A method and apparatus for indicating transmission configuration status.

Abstract

This disclosure provides a method for indicating the state of a Transmission Configuration Indicator (TCI), applicable to the field of communication technology. The method, executed by a terminal device, includes receiving first indication information sent by a network device. The first indication information indicates at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission. This allows the terminal device to accurately determine which first reference signal is quasi-co-addressed with each DMRS port in the joint transmission, thereby reliably realizing multi-TRP-based joint transmission and improving the transmission performance of multi-TRP-based CJT.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a method and apparatus for indicating transmission configuration indication status. Background Technology

[0002] Current discussions on Multiple-Input Multiple-Output (MIMO) systems focus on achieving coherent joint transmission (CJT) with multiple transmission reception points (TRPs) and ideal backhaul connections. Because the TRPs may be located in different positions, their propagation distances and directions to the terminal device may differ, resulting in varying transmission parameters at the terminal device. Therefore, how to indicate the transmission configuration indication (TCI) state for multi-TRP CJTs is a pressing issue that needs to be addressed. Summary of the Invention

[0003] This disclosure provides a method and apparatus for indicating the transmission configuration indication status.

[0004] In a first aspect, embodiments of this disclosure provide a method for indicating a transmission configuration indication state, the method being executed by a terminal device, the method comprising: receiving first indication information sent by a network device, wherein the first indication information is used to indicate at least one and / or at least one pair of transmission configuration indication (TCI) states for joint transmission.

[0005] In this disclosure, the terminal device can receive at least one and / or at least one pair of TCI states sent by the network device for joint transmission, and then determine a first reference signal quasi-co-addressable with each DMRS port of the joint transmission, thereby reliably realizing joint transmission based on multiple TRP and improving the transmission performance of CJT based on multiple TRP.

[0006] In a second aspect, embodiments of this disclosure provide a method for indicating a transmission configuration indication state, the method being executed by a network device, the method comprising: sending first indication information to a terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of transmission configuration indication (TCI) states for joint transmission.

[0007] In this disclosure, the network device can send at least one and / or at least one pair of TCI states for joint transmission to the terminal device, so that the terminal device can accurately determine which quasi-co-address the first reference signal indicated by each DMRS port in the joint transmission and which pair of TCI states indicates, thereby reliably realizing joint transmission based on multiple TRP and improving the transmission performance of CJT based on multiple TRP.

[0008] Thirdly, embodiments of this disclosure provide a communication device, which is applied to a terminal device, and the device includes:

[0009] The transceiver module is configured to receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0010] Fourthly, embodiments of this disclosure provide a communication device applied to a network device, the device comprising:

[0011] A transceiver module is configured to send first indication information to a terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0012] Fifthly, embodiments of this disclosure provide a communication device including a processor and a memory, the memory storing a computer program; the processor executes the computer program stored in the memory to cause the communication device to perform the method described in the first aspect above.

[0013] In a sixth aspect, embodiments of this disclosure provide a communication device including a processor and a memory, the memory storing a computer program; the processor executes the computer program stored in the memory to cause the communication device to perform the method described in the second aspect above.

[0014] In a seventh aspect, embodiments of this disclosure provide a communication device including a processor and an interface circuit. The interface circuit is configured to receive code instructions and transmit them to the processor, which is configured to execute the code instructions to cause the device to perform the method described in the first aspect above.

[0015] Eighthly, embodiments of this disclosure provide a communication device including a processor and an interface circuit. The interface circuit is configured to receive code instructions and transmit them to the processor, which is configured to execute the code instructions to cause the device to perform the method described in the second aspect above.

[0016] In a ninth aspect, embodiments of this disclosure provide an indication system for transmitting a configuration indication status, the system including the communication device described in the third aspect; or, the system including the communication device described in the fifth aspect and the communication device described in the sixth aspect; or, the system including the communication device described in the seventh aspect and the communication device described in the eighth aspect.

[0017] In a tenth aspect, embodiments of the present invention provide a computer-readable storage medium for storing instructions for use by the aforementioned terminal device, wherein when the instructions are executed, the terminal device performs the method described in the first aspect.

[0018] Eleventhly, embodiments of the present invention provide a computer-readable storage medium for storing instructions for use by the aforementioned terminal device, which, when executed, cause the terminal device to perform the method described in the second aspect above.

[0019] In a twelfth aspect, this disclosure also provides a computer program product including a computer program that, when run on a computer, causes the computer to perform the method described in the first aspect above.

[0020] In a thirteenth aspect, this disclosure also provides a computer program product including a computer program that, when run on a computer, causes the computer to perform the method described in the second aspect above.

[0021] In a fourteenth aspect, this disclosure provides a chip system including at least one processor and an interface for supporting a terminal device in implementing the functions involved in the first aspect, such as determining or processing at least one of the data and information involved in the above methods. In one possible design, the chip system further includes a memory for storing computer programs and data necessary for the terminal device. The chip system may be composed of chips or may include chips and other discrete devices.

[0022] In a fifteenth aspect, this disclosure provides a chip system including at least one processor and an interface for supporting network devices in implementing the functions involved in the first aspect, such as determining or processing at least one of the data and information involved in the above methods. In one possible design, the chip system further includes a memory for storing computer programs and data necessary for the terminal device. The chip system may be composed of chips or may include chips and other discrete devices.

[0023] In a sixteenth aspect, this disclosure provides a computer program that, when run on a computer, causes the computer to perform the method described in the first aspect above.

[0024] In a seventeenth aspect, this disclosure provides a computer program that, when run on a computer, causes the computer to perform the method described in the first aspect above. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments or background art of this disclosure, the accompanying drawings used in the embodiments or background art of this disclosure will be described below.

[0026] Figure 1 This is a schematic diagram of the architecture of a communication system provided in an embodiment of this disclosure;

[0027] Figure 2 This is a flowchart illustrating a method for indicating the transmission configuration indication status provided in an embodiment of this disclosure;

[0028] Figure 3 This is a flowchart illustrating another method for indicating the transmission configuration indication status provided in this embodiment of the present disclosure;

[0029] Figure 4 This is a flowchart illustrating another method for indicating the transmission configuration indication status provided in this embodiment of the present disclosure;

[0030] Figure 5 This is a flowchart illustrating another method for indicating the transmission configuration indication status provided in this embodiment of the present disclosure;

[0031] Figure 6 This is a flowchart illustrating another method for indicating transmission configuration indication status provided in this embodiment of the present disclosure;

[0032] Figure 7 This is a flowchart illustrating another method for indicating transmission configuration indication status provided in this embodiment of the present disclosure;

[0033] Figure 8 This is a flowchart illustrating another method for indicating transmission configuration indication status provided in this embodiment of the present disclosure;

[0034] Figure 9 This is a flowchart illustrating another method for indicating transmission configuration indication status provided in this embodiment of the present disclosure;

[0035] Figure 10 This is a flowchart illustrating another method for indicating transmission configuration indication status provided in this embodiment of the present disclosure;

[0036] Figure 11 This is a flowchart illustrating another method for indicating transmission configuration indication status provided in this embodiment of the present disclosure;

[0037] Figure 12 This is a flowchart illustrating another method for indicating transmission configuration indication status provided in this embodiment of the present disclosure;

[0038] Figure 13 This is a flowchart illustrating another method for indicating transmission configuration indication status provided in this embodiment of the present disclosure;

[0039] Figure 14 This is a schematic diagram of the structure of a communication device provided in an embodiment of this disclosure;

[0040] Figure 15 This is a schematic diagram of another communication device provided in an embodiment of this disclosure;

[0041] Figure 16 This is a schematic diagram of the structure of a chip provided in an embodiment of this disclosure. Detailed Implementation

[0042] To facilitate understanding, the terminology used in this disclosure will be introduced first.

[0043] 1. Transmission Configuration Indication (TCI)

[0044] This information is used to inform the terminal device which synchronization signal block (SSB) or channel state information reference signal (CSI-RS) transmitted by the network device is co-located with the demodulation reference signal corresponding to the physical downlink control channel (PDCCH) or physical downlink shared channel (PDSCH); or to inform the terminal device which reference signal (e.g., SRS) transmitted by the terminal or which SSB or CSI-RS transmitted by the base station is co-located with the demodulation reference signal corresponding to the physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH). The co-location information includes one of the following transmission parameters: average delay, delay spread, Doppler frequency shift, Doppler spread, and spatial reception parameters.

[0045] 2. Transmitter / Receiver Node (TRP)

[0046] A TRP is equivalent to a traditional base station, but in some cases, a cell may be covered by more than one TRP, but rather by multiple TRPs working together.

[0047] 3. Coherent Joint Transmission (CJT)

[0048] CJT refers to joint transmission through multiple transmission points, such as TRP, to improve the overall signal at the terminal device.

[0049] 4. Downlink control information (DCI)

[0050] Downlink control information sent from network devices to terminal devices, carried by the physical downlink control channel (PDCCH), includes uplink and downlink resource allocation, Hybrid Automatic Repeat reQuest (HARQ) information, power control, etc.

[0051] 5. Reference signal (RS)

[0052] The reference signal, also known as the "pilot signal," is a known signal provided by the transmitter to the receiver for channel estimation or channel sounding. It can be used for coherent detection and demodulation of terminal equipment, beam measurement, channel state information measurement, coherent detection and monitoring of network equipment, or channel quality measurement, etc.

[0053] 6. Quasi-co-location (QCL)

[0054] QCL is a channel state assumption. If a DMRS port of a channel has a QCL relationship with a reference signal, then the transmission parameters of the DMRS port of that channel are the same as the transmission parameters corresponding to the reference signal. The transmission parameters include at least one of the following: average delay, delay spread, Doppler frequency shift, Doppler spread, and spatial reception parameters.

[0055] 7. Demodulation Reference Signal (DMRS)

[0056] When network devices schedule data, such as scheduling Physical Downlink Shared Channel (PDSCH) data, they need to specify the corresponding DMRS ports, including the number of DMRS ports and their DMRS port numbers. Different DMRS port numbers correspond to orthogonal DMRS ports. The number of DMRS ports is equal to the number of transmission layers of the PDSCH data. If different terminal devices occupy the same time-frequency resources to receive PDSCH data, the network device needs to allocate different DMRS port numbers to ensure DMRS orthogonality.

[0057] Currently, the frontend DMRS is divided into two types, and the orthogonal frequency division multiple access (OFDM) symbol length occupied by the frontend DMRS can be 1 or 2, where the frontend DMRS occupies the starting position of the PDSCH. For type 1, when the number of symbols is 2, DMRS ports 0, 1, 4, and 5 are code domain multiplexing (CDM) group 1, and DMRS ports 2, 3, 6, and 7 are CDM group 2. When the number of symbols is 1, DMRS ports 0 and 1 are CDM group 1, and DMRS ports 2 and 3 are CDM group 2. Type 1 DMRS supports a maximum of 8 layers of transmission, for example, terminal device 1 uses 4 layers and terminal device 2 uses 4 layers in a pairing, or terminal devices 1 through 8 each use 1 layer in a pairing. For Type 2, when the number of symbols is 2, DMRS ports 0, 1, 6, and 7 belong to CDM group 1, DMRS ports 2, 3, 8, and 9 belong to CDM group 2, and DMRS ports 4, 5, 10, and 11 belong to CDM group 3. When the number of symbols is 1, DMRS ports 0 and 1 belong to CDM group 1, DMRS ports 2 and 3 belong to CDM group 2, and DMRS ports 4 and 5 belong to CDM group 3. Type 2 DMRS supports a maximum of 12 layers of transmission. Additional DMRS refers to repeating the preceding DMRS on subsequent symbols, with the same CDM group as the preceding DMRS.

[0058] To better understand the method for indicating the transmission configuration indication status disclosed in this disclosure, the communication system to which this disclosure applies will be described first.

[0059] Please see Figure 1 , Figure 1 This is a schematic diagram of the architecture of a communication system provided in an embodiment of this disclosure. The communication system may include, but is not limited to, a network device, such as a TRP, and a terminal device. Figure 1 The number and form of devices shown are for illustrative purposes only and do not constitute a limitation on the embodiments of this disclosure. In actual applications, two or more network devices and two or more terminal devices may be included. Figure 1 The communication system shown is an example comprising two TRPs, TRP11 and TRP12, and a terminal device 13.

[0060] It should be noted that the technical solutions of this disclosure can be applied to various communication systems. For example, Long Term Evolution (LTE) systems, 5th Generation (5G) mobile communication systems, 5G New Radio (NR) systems, or other future new mobile communication systems.

[0061] In this disclosure, TRP11 and TRP12 are network-side entities used for transmitting or receiving signals. For example, they can be evolved NodeBs (eNBs), transmission reception points (TRPs), next-generation NodeBs (gNBs) in NR systems, base stations in other future mobile communication systems, or access nodes in wireless fidelity (WiFi) systems, respectively. This disclosure does not limit the specific technology or device form used in the network equipment. The network equipment provided in this disclosure can be composed of a central unit (CU) and a distributed unit (DU). The CU can also be called a control unit. Using a CU-DU structure allows the protocol layer of a network device, such as a base station, to be separated. Some protocol layer functions are centrally controlled by the CU, while the remaining or all protocol layer functions are distributed in the DU, which is centrally controlled by the CU. In this disclosure, TRPs can also be replaced with remote radio heads or antenna panels, etc.

[0062] In this disclosure, the terminal device 13 is a user-side entity used to receive or transmit signals, such as a mobile phone. The terminal device can also be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal device can be a car with communication capabilities, a smart car, a mobile phone, a wearable device, a tablet computer, a computer with wireless transceiver capabilities, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, a wireless terminal device in a smart home, and so on. This disclosure does not limit the specific technology or device form used in the terminal device.

[0063] It is understood that the communication system described in the embodiments of this disclosure is for the purpose of more clearly illustrating the technical solutions of the embodiments of this disclosure, and does not constitute a limitation on the technical solutions provided in the embodiments of this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this disclosure are also applicable to similar technical problems.

[0064] This disclosure addresses the scenario of joint transmission using multiple TRPs. Since the locations of these TRPs may differ, meaning their propagation distances and directions to the terminal device may vary, the transmission parameters of each TRP at the terminal device may also differ. Therefore, a method for indicating TCI states is proposed. The network device indicates at least one and / or at least one pair of TCI states to the terminal device, allowing the terminal device to clearly understand the mapping relationship between each TCI state and a DMRS port or CDMgroup. In other words, the terminal device clearly understands which DMRS ports are quasi-co-located with the reference signal indicated by which TCI state, thereby improving the transmission performance of coherent joint transmission based on multiple TRPs.

[0065] It should be noted that, in this disclosure, any embodiment of the method for indicating the transmission configuration indication status can be executed alone, or can be executed together with possible implementation methods in other embodiments, or can be executed together with any technical solution in the related art.

[0066] The embodiments of this disclosure will now be further described in conjunction with the accompanying drawings and specific implementation details.

[0067] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0068] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0069] Depending on the context, the words “if” and “in response to” used here can be interpreted as “when”, “when”, or “in response to determination”.

[0070] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0071] Please see Figure 2 , Figure 2 This is a flowchart illustrating a method for indicating a transmission configuration indication status according to an embodiment of this disclosure. This method is executed by a terminal device. Figure 2 As shown, the method may include, but is not limited to, the following steps:

[0072] Step 201: Receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0073] Optionally, joint transmission can be a coherent joint transmission (CJT) implemented by multiple TRPs.

[0074] Optionally, the first indication information may include a first medium access control (MAC) control element (CE), wherein the first MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to a codepoint in the TCI field of the downlink control information (DCI).

[0075] A TCI state can be a joint TCI state, a downlink (DL) TCI state, or an uplink (UL) TCI state. A pair of TCI states represents one DL TCI state and one UL TCI state. A code point in a TCI field of a DCI can correspond to multiple TCI states, or multiple pairs of TCI states, or one TCI state and one pair of TCI states, or multiple TCI states and multiple pairs of TCI states, or one TCI state and multiple pairs of TCI states, or one TCI state and one pair of TCI states. This disclosure does not impose any limitations on this.

[0076] Alternatively, the first indication information may include a second MAC CE and downlink control information DCI, wherein the second MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to each of the multiple code points in the TCI field of the DCI, and the DCI is used to indicate one of the multiple code points.

[0077] In other words, the network device can first activate at least one and / or at least one pair of TCI states corresponding to multiple code points through the second MAC CE, and then indicate one of the multiple code points through DCI. Thus, the terminal device can determine the TCI state corresponding to each DMRS port or CDMgroup based on at least one and / or at least one pair of TCI states corresponding to the indicated code point, that is, determine which DMRS ports are quasi-co-addressed with the reference signal indicated by which TCI state or which pair of TCI states.

[0078] In this disclosure, the terminal device can receive at least one and / or at least one pair of TCI states sent by the network device for joint transmission, and then determine which DMRS port in the joint transmission is quasi-co-located with which first reference signal indicated by which pair of TCI states, thereby reliably realizing joint transmission based on multiple TRP and improving the transmission performance of CJT based on multiple TRP.

[0079] Please see Figure 3 , Figure 3 This is a flowchart illustrating a method for indicating a transmission configuration indication status according to an embodiment of this disclosure. This method is executed by a terminal device. Figure 3 As shown, the method may include, but is not limited to, the following steps:

[0080] Step 301: Receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0081] The specific implementation of step 301 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0082] Step 302: Determine the transmission parameters for joint transmission based on at least one and / or at least one pair of first reference signals indicated by TCI states respectively.

[0083] Optionally, the first reference signal can be a channel state information reference signal (CSI-RS). This CSI-RS can be a CSI-RS configured as a tracking reference signal (TRS), a CSI-RS configured with repeated repetitions, or a CSI-RS that is neither configured as a TRS nor with repetitions. The terminal device can determine the first reference signal for each or each pair of TCI states based on the CSI-RS identifier in each or each pair of TCI states. Then, based on the mapping relationship between TCI states and DMRS ports, it determines the first reference signal with a quasi-co-addressable relationship to each DMRS port. Afterward, based on the transmission parameters corresponding to the first reference signal, it can determine the transmission parameters corresponding to each DMRS port, i.e., determine the transmission parameters for joint transmission.

[0084] Optionally, the transmission parameters include at least one of the following: average delay, delay spread, Doppler shift, Doppler spread, and spatial Rx parameter.

[0085] Among them, the spatial reception parameters are also known as the quasi-co-address parameters of type D (QCL-Type D).

[0086] QCL typeA includes the following transmission parameters: Doppler shift, Doppler spread, average delay, delay spread; QCL typeB includes the following transmission parameters: Doppler shift, Doppler spread; QCL typeC includes the following transmission parameters: Doppler shift, average delay; QCL typeD includes the following transmission parameter: Spatial Rx parameter.

[0087] Optionally, the terminal device may determine the transmission parameters of the DMRS port of the Physical Downlink Shared Channel (PDSCH) based on a first reference signal indicated by at least one and / or at least one pair of joint TCI states or downlink TCI states respectively.

[0088] In other words, the terminal device can assume that the DMRS port of the PDSCH of each TRP is quasi-co-located with the downlink reference signal (DL RS) or uplink reference signal (UL RS) indicated by the corresponding TCI state.

[0089] Alternatively, the terminal device may determine the transmission parameters of the DMRS port of the Physical Uplink Shared Channel (PUSCH) based on a first reference signal indicated by at least one and / or at least one pair of joint TCI states or uplink TCI states respectively.

[0090] In other words, the terminal device can assume that all DMRS ports of the PUSCH of each TRP are quasi-co-located with the DL RS indicated by the TCI state, or the uplink reference signal (UL RS).

[0091] In this disclosure, after receiving at least one and / or at least one pair of TCI states for joint transmission sent by the network device, the terminal device can determine the TCI state corresponding to each DMRS port of the joint transmission according to the first reference signal indicated by the at least one and / or at least one pair of TCI states, and then determine the transmission parameters of the joint transmission, thereby reliably realizing coherent joint transmission based on multiple TRP and improving the transmission performance of CJT based on multiple TRP.

[0092] Please see Figure 4 , Figure 4 This is a flowchart illustrating a method for indicating a transmission configuration indication status according to an embodiment of this disclosure. This method is executed by a terminal device. Figure 4 As shown, the method may include, but is not limited to, the following steps:

[0093] Step 401: Receive second indication information sent by the network device, wherein the second indication information may be used to indicate at least one and / or at least one pair of TCI states, respectively, their mapping relationship with at least one DMRS port. Alternatively, the second indication information may be used to indicate at least one and / or at least one pair of TCI states, respectively, their mapping relationship with at least one CDM group.

[0094] Optionally, if the second indication information indicates the mapping relationship between the TCI status and the CDM group, then the DMRS ports belonging to a CDM group correspond to the same TCI status.

[0095] Optionally, a TCI state can correspond to at least one DMRS port. The number of DMRS ports corresponding to different TCI states can be the same or different; for example, some correspond to one DMRS port, while others correspond to two DMRS ports. This disclosure does not limit this.

[0096] For example, the second indication information indicates two TCI states, each mapped to at least one DMRS port. For instance, the second indication information might indicate that: combined TCI state 1 corresponds to DMRS port 0, and combined TCI state 2 corresponds to DMRS port 1; or combined TCI state 1 corresponds to both DMRS ports 0 and 1, and combined TCI state 2 corresponds to DMRS port 2.

[0097] Alternatively, the second indication information indicates two pairs of TCI states, each mapped to at least one DMRS port. For example, the second indication information indicates: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to DMRS port 1, and another pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to DMRS port 2.

[0098] Alternatively, the second indication information indicates one TCI state and one pair of TCI states, each corresponding to at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 1, and DL TCI state 2 and UL TCI state 2 correspond to DMRS port 2.

[0099] Alternatively, the second indication information indicates two TCI states, each mapped to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, and joint TCI state 2 corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0100] Alternatively, the second indication information indicates two pairs of TCI states, each mapped to a CDM group, wherein each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group may be the same or different. For example, the second indication information indicates: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to CDM group 1, and another pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0101] Alternatively, the second indication information indicates the mapping relationship between one TCI state and one pair of TCI states, respectively, and a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates: joint TCI state 1 corresponds to CDM group 1, and a pair of TCI states (DLTCI state 2 and UL TCI state 2) corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0102] Alternatively, the second indication information indicates the mapping relationship between four TCI states and at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 0, joint TCI state 2 corresponds to DMRS port 1, joint TCI state 3 corresponds to DMRS port 2, and joint TCI state 4 corresponds to DMRS port 3.

[0103] Alternatively, the second indication information indicates four pairs of TCI states, each corresponding to at least one DMRS port. For example, the second indication information indicates: a pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponding to DMRS port 0; a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponding to DMRS port 1; a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponding to DMRS port 2; and a pair of TCI states (DL TCI state 4 and UL TCI state 4) corresponding to DMRS port 3.

[0104] Alternatively, the second indication information indicates the mapping relationship between two TCI states and two pairs of TCI states, each corresponding to at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 0, joint TCI state 2 corresponds to DMRS port 1, a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to DMRS port 2; and a pair of TCI states (DL TCI state 4 and UL TCI state 4) corresponds to DMRS port 3.

[0105] Alternatively, the second indication information indicates the mapping relationship between three TCI states and a CDM group, wherein each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group may be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, joint TCI state 2 corresponds to CDM group 2, and joint TCI state 3 corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0106] Alternatively, the second indication information indicates the mapping relationship between three pairs of TCI states and a CDM group, wherein each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group may be the same or different. For example, the second indication information indicates that: a pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to CDM group 1, a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2, and a pair of TCI states (DL TCI state 3 and ULTCI state 3) corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0107] Alternatively, the second indication information indicates the mapping relationship between one TCI state and two pairs of TCI states, each corresponding to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2, and a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0108] It should be noted that in this disclosure, the mapping relationship between a TCI state, or a pair of TCI states and CDM groups, as well as the correspondence between CDM groups and DMRS ports, are all illustrative examples and should not be used as a limiting description of the technical solutions of this disclosure.

[0109] Optionally, in this disclosure, the terminal device may also determine, based on the default mapping relationship, at least one and / or at least one pair of TCI states to at least one DMRS port, or determine the mapping relationship between the at least one and / or at least one pair of TCI states to at least one CDM group.

[0110] The default mapping relationship can be agreed upon by the protocol.

[0111] Optionally, in the default mapping, different DMRS ports can correspond to different TCI states. Alternatively, different CDM groups can correspond to different TCI states (DMRS ports belonging to the same CDM group correspond to the same TCI state), or you can specify which DMRS ports correspond to the same TCI state.

[0112] Optionally, in the default mapping relationship, one TCI state can correspond to at least one DMRS port. The number of DMRS ports corresponding to different TCI states can be the same or different. For example, some correspond to one DMRS port, and some correspond to two DMRS ports. This disclosure does not limit this.

[0113] For example, the default mapping indicates the mapping relationship between two TCI states and at least one DMRS port. For instance, the second indication information might indicate: joint TCI state 1 corresponds to DMRS port 0, and joint TCI state 2 corresponds to DMRS port 1; or joint TCI state 1 corresponds to both DMRS ports 0 and 1, and joint TCI state 2 corresponds to DMRS port 2. Alternatively, the default mapping indicates the mapping relationship between two pairs of TCI states and at least one DMRS port. For instance, the second indication information might indicate: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to DMRS port 1, and another pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to DMRS port 2.

[0114] Alternatively, the default mapping indicates one TCI state and one pair of TCI states, each mapped to at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 1, and DL TCI state 2 and ULTCI state 2 correspond to DMRS port 2.

[0115] Alternatively, the default mapping indicates two TCI states, each mapped to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information suggests that: Joint TCI state 1 corresponds to CDM group 1, and Joint TCI state 2 corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0116] Alternatively, the default mapping indicates two pairs of TCI states, each mapped to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to CDM group 1, and another pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0117] Alternatively, the default mapping indicates the mapping relationship between one TCI state and one pair of TCI states, each corresponding to a CDM group. Each CDM group contains at least one number of DMRS ports, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates: combined TCI state 1 corresponds to CDM group 1, and a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0118] Alternatively, the default mapping indicates the mapping relationship between four TCI states and at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 0, joint TCI state 2 corresponds to DMRS port 1, joint TCI state 3 corresponds to DMRS port 2, and joint TCI state 4 corresponds to DMRS port 3.

[0119] Alternatively, the default mapping indicates four pairs of TCI states, each mapped to at least one DMRS port. For example, the second indication information indicates: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to DMRS port 0; one pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to DMRS port 1; one pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to DMRS port 2; and one pair of TCI states (DL TCI state 4 and UL TCI state 4) corresponds to DMRS port 3.

[0120] Alternatively, the default mapping indicates the mapping relationship between two TCI states and two pairs of TCI states, each corresponding to at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 0, joint TCI state 2 corresponds to DMRS port 1, a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to DMRS port 2; and a pair of TCI states (DL TCI state 4 and UL TCI state 4) corresponds to DMRS port 3.

[0121] Alternatively, the default mapping indicates three TCI states, each mapped to a CDM group, where each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, joint TCI state 2 corresponds to CDM group 2, and joint TCI state 3 corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0122] Alternatively, the default mapping indicates three pairs of TCI states, each mapped to a CDM group, wherein each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: a pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to CDM group 1, a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2, and a pair of TCI states (DL TCI state 3 and ULTCI state 3) corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0123] Alternatively, the default mapping indicates one TCI state and two pairs of TCI states, each mapped to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2, and a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0124] It should be noted that in this disclosure, the mapping relationship between a TCI state, or a pair of TCI states and CDM groups, as well as the correspondence between CDM groups and DMRS ports, are all illustrative examples and should not be used as a limiting description of the technical solutions of this disclosure.

[0125] Step 402: Receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0126] Steps 401 and 402 can be executed simultaneously, meaning the second instruction information and the first instruction information are indicated by a single instruction message; or, step 402 can be executed first, followed by step 401. This disclosure does not limit the execution of these steps.

[0127] Step 403: Determine the transmission parameters for joint transmission based on at least one and / or at least one pair of first reference signals indicated by TCI states and the DMRS port corresponding to each TCI state.

[0128] The specific implementation of steps 402 and 403 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0129] In this disclosure, after receiving at least one and / or at least one pair of TCI states indicated by the network device for joint transmission, the terminal device can determine the first reference signal with quasi-co-addressable relationship with each DMRS port in the joint transmission based on the transmission parameters corresponding to the first reference signal indicated by each TCI state and the DMRS port corresponding to each TCI state, and thus determine the transmission parameters of the joint transmission. This reliably realizes coherent joint transmission based on multiple TRPs and improves the transmission performance of CJT based on multiple TRPs.

[0130] Please see Figure 5 , Figure 5 This is a flowchart illustrating a method for indicating a transmission configuration indication status according to an embodiment of this disclosure. This method is executed by a remote terminal device. Figure 5 As shown, the method may include, but is not limited to, the following steps:

[0131] Step 501: Receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0132] Step 502: Receive the second instruction information sent by the network device.

[0133] The second indication information can be used to indicate at least one and / or at least one pair of TCI states, respectively, their mapping relationship with at least one DMRS port. Alternatively, the second indication information can be used to indicate at least one and / or at least one pair of TCI states, respectively, their mapping relationship with at least one CDM group.

[0134] The specific implementation of steps 501 and 502 described above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0135] Step 503: Determine that all transmission parameters corresponding to the first reference signal indicating the first TCI state in at least one and / or at least one pair of TCI states are used for the corresponding first DMRS port or first CDM group.

[0136] For example, if the second indication information indicates the mapping relationship between the first TCI state and the first DMRS port (or the first CDM group), or determines the mapping relationship between the first TCI state and the first DMRS port (or the first CDM group) based on the default mapping relationship, then the terminal device can determine that all transmission parameters corresponding to the first reference signal indicated by the first TCI state can be used for the first DMRS port (or each DMRS port in the first CDM group).

[0137] For example, the QCL type indicated by the first TCI status may include QCL Type A, where all transmission parameters of QCL Type A are average delay, delay spread, doppler shift, and doppler spread. These four parameters can all be used on the first DMRS port (or each DMRS port in the first CDM group). Alternatively, the QCL type indicated by the first TCI status may include QCL Type B, where all transmission parameters of QCL Type B are doppler shift and doppler spread. These two parameters can also be used on the first DMRS port (or each DMRS port in the first CDM group). Or, the QCL type indicated by the first TCI status may include QCL Type C, where all transmission parameters of QCL Type C are doppler shift and average delay. These two parameters can also be used on the first DMRS port (or each DMRS port in the first CDM group), and so on. This disclosure does not limit this to any particular type.

[0138] In this disclosure, after receiving at least one and / or at least one pair of TCI states for joint transmission indicated by the network device, and a DMRS port mapped to each TCI state, the terminal device can determine that the transmission parameters corresponding to the first reference signal indicated by each TCI state can be used for the corresponding DMRS port. This reliably realizes coherent joint transmission based on multiple TRPs, improving the transmission performance of CJT based on multiple TRPs.

[0139] Please see Figure 6 , Figure 6 This is a flowchart illustrating a method for indicating a transmission configuration indication status according to an embodiment of this disclosure. This method is executed by a remote terminal device. Figure 6 As shown, the method may include, but is not limited to, the following steps:

[0140] Step 601: Receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0141] Step 602: Receive the second instruction information sent by the network device.

[0142] The second indication information can be used to indicate at least one and / or at least one pair of TCI states, respectively, their mapping relationship with at least one DMRS port. Alternatively, the second indication information can be used to indicate at least one and / or at least one pair of TCI states, respectively, their mapping relationship with at least one CDM group.

[0143] The specific implementation of steps 601 and 602 described above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0144] Step 603: Determine the remaining transmission parameters, other than at least one specified transmission parameter, corresponding to the first reference signal indicating the second TCI state in at least one and / or at least one pair of TCI states, for the corresponding second DMRS port or second CDM group.

[0145] Step 604: Determine at least one specified transmission parameter corresponding to the first reference signal of the specified TCI status indication for the second DMRS port or the second CDM group.

[0146] The specified transmission parameters can be any one or more of the transmission parameters corresponding to the first reference signal or the joint transmission mentioned above. They can be indicated by the network device or agreed upon by the protocol, and this disclosure does not limit them.

[0147] Optionally, while Doppler shift and Doppler spread can be compensated for by network devices to be the same as other TRPs, average delay, delay spread, and spatial Rx parameters are not easily compensated if the TRP location is different. Therefore, in this disclosure, the specified transmission parameters can be at least one of Doppler shift and Doppler spread.

[0148] Optionally, the specified TCI state can be indicated by the network device; or it can be determined by the terminal device itself. For example, the specified TCI state can be the TCI state with the smallest TCI state identifier, or it can be the TCI state indicated by the low bit of MAC CE, or it can be the first TCI state indicated in the first indication information, etc. This disclosure does not limit it in this way.

[0149] For example, if the second indication information indicates the mapping relationship between the second TCI state and the second DMRS port (or the second CDM group), or determines the mapping relationship between the first TCI state and the second DMRS port (or the second CDM group) according to the default mapping relationship, then the terminal device can determine the remaining transmission parameters, except for Doppler shift and / or Doppler spread, corresponding to the first reference signal indicated by the second TCI state, for the second DMRS port (or each DMRS port in the second CDM group). In addition, the Doppler shift and / or Doppler spread corresponding to the first reference signal indicated by the specified TCI state are also used for the second DMRS port (or each DMRS port in the second CDM group).

[0150] It should be noted that when the second TCI state and the specified TCI state are not the same TCI state, the first reference signal indicated by the second TCI state is different from the first reference signal indicated by the specified TCI state. Therefore, the corresponding Doppler shift and / or Doppler spread are different.

[0151] In addition, if the second indication information indicates the mapping relationship between the specified TCI state and the third DMRS port (or the third CDM group), or determines the mapping relationship between the specified TCI state and the third DMRS port (or the third CDM group) according to the default mapping relationship, then it is directly determined that all transmission parameters corresponding to the first reference signal indicating the specified TCI state are used for the third DMRS port (or each DMRS port in the third CDM group).

[0152] In this disclosure, after receiving at least one and / or at least one pair of TCI states for joint transmission from the network device, and a DMRS port mapped to each TCI state, the terminal device can determine the remaining transmission parameters (excluding the specified transmission parameters) in the transmission parameters corresponding to the first reference signal of each TCI state indication, and the specified transmission parameters corresponding to the first reference signal of the specified TCI state indication, for use on the corresponding DMRS port. This reliably realizes coherent joint transmission based on multiple TRPs, improving the transmission performance of CJT based on multiple TRPs.

[0153] Please see Figure 7 , Figure 7 This is a flowchart illustrating a method for indicating a transmission configuration indication status according to an embodiment of this disclosure. This method is executed by a terminal device. Figure 7 As shown, the method may include, but is not limited to, the following steps:

[0154] Step 701: Receive the third instruction information.

[0155] The third indication information is used to indicate the second reference signal corresponding to each channel measurement resource (CMR) or channel state information reference signal (CSI RS) port group, or the second reference signal corresponding to each CMR group or CSI-RS port group set. A CMR group contains at least one CMR, and a CSI-RS port group set contains at least one CSI-RS port group.

[0156] In this system, there is a one-to-one correspondence between CMRs and TRPs, or a one-to-one correspondence between CSI RS port groups and TRPs. For example, if there are 32 CSI-RS ports, there are 4 TRPs, and each TRP corresponds to 8 ports. CMRs are CSI-RS resources used for channel measurements.

[0157] In other words, if the third indication information indicates the second reference signal corresponding to each CMR or CSI RS port group, that is, the number of second reference signals indicated by the third indication information is the same as the number of CMR or CSI RS port groups, i.e., it indicates the second reference signal corresponding to each TRP. Alternatively, if the third indication information indicates the second reference signal corresponding to each CMR group or set of CSI RS port groups, that is, the number of second reference signals indicated by the third indication information is less than the number of CMR or CSI RS port groups, i.e., it indicates the second reference signal corresponding to each TRP group. Each TRP group contains at least one TRP.

[0158] Step 702: Determine the transmission parameters corresponding to each second reference signal.

[0159] In this disclosure, after receiving the second reference signal corresponding to each CMR or CSI RS port group indicated by the network device, the terminal device can determine the transmission parameters corresponding to each second reference signal, such as determining at least one of average delay, delay spread, Doppler shift, Doppler spread, etc., corresponding to each second reference signal.

[0160] Step 703: Send fourth indication information to the network device, wherein the fourth indication information is used to indicate transmission parameters corresponding to at least one second reference signal.

[0161] Optionally, the fourth indication information can be indicated by a sounding reference signal (SRS). This involves adjusting the SRS based on at least one transmission parameter before transmission. For example, the transmission delay of the SRS can be set based on the average delay value of the second reference signal, and the impact of the Doppler parameters of the SRS can be adjusted based on at least one of the values ​​of Doppler shift and Doppler spread in the second reference signal before transmission. Each SRS corresponds to indicating the transmission parameters of a second reference signal.

[0162] Optionally, the fourth indication information can also be included in the Channel State Information (CSI). This allows the transmission parameters corresponding to at least one second reference signal to be displayed and fed back to the network device. For example, the value of at least one of the following corresponding to the second reference signal—averagedelay, delay spread, Doppler shift, and Doppler spread—is reported to the base station based on the CSI feedback framework. The CSI feedback framework is a reporting mechanism for feedback precoding matrix indication (PMI), rank indication (RI), layer indication (LI), channel quality indication (CQI), L1 layer reference signal received power (RSRP), and L1 layer signal-to-interference and noise ratio (SINR), etc.

[0163] Optionally, the fourth indication information may include the absolute value of the transmission parameter corresponding to each second reference signal; or, the fourth indication information may include the relative value of the transmission parameter corresponding to at least one second reference signal relative to the transmission parameter corresponding to a specified second reference signal.

[0164] The second reference signal can be indicated by the network device to the terminal device, or it can be determined by the terminal device and reported to the network device. This disclosure does not limit this.

[0165] In this disclosure, after the terminal device sends the relative value of the transmission parameter corresponding to at least one second reference signal, or the absolute value of the transmission parameter corresponding to each second reference signal, to the network device, the network device can determine the first reference signal of the transmission parameter to be indicated to the terminal device for joint transmission based on the transmission parameter corresponding to each second reference signal.

[0166] Optionally, the network device may select a second reference signal based on at least one transmission parameter corresponding to each second reference signal to determine the first reference signal in the TCI state to be indicated. For example, the network device may determine multiple second reference signals as the first reference signal respectively; or the network device may determine a specific second reference signal from multiple second reference signals as the first reference signal, wherein the specific second reference signal may be determined by the base station or indicated by the terminal, etc., and this disclosure does not limit this.

[0167] In this disclosure, the network device can determine the transmission parameters used by the terminal device for joint transmission based on the relative relationship between the transmission parameters corresponding to each of the second reference signals. That is, the terminal device may or may not report the transmission parameters corresponding to the specified second reference signal, and this disclosure does not limit this.

[0168] Step 704: Receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of TCI states for joint transmission.

[0169] Step 705: Determine the transmission parameters for joint transmission based on at least one and / or at least one pair of first reference signals indicated by TCI states respectively.

[0170] The specific implementation of steps 704 and 705 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0171] In this disclosure, after receiving the transmission parameters corresponding to at least one second reference signal reported by the terminal device, the network device can indicate the identifier of the first reference signal that can be used for joint transmission to the terminal device through at least one and / or at least one pair of TCI states. Thus, the terminal device can determine the transmission parameters of the corresponding DMRS port based on the transmission parameters corresponding to the first reference signal indicated in the at least one and / or at least one pair of TCI states and the correspondence between the TCI states and the DMRS port, and then perform joint transmission.

[0172] In other words, the terminal device may assume that each DMRS port of the PDSCH is quasi-co-located with the DL RS or UL RS indicated by the corresponding TCI state. And / or assume that each DMRS port of the PUSCH is quasi-co-located with the DL RS or UL RS indicated by the corresponding TCI state.

[0173] It should be noted that the QCL indicating the TCI status includes at least one of type A, B, C, and D. The reference signals indicated by QCL types A, B, C, and D can all be CSI RSs configured as TRS. However, the reference signal indicated by QCL type D may also be a CSI RS configured for repetition, or a CSI RS that is neither configured as TRS nor for repetition. In other words, the first reference signal here can only include the second reference signal; for example, the first reference signal is a CSI RS configured as TRS, and the second reference signal is also a CSI RS configured as TRS. The first reference signal can also include two different reference signals; for example, the first reference signal includes one CSI RS configured as TRS (i.e., the second reference signal), and one CSI RS configured for repetition, or one CSI RS that is neither configured as TRS nor for repetition.

[0174] In this disclosure, the terminal device first receives a third indication information sent by the network device, then determines the transmission parameters corresponding to each second reference signal indicated by the third indication information, and then sends the transmission parameters corresponding to at least one second reference signal to the network device. After receiving at least one and / or at least one pair of TCI states for joint transmission sent by the network device, the terminal device can determine the transmission parameters of each DMRS port according to the first reference signal indicated by the at least one and / or at least one pair of TCI states respectively, and the mapping relationship between the TCI states and the DMRS ports, that is, determine the transmission parameters of joint transmission, thereby reliably realizing coherent joint transmission based on multiple TRPs and improving the transmission performance of CJT based on multiple TRPs.

[0175] Please see Figure 8 , Figure 8 This is a flowchart illustrating another method for indicating the transmission configuration indication status provided in this disclosure, which is executed by a terminal device. Figure 8 As shown, the method may include, but is not limited to, the following steps:

[0176] Step 801: Receive the third instruction information.

[0177] The third indication information is used to indicate the second reference signal corresponding to each channel measurement resource (CMR) or channel state information reference signal (CSI RS) port group, or the second reference signal corresponding to each CMR group or CSI-RS port group set. A CMR group contains at least one CMR, and a CSI-RS port group set contains at least one CSI-RS port group.

[0178] Step 802: Determine the transmission parameters corresponding to each second reference signal.

[0179] The specific implementation of steps 801 and 802 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0180] Step 803: Receive the fifth indication information sent by the network device, wherein the fifth indication information is used to indicate the designated second reference signal.

[0181] Optionally, the fifth indication information may indicate only one designated second reference signal; or it may indicate a designated second reference signal in each group of second reference signals. That is, the fifth indication information can be used to indicate at least one designated reference signal.

[0182] For example, there are a total of four second reference signals, which are CSI-RS configured as TRS. These four second reference signals include four TRS resources or four TRS resource sets, each corresponding to one of the four TRPs. Then, a designated TRS is defined. The transmission parameters corresponding to the designated TRS can be either not fed back or fed back in absolute value. Thus, the terminal device can feed back the relative values ​​of the other three second reference signals with respect to the transmission parameters corresponding to this designated TRS.

[0183] There can be a total of 4 TRS resources or 4 TRS sets, each corresponding to one of the 4 TRPs. The 4 TRSs can be divided into 2 groups: the first and second TRSs form the first group, and the third and fourth TRSs form the second group. Each group has a designated TRS. The transmission parameters corresponding to the designated TRS can either not be fed back or can only be fed back as absolute values. Other TRSs within the same group can feed back their relative values ​​to the transmission parameters corresponding to the designated TRS within the same group.

[0184] In this disclosure, step 803 may also precede step 802, for example, steps 803 and 801 may be executed simultaneously, and this disclosure does not limit this.

[0185] Step 804: Send fourth indication information to the network device, wherein the fourth indication information includes the relative value of the transmission parameter corresponding to at least one second reference signal relative to the transmission parameter corresponding to the specified second reference signal.

[0186] In this disclosure, if a terminal device receives a designated second reference signal indicated by a network device, then when reporting the transmission parameters corresponding to the second reference signal, the terminal device can only report the relative values ​​of the transmission parameters corresponding to the other second reference signals relative to the transmission parameters corresponding to the designated second reference signal. Subsequently, the network device can determine the relationship between the transmission parameters corresponding to each second reference signal, and then determine the first reference signal that the terminal device can jointly transmit based on its corresponding transmission parameters.

[0187] Step 805: Receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0188] Step 806: Determine the transmission parameters for joint transmission based on at least one and / or at least one pair of first reference signals indicated by TCI states respectively.

[0189] The specific implementation of steps 805 and 806 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0190] In this disclosure, the terminal device first receives multiple second reference signals sent by the network device, then determines the transmission parameters corresponding to each second reference signal, and then reports the relative values ​​between the transmission parameters corresponding to the remaining second reference signals and the transmission parameters corresponding to the specified second reference signals indicated by the network device to the network device. After receiving at least one and / or at least one pair of TCI states sent by the network device for joint transmission, the terminal device can determine the transmission parameters of multiple DMRS ports in the joint transmission according to the first reference signals indicated by the at least one and / or at least one pair of TCI states, thereby reliably realizing coherent joint transmission based on multiple TRPs and improving the transmission performance of CJT based on multiple TRPs.

[0191] Please see Figure 9 , Figure 9 This is a flowchart illustrating another method for indicating the transmission configuration indication status provided in this disclosure, which is executed by a terminal device. Figure 9 As shown, the method may include, but is not limited to, the following steps:

[0192] Step 901: Receive the third instruction information.

[0193] The third indication information is used to indicate the second reference signal corresponding to each channel measurement resource (CMR) or channel state information reference signal (CSI RS) port group, or the second reference signal corresponding to each CMR group or CSI-RS port group set. A CMR group contains at least one CMR, and a CSI-RS port group set contains at least one CSI-RS port group.

[0194] Step 902: Determine the transmission parameters corresponding to each second reference signal.

[0195] The specific implementation of steps 801 and 802 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0196] Step 903: The second reference signal that meets the specified conditions is determined as the specified second reference signal.

[0197] Step 904: Send a sixth indication message to the network device, wherein the sixth indication message is used to indicate at least one designated second reference signal.

[0198] Optionally, the terminal device can determine the specified reference signal based on the time delay corresponding to each reference signal.

[0199] For example, if, among multiple second reference signals, the time delay corresponding to a candidate second reference signal is less than the time delay corresponding to each of the other second reference signals, then the candidate second reference signal is determined to satisfy a specified condition. Here, the candidate second reference signal may be any one of the multiple second reference signals.

[0200] Alternatively, if the network device further divides the multiple second reference signals into different groups, the terminal device can also determine the second reference signal in each group that meets a specified condition, that is, determine a specified second reference signal in each group. For example, if the time delay corresponding to a candidate second reference signal in any second reference signal group is less than the time delay corresponding to each of the other second reference signals in any reference signal group, then the candidate second reference signal in any reference signal group is determined to meet the specified condition.

[0201] For example, there are four TRS resources or four TRS resource sets, each corresponding to one of the four TRPs. These four TRSs can be divided into two groups: the first and second TRS form the first group, and the third and fourth TRS form the second group. The terminal device can then determine a specific reference signal in the first group and another in the second group. For instance, if the delay corresponding to the first TRS in the first group is less than that of the second TRS, then the first TRS can be determined as the specified reference signal in the first group. Therefore, when sending transmission parameters to the network device, only the relative values ​​of the transmission parameters corresponding to the second TRS and the first TRS need to be fed back. The feedback method for the transmission parameters corresponding to the reference signals in the second group is similar to that in the first group and will not be elaborated here.

[0202] Alternatively, if the network device does not group the multiple second reference signals into different groups, the terminal device can group the multiple second reference signals based on latency. It then determines a second reference signal in each group that meets a specified condition, i.e., it identifies a specific second reference signal in each group. For example, if the latency of a candidate second reference signal in any group is less than the latency of each of the other second reference signals in that group, then the candidate second reference signal in that group is determined to meet the specified condition.

[0203] For example, there are four TRS resources or four TRS resource sets, each corresponding to one of the four TRPs. The terminal first determines the delay corresponding to each TRS, designates the TRS with the smallest delay as the first designated reference signal, and groups the other TRS whose delay difference from the first designated reference signal is within a threshold value. If there are remaining TRS whose delay difference from the first designated reference signal is greater than the threshold value, the TRS with the smallest delay among the remaining TRS is designated as the second designated reference signal. Similarly, TRS whose delay difference from the second designated reference signal is within a threshold value are grouped with the second designated reference signal, and so on. Thus, the terminal determines at least one group and the designated reference signal corresponding to each group. When the terminal provides feedback, it needs to provide the relative values ​​of the transmission parameters corresponding to each other reference signal relative to the transmission parameters corresponding to the corresponding designated reference signal, as well as the reference signal ID of the corresponding designated reference signal. Furthermore, the transmission parameters corresponding to the designated TRS may not be fed back or may be fed back in absolute value. This threshold value can be indicated by the base station or specified in the protocol.

[0204] Once the terminal device has identified the designated reference signal, it can send the identifier of the designated reference signal to the network device.

[0205] Step 905: Send fourth indication information to the network device, wherein the fourth indication information includes the relative value of the transmission parameter corresponding to at least one second reference signal relative to the transmission parameter corresponding to the specified second reference signal.

[0206] Optionally, steps 905 and 904 can be performed simultaneously. For example, the fourth instruction information and the sixth instruction information may be contained in the same information, and this disclosure does not limit this.

[0207] Step 906: Receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0208] Step 907: Determine the transmission parameters for joint transmission based on at least one and / or at least one pair of first reference signals indicating TCI status.

[0209] The specific implementation of steps 905 to 907 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0210] In this disclosure, after the terminal device first receives the second reference signal corresponding to each CMR or CSI RS port group sent by the network device, it can first determine the transmission parameters corresponding to each second reference signal, and then determine the second reference signal that meets the specified conditions as the specified second reference signal. Then, it sends at least one transmission parameter corresponding to the second reference signal to the network device. The relative values ​​between the transmission parameters corresponding to the specified second reference signal are then sent. After receiving at least one and / or at least one pair of TCI states sent by the network device for joint transmission, the transmission parameters of each corresponding DMRS port in the joint transmission can be determined according to the first reference signal indicated by the at least one and / or at least one pair of TCI states. This reliably realizes coherent joint transmission based on multiple TRP and improves the transmission performance of CJT based on multiple TRP.

[0211] Please see Figure 10 Please see Figure 10 , Figure 10 This is a flowchart illustrating another method for indicating transmission configuration status provided in this disclosure, which is executed by a network device. Figure 10 As shown, the method may include, but is not limited to, the following steps:

[0212] Step 1001: Send first indication information to the terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0213] Optionally, joint transmission can be a coherent joint transmission (CJT) implemented by multiple TRPs.

[0214] Optionally, the first indication information may include a first medium access control (MAC) control element (CE), wherein the first MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to a codepoint in the TCI field of the downlink control information (DCI).

[0215] A TCI state can be a joint TCI state, a downlink (DL) TCI state, or an uplink (UL) TCI state. A pair of TCI states represents one DL TCI state and one UL TCI state. A code point in a TCI field of a DCI can correspond to multiple TCI states, or multiple pairs of TCI states, or one TCI state and one pair of TCI states, or multiple TCI states and multiple pairs of TCI states, or one TCI state and multiple pairs of TCI states, or one TCI state and one pair of TCI states. This disclosure does not impose any limitations on this.

[0216] Alternatively, the first indication information may include a second MAC CE and downlink control information DCI, wherein the second MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to each of the multiple code points in the TCI field of the DCI, and the DCI is used to indicate one of the multiple code points.

[0217] In other words, the network device can first activate at least one and / or at least one pair of TCI states corresponding to multiple code points through the second MAC CE, and then indicate one of the multiple code points through DCI. Thus, the terminal device can determine the TCI state corresponding to each DMRS port or CDMgroup based on at least one and / or at least one pair of TCI states corresponding to the indicated code point, that is, determine which DMRS ports are quasi-co-addressed with the reference signal indicated by which TCI state or which pair of TCI states.

[0218] In this disclosure, the network device can send at least one and / or at least one pair of TCI states for joint transmission to the terminal device. This enables the terminal device to determine which quasi-co-addressable first reference signal(s) indicates which DMRS port(s) in the joint transmission, thereby reliably realizing multi-TRP-based joint transmission and improving the transmission performance of multi-TRP-based CJT.

[0219] Please see Figure 11 , Figure 11 This is a flowchart illustrating another method for indicating transmission configuration status provided in this disclosure, which is executed by a network device. Figure 11 As shown, the method may include, but is not limited to, the following steps:

[0220] Step 1101: Send second indication information to the terminal device, wherein the second indication information is used to indicate the mapping relationship between at least one and / or at least one pair of TCI states and at least one DMRS port, or the second indication information is used to indicate the mapping relationship between at least one and / or at least one pair of TCI states and at least one CDM group.

[0221] Optionally, a TCI state can correspond to at least one DMRS port. The number of DMRS ports corresponding to different TCI states can be the same or different; for example, some correspond to one DMRS port, while others correspond to two DMRS ports. This disclosure does not limit this.

[0222] For example, the second indication information indicates two TCI states, each mapped to at least one DMRS port. For instance, the second indication information might indicate that: combined TCI state 1 corresponds to DMRS port 0, and combined TCI state 2 corresponds to DMRS port 1; or combined TCI state 1 corresponds to both DMRS ports 0 and 1, and combined TCI state 2 corresponds to DMRS port 2.

[0223] Alternatively, the second indication information indicates two pairs of TCI states, each mapped to at least one DMRS port. For example, the second indication information indicates: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to DMRS port 1, and another pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to DMRS port 2.

[0224] Alternatively, the second indication information indicates one TCI state and one pair of TCI states, each corresponding to at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 1, and DL TCI state 2 and UL TCI state 2 correspond to DMRS port 2.

[0225] Alternatively, the second indication information indicates two TCI states, each mapped to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, and joint TCI state 2 corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0226] Alternatively, the second indication information indicates two pairs of TCI states, each mapped to a CDM group, wherein each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group may be the same or different. For example, the second indication information indicates: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to CDM group 1, and another pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0227] Alternatively, the second indication information indicates the mapping relationship between one TCI state and one pair of TCI states, respectively, and a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates: joint TCI state 1 corresponds to CDM group 1, and a pair of TCI states (DLTCI state 2 and UL TCI state 2) corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0228] Alternatively, the second indication information indicates the mapping relationship between four TCI states and at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 0, joint TCI state 2 corresponds to DMRS port 1, joint TCI state 3 corresponds to DMRS port 2, and joint TCI state 4 corresponds to DMRS port 3.

[0229] Alternatively, the second indication information indicates four pairs of TCI states, each corresponding to at least one DMRS port. For example, the second indication information indicates: a pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponding to DMRS port 0; a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponding to DMRS port 1; a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponding to DMRS port 2; and a pair of TCI states (DL TCI state 4 and UL TCI state 4) corresponding to DMRS port 3.

[0230] Alternatively, the second indication information indicates the mapping relationship between two TCI states and two pairs of TCI states, each corresponding to at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 0, joint TCI state 2 corresponds to DMRS port 1, a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to DMRS port 2; and a pair of TCI states (DL TCI state 4 and UL TCI state 4) corresponds to DMRS port 3.

[0231] Alternatively, the second indication information indicates the mapping relationship between three TCI states and a CDM group, wherein each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group may be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, joint TCI state 2 corresponds to CDM group 2, and joint TCI state 3 corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0232] Alternatively, the second indication information indicates the mapping relationship between three pairs of TCI states and a CDM group, wherein each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group may be the same or different. For example, the second indication information indicates that: a pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to CDM group 1, a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2, and a pair of TCI states (DL TCI state 3 and ULTCI state 3) corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0233] Alternatively, the second indication information indicates the mapping relationship between one TCI state and two pairs of TCI states, each corresponding to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2, and a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0234] It should be noted that in this disclosure, the mapping relationship between a TCI state, or a pair of TCI states and CDM groups, as well as the correspondence between CDM groups and DMRS ports, are all illustrative examples and should not be used as a limiting description of the technical solutions of this disclosure.

[0235] Optionally, in this disclosure, the mapping relationship can also be defaulted. The terminal device can determine the mapping relationship between at least one and / or at least one pair of TCI states and at least one DMRS port, or determine the mapping relationship between the at least one and / or at least one pair of TCI states and at least one CDM group, based solely on the default mapping relationship without the instruction from the network device.

[0236] The default mapping relationship can be agreed upon by the protocol.

[0237] Optionally, in the default mapping, different DMRS ports can correspond to different TCI states. Alternatively, different CDM groups can correspond to different TCI states (DMRS ports belonging to the same CDM group correspond to the same TCI state), or you can specify which DMRS ports correspond to the same TCI state.

[0238] Optionally, in the default relationship, it is possible to support one TCI state corresponding to at least one DMRS port. The number of DMRS ports corresponding to different TCI states can be the same or different. For example, some correspond to one DMRS port, and some correspond to two DMRS ports.

[0239] For example, the default mapping indicates the mapping relationship between two TCI states and at least one DMRS port. For instance, the second indication information might indicate: joint TCI state 1 corresponds to DMRS port 0, and joint TCI state 2 corresponds to DMRS port 1; or joint TCI state 1 corresponds to both DMRS ports 0 and 1, and joint TCI state 2 corresponds to DMRS port 2. Alternatively, the default mapping indicates the mapping relationship between two pairs of TCI states and at least one DMRS port. For instance, the second indication information might indicate: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to DMRS port 1, and another pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to DMRS port 2.

[0240] Alternatively, the default mapping indicates one TCI state and one pair of TCI states, each mapped to at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 1, and DL TCI state 2 and ULTCI state 2 correspond to DMRS port 2.

[0241] Alternatively, the default mapping indicates two TCI states, each mapped to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information suggests that: Joint TCI state 1 corresponds to CDM group 1, and Joint TCI state 2 corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0242] Alternatively, the default mapping indicates two pairs of TCI states, each mapped to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to CDM group 1, and another pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0243] Alternatively, the default mapping indicates the mapping relationship between one TCI state and one pair of TCI states, each corresponding to a CDM group. Each CDM group contains at least one number of DMRS ports, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates: combined TCI state 1 corresponds to CDM group 1, and a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2. Here, CDM group 1 contains DMRS port 0, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2; or, CDM group 1 contains DMRS port 0 and DMRS port 1, and CDM group 2 contains DMRS port 2 and DMRS port 3, etc., and this is not limited here.

[0244] Alternatively, the default mapping indicates the mapping relationship between four TCI states and at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 0, joint TCI state 2 corresponds to DMRS port 1, joint TCI state 3 corresponds to DMRS port 2, and joint TCI state 4 corresponds to DMRS port 3.

[0245] Alternatively, the default mapping indicates four pairs of TCI states, each mapped to at least one DMRS port. For example, the second indication information indicates: one pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to DMRS port 0; one pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to DMRS port 1; one pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to DMRS port 2; and one pair of TCI states (DL TCI state 4 and UL TCI state 4) corresponds to DMRS port 3.

[0246] Alternatively, the default mapping indicates the mapping relationship between two TCI states and two pairs of TCI states, each corresponding to at least one DMRS port. For example, the second indication information indicates that: joint TCI state 1 corresponds to DMRS port 0, joint TCI state 2 corresponds to DMRS port 1, a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to DMRS port 2; and a pair of TCI states (DL TCI state 4 and UL TCI state 4) corresponds to DMRS port 3.

[0247] Alternatively, the default mapping indicates three TCI states, each mapped to a CDM group, where each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, joint TCI state 2 corresponds to CDM group 2, and joint TCI state 3 corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0248] Alternatively, the default mapping indicates three pairs of TCI states, each mapped to a CDM group, wherein each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: a pair of TCI states (DL TCI state 1 and UL TCI state 1) corresponds to CDM group 1, a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2, and a pair of TCI states (DL TCI state 3 and ULTCI state 3) corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0249] Alternatively, the default mapping indicates one TCI state and two pairs of TCI states, each mapped to a CDM group. Each CDM group contains at least one DMRS port, and the number of DMRS ports in each CDM group can be the same or different. For example, the second indication information indicates that: joint TCI state 1 corresponds to CDM group 1, a pair of TCI states (DL TCI state 2 and UL TCI state 2) corresponds to CDM group 2, and a pair of TCI states (DL TCI state 3 and UL TCI state 3) corresponds to CDM group 3. CDM group 1 contains DMRS port 0, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4; or, CDM group 1 contains DMRS port 0 and DMRS port 1, CDM group 2 contains DMRS port 2 and DMRS port 3, and CDM group 3 contains DMRS port 4 and DMRS port 5, etc., and so on. No specific limitation is made here.

[0250] It should be noted that in this disclosure, the mapping relationship between a TCI state, or a pair of TCI states and CDM groups, as well as the correspondence between CDM groups and DMRS ports, are all illustrative examples and should not be used as a limiting description of the technical solutions of this disclosure.

[0251] Step 1102: Send first indication information to the terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of TCI states for joint transmission.

[0252] In this disclosure, there is no limitation on the execution order of the above steps 1101 and 1102. That is, step 1102 can be executed first, followed by step 1101, or steps 1101 and 1102 can be executed simultaneously, etc.

[0253] In this disclosure, the network device can indicate to the terminal device at least one and / or at least one pair of TCI states for joint transmission, and the mapping relationship between multiple TCI states and DMRS ports or CDM groups, respectively. This enables the terminal device to accurately determine the transmission parameters corresponding to each DMRS port in the joint transmission, thereby reliably realizing coherent joint transmission based on multiple TRPs and improving the transmission performance of CJT based on multiple TRPs.

[0254] Please see Figure 12 , Figure 12 This is a flowchart illustrating a method for indicating a transmission configuration indication status according to an embodiment of this disclosure. This method is executed by a remote terminal device. Figure 12 As shown, the method may include, but is not limited to, the following steps:

[0255] Step 1201: Send third instruction information to the terminal device.

[0256] The third indication information is used to indicate the second reference signal corresponding to each CMR or CSI RS port group, or the second reference signal corresponding to each CMR group or CSI-RS port group set. A CMR group contains at least one CMR, and a CSI-RS port group set contains at least one CSI-RS port group.

[0257] In this system, there is a one-to-one correspondence between CMRs and TRPs, or a one-to-one correspondence between CSI RS port groups and TRPs. For example, if there are 32 CSI-RS ports, there are 4 TRPs, and each TRP corresponds to 8 ports. CMRs are CSI-RS resources used for channel measurements.

[0258] In other words, if the third indication information indicates the second reference signal corresponding to each CMR or CSI RS port group, that is, the number of second reference signals indicated by the third indication information is the same as the number of CMR or CSI RS port groups, i.e., it indicates the second reference signal corresponding to each TRP. Alternatively, if the third indication information indicates the second reference signal corresponding to each CMR group or set of CSI RS port groups, that is, the number of second reference signals indicated by the third indication information is less than the number of CMR or CSI RS port groups, i.e., it indicates the second reference signal corresponding to each TRP group. Each TRP group contains at least one TRP.

[0259] In this disclosure, the network device can send the RS corresponding to each TRP to the terminal device. Then, the terminal device can determine the transmission parameters corresponding to each RS, such as determining at least one of average delay, delay spread, Doppler shift, and Doppler spread for each RS.

[0260] Step 1202: Receive fourth indication information sent by the terminal device, wherein the third indication information is used to indicate transmission parameters corresponding to at least one second reference signal.

[0261] Optionally, the SRS can be adjusted based on at least one transmission parameter before transmission. For example, the transmission delay of the SRS can be set based on the average delay value of the second reference signal, and the impact of the Doppler parameters of the SRS can be adjusted based on the values ​​of at least one of the Doppler shift and Doppler spread of the second reference signal before transmission. Each SRS corresponds to a transmission parameter of a second reference signal.

[0262] Optionally, the fourth indication information can also be included in the CSI. This allows the transmission parameters corresponding to at least one second reference signal to be displayed and fed back to the network device. For example, the value of at least one of the average delay, delayspread, Doppler shift, and Doppler spread corresponding to the second reference signal is reported to the base station based on the CSI feedback framework. The CSI feedback framework is a reporting mechanism for feedback precoding matrix indication (PMI), rank indication (RI), layer indication (LI), channel quality indication (CQI), L1 layer reference signal received power (RSRP), L1 layer signal to interference and noise ratio (SINR), etc.

[0263] The second reference signal can be indicated by the network device to the terminal device, or it can be determined by the terminal device and reported to the network device. This disclosure does not limit this.

[0264] In this disclosure, after the terminal device sends the relative value of the transmission parameter corresponding to at least one second reference signal, or the absolute value of the transmission parameter corresponding to each second reference signal, to the network device, the network device can determine the first reference signal of the transmission parameter to be indicated to the terminal device for joint transmission based on the transmission parameter corresponding to each second reference signal.

[0265] Optionally, the network device may select a second reference signal based on at least one transmission parameter corresponding to each second reference signal to determine the first reference signal in the TCI state to be indicated. For example, the network device may determine multiple second reference signals as the first reference signal respectively; or the network device may determine a specific second reference signal from multiple second reference signals as the first reference signal, wherein the specific second reference signal may be determined by the base station or indicated by the terminal, etc., and this disclosure does not limit this.

[0266] In this disclosure, the network device can determine the transmission parameters used by the terminal device for joint transmission based on the relative relationship between the transmission parameters corresponding to each of the second reference signals. That is, the terminal device may or may not report the transmission parameters corresponding to the specified second reference signal, and this disclosure does not limit this.

[0267] Step 1203: Send first indication information to the terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of TCI states for joint transmission.

[0268] In this disclosure, after receiving the transmission parameters corresponding to the second reference signal sent by the terminal device, the network device can determine the first reference signal upon which the terminal device can perform joint transmission, and indicate the first reference signal to the terminal device through at least one and / or at least one pair of TCI states. The terminal device can then perform joint transmission based on the transmission parameters corresponding to the first reference signal indicated in the TCI states sent by the network device.

[0269] In other words, the terminal device can assume that each DMRS port of the PDSCH is quasi-co-located with the corresponding TCI state indication downlink reference signal DL RS or uplink reference signal UL RS. It also assumes that each DMRS port of the PUSCH is quasi-co-located with the corresponding TCI state indication DL RS or UL RS.

[0270] It should be noted that the QCL indicating the TCI status includes at least one of type A, B, C, and D. The reference signals indicated by QCL types A, B, C, and D can all be CSI RSs configured as TRS. However, the reference signal indicated by QCL type D may also be a CSI RS configured for repetition, or a CSI RS that is neither configured as TRS nor for repetition. In other words, the first reference signal here can only include the second reference signal; for example, the first reference signal is a CSI RS configured as TRS, and the second reference signal is also a CSI RS configured as TRS. The first reference signal can also include two different reference signals; for example, the first reference signal includes one CSI RS configured as TRS (i.e., the second reference signal), and one CSI RS configured for repetition, or one CSI RS that is neither configured as TRS nor for repetition.

[0271] In this disclosure, the network device first sends multiple second reference signals to the terminal device. Then, after receiving the transmission parameters corresponding to at least one second reference signal sent by the terminal device, it sends a first reference signal for joint transmission to the terminal device through at least one and / or at least one pair of TCI states. Thus, the terminal device can accurately determine the transmission parameters of each DMRS port in the joint transmission, thereby reliably realizing coherent joint transmission based on multiple TRPs and improving the transmission performance of CJT based on multiple TRPs.

[0272] Please see Figure 13 , Figure 13This is a flowchart illustrating another method for indicating transmission configuration status provided in this disclosure, which is executed by a network device. Figure 13 As shown, the method may include, but is not limited to, the following steps:

[0273] Step 1301: Send third instruction information to the terminal device.

[0274] The third indication information is used to indicate the second reference signal corresponding to each CMR or CSI RS port group, or the second reference signal corresponding to each CMR group or CSI-RS port group set. A CMR group contains at least one CMR, and a CSI-RS port group set contains at least one CSI-RS port group.

[0275] Among them, CMR corresponds one-to-one with TRP, and CSI RS port group corresponds one-to-one with TRP. For example, the number of CSI-RS ports is 32, with 4 TRPs and each TRP corresponds to 8 ports.

[0276] In this disclosure, the network device can send the RS corresponding to each TRP to the terminal device. Then, the terminal device can determine the transmission parameters corresponding to each RS, such as the average delay, delay spread, Doppler shift, Doppler spread, etc. corresponding to each RS.

[0277] The specific implementation of step 1301 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0278] Step 1302: Send fifth indication information to the terminal device, wherein the fifth indication information is used to indicate the designated second reference signal.

[0279] Optionally, the fifth indication information may indicate only one designated second reference signal; or it may indicate a designated second reference signal in each group of second reference signals. That is, the fifth indication information can be used to indicate at least one designated reference signal.

[0280] For example, there are a total of four second reference signals, which are CSI-RS configured as TRS. These four second reference signals include four TRS resources or four TRS resource sets, each corresponding to one of the four TRPs. Then, a designated TRS is defined. The transmission parameters corresponding to the designated TRS can be either not fed back or fed back in absolute value. Thus, the terminal device can feed back the relative values ​​of the other three second reference signals with respect to the transmission parameters corresponding to this designated TRS.

[0281] There can be a total of 4 TRS resources or 4 TRS sets, each corresponding to one of the 4 TRPs. The 4 TRSs can be divided into 2 groups: the first and second TRSs form the first group, and the third and fourth TRSs form the second group. Each group has a designated TRS. The transmission parameters corresponding to the designated TRS can either not be fed back or can only be fed back as absolute values. Other TRSs within the same group can feed back their relative values ​​to the transmission parameters corresponding to the designated TRS within the same group.

[0282] Step 1303: Receive fourth indication information sent by the terminal device, wherein the fourth indication information includes the relative value of the transmission parameter corresponding to at least one second reference signal relative to the transmission parameter of the specified reference signal.

[0283] The specific implementation of step 1303 above can be found in the detailed description of any embodiment of this disclosure, and will not be repeated here.

[0284] In this disclosure, the network device can determine the transmission parameters used by the terminal device for joint transmission based on the relative relationships between the transmission parameters corresponding to each of the second reference signals. That is, the terminal device may not report the transmission parameters corresponding to a designated second reference signal. Therefore, the network device can designate at least one second reference signal as a designated second reference signal to the terminal device, after which the terminal device can only report the relative values ​​of the transmission parameters corresponding to the remaining second reference signals relative to the transmission parameters corresponding to the designated second reference signal.

[0285] Optionally, in this disclosure, the terminal device may determine the designated second reference signal and report the determined designated second reference signal to the network device through indication information. That is, in one possible implementation of this disclosure, the network device may also receive a sixth indication information sent by the terminal device, wherein the fifth indication information is used for the designated second reference signal.

[0286] Step 1304: Send first indication information to the terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of TCI states for joint transmission.

[0287] In this disclosure, the network device first indicates multiple reference signals and at least one designated second reference signal to the terminal device. Then, after receiving the relative values ​​between the transmission parameters corresponding to the at least one second reference signal and the designated second reference signal sent by the terminal device, the network device sends at least one and / or at least one pair of TCI states for joint transmission to the terminal device. Thus, the terminal device can determine the transmission parameters of each DMRS port for joint transmission based on the first reference signals indicated by the at least one and / or at least one pair of TCI states, thereby reliably realizing coherent joint transmission based on multiple TRPs and improving the transmission performance of CJT based on multiple TRPs.

[0288] Figure 14 This is a schematic diagram of the structure of a communication device 1400 provided in an embodiment of the present disclosure. Figure 14 The communication device 100 shown may include a processing module 1401 and a transceiver module 1402.

[0289] It is understood that the communication device 1400 can be a terminal device, a device within a terminal device, or a device compatible with a terminal device. Alternatively, the communication device 1400 can be a network device, a device within a network device, or a device compatible with a network device.

[0290] Optionally, the communication device 1400 is located on the terminal equipment side, wherein:

[0291] The transceiver module 1402 is configured to receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0292] Optionally, the processing module 1401 is configured to determine the transmission parameters of the joint transmission based on the first reference signal indicating at least one and / or at least one pair of TCI states.

[0293] Optionally, the transmission parameters include at least one of the following:

[0294] Average delay, delay spread, Doppler shift, Doppler spread, and spatial reception parameters.

[0295] Optionally, the processing module 1401 is specifically used for:

[0296] Based on the first reference signal indicated by the joint TCI state or downlink TCI state in at least one and / or at least one pair of TCI states, the transmission parameters of the DMRS port of the Physical Downlink Shared Channel (PDSCH) are determined; or,

[0297] The transmission parameters of the DMRS port of the Physical Uplink Shared Channel (PUSCH) are determined based on the first reference signal indicated by the joint TCI state or uplink TCI state in at least one and / or at least one pair of TCI states.

[0298] Optionally, the first indication information includes a first media access control (MAC) control unit (CE), wherein the first MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to a code point in the TCI field of the downlink control information (DCI).

[0299] Optionally, the first indication information includes a second MAC CE and a DCI, wherein the second MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to each of the multiple code points in the TCI field of the DCI, and the DCI is used to indicate one of the multiple code points.

[0300] Optionally, the transceiver module 1402 is further configured to receive second indication information sent by the network device, the second indication information being used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one demodulation reference signal (DMRS) port, or the second indication information being used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one code division multiplexing (CDM) group; or,

[0301] The processing module 1401 is further configured to determine, based on the default mapping relationship, the mapping relationship between the at least one and / or at least one pair of TCI states and at least one DMRS port, or the mapping relationship between the at least one and / or at least one pair of TCI states and at least one CDM group.

[0302] Optionally, the processing module 1401 is further configured to determine that all transmission parameters corresponding to the first reference signal of the first TCI state indication in at least one and / or at least one pair of TCI states are used for the corresponding first DMRS port or first CDM group.

[0303] Optionally, the processing module 1401 is further configured to determine the remaining transmission parameters, excluding at least one specified transmission parameter, corresponding to the first reference signal of the second TCI state indication in at least one and / or at least one pair of TCI states, for the corresponding second DMRS port or second CDM group.

[0304] Determine at least one specified transmission parameter corresponding to the first reference signal indicating the specified TCI status, for the second DMRS port or the second CDM group.

[0305] Optionally, the TCI state identifier is the smallest TCI state, the TCI state indicated by the low bit of MAC CE, and the first TCI state indicated by the first indication information.

[0306] Optionally, the transceiver module 1402 is further configured to receive third indication information sent by the network device, wherein the third indication information is used to indicate the second reference signal corresponding to each Channel Measurement Resource (CMR) or Channel State Information Reference Signal (CSI RS) port group, or the second reference signal corresponding to each CMR group or CSI RS port group set, wherein a CMR group contains at least one CMR, and a CSI RS port group set contains at least one CSI RS port group.

[0307] The processing module 1401 is further configured to determine the transmission parameters corresponding to each of the second reference signals;

[0308] The transceiver module 1402 is further configured to send fourth indication information to the network device, wherein the fourth indication information is used to indicate transmission parameters corresponding to at least one second reference signal.

[0309] Optionally, the fourth indication information is indicated by a sounding reference signal (SRS), or the fourth indication information is included in the channel state information (CSI).

[0310] Optionally, the fourth indication information includes the absolute value of the transmission parameter corresponding to each second reference signal; or,

[0311] The fourth indication information includes the relative value of at least one transmission parameter corresponding to the second reference signal relative to the transmission parameter corresponding to the specified second reference signal.

[0312] Optionally, the transceiver module 1402 is further configured to receive fifth indication information sent by the network device, wherein the fifth indication information is used to indicate at least one of the designated second reference signals.

[0313] Optionally, the processing module 1401 is further configured to determine the second reference signal that meets the specified conditions as the specified second reference signal;

[0314] The transceiver module 1402 is further configured to send a sixth indication information to the network device, wherein the sixth indication information is used to indicate the at least one designated second reference signal.

[0315] Optionally, the processing module 1401 is further configured to:

[0316] In response to the fact that the time delay corresponding to the candidate second reference signal is less than the time delay corresponding to each of the other second reference signals, it is determined that the candidate second reference signal satisfies the specified condition; or...

[0317] In response to the fact that the time delay corresponding to the candidate second reference signal in any second reference signal group is less than the time delay corresponding to each of the other second reference signals in the same reference signal group, it is determined that the candidate second reference signal in the same reference signal group satisfies the specified condition.

[0318] In this disclosure, the terminal device can receive at least one and / or at least one pair of TCI states sent by the network device for joint transmission. Thus, the terminal device can accurately determine which DMRS port in the joint transmission is quasi-co-located with the first reference signal indicated by which TCI state, thereby reliably realizing multi-TRP-based joint transmission and improving the transmission performance of multi-TRP-based CJT.

[0319] Optionally, the communication device 1400 is located on the network equipment side, wherein:

[0320] The transceiver module 1402 is used to send first indication information to the terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission.

[0321] Optionally, the first indication information includes a first media access control (MAC) control unit (CE), wherein the first MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to a code point in the TCI field of the downlink control information (DCI).

[0322] Optionally, the first indication information includes a second MAC CE and a DCI, wherein the second MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to each of the multiple code points in the TCI field of the DCI, and the DCI is used to indicate one of the multiple code points.

[0323] Optionally, the transceiver module 1402 described above is also used for:

[0324] Send a second indication message to the terminal device, wherein the second indication message is used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one demodulation reference signal DMRS port, or the second indication message is used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one CDM group.

[0325] Optionally, the transceiver module 1402 described above is also used for:

[0326] Send a third indication message to the terminal device, wherein the third indication message is used to indicate a second reference signal corresponding to each Channel Measurement Resource (CMR) or Channel State Information Reference Signal (CSI) RS port group, or a second reference signal corresponding to each CMR group or CSI-RS port group set, wherein a CMR group contains at least one CMR, and a CSI-RS port group set contains at least one CSI-RS port group, wherein the second reference signal is different from the first reference signal of the TCI status indication;

[0327] The terminal device receives a fourth indication message, wherein the fourth indication message is used to indicate transmission parameters corresponding to at least one second reference signal.

[0328] Optionally, the fourth indication information is indicated by a sounding reference signal (SRS), or the fourth indication information is included in the channel state information (CSI).

[0329] Optionally, the fourth indication information includes the absolute value of the transmission parameter corresponding to each second reference signal; or,

[0330] The fourth indication information includes the relative value of at least one transmission parameter corresponding to the second reference signal relative to the transmission parameter corresponding to the specified second reference signal.

[0331] Optionally, the transceiver module 1402 described above is also used for:

[0332] Send a fifth indication message to the terminal device, wherein the fifth indication message is used to indicate at least one of the designated second reference signals; or,

[0333] The terminal device receives a sixth indication message, wherein the sixth indication message is used to indicate the at least one designated second reference signal.

[0334] In this disclosure, the network device can send at least one and / or at least one pair of TCI states to the terminal device for joint transmission. Thus, the terminal device can accurately determine which DMRS port of the joint transmission is quasi-co-located with the first reference signal indicated by which TCI state, thereby reliably realizing multi-TRP-based joint transmission and improving the transmission performance of multi-TRP-based CJT.

[0335] Please see Figure 15 , Figure 15This is a schematic diagram of another communication device 1500 provided in this embodiment. The communication device 1500 can be a terminal device, a network device, a chip, chip system, or processor that supports the terminal device in implementing the above methods, or a chip, chip system, or processor that supports the network device in implementing the above methods. This device can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0336] The communication device 1500 may include one or more processors 1501. The processor 1501 may be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control the communication device (e.g., base station, baseband chip, terminal equipment, terminal equipment chip, DU or CU, etc.), execute computer programs, and process data from the computer programs.

[0337] Optionally, the communication device 1500 may further include one or more memories 1502, on which a computer program 1104 may be stored. The processor 1501 executes the computer program 1504 to cause the communication device 1500 to perform the method described in the above method embodiments. Optionally, the memory 1502 may also store data. The communication device 15100 and the memory 1502 may be provided separately or integrated together.

[0338] Optionally, the communication device 1500 may also include a transceiver 1505 and an antenna 1506. The transceiver 1505 may be referred to as a transceiver unit, transceiver, or transceiver circuit, etc., and is used to implement the transmission and reception functions. The transceiver 1505 may include a receiver and a transmitter. The receiver may be referred to as a receiver or receiving circuit, etc., and is used to implement the receiving function; the transmitter may be referred to as a transmitter or transmitting circuit, etc., and is used to implement the transmitting function.

[0339] Optionally, the communication device 1500 may further include one or more interface circuits 11507. The interface circuit 1507 is used to receive code instructions and transmit them to the processor 1501. The processor 1501 executes the code instructions to cause the communication device 1500 to perform the methods described in the above method embodiments.

[0340] Communication device 1500 is a terminal device: processor 1501 is used to execute... Figure 3 Step 302 in the middle, Figure 4 Step 403 in the middle, Figure 5 Step 503, etc.; transceiver 1505, used for execution Figure 2 Step 201 in the middle, Figure 3 Step 301 in the middle, Figure 4Steps 401, 402, etc.

[0341] Communication device 1500 is a network device: transceiver 1505, used for performing... Figure 10 Step 1001 in the middle, Figure 11 Steps 1001 and 1102, etc.

[0342] In one implementation, the processor 1501 may include a transceiver for implementing receive and transmit functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing receive and transmit functions may be separate or integrated. The aforementioned transceiver circuit, interface, or interface circuit can be used for reading and writing code / data, or it can be used for transmitting or relaying signals.

[0343] In one implementation, processor 1501 may store computer program 1503, which runs on processor 1501 and causes communication device 1500 to perform the methods described in the above method embodiments. Computer program 1503 may be embedded in processor 1501; in this case, processor 1501 may be implemented in hardware.

[0344] In one implementation, the communication device 1500 may include circuitry capable of performing the functions of transmitting, receiving, or communicating as described in the foregoing method embodiments. The processor and transceiver described in this disclosure can be implemented on integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application-specific integrated circuits (ASICs), printed circuit boards (PCBs), electronic devices, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal-oxide-semiconductor (CMOS), n-metal-oxide-semiconductor (NMOS), positive-channel metal-oxide-semiconductor (PMOS), bipolar junction transistors (BJTs), bipolar CMOS (BiCMOS), silicon-germanium (SiGe), gallium arsenide (GaAs), etc.

[0345] The communication device described in the above embodiments may be a remote terminal device, but the scope of the communication device described in this disclosure is not limited thereto, and the structure of the communication device may vary. Figure 11 The communication device may be a standalone device or part of a larger device. For example, the communication device may be:

[0346] (1) Independent integrated circuit IC, or chip, or chip system or subsystem;

[0347] (2) A collection of one or more ICs, optionally including storage components for storing data and computer programs;

[0348] (3) ASIC, such as modem;

[0349] (4) Modules that can be embedded in other devices;

[0350] (5) Receivers, terminal equipment, smart terminal equipment, cellular phones, wireless equipment, handheld devices, mobile units, vehicle-mounted equipment, network equipment, cloud equipment, artificial intelligence equipment, etc.

[0351] (6) Others, etc.

[0352] For cases where the communication device can be a chip or a chip system, please refer to [link / reference]. Figure 16 The diagram shows the structure of the chip. Figure 16 The chip shown includes a processor 1601 and an interface 1603. There can be one or more processors 1601, and multiple interfaces 1603.

[0353] Regarding the case where the chip is used to implement the functions of the terminal device in the embodiments of this disclosure:

[0354] Processor 1601, used to execute Figure 3 Step 302 in the process, or execute Figure 4 Steps such as step 403, etc.

[0355] Optionally, the chip also includes a memory 1603, which is used to store necessary computer programs and data.

[0356] Those skilled in the art will also understand that the various illustrative logical blocks and steps listed in the embodiments of this disclosure can be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented in hardware or software depends on the specific application and the overall system design requirements. Those skilled in the art can implement the described functionality using various methods for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of this disclosure.

[0357] This disclosure also provides a readable storage medium having instructions stored thereon that, when executed by a computer, implement the functions of any of the above method embodiments.

[0358] This disclosure also provides a computer program product that, when executed by a computer, implements the functions of any of the above method embodiments.

[0359] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program can be transferred from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0360] Those skilled in the art will understand that the various numerical designations such as "first," "second," etc., used in this disclosure are merely for the convenience of description and are not intended to limit the scope of the embodiments of this disclosure, nor do they indicate the order of events.

[0361] At least one of the features described in this disclosure can also be described as one or more, and multiple features can be two, three, four or more, and this disclosure does not impose any limitations. In the embodiments of this disclosure, for a technical feature, the technical features in that technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", etc., and there is no sequential order or size order among the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0362] The correspondences shown in the tables of this disclosure can be configured or predefined. The values ​​of the information in each table are merely examples and can be configured to other values; this disclosure is not limiting. When configuring the correspondences between information and parameters, it is not necessarily required to configure all the correspondences shown in each table. For example, the correspondences shown in some rows of the tables in this disclosure may not be configured. Furthermore, appropriate modifications and adjustments can be made based on the above tables, such as splitting, merging, etc. The names of the parameters shown in the headers of the above tables can also use other names that the communication device can understand, and the values ​​or representations of the parameters can also be other values ​​or representations that the communication device can understand. In the implementation of the above tables, other data structures can also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables, or hash tables, etc.

[0363] The predefined terms in this disclosure can be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

[0364] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0365] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0366] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A method for indicating transmission configuration indication status, characterized in that, The method, executed by a terminal device, includes: The network device receives first indication information, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission, the pair of TCI states being a downlink TCI state and an uplink TCI state. The system receives second indication information sent by the network device. The second indication information is used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one demodulation reference signal (DMRS) port, or the second indication information is used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one code division multiplexing (CDM) group; or, based on the default mapping relationship, the system determines the mapping relationship between the at least one and / or at least one pair of TCI states and at least one DMRS port, or determines the mapping relationship between the at least one and / or at least one pair of TCI states and at least one CDM group. All transmission parameters corresponding to the first reference signal indicating the first TCI state in at least one and / or at least one pair of TCI states are used for the corresponding first DMRS port or first CDM group.

2. The method as described in claim 1, characterized in that, The transmission parameters include at least one of the following: Average delay, delay spread, Doppler shift, Doppler spread, and spatial reception parameters.

3. The method as described in claim 1, characterized in that, The method further includes: Based on the first reference signal indicated by the joint TCI state or downlink TCI state in at least one and / or at least one pair of TCI states, the transmission parameters of the DMRS port of the Physical Downlink Shared Channel (PDSCH) are determined; or, The transmission parameters of the DMRS port of the Physical Uplink Shared Channel (PUSCH) are determined based on the first reference signal indicated by the joint TCI state or uplink TCI state in at least one and / or at least one pair of TCI states.

4. The method as described in claim 1, characterized in that, The first indication information includes a first media access control (MAC) control unit (CE), wherein the first MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to a code point in the TCI field of the downlink control information (DCI).

5. The method as described in claim 1, characterized in that, The first indication information includes a second MAC CE and a DCI, wherein the second MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to each of the multiple code points in the TCI field of the DCI, and the DCI is used to indicate one of the multiple code points.

6. The method as described in claim 1, characterized in that, The method further includes: Determine the remaining transmission parameters, excluding at least one specified transmission parameter, corresponding to the first reference signal indicating the second TCI state in at least one and / or at least one pair of TCI states, for the corresponding second DMRS port or second CDM group; Determine at least one specified transmission parameter corresponding to the first reference signal indicating the specified TCI status, for the second DMRS port or the second CDM group.

7. The method as described in claim 6, characterized in that, The specified TCI state is any one of the following: The TCI state identifier is the smallest TCI state, the TCI state indicated by the low bit of MAC CE, and the first TCI state indicated by the first indication information.

8. The method according to any one of claims 1-5, characterized in that, Also includes: The third indication information sent by the network device is used to indicate the second reference signal corresponding to each Channel Measurement Resource (CMR) or Channel State Information Reference Signal (CSI) RS port group, or the second reference signal corresponding to each CMR group or CSI-RS port group set. A CMR group contains at least one CMR, and a CSI RS port group set contains at least one CSI RS port group. Determine the transmission parameters corresponding to each of the second reference signals; Send a fourth indication message to the network device, wherein the fourth indication message is used to indicate transmission parameters corresponding to at least one second reference signal.

9. The method as described in claim 8, characterized in that, The fourth indication information is indicated by the sounding reference signal (SRS) or is included in the channel state information (CSI).

10. The method as described in claim 8, characterized in that, The fourth indication information includes the absolute value of the transmission parameter corresponding to each second reference signal; or, The fourth indication information includes the relative value of at least one transmission parameter corresponding to the second reference signal relative to the transmission parameter corresponding to the specified second reference signal.

11. The method as described in claim 10, characterized in that, Also includes: The network device receives a fifth indication message, wherein the fifth indication message is used to indicate at least one of the designated second reference signals.

12. The method as described in claim 11, characterized in that, Also includes: The second reference signal that meets the specified conditions is determined as the specified second reference signal; A sixth indication message is sent to the network device, wherein the sixth indication message is used to indicate the at least one designated second reference signal.

13. The method as described in claim 12, characterized in that, Also includes: In response to the fact that the time delay corresponding to the candidate second reference signal is less than the time delay corresponding to each of the other second reference signals, it is determined that the candidate second reference signal satisfies the specified condition; or, In response to the fact that the time delay corresponding to the candidate second reference signal in any second reference signal group is less than the time delay corresponding to each of the other second reference signals in any second reference signal group, it is determined that the candidate second reference signal in any second reference signal group satisfies the specified condition.

14. A method for indicating a transmission configuration indication status, characterized in that, Performed by a network device, the method includes: Send first indication information to the terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission, the pair of TCI states being a downlink TCI state and an uplink TCI state; Send a second indication message to the terminal device, wherein the second indication message is used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one demodulation reference signal DMRS port, or the second indication message is used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one CDM group, wherein all transmission parameters corresponding to the first reference signal indicated by the first TCI state in the at least one and / or at least one pair of TCI states are used for the corresponding first DMRS port or first CDM group.

15. The method as described in claim 14, characterized in that, The first indication information includes a first media access control (MAC) control unit (CE), wherein the first MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to a code point in the TCI field of the downlink control information (DCI).

16. The method as described in claim 14, characterized in that, The first indication information includes a second MAC CE and a DCI, wherein the second MAC CE is used to activate at least one and / or at least one pair of TCI states corresponding to each of the multiple code points in the TCI field of the DCI, and the DCI is used to indicate one of the multiple code points.

17. The method according to any one of claims 14-16, characterized in that, Also includes: Send a third indication message to the terminal device, wherein the third indication message is used to indicate a second reference signal corresponding to each Channel Measurement Resource (CMR) or Channel State Information Reference Signal (CSI) RS port group, or a second reference signal corresponding to each CMR group or CSI-RS port group set, wherein a CMR group contains at least one CMR, and a CSI-RS port group set contains at least one CSI-RS port group, wherein the second reference signal is different from the first reference signal of the TCI status indication; The terminal device receives a fourth indication message, wherein the fourth indication message is used to indicate transmission parameters corresponding to at least one second reference signal.

18. The method as described in claim 17, characterized in that, The fourth indication information is indicated by the sounding reference signal (SRS) or is included in the channel state information (CSI).

19. The method as described in claim 17, characterized in that, The fourth indication information includes the absolute value of the transmission parameter corresponding to each second reference signal; or, The fourth indication information includes the relative value of at least one transmission parameter corresponding to the second reference signal relative to the transmission parameter corresponding to the specified second reference signal.

20. The method as described in claim 19, characterized in that, Also includes: Send a fifth indication message to the terminal device, wherein the fifth indication message is used to indicate at least one of the designated second reference signals; or, The terminal device receives a sixth indication message, wherein the sixth indication message is used to indicate the at least one designated second reference signal.

21. A communication device, characterized in that, The device, applied to the terminal device side, includes: The transceiver module is configured to receive first indication information sent by the network device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission, the pair of TCI states being a downlink TCI state and an uplink TCI state. The transceiver module is further configured to receive second indication information sent by the network device, the second indication information being used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one demodulation reference signal (DMRS) port, or the second indication information being used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one code division multiplexing (CDM) group; or, based on a default mapping relationship, determining the mapping relationship between the at least one and / or at least one pair of TCI states and at least one DMRS port, or determining the mapping relationship between the at least one and / or at least one pair of TCI states and at least one CDM group; The processing module is configured to determine that all transmission parameters corresponding to the first reference signal of the first TCI state indication in at least one and / or at least one pair of TCI states are used for the corresponding first DMRS port or first CDM group.

22. A communication device, characterized in that, The device, applied to the network equipment side, includes: A transceiver module is configured to send first indication information to a terminal device, wherein the first indication information is used to indicate at least one and / or at least one pair of Transmission Configuration Indicator (TCI) states for joint transmission, the pair of TCI states being a downlink TCI state and an uplink TCI state. The transceiver module is further configured to send second indication information to the terminal device, wherein the second indication information is used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one demodulation reference signal DMRS port, or the second indication information is used to indicate the mapping relationship between the at least one and / or at least one pair of TCI states and at least one CDM group, wherein all transmission parameters corresponding to the first reference signal indicated by the first TCI state in the at least one and / or at least one pair of TCI states are used for the corresponding first DMRS port or first CDM group.

23. A communication device, characterized in that, The device includes a processor and a memory, the memory storing a computer program, the processor executing the computer program stored in the memory to cause the device to perform the method as claimed in any one of claims 1 to 13, or to perform the method as claimed in any one of claims 14 to 20.

24. A computer-readable storage medium for storing instructions that, when executed, cause the method of any one of claims 1 to 13 to be implemented, or to perform the method of any one of claims 14 to 20.

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