis vectors can be realized by 3 bits in RRC signaling, and the division of the spatial domain basis vector group is represented by X1 and X2, X1 represents the number of spatial domain basis vectors or the number of beams in the horizontal direction, and X2 represents the number of spatial domain basis vectors or the number of beams in the vertical direction. Currently, only the case of RI=v=1 is considered, and v represents the corresponding layer group. If it is extended to a multi-Rank scene, i.e., RI=v>1, at least one of the following indication schemes can be selected:

[0378] Scheme one: when RI=v>1, all layers share the scaling factor indication information, for example, when RI=2, the scaling factor information for the spatial domain basis vector group configured by RRC is applicable to the spatial domain basis vector group corresponding to layer 1, and is also applicable to the spatial domain basis vector group corresponding to layer 2, and the spatial domain basis vector groups corresponding to layer 1 and layer 2 are the same. In this way, the network side does not need to configure the scaling factor for the spatial domain basis vector group for each layer, thereby greatly saving the configuration overhead.

[0379] Scheme two: when RI=v>1, all layers share the scaling factor indication information, but at this time, the scaling factor corresponding to each group of spatial domain basis vectors is not 3 bits, but can be a smaller number of bits, 1 bit or 2 bits. Mainly because after multiple layer groups, the network side will control the power of the transmission beam accordingly, so each beam is partially scaled relative to the beam power when RI=1, so the network side may only need to select a subset of the candidate scaling factors subsets, the indication overhead of each spatial domain vector group is related to the size of the subset, if the subset contains S scaling factors, each spatial domain basis vector group indication needs bits. For example, if the subset contains only 2 elements, only 1 bit is needed, if the subset contains only 4 elements, only 2 bits are needed. The indication of the scaling factor of the spatial domain basis vector group can be separately indicated for each layer, or can be shared by all layers. Secondly, for different RI values, the subset of the scaling factor can also be different, for example, when RI = 2, the subset of the scaling factor can contain 4 scaling factors, for example, and when RI > 2 or RI = 4, the subset of the scaling factor can contain 2 scaling factors, for example, Note that the above is only a specific example, in fact, the subset of the scaling factor can be any part of the full set. Through this scheme, the indication overhead of the scaling factor of the spatial domain vector group can be obviously reduced.

[0380] Furthermore, for Type-II codebook enhancement, when supporting a codebook scheme with a maximum of 128 antenna ports across multiple CSI-RS resources, the above-mentioned scheme is also applicable.

[0381] Seventeenth Embodiment: L1 / L2 Triggered Mobility Management Scenario Based on CSI-RS Beam Management:

[0382] In some embodiments of the present application, the scheme of the seventeenth embodiment can be implemented in combination with the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, and / or the sixteenth embodiment, or can be implemented independently of the schemes of the first embodiment, the second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the ninth embodiment, the tenth embodiment, the eleventh embodiment, the twelfth embodiment, the thirteenth embodiment, the fourteenth embodiment, the fifteenth embodiment, and the sixteenth embodiment. In some embodiments of the present application, the schemes among multiple embodiments can be implemented in combination, or can be implemented independently.

[0383] In some embodiments of the present application, for L1 / L2 (first layer / second layer) triggered mobility management, currently only SSB beam-based measurement reporting is supported, and CSI-RS-based beam measurement reporting is not supported. If CSI-RS-based beam management is to be supported, at least one of the following schemes can be used:

[0384] Scheme one: the configuration of CSI-RS resource is periodic, only supports 2 antenna ports at most, and the configuration of CSI-RS resource is started by candidate cell after candidate cell receives measurement request sent by serving cell.

[0385] Scheme two: the configuration of CSI-RS resource is semi-persistent or aperiodic, only supports 2 antenna ports at most, and the configuration of CSI-RS resource is started by candidate cell after candidate cell receives measurement request sent by serving cell. And the semi-persistent or aperiodic CSI-RS resource starts to trigger from the time of configuration without a separate trigger signal to further trigger, and the semi-persistent CSI-RS resource also does not need a separate deactivation signal. The handover command can be regarded as a semi-persistent CSI-RS deactivation signal. When the serving cell issues a handover command, all semi-persistent CSI-RS measurement resources are not valid for the terminal, and the serving cell informs all candidate cells of this information, and all candidate cells stop issuing CSI-RS measurement signals.

[0386] Scheme three: the configuration of CSI-RS resource is semi-persistent or aperiodic, and there is a QCL relationship between the configuration of CSI-RS resource and SSB. When the L1-RSRP information is reported based on SSB measurement, the candidate cell will inform the serving cell to trigger the CSI-RS resource, and the serving cell can issue the trigger signal of CSI-RS at the same time as the handover signal, or activate it through the MAC CE or DCI information issued by the serving cell.

[0387] FIG. 13 is a schematic structural diagram of a wireless communication device 700 provided by an embodiment of the present application. The wireless communication device can be a user equipment, a base station, or a network element. The wireless communication device 700 shown in FIG. 13 includes a processor 710. The processor 710 can call and run a computer program from a memory to implement the method in the embodiments of the present application.

[0388] Optionally, as shown in FIG. 13, the wireless communication device 700 can further include a memory 720. The processor 710 can call and run a computer program from the memory 720 to implement the method in the embodiments of the present application. The memory 720 can be a separate device independent of the processor 710, or can be integrated in the processor 710.

[0389] Optionally, the wireless communication device 700 can further include a transceiver 730, which can be controlled by the processor 710 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices. The transceiver 730 can include a transmitter and a receiver. The transceiver 730 can further include an antenna, and the number of antennas can be one or more.

[0390] Optionally, the wireless communication device 700 can specifically be the network device 110 of the embodiments of the present application, and the wireless communication device 700 can implement the corresponding procedures in the various methods of the embodiments of the present application implemented by the network device 110. For brevity, details are not described herein.

[0391] Optionally, the wireless communication device 700 can specifically be the user equipment of the embodiments of the present application, and the wireless communication device 700 can implement the corresponding procedures in the various methods of the embodiments of the present application implemented by the user equipment. For brevity, details are not described herein.

[0392] Optionally, the wireless communication device 700 can specifically be the network element of the embodiments of the present application, and the wireless communication device 700 can implement the corresponding procedures in the various methods of the embodiments of the present application implemented by the network element. For brevity, details are not described herein.

[0393] FIG. 14 is a schematic structural diagram of a chip according to an embodiment of the present application. The chip 800 shown in FIG. 14 includes a processor 810, which can call and run a computer program from a memory to implement the method in the embodiments of the present application.

[0394] Optionally, the chip 800 can further include a memory 820, as shown in FIG. 14. The processor 810 can call and run a computer program from the memory 820 to implement the method in the embodiments of the present application. The memory 820 can be a separate device independent of the processor 810, or can be integrated in the processor 810.

[0395] Optionally, the chip 800 can further include an input interface 830. The processor 910 can control the input interface 830 to communicate with other devices or chips, specifically, to obtain information or data sent by other devices or chips.

[0396] Optionally, the chip 800 can further include an output interface 840. The processor 810 can control the output interface 840 to communicate with other devices or chips, specifically, to output information or data to other devices or chips.

[0397] Optionally, the chip can be applied to the network device 110 in the embodiments of the present application, and the chip can implement the corresponding procedures implemented by the network device 110 in the various methods of the embodiments of the present application. For brevity, details are not described herein.

[0398] Optionally, the chip can be applied to the user equipment in the embodiments of the present application, and the chip can implement the corresponding procedures implemented by the user equipment in the various methods of the embodiments of the present application. For brevity, details are not described herein.

[0399] Optionally, the chip can be applied to the network element in the embodiments of the present application, and the chip can implement the corresponding procedures implemented by the mobile network element in the various methods of the embodiments of the present application. For brevity, details are not described herein.

[0400] FIG. 15 is a schematic block diagram of a wireless communication system 100 provided by the embodiments of the present application. As shown in FIG. 15, the communication system 100 includes a user equipment 120 and a network device 110. The user equipment 120 can be configured to implement the corresponding functions implemented by the user equipment 120 in the above methods, and the network device 110 can be configured to implement the corresponding functions implemented by the network device 110 in the above methods. For brevity, details are not described herein.

[0401] It should be understood that the processor of the embodiments of the present application can be an integrated circuit chip with a processing capability of signals. In the implementation process, each step of the above method embodiments can be completed by integrated logic circuits or instructions in the form of software in the processor.

[0402] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. It should be noted that the memory of the system and method described herein is intended to include but not limited to these and any other suitable types of memory. The embodiments of the present application also provide a computer readable storage medium for storing a computer program.

[0403] Optionally, the computer readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program causes the computer to execute the corresponding procedures implemented by the network device in the various methods of the embodiments of the present application. For brevity, details are not described herein. Optionally, the computer readable storage medium can be applied to the user equipment in the embodiments of the present application, and the computer program causes the computer to execute the corresponding procedures implemented by the user equipment in the various methods of the embodiments of the present application. For brevity, details are not described herein.

[0404] The embodiments of the present application also provide a computer program product, which includes computer program instructions.

[0405] Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding procedures implemented by the network device in the various methods of the embodiments of the present application. For brevity, details are not described herein. Alternatively, the computer program product can be applied to the user equipment in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding procedures implemented by the user equipment in the various methods of the embodiments of the present application. For brevity, details are not described herein.

[0406] The embodiments of the present application further provide a computer program.

[0407] Optionally, the computer program can be applied to the network device in the embodiments of the present application, and when the computer program runs on the computer, causes the computer to execute the corresponding procedures implemented by the network device in the various methods of the embodiments of the present application. For brevity, details are not described herein. Alternatively, the computer program can be applied to the user equipment in the embodiments of the present application, and when the computer program runs on the computer, causes the computer to execute the corresponding procedures implemented by the user equipment in the various methods of the embodiments of the present application. For brevity, details are not described herein.

[0408] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0409] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A joint transmission method, performed at a user equipment (UE), wherein, The joint transmission method comprises: reporting UE capability to a cooperative entity, wherein the UE capability supports multi-cooperative entity cooperation enhancement, the multi-cooperative entity cooperation enhancement is applied to a scenario of single downlink control information (DCI) scheduling multi-cooperative entity cooperation transmission, the number of the multi-cooperative entities is greater than or equal to 2, and the number of the multi-cooperative entities is taken as one capability item of the UE capability; based on the single DCI scheduling multi-cooperative entity cooperation transmission, the UE feeds back information to at least one of the cooperative entities.

2. The joint transmission method of claim 1, wherein, The multi-cooperative entity cooperation transmission comprises multi-cooperative entity non-coherent joint transmission and / or multi-cooperative entity partial-coherent joint transmission.

3. The joint transmission method of claim 1, wherein, The multi-cooperative entity cooperation enhancement also supports multi-layer physical downlink shared channel (PDSCH) data transmission, and the multi-layer PDSCH data transmission is taken as one capability item of the UE capability.

4. The joint transmission method of claim 1, wherein, The multi-cooperative entity cooperation enhancement also supports one or more multiplexing modes of frequency division multiplexing (FDM) mode, time division multiplexing (TDM) mode, and space division multiplexing (SDM) mode, and one or more of the FDM mode, the TDM mode, and the SDM mode is taken as one or more capability items of the UE capability.

5. The joint transmission method of claim 4, wherein, The FDM mode comprises one or more of single DCI FDM-A multiplexing mode and single DCI FDM-B multiplexing mode, the TDM mode comprises one or more of single DCI TDM-A multiplexing mode and single DCI TDM-B multiplexing mode, and the SDM mode comprises single DCI SDM multiplexing mode.

6. The joint transmission method of claim 5, wherein, In the single DCI SDM multiplexing mode, the maximum number of cooperative entities is N, the maximum number of phase tracking reference signal (PTRS) antenna ports is N, and N is greater than or equal to 2.

7. The joint transmission method of claim 6, wherein, N can be any one of 3 to 8.

8. The joint transmission method of claim 7, wherein, An association relationship between a PTRS antenna port and a demodulation reference signal (DMRS) antenna port is determined based on a predefined mode.

9. The joint transmission method of claim 8, wherein, Each PTRS antenna port is respectively associated with a DMRS antenna port corresponding to a lowest index value of a different transmission configuration indication (TCI) state.

10. The joint transmission method of claim 5, wherein, In the single DCI FDM-A multiplexing mode, the maximum number of cooperative entities is N, N is greater than or equal to 2, frequency domain resources occupied by one PDSCH are divided into at most N groups, each group corresponds to one cooperative entity, and each cooperative entity transmits part of a PDSCH on one frequency domain group belonging to the PDSCH.

11. The joint transmission method of claim 10, wherein, The multi-cooperative entities support maximum 4-layer or 8-layer PDSCH transmission, and each cooperative entity transmits maximum 1, 2, 3, or 4 layers of data.

12. The joint transmission method of claim 10, wherein, The UE is configured with maximum N TCI states in single DCI, and the actual number of TCI states is equal to the number of cooperative entities.

13. The joint transmission method of claim 12, wherein, The DMRS antenna port of the PDSCH is from one code division multiplexing (CDM) group.

14. The joint transmission method of claim 12, wherein, The DMRS antenna port of the PDSCH is from different CDM groups.

15. The joint transmission method of claim 12, wherein, If the precoding matrices used by X consecutive physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, X PRBs are referred to as a physical resource group (PRG), and X takes at least one value from {1, 2, 3, 4, 6, 8, 16, and full bandwidth}. When X takes at least one value from {1, 2, 3, 4, 6, 8, 16, and full bandwidth}, a mapping relationship between PDSCH data information and PRBs is determined in a predefined manner based on the number of cooperating entities. Each portion of PDSCH data information is mapped to corresponding frequency domain resources and is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

16. The joint transmission method of claim 15, wherein, Each portion of PDSCH data information is mapped in index order to each portion of PRBs for transmission and is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

17. The joint transmission method of claim 15, wherein, X PRBs are split into Z portions, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, each portion of PRBs contains n consecutive PRBs, and each corresponding portion in each PRG is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

18. The joint transmission method of claim 15, wherein, The value of X is configured by a high-layer radio resource control (RRC) parameter.

19. The joint transmission method of claim 15, wherein, The value of X is indicated by a medium access control (MAC) control element (CE) or DCI.

20. The joint transmission method of claim 15, wherein, Multiple candidate values of X are configured by a high-layer RRC parameter, and the value of X is indicated according to a MAC CE or DCI.

21. The joint transmission method of claim 5, wherein, In the single-DCI FDM-B multiplexing manner, the frequency domain resources occupied by one PDSCH are divided into Z groups, each group corresponds to one cooperating entity, each cooperating entity transmits one channel-coded symbol sequence, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, and the UE supports at least one of {1, 2, 3, 4, 5, 6, 7, and 8} layers of data transmission.

22. The joint transmission method of claim 21, wherein, If the precoding matrices used by X consecutive physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, X PRBs are referred to as a physical resource group (PRG), and X takes at least one value from {1, 2, 3, 4, 6, 8, 16, and full bandwidth}.

23. The joint transmission method of claim 22, wherein, When X takes at least one value from {1, 2, 3, 4, 6, 8, 16, and full bandwidth}, a mapping relationship between PDSCH data information and PRBs is determined in a predefined manner based on the number of cooperating entities.

24. The joint transmission method of claim 23, wherein, Each portion of PDSCH data information is mapped to corresponding frequency domain resources and is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

25. The joint transmission method of claim 23, wherein, Each portion of PDSCH data information is mapped in index order to each portion of PRBs for transmission and is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

26. The joint transmission method of claim 23, wherein, X PRBs are split into Z portions, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, each portion of PRBs contains n consecutive PRBs, and each corresponding portion in each PRG is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

27. The joint transmission method of claim 23, wherein, The value of X is configured by a high-layer radio resource control (RRC) parameter.

28. The joint transmission method of claim 23, wherein, X is indicated by a medium access control (MAC) control element (CE) or DCI.

29. The joint transmission method of claim 23, wherein, Multiple candidate values of X are configured by a higher layer RRC parameter, and a value of X is indicated according to a MAC CE or DCI.

30. The joint transmission method of claim 5, wherein, In the single-DCI FDM-B multiplexing mode, frequency domain resources occupied by one PDSCH are divided into Z groups, each group corresponding to one cooperative entity, and each cooperative entity transmits one channel-coded symbol sequence corresponding to a part of data layers, Z being the number of cooperative entities actually participating in cooperation, 2≤Z≤N, and all data layers are divided into two parts, each part containing data layers of any one of {1, 2, 3, 4, 5, 6, 7}, and the sum of the two parts of data layers is equal to the total number of transmitted data layers.

31. The joint transmission method of claim 5, wherein, In the single-DCI TDM-A multiplexing mode, time domain resources occupied by one PDSCH in one or two slots are divided into a maximum of N groups, each group corresponding to one cooperative entity, and each cooperative entity transmits a PDSCH transmission block that is repeated in different time domains, and a plurality of repeated PDSCH data blocks occupy the same frequency domain resources. And / or the number of slots occupied by a plurality of PDSCH transmissions is configured by one or more of RRC, MAC CE, and DCI, and the value is at least one of {1, 2, 3, 4}.

32. The joint transmission method of claim 5, wherein, In the single-DCI TDM-A multiplexing mode, time domain resources occupied by one PDSCH in one or two slots are divided into a maximum of N groups, each group corresponding to one cooperative entity, and each cooperative entity transmits a PDSCH transmission block that is repeated in different time slots, and a plurality of repeated PDSCH data blocks occupy the same frequency domain resources.

33. The joint transmission method of claim 32, wherein, The number of repeated transmissions of the PDSCH transmission block is any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}.

34. The joint transmission method of claim 32, wherein, The number of repeated transmissions of the PDSCH transmission block is configured by one or more of RRC, MAC CE, and DCI.

35. The joint transmission method of claim 32, wherein, The repeated transmission in the time slot adopts a sequential mapping or a cyclic mapping mode for transmission, the sequential mapping mode refers to at least one cooperative entity transmitting repeated PDSCH information in two or three consecutive time slots, and the repeated PDSCH information corresponds to the same TCI state, and the cyclic mapping mode refers to a plurality of cooperative entities alternately transmitting PDSCH transmission blocks through different TCI states, and the granularity of TCI change is one PDSCH transmission opportunity, and when all cooperative entities are traversed, the above process is repeated.

36. The joint transmission method of claim 5, wherein, In the single-DCI FDM and TDM multiplexing mode, one PDSCH is transmitted in the FDM-A and TDM multiplexing mode.

37. The joint transmission method of claim 36, wherein, PDSCH information transmitted by different cooperative entities is respectively associated with different TCI states.

38. The joint transmission method of claim 36, wherein, PDSCH information corresponding to different frequency domain resources under the same time domain resource belongs to one PDSCH transmission block and adopts the same redundancy version (RV) value.

39. The joint transmission method of claim 36, wherein, PDSCHs transmitted on different frequency domain resources have the same time domain repetition interval.

40. The joint transmission method of claim 5, wherein, In the FDM and TDM multiplexing manner of the single DCI, one PDSCH supports FDM-B and TDM multiplexing manner for transmission.

41. The joint transmission method of claim 40, wherein, The PDSCH data information is simultaneously mapped to multiple parts of frequency domain resources, and the PDSCH information mapped to the multiple parts of frequency domain resources adopts different channel coding manners.

42. The joint transmission method of claim 40, wherein, The multiple PDSCH transport blocks with the same time domain and different frequency domains adopt different RV values.

43. The joint transmission method of claim 40, wherein, The multiple PDSCH transport blocks with different time domains and the same frequency domain adopt the same RV value or different RV values.

44. The joint transmission method of claim 5, wherein, In the FDM and TDM multiplexing manner of the single DCI, if the precoding matrices used by X continuous physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, the X PRBs are referred to as a physical resource group (PRG), and X takes at least one value from {1, 2, 3, 4, 6, 8, 16, and full bandwidth}.

45. The joint transmission method of claim 44, wherein, When X takes at least one value from {1, 2, 3, 4, 6, 8, 16, and full bandwidth}, the mapping relationship between the PDSCH data information and the PRB is determined in a predefined manner based on the number of cooperating entities.

46. The joint transmission method of claim 45, wherein, Each part of the PDSCH data information is mapped to a corresponding frequency domain resource and is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

47. The joint transmission method of claim 45, wherein, Each part of the PDSCH data information is sequentially mapped to each part of the PRB for transmission according to an index order and is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

48. The joint transmission method of claim 45, wherein, X PRBs are split into Z parts, Z is the number of cooperating entities actually participating in cooperation, 2≤Z≤N, each part of the PRB contains n continuous PRBs, and each corresponding part in each PRG is transmitted by a corresponding cooperating entity or a cooperating entity corresponding to a TCI state.

49. The joint transmission method of claim 45, wherein, The value of X is configured by a high-layer radio resource control (RRC) parameter.

50. The joint transmission method of claim 5, wherein, In the FDM and TDM multiplexing manner of the single DCI, one PDSCH supports FDM-different layers and TDM multiplexing manner for transmission, where FDM-different layers refers to different layers or layer groups of PDSCH information transmitted on different frequency domain resources under the same time domain resource.

51. The joint transmission method of claim 50, wherein, The PDSCH information transmitted by different cooperating entities is respectively associated with different TCI states.

52. The joint transmission method of claim 50, wherein, The PDSCH transport blocks transmitted on different frequency domain resources under the same time domain resource are configured with the same RV value.

53. The joint transmission method of claim 50, wherein, For the PDSCH repeatedly transmitted on the same frequency domain resource and different time domain resources, different RV values are adopted.

54. The joint transmission method of claim 53, wherein, The RV value is indicated by an RV indication field of the DCI.

55. The joint transmission method of claim 5, wherein, In the FDM and TDM multiplexing manner of the single DCI, one PDSCH supports FDM and TDM-B multiplexing manner for transmission.

56. The joint transmission method of claim 55, wherein, The FDM multiplexing manner includes one or more of FDM-A multiplexing manner, FDM-B multiplexing manner, and FDM-different layers and TDM multiplexing manner, where FDM-different layers refers to different layers or layer groups of PDSCH information transmitted on different frequency domain resources under the same time domain resource.

57. The joint transmission method of claim 5, wherein, In the SDM and TDM multiplexing manner of the single DCI, the TDM multiplexing manner includes one or more of TDM-A multiplexing manner and TDM-B multiplexing manner.

58. The joint transmission method of claim 57, wherein, In the single-DCI SDM and TDM-A multiplexing mode, the time domain resources occupied by one PDSCH in one or two slots are divided into at most N groups, each group corresponding to one cooperating entity, and each cooperating entity transmits a PDSCH transmission block with repetition in different time domains, and the multiple repeated PDSCH data blocks occupy the same frequency domain resources.

59. The joint transmission method of claim 58, wherein, The number of slots occupied by the multiple PDSCH transmissions is configured by one or more of RRC, MAC CE, and DCI, and the value is at least one of {1, 2}.

60. The joint transmission method of claim 57, wherein, In the single-DCI SDM and TDM-B multiplexing mode, the time domain resources occupied by one PDSCH in one or two slots are divided into at most N groups, each group corresponding to one cooperating entity, and each cooperating entity transmits a PDSCH transmission block with repetition between slots, and the multiple repeated PDSCH data blocks occupy the same frequency domain resources.

61. The joint transmission method of claim 60, wherein, The number of repeated transmissions of the PDSCH transmission block is any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}.

62. The joint transmission method of claim 60, wherein, The number of repeated transmissions of the PDSCH transmission block is configured by one or more of RRC, MAC CE, and DCI.

63. The joint transmission method of claim 60, wherein, The repetition between slots adopts a sequential mapping or a cyclic mapping mode for transmission, the sequential mapping mode means that at least one cooperating entity transmits repeated PDSCH information in two or three consecutive slots, and the repeated PDSCH information corresponds to the same TCI state, and the cyclic mapping mode means that multiple cooperating entities alternately transmit PDSCH transmission blocks through different TCI states, and the granularity of TCI change is one PDSCH transmission opportunity, and when all cooperating entities are traversed, the above process is repeated.

64. The joint transmission method of claim 57, wherein, In the single-DCI SDM and TDM-A multiplexing mode, different cooperating entities or TCI states are used for data retransmission.

65. The joint transmission method of claim 1, wherein, The joint transmission method further includes: Receiving configuration information sent by the cooperating entity, the configuration information including configuration of measurement resources.

66. The joint transmission method of claim 65, wherein, The measurement resources corresponding to the multiple cooperating entities belong to one measurement resource set.

67. The joint transmission method of claim 65, wherein, The measurement resources corresponding to the multiple cooperating entities belong to multiple measurement resource sets.

68. The joint transmission method of claim 65, wherein, One or more measurement resource sets group multiple resources according to different cooperating transmission modes.

69. The joint transmission method of claim 65, wherein, One or more measurement resource sets divide resource subsets according to different cooperating transmission modes.

70. The joint transmission method of claim 65, wherein, One measurement resource corresponds to multiple cooperating entities.

71. The joint transmission method of claim 65, wherein, One cooperating entity corresponds to multiple measurement resources.

72. The joint transmission method of claim 65, wherein, Each cooperating entity corresponds to one measurement resource set, and each measurement resource set includes at least one channel state information-reference signal (CSI-RS) resource, and the multiple CSI-RS resources are configured with the same number of antenna ports or different numbers of antenna ports.

73. The joint transmission method of claim 72, wherein, The relationship between the cooperating entity and the CSI-RS resource is one-to-one, one-to-many, or many-to-one.

74. The joint transmission method of claim 65, wherein, The antenna modules corresponding to the multiple CSI-RS resources under the same resource group adopt coherent joint transmission or non-coherent joint transmission.

75. The joint transmission method of claim 65, wherein, Each cooperating entity configures at least one CSI-RS resource set for channel measurement, and each CSI-RS resource set contains at least one CSI-RS resource.

76. The joint transmission method of claim 75, wherein, The multiple antenna modules associated with the CSI-RS resources under each CSI-RS resource set adopt coherent joint transmission or non-coherent joint transmission.

77. The joint transmission method of claim 65, wherein, A subset of CSI-RS resources is configured in the CSI-RS resource set, and each subset contains at least one CSI-RS resource, and the number of antenna ports of the CSI-RS resources in the subset is the same or different.

78. The joint transmission method of claim 65, wherein, The multiple CSI-RS resources in the subset adopt coherent joint transmission or non-coherent joint transmission.

79. The joint transmission method of claim 65, wherein, In the coherent transmission mode, the CSI corresponding to part of the channel measurement resources is jointly fed back or independently fed back to one of the cooperating entities.

80. The joint transmission method of claim 65, wherein, At least one cooperating entity serving the same UE configures one channel measurement resource set, and the channel measurement resource set contains at least one channel measurement resource, and the multiple channel measurement resources under the channel measurement resource set are divided into multiple channel measurement resource groups, and the number of channel measurement resources under each channel measurement resource group is the same or different, and the antenna ports corresponding to each resource are the same or different.

81. The joint transmission method of claim 1, wherein, The joint transmission method further includes the selection of the cooperating cluster.

82. The joint transmission method of claim 81, wherein, The selection of the cooperating cluster is based on the number of cooperating entities, and the number of cooperating entities is configured by the cooperating entity.

83. The joint transmission method of claim 81, wherein, The selection of the cooperating cluster includes that the UE selects the cooperating entity according to a predefined condition when the predefined condition is met.

84. The joint transmission method of claim 81, wherein, The selection of the cooperating cluster includes that the UE selects part or all of the cooperating entities from the number of cooperating entities configured by the cooperating entity.

85. The joint transmission method of claim 81, wherein, The number of cooperating entities is indicated by the cooperating entity, selected by the UE, or both.

86. The joint transmission method of claim 81, wherein, The selection of the cooperating cluster is based on the selection of at least one antenna array / panel from multiple antenna arrays / panels connected to the same cooperating entity for signal transmission with the UE.

87. The joint transmission method of claim 86, wherein, For the UE, only one cooperating entity communicates with the UE.

88. The joint transmission method of claim 86, wherein, The UE feeds back the channel measurement results of the channel measurement resources corresponding to the multiple antenna arrays / panels, so that the cooperating entity selects one channel measurement result from the multiple channel measurement results fed back by the UE for the transmission of downlink information.

89. The joint transmission method of claim 81, wherein, The selection of the cooperating cluster is based on the selection of at least two antenna arrays / panels from multiple antenna arrays / panels connected to the same cooperating entity for coherent joint transmission, non-coherent joint transmission, or partial coherent joint transmission of signals with the UE.

90. The joint transmission method of claim 1, wherein, The joint transmission method further includes receiving an indication of TCI state from the cooperating entity.

91. The joint transmission method of claim 90, wherein, A TCI state group containing multiple TCI states is activated by a MAC CE.

92. The joint transmission method of claim 91, wherein, The MAC CE activates up to 8 TCI state groups, and a TCI state group contains one to N TCI states.

93. The joint transmission method of claim 91, wherein, When the number of cooperating cooperating entities is greater than two, two TCI information indication fields are configured.

94. The joint transmission method of claim 91, wherein, The MAC CE activates at most K TCI state groups, each of which contains one to two TCI states, and the TCI state used by the PDSCH is indicated by the DCI. When the number of cooperating cooperative entities is greater than two, the TCI information indication field indicates at least one TCI state group.

95. The joint transmission method of claim 91, wherein, When the number of cooperating cooperative entities is greater than one, the Y TCI states with the smallest TCI state ID number are activated by the MAC CE, and Y is the number of actual cooperative entities participating in cooperation.

96. The joint transmission method of claim 95, wherein, The number of cooperating cooperative entities is configured by an RRC parameter, or the number of cooperating cooperative entities is predefined.

97. The joint transmission method of claim 90, wherein, Multiple TCI states are selected by DCI indication and predefined manner.

98. The joint transmission method of claim 1, wherein, The joint transmission method further comprises receiving configuration information of the number of cooperating streams from the cooperative entity.

99. The joint transmission method of claim 90, wherein, The number of cooperating cooperative entities and the number of streams transmitted by each cooperative entity are indicated by the cooperative entity.

100. The joint transmission method of claim 90, wherein, The number of cooperating cooperative entities is indicated by the cooperative entity, and the number of streams transmitted by each cooperative entity is predefined.

101. The joint transmission method of claim 90, wherein, The number of streams transmitted by multiple sets of cooperative entities is indicated by the cooperative entity through an RRC parameter, and the number of streams actually transmitted by the cooperative entity is indicated by the cooperative entity through a MAC CE or a DCI.

102. The joint transmission method of claim 90, wherein, The number of cooperating cooperative entities is indicated by the cooperative entity, or is predefined, or is selected by the UE, or is determined jointly by the cooperative entity and the UE.

103. A joint transmission method, performed at a user equipment (UE), wherein, The joint transmission method comprises: reporting UE capability to a cooperative entity, wherein the UE capability supports multi-cooperative entity cooperation enhancement, the multi-cooperative entity cooperation enhancement is applied to a scenario of multiple downlink control information (DCI) scheduling multiple cooperative entity cooperation transmission, the number of the multiple cooperative entities is greater than or equal to 2, and the number of the multiple cooperative entities is taken as a capability item of the UE capability; based on the multi-DCI scheduling multiple cooperative entity cooperation transmission, the UE feeds back information to at least one of the cooperative entities.

104. The joint transmission method of claim 103, wherein, The joint transmission method further comprises receiving configuration information sent by the cooperative entity.

105. The joint transmission method of claim 104, wherein, The configuration information is carried on at least one of downlink control information (DCI), radio resource control (RRC) parameters, and a medium access control (MAC) control element (CE) sent by the cooperative entity.

106. The joint transmission method of claim 105, wherein, The configuration information comprises control resource set (CORESET) configuration under a bandwidth part (BWP).

107. The joint transmission method of claim 106, wherein, The number of CORESETs under the BWP and / or the total number of CORESETs of a cell are increased by the CORESET configuration under the BWP.

108. The joint transmission method of claim 104, further comprising receiving one DCI, wherein the DCI is associated with multiple MAC CEs activating TCI states, or the DCI simultaneously selects TCI states corresponding to multiple cooperative entities by a predefined manner.

109. The joint transmission method of claim 104, wherein, For the DCI scheduling multiple cooperating entities, the TCI information indication field in the DCI is associated to multiple TCI states, and the association between the TCI state indicated by the DCI and the TCI state activated by the MAC CE is through the index CORESETPoolIndex of the control resource set pool.

110. The joint transmission method of claim 109, wherein, The MAC CE activates multiple TCI state groups.

111. The joint transmission method of claim 109, wherein, Each CORESET has an associated CORESETPoolIndex.

112. The joint transmission method of claim 104, wherein, One DCI is associated to at least one MAC CE for activating TCI states, and if multiple MAC CEs are configured with the same CORESETPoolIndex, the TCI states activated by the multiple MAC CEs are determined in a predefined manner.

113. The joint transmission method of claim 104, wherein, The TCI information indication field of the DCI indicates multiple TCI states activated by the MAC CEs simultaneously.

114. The joint transmission method of claim 104, wherein, The configuration information further includes PDSCH configuration information.

115. The joint transmission method of claim 114, wherein, The PDSCH interference reduction or elimination configuration increases the number of CDM groups, increases the number of activated BWPs, splits the activated BWPs, and / or increases the scrambling sequence adopted by the PDSCH.

116. The joint transmission method of claim 115, wherein, Different TCI states correspond to different CDM groups, and the number of the CDM groups is equal to Z, where Z is the number of cooperating entities actually participating in cooperation, and 2≤Z≤N.

117. The joint transmission method of claim 115, wherein, When the number of PDSCHs involved in the overlapping part is greater than or equal to 2 or 3, some cooperating entities adopt the same CDM group.

118. The joint transmission method of claim 115, wherein, When the number of cooperating entities is greater than 2 or 3, the cooperating entities are grouped, cooperating entities in the same group are scheduled with the same BWP bandwidth and subcarrier spacing, and cooperating entities in different groups are scheduled with different BWP bandwidths and / or subcarrier spacings.

119. The joint transmission method of claim 115, wherein, When the number of cooperating entities is greater than 2 or 3, the cooperating entities are grouped, and the BWP is divided into multiple sub-BWPs, the number of the sub-BWPs being the same as the number of the cooperating entity groups, cooperating entities in the same group are scheduled with the same sub-BWP under the BWP, and cooperating entities in different groups are scheduled with different sub-BWPs.

120. The joint transmission method of claim 104, wherein, The configuration information further includes hybrid automatic repeat request (HARQ) feedback enhancement configuration.

121. The joint transmission method of claim 120, wherein, The HARQ feedback enhancement configuration increases the number of resources contained in the long format physical uplink control channel (PUCCH) resource set and / or increases the number of long format PUCCH resources contained in each time slot.

122. The joint transmission method of claim 121, wherein, The uplink resources indicated by the multiple cooperating entities are in one time slot or different time slots, and three long format PUCCHs are configured for each time slot, the number of resources contained in the long format PUCCH resource set being a maximum of 16, 24, or 32.

123. A method of joint transmission, performed at a cooperating entity, wherein The joint transmission method comprises: Receiving a UE capability reported by a user equipment (UE), wherein the UE capability supports multiple cooperating entity cooperation enhancement, the multiple cooperating entity cooperation enhancement is applied to a scenario of single downlink control information (DCI) scheduling multiple cooperating entity cooperation transmission, the number of the multiple cooperating entities is greater than or equal to 2, and the number of the multiple cooperating entities is taken as one capability item of the UE capability; Performing joint transmission based on the UE capability.

124. The joint transmission method of claim 123, wherein, The multiple cooperating entities cooperatively transmit includes multi-cooperation entity non-coherent joint transmission and / or multi-cooperation entity partial-coherent joint transmission.

125. The joint transmission method of claim 123, wherein, The multiple cooperation entity cooperative enhancement also supports multi-layer physical downlink shared channel (PDSCH) data transmission, which is one of the UE capabilities.

126. The joint transmission method of claim 123, wherein, The multiple cooperation entity cooperative enhancement also supports one or more of the following multiplexing modes: frequency division multiplexing (FDM) mode, time division multiplexing (TDM) mode, and space division multiplexing (SDM) mode, one or more of the FDM mode, the TDM mode, and the SDM mode being one or more of the UE capabilities.

127. The joint transmission method of claim 126, wherein, The FDM mode includes one or more of single-DCI FDM-A multiplexing mode, single-DCI FDM-B multiplexing mode, the TDM mode includes one or more of single-DCI TDM-A multiplexing mode, single-DCI TDM-B multiplexing mode, and the SDM mode includes single-DCI SDM multiplexing mode.

128. The joint transmission method of claim 127, wherein, In the single-DCI SDM multiplexing mode, the maximum number of cooperating entities is N, and the maximum number of phase tracking reference signal (PTRS) antenna ports is N, N being greater than or equal to 2.

129. The joint transmission method of claim 128, wherein, N is equal to 3 or 4.

130. The joint transmission method of claim 129, wherein, The association relationship between the PTRS antenna port and the demodulation reference signal (DMRS) antenna port is determined based on a predefined mode.

131. The joint transmission method of claim 130, wherein, Each PTRS antenna port is respectively associated with a DMRS antenna port corresponding to the lowest index value of a different transmission configuration indication (TCI) state.

132. The joint transmission method of claim 127, wherein, In the single-DCI FDM-A multiplexing mode, the maximum number of cooperating entities is N, N being greater than or equal to 2, and the frequency domain resources occupied by one PDSCH are divided into at most N groups, each group corresponding to one cooperating entity, and each cooperating entity transmits part of the PDSCH on one frequency domain group belonging to the PDSCH.

133. The joint transmission method of claim 132, wherein, The maximum number of layers of PDSCH transmission supported by the multiple cooperating entities is 4 or 8, and each cooperating entity transmits data of at most 1 or 2 or 4 layers.

134. The joint transmission method of claim 132, wherein, The UE is configured with a maximum of N TCI states in single-DCI, and the actual number of TCI states is equal to the number of cooperating entities.

135. The joint transmission method of claim 134, wherein, The DMRS antenna port of the PDSCH is from one code division multiplexing (CDM) group.

136. The joint transmission method of claim 134, wherein, The DMRS antenna port of the PDSCH is from different CDM groups.

137. The joint transmission method of claim 134, wherein, Wherein, If the precoding matrices used by X consecutive physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, X PRBs are called a physical resource group (PRG), and X takes at least one of {1, 2, 3, 4, 6, 8, 16, full bandwidth}; and / or When X takes at least one of {1, 2, 3, 4, 6, 8, 16, full bandwidth}, the mapping relationship between PDSCH data information and PRBs is determined based on the number of cooperating entities in a predefined manner; and / or Each PDSCH data information is mapped to corresponding frequency domain resources and transmitted by the corresponding cooperating entity or the cooperating entity of the corresponding TCI state.

138. The joint transmission method of claim 137, wherein, Each portion of PDSCH data information is mapped to each portion of PRB in turn according to the index order for transmission, and is sent by the corresponding cooperative entity or the cooperative entity corresponding to the TCI state.

139. The joint transmission method of claim 137, wherein, X PRBs are split into Z portions, Z is the number of cooperative entities actually participating in cooperation, 2≤Z≤N, each portion of PRB contains n consecutive PRBs, and the corresponding portion in each PRG is sent by the corresponding cooperative entity or the cooperative entity corresponding to the TCI state.

140. The joint transmission method of claim 137, wherein, The value of X is configured by a high layer radio resource control (RRC) parameter.

141. The joint transmission method of claim 137, wherein, The value of X is indicated by a medium access control (MAC) control element (CE) or DCI.

142. The joint transmission method of claim 137, wherein, A plurality of candidate values of X are configured by a high layer RRC parameter, and the value of X is indicated according to a MAC CE or DCI.

143. The joint transmission method of claim 127, wherein, In the single-DCI FDM-B multiplexing mode, the frequency domain resources occupied by one PDSCH are divided into Z groups, each group corresponding to one cooperative entity, each cooperative entity transmitting one channel-encoded symbol sequence, Z is the number of cooperative entities actually participating in cooperation, 2≤Z≤N, and the UE supports at least one of {1, 2, 3, 4, 5, 6, 7, 8} layers of data transmission.

144. The joint transmission method of claim 143, wherein, If the precoding matrices used by X consecutive physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, the X PRBs are referred to as one physical resource group (PRG), and X takes at least one of {1, 2, 3, 4, 6, 8, 16, full bandwidth}.

145. The joint transmission method of claim 144, wherein, When X takes at least one of {1, 2, 3, 4, 6, 8, 16, full bandwidth}, the mapping relationship between PDSCH data information and PRB is determined in a predefined manner based on the number of cooperative entities.

146. The joint transmission method of claim 145, wherein, Each portion of PDSCH data information is mapped to corresponding frequency domain resources and is sent by the corresponding cooperative entity or the cooperative entity corresponding to the TCI state.

147. The joint transmission method of claim 145, wherein, Each portion of PDSCH data information is mapped to each portion of PRB in turn according to the index order for transmission, and is sent by the corresponding cooperative entity or the cooperative entity corresponding to the TCI state.

148. The joint transmission method of claim 145, wherein, X PRBs are split into Z portions, Z is the number of cooperative entities actually participating in cooperation, 2≤Z≤N, each portion of PRB contains n consecutive PRBs, and the corresponding portion in each PRG is sent by the corresponding cooperative entity or the cooperative entity corresponding to the TCI state.

149. The joint transmission method of claim 145, wherein, The value of X is configured by a high layer radio resource control (RRC) parameter.

150. The joint transmission method of claim 145, wherein, The value of X is indicated by a medium access control (MAC) control element (CE) or DCI.

151. The joint transmission method of claim 145, wherein, A plurality of candidate values of X are configured by a high layer RRC parameter, and the value of X is indicated according to a MAC CE or DCI.

152. The joint transmission method of claim 127, wherein, In the single-DCI FDM-B multiplexing mode, the frequency domain resources occupied by one PDSCH are divided into Z groups, each group corresponding to one cooperative entity, each cooperative entity transmitting one channel-encoded symbol sequence, Z is the number of cooperative entities actually participating in cooperation, 2≤Z≤N, and the UE supports at least one of {1, 2, 3, 4, 5, 6, 7, 8} layers of data transmission.

153. The joint transmission method of claim 127, wherein, In the single-DCI TDM-A multiplexing mode, time-domain resources occupied by one PDSCH in one or two slots are divided into at most N groups, each group corresponding to one cooperating entity, each cooperating entity transmitting a PDSCH transmission block with time-domain repetition, and the multiple repeated PDSCH data blocks occupying the same frequency-domain resources. And / or the number of slots occupied by the multiple PDSCH transmissions is configured by one or more of RRC, MAC CE, and DCI, and the value is at least one of {1, 2}.

154. The joint transmission method of claim 127, wherein, In the single-DCI TDM-A multiplexing mode, time-domain resources occupied by one PDSCH in one or two slots are divided into at most N groups, each group corresponding to one cooperating entity, each cooperating entity transmitting a PDSCH transmission block with time-domain repetition, and the multiple repeated PDSCH data blocks occupying the same frequency-domain resources.

155. The joint transmission method of claim 154, wherein, The number of repeated transmissions of the PDSCH transmission block is any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}.

156. The joint transmission method of claim 154, wherein, The number of repeated transmissions of the PDSCH transmission block is configured by one or more of RRC, MAC CE, and DCI.

157. The joint transmission method of claim 154, wherein, The time-domain repetition transmission adopts a sequential mapping or a cyclic mapping mode, the sequential mapping mode refers to at least one cooperating entity transmitting repeated PDSCH information in two or three consecutive slots, and the repeated PDSCH information corresponds to the same TCI state, and the cyclic mapping mode refers to multiple cooperating entities transmitting PDSCH transmission blocks by alternately changing TCI states, and the granularity of TCI change is one PDSCH transmission opportunity, and when all cooperating entities are traversed, the above process is repeated.

158. The joint transmission method of claim 127, wherein, In the single-DCI FDM and TDM multiplexing mode, one PDSCH is supported to be transmitted in the FDM-A and TDM multiplexing mode.

159. The joint transmission method of claim 158, wherein, The PDSCH information transmitted by different cooperating entities is respectively associated with different TCI states.

160. The joint transmission method of claim 158, wherein, The PDSCH information corresponding to different frequency-domain resources under the same time-domain resource belongs to one PDSCH transmission block and adopts the same redundancy version RV value.

161. The joint transmission method of claim 158, wherein, The PDSCH transmitted on different frequency-domain resources has the same time-domain repetition interval.

162. The joint transmission method of claim 127, wherein, In the single-DCI FDM and TDM multiplexing mode, one PDSCH is supported to be transmitted in the FDM-B and TDM multiplexing mode.

163. The joint transmission method of claim 162, wherein, The PDSCH information mapped on the multiple parts of frequency-domain resources adopts different channel coding modes.

164. The joint transmission method of claim 162, wherein, The multiple PDSCH transmission blocks with the same time domain and different frequency domains adopt different RV values.

165. The joint transmission method of claim 162, wherein, The multiple PDSCH transmission blocks with different time domains and the same frequency domain adopt the same RV value or different RV values.

166. The joint transmission method of claim 127, wherein, In the single-DCI FDM and TDM multiplexing manner, if precoding matrices used by X continuous physical resource blocks (PRBs) in the frequency domain are the same, X is the granularity of precoding, the X PRBs are referred to as a physical resource group (PRG), and X takes at least one of values in a set {1, 2, 3, 4, 6, 8, 16, and a full bandwidth}.

167. The joint transmission method of claim 166, wherein, When X takes at least one of values in the set {1, 2, 3, 4, 6, 8, 16, and a full bandwidth}, a mapping relationship between PDSCH data information and PRBs is determined in a predefined manner based on a number of cooperation entities.

168. The joint transmission method of claim 167, wherein, Each piece of PDSCH data information is mapped to a corresponding frequency domain resource and is transmitted by a corresponding cooperation entity or a cooperation entity corresponding to a TCI state.

169. The joint transmission method of claim 167, wherein, Each piece of PDSCH data information is sequentially mapped to each part of a PRB in an index order and is transmitted by a corresponding cooperation entity or a cooperation entity corresponding to a TCI state.

170. The joint transmission method of claim 167, wherein, X PRBs are split into Z parts, Z is a number of cooperation entities actually participating in cooperation, 2≤Z≤N, each part of the PRBs includes n continuous PRBs, and a corresponding part in each PRG is transmitted by a corresponding cooperation entity or a cooperation entity corresponding to a TCI state.

171. The joint transmission method of claim 167, wherein, A value of X is configured through a high-layer radio resource control (RRC) parameter.

172. The joint transmission method of claim 127, wherein, In the single-DCI FDM and TDM multiplexing manner, one PDSCH is supported to be transmitted in an FDM-different layer and TDM multiplexing manner, where the FDM-different layer refers to different layers or layer groups of PDSCH information transmitted in different frequency domain resources under the same frequency domain resource.

173. The joint transmission method of claim 172, wherein, PDSCH information transmitted by different cooperation entities is respectively associated with different TCI states.

174. The joint transmission method of claim 172, wherein, PDSCHs transmitted in different frequency domain resources under the same frequency domain resource are configured with the same RV value.

175. The joint transmission method of claim 172, wherein, Different RV values are adopted for PDSCHs repeatedly transmitted in the same frequency domain resource and different frequency domain resources.

176. The joint transmission method of claim 175, wherein, An RV value is indicated through an RV indication field of DCI.

177. The joint transmission method of claim 127, wherein, In the single-DCI FDM and TDM multiplexing manner, one PDSCH is supported to be transmitted in an FDM and TDM-B multiplexing manner.

178. The joint transmission method of claim 177, wherein, The FDM multiplexing manner includes one or more of an FDM-A multiplexing manner, an FDM-B multiplexing manner, and an FDM-different layer and TDM multiplexing manner, where the FDM-different layer refers to different layers or layer groups of PDSCH information transmitted in different frequency domain resources under the same frequency domain resource.

179. The joint transmission method of claim 127, wherein, In the single-DCI SDM and TDM multiplexing manner, the TDM multiplexing manner includes one or more of a TDM-A multiplexing manner and a TDM-B multiplexing manner.

180. The joint transmission method of claim 179, wherein, In the single-DCI SDM and TDM-A multiplexing manner, time domain resources occupied by one PDSCH in one or two slots are divided into at most N groups in the time domain, each group corresponds to one cooperation entity, each cooperation entity transmits a PDSCH transmission block repeatedly in different time domains, and multiple repeated PDSCH data blocks occupy the same frequency domain resource.

181. The joint transmission method of claim 180, wherein, A number of slots occupied by multiple PDSCH transmissions is configured through one or more of an RRC, a MAC CE, and DCI, and takes at least one of values in a set {1, 2}.

182. The joint transmission method of claim 179, wherein, In the single-DCI SDM and TDM-B multiplexing mode, the time domain resources occupied by one PDSCH in one or two slots are divided into a maximum of N groups in the time domain, each group corresponding to one cooperating entity, and each cooperating entity transmits the PDSCH transport block through repeated transmission between slots, and the multiple repeated PDSCH data blocks occupy the same frequency domain resources.

183. The joint transmission method of claim 182, wherein, The number of repeated transmissions of the PDSCH transport block is any one of {2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24}.

184. The joint transmission method of claim 60, wherein, The number of repeated transmissions of the PDSCH transport block is configured through one or more of RRC, MAC CE, and DCI.

185. The joint transmission method of claim 182, wherein, The repeated transmission between slots adopts a sequential mapping or a cyclic mapping mode, the sequential mapping mode refers to at least one cooperating entity transmitting repeated PDSCH information in two or three consecutive slots, and the repeated PDSCH information corresponds to the same TCI state, and the cyclic mapping mode refers to multiple cooperating entities transmitting PDSCH transport blocks through different TCI states alternately, and the granularity of TCI change is one PDSCH transmission opportunity, and when all cooperating entities are traversed, the above process is repeated.

186. The joint transmission method of claim 179, wherein, In the single-DCI SDM and TDM-A multiplexing mode, different cooperating entities or TCI states are used for data retransmission.

187. The joint transmission method of claim 123, wherein, The joint transmission method further comprises: Receiving configuration information sent by the cooperating entity, the configuration information including configuration of measurement resources.

188. The joint transmission method of claim 187, wherein, The measurement resources corresponding to the multiple cooperating entities belong to one measurement resource set.

189. The joint transmission method of claim 187, wherein, The measurement resources corresponding to the multiple cooperating entities belong to multiple measurement resource sets.

190. The joint transmission method of claim 187, wherein, One or more measurement resource sets group multiple resources according to different cooperating transmission modes.

191. The joint transmission method of claim 187, wherein, One or more measurement resource sets divide resource subsets according to different cooperating transmission modes.

192. The joint transmission method of claim 187, wherein, One measurement resource corresponds to multiple cooperating entities.

193. The joint transmission method of claim 187, wherein, One cooperating entity corresponds to multiple measurement resources.

194. The joint transmission method of claim 187, wherein, Each cooperating entity corresponds to one measurement resource set, and each measurement resource set contains at least one channel state information-reference signal (CSI-RS) resource, and the multiple CSI-RS resources are configured with the same number of antenna ports or different numbers of antenna ports.

195. The joint transmission method of claim 194, wherein, The relationship between the cooperating entity and the CSI-RS resource is one-to-one, one-to-many, or many-to-one.

196. The joint transmission method of claim 187, wherein, The multiple CSI-RS resources under the same resource group correspond to antenna modules that use coherent joint transmission or non-coherent joint transmission.

197. The joint transmission method of claim 187, wherein, Each cooperating entity is configured with at least one CSI-RS resource set for channel measurement, and each CSI-RS resource set contains at least one CSI-RS resource.

198. The joint transmission method of claim 197, wherein, The multiple antenna modules associated with the CSI-RS resources in each CSI-RS resource set use coherent joint transmission or non-coherent joint transmission.

199. The joint transmission method of claim 187, wherein, CSI-RS resource subsets are configured in the CSI-RS resource set, each CSI-RS resource subset contains at least one CSI-RS resource, and the antenna port numbers of the CSI-RS resources in the CSI-RS resource subset are the same or different.

200. The joint transmission method of claim 187, wherein, The multiple CSI-RS resources in the CSI-RS resource subset are subjected to coherent joint transmission or non-coherent joint transmission.

201. The joint transmission method of claim 187, wherein, In the coherent transmission mode, the CSI corresponding to part of the channel measurement resources is jointly fed back or independently fed back to one of the cooperating entities.

202. The joint transmission method of claim 187, wherein, At least one cooperating entity serving the same UE configures a channel measurement resource set, which contains at least one channel measurement resource, and the multiple channel measurement resources under the channel measurement resource set are divided into multiple channel measurement resource groups, and the number of channel measurement resources in each channel measurement resource group is the same or different, and the antenna ports corresponding to each resource are the same or different.

203. The joint transmission method of claim 123, wherein, The joint transmission method further includes selection of the cooperating cluster.

204. The joint transmission method of claim 203, wherein, The selection of the cooperating cluster includes that the cooperating entity configures the number of cooperating entities to the UE for selection of the cooperating cluster.

205. The joint transmission method of claim 203, wherein, The selection of the cooperating cluster is based on a predefined condition.

206. The joint transmission method of claim 203, wherein, The selection of the cooperating cluster is based on selection of part or all of the cooperating entities from the number of cooperating entities configured by the cooperating entity.

207. The joint transmission method of claim 203, wherein, The number of cooperating entities is indicated by the cooperating entity, determined by the UE, or jointly determined.

208. The joint transmission method of claim 203, wherein, The selection of the cooperating cluster is based on selection of at least one antenna array / panel from multiple antenna arrays / panels connected to the same cooperating entity for signal transmission between the UE.

209. The joint transmission method of claim 207, wherein, Finally, only one cooperating entity communicates with the UE.

210. The joint transmission method of claim 207, wherein, The cooperating entity selects one channel measurement result from the channel measurement results of the channel measurement resources corresponding to multiple antenna arrays / panels of the UE for transmission of downlink information.

211. The joint transmission method of claim 203, wherein, The selection of the cooperating cluster is based on selection of at least two antenna arrays / panels from multiple antenna arrays / panels connected to the same cooperating entity for coherent or non-coherent joint transmission of signals between the UE.

212. The joint transmission method of claim 123, wherein, The joint transmission method further includes receiving an indication of a TCI state from the cooperating entity.

213. The joint transmission method of claim 212, wherein, A TCI state group containing multiple TCI states is activated by a MAC CE.

214. The joint transmission method of claim 213, wherein, The MAC CE activates up to 8 TCI state groups, and each TCI state group contains one to N TCI states.

215. The joint transmission method of claim 213, wherein, When the number of cooperating cooperating entities is greater than two, two TCI information indication fields are configured.

216. The joint transmission method of claim 213, wherein, The MAC CE activates up to K TCI state groups, and each TCI state group contains one to two TCI states, and the TCI state used by the PDSCH is indicated by the DCI, and when the number of cooperating cooperating entities is greater than two, the TCI information indication field indicates at least one TCI state group.

217. The joint transmission method of claim 213, wherein, When the number of cooperating cooperating entities is greater than one, the Y TCI states with the smallest TCI state ID number are activated by the MAC CE, and Y is the number of actual cooperating cooperating entities.

218. The joint transmission method of claim 216, wherein, The number of cooperating cooperating entities is configured by an RRC parameter, or the number of cooperating cooperating entities is predefined.

219. The joint transmission method of claim 212, wherein, Multiple TCI states are selected by DCI indication and predefined method.

220. The joint transmission method of claim 123, wherein, The joint transmission method further includes sending configuration information of the number of cooperating streams to the UE.

221. The joint transmission method of claim 212, wherein, The number of cooperating entities of the cooperation is indicated by the cooperating entities, and the number of streams transmitted by each cooperating entity is predefined.

222. The joint transmission method of claim 212, wherein, The number of cooperating entities of the cooperation is indicated by the cooperating entities, and the number of streams transmitted by each cooperating entity is predefined.

223. The joint transmission method of claim 212, wherein, The number of streams transmitted by multiple sets of cooperating entities is indicated by the cooperating entities through RRC parameters, and the actual number of streams transmitted by the cooperating entities is indicated by the cooperating entities through MAC CEs or DCIs.

224. The joint transmission method of claim 212, wherein, The number of cooperating entities of the cooperation is indicated by the cooperating entities, or is predefined, or is selected by the UE, or is determined jointly by the cooperating entities and the UE.

225. A method of joint transmission, executed at a cooperating entity, wherein The joint transmission method comprises: Receiving UE capability reported by a user equipment (UE), wherein the UE capability supports multi-cooperating entity cooperation enhancement, the multi-cooperating entity cooperation enhancement is applied to a scenario of multiple downlink control information (DCI) scheduling multiple cooperating entity cooperation transmission, the number of the multiple cooperating entities is greater than or equal to 2, and the number of the multiple cooperating entities is taken as a capability item of the UE capability. Performing joint transmission based on the UE capability.

226. The joint transmission method of claim 225, wherein, The joint transmission method further comprises sending configuration information to the UE.

227. The joint transmission method of claim 226, wherein, The configuration information is carried on at least one of downlink control information (DCI), radio resource control (RRC) parameters, and a medium access control (MAC) control element (CE) sent by the cooperating entity.

228. The joint transmission method of claim 227, wherein, The configuration information comprises control resource set (CORESET) configuration under a bandwidth part (BWP).

229. The joint transmission method of claim 228, wherein, The number of CORESETs under the BWP and / or the total number of CORESETs of a cell are increased through the CORESET configuration under the BWP.

230. The joint transmission method according to claim 226, further comprising receiving a DCI associated with multiple MAC CEs activating TCI states or determining the DCI simultaneously selecting multiple cooperating entity corresponding TCI states through a predefined manner.

231. The joint transmission method of claim 226, wherein, For the DCI scheduling multiple cooperating entities, a TCI information indication field in the DCI is associated with multiple TCI states, and the TCI states indicated by the DCI and the TCI states activated by the MAC CEs are associated through a control resource set pool index (CORESETPoolIndex).

232. The joint transmission method of claim 231, wherein, The MAC CEs activate multiple TCI state groups.

233. The joint transmission method of claim 231, wherein, Each CORESET has an associated CORESETPoolIndex.

234. The joint transmission method of claim 226, wherein, One DCI is associated with at least one MAC CE for activating TCI states, and if multiple MAC CEs are configured with the same CORESETPoolIndex, the TCI states activated by the multiple MAC CEs are determined through a predefined manner.

235. The joint transmission method of claim 226, wherein, The TCI information indication field of the DCI simultaneously indicates multiple TCI states activated by the MAC CEs.

236. The joint transmission method of claim 226, wherein, The configuration information further comprises PDSCH configuration information.

237. The joint transmission method of claim 236, wherein, The number of CDM groups, the number of activated BWPs, the splitting of the activated BWPs, and / or the scrambling sequences adopted by the PDSCH are increased through the PDSCH configuration information.

238. The joint transmission method of claim 237, wherein, Different TCI states correspond to different CDM groups, the number of the CDM groups is equal to Z, Z is the number of the actual participating cooperation entities, 2≤Z≤N.

239. The joint transmission method of claim 237, wherein, When the number of PDSCHs involved in the overlapping part is greater than or equal to 2 or 3, the partial cooperation entities adopt the same CDM group.

240. The joint transmission method of claim 237, wherein, When the number of cooperation entities is greater than 2 or 3, the cooperation entities are grouped, the cooperation entities in the same group are scheduled with the same BWP bandwidth and subcarrier spacing, and the cooperation entities in different groups are scheduled with different BWP bandwidth and / or subcarrier spacing.

241. The joint transmission method of claim 237, wherein, When the number of cooperation entities is greater than 2 or 3, the cooperation entities are grouped, and the BWP is divided into a plurality of sub-BWPs, the number of the sub-BWPs is the same as the number of the cooperation entity groups, the cooperation entities in the same group are scheduled with the same sub-BWP under the BWP, and the cooperation entities in different groups are scheduled with different sub-BWPs.

242. The joint transmission method of claim 226, wherein, The configuration information further comprises a hybrid automatic repeat request (HARQ) feedback enhancement configuration.

243. The joint transmission method of claim 242, wherein, The number of resources contained in the long format physical uplink control channel (PUCCH) resource set is increased and / or the number of long format PUCCH resources contained in each time slot is increased through the HARQ feedback enhancement configuration.

244. The joint transmission method of claim 243, wherein, The uplink resources indicated by the plurality of cooperation entities are in one time slot or different time slots, three long format PUCCHs are configured in each time slot, and the number of resources contained in the long format PUCCH resource set is 16, 24, or 32 at most.

245. A user equipment (UE), comprising: A processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in any one of 1 to 122.

246. A cooperating entity, comprising: A processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in any one of 123 to 244.

247. A wireless communication device, comprising: A processor and a memory, the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in any one of 1 to 244.

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