A downlink data transmission method, a terminal device and a storage medium

Abstract

The application discloses a downlink data transmission method, comprising: a terminal device determines a transmission configuration indication (TCI) state corresponding to downlink data transmission based on downlink control information (DCI); determines a redundancy version (RV) value corresponding to the downlink data transmission based on the DCI; and receives the downlink data based on the TCI state and the RV value. The application also provides a terminal device and a storage medium.

Description

[0001] This application is a divisional application of Chinese patent application No. 201980092837.4 (corresponding to PCT international application No. PCT / CN2019 / 080256), filed on March 28, 2019, entitled "A Downlink Data Transmission Method, Terminal Equipment and Storage Medium". Technical Field

[0002] This invention relates to the field of wireless communication technology, and in particular to a downlink data transmission method, terminal device, and storage medium. Background Technology

[0003] In New Ration (NR) systems, there are scenarios where multiple Transmission Reception Points (TRPs), antenna panels, or beams simultaneously transmit downlink data to terminal devices. The terminal device detects a Physical Downlink Control Channel (PDCCH) to obtain Downlink Control Information (DCI), which indicates the simultaneous data transmission across multiple TRPs, antenna panels, or beams. Related technologies include three implementation methods for downlink data transmission: transmitting data on a single TRP across multiple time slots, transmitting data through multiple TRPs, and transmitting data through multiple TRPs across multiple slots. However, there is currently no solution for how to handle downlink data transmission when downlink data transmission methods switch or are used in combination. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of the present invention provide a downlink data transmission method, a terminal device, and a storage medium, enabling the terminal device to switch between different downlink data transmission methods or use a mixture of different downlink data transmission methods based on DCI.

[0005] In a first aspect, embodiments of the present invention provide a downlink data transmission method, comprising: a terminal device determining a Transmission Configuration Indicator (TCI) state corresponding to downlink data transmission based on downlink control information; determining a Redundancy Version (RV) value corresponding to downlink data transmission based on the downlink control information; and receiving downlink data based on the TCI state and the RV value.

[0006] Secondly, embodiments of the present invention provide a terminal device, the terminal device comprising: a processing unit configured to determine a transmission configuration indication state corresponding to downlink data transmission based on downlink control information; and to determine a redundancy version value corresponding to downlink data transmission based on the downlink control information; and a transceiver unit configured to receive downlink data based on the transmission configuration indication state and the redundancy version value.

[0007] Thirdly, embodiments of the present invention provide a terminal device, including: a processor and a memory for storing a computer program capable of running on the processor, wherein, when the processor runs the computer program, it executes the steps of the downlink data transmission method executed by the terminal device described above.

[0008] Fourthly, embodiments of the present invention provide a storage medium storing an executable program, wherein when the executable program is executed by a processor, it implements the downlink data transmission method executed by the aforementioned terminal device.

[0009] The downlink data transmission method provided in this invention involves a terminal device determining a transmission configuration indication state corresponding to downlink data transmission based on downlink control information; determining a redundancy version value corresponding to downlink data transmission based on the downlink control information; and receiving downlink data based on the transmission configuration indication state and the redundancy version value. Thus, by determining the redundancy version value and transmission configuration indication state for data transmission, flexible switching or mixed use of three different downlink data transmission methods is achieved when transmitting downlink data in multiple time slots, using different TRPs, or using different TRPs in different time slots, when transmitting downlink data in multiple TRPs, multiple antenna panels, or multiple beams. Furthermore, determining the transmission configuration indication state and redundancy version value in multiple different ways reduces the complexity of the terminal device receiving downlink transmission data, reduces signaling overhead, achieves better diversity, and reduces latency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of a downlink data transmission method according to the present invention;

[0011] Figure 2 This is a schematic diagram of another downlink data transmission method according to the present invention;

[0012] Figure 3 This is a schematic diagram of the structure of multiple TRPs transmitting data simultaneously according to the present invention;

[0013] Figure 4 This is a schematic diagram of the structure of multiple beams transmitting data simultaneously according to the present invention;

[0014] Figure 5This is a schematic diagram of the TCI state configuration method of the present invention;

[0015] Figure 6 This is a schematic diagram of the composition structure of the communication system according to an embodiment of the present invention;

[0016] Figure 7 A schematic diagram of an optional processing flow for the downlink data transmission method provided in an embodiment of the present invention;

[0017] Figure 8 TCI status illustration provided for embodiments of the present invention Figure 1 ;

[0018] Figure 9 TCI status illustration provided for embodiments of the present invention Figure 2 ;

[0019] Figure 10 This is a schematic diagram illustrating how a terminal device determines the corresponding TCI state for each downlink data transmission according to a third preset strategy, as described in an embodiment of the present invention.

[0020] Figure 11 A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 1 ;

[0021] Figure 12 A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 2 ;

[0022] Figure 13 A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 3 ;

[0023] Figure 14 A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 4 ;

[0024] Figure 15 A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 5 ;

[0025] Figure 16 A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 6 ;

[0026] Figure 17 A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 7 ;

[0027] Figure 18 A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 8 ;

[0028] Figure 19 This is a schematic diagram of the composition structure of a terminal device provided in an embodiment of the present invention;

[0029] Figure 20 This is a schematic diagram of the hardware composition structure of a terminal device provided in an embodiment of the present invention. Detailed Implementation

[0030] To gain a more detailed understanding of the features and technical content of the embodiments of the present invention, the implementation of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of the present invention.

[0031] Before providing a detailed description of the embodiments of the present invention, a brief explanation of the downlink data transmission is provided.

[0032] In NR systems, the following can be used: Figure 1 The diagram illustrates one downlink data transmission method, which transmits data across multiple time slots using a single TRP; alternatively, methods such as... can also be used. Figure 2 Another downlink data transmission method shown involves transmission over multiple TRPs; data can also be transmitted across multiple slots via multiple TRPs. A schematic diagram illustrating the structure of multiple TRPs transmitting data simultaneously is shown below. Figure 3 As shown, the network device transmits data to the terminal device simultaneously through TRP1 and TRP2; a schematic diagram of the structure of multiple beams transmitting data simultaneously is shown below. Figure 4 As shown, the network device transmits data with the terminal device through beam1 and beam2. Among the optional schemes for simultaneous data transmission across multiple TRPs, antenna panels, or beams, in addition to the terminal device obtaining a DCI indicating simultaneous data transmission across multiple TRPs, antenna panels, or beams by detecting a PDCCH, the scheme also includes: the terminal device receiving different PDCCHs from different TRPs, antenna panels, or beams, detecting the corresponding DCI on each PDCCH, and each DCI indicating relevant indication information for a corresponding data transmission method.

[0033] For scenarios where a terminal device obtains a DCI indicating simultaneous data transmission on multiple TRPs, multiple antenna panels, or multiple beams by detecting a single PDCCH, the terminal device only needs to detect one PDCCH. Therefore, the control channel detection complexity is low, but it is necessary to be able to quickly exchange information between different antenna panels / TRPs / beams.

[0034] For scenarios where a terminal device receives different PDCCHs from different TRPs, antenna panels, or beams, and detects the corresponding DCI on each PDCCH, the terminal device needs to detect multiple PDCCHs simultaneously on the same carrier. This increases the complexity of detection, but improves flexibility and robustness.

[0035] The terminal device receives different PDCCHs from different TRPs, antenna panels, or beams, and the scenarios in which the corresponding DCI is detected on each PDCCH include at least the following:

[0036] 1. When multiple TRPs belong to the same cell, the backhaul between TRPs is ideal (i.e., they can quickly and dynamically exchange information).

[0037] 2. When multiple TRPs belong to the same cell, the backhaul between TRPs is not ideal (i.e., TRPs cannot exchange information quickly and can only exchange data relatively slowly).

[0038] 3. When multiple TRPs belong to different cells, backhaul between TRPs is ideal.

[0039] 4. When multiple TRPs belong to different cells, backhaul between TRPs is not ideal.

[0040] 5. When multiple beam / antenna panels belong to the same cell, the backhaul between beam / antenna panels is ideal (i.e., they can quickly and dynamically exchange information).

[0041] 6. When multiple beam / antenna panels belong to the same cell, the backhaul between beam / antenna panels is not ideal (i.e., TRPs cannot exchange information quickly and can only perform relatively slow data exchange).

[0042] 7. When multiple beam / antenna panels belong to different cells, backhaul between beam / antenna panels is ideal.

[0043] 8. When multiple beam / antenna panels belong to different cells, the backhaul between beam / antenna panels is not ideal.

[0044] The following is a brief explanation of the quasi-co-located (QCL) indication for downlink data transmission.

[0045] To improve reception performance when receiving data, terminal devices can leverage the characteristics of the transmission environment to refine the reception algorithm. For example, the statistical characteristics of the channel can be used to optimize the design and parameters of the channel estimator. In NR systems, these characteristics of data transmission are represented by QCL states (QCL-Info).

[0046] If downlink transmissions originate from different TRP / Antenna panels / beams, the characteristics of the transmission environment may vary. Therefore, in NR systems, network devices, when transmitting downlink control or data channels, will indicate the corresponding QCL-Info status information to the terminal via the Transmission Configuration Indicator (TCI) status. A TCI status can include: a TCI status ID identifying the TCI status and QCL information 1; optionally, a TCI status can also include QCL information 2. Each QCL information contains the following information:

[0047] 1) QCL type configuration, wherein the QCL type configuration can be one of QCL type A, QCL type B, QCL type C or QCL type D;

[0048] 2) QCL reference signal configuration, which includes: the cell identifier (ID) of the reference signal, the BandWidth Part (BWP) ID, and the identifier of the reference signal; wherein, the identifier of the reference signal can be the Channel State Information-Reference Signal (CSI-RS) resource ID or the Synchronization Signal Block (SSB) index.

[0049] Specifically, if both QCL information 1 and QCL information 2 are configured with at least one QCL information, the QCL type must be one of type A, type B, and type C; if another QCL information is to be configured, the QCL type of that other QCL information must be QCL type D. The definitions of different QCL type configurations are as follows:

[0050] 'QCL-TypeA':{Doppler shift,Doppler spread,average delay,delay spread}

[0051] 'QCL-TypeB':{Doppler shift,Doppler spread}

[0052] 'QCL-TypeC':{Doppler shift,average delay}

[0053] 'QCL-TypeD':{Spatial Rx parameter}

[0054] The relevant configuration in the existing protocol 38.331 is as follows:

[0055]

[0056] The TCI status will now be briefly explained.

[0057] In NR systems, network devices can indicate corresponding TCI states for downlink signals or downlink channels. If the network device configures the QCL reference signal of the target downlink channel or target downlink signal as a reference SSB or reference CSI-RS resource via the TCI state, and the QCL type is configured as type A, type B, or type C, then the terminal device can assume that the target downlink signal and the reference SSB or reference CSI-RS resource have the same large-scale parameters, which are determined by the QCL type configuration. Similarly, if the network device configures the QCL reference signal of the target downlink channel or downlink signal as a reference SSB or reference CSI-RS resource via the TCI state, and the QCL type is configured as type D, then the terminal device can use the same receive beam (i.e., spatial Rx parameter) as when receiving the reference SSB or reference CSI-RS resource to receive the target downlink signal. Typically, the target downlink channel (or target downlink signal) and its reference SSB or reference CSI-RS resource are transmitted on the network device side by the same TRP, the same antenna panel, or the same beam. If the transmission TRP, transmission antenna panel, or transmission beam of two downlink signals or downlink channels are different, different TCI states are usually configured.

[0058] For downlink control channels, the TCI status can be indicated via Radio Resource Control (RRC) signaling or a combination of RRC and Media Access Control (MAC) signaling. For downlink data channels, the TCI status configuration method is as follows: Figure 5 As shown, the available TCI state set is indicated by RRC signaling, and some of the TCI states are activated by MAC signaling. Finally, one or two TCI states are indicated from the activated TCI states by the TCI state indication field in the DCI for the PDSCH of the DCI scheduling.

[0059] The following is a brief explanation of the Demodulation Reference Signal (DMRS). In NR, there are two types of DMRS:

[0060] 1. Type 1DMRS, Type 1DMRS has the following attributes:

[0061] a. Supports two Code Division Multiplexing (CDM) groups;

[0062] b. If one Orthogonal Frequency Division Multiplexing (OFDM) symbol is used, a maximum of four DMRS ports are supported; among which ports {0,1} belong to CDM group 0, and ports {2,3} belong to CDM group 1.

[0063] c. If two OFDM symbols are used, a maximum of eight DMRS ports are supported, of which ports {0,1,4,5} belong to CDM group 0 and ports {2,3,6,7} belong to CDM group 1.

[0064] 2. Type 2DMRS, Type 2DMRS has the following properties:

[0065] a. Supports 3 CDM groups;

[0066] b. If one OFDM symbol is used, a maximum of 6 DMRS ports are supported; among which ports {0,1} belong to CDM group0, ports {2,3} belong to CDM group1, and ports {4,5} belong to CDM group2.

[0067] c. If two OFDM symbols are used, a maximum of 12 DMRS ports are supported, of which ports {0,1,6,7} belong to CDM group 0, ports {2,3,8,9} belong to CDM group 1, and ports {4,5,10,11} belong to CDM group 2.

[0068] When transmitting downlink data, the network device instructs the terminal device which ports were used for this transmission. If data is sent from different TRPs / Antenna panels / beams, ports within the same CDM group will be sent from a single TRP / panel / beam; therefore, their corresponding characteristics will be similar ('QCL-TypeA', 'QCL-TypeB', 'QCL-TypeC', 'QCL-TypeD'); correspondingly, they can correspond to the same TCI state. However, different CDM groups may send data from different TRPs / Antenna panels / beams, which can correspond to different TCI states.

[0069] In this embodiment of the invention, the downlink data transmission method can be applied to multiple downlink data transmissions; for example, to improve the transmission reliability of PDSCH, PDSCH is repeatedly transmitted, that is, PDSCH carrying the same data is transmitted multiple times through different time slots / TRP / Antenna panel / beam / Redundancy Version (RV), etc., thereby obtaining diversity gain and reducing the probability of false detection (BLER).

[0070] This invention provides a downlink data transmission method. The downlink data transmission method of this application embodiment can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, or 5G system, etc.

[0071] For example, the communication system 100 used in the embodiments of this application is as follows: Figure 6 As shown. The communication system 100 may include network device 110, which may be a device that communicates with terminal device 120 (or a communication terminal, terminal). Network device 110 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within that coverage area. Optionally, network device 110 may be a base station (BTS) in a GSM or CDMA system, a base station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, a base station (gNB) in a New Radio (NR) / 5G system, or a radio controller in a Cloud Radio Access Network (CRAN). Alternatively, the network device may be a mobile switching center, relay station, access point, vehicle-mounted equipment, wearable device, hub, switch, bridge, router, network-side equipment in a 5G network, or network equipment in a future evolved Public Land Mobile Network (PLMN), etc.

[0072] The communication system 100 also includes at least one terminal device 120 located within the coverage area of ​​the network device 110. As used herein, "terminal device" includes, but is not limited to, devices configured to receive / transmit communication signals via wired connections, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as for cellular networks, Wireless Local Area Networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM radio transmitters; and / or other terminal devices. Terminal devices configured to communicate via a wireless interface may be referred to as "wireless communication terminal," "wireless terminal," or "mobile terminal." Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communications system (PCS) terminals that can combine cellular radiotelephony with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notebooks, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or handheld receivers or other electronic devices that include radiotelephone transceivers. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, user terminals, terminals, wireless communication equipment, user agents, or user equipment. Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in future PLMNs, etc.

[0073] Optionally, the terminal devices 120 can communicate directly with each other via Device to Device (D2D).

[0074] Alternatively, a 5G system or 5G network may also be referred to as an NR system or NR network.

[0075] Figure 6 An exemplary embodiment shows a network device and two terminal devices. Optionally, the communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area. This application embodiment does not limit this.

[0076] Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment.

[0077] It should be understood that devices with communication functions in the network / system of this application embodiment can be referred to as communication devices. Figure 6 Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as network controllers, mobility management entities and other network entities. This application embodiment does not limit this.

[0078] The optional processing flow of the downlink data transmission method provided in the embodiments of the present invention is as follows: Figure 7 As shown, it includes the following steps:

[0079] Step S201: The terminal device determines the TCI status corresponding to the downlink data transmission based on the DCI.

[0080] In this embodiment of the invention, the DCI is sent from the network device to the terminal device, and the DCI includes antenna port indication information and TCI status indication information; accordingly, the terminal device determines the TCI status corresponding to the downlink data transmission based on the antenna port indication information and TCI status indication information in the DCI.

[0081] In practical implementation, the terminal device first determines K TCI states corresponding to this scheduling based on the TCI state indication information in the DCI, where K is greater than 1; then, according to the DMRS port set to which the DMRS port belongs, it determines the TCI state corresponding to each DMRS port in each downlink data transmission in the time domain from the K TCI states, where the DMRS port is indicated by the antenna port indication information in the DCI. In this way, transmitting downlink data simultaneously from multiple TRPs can reduce the number of repetitions in the time domain, thereby reducing system latency.

[0082] The following uses two TRP(N) TRP=2), with the number of downlink data transmissions in the time domain M=4, the number of TCI states K=2, and the number of DMRS port sets T=1 or 2 (T=3 in some additional cases), this explains how to determine the DMRS port set to which the DMRS port belongs.

[0083] In some embodiments, the DMRS port set to which the DMRS port belongs is determined by the terminal device based on the DMRS CDM group corresponding to the DMRS port indicated by the port indication information in the DCI, and the correspondence between the DMRS CDM group and the DMRS port set. For example, the port indication information in the DCI indicates that the DMRS port corresponds to 2 or 3 DMRSCDM groups, and the DMRS ports corresponding to different DMRS CDM groups belong to 2 DMRS port sets (DMRS port set 0 and DMRS port set 1), respectively. The relationship between the DMRS CDM group number and DMRS port set 0 and DMRS port set 1 can be determined by the terminal device according to pre-defined rules, or it can be determined by the terminal device according to configuration signaling sent by the network device. Optionally, the relationship between the DMRS CDM group number and DMRS port set 0 and DMRS port set 1 includes at least one of the following:

[0084] 1. The DMRS port corresponding to DMRS CDM group0 corresponds to DMRS port set 0, and the DMRS port corresponding to DMRS CDM group1 corresponds to DMRS port set 1; or the DMRS port corresponding to DMRS CDM group0 corresponds to DMRS port set 1, and the DMRS port corresponding to DMRS CDM group1 corresponds to DMRS port set 0. This can be understood as the larger DMRS CDM group number corresponding to the larger DMRS port combination number; or the larger DMRS CDM group number corresponding to the smaller DMRS port combination number.

[0085] 2. The DMRS ports of DMRS CDM group 0 and DMRS CDM group 2 correspond to DMRS port set 0, and the DMRS ports of DMRS CDM group 1 correspond to DMRS port set 1; or the DMRS ports of DMRS CDM group 0 and DMRS CDM group 2 correspond to DMRS port set 1, and the DMRS ports of DMRS CDM group 1 correspond to DMRS port set 0.

[0086] 3. The DMRS ports of DMRS CDM group 0 correspond to DMRS port set 0, the DMRS ports of DMRS CDM group 1 correspond to DMRS port set 1, and the DMRS ports of DMRS CDM group 2 correspond to DMRS port set 2.

[0087] In other embodiments, the DMRS port set to which the DMRS port belongs is determined by the terminal device based on first indication information sent by the network device. This can be understood as the network device sending first indication information to the terminal device, and the terminal device determining the DMRS port set to which the DMRS port belongs based on the first indication information.

[0088] In specific implementation, when the first indication information is configured, the terminal device determines the DMRS port set to which the DMRS port belongs based on the DMRS CDM group corresponding to the DMRS port indicated by the port indication information in the DCI, and the correspondence between the DMRS CDM group and the DMRS port set. For example, true or false indicates whether the first indication information is configured (false is the default value, i.e., the default value is false when the first indication information is not configured). When the field corresponding to the information received by the terminal device is true, it indicates that the first indication information is configured. At this time, the DMRS port set to which the DMRS port belongs is determined based on the above embodiments of the present invention.

[0089] Alternatively, when the first indication information is configured, the DMRS port set to which the DMRS port belongs is determined by the terminal device based on a first preset strategy. Optionally, the first preset strategy is: the DMRS ports included in each DMRS port set. For example, DMRS port set 0 includes DMRS ports x1, x2, ..., and DMRS port set 1 includes DMRS ports y1, y2, ...; or DMRS port set 0 includes DMRS ports x1 and x2, and DMRS port set 1 includes DMRS port y1.

[0090] Alternatively, when the first indication information is not configured, all DMRS ports belong to a DMRS port set. For example, when the corresponding field in the information received by the terminal device is not configured, it indicates that the first indication information is not configured. In this case, the terminal device determines that all DMRS ports belong to a DMRS port set.

[0091] Alternatively, when the value corresponding to the first indication information is the first value, all DMRS ports belong to a single DMRS port set. The first value can be flexibly set, such as being set to 1.

[0092] Alternatively, when the value corresponding to the first indication information is the second value, the DMRS port set to which the DMRS port indicated by the port indication information in the DCI belongs is determined based on a pre-set correspondence between DMRS ports and DMRS port sets or a preset strategy. The second value can be flexibly set, such as being set to 0.

[0093] Alternatively, the DMRS port set to which the DMRS port belongs is determined by the terminal device based on the first indication information. The first indication information indicates: the DMRS ports included in each DMRS port set; for example, DMRS port set 0 includes DMRS ports x1, x2, ..., and DMRS port set 1 includes DMRS ports y1, y2, ...; or DMRS port set 0 includes DMRS ports x1 and x2, and DMRS port set 1 includes DMRS port y1; or DMRS port set 0 includes DMRS ports x1 and x2 (by default, other ports belong to DMRS port set 1).

[0094] In this embodiment of the invention, the DMRS port set to which the DMRS port belongs is determined by the first indication information sent by the network device, which can improve the flexibility of configuring the TCI status corresponding to downlink data transmission.

[0095] Having determined the DMRS port set to which the DMRS port belongs, the following explains how the terminal device determines the TCI status corresponding to the DMRS port.

[0096] Before the terminal device determines the TCI state corresponding to the DMRS port, the network device sends a second indication information to the terminal device. Based on the second indication information, the terminal device determines the number of times the downlink data will be transmitted in the time domain. Optionally, the second indication information is the Physical Downlink Shared Channel Aggregation Factor (PDSCH-Aggregation Factor).

[0097] In some embodiments, different DMRS port sets correspond to different TCI states for their corresponding DMRS ports; the TCI state of each DMRS port remains constant during each downlink data transmission in the time domain. For example, the terminal device determines that the DMRS port corresponding to DMRS port set 0 corresponds to TCI state 0, and the DMRS port corresponding to DMRS port set 1 corresponds to TCI state 1; in M ​​transmissions in the time domain, the terminal device receives downlink data according to this correspondence. (TCI state illustration) Figure 1 ,like Figure 8 TCI status diagram shown Figure 1In this context, TCI state 0 corresponds to TRP0 and DMRS port set 0, while TCI state 1 corresponds to TRP1 and DMRS port set 1. During M (M=4) data transmissions, the terminal device consistently receives downlink data based on the correspondence between TCI state 0 and DMRS port set 0, and consistently based on the correspondence between TCI state 1 and DMRS port set 1. This simplifies the downlink data reception process for the terminal device.

[0098] In other embodiments, the terminal device determines the TCI state corresponding to each DMRS port in the downlink data transmission according to a second preset strategy based on the TCI state corresponding to the previous downlink data transmission. The second preset strategy includes at least one of the following: TCI state offset, TCI state cycling, and TCI state swapping. For example, the terminal device determines the TCI state corresponding to DMRS ports belonging to different DMRS port sets during the first downlink data transmission; for instance, the DMRS port corresponding to DMRS port set 0 corresponds to TCI state 0, and the DMRS port corresponding to DMRS port set 1 corresponds to TCI state 1. In M transmissions in the time domain, the terminal device changes the correspondence between the current DMRS port and TCI state according to the second preset strategy based on the correspondence in the previous transmission, and performs corresponding data reception based on the correspondence during this transmission. Thus, by transmitting from different TRPs through a DMRS port set in different transmissions, the corresponding downlink data is also transmitted from different TRPs in different transmissions, achieving better diversity. Figure 9 TCI status diagram shown Figure 2 During the first and third downlink data transmissions, TCI state 0 corresponds to TRP0 and DMRS port set 0, and TCI state 1 corresponds to TRP1 and DMRS port set 1. During the second and fourth downlink data transmissions, TCI state 1 corresponds to TRP0 and DMRS port set 0, and TCI state 0 corresponds to TRP1 and DMRS port set 1.

[0099] In some embodiments, when the number of DMRS port sets is 1, the TCI state corresponding to the DMRS port in each downlink data transmission in the time domain is determined according to a third preset strategy. The third preset strategy includes at least one of the following: each downlink data transmission sequentially uses one TCI state from the TCI sequence consisting of the K TCI states; after the K TCI states are used up, the downlink data transmission repeats the order of using the K TCI states; and selects from the K TCI states the same number of TCI states as the number of times the downlink data has been transmitted in the time domain, using one TCI state sequentially in each downlink data transmission. Thus, since the terminal device does not need to receive downlink data sent by multiple TRPs simultaneously, the processing flow for receiving downlink data by the terminal device is simplified. In specific implementations, if M is greater than or equal to K, the third preset strategy is to sequentially use one TCI state from the TCI sequence consisting of the K TCI states in each downlink data transmission; after the K TCI states are used up, the downlink data transmission repeats the order of using the K TCI states; for example, sequentially using the K TCI states, and when the K TCI states are used up, sequentially using them starting from the first TCI state. If M is less than K, the third preset strategy is to select the same number of TCI states from the K TCI states as the number of times the downlink data has been transmitted in the time domain, and use one TCI state for each downlink data transmission sequence; for example, the first M TCI states are selected from the K TCI states and used sequentially. Alternatively, in specific implementation, the terminal device determines the corresponding TCI state diagram for each downlink data transmission according to the third preset strategy, such as... Figure 10 As shown: the TCI state corresponding to the first and third downlink data transmissions is 0, and the TCI state corresponding to the second and fourth downlink data transmissions is 1.

[0100] Step S202: Determine the RV value corresponding to the downlink data transmission based on the DCI.

[0101] Optionally, the terminal device determines the RV value corresponding to downlink data transmission based on the antenna port indication information and / or RV indication information in the DCI. In implementing this embodiment, the TCI state corresponding to the DMRS port can be determined first, followed by the RV value corresponding to downlink data transmission. When determining the TCI state of the DMRS port, the DMRS port set to which the DMRS port belongs is already obtained; therefore, when determining the RV value corresponding to downlink data transmission, only the RV indication information in the DCI is needed. Alternatively, the RV value corresponding to downlink data transmission can be determined first, followed by the TCI state of the DMRS port. In this case, the RV value corresponding to downlink data transmission needs to be determined based on the antenna port indication information and RV indication information in the DCI.

[0102] In some embodiments, the RV value corresponding to each downlink data transmission is determined based on the correspondence between the RV value in the RV indication information in the DCI and the number of downlink data transmissions; in the time domain, all DMRS ports correspond to the same RV value in each downlink data transmission. This reduces the processing flow of the terminal device for downlink data transmission. For example, in the time domain, the T DMRS port sets corresponding to one downlink data transmission correspond to the same RV value; wherein there is no overlap between the T DMRS port sets. The terminal device selects one of the Z correspondences to determine the RV value used in the nth transmission based on the redundancy version indication information in the DCI indication. Optionally, the Z correspondences can be Z correspondences between the RV value and M transmissions as specified by the protocol. As shown in Table 1, according to the NR protocol, each row in Table 1 represents the correspondence between the RV value and the M downlink data transmissions. The redundancy version indication information in the DCI indication can determine which row's correspondence is used to determine the RV value used in the nth transmission. X0, X1, X2, X3 and the redundancy version indication information values ​​0, 1, 2, 3 in the DCI can be arbitrarily combined. A typical combination is X0 = 0, X1 = 1, X2 = 2, X3 = 3.

[0103]

[0104] Table 1

[0105] As an example, the relationship between the DMRS port set and the RV value provided in this embodiment of the invention is illustrated. Figure 1 ,like Figure 11 As shown, based on the redundancy version indication information in the DCI, the terminal device determines that the RV value used for the first downlink data transmission is 2, the RV value used for the second downlink data transmission is 3, the RV value used for the third downlink data transmission is 1, and the RV value used for the fourth downlink data transmission is 0. The above correspondence will differ depending on the redundancy version indication information in the DCI.

[0106] In other embodiments, the terminal device selects the RV value corresponding to each DMRS port set to which the DMRS port belongs based on the RV indication information in the DCI; the RV value corresponding to the DMRS port set to which the DMRS port belongs remains constant in each downlink data transmission in the time domain. This simplifies the processing flow of the terminal device receiving downlink data transmissions. For example, T DMRS port sets corresponding to one downlink data transmission in the time domain may correspond to different RV values; the correspondence between the T DMRS port sets and RV values ​​remains unchanged in different downlink data transmissions in the time domain. That is, if the RV value corresponding to DMRS port set 1 is 1 in the first downlink data transmission, then the RV value corresponding to DMRS port set 1 will be 1 in each subsequent downlink data transmission. In specific implementation, the terminal device selects one of Z correspondences based on the redundancy version indication information in the DCI indication to determine the RV value corresponding to the t-th DMRS port. As shown in Table 2, taking T=2 and Z=4 as an example, each row in Tables 2-1, 2-2, and 2-3 represents the correspondence between the RV value and the T sets of DMRS ports. The redundancy version indication information in the DCI can determine which row's correspondence is used to determine the RV value corresponding to the t-th DMRS port. Among them, X0, X1, X2, X3 and the redundancy version indication information in the DCI can be arbitrarily combined with the values ​​0, 1, 2, 3.

[0107] A typical combination is X0 = 0, X1 = 1, X2 = 2, X3 = 3.

[0108]

[0109] Table 2-1

[0110]

[0111] Table 2-2

[0112]

[0113] Table 2-3

[0114] As an example, the relationship between the DMRS port set and the RV value provided in this embodiment of the invention is illustrated. Figure 2 ,like Figure 12 As shown, in the first downlink data transmission, the RV value corresponding to DMRS port set 0 is 0, and the RV value corresponding to DMRS port set 1 is 2; then in the second, third, and fourth downlink data transmissions, the RV value corresponding to DMRS port set 0 is 0, and the RV value corresponding to DMRS port set 1 is 2.

[0115] In some embodiments, the terminal device selects the RV value corresponding to each DMRS port set to which the DMRS port belongs in the previous downlink data transmission in the time domain, based on the RV indication information in the DCI. The DMRS port is indicated by the antenna port indication information in the DCI. Based on the RV value corresponding to each DMRS port set in the previous downlink data transmission, the terminal device determines the subsequent one or more downlink data transmissions according to a fourth preset strategy. The fourth preset strategy includes at least one of the following: RV value offset, position offset in the RV value sequence, and RV value swapping. This achieves better downlink data transmission performance, as different RV values ​​are used for different downlink data transmissions, fully utilizing the coding gain. For example, T DMRS port sets corresponding to one downlink data transmission in the time domain correspond to different RV values; the RV value corresponding to the DMRS port set in different downlink data transmissions in the time domain is determined according to the RV value corresponding to the previous downlink data transmission, based on the fourth preset strategy. In specific implementation, the terminal device selects one of the Z correspondences to determine the RV value corresponding to the t-th DMRS port during the first downlink data transmission based on the redundancy version indication information in the DCI indication; wherein, the Z correspondences can be the correspondence between the RV value specified by the protocol and the set of T DMRS ports.

[0116] A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 3 ,like Figure 13 As shown, taking the RV value offset under the fourth strategy as an example, the terminal device determines the RV value rv corresponding to the t-th DMRS port set in the nth downlink data transmission. n,t =rv (n-1),t +Δ t , where rv (n-1),t It is the RV value corresponding to the t-th DMRS port set in the (n-1)-th transmission, Δ t It is a positive integer representing the offset of the RV value. The algorithm also includes a modulo operation, such as rv n,t =(rv (n-1),t +Δ t mod4. A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 4 ,like Figure 14 As shown, taking the fourth strategy as an example of the position offset in the RV value sequence, the terminal device takes the RV value rv corresponding to the t-th DMRS port set in the first downlink data transmission. 1,t Then select rv according to the preset list (e.g., 0, 2, 3, 1). 0,tThe Δth, 2Δth, ... values ​​are used sequentially for the RV values ​​corresponding to the t-th DMRS port set in the 2nd, ..., Mth transmissions. The list (0,2,3,1) restarts from the beginning when it reaches the end.

[0117] In some embodiments, the terminal device determines the RV value corresponding to each DMRS port set to which the DMRS port belongs in each downlink data transmission based on the RV indication information in the DCI. In specific implementation, the terminal device determines the RV value corresponding to each DMRS port set in each downlink data transmission based on the correspondence between the order of the downlink data transmission, the DMRS port sets, and the RV values; for example, based on a specific sequence of RV values, the DMRS port sets in a transmission correspond to adjacent RV values ​​in the RV value sequence, wherein adjacent positions include cyclically adjacent positions. For example, if the RV value sequence is RV1, RV2, RV3…RVn, during the first downlink data transmission, the RV value corresponding to DMRS port set 0 is RV1, and the RV value corresponding to DMRS port set 1 is RV2; during the second downlink data transmission, the RV value corresponding to DMRS port set 0 is RV3, and the RV value corresponding to DMRS port set 1 is RV4; and so on. When n is even, during the (n / 2+1)th downlink data transmission, the RV value corresponding to DMRS port set 0 is RV1, and the RV value corresponding to DMRS port set 1 is RV2; when n is odd, during the ((n-1) / 2+1)th downlink data transmission, the RV value corresponding to DMRS port set 0 is RVn, and the RV value corresponding to DMRS port set 1 is RV1. In this way, diversity gains on multiple TRPs can be obtained to a limited extent, and combined with the performance of different RVs, the processing performance of downlink data transmission can be improved. For example, the terminal device determines the RV corresponding to each DMRS port set for each time-domain transmission according to the order of the T DMRS port sets corresponding to the first downlink data transmission, the T DMRS port sets corresponding to the second downlink data transmission, and so on, up to the T DMRS port sets corresponding to the Mth transmission. In specific implementation, the terminal device selects one of the Z correspondences based on the redundancy version indication information in the DCI indication to determine the RV value corresponding to the t-th (t=0,1,…,T-1) DMRS port for the nth (n=1,…,M)th transmission in the time domain. The Z correspondences can be the correspondences between the RV values ​​and the T DMRS port sets and the Mth transmissions as specified in the protocol. As shown in Table 3, taking T=2 and Z=4 as an example, each row in Table 3 represents the correspondence between the RV value and the T DMRS port sets. The redundancy version indication information in the DCI indication can determine which row's correspondence to use to determine the RV value corresponding to the t-th DMRS port. Among them, X0, X1, X2, X3 and the redundant version indicator information in DCI can be arbitrarily combined with the values ​​0, 1, 2, 3. A typical combination is X0 = 0, X1 = 1, X2 = 2, X3 = 3. The value options for 'a' are 0, +1, -1; the value options for 'b' are 0, +1, -1.

[0118]

[0119] Table 3

[0120] A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 5 ,like Figure 15 As shown, based on the first row of the DCI redundant version indication information indication table 5, when M=2, a=0, b=-1, the RV values ​​corresponding to different DMRS port sets for each downlink data transmission are as follows: During the first downlink data transmission, the RV value corresponding to DMRS port set 1 is 2, and the RV value corresponding to DMRS port set 0 is 0; During the second downlink data transmission, the RV value corresponding to DMRS port set 1 is 1, and the RV value corresponding to DMRS port set 0 is 3.

[0121] In some embodiments, the terminal device determines the RV value corresponding to each DMRS port set in each downlink data transmission based on the correspondence between each DMRS port set and the RV values ​​in the M downlink data transmissions. In specific implementations, the terminal device determines the RV value corresponding to each DMRS port set in each time-domain transmission according to the order of the M downlink data transmissions corresponding to the first DMRS port set, the M downlink data transmissions corresponding to the second DMRS port set, and so on, up to the M time-domain transmissions corresponding to the Tth DMRS port set. For example, based on a specific sequence of RV values, multiple transmissions of the same DMRS port set correspond to adjacent RV values ​​in the RV value sequence, where adjacent positions include cyclically adjacent positions. For example, if the RV value sequence is RV1, RV2, RV3…RVn, for DMRS port set 0, in the first downlink data transmission, the RV value corresponding to DMRS port set 0 is RV1; in the second downlink data transmission, the RV value corresponding to DMRS port set 0 is RV2, and so on, in the nth downlink data transmission, the RV value corresponding to DMRS port set 0 is RVn; in the (n+1)th downlink data transmission, the RV value corresponding to DMRS port set 0 is RV1. In this way, the performance of time repetition and different RVs can be combined to improve the processing performance of downlink data transmission. For example, the terminal device selects one of the above Z correspondences based on the redundancy version indication information in the DCI indication to determine the RV value corresponding to the t-th DMRS port in the nth transmission in the time domain. The Z correspondences can be the correspondence between the RV value specified by the protocol and the set of T DMRS ports and the number of M transmissions. As shown in Table 4, taking T=2 and Z=4 as an example, each row in Table 4 represents the correspondence between the RV value and the set of T DMRS ports. The redundancy version indication information in the DCI indication can determine which row's correspondence is used to determine the RV value corresponding to the t-th DMRS port. X0, X1, X2, X3 and the redundancy version indication information values ​​0, 1, 2, 3 in the DCI can be arbitrarily combined. A typical combination is X0=0, X1=1, X2=2, X3=3. The value of b can be 0, +1, or -1.

[0122]

[0123] Table 4

[0124] A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 6 ,like Figure 16As shown, based on the correspondence in the third row of the DCI redundancy version indication information table 4, when M=2 and b=0, the RV values ​​corresponding to different DMRS port sets for each downlink data transmission are as follows: In the first downlink data transmission, the RV value corresponding to DMRS port set 0 is 1, and the RV value corresponding to DMRS port set 1 is 2; In the second downlink data transmission, the RV value corresponding to DMRS port set 0 is 0, and the RV value corresponding to DMRS port set 1 is 3.

[0125] In other embodiments, the terminal device determines the RV value corresponding to the first DMRS port set to which the DMRS port belongs in a downlink data transmission based on the RV indication information in the DCI; based on the RV value corresponding to the first DMRS port set, it determines the RV value corresponding to other DMRS port sets to which the DMRS port belongs in the downlink data transmission, excluding the first DMRS port set, according to a fifth preset strategy. The fifth preset strategy includes at least one of the following: the RV value corresponding to the other DMRS port sets is a plurality of values ​​obtained by summing the RV value corresponding to the first DMRS port set in a third-value order and then taking the modulo; and a correspondence between the RV value and the order of the DMRS port sets. In specific implementation, when the fifth preset strategy is that the RV value corresponding to the other DMRS port sets is a plurality of values ​​obtained by summing the RV value corresponding to the first DMRS port set in a third-value order and then taking the modulo, the terminal device selects one of the above Z correspondences to determine the RV value rv_n used in the nth transmission according to the redundancy version indication information in the DCI indication; wherein the Z correspondences can be a correspondence between the RV value and M downlink data transmissions specified by the protocol. Then, the terminal device determines the RV value corresponding to different DMRS port sets in the nth downlink data transmission based on the RV value rv_n used in the nth downlink data transmission. Specifically, the terminal device maps the RV value rv_n used in the nth downlink data transmission to DMRS port set 0, and then selects the Δth value after rv_n according to a specified list (e.g., 0, 2, 3, 1) and uses it sequentially for DMRS port sets 1, ..., DMRS port set T. The list (0, 2, 3, 1) restarts from the beginning when it reaches the end. As shown in Table 5, each row in Table 5 identifies the correspondence between the RV value and the M downlink data transmissions. The redundancy version indication information in the DCI indicates which row's correspondence is used to determine the RV value used in the nth transmission. Among them, X0, X1, X2, X3 and the redundancy version indication information values ​​0, 1, 2, 3 in the DCI can be arbitrarily combined. A typical combination is X0 = 0, X1 = 1, X2 = 2, X3 = 3.

[0126]

[0127] Table 5

[0128] A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 7 ,like Figure 17 As shown, Δ = 1 is taken, meaning the first value after the RV value is used for the next DMRS port set; the terminal device determines that in the first downlink data transmission, the RV value corresponding to DMRS port set 0 is 2, and the RV value corresponding to DMRS port set 1 is 3; in the second downlink data transmission, the RV value corresponding to DMRS port set 0 is 3, and the RV value corresponding to DMRS port set 1 is 2; in the third downlink data transmission, the RV value corresponding to DMRS port set 0 is 1, and the RV value corresponding to DMRS port set 1 is 1; in the fourth downlink data transmission, the RV value corresponding to DMRS port set 0 is 0, and the RV value corresponding to DMRS port set 1 is 0.

[0129] In another optional embodiment, the terminal device obtains multiple RV information based on the RV indication information in the DCI according to a sixth preset strategy. The terminal device selects one of the above Z correspondence relationships for each RV information to determine the RV value corresponding to a DMRS port set to which the DMRS port belongs in the downlink data transmission. The DMRS port is indicated by the antenna port indication information in the DCI. The Z correspondence relationships can be the correspondence between the RV value and M downlink data transmissions as specified in the protocol. The sixth preset strategy includes: the values ​​of the multiple RV indication information are multiple values ​​obtained by summing the values ​​of the RV indication information in the DCI in fourth order and then taking the modulo. In specific implementation, the terminal device determines the RV information corresponding to each DMRS port set according to the sixth preset strategy based on the redundant version indication information indicated in the DCI, and determines the RV value corresponding to each DMRS port set in each downlink data transmission based on the RV information. Thus, since the rule for determining the RV value is simple, it facilitates downlink data transmission processing by the terminal device. In specific implementation, firstly, the terminal device obtains more version indication information I1, ..., I0 according to the sixth preset strategy, based on the redundant version indication information value I0 in the DCI indication. T-1 Among them, I t =Δ*t+I0 (Δ is a positive integer); finally, adjust I... t The value is then modulo-processed. Here, Δ can be understood as an equal-interval increment. Then, the terminal device calculates the value based on I. t Choose one of the above Z correspondences to determine the RV value corresponding to the t-th (t=0,1,…,T-1) DMRS port during the n-th (n=1,…,M) transmission in the time domain. The Z correspondences can be the correspondence between the RV value specified in the protocol and the M downlink data transmissions.

[0130] As shown in Table 6, each row in Table 6 represents the correspondence between the RV value and the M downlink data transmissions. The redundancy version indication information in the DCI indicates which row's correspondence should be used to determine the RV value used in the nth downlink data transmission. X0, X1, X2, X3 can be arbitrarily combined with the redundancy version indication information values ​​0, 1, 2, 3 in the DCI. A typical combination is X0 = 0, X1 = 1, X2 = 2, X3 = 3.

[0131] A schematic diagram illustrating the relationship between the DMRS port set and the RV value provided in this embodiment of the invention. Figure 8 ,like Figure 18 As shown, taking Δ = 2, the terminal device determines that in the first downlink data transmission, the RV value corresponding to DMRS port set 0 is 2, and the RV value corresponding to DMRS port set 1 is 1; in the second downlink data transmission, the RV value corresponding to DMRS port set 0 is 3, and the RV value corresponding to DMRS port set 1 is 0; in the third downlink data transmission, the RV value corresponding to DMRS port set 0 is 1, and the RV value corresponding to DMRS port set 1 is 2; in the fourth downlink data transmission, the RV value corresponding to DMRS port set 0 is 0, and the RV value corresponding to DMRS port set 1 is 3.

[0132] In some embodiments, the method further includes:

[0133] Step S203: The terminal device receives downlink data based on the TCI state and the RV value.

[0134] It should be noted that the execution order of the above steps S201 and S202 is not specifically limited; that is, S202 can be executed before S201, or the two steps can be executed in parallel.

[0135] It should be noted that, in this embodiment of the invention, the downlink data transmission is any one of the following three types, or a combination of any two of them:

[0136] 1. The downlink data transmission corresponds to PDSCH in multiple time slots, or multiple consecutive PDSCH transmission opportunities.

[0137] 2. The downlink data transmission corresponds to multiple transmissions occupying different symbols in a single time slot.

[0138] 3. The downlink data transmission is a series of downlink data transmissions that are transmitted simultaneously, and different downlink data transmissions correspond to different TCI states.

[0139] When the downlink data is transmitted in multiple ways, the multiple downlink data are transmitted as completely identical channel-coded bit data; or, when the downlink data is transmitted in multiple ways, the multiple downlink data are transmitted as the same data or different bit data extracted from the same transport block (TB) after channel coding.

[0140] When multiple downlink data transmissions are transmitted, the multiple downlink data transmissions correspond to the same Hybrid Automatic Repeat reQuest (HARQ) process.

[0141] To implement the aforementioned downlink data transmission method, this embodiment of the invention also provides a terminal device, the composition of which is as follows: Figure 19 As shown, the terminal device 300 includes:

[0142] The processing unit 301 is configured to determine the TCI state corresponding to the downlink data transmission based on the DCI; and to determine the redundancy version RV value corresponding to the downlink data transmission based on the DCI; the TCI state and the RV value are used by the terminal device 300 to receive downlink data.

[0143] In this embodiment of the invention, the processing unit 301 is configured to determine the TCI state corresponding to downlink data transmission based on the antenna port indication information and TCI state indication information in the DCI.

[0144] In this embodiment of the invention, the processing unit 301 is configured to determine K TCI states (K > 1) based on the TCI state indication information in the DCI; and to determine the TCI state corresponding to each DMRS port in each downlink data transmission in the time domain from the K TCI states according to the DMRS port set to which the DMRS port belongs. The DMRS port is indicated by the antenna port indication information in the DCI. The DMRS port set to which the DMRS port belongs is determined based on the DMRS CDM group corresponding to the DMRS port indicated by the port indication information in the DCI, and the correspondence between the DMRS CDM group and the DMRS port set. The correspondence between the DMRS CDM group and the DMRS port set is preset by the terminal device or sent to the terminal device by the network device through configuration signaling.

[0145] In this embodiment of the invention, the processing unit 301 is configured to determine the DMRS port set to which the DMRS port belongs based on the first indication information sent by the network device.

[0146] In this embodiment of the invention, the processing unit 301 is configured to determine that all DMRS ports belong to a DMRS port set when the value corresponding to the first indication information is a first value.

[0147] In this embodiment of the invention, the processing unit 301 is configured such that when the value corresponding to the first indication information is the second value, it determines the DMRS port set to which the DMRS port indicated by the port indication information in the DCI belongs based on a pre-set correspondence between DMRS ports and DMRS port sets.

[0148] In this embodiment of the invention, the first indication information indicates the DMRS ports included in each DMRS port set.

[0149] In this embodiment of the invention, the processing unit 301 is configured such that, when the first indication information is configured, the terminal device determines the DMRS port set to which the DMRS port belongs based on the DMRS CDM group corresponding to the DMRS port indicated by the port indication information in the DCI, and the correspondence between the DMRS CDM group and the DMRS port set. The correspondence between the DMRS CDM group and the DMRS port set is preset by the terminal device or sent to the terminal device by the network device via configuration signaling.

[0150] In this embodiment of the invention, the processing unit 301 is configured to determine the DMRS port set to which the DMRS port belongs based on a first preset strategy when the first indication information is configured.

[0151] In this embodiment of the invention, the processing unit 301 is configured to determine the DMRS port set to which the DMRS port belongs based on a first preset strategy.

[0152] In this embodiment of the invention, the processing unit 301 is further configured to determine the number of times the downlink data is transmitted in the time domain based on second indication information sent by the network device. The second indication information is the PDSCH-AggregationFactor.

[0153] In this embodiment of the invention, the processing unit 301 is configured to determine the different TCI states corresponding to the DMRS ports belonging to different DMRS port sets; and the TCI state corresponding to each DMRS port remains constant during each transmission of downlink data in the time domain.

[0154] In this embodiment of the invention, the processing unit 301 is configured to determine the TCI state corresponding to each DMRS port in the downlink data transmission according to a second preset strategy based on the TCI state corresponding to the previous downlink data transmission. The second preset strategy includes at least one of the following: TCI state offset, TCI state cycling, and TCI state swapping.

[0155] In this embodiment of the invention, when the number of DMRS port sets is 1, the processing unit 301 determines the TCI state corresponding to the DMRS port in each downlink data transmission in the time domain according to a third preset strategy. The third preset strategy includes at least one of the following:

[0156] Each downlink data transmission uses one of the K TCI states in sequence. After all K TCI states have been used, the downlink data transmission repeats the order in which the K TCI states were used.

[0157] Select the same number of TCI states from the K TCI states as the number of times the downlink data is transmitted in the time domain, and use one TCI state for each downlink data transmission sequence.

[0158] In this embodiment of the invention, the processing unit 301 is configured to determine the RV value corresponding to downlink data transmission based on the antenna port indication information and / or RV indication information in the DCI.

[0159] In this embodiment of the invention, the processing unit 301 is configured to determine the RV value corresponding to each downlink data transmission based on the correspondence between the RV value in the RV indication information in the DCI and the number of downlink data transmissions;

[0160] In each downlink data transmission in the time domain, the DMRS port corresponds to the same RV value, and the DMRS port is indicated by the antenna port indication information in the DCI.

[0161] In this embodiment of the invention, the processing unit 301 is configured to select the RV value corresponding to each DMRS port set to which the DMRS port belongs, based on the RV indication information in the DCI.

[0162] In each downlink data transmission in the time domain, the RV value corresponding to the DMRS port set to which the DMRS port belongs remains constant, and the DMRS port is indicated by the antenna port indication information in the DCI.

[0163] In this embodiment of the invention, the processing unit 301 is configured to select, based on the RV indication information in the DCI, the RV value corresponding to each DMRS port set to which the DMRS port belongs in the previous downlink data transmission in the time domain, wherein the DMRS port is indicated by the antenna port indication information in the DCI;

[0164] Based on the RV value corresponding to each DMRS port set in the first downlink data transmission, the RV value corresponding to each DMRS port set to which the DMRS port belongs in the subsequent one or more downlink data transmissions is determined according to a fourth preset strategy. The fourth preset strategy includes at least one of the following: RV value offset, position offset in the RV value sequence, and RV value swapping.

[0165] In this embodiment of the invention, the processing unit 301 is configured to determine, based on the RV indication information in the DCI, the RV value corresponding to each DMRS port set to which the DMRS port belongs in each downlink data transmission, wherein the DMRS port is indicated by the antenna port indication information in the DCI.

[0166] In this embodiment of the invention, the processing unit 301 is configured to determine the RV value corresponding to each DMRS port set in each downlink data transmission based on the correspondence between the order of the downlink data transmission and the DMRS port set and the RV value.

[0167] In this embodiment of the invention, the processing unit 301 is configured to be based on a specific order of RV value sequence, where multiple downlink data transmissions of the same DMRS port set correspond to adjacent RV values ​​in the RV value sequence, wherein adjacent positions include cyclically adjacent positions.

[0168] In this embodiment of the invention, the processing unit 301 is configured to determine the RV value corresponding to each DMRS port set in each downlink data transmission based on the correspondence between each DMRS port set and the RV value in M ​​downlink data transmissions, wherein M is greater than or equal to 1.

[0169] In this embodiment of the invention, the processing unit 301 is configured to be based on a sequence of RV values ​​in a specific order, wherein the set of DMRS ports in a single transmission corresponds to adjacent RV values ​​in the sequence of RV values, and adjacent positions include cyclically adjacent positions.

[0170] In this embodiment of the invention, the processing unit 301 is configured to determine the RV value corresponding to the first DMRS port set to which the DMRS port belongs in a downlink data transmission based on the RV indication information in the DCI.

[0171] Based on the RV value corresponding to the first DMRS port set, the RV value corresponding to other DMRS port sets (excluding the first DMRS port set) to which the DMRS port belongs in the downlink data transmission is determined according to the fifth preset strategy. The DMRS port is indicated by the antenna port indication information in the DCI. The fifth preset strategy includes at least one of the following:

[0172] The RV values ​​corresponding to the other DMRS port sets are multiple values ​​obtained by summing the RV values ​​corresponding to the first DMRS port set in the order of the third value and taking the modulo; and the correspondence between the RV values ​​and the order of the DMRS port sets.

[0173] In this embodiment of the invention, the processing unit 301 is configured to acquire multiple RV information based on the RV indication information in the DCI according to a sixth preset strategy. Each RV information is used to indicate the RV value corresponding to a DMRS port set to which the DMRS port belongs in downlink data transmission. The DMRS port is indicated by the antenna port indication information in the DCI. The sixth preset strategy includes: the values ​​of the multiple RV indication information are multiple values ​​obtained by summing the values ​​of the RV indication information in the DCI in a fourth-value order and then taking the modulus.

[0174] In this embodiment of the invention, the downlink data transmission is any one of the following three types, or any combination of two of them:

[0175] 1. The downlink data transmission corresponds to PDSCH in multiple time slots, or multiple consecutive PDSCH transmission opportunities.

[0176] 2. The downlink data transmission corresponds to multiple transmissions occupying different symbols in a single time slot.

[0177] 3. The downlink data transmission is a series of downlink data transmissions that are transmitted simultaneously, and different downlink data transmissions correspond to different TCI states.

[0178] When the downlink data is transmitted in multiple ways, the multiple downlink data are transmitted as completely identical channel-coded bit data; or, when the downlink data is transmitted in multiple ways, the multiple downlink data are transmitted as the same data or different bit data extracted from the same TB after channel coding.

[0179] When multiple downlink data transmissions are performed, the multiple downlink data transmissions correspond to the same HARQ process.

[0180] In this embodiment of the invention, the terminal device 300 further includes a transceiver unit 302, configured to receive downlink data based on the TCI state and the RV value.

[0181] The invention also provides a terminal device, including a processor and a memory for storing a computer program that can run on the processor, wherein when the processor runs the computer program, it executes the steps of the downlink data transmission method executed by the terminal device described above.

[0182] Figure 20 This is a schematic diagram of the hardware composition of a terminal device according to an embodiment of the present invention. The terminal device 700 includes at least one processor 701, a memory 702, and at least one network interface 704. The various components in the terminal device 700 are coupled together through a bus system 705. It is understood that the bus system 705 is used to implement communication between these components. In addition to a data bus, the bus system 705 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in… Figure 20 The general labeled all buses as Bus System 705.

[0183] It is understood that memory 702 can be volatile memory or non-volatile memory, or both. Non-volatile memory can be ROM, programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), magnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); magnetic surface memory can be disk storage or magnetic tape storage. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM). The memory 702 described in this embodiment is intended to include, but is not limited to, these and any other suitable types of memory.

[0184] In this embodiment of the invention, the memory 702 is used to store various types of data to support the operation of the terminal device 700. Examples of such data include any computer program, such as application program 7022, for operation on the terminal device 700. A program implementing the method of this embodiment of the invention may be included in application program 7022.

[0185] The methods disclosed in the above embodiments of the present invention can be applied to processor 701, or implemented by processor 701. Processor 701 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 701 or by instructions in software form. The processor 701 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 701 can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of the present invention can be directly manifested as being executed by a hardware decoding processor, or being executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in a storage medium, which is located in memory 702. Processor 701 reads the information in memory 702 and combines its hardware to complete the steps of the aforementioned method.

[0186] In an exemplary embodiment, the terminal device 700 may be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), FPGAs, general-purpose processors, controllers, MCUs, MPUs, or other electronic components to perform the aforementioned method.

[0187] This application also provides a computer-readable storage medium for storing computer programs.

[0188] Optionally, the computer-readable storage medium can be applied to the terminal device in the embodiments of this application, and the computer program causes the computer to execute the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0189] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0190] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0191] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0192] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A downlink data transmission method, applied to the transmission of M physical downlink shared channels (PDSCH) carrying the same data, wherein M is greater than or equal to 2, the method comprising: The terminal device determines the Transmission Configuration Indicator (TCI) status corresponding to the PDSCH transmission based on the Downlink Control Information (DCI). as well as The redundancy version RV value corresponding to the PDSCH transmission is determined based on the DCI. The TCI state and the RV value are used by the terminal device to transmit and receive downlink data through the M PDSCHs. The terminal device determines the TCI status corresponding to the PDSCH transmission based on DCI, including: The terminal device determines K TCI states based on the TCI state indication information in the DCI, where K is greater than 1; and Based on the Code Division Multiplexing (CDM) group to which the DMRS port belongs, the TCI state corresponding to each DMRS port in each PDSCH transmission in the time domain is determined from the K TCI states, wherein the DMRS port is indicated by the antenna port indication information in the DCI. Specifically, based on the CDM group to which the DMRS port belongs, the TCI state corresponding to each DMRS port in each PDSCH transmission in the time domain is determined from the K TCI states, including: When the number of CDM groups is 1, the TCI state corresponding to the DMRS port in each PDSCH transmission in the time domain is determined according to the third preset strategy. The third preset strategy includes at least one of the following: If M is greater than or equal to K, starting from the first TCI state among the K TCI states, each PDSCH transmission uses each TCI state among the K TCI states in sequence, and after all the K TCI states have been used up, starting from the first TCI state, the PDSCH transmission reuses the K TCI states in sequence. If M is less than K, select several TCI states from the K TCI states, wherein the number of selected TCI states is the same as the number of times the downlink data is transmitted in the time domain, and the selected TCI states are used in the transmission order of each PDSCH.

2. The method according to claim 1, wherein, Determining the redundancy version RV value corresponding to the PDSCH transmission based on the DCI includes: Based on the correspondence between the RV value in the RV indication information in the DCI and the number of PDSCH transmissions, the RV value corresponding to each PDSCH transmission is determined.

3. The method according to claim 2, wherein, Determining the redundancy version RV value corresponding to the PDSCH transmission based on the DCI also includes: In each downlink data transmission in the time domain, the DMRS port corresponds to the same RV value.

4. The method according to any one of claims 1 to 3, wherein, K＝2。 5. The method according to any one of claims 1 to 3, wherein, M = 2 or M = 4.

6. The method according to any one of claims 1 to 3, wherein, The method further includes: The terminal device determines the number of times the downlink data is transmitted in the time domain based on the second indication information sent by the network device.

7. The method according to any one of claims 1 to 3, wherein, The M PDSCH transmissions correspond to PDSCHs in multiple time slots, or multiple consecutive PDSCH transmission opportunities.

8. The method according to any one of claims 1 to 3, wherein, The M PDSCH transmissions correspond to multiple transmissions occupying different symbols in a single time slot.

9. The method according to any one of claims 1 to 3, wherein, The M PDSCH transmissions are either the same data or different bits extracted from the same transport block TB after channel coding.

10. The method according to any one of claims 1 to 3, wherein, The M PDSCH transmissions correspond to the same Hybrid Automatic Repeat Request (HARQ) process.

11. The method according to any one of claims 1 to 3, wherein, The method further includes: The terminal device receives downlink data based on the TCI status and the RV value.

12. A terminal device for transmitting M Physical Downlink Shared Channels (PDSCHs) carrying the same data, wherein M is greater than or equal to 2, the terminal device comprising: The processing unit is configured to determine the Transmission Configuration Indicator (TCI) status corresponding to the PDSCH transmission based on the downlink control information (DCI). And based on the DCI, the redundant version RV value corresponding to the PDSCH transmission is further determined; The TCI status and the RV value are used by the terminal device to transmit and receive downlink data through the M PDSCHs. The processing unit is further configured as follows: Based on the TCI state indication information in the DCI, K TCI states are determined, where K is greater than 1; and Based on the Code Division Multiplexing (CDM) group to which the DMRS port belongs, the TCI state corresponding to each DMRS port in each PDSCH transmission in the time domain is determined from the K TCI states, wherein the DMRS port is indicated by the antenna port indication information in the DCI. The processing unit is further configured as follows: When the number of CDM groups is 1, the TCI state corresponding to the DMRS port in each PDSCH transmission in the time domain is determined according to the third preset strategy. The third preset strategy includes at least one of the following: If M is greater than or equal to K, starting from the first TCI state among the K TCI states, each PDSCH transmission uses each TCI state among the K TCI states in sequence, and after all the K TCI states have been used up, starting from the first TCI state, the PDSCH transmission reuses the K TCI states in sequence. If M is less than K, select several TCI states from the K TCI states, wherein the number of selected TCI states is the same as the number of times the downlink data is transmitted in the time domain, and the selected TCI states are used in the transmission order of each PDSCH.

13. The terminal device according to claim 12, wherein, The processing unit is further configured to: Based on the correspondence between the RV value in the RV indication information in the DCI and the number of PDSCH transmissions, the RV value corresponding to each PDSCH transmission is determined.

14. The terminal device according to claim 13, wherein, The processing unit is further configured to: In each downlink data transmission in the time domain, the DMRS port corresponds to the same RV value.

15. The terminal device according to any one of claims 12 to 14, wherein, K＝2。 16. The terminal device according to any one of claims 12 to 14, wherein, M = 2 or M = 4.

17. The terminal device according to any one of claims 12 to 14, wherein, The processing unit is further configured to: The number of times the downlink data is transmitted in the time domain is determined based on the second indication information sent by the network device.

18. The terminal device according to any one of claims 12 to 14, wherein, The M PDSCH transmissions correspond to PDSCHs in multiple time slots, or multiple consecutive PDSCH transmission opportunities.

19. The terminal device according to any one of claims 12 to 14, wherein, The M PDSCH transmissions correspond to multiple transmissions occupying different symbols in a single time slot.

20. The terminal device according to any one of claims 12 to 14, wherein, The M PDSCH transmissions are either the same data or different bits extracted from the same transport block TB after channel coding.

21. The terminal device according to any one of claims 12 to 14, wherein, The M PDSCH transmissions correspond to the same Hybrid Automatic Repeat Request (HARQ) process.

22. The terminal device according to any one of claims 12 to 14, wherein, The terminal device also includes: The transceiver unit is configured to receive downlink data based on the TCI state and the RV value.

23. A terminal device for transmitting M Physical Downlink Shared Channels (PDSCHs) carrying the same data, wherein M is greater than or equal to 2, the terminal device comprising: processor; as well as Memory, used to store computer programs. The processor is configured to invoke and execute a computer program stored in the memory for performing the downlink data transmission method according to any one of claims 1 to 11.

24. A downlink data transmission method applied to the transmission of M physical downlink shared channels (PDSCH) carrying the same data, wherein M is greater than or equal to 2, the method comprising: The network device sends downlink control information (DCI) to the terminal device. The downlink control information (DCI) is used by the terminal device to: determine the transmission configuration indication (TCI) status corresponding to the PDSCH transmission, and further determine the redundancy version (RV) value corresponding to the PDSCH transmission. as well as Based on the TCI status and the RV value, downlink data is transmitted to the terminal device via the M PDSCH transmissions. The DCI is used by the terminal device to determine the TCI state corresponding to the PDSCH transmission through the following process: Based on the TCI state indication information in the DCI, K TCI states are determined, where K is greater than 1; and Based on the Code Division Multiplexing (CDM) group to which the DMRS port belongs, the TCI state corresponding to each DMRS port in each PDSCH transmission in the time domain is determined from the K TCI states, wherein the DMRS port is indicated by the antenna port indication information in the DCI. Specifically, based on the CDM group to which the DMRS port belongs, the TCI state corresponding to each DMRS port in each PDSCH transmission in the time domain is determined from the K TCI states, including: When the number of CDM groups is 1, the TCI state corresponding to the DMRS port in each PDSCH transmission in the time domain is determined according to the third preset strategy. The third preset strategy includes at least one of the following: If M is greater than or equal to K, starting from the first TCI state among the K TCI states, each PDSCH transmission uses each TCI state among the K TCI states in sequence, and after all the K TCI states have been used up, starting from the first TCI state, the PDSCH transmission reuses the K TCI states in sequence. If M is less than K, select several TCI states from the K TCI states, wherein the number of selected TCI states is the same as the number of times the downlink data is transmitted in the time domain, and the selected TCI states are used in the transmission order of each PDSCH.

25. The method according to claim 24, wherein, Determine the redundancy version RV value corresponding to the PDSCH transmission, including: Based on the correspondence between the RV value in the RV indication information in the DCI and the number of PDSCH transmissions, the RV value corresponding to each PDSCH transmission is determined.

26. The method of claim 25, wherein, Determining the redundancy version RV value corresponding to the PDSCH transmission also includes: In each downlink data transmission in the time domain, the DMRS port corresponds to the same RV value.

27. The method according to any one of claims 24 to 26, wherein, K＝2。 28. The method according to any one of claims 24 to 26, wherein, M = 2 or M = 4.

29. The method according to any one of claims 24 to 26, wherein, The method further includes: The network device sends a second indication information to the terminal device, the second indication information being used by the terminal device to determine the number of times the downlink data is transmitted in the time domain.

30. The method according to any one of claims 24 to 26, wherein, The M PDSCH transmissions correspond to PDSCHs in multiple time slots, or multiple consecutive PDSCH transmission opportunities.

31. The method according to any one of claims 24 to 26, wherein, The M PDSCH transmissions correspond to multiple transmissions occupying different symbols in a single time slot.

32. The method according to any one of claims 24 to 26, wherein, The M PDSCH transmissions are either the same data or different bits extracted from the same transport block TB after channel coding.

33. The method according to any one of claims 24 to 26, wherein, The M PDSCH transmissions correspond to the same Hybrid Automatic Repeat Request (HARQ) process.

34. The method according to any one of claims 24 to 26, wherein, The method further includes: The network device sends downlink data to the terminal device based on the TCI status and the RV value.

35. A network device for transmitting M Physical Downlink Shared Channels (PDSCHs) carrying the same data, wherein M is greater than or equal to 2, the network device comprising: processor; as well as Memory, used to store computer programs. The computer program, when executed by the processor, causes the network device to: Send downlink control information (DCI) to the terminal device. The downlink control information (DCI) is used by the terminal device to: determine the transmission configuration indication (TCI) status corresponding to the PDSCH transmission, and further determine the redundancy version (RV) value corresponding to the PDSCH transmission. as well as Based on the TCI status and the RV value, downlink data is transmitted to the terminal device via the M PDSCH transmissions. The DCI is used by the terminal device to determine the TCI state corresponding to the PDSCH transmission through the following process: Based on the TCI state indication information in the DCI, K TCI states are determined, where K is greater than 1; and Based on the Code Division Multiplexing (CDM) group to which the DMRS port belongs, the TCI state corresponding to each DMRS port in each PDSCH transmission in the time domain is determined from the K TCI states, wherein the DMRS port is indicated by the antenna port indication information in the DCI. Specifically, based on the CDM group to which the DMRS port belongs, the TCI state corresponding to each DMRS port in each PDSCH transmission in the time domain is determined from the K TCI states, including: When the number of CDM groups is 1, the TCI state corresponding to the DMRS port in each PDSCH transmission in the time domain is determined according to the third preset strategy. The third preset strategy includes at least one of the following: If M is greater than or equal to K, starting from the first TCI state among the K TCI states, each PDSCH transmission uses each TCI state among the K TCI states in sequence, and after all the K TCI states have been used up, starting from the first TCI state, the PDSCH transmission reuses the K TCI states in sequence. If M is less than K, select several TCI states from the K TCI states, wherein the number of selected TCI states is the same as the number of times the downlink data is transmitted in the time domain, and the selected TCI states are used in the transmission order of each PDSCH.

36. The network device according to claim 35, wherein, Determine the redundancy version RV value corresponding to the PDSCH transmission, including: Based on the correspondence between the RV value in the RV indication information in the DCI and the number of PDSCH transmissions, the RV value corresponding to each PDSCH transmission is determined.

37. The network device according to claim 36, wherein, Determining the redundancy version RV value corresponding to the PDSCH transmission also includes: In each downlink data transmission in the time domain, the DMRS port corresponds to the same RV value.

38. The network device according to any one of claims 35 to 37, wherein, K＝2。 39. The network device according to any one of claims 35 to 37, wherein, M = 2 or M = 4.

40. The network device according to any one of claims 35 to 37, wherein, The computer program, when executed by the processor, also causes the network device to: Send a second indication message to the terminal device, the second indication message being used by the terminal device to determine the number of times the downlink data is transmitted in the time domain.

41. The network device according to any one of claims 35 to 37, wherein, The M PDSCH transmissions correspond to PDSCHs in multiple time slots, or multiple consecutive PDSCH transmission opportunities.

42. The network device according to any one of claims 35 to 37, wherein, The M PDSCH transmissions correspond to multiple transmissions occupying different symbols in a single time slot.

43. The network device according to any one of claims 35 to 37, wherein, The M PDSCH transmissions are either the same data or different bits extracted from the same transport block TB after channel coding.

44. The network device according to any one of claims 35 to 37, wherein, The M PDSCH transmissions correspond to the same Hybrid Automatic Repeat Request (HARQ) process.

45. The network device according to any one of claims 35 to 37, wherein, The computer program, when executed by the processor, also causes the network device to: The downlink data is sent to the terminal device based on the TCI status and the RV value.

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