Communication device, base station, and method and integrated circuit therefor

Abstract

The invention relates to a communication device, a base station, and a method and an integrated circuit therefor. In one embodiment, a communication device includes circuitry to determine one or more transmission parameters based on one or more indicators and a configuration associated with a transmission configuration indication (TCI) field; a transceiver that performs transmission or reception using one or more transmission parameters, determines the one or more transmission parameters by using a first table in a case where the configuration associated with the TCI field is for a single TCI situation, and determines the one or more transmission parameters by using a second table in a case where the configuration associated with the TCI field is for a multi-TCI situation. One or more transmission parameters are determined by using a second table, and the indexes in the second table are indicated by the same number of bits for indicating the indexes in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

Description

[0001] This application is a divisional application of the Chinese invention patent application with application date of November 12, 2019 and application number 201980040677.9. Technical Field

[0002] The present disclosure relates to the transmission and reception of signals in a communication system. In particular, the present disclosure relates to methods and devices for such transmission and reception. Background Art

[0003] The 3rd Generation Partnership Project (3GPP) is working on the technical specifications for the next generation of cellular technology, also known as the fifth generation (5G), including the "New Radio" (NR) radio access technology (RAT), which operates in the frequency range up to 100 GHz. NR is a follower of the technologies represented by Long Term Evolution (LTE) and LTE-Advanced (LTE-A).

[0004] For systems like LTE and NR, further improvements and options may facilitate efficient operation of the communication system as well as specific devices belonging to the system. Summary of the invention

[0005] One non-limiting and exemplary embodiment facilitates physical downlink control channel (PDCCH) signaling for multiple transmit and receive point (TRP) communications.

[0006] In one general aspect, the technology disclosed herein features a user equipment (UE) comprising: a transceiver that receives downlink control information (DCI) on a physical downlink control channel (PDCCH) for scheduling multiple transmissions or receptions between the UE and multiple transmission and reception points (TRPs) on multiple channels, the DCI including one or more indicators indicating one or more corresponding transmission parameters; and a circuit that obtains multiple values ​​of the one or more transmission parameters based on the one or more indicators and based on a configuration, wherein the transceiver performs the multiple transmissions or receptions using a corresponding one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0007] In one general aspect, the technology disclosed herein is characterized by a user equipment UE, comprising: a transceiver, receiving downlink control information DCI on a physical downlink control channel PDCCH, the DCI including one or more indicators indicating one or more corresponding transmission parameters; and a circuit, based on the one or more indicators, obtaining multiple values ​​of the one or more transmission parameters respectively; wherein the transceiver uses a corresponding one of the multiple values ​​of the one or more transmission parameters for each of multiple transmissions or receptions to perform the multiple transmissions or receptions, and wherein the one or more transmission parameters include at least one of a demodulation reference signal DMRS port indication and a transmission configuration indication TCI state.

[0008] In a general aspect, the technology disclosed herein is characterized by a communication method for a user equipment, comprising: receiving downlink control information DCI on a physical downlink control channel PDCCH, the DCI including one or more indicators indicating one or more corresponding transmission parameters; based on the one or more indicators and based on a configuration, obtaining multiple values ​​of the one or more transmission parameters respectively; and performing the multiple transmissions or receptions using a corresponding one of the multiple values ​​of the one or more transmission parameters for each of a plurality of transmissions or receptions, and wherein the one or more transmission parameters include at least one of a demodulation reference signal DMRS port indication and a transmission configuration indication TCI state.

[0009] In one general aspect, the technology disclosed herein is characterized by an integrated circuit that controls processing of a user equipment UE, the processing comprising: receiving downlink control information DCI on a physical downlink control channel PDCCH, the DCI comprising one or more indicators indicating one or more corresponding transmission parameters; obtaining multiple values ​​of the one or more transmission parameters respectively based on the one or more indicators and based on a configuration; and performing the multiple transmissions or receptions using a corresponding one of the multiple values ​​of the one or more transmission parameters for each of a plurality of transmissions or receptions, and wherein the one or more transmission parameters comprise at least one of a demodulation reference signal DMRS port indication and a transmission configuration indication TCI state.

[0010] In one general aspect, the technology disclosed herein is characterized by a communication device, comprising: a circuit that determines one or more transmission parameters based on one or more indicators and a configuration associated with a transmission configuration indication (TCI) field; a transceiver that uses the one or more transmission parameters to perform transmission or reception, and when the configuration associated with the TCI field is for a single TCI case, the one or more transmission parameters are determined by using a first table, and when the configuration associated with the TCI field is for a multiple TCI case, the one or more transmission parameters are determined by using a second table, and the index in the second table is indicated by the same number of bits used to indicate the index in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

[0011] In one general aspect, the technology disclosed herein is characterized by a base station comprising: a circuit that determines one or more transmission parameters and generates downlink control information DCI for scheduling transmission or reception using the one or more transmission parameters, the DCI including one or more indicators and a transmission configuration indication TCI field; a transceiver that sends the DCI and performs transmission or reception, and in a case where the configuration associated with the TCI field is for a single TCI case, the one or more transmission parameters are determined by using a first table, and in a case where the configuration associated with the TCI field is for a multiple TCI case, the one or more transmission parameters are determined by using a second table, and the index in the second table is indicated by the same number of bits used to indicate the index in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

[0012] In a general aspect, the technology disclosed herein is characterized by a communication method for a communication device, comprising: determining one or more transmission parameters based on one or more indicators and a configuration associated with a transmission configuration indication (TCI) field; and performing sending or receiving using the one or more transmission parameters, and in a case where the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, and in a case where the configuration associated with the TCI field is for a multiple TCI case, determining the one or more transmission parameters by using a second table, and an index in the second table is indicated by the same number of bits used to indicate an index in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

[0013] In a general aspect, the technology disclosed herein is characterized by a communication method for a base station, comprising: determining one or more transmission parameters and generating downlink control information DCI for scheduling transmission or reception using the one or more transmission parameters, the DCI including one or more indicators and a transmission configuration indication TCI field; sending the DCI and performing transmission or reception, in a case where the configuration associated with the TCI field is for a single TCI case, the one or more transmission parameters are determined by using a first table, and in a case where the configuration associated with the TCI field is for a multiple TCI case, the one or more transmission parameters are determined by using a second table, and the index in the second table is indicated by the same number of bits used to indicate the index in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

[0014] In one general aspect, the technology disclosed herein is characterized by an integrated circuit that controls a process of a communication device, the process including: determining one or more transmission parameters based on one or more indicators and a configuration associated with a transmission configuration indication (TCI) field; and performing sending or receiving using the one or more transmission parameters, and in a case where the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, and in a case where the configuration associated with the TCI field is for a multiple TCI case, determining the one or more transmission parameters by using a second table, and an index in the second table is indicated by the same number of bits used to indicate an index in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

[0015] In one general aspect, the technology disclosed herein is characterized by an integrated circuit that controls a process of a base station, the process comprising: determining one or more transmission parameters and using the one or more transmission parameters to generate downlink control information DCI for scheduling transmission or reception, the DCI comprising one or more indicators and a transmission configuration indication TCI field; sending the DCI and performing transmission or reception, when the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, and when the configuration associated with the TCI field is for a multiple TCI case, determining the one or more transmission parameters by using a second table, and the index in the second table is indicated by the same number of bits used to indicate the index in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

[0016] It should be noted that the general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

[0017] Other benefits and advantages of the disclosed embodiments will become apparent from the description and drawings. Benefits and / or advantages may be obtained individually from various embodiments and features of the description and drawings, and all of these embodiments and features do not need to be provided in order to obtain one or more such benefits and / or advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Hereinafter, exemplary embodiments are described in more detail with reference to the accompanying drawings and figures.

[0019] Figure 1 An exemplary architecture of a 3GPP NR system is shown, including exemplary user and control plane architectures for LTE eNBs, gNBs, and UEs;

[0020] Figure 2 An exemplary diagram showing transmission of two PDSCHs to a single UE is shown;

[0021] Figure 3 An exemplary diagram showing a single PDCCH transmission from one TRP scheduling two PDCCH transmissions from two TRPs;

[0022] Figure 4 is a graph showing a configuration of a pre-demodulation reference symbol of a data channel;

[0023] Figure 5 is a block diagram showing the structure of a UE and a network node;

[0024] Figure 6 is a flow chart illustrating a method for a UE and a method for a network node;

[0025] Figure 7 is a block diagram showing an exemplary structure of a UE parameter acquisition circuit;

[0026] Figure 8 is a block diagram showing an exemplary structure of a UE parameter acquisition circuit;

[0027] Fig. 9 is an example of an RRC code including values ​​of a multi-TRP combination table;

[0028] Fig.10 is an example of an RRC code including values ​​of a multi-TRP combination table for DMRS indication;

[0029] Fig.11 is an example of an RRC code including a value of a multi-TRP combination table for TCI status indication;

[0030] Fig.12 is an example of an RRC code including an enabling parameter for a multi-TRP combination table;

[0031] Fig.13 is an example of an enabling parameter RRC code including a multi-TRP combination table for DMRS indication;

[0032] Fig.14 is an example of an RRC code including enabling parameters for a multi-TRP combination table for TCI status indication. DETAILED DESCRIPTION

[0033] Figure 1 An example of a communication system including a base station and a terminal and a core network is shown. Such a communication system may be a 3GPP system, such as NR and / or LTE and / or UMTS. For example, Figure 1 As shown, the base station (BS) can be a gNB (gNodeB, such as NR gNB) or an eNB (eNodeB, such as LTE gNB). However, the present disclosure is not limited to these 3GPP systems or any other system. Although the embodiments and exemplary implementations are described using some terms of the 3GPP system, the present disclosure is also applicable to any other communication system, in particular any cellular, wireless and / or mobile system.

[0034] The NR plan helps provide a single technology framework that addresses several defined use cases, requirements, and deployment scenarios, including, for example, enhanced mobile broadband (eMBB), ultra-reliable low latency communications (URLLC), massive machine type communications (mMTC), etc. For example, eMBB deployment scenarios may include indoor hotspots, dense cities, rural areas, urban macro cells, and highways; URLLC deployment scenarios may include industrial control systems, mobile health (remote monitoring, diagnosis, and treatment), vehicle real-time control, and wide-area monitoring systems for smart grids; mMTC may include scenarios with a large number of devices with non-time-critical data transmission, such as smart wearable devices and sensor networks. The similarity between eMBB and URLLC services is that they both require very wide bandwidth, but the difference is that URLLC services require ultra-low latency. In NR, the physical layer is based on time-frequency resources (such as orthogonal frequency division multiplexing (OFDM) in LTE) and can support multi-antenna operation.

[0035] In LTE and NR, the terminal is called user equipment (UE). This can be a mobile device such as a wireless phone, smartphone, tablet or USB (Universal Serial Bus) stick with user equipment functionality. However, the term mobile device is not limited to this, and in general, a relay can also have the functionality of such a mobile device, and a mobile device can also act as a relay.

[0036] A base station is a network node, for example, a network node forming part of a network providing services to terminals. A base station is a network node providing wireless access to terminals.

[0037] The physical layer in NR may provide multi-antenna operation, such as multiple-input multiple-output (MIMO), which may, for example, include the use of plural or multiple transmit and receive points (multiple TRPs). For example, a user equipment may receive data from several TRPs, where the several TRPs may be controlled by the same or different network nodes. The terms multi-point transmission or coordinated multi-point transmission (CoMP) may also be used for multi-TRP communications including multi-TRP transmissions.

[0038] In New Radio (NR) Rel.15 of the 3rd Generation Partnership Project (3GPP), basic support for multiple transmit and receive points (multi-TRP) is specified. In NR Rel.16, multi-TRP can be further enhanced according to a new work item on NR MIMO (see, RP-182067, 'Revised WID (work item description): Enhancements on MIMO for NR', Samsung, 3GPP TSG RAN (Technical Specification Group Radio Access Network) Meeting #81, Gold Coast, Australia, September 10-13, 2018).

[0039] The present disclosure relates to multi-TRP communications and proposes, for example, techniques related to a single physical downlink control channel (PDCCH) transmission, where a single PDCCH is used to schedule data or control channels for multiple TRPs, such as a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH). Some of the techniques discussed are related to a demodulation reference signal (DMRS) port indication table for mapping DMRS ports to multiple layers for transmission on multiple TRPs and transmission configuration indication (TCI) status signaling for multiple TRPs. Signaling modifications related to both DMRS port indication and TCI status for multiple TRP transmission / reception for data channels via a single PDCCH are discussed.

[0040] As described above, the present disclosure is applicable to the field of multi-TRP in MIMO. Multi-TRP includes transmission / reception from / to multiple points, which are connected to each other via ideal or non-ideal backhaul, which will be described in more detail below, for coordinating transmission and / or reception to some extent.

[0041] The techniques described in this disclosure are not limited to a specific TRP arrangement, or a specific relationship between a TRP and a gNB. Thus, for example, multi-TRP operation may be performed by a gNB having different antenna panels or radio heads corresponding to the TRPs and different radio frequency units operating with the corresponding antennas.

[0042] In addition, in multiple TRPs, there may be several options regarding the positional relationship between TRPs, and the distance between two TRPs may vary. For example, the TRPs may be close so that the UE receives signals from these TRPs from similar angles. However, the TRPs may also be far apart from each other, for example, at a distant location of a network cell. A UE served by two TRPs may receive and send signaling from and to the corresponding TRPs on unrelated channels. Therefore, the gain of channel diversity can be optimally utilized.

[0043] For example, multiple TRPs can be divided into two high-level categories. That is, the categories can be distinguished based on the backhaul type of the backhaul link between two given TRPs. On the one hand, an ideal backhaul is a very high throughput and very low latency backhaul, such as a dedicated point-to-point connection using, for example, optical fiber. It is assumed that the ideal backhaul allows communication between TRPs with approximately or almost 0ms latency (for example, for LTE-A, the technical report 3GPP TR 36.932 V15.0.0 (2018-06) mentions a one-way latency of less than 2.5us in section 6.1.3, but this does not include propagation delays in optical fiber / cables). On the other hand, non-ideal backhauls are backhauls such as digital subscriber lines (DSL), microwaves, and other similar relays, and for communication between two given TRPs, may involve limited (one-way) delays in the range of 2ms or 5ms, for example.

[0044] In addition to the classification into ideal backhaul and non-ideal backhaul, additional classification in multi-TRP MIMO technology can be made for how the baseband circuit is shared between TRPs. For example, although each of two given TRPs has a different radio frequency (RF) block, the TRPs can share the same baseband circuit. Wherein, the link / backhaul between the RF block and the baseband circuit can be ideal or non-ideal. Alternatively, for each TRP, there can be a different baseband and a different RF block. Wherein, the corresponding link between the baseband circuit and the RF block and the link between different baseband circuits can be ideal or non-ideal.

[0045] The present disclosure provides methods that can facilitate multi-TRP operation and, in particular, reliability and robustness. The disclosed techniques can facilitate meeting URLLC requirements, for example, by utilizing multi-TRP communications, but are not limited to URLLC use cases. For example, the disclosed techniques can also be applied to eMBB and mMTC use cases. The present disclosure can be applied to scenarios including one or both of ideal and non-ideal backhaul.

[0046] As described above, multiple widely spaced TRPs can provide spatial diversity gains. Utilization of these spatial diversity gains can particularly facilitate transmission and reception in high frequency ranges, where blocking of any link or wireless communication channel between a TRP and a UE is particularly likely. In view of this, the techniques disclosed herein can facilitate coordination between multiple points (such as TRPs) to schedule control channels and / or data channels.

[0047] Figure 2 An example of multi-TRP communication is shown, where multiple physical downlink data channels are sent from two TRPs (eg, which are connected via an ideal backhaul) to a single UE.

[0048] Multiple TRPs can have different transmission modes, depending on how the backhaul links between the TRPs are configured and whether each TRP has its own control channel (PDCCH / PUCCH) and / or data channel (PDSCH / PUSCH).

[0049] According to some agreements of RAN1#94b and RAN#95, different alternatives related to single and / or multiple PDCCH transmission for multi-TRP transmission are being considered, and it is agreed to select downward among the following options: supporting only a single PDCCH design (where multiple PDCCH designs can be additionally provided); supporting only multiple PDCCH designs (where a single PDCCH design can be additionally provided); and supporting multiple PDCCHs and a single PDCCH design. As an alternative, the design of the URLLC for a specific PDCCH can be designed, which may include a specific PDCCH structure / format or transmission scheme. Aspects to be considered in the downward selection may include return latency, downlink control overhead, specification impact (including RAN2 specifications), UE complexity (related to power control, timing adjustment and blind detection), DCI / UCI design, scheduler flexibility, PUCCH / PUSCH transmission within the UE, Rel-15 PDCCH blocking probability and CSI feedback.

[0050] The present disclosure may be applicable to a single PDCCH transmission in multiple TRPs. However, the PDCCH may schedule, for example, PDSCH / PUSCH / PUCCH for multiple TRPs. Figure 3As shown, a single PDCCH (single DCI content) is sent from TRP1 to the UE, and it schedules corresponding PDSCHs (carrying corresponding codewords) sent from TRP1 and TRP2 to the UE. This means that a single DCI content within a single PDCCH is applied to downlink data transmission from both TRPs. Therefore, one PDCCH sent from one of the TRPs schedules different codewords (different PDCCHs). For example, the corresponding codewords sent to or received by two or more TRPs can be different or the same (for example, to help achieve spatial diversity gain). In addition, different layers of the same codeword can be sent from multiple TRPs.

[0051] In NR Rel.15, different demodulation reference signal (DMRS) configurations are specified for PDSCH / PUSCH, which are called leading DMRS because they occupy the first one or two symbols of the data channel, for example, the first one or more symbols of a time slot. Specifically, DMRS configuration type 1 and type 2 are specified. Each configuration has a one-symbol and two-symbol configuration. Therefore, 4 different DMRS modes are specified, such as Figure 4 In addition, other time domain modes with additional DMRS symbols are also specified.

[0052] A reference signal (RS) pattern is sent from an antenna port (or port or DMRS port) of a base station. A port can be implemented as a single physical transmit antenna (or TRP), or as a combination of multiple physical antenna elements. In either case, the signal sent from each antenna port is not designed to be further deconstructed by the UE receiver: the transmitted RS (in particular the demodulation reference signal) corresponding to a given antenna port triggers the definition of the antenna port from the UE's perspective, and enables the UE to derive a channel estimate for all data sent on that antenna port, regardless of whether it represents a single radio channel from one physical antenna or a composite channel from multiple physical antenna elements (including the antenna port together). Regarding ports, see also section 8.2 of LTE: The UMTS Long Term Evolution, 2nd edition, by S. Sesia, I. Toufik and M, Baker.

[0053] Different ports can be distinguished from each other by resource components such as cyclic shift, comb (the comb defines the difference of subcarriers, subcarriers with alternating subcarrier indices are grouped into different combs) and orthogonal cover code (OCC). Figure 4 As can be seen, the ports are divided into code division multiplexing (CDM) groups, where each CDM group uses a respective OCC (such as Walsh-Hadamard time division (TD)-OCC in the case of dual-symbol DMRS). Resource components may be combined into component sets, and component sets are assigned to ports.

[0054] All DMRS ports within the same CDM group may be assumed to be quasi co-located (QCL), ie, similar assumptions are made regarding the channel correlation between those DMRS ports, eg, with respect to Doppler shift, Doppler spread, average delay, and delay spread.

[0055] When scheduling data channel transmission, for example, scheduling PDSCH, one or more layers are scheduled. The term spatial layer (or layer) refers to one of the different streams generated by spatial multiplexing. A layer can be described as a mapping of symbols to transmit antenna ports. Each layer is identified by a precoding vector of size equal to the number of transmit antenna ports and can be associated with a radiation pattern. The rank of a transmission is the number of layers transmitted. A codeword is an independently coded block of data corresponding to a single transport block (TB) transferred from the medium access control (MAC) layer in the transmitter to the physical layer and protected by a cyclic redundancy check (CRC). Typically, one layer is allocated per transmission time (TTI) interval (which corresponds to a subframe in LTE). However, in NR, there can be different TTIs, depending on URLLC or eMBB. Specifically, in NR, a TTI can be a slot, a minislot, or a subframe. For layers, ranks, and codewords, see also Section 11.2.2.2 of LTE: The UMTS Long Term Evolution, 2nd edition, by S. Sesia, I. Toufik, and M, Baker.

[0056] Typically, the TTI determines the timing granularity of the scheduling allocation. One TTI is the time interval during which a given signal is mapped to the physical layer. For example, conventionally, the TTI length can vary from 14 symbols (slot-based scheduling) to 2 symbols (non-slot-based scheduling). Downlink and uplink transmissions are specified to be organized into frames (10 ms duration) consisting of 10 subframes (1 ms duration). In slot-based transmissions, the subframes are in turn divided into slots, the number of slots being defined by the parameter set / subcarrier spacing, and the specified values ​​range between 10 slots for a subcarrier spacing of 15 kHz to 320 slots for a subcarrier spacing of 240 kHz. The number of OFDM symbols per slot is 14 for a normal cyclic prefix and 12 for an extended cyclic prefix (see Section 4.1 (general frame structure), Section 4.2 (Numerologies), Section 4.3.1 (frames and subframes), and Section 4.3.2 (slots) of 3GPP TS 38.21 1 V15.0.0 (2017-12)). However, the allocation of time resources for transmission may also be non-slot based. Specifically, a TTI in a non-slot based allocation may correspond to a mini-slot instead of a slot. That is, one or more mini-slots may be allocated to the requested data / control signaling transmission. In a non-slot based allocation, the minimum length of a TTI may typically be 2 OFDM symbols.

[0057] The layers are mapped to DMRS port numbers using the port indication table specified in Chapter 7 of 3GPP TS 38.212 V15.2.0. For example, DCI format 1-1 and format 0-1 are used to schedule PDSCH and PUSCH, respectively. Each of these formats contains a field called "antenna port" that indicates the mapping of layers to ports to these tables. The specification in NR Rel.15 for mapping layers to ports is based on the assumption of single TRP transmission. This means that the table contains entries in which DMRS ports within the same CDM group are mapped to multiple layers for transmission on a single TRP. If such mapping is applied to multi-TRP transmission, for example, if layer 1 is transmitted on TRP1 and layer 2 is transmitted on TRP2, the DMRS port mapping of these two layers is such that it is assumed that these two ports are QCLed. Such mapping can be applied to a single TRP or to multiple TRPs that are close enough to each other, because the DMRS ports can be assumed to be QCLed.

[0058] However, for the case where multiple TRPs are far apart from each other and multiple layers are transmitted on different TRPs, the present disclosure proposes that due to the different geographical locations of the TRPs, the DMRS ports assigned to these layers are not QCL, that is, not in the same CDM group. Therefore, a new table with modified entries or additional entries can help support non-QCL DMRS port to layer mapping for multiple TRPs. Some other possible signaling modifications can further help scheduling via a single PDCCH.

[0059] In DCI format 1-1 for PDSCH scheduling (Section 7.3.1.2.2 of 3GPP TS 38.212 V15.2.0), a field called Transmission Configuration Indication (TCI) is included, which is used to indicate one of eight TCI states (if configured) using 3 bits. The UE can be configured with a list of up to M TCI states configured within the higher layer (in this context, higher layer means higher layer than the physical layer) parameter PDSCH-Config, which is configured in the radio resource control (RRC) signaling (in the example of DCI format 1-1 above, M = 8, corresponding to the maximum number of 3 bits in the TCI field). Each TCI state contains parameters for configuring a quasi-co-location relationship between one or two downlink reference signals and the DMRS ports of the PDSCH. Further information on different QCL types and other related information can be found in Section 5.1.5 of 3GPP TS 38.212 V15.2.0. Therefore, a single PDCCH (single DCI) has up to 3 bits for TCI signaling to indicate one of eight configuration states that signal the QCL assumption for a TRP and assume the same QCL assumption for other TRPs scheduled by a given PDCCH. Under this QCL assumption, the TCI state information signaled via DCI is particularly applicable to single-TRP transmissions, because the same QCL association may not be valid for a different TRP that is separated from each other. Some modifications can help support independent TCI state signaling for multiple TRPs using a single PDCCH. For example, geographically separated TRPs should have different QCL assumptions and therefore independent TCI state signaling for each TRP.

[0060] like Figure 5 As shown, the present disclosure provides a user equipment 510, which includes a transceiver 520 (receiver / transmitter) and a circuit 530 (processing circuit). The transceiver 520 (or "UE transceiver") receives downlink control information (DCI) on a PDCCH for scheduling UEs and multiple transmission and reception points (TRPs, e.g., Figure 2 and Figure 3The UE transceiver 520 may include a plurality of transmissions or receptions between TRP1 and TRP2 as shown in FIG. 1 , wherein the DCI includes one or more indicators indicating one or more corresponding transmission parameters. The circuit 530 (or "UE circuit", which may include a transmission parameter acquisition circuit 535), based on the one or more indicators and based on the configuration, obtains a plurality of values ​​of the one or more transmission parameters, respectively. The UE transceiver 520 performs the plurality of transmissions or receptions using a corresponding one of the plurality of values ​​of the one or more transmission parameters for each of the plurality of transmissions or receptions.

[0061] Further provide and Figure 5 5 is a network node 560 including a transceiver 570 and a circuit 580. The circuit 580 (or "network node circuit", which may include a transmission parameter determination circuit 585) determines multiple values ​​of one or more transmission parameters for multiple transmissions and receptions between multiple transmission and reception points (TRPs) and user equipment (UEs), and generates downlink control information DCI for scheduling multiple transmissions or receptions, the DCI including one or more indicators indicating one or more corresponding transmission parameters, wherein the one or more indicators respectively indicate multiple values ​​of the one or more transmission parameters in combination with the configuration. The network node transceiver 570 transmits the DCI on the PDCCH.

[0062] Likewise Figure 5 As shown, the UE 510 and the network node 560 communicate with each other via at least one communication channel, for example, a wireless channel or a radio channel in a wireless or radio communication system such as NR, LTE or LTE-A.

[0063] The transceivers (UE transceiver 520 and network node transceiver 570) include hardware, such as one or more antennas, and software that controls the transmission and / or reception performed by the hardware.

[0064] Corresponding to the UE and network node disclosed above, the present disclosure also provides a communication method for a user equipment (“UE method”) and a communication method for a network node (“network node method”). Figure 6 Method steps of a UE method and a network node method are shown.

[0065] In step S610 of the network node method, multiple values ​​of one or more transmission parameters for multiple transmissions and receptions between multiple transmission and reception points (TRPs) and user equipment (UE) are determined. In step S620 of the network node method, downlink control information (DCI) for scheduling multiple transmissions or receptions is generated. The DCI includes one or more indicators indicating one or more corresponding transmission parameters, wherein the one or more indicators respectively indicate multiple values ​​of the one or more transmission parameters in combination with the configuration. In addition, in step S630, the DCI is sent on the PDCCH and, in step S635 of the UE method, is received at the UE side. In step S645 of the UE method, multiple corresponding values ​​of the one or more transmission parameters are obtained based on the one or more indicators and based on the configuration. In step S655 of the UE method, multiple transmissions or multiple receptions are performed using a corresponding one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0066] The technology disclosed herein can help to use a single PDCCH to indicate the signaling of separate DMRS port to layer mapping and TCI status for multiple TRPs. For example, it can help to increase the DCI overhead (or not significantly increase the DCI overhead) as the number of TRPs increases. In addition, it can help to reuse the technology in the existing specifications. In addition, given the possible large number of TRPs, the disclosed technology can help to provide scalability and flexibility. In addition, it can help URLLC communication.

[0067] In the following details, embodiments of the above disclosed apparatus and corresponding methods are provided.

[0068] As described above, the transmission (network node) and reception (UE) of DCI on the PDCCH can be a single PDCCH in a multi-TRP communication. For example, the PDCCH schedules multiple transmissions / receptions, each of which is performed on one of the multiple channels using one of the multiple TRPs.

[0069] The DCI includes one or more indicators indicating one or more transmission parameters, respectively. Specifically, the transmission parameter may be a transmission parameter related to the QCL. For example, the DCI may include one or both of the above-mentioned parameter TCI and the configured index from the DMRS port indication table, and may determine (network node) and obtain (UE) the value of one or more of these parameters.

[0070] Based on one or more transmission parameters, corresponding values ​​of one or more transmission parameters may be obtained or derived. For example, one or more values ​​may be obtained from a combination of configuration and parameters in the DCI corresponding to the values, respectively. In addition, the configuration may be a combination of a static configuration part (which may be defined in the standard) and a "semi-static" configuration part, which is configured in a higher layer signaling such as RRC signaling. For example, the configuration (or part of the configuration) signaled semi-statically includes an element or parameter that enables the use of a "multi-TRP" configuration provided in the configuration, which may be an addition to a "single TRP" configuration.

[0071] A single TRP configuration may include the above configuration of TCI state variables or one or more port indication tables, such as the above port indication table specified in Chapter 7 of 3GPP TS 38.212 V15.2.0, which may be referred to as a single TRP configuration table. A multi-TRP configuration may include additional port indication tables, for example, tables designed for multi-TRP combinations. These additional tables may be included in a static configuration or signaled via RRC.

[0072] There are several possible combinations between the combinations of configurations and parameters included in the DCI. For example, a multi-TRP configuration may provide additional pointers or parameters to a single TRP configuration, which may be included in a table of additional configurations. In addition, for example, the interpretation of the parameters in the DCI may be determined based on an enabling parameter or a radio network temporary identifier (RNTI) included in the configuration. Based on multiple configured RNTIs (e.g., a specific RNTI among multiple configured RNTIs) or enabling parameters for scrambling (network node) / descrambling (UE) attached to the CRC of the DCI, the UE determines one (e.g., single TRP) or multiple (multi-TRP) values ​​for the parameter based on a single TRP configuration, a multi-TRP configuration, or a combination of a single TRP configuration and a multi-TRP configuration (such as several pointers to a single TRP configuration).

[0073] The UE transceiver 520 performs multiple transmissions to or from multiple TRPs using corresponding values ​​of transmission parameters for each transmission or for at least two of the multiple transmissions. For example, the UE uses corresponding TCI state values ​​for the corresponding TRPs. In addition, as an example, the UE may use different DMRS port indication values ​​to send to or receive from each of the multiple TRPs. The corresponding values ​​of the transmission parameters of different TRPs (e.g., DMRS port indications and / or TCI states) may be different in their QCL assumptions.

[0074] Multiple transmissions to or receptions from several TRPs may be transmissions of the same data / codeword or different data / codewords. For example, the corresponding codewords of two codewords being transmitted / received may be the same or different. In addition, the same data may be transmitted / received using the same or different modulation and coding schemes (MCS) and / or redundancy versions. In addition, different layers of a single codeword may be transmitted to or received from different TRPs.

[0075] Multiple transmissions or receptions can be uplink or downlink transmission / reception of data or control information on a channel (such as PDSCH, PUSCH or PUCCH). For example, the UE sends data and / or control information to multiple TRPs, or multiple TRPs send data and / or control information to the UE.

[0076] For example, the multiple transmissions or receptions scheduled by the DCI are uplink transmissions from the UE to multiple TRPs, or the multiple transmissions are downlink transmissions from multiple TRPs to the UE. It is further possible that the multiple transmissions / receptions scheduled by the DCI include one or more uplink transmissions and one or more downlink transmissions.

[0077] As described above, multi-TRP communication may include a case where each TRP is respectively equipped with an RF block and a baseband circuit, and a case where one baseband circuit is shared between multiple TRPs, each TRP including a corresponding RF block. Therefore, the network node 560 includes one or more TRPs. For example, one or more TRPs are included in the network node transceiver 570. However, the multiple TRPs may also include TRPs that are not included in the network node 560. For example, the network node may determine the values ​​of the transmission parameters and send these values ​​to another baseband circuit that may be included in another network node via an ideal or non-ideal backhaul link. Alternatively, the network node may determine the transmission parameters by receiving control information from another network node / baseband circuit over an ideal or non-ideal backhaul link.

[0078] Therefore, in some embodiments, the network node transceiver 570 performs at least one of the multiple transmissions or receptions using a corresponding one of the multiple values ​​of one or more transmission parameters for each of the multiple transmissions or receptions. The at least one transmission or reception is performed between the UE and at least one TRP of the multiple TRPs. Therefore, in these embodiments, the network node method further includes performing a transmission or reception step S660 of at least one (one, multiple or each) of the multiple transmissions. Wherein, one, multiple or each of the multiple TRPs is used respectively.

[0079] As described above, in some embodiments, the one or more transmission parameters include at least one of DMRS, demodulation reference signal, port indication and transmission configuration indication, TCI state. In addition, the present disclosure provides several embodiments, which involve different elements (such as RNTI, or an enabling parameter in RRC signaling), a combination table that can be signaled or statically configured in RRC, and a combination of the aforementioned elements. In the following, some embodiments will be described in further detail.

[0080] RNTI-based implementation

[0081] In some embodiments, the configuration includes a RNTI, or the RNTI is derivable from the configuration, which the network node uses to scramble a cyclic redundancy check (CRC) attached to the DCI. The UE circuit 530 descrambles the CRC attached to the DCI using the RNTI, wherein the RNTI alone or in combination with one of the indicators in the DCI signaling indicates a value of at least one of the multiple values ​​of the transmission parameter.

[0082] For example, the RNTI (specifically, a numerical value of the RNTI) may correspond to a value of a transmission parameter. For example, there may be a mapping between possible numerical values ​​of the RNTI, at least one of which may be statically configured or configured in RRC signaling, and a DCI field for the same parameter may be used for the value of the parameter for a first transmission to a first TRP or a first reception from a first TRP, while the value indicated by the RNTI is the value of the parameter for a second transmission to a second TRP or a second reception from a second TRP. Additionally or alternatively, the RNTI may indicate that for the same or another transmission parameter, a corresponding field in the DCI is to be interpreted as representing several (e.g., two) values ​​of the transmission parameter value for multiple transmissions / receptions via several TRPs, where the mapping between the value in the DCI and the several values ​​may be defined by a combination table included in the configuration.

[0083] Therefore, the present disclosure provides some embodiments based on the RNTI-based method. As to which RNTI is used specifically, several possibilities are possible. For example, a new UE-specific RNTI may be introduced for multi-TRP-specific signaling, or a UE-specific RNTI that already serves certain functions, such as MCS-C-RNTI (MCS cell RNTI), may be functionally enhanced to additionally indicate multi-TRP-specific signaling.

[0084] The RNTI-based embodiments of the present disclosure can be implemented without additional DCI overhead. Instead of including different values ​​of a given transmission parameter in the DCI, the additional value of the given parameter can be obtained from the RNTI or from a table pointed to by the RNTI. At the same time, independent indication of different TRPs can be facilitated. In addition, a unified method for issuing different signaling (e.g., DMRS and TCI signaling) is provided, because the RNTI can be used as an indicator of the DMRS port indication, the TCI status indication, both, or some additional fields.

[0085] For example, a new UE-specific RNTI is configured by RRC, or an existing RNTI, such as MCS-C-RNTI, is reused, for example, to provide additional functionality, where

[0086] • the scrambling of the new RNTI implicitly indicates the use of a different DMRS port indication table for multiple TRPs, for example, a multiple TRP DMRS port indication table that is different from a single TRP DMRS port indication table as described above; and / or

[0087] • The specific RNTI value of the scrambled DCI CRC (CRC appended to the DCI) is used to indicate the TCI status of an additional TRP (e.g., a TRP not used for PDCCH transmission), where more than one value is configured for a new RNTI or an existing RNTI with enhanced functionality (or derivable from an already configured or existing RNTI).

[0088] A multi-TRP table may be defined in the standard, such as a DMRS port indication table designed and specified for the multi-TRP case.

[0089] In a communication method using an RNTI-based method for multiple TRP indications, the following exemplary steps may be involved:

[0090] 1. If the RRC does not configure a new RNTI or does not enhance an existing RNTI (e.g., define additional functionality for an existing RNTI), then follow existing procedures, e.g., use an existing signaling framework, e.g., procedures used in single TRP communications, which may include a single TRP DMRS port indication table.

[0091] 2. If the RRC configures this new RNTI or uses enhancements to the existing RNTI, further steps are taken based on the result of descrambling the DCI CRC.

[0092] 3. If the DCI CRC is not scrambled with the RNTI, follow the existing procedures, for example, using the existing signaling framework.

[0093] 4. If the DCI CRC is scrambled with one of the possible values ​​for this RNTI, the following procedure is followed:

[0094] a. Use the new DMRS port mapping table

[0095] b. Upon descrambling, the UE identifies the RNTI value used for scrambling and calculates the TCI state for the second TRP (unlike the first TRP, from which the DCI has been signaled on the PDCCH).

[0096] c. The TCI status of the first TRP is signaled via the DCI existing bit field (one of the indicators).

[0097] However, as will be further described in some exemplary embodiments, step a may be performed separately and independently of steps b and c. In addition, steps b and c may be performed without step a. Specifically, the above steps 1 to 4 of the multi-TRP communication method may differ depending on whether multi-TRPRNTI is used, i) an indication of a new DMRS table for multiple TRPs, ii) an indication of 2 or more TCI state values ​​for 2 TRPs or multiple TRPs, or iii) an indication of a new DMRS table for multiple TRPs. In cases i) and iii), the use of the existing framework includes the use of a single TRP DMRS port indication table. In addition, in case i), step 4 includes step a, in case ii), step 4 includes steps b and c, and in case iii), step 4 includes steps a to c. In addition, as described above, the RNTI is a dedicated RNTI or a given RNTI enhanced by a configured multi-TRP function. In cases ii) and iii), K RNTI candidate values ​​are configured or derivable from the configuration, as will be further described.

[0098] It should also be noted that the present disclosure is not limited to which type of indicator (DCI bit field or RNTI) is applied to which TRP. For example, contrary to the above description, the bit field in the TCI can be applied to a TRP from which a PDCCH is not transmitted, such as the second TRP mentioned above. Figure 7 An exemplary structure of the parameter acquisition circuit 535 is shown, including a descrambling circuit 736, and including at least one of a table selection circuit 737 and a TCI status acquisition circuit 738.

[0099] In some embodiments, RNTI is used for indication of a DMRS table for multi-TRP communication. The configuration includes a first DMRS port indication table and a second DMRS port indication table. The UE circuit 530 uses a radio network temporary identifier (RNTI) included in the configuration or derivable from the configuration to descramble a cyclic redundancy check (CRC) attached to the DCI. The RNTI indicates that the second DMRS port indication table will be used for at least one of multiple transmissions or receptions. The UE transceiver 520 uses the second DMRS port indication table to perform at least one of the multiple transmissions or receptions based on the result of successfully performing the descrambling of the CRC using the RNTI, wherein the indicator indicates a DMRS port indication from the second DMRS port indication table.

[0100] Table 1 is an exemplary DMRS port indication table, which can be used for multi-TRP communication in the case of type 1 DMRS type configuration and one symbol length. Therefore, Table 1 is an example of the second DMRS port indication table (or "multi-TRP port indication table") described above, while the first DMRS port indication table can be a "single TRP" DMRS port indication table as described above. Figure 4 It can be seen that ports 0 and 1 are quasi-co-located (because they are in the same CDM group), and also ports 2 and 3. The column "Number of DMRS CDM groups without data" indicates the number of CDM groups on which reference signals (but not data) are signaled or occupied by another UE for DMRS transmission / reception (and therefore no data for the given user equipment under consideration).

[0101]

[0102] Table 1: DMRS port indication table

[0103] The column value includes the index of the different rows corresponding to the DMRS configuration. The DMRS configuration in the row is dynamically scheduled to the UE by a four-bit field in the DCI. Therefore, the DMR port indication is one of the transmission parameters based on which multiple transmissions or receptions are performed. This four-bit field is an indicator indicating an index corresponding to the "Value" column in the table representing the DMRS port indication.

[0104] Therefore, according to the result of the successful descrambling CRC, if the RNTI used for descrambling is an RNTI with a multi-TRP function, the DMRS port indication for multiple transmissions or receptions is derived from the second DMRS port indication table instead of the first DMRS port indication table. In this case, the indicator in the DCI indicates an entry from the "value" column of the second DMRS port indication table instead of the first DMRS port indication table, and the value corresponds to multiple ports, as defined in the corresponding row in the "DMRS port" column, which includes multiple non-quasi-co-located ports respectively allocated to multiple TRPs.

[0105] In addition, Table 1 shows the case where only one codeword (codeword1) is enabled. In this case, different layers of the codeword are sent to or received from different TRPs. The rows indicated by values ​​7 to 12 (entries 7 to 12) can be used for multi-TRP transmission or reception. In rows 7 and 8, the indicated port combinations (0,2) and (0,3) are both non-quasi-colocated and can therefore be used for transmission using two ports. Entries 10 to 12 each represent a combination including at least two quasi-colocated ports. If these combinations are for three layers (entries 10, 11) or four layers (entry 12), the quasi-colocated ports are mapped to the same TRP, while ports belonging to different CDM groups are mapped to different TRPs.

[0106] However, Table 1 is an example, and the present disclosure may be applied using different DMRS port indication tables. For example, more than one codeword may be enabled. In this case, layers of different codewords may be mapped to different TRPs.

[0107] As described above, in lieu of or in combination with the derivation of the DMRS port indication value previously described, the result of successfully descrambling the RNTI can be used to indicate the TCI status of transmission to or reception from one of multiple TRPs.

[0108] In some embodiments, an indicator included in the DCI indicates a first value of a plurality of values ​​of the TCI state. In addition, the RNTI is one of K RNTI candidates, wherein a first of the K RNTI candidates is included in the configuration, and the RNTI candidates are K subsequent integers indicating K configured TCI states signaled by a radio resource control (RRC), respectively, and the UE circuit 530 determines the first value of the TCI state based on the indicator, and obtains a second value from among the plurality of values ​​of the TCI state based on a result of successfully descrambling a CRC attached to the DCI using the RNTI candidate as the RNTI, the RNTI candidate indicating the TCI state to be used as a second value of the K TCI states.

[0109] In embodiments where the RNTI indicates a TCI state for transmission, the RNTI may or may not additionally indicate the use of the second DMRS port table as described above.

[0110] The RNTI is one of K (K is an integer) candidates. Since K possible values ​​that the RNTI can take are available (the network node circuit 580 can use these values ​​to scramble the DCI CRC), multiple RNTI candidates can be considered as multi-valued (or multiple-valued) RNTIs or RNTIs configured with more than one value. Based on the mapping between the RNTI value candidates and the (RRC) configured TCI states, the value of the TCI state used to send or receive to / from the second TRP is determined.

[0111] When RNTI is configured with more than one value, the index value or parameter value of the second TCI state of the transmission and reception point TRP2 can be calculated as follows, and the value of the TCI state of the transmission and reception point TRP1 is indicated by an indicator (bit field or bit map) included in the DCI. In the following description, it is assumed that K is equal to 8, but the value of K can generally be greater than 8 (e.g., 16) or less than 8 (e.g., 4), and can change over time according to the RRC configuration:

[0112] o The DCI CRC is scrambled by the network node circuitry 580 with one of the eight values ​​(eg, value 5), which constitute the plurality of K RNTI candidates.

[0113] o The UE receives the DCI and starts descrambling the CRC using value 1, value 2, value 3, etc. subsequently until it successfully descrambles the CRC using one of the values, such as value 5.

[0114] o The UE successfully descrambles the CRC with a value of 5, for example, performs a mod function between values ​​5 and 8 (performs a value 5 mod 8 operation) to determine a value indicating the state of the TCI sent or received to or from TRP2.

[0115] ○The result of the mod function indicates the TCI state from the TCI state configured by RRC for TRP2.

[0116] In the above description, the RNTI candidates are mapped to TCI state values ​​by a mod (modulo) function. However, other functions or operations may be applied to determine the mapping of the RNTI and the corresponding TCI state. For example, a counter may be used by the UE that increments with each attempt to descramble the DCI CRC.

[0117] In addition, as described above, if none of the multi-TRP RNTI candidates allows for successful descrambling of the CRC, another possibly non-multi-TRP related process may be followed. For example, the DCI CRC may be scrambled by the network node via another configured non-multi-TRP related RNTI, such as a C-RNTI without additional multi-TRP functionality ("non-multi-TRP-RNTI"). Thus, on the UE side, the transceiver 520 may perform one or more additional attempts to descramble the DCI using a non-multi-TRP RNTI. The descrambling attempt with the multi-TRP candidate may be performed before, or if necessary, after, the attempt using the non-multi-TRP RNTI. For example, if the channel characteristics are critical to frequently requiring multi-TRP transmissions, using the multi-TRP RNTI candidates first may help prioritize TRP communications. On the other hand, in situations where single TRP communications may be used, using the non-multi-TRP RNTI first may help speed up processing or reduce the required processing.

[0118] How to configure multiple RNTI candidates will be described below. It is sufficient to signal the initial RNTI value (or RNTI candidate) to the UE via RRC only. The UE may assume that K subsequent numbers (e.g., integers) of RNTI values ​​also belong to the candidate set of the multi-valued RNTI or K RNTI candidates and may be used to scramble the RNTI (multi-TRP RNTI or possible enhanced C-RNTI) on the network node side. The exact number of values ​​K depends on the number of TCI states configured by dynamic or semi-static indication (in RRC). From a total number of, for example, 128 TCI states (e.g., according to the standard) in a static configuration, the network node selects, for example, 8 states and signals these 8 states to the UE via RRC. 8 may correspond to the maximum number of RRC-configurable TCI states corresponding to the bit field size in the DCI (e.g., 3 bits). For example, in the example of an additional TRP, the number of RNTIs K may be equal to 8. The RNTI derivable from the configuration therefore includes the case where the RNTI used to scramble / successfully descramble the DCI CRC is one of K adjacent / subsequent or other related values, for example an integer value obtainable / derivable from the initial RNTI signaled in the RRC configuration by numerical operations such as increment or decrement.

[0119] However, the K RNTI candidates may also indicate multiple values ​​of the TCI state for, for example, the second TRP (TRP3) and the third TRP (TRP3). Then, if 4 states instead of the maximum number of 8 states allowed are configured by RRC, the 16 corresponding RNTI candidates may be mapped to a combination of the corresponding TCI states for TRP2 and TRP3.

[0120] According to some embodiments, at least one indicator in the DCI and the RNTI indicates a multi-TRP TCI state, and the multi-TRP TCI state includes more than one TCI state for sending to or receiving from more than one TRP, respectively.

[0121] For example, the multi-TRP state may be a combination of the corresponding TCI states of multiple TRPs (such as TRP2 and TRP3), as described above.

[0122] In another example, the above steps 1 to 4, or similar steps, are performed, wherein the TCI state index (TCI transmission parameter included in the DCI) contains information about more than one TRP, wherein the TCI state signaled via RRC can be configured differently.

[0123] For example, a TCI index corresponding to a TCI state transmission parameter may be configured to indicate TCI state information for more than one TRP. This may result in an increase in the number of indexes, for example, the DCI field indicated by the TCI may or may not be redefined to be more than 3 bits. In general, the exact number of configured multi-TRP TCI states may depend on the scenario (e.g., the number of configured TRPs and / or the location of the TRPs relative to the UE and relative to each other).

[0124] The TCI index can be configured to indicate the TCI state information of more than one TRP by mapping the TCI index to a table of more than one TCI state, as shown in Table 2 and Table 3 below. Table 2 shows the TCI state index of 1 additional TRP, and Table 3 shows the TCI state of 2 additional TRPs.

[0125]

[0126] Table 2: TCI status index for 1 (additional) TRP

[0127]

[0128] Table 3: TCI status of 2 additional TRPs

[0129] The TCI state transmission parameter in the DCI, the RNTI value of the successfully descrambled CRC, or both the TCI state transmission parameter and the RNTI value, depending on the configuration that may be signaled in the RRC, may point to a multi-TRP TCI state table, such as Table 3 for two TRPs. Whether the DCI parameters and / or RNTI will be interpreted by the UE as pointing to a single TRP table (Table 2) or to multiple TRP tables (Table 3) may be configured by the RRC.

[0130] In addition, as shown above, the multi-TRP table 3 in the "TCI state" column can point to the TCI state of Table 2. In this case, since Table 3 references (depends on) Table 2, both types of tables can be configured or signaled via RRC. Alternatively, the multi-TRP state can also be defined in the standard and statically configured. In the latter case, a multi-TRP table can be configured in the RRC, which does not reference a single TRP state in the single-TRP TCI table, but can reference multiple TRP states that are statically configured (for example, references an index to the multiple TRP states in the static configuration).

[0131] Example based on combination table

[0132] Table 3 shown above maps index values ​​to combinations of TCI states to be applied to combinations of TRPs. Thus, Table 3 can be considered a combination table. In the following, several additional examples and embodiments are disclosed in which a combination table is used to indicate values ​​for multi-TRP communications. The present disclosure illustrates the possibility of creating or enabling an intermediate combination table via RRC for multi-TRP signaling. The general structure of a combination table may contain multiple indexes, where each index of a given table corresponds to a row and indicates a corresponding combination of a combination of different TRP identifiers and an index of a DCI bitmap field for a given parameter (such as a DMRS port indication, TCI state, etc.). If the combination table is configured and enabled by RRC, the corresponding bitmap in the DCI may be used to indicate an index to the new combination table, rather than the original indication of the corresponding parameter / index for the single TRP case (e.g., an index to the "value column of Table 1" or the "index column of Table 2").

[0133] Table 4 illustrates a possible general structure of a single TRP indication table, and Table 5 shows the general structure of a multi-TRP combination table.

[0134]

[0135] Table 4: General structure of a single TRP indicator table

[0136]

[0137] Table 5: General structure of a multi-TRP combination table

[0138] Examples of a single TRP parameter indication table include a DMRS port indication table and a TCI state indication table (see Table 2). It should be noted that although the single TRP parameter indication table 4 has a column of "information of a single TRP", such information can be divided into more columns, for example, in a DMRS port indication table including information columns about DMRS groups and DMRS ports with no data, respectively.

[0139] A single TRP indication table (such as Table 4) may have Z rows (indexes) depending on the size of the corresponding field in the DCI. A DCI field of Y bits is used to indicate parameter X, as shown in Table 4, where 2^Y>=Z.

[0140] In the present disclosure, the term "single TRP" is used to distinguish from tables or parameters that are specially designed or configured for multi-TRP applications as described in the present disclosure. For example, as described above, the "single TRP" DMRS port indication table according to the standard can also be applicable to multi-TRP communications to a certain extent. In addition, in some embodiments, the combined table is combined with the single TRP table to indicate parameter value indications. Single TRP tables are also referred to as "existing" tables because they can also be used in non-multi-TRP scenarios, and they need to exist ("existing") so that the combined table can reference them. In addition, in Table 5, "X" indicates that a given transmission parameter, for example, a DMRS port indication for a TCI state, is as indicated by the single TRP indication table.

[0141] It can be seen that Table 3 satisfies the structure of the general combination table 5 and can therefore be considered as an example of a multi-TRP combination table. Therefore, the techniques shown in the section on "Implementation based on combination table" can also be applied to the combination table 3 shown in the previous section of this disclosure, for example, the configuration, RRC signaling, enabling, and indexing of the RRC combination table.

[0142] For example, as can be seen from Table 5, a combination table may contain 3 columns and Z indexes (Z is the same number of indexes as the corresponding single TRP parameter indication table). The first column is the index signaled via DCI. The second column is a combination of TRPs, e.g., a set of TRPs each including one or more TRPs, corresponding to information about parameter X that needs to be signaled. The third column is a combination of indices (a set of "value candidate values") that point to an existing (single TRP) table and indicate information about parameter X for the corresponding TRP for that index.

[0143] In each row (set of maps), the number of TRPs in the "TRP Combination" column (second column) is the same as the number of indexes in the "Index Combination" column (third column). For example, the indexes in the third column correspond to the TRPs in the second column in the order listed (the first value corresponds to the first TRP listed in the same row, the second value corresponds to the second TRP, and so on).

[0144] Furthermore, the combination table may be referred to as an "intermediate" combination table, since it is inserted at an intermediate position in the reference chain / hierarchy, which may for example be as follows: parameters in DCI → intermediate combination table → (multiple values ​​of) single TRP indication table → static configuration.

[0145] In some embodiments, the configuration includes a set of mappings between TRP sets for one or more transmission parameters and value candidate sets of value candidates, and at least one indicator of the one or more indicators included in the DCI indicates from the set of mappings a mapping between one of the TRP sets to be used as multiple TRPs and one of the value candidate sets to be used as multiple values ​​of one or more transmission parameters for multiple transmissions or receptions.

[0146] Figure 8 An exemplary parameter acquisition circuit 535 for an embodiment is shown in FIG. 5 , where the configuration includes a set of mappings between a set of TRPs and a set of value candidates. For example, the parameter acquisition circuit includes a combination table selection circuit (or combination table enabling circuit) 836 and a number of value acquisition circuits 837.

[0147] For example, a set of mappings corresponding to a TRP set and a value candidate set is defined by an intermediate combination table. Each row in the combination table can respectively define one mapping in the set of mappings. The TRP combination corresponds to the corresponding entry in the "TRP combination" column of the combination table. Based on the indication in the DCI (the value of the transmission parameter), associated with one or more indexes in the "Combination of indexes of existing tables of X" column from Table 5, one of the TRP sets is determined / obtained to become multiple TRPs for sending or receiving.

[0148] Furthermore, it can be seen that the general combination table 5 includes entries for a single TRP (in the rows indexed "0" and "1"). Thus, in addition to indicating multiple transmissions and receptions to or from multiple TRPs, the DCI signaling in conjunction with the combination table can indicate a single value for a given transmission parameter for transmission or reception using one TRP. A combination table including one or more rows involving a single TRP can facilitate flexible switching between different TRPs, as well as switching between single-TRP transmission / reception and multi-TRP transmission / reception.

[0149] As described above, the bit field of parameter X points to a row of a combination table, and the number of rows / indexes of the combination table can be equal to or less than the number of rows of the parameter indication table (Table 4). Therefore, an embodiment using a set of mappings (combination table) can be implemented without incurring additional DCI overhead. However, the number of rows in the combination table can also be generally greater than the number of rows in the parameter indication table. In general, a flexible and scalable technique is provided that can facilitate communication between a UE and a large number of TRPs. In addition, the set of mappings can be applicable to different DCI fields designed for single TRP applications or without considering multi-TRP situations, as well as one or more DCI fields at a time instance.

[0150] The combined table of parameters X may be configured as a new table, and different alternative (eg, static and dynamic) configurations may be applied.

[0151] In some embodiments, the set of mappings includes M mappings out of N statically configured mappings, M is equal to or less than N, and the UE transceiver 520 receives M indices indicating the M mappings respectively signaled by the network node transceiver 570 via RRC, and the at least one indicator indicates the index, which indicates a mapping between multiple TRPs and multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0152] Thus, a combination table may be statically configured to include N rows corresponding to mappings between TRP sets and parameter candidate sets, and correspondingly, N indexes covering various combinations (e.g., a set of all possible TRP combinations or desired / required TRP combinations). The number N of statically configured indexes constitutes a superset of the indexes.

[0153] The network node 560 then signals a (sub)set of M indexes in the superset of N indexes (M<=N). The set of M indexes corresponds to a set of M mappings between the TRP set and the value candidate set, from which parameters for transmission or reception are selected and indicated by the DCI field. The network node uses the DCI bit field of parameter X to dynamically indicate one index of the (sub)set of mappings to the UE, and the UE is notified of the index via RRC.

[0154] However, the combination table (rather than just an indexed subset of the statically configured combination table) may be signaled via RRC signaling. Regardless of whether the combination table is statically configured or RRC configured, the combination table may have the structure of Table 5.

[0155] In some embodiments, the contents of a mapping table defining a set of mappings between TRP sets and (index) value candidates are signaled by RRC.

[0156] For example, RRC dynamically configures a new combination table that defines a set of mappings, and the entire table (e.g., a list of entries for each column) is signaled to the UE via RRC signaling. The length of the RRC-configured configuration table may vary, for example, depending on the number of TRPs and scenarios. The network node dynamically indicates to the UE an index from the RRC-configured configuration table using the DCI bit field of parameter X.

[0157] For example, the RRC signaling indicating the index list in the new combination table of parameter X can be signaled in the information element "PDSCH-Config" of the RRC, such as Fig. 9 As shown in Figure 1, the definition of parameter X is shown in bold. Fig.10 and Fig.11As further shown in the example of , parameter X may be, for example, a DMR port indication and / or a TCI status. Through this information element, the content of each index of the combination table is informed to the UE, similar to other parameters also included in this information element. Through RRC signaling, the UE obtains information including the number of indexes of the combination table and the content of each index of the combination table (corresponding TRP sets and value candidate sets (values ​​of single TRP indication table indexes of each row)).

[0158] If no combination table is configured by static configuration or by RRC, a procedure may be followed in which a field in the DCI directly points to a (single TRP) indication table such as a DMRS port indication table or a configured TCI state table.

[0159] The format of the combined table may be statically defined, including the number of columns and the information to be received in each column (including the type of information in each column, e.g., "set of TRPs" and "combination of indexes for existing tables"). The format of the combined table (or combined tables) may be static and the same regardless of the number of TRPs.

[0160] As described above, the PDSCH configuration element (PDSCH-Config) of RRC indicates the number of indexes and the content of each index. The number of indexes and the content of the table (mapping between TRP sets and value candidate sets) differ depending on the number of TRPs using the combination table (the number of TRPs from which the individual TRP sets are selected / formed). However, the format of the table (including the number of columns and their interpretation) can be the same regardless of the number of TRPs that need to indicate parameter X. Therefore, no additional signaling is required to indicate how many TRPs are involved because the number of TRPs is implicit in the content of the combination table. Table 7 is an example of a combination table for a two TRP case, and Table 8 is an example of a combination table for a four TRP case.

[0161]

[0162] Table 7: Dual TRP combination table for parameter X indication

[0163]

[0164] Table 8: 4-TRP combination table representing parameter X

[0165] For some communication systems or scenarios, it may be determined or defined that if a combination table is configured (via RRC and / or static combination), the combination table will be used to indicate the value of parameter X or multiple parameters. However, if a combination table is configured, different enabling mechanisms (e.g., "turning on" or "turning off" multi-TRP communication) may be implemented to enable or not enable the multi-TRP combination table.

[0166] For example, a parameter may be included in a PDCCH information element (IE) to indicate to the UE whether a new combination table is to be used, and the DCI bit field of the given parameter should point to the new combination table. Fig.12 As shown, the existence of the combination table and the use of the combination table can be signaled in the control resource set information element of the RRC signaling. The UE transceiver 520 receives an enabling parameter, which indicates that multiple transmissions or receptions will be performed based on the set of mappings, and the enabling parameter is signaled by the RRC, and the UE circuit 530 determines that multiple transmissions or receptions will be performed based on the set of mappings based on the enabling parameter.

[0167] Among them, "parameter_X" can be a parameter for DMRS port indication, TCI status indication, or some other parameters. Fig.13 As shown, the activation parameter such as DMRSPortMultiTRP-CombinedTableIndicationIndexDCI is used to notify the UE that the combined table of multiple TRPs is enabled, and the combined table is used to point to the existing DMRS port indication table. Fig.14 As shown, a parameter such as TCIStateMultiTRP-CombinedTableIndicationInDCI may be used to notify the UE of enabling a combined table for multiple TRPs, which is used to point to a TCI state (which may be defined in a single TRP TCI state indication table).

[0168] It should be noted that the corresponding enabling parameter does not carry the actual content / information of the corresponding combination table, it is only an indication for enabling the use of the combination table. As mentioned above, the actual content of the combination table may be included, for example, in the PDSCH-Config information element.

[0169] However, there are other techniques on how to communicate the existence of a combination table or the enabling of the use of a combination table to the UE. For example, similar to the embodiments described in the previous section, the UE-specific RNTI can be a newly configured, or an existing RNTI enhanced with additional functionality to indicate the enabling of a combination table. If the DCI CRC is scrambled with this RNTI, the UE assumes that a combination table is used, and the bit field in the DCI for parameter X points to the index of the combination table.

[0170] Therefore, the UE circuit 530 descrambles the CRC attached to the DCI using the RNTI included in the configuration or derivable from the configuration, wherein the RNTI indicates that multiple transmissions or receptions are to be performed based on a set of mappings (e.g., a combination table), and based on the result of successfully descrambling the CRC attached to the DCI using the RNTI, determines that multiple transmissions or receptions are to be performed based on the set of mappings.

[0171] In addition, the functionality of the RNTI described in this section can be combined with the functionality of the RNTI described in the RNTI-based method disclosed in the previous section. For example, the RNTI candidate set is a subsequent integer that the UE uses to perform consecutive descrambling attempts instead of a single TCI state indication table.

[0172] An example of DMRS port indication signaling using a combination table is given below. Table 9 is a DMRS port indication table of configuration type 1 with a length of 1 symbol. The table has 16 indexes. If a combination table for DMRS port indication, such as Table 10, is configured and enabled, instead of directly signaling the index of the DMRS port indication table, 4 bits (i.e., the four-bit DCI field for DMRS port indication) are used to indicate the index on the right side of the combination table, which points to the DMRS port indication table for two TRPs. The exact combination, number of indexes, etc. can be configured by RRC depending on the scenario. In addition, it should be noted that Table 10 only shows an exemplary structure of the combination table, and these values ​​are not necessarily applicable to Table 9. Instead, these entries should be understood as placeholders.

[0173]

[0174] Table 9: DMRS port indication table

[0175]

[0176] Table 10: Example structure of DMRS combination table

[0177] In addition, as described above, a combination table can be used for multi-TRP TCI state signaling. Table 11 shows an indication table that can be used for up to eight TCI states. If the TCI state combination table is not enabled, the existing TCI bit field with 3 bits can indicate one of the eight configured states of Table 11 for one TRP. However, if a TCI state combination table such as Table 12 is enabled, 3 bits in the DCI are used to indicate the index of the combination table (Table 12), rather than directly signaling the index of the TCI state, and these 3 bits point to the TCI state of 2 TRPs (e.g., two independent states in Table 11). The exact combination (and which of the total available statically configured TCI states to activate), the number of indexes, etc. can be configured by RRC according to the scenario.

[0178]

[0179] Table 11: TCI status indication table

[0180]

[0181] Table 12: Example structure of TCI status combination table.

[0182] The present disclosure may be implemented by software, hardware, or software in cooperation with hardware. Each functional block used in the description of each of the above embodiments may be partially or entirely implemented by an LSI such as an integrated circuit, and each process described in each embodiment may be partially or entirely controlled by the same LSI or a combination of LSIs. The LSI may be formed as a chip alone, or may be formed as one chip to include some or all of the functional blocks. The LSI may include data inputs and outputs coupled thereto. Depending on the degree of integration, the LSI here may be referred to as an IC (integrated circuit), a system LSI, a super LSI, or a super LSI. However, the technology for implementing an integrated circuit is not limited to LSI, and may be implemented by using a dedicated circuit, a general-purpose processor, or a dedicated processor. In addition, a field programmable gate array (FPGA) that can be programmed after manufacturing the LSI or a reconfigurable processing unit in which the connection and setting of the circuit unit arranged inside the LSI can be reconfigured may be used. The present disclosure may be implemented as digital processing or analog processing. If future integrated circuit technology replaces LSI due to the development of semiconductor technology or other derivative technologies, future integrated circuit technology may be used to integrate the functional blocks. Biotechnology may also be applied.

[0183] The present disclosure may be implemented by any type of device, apparatus or system having a communication function, which is referred to as a communication device.

[0184] Some non-limiting examples of such communication devices include phones (e.g., cellular phones (mobile phones), smart phones), tablets, personal computers (PCs) (e.g., laptops, desktops, netbooks), cameras (e.g., digital still / video cameras), digital players (digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices), game consoles, e-book readers, telehealth / telemedicine (remote health and medicine) devices, and vehicles that provide communication capabilities (e.g., cars, airplanes, ships), and various combinations thereof.

[0185] Communication devices are not limited to portable or transportable, and may also include any kind of non-portable or fixed device, equipment, or system, such as smart home devices (e.g., appliances, lighting, smart meters, control panels), vending machines, and any other "things" in an "Internet of Things (IoT)" network.

[0186] Communications may include exchanging data via, for example, cellular systems, wireless LAN systems, satellite systems, etc., and various combinations thereof.

[0187] The communication device may include a device such as a controller or a sensor that is coupled to a communication device that performs the communication functions described in the present disclosure. For example, the communication device may include a controller or a sensor that generates a control signal or a data signal that is used by the communication device that performs the communication functions of the communication device.

[0188] The communication device may also include infrastructure such as base stations, access points, and any other device, equipment, or system that communicates with or controls devices such as those in the above non-limiting examples.

[0189] The present disclosure provides a user equipment (UE), comprising: a transceiver, receiving downlink control information (DCI) for scheduling multiple transmissions or receptions between the UE and multiple transmission and reception points (TRPs) on multiple channels on a physical downlink control channel (PDCCH), the DCI comprising one or more indicators indicating one or more corresponding transmission parameters; and a circuit, based on the one or more indicators and based on a configuration, obtaining multiple values ​​of the one or more transmission parameters, respectively, wherein the transceiver performs the multiple transmissions or receptions using a corresponding one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0190] In some embodiments, the one or more transmission parameters include at least one of a demodulation reference signal (DMRS), a port indication, and a transmission configuration indication (TCI) state.

[0191] In some embodiments, the configuration includes a radio network temporary identifier (RNTI), or the RNTI is derivable from the configuration, and the UE circuitry descrambles the CRC attached to the DCI using the RNTI, wherein the RNTI alone or in combination with at least one indicator in the DCI signaling indicates a value of at least one of a plurality of values ​​of the transmission parameter.

[0192] In some embodiments, the configuration includes a first DMRS port indication table and a second DMRS port indication table, the circuit descrambles a CRC attached to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, wherein the RNTI indicates that the second DMRS port indication table is to be used for at least one of a plurality of transmissions or receptions, and the transceiver performs at least one of the plurality of transmissions or receptions using the second DMRS port indication table based on a result of successfully performing descrambling of the CRC using the RNTI, wherein the indicator indicates a DMRS port indication from the second DMRS port indication table.

[0193] For example, the indicator indicates a first value of multiple values ​​of the TCI state, the RNTI is one of K RNTI candidates, wherein a first of the K RNTI candidates is included in the configuration, and the RNTI candidate is K subsequent integers respectively indicating K configured TCI states signaled by a radio resource control (RRC), and the circuit determines the first value of the TCI state based on the indicator, and obtains a second value from the multiple values ​​of the TCI state based on a result of successfully descrambling a CRC attached to the DCI using the RNTI candidate as the RNTI, the RNTI candidate indicating the TCI state to be used as a second value of the K TCI states.

[0194] For example, the indicator indicates a first value among multiple values ​​of the TCI state, the circuit descrambles the CRC attached to the DCI using a radio network temporary identifier (RNTI) included in the configuration or derivable from the configuration, the RNTI is one of K RNTI candidates, wherein a first of the K RNTI candidates is included in the configuration, and the RNTI candidate is K subsequent integers respectively indicating K configured TCI states signaled by the RRC, and the circuit determines the first value of the TCI state based on the indicator, and obtains a second value from the multiple values ​​of the TCI state based on a result of successfully descrambling the CRC attached to the DCI using the RNTI candidate as the RNTI, the RNTI candidate indicating the TCI state to be used as a second value among the K TCI states.

[0195] According to some embodiments, at least one of the indicator and the RNTI indicates a multi-TRP TCI state, and the multi-TRP TCI state includes more than one TCI state for sending to or receiving from more than one TRP, respectively.

[0196] In some embodiments, the configuration includes a set of mappings between TRP sets and value candidate sets of value candidates for one or more transmission parameters, and at least one of the one or more indicators indicates a mapping between one of the TRP sets in the mapped set to be used as multiple TRPs and one of the value candidate sets for multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0197] In some embodiments, the set of mappings includes M mappings of N statically configured mappings, M is equal to or less than N, and the transceiver receives M indices indicating the M mappings signaled by the RRC, respectively, and the at least one indicator indicates an index of a mapping between multiple TRPs and multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0198] In some embodiments, the transceiver receives contents of a mapping table defining a set of mappings, the contents of the mapping table being signaled by RRC.

[0199] For example, the transceiver receives an enabling parameter indicating that multiple transmissions or receptions are to be performed based on a set of mappings, and the enabling parameter is signaled by RRC, and the circuit determines based on the enabling parameter that multiple transmissions or receptions are to be performed based on the set of mappings.

[0200] For example, the circuit descrambles a cyclic redundancy check (CRC) attached to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, wherein the RNTI indicates that multiple transmissions or receptions are to be performed based on a mapped set, and based on a result of successfully descrambling the CRC attached to the DCI using the RNTI, determines that multiple transmissions or receptions are to be performed based on the mapped set.

[0201] In some embodiments, the transceiver receives a signal including an RRC.

[0202] The present disclosure also provides a network node, comprising: a circuit, determining multiple values ​​of one or more transmission parameters for multiple transmissions and receptions between multiple transmission and reception points (TRPs) and user equipment (UE) on multiple channels, and generating downlink control information (DCI) for scheduling multiple transmissions or receptions, the DCI comprising one or more indicators indicating one or more corresponding transmission parameters, wherein the one or more indicators indicate multiple values ​​of the one or more transmission parameters in combination with a configuration; and a transceiver, sending the DCI on a physical downlink control channel (PDCCH).

[0203] For example, the transceiver performs at least one of the plurality of transmissions or receptions using a corresponding value of a plurality of values ​​of one or more transmission parameters for each of the plurality of transmissions or receptions.

[0204] In some embodiments, the one or more transmission parameters include at least one of a demodulation reference signal (DMRS), a port indication, and a transmission configuration indication (TCI) state.

[0205] In some embodiments, the configuration includes a radio network temporary identifier (RNTI), or the RNTI is derivable from the configuration, and the network node circuit uses the RNTI to scramble the CRC attached to the DCI, wherein the RNTI alone or in combination with at least one indicator in the DCI signaling indicates a value of at least one of a plurality of values ​​of the transmission parameter.

[0206] In some embodiments, the configuration includes a first DMRS port indication table and a second DMRS port indication table, and the circuit uses a radio network temporary identifier (RNTI) included in the configuration or derivable from the configuration to scramble a cyclic redundancy check (CRC) attached to the DCI, wherein the RNTI indicates that the second DMRS port indication table is to be used for at least one of the multiple transmissions or receptions.

[0207] In some embodiments, the indicator indicates a first value of multiple values ​​of the TCI state, and the RNTI is one of K RNTI candidates, wherein a first of the K RNTI candidates is included in the configuration, and the RNTI candidate is K subsequent integers respectively indicating K configured TCI states signaled by radio resource control (RRC).

[0208] According to some embodiments, at least one of the indicator and the RNTI indicates a multi-TRP TCI state, the multi-TRP state including more than one TCI state for sending to or receiving from more than one TRP, respectively.

[0209] In some embodiments, the configuration includes a set of mappings between TRP sets and value candidate sets of value candidates for one or more transmission parameters, and at least one of the one or more indicators indicates a mapping between one of the TRP sets in the mapped set to be used as multiple TRPs and one of the value candidate sets for multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0210] In some embodiments, the set of mappings includes M mappings of N statically configured mappings, M is equal to or less than N, and the transceiver sends M indices indicating the M mappings signaled by the RRC, respectively, and the at least one indicator indicates an index of a mapping between multiple TRPs and multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0211] In some embodiments, the transceiver sends the contents of a mapping table defining the set of mappings, the contents of the mapping table being signaled by RRC.

[0212] For example, the transceiver transmits an enabling parameter indicating that a plurality of transmissions or receptions are to be performed based on a set of mappings, and the enabling parameter is signaled by RRC.

[0213] For example, the circuit scrambles a cyclic redundancy check (CRC) appended to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, wherein the RNTI indicates that multiple transmissions or receptions are to be performed based on the mapped set.

[0214] In some embodiments, the transceiver transmits a signal including RRC.

[0215] The present disclosure also provides a communication method for a user equipment, comprising: receiving downlink control information (DCI) on a physical downlink control channel (PDCCH) for scheduling multiple transmissions or receptions between a UE and multiple transmission and reception points (TRPs) on multiple channels, the DCI comprising one or more indicators indicating one or more corresponding transmission parameters; obtaining multiple values ​​of the one or more transmission parameters respectively based on the one or more indicators and based on a configuration; and performing the multiple transmissions or receptions using a corresponding one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

[0216] In some embodiments, the one or more transmission parameters include at least one of a demodulation reference signal (DMRS), a port indication, and a transmission configuration indication (TCI) state.

[0217] In some embodiments, the configuration includes a radio network temporary identifier (RNTI), or the RNTI is derivable from the configuration, and the method includes descrambling a CRC attached to the DCI using the RNTI, wherein the RNTI alone or in combination with at least one indicator in the DCI signaling indicates a value of at least one of a plurality of values ​​of a transmission parameter.

[0218] In some embodiments, the configuration includes a first DMRS port indication table and a second DMRS port indication table, the method includes descrambling a CRC attached to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, wherein the RNTI indicates that the second DMRS port indication table is to be used for at least one of a plurality of transmissions or receptions, and performing at least one of the plurality of transmissions or receptions using the second DMRS port indication table based on a result of successfully performing descrambling of the CRC using the RNTI, wherein the indicator indicates a DMRS port indication from the second DMRS port indication table.

[0219] For example, the indicator indicates a first value of multiple values ​​of the TCI state, the RNTI is one of K RNTI candidates, wherein a first of the K RNTI candidates is included in the configuration, and the RNTI candidate is K subsequent integers respectively indicating K configured TCI states signaled by a radio resource control (RRC), and the method includes determining the first value of the TCI state based on the indicator, and obtaining a second value from the multiple values ​​of the TCI state based on a result of successfully descrambling a CRC attached to the DCI using the RNTI candidate as the RNTI, the RNTI candidate indicating the TCI state to be used as a second value of the K TCI states.

[0220] For example, the indicator indicates a first value among multiple values ​​of the TCI state, the method includes descrambling the CRC attached to the DCI using a radio network temporary identifier (RNTI) included in the configuration or derivable from the configuration, the RNTI is one of K RNTI candidates, wherein a first of the K RNTI candidates is included in the configuration, and the RNTI candidate is K subsequent integers respectively indicating K configured TCI states signaled by the RRC, and the method includes determining the first value of the TCI state based on the indicator, and obtaining a second value from the multiple values ​​of the TCI state based on a result of successfully descrambling the CRC attached to the DCI using the RNTI candidate as the RNTI, the RNTI candidate indicating the TCI state to be used as a second value among the K TCI states.

[0221] According to some embodiments, at least one of the indicator and the RNTI indicates a multi-TRP TCI state, and the multi-TRP TCI state includes more than one TCI state for sending to or receiving from more than one TRP, respectively.

[0222] In some embodiments, the configuration includes a set of mappings between TRP sets and value candidate sets of value candidates for one or more transmission parameters, and at least one of the one or more indicators indicates a mapping between one of the TRP sets in the mapped set to be used as multiple TRPs and one of the value candidate sets for multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0223] In some embodiments, the set of mappings includes M mappings of N statically configured mappings, M is equal to or less than N, and the transceiver receives M indices indicating the M mappings signaled by the RRC, respectively, and the at least one indicator indicates an index of a mapping between multiple TRPs and multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0224] In some embodiments, the method comprises receiving contents of a mapping table defining a set of mappings, the contents of the mapping table being signaled by RRC.

[0225] For example, the method includes receiving an enabling parameter indicating that multiple transmissions or receptions are to be performed based on a mapped set, and the enabling parameter is signaled by RRC, and determining based on the enabling parameter that multiple transmissions or receptions are to be performed based on the mapped set.

[0226] For example, the method includes descrambling a cyclic redundancy check (CRC) attached to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, wherein the RNTI indicates that multiple transmissions or receptions are to be performed based on a mapped set, and determining that multiple transmissions or receptions are to be performed based on the mapped set based on a result of successfully descrambling the CRC attached to the DCI using the RNTI.

[0227] In some embodiments, the method includes receiving a signal including an RRC.

[0228] In addition, the present disclosure provides a communication method for a network node, comprising: determining multiple values ​​of one or more transmission parameters for multiple transmissions and receptions between multiple transmission and reception points (TRPs) and user equipment (UE) on multiple channels; generating downlink control information (DCI) for scheduling multiple transmissions or receptions, the DCI comprising one or more indicators indicating one or more corresponding transmission parameters, wherein the one or more indicators indicate multiple values ​​of the one or more transmission parameters in combination with a configuration; and sending the DCI on a physical downlink control channel (PDCCH).

[0229] For example, the method includes performing at least one of the plurality of transmissions or receptions using a corresponding value of a plurality of values ​​of one or more transmission parameters for each of the plurality of transmissions or receptions.

[0230] In some embodiments, the one or more transmission parameters include at least one of a demodulation reference signal (DMRS), a port indication, and a transmission configuration indication (TCI) state.

[0231] In some embodiments, the configuration includes a radio network temporary identifier (RNTI), or the RNTI is derivable from the configuration, and the method includes scrambling a CRC appended to the DCI using the RNTI, wherein the RNTI alone or in combination with at least one indicator in the DCI signaling indicates a value of at least one of a plurality of values ​​of a transmission parameter.

[0232] In some embodiments, the configuration includes a first DMRS port indication table and a second DMRS port indication table, and the method includes scrambling a cyclic redundancy check (CRC) attached to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, wherein the RNTI indicates that the second DMRS port indication table is to be used for at least one of the multiple transmissions or receptions.

[0233] In some embodiments, the indicator indicates a first value of multiple values ​​of the TCI state, and the RNTI is one of K RNTI candidates, wherein a first of the K RNTI candidates is included in the configuration, and the RNTI candidate is K subsequent integers respectively indicating K configured TCI states signaled by radio resource control (RRC).

[0234] According to some embodiments, at least one of the indicator and the RNTI indicates a multi-TRP TCI state, the multi-TRP state including more than one TCI state for sending to or receiving from more than one TRP, respectively.

[0235] In some embodiments, the configuration includes a set of mappings between TRP sets and value candidate sets of value candidates for one or more transmission parameters, and at least one of the one or more indicators indicates a mapping between one of the TRP sets in the mapped set to be used as multiple TRPs and one of the value candidate sets for multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0236] In some embodiments, the set of mappings includes M mappings of N statically configured mappings, M is equal to or less than N, and the method includes sending M indices indicating the M mappings signaled by RRC, respectively, and the at least one indicator indicates an index of a mapping between multiple TRPs and multiple values ​​of one or more transmission parameters to be used for multiple transmissions or receptions.

[0237] In some embodiments, the method includes sending contents of a mapping table defining a set of mappings, the contents of the mapping table being signaled by RRC.

[0238] For example, the method includes sending an enabling parameter, the enabling parameter indicating that a plurality of transmissions or receptions are to be performed based on a set of mappings, and the enabling parameter is signaled by RRC.

[0239] For example, the method includes scrambling a cyclic redundancy check (CRC) appended to the DCI using a radio network temporary identifier (RNTI) included in or derivable from the configuration, wherein the RNTI indicates that a plurality of transmissions or receptions are to be performed based on a set of mappings.

[0240] In some embodiments, the method includes sending a signal including an RRC.

[0241] In summary, the present disclosure relates to a user equipment (UE), a network node, and a communication method for the UE and the network node, respectively. The UE includes: a transceiver, receiving downlink control information (DCI) for scheduling multiple transmissions or receptions between the UE and multiple transmission and reception points (TRPs) on multiple channels on a physical downlink control channel (PDCCH), the DCI including one or more indicators indicating one or more corresponding transmission parameters; and a circuit, based on the one or more indicators and based on a configuration, obtains multiple values ​​of the one or more transmission parameters, respectively. The transceiver performs multiple transmissions or receptions using a corresponding one of the multiple values ​​of the one or more transmission parameters for each of the multiple transmissions or receptions.

Claims

1. A communication device, comprising: circuitry that determines one or more transmission parameters based on the one or more indicators and a configuration associated with a transmission configuration indication (TCI) field; a transceiver that uses one or more transmission parameters to perform transmission or reception, in a case where the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, In case the configuration associated with the TCI field is for a multi-TCI case, determining the one or more transmission parameters by using a second table, and The indexes in the second table are indicated by the same number of bits used to indicate the indexes in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

2. The communication device according to claim 1, wherein: The one or more transmission parameters include at least one of a demodulation reference signal DMRS antenna port and a TCI state.

3. The communication device according to claim 1, wherein The first table includes a first DMRS port indication table, and the second table includes a second DMRS port indication table.

4. The communication device according to claim 1, wherein: The number of entries in the second table is greater than the number of entries in the first table.

5. The communication device according to claim 1, wherein: The entries modified or added in the second table relative to the first table indicate a plurality of DMRS antenna ports.

6. The communication device according to claim 1, wherein: In case a codeword is enabled, the second table is enabled.

7. The communication device according to claim 1, wherein: The second table indicates the number of DMRS demodulation reference signal CDM code division multiplexing groups without data, and indicates a DMRS port.

8. The communication device according to claim 1, wherein: The value of the entry in the second table is associated with a single DMRS antenna port, and the values ​​of other entries in the second table are associated with multiple DMRS antenna ports.

9. The communication device according to claim 1, wherein: Twelve entries indexed 0-11 in the second table are included in the first table and indexed 0-11, while the entry indexed 12 in the second table is not included in the first table.

10. The communication device according to claim 1, wherein: In the first table and the second table, the index is represented by 4 bits.

11. A base station, comprising: A circuit that determines one or more transmission parameters and generates downlink control information DCI for scheduling transmission or reception using the one or more transmission parameters, the DCI including one or more indicators and a transmission configuration indication TCI field; A transceiver, which sends DCI and performs transmission or reception, in a case where the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, In case the configuration associated with the TCI field is for a multi-TCI case, determining the one or more transmission parameters by using a second table, and The indexes in the second table are indicated by the same number of bits used to indicate the indexes in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

12. A communication method for a communication device, comprising: determining one or more transmission parameters based on the one or more indicators and a configuration associated with a transmission configuration indication (TCI) field; as well as performing the sending or receiving using the one or more transmission parameters, and in a case where the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, In case the configuration associated with the TCI field is for a multi-TCI case, determining the one or more transmission parameters by using a second table, and The indexes in the second table are indicated by the same number of bits used to indicate the indexes in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

13. A communication method for a base station, comprising: Determine one or more transmission parameters and generate downlink control information DCI for scheduling transmission or reception using the one or more transmission parameters, wherein the DCI includes one or more indicators and a transmission configuration indication TCI field; Send DCI and perform transmission or reception, in a case where the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, In case the configuration associated with the TCI field is for a multi-TCI case, determining the one or more transmission parameters by using a second table, and The indexes in the second table are indicated by the same number of bits used to indicate the indexes in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

14. An integrated circuit controlling a process of a communication device, the process comprising: determining one or more transmission parameters based on the one or more indicators and a configuration associated with a transmission configuration indication (TCI) field; as well as performing the sending or receiving using the one or more transmission parameters, and in a case where the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, In case the configuration associated with the TCI field is for a multi-TCI case, determining the one or more transmission parameters by using a second table, and The indexes in the second table are indicated by the same number of bits used to indicate the indexes in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

15. An integrated circuit controlling a process of a base station, the process comprising: Determine one or more transmission parameters, and use the one or more transmission parameters to generate downlink control information DCI for scheduling transmission or reception, wherein the DCI includes one or more indicators and a transmission configuration indication TCI field; Send DCI and perform transmission or reception, in a case where the configuration associated with the TCI field is for a single TCI case, determining the one or more transmission parameters by using a first table, In case the configuration associated with the TCI field is for a multi-TCI case, determining the one or more transmission parameters by using a second table, and The indexes in the second table are indicated by the same number of bits used to indicate the indexes in the first table, and the number of indexes in the second table is the same as the number of indexes in the first table.

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