Transmission method and related apparatus

Abstract

The present application discloses a transmission method and a related apparatus. The method comprises: a terminal device receives first instruction information, wherein the first instruction information is used for instructing the terminal device to switch from a first communication mode to a second communication mode, the first communication mode indicates that the terminal device separately uses a plurality of beams to communicate with a plurality of transmission nodes, and the second communication mode indicates that the terminal device uses a single beam to communicate with a single transmission node; the terminal device determines a first beam on the basis of the first instruction information; and the terminal device measures or transmits a reference signal on the basis of the first beam, or transmits a channel. In this way, the waste of resources can be reduced, and the overhead is saved.

Description

A transmission method and related device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 11, 2023, with application number 202311021451.9 and application name “A Transmission Method and Related Devices”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a transmission method and related devices. Background Art

[0003] In a communication system, multiple transmission nodes are allowed to communicate with a single terminal device simultaneously. Multiple transmission nodes need to indicate multiple beams to the terminal device, with each node using a single beam to communicate with the terminal device. If a terminal device is instructed to use a single beam to communicate with a single transmission node, but still communicates using the beam information corresponding to the multiple transmission nodes, resources will be wasted.

[0004] Summary of the Invention

[0005] The present application provides a transmission method and related devices, which can reduce waste of resources and save costs.

[0006] In a first aspect, the present application provides a transmission method that can be applied in the field of communication technology, the method comprising:

[0007] First, the terminal device receives first indication information, wherein the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode, the first communication mode instructs the terminal device to use multiple beams to communicate with multiple transmission nodes respectively, and the second communication mode instructs the terminal device to use a single beam to communicate with a single transmission node; then, the terminal device determines the first beam according to the first indication information; finally, the terminal device measures or transmits a reference signal or transmits a channel according to the first beam.

[0008] In the present application, after receiving the first indication information sent by the network device, the terminal device can switch from the first communication mode to the second communication mode according to the indication of the first indication information, and transmit the reference signal or channel based on the first beam associated with a single transmission node, thereby reducing resource waste and saving overhead. In addition, after switching from the first communication mode to the second communication mode, compared to the transmission of the reference signal or channel only after reconfiguring the associated beam information through the transmission node, the reference signal or channel is transmitted directly based on the beam information associated with a single transmission node, omitting the beam information reconfiguration process and further reducing the transmission delay.

[0009] In one possible implementation, the reference signal includes a channel status information reference signal (CSI-RS), multiple beams are respectively associated with multiple CSI-RS sets, and each CSI-RS set includes multiple CSI-RSs.

[0010] Before the terminal device receives the first indication information, the terminal device receives first configuration information, where the first configuration information instructs the terminal device to report second measurement results of K groups of CSI-RSs, where K is greater than or equal to 0, and the second measurement results of each group of CSI-RSs include at least two CSI-RSs, where the at least two CSI-RSs are from different CSI-RS sets;

[0011] After the terminal device receives the first indication information and determines the first beam according to the first indication information, the terminal device determines a first CSI-RS set associated with the first beam from the multiple CSI-RS sets; the terminal device measures only the first CSI-RS set to obtain a first measurement result;

[0012] After the terminal device switches from the first communication mode to the second communication mode, the terminal device only reports the first measurement result, and the first measurement result includes the second measurement results of M CSI-RSs, and the second measurement results of the M CSI-RSs all come from the first CSI-RS set, and M is greater than or equal to 0.

[0013] In this implementation, before the terminal device receives the first indication information, the terminal device will receive the first configuration information. The first configuration information indicates the content that the terminal device is instructed to report when it operates in the first communication mode. When the terminal device operates in the first communication mode, the terminal device can communicate with the network device through multiple transmission nodes. Therefore, the first configuration information indicates that the second measurement result reported by the terminal device includes the measurement results of the CSI-RS from different CSI-RS sets. The first configuration information indicates that the terminal device reports the second measurement result of the CSI-RS from different CSI-RS sets. After the terminal device switches from the first communication mode to the second communication mode, compared to still communicating according to the beam information configured in the communication mode of multiple transmission nodes, the terminal device only reports the second measurement result of the CSI-RS in the first CSI-RS set associated with the first beam, thereby saving overhead and reducing waste of resources.

[0014] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, the CSI-RS set includes multiple CSI-RS groups and one or more CSI-RS resource pairs, each CSI-RS group includes multiple CSI-RSs, the CSI-RSs in the multiple CSI-RS groups are respectively associated with multiple beams, and the CSI-RS resource pair includes one CSI-RS from each CSI-RS group.

[0015] Before the terminal device receives the first indication information, the terminal device receives second configuration information, where the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of a CSI-RS resource pair;

[0016] After the terminal device receives the first indication information and determines the first beam based on the first indication information, the terminal device determines the CSI-RS associated with the first beam from the CSI-RS set; the terminal device only measures the CSI-RS associated with the first beam to obtain a third measurement result.

[0017] After the terminal device switches from the first communication mode to the second communication mode, the terminal device only reports the third measurement result.

[0018] In this implementation, for a CSI-RS set including multiple CSI-RS groups and one or more CSI-RS resource pairs, the second configuration information indicates that the terminal device reports a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information indicates that the terminal device reports a fifth measurement result of one CSI-RS resource pair. After the terminal device switches from the first communication mode to the second communication mode, compared to still communicating according to the beam information configured in the multi-transmission node communication mode, the terminal device only reports the second measurement result of the CSI-RS associated with the first beam, thereby saving overhead and reducing waste of resources.

[0019] In one possible implementation, the reference signal includes a sounding reference signal (SRS), multiple beams are associated with multiple SRS sets, and the terminal device transmits the reference signal according to the first beam, including:

[0020] The terminal device determines an SRS set associated with the first beam from a plurality of SRS sets;

[0021] The terminal device only transmits the set of SRS associated with the first beam.

[0022] In this implementation, after determining the first beam according to the first indication information, the terminal device only sends the set of SRS associated with the first beam, and does not send the set of SRS associated with other beams, thereby reducing resource waste.

[0023] In one possible implementation, the channel includes a physical downlink shared channel (PDSCH) scheduled in a first downlink control information (DCI) format, and the terminal device transmits the channel according to the first beam, including:

[0024] The terminal device receives a first DCI, where the first DCI is used to schedule a PDSCH;

[0025] The terminal device uses the first beam to receive the PDSCH scheduled by the first DCI format.

[0026] In this implementation, after the terminal device determines the first beam according to the first indication information, the terminal device receives the first DCI for scheduling PDSCH, and only uses the first beam to receive the PDSCH scheduled in the first DCI format, and does not use other beams to receive the PDSCH scheduled in the first DCI format, so that the terminal device operates in the second communication mode according to the information indicated by the network device, ensuring normal communication between the terminal device and the network device and reducing resource waste.

[0027] One possible implementation further includes:

[0028] The first DCI includes a first field, where the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive the PDSCH;

[0029] The terminal device uses the first beam to receive the PDSCH scheduled by the first DCI format.

[0030] In this implementation, after the terminal device receives the first DCI for scheduling PDSCH, if the first DCI includes a first field indicating that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive PDSCH, the terminal device can use the first beam to receive the PDSCH scheduled by the first DCI format according to the content indicated by the first field, and communicate with the network device according to the above rules.

[0031] In one possible implementation, the channel includes a physical uplink shared channel (PUSCH) scheduled in a second downlink control information DCI format, and the terminal device transmits the channel according to the first beam, including:

[0032] The terminal device receives a second DCI, where the second DCI is used to schedule a PUSCH;

[0033] The terminal device uses the first beam to send the PUSCH scheduled by the second DCI format.

[0034] In this implementation, after the terminal device determines the first beam according to the first indication information, the terminal device receives the second DCI for scheduling PUSCH, and only uses the first beam to receive the PUSCH scheduled in the second DCI format, and does not use other beams to receive the PUSCH scheduled in the second DCI format, so that the terminal device operates in the second communication mode according to the information indicated by the network device, ensuring normal communication between the terminal device and the network device and reducing resource waste.

[0035] One possible implementation further includes:

[0036] The second DCI includes a second field, where the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send the PUSCH;

[0037] The terminal device uses the first beam to send the PUSCH scheduled by the second DCI format.

[0038] In this implementation, after the terminal device receives the second DCI for scheduling PUSCH, if the second DCI includes a second field indicating that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive PUSCH, the terminal device can use the first beam to receive the PUSCH scheduled by the second DCI format according to the content indicated by the second field, and communicate with the network device according to the above rules.

[0039] In one possible implementation, the first indication information includes a media / medium access control element (MAC CE).

[0040] In this implementation, the terminal device may receive a MAC CE signaling sent by the network device, where the MAC CE signaling is used to instruct the terminal device to switch from the first communication mode to the second communication mode.

[0041] In one possible implementation, the first indication information further includes third downlink control information (DCI), where the third DCI instructs the terminal device to communicate with a single transmission node using the first beam. The terminal device determines the first beam based on the first indication information, including:

[0042] The terminal device switches from the first communication mode to the second communication mode according to the MAC CE;

[0043] The terminal device determines the first beam based on the third DCI.

[0044] In this implementation method, after receiving the MAC CE instruction sent by the network device, the terminal device will further receive the third DCI sent by the network device, and determine that the terminal device uses the first beam to communicate with a single transmission node based on the information indicated in the third DCI.

[0045] In one possible implementation, the multiple transmission nodes include a first transmission node and a second transmission node, the first transmission node is associated with a first timing advance (TA), and the first indication information is used to activate one or more beams associated with the first transmission node, and the one or more beams associated with the first transmission node are all associated with the first TA.

[0046] In one possible implementation, the second transmission node is associated with the second TA, and the method further includes:

[0047] The terminal device stops the timer of the second TA;

[0048] The terminal device stops the random access channel (RACH) process with the second TA;

[0049] The terminal device clears the transmission of the uplink physical channel or uplink reference signal with the second TA;

[0050] The terminal device clears the hybrid automatic repeat request (HARQ) cache corresponding to the second TA.

[0051] In this implementation, after the terminal device receives the first indication information and switches from the first communication mode to the second communication mode, the terminal device stops maintaining the TA associated with the inactivated beam. The specific operations are as described above to reduce the resource usage overhead of the TA associated with the inactivated beam.

[0052] In one possible implementation, a condition for the terminal device to switch from the first communication mode to the second communication mode is:

[0053] After the first time period, the terminal device receives the first indication information and feeds back confirmation information to the network device.

[0054] In this implementation method, after the terminal device receives the first indication information and switches from the first communication mode to the second communication mode according to the content indicated by the first indication information, it also needs to feedback confirmation information to the network device so that the network device can confirm that the terminal device has switched to the second communication mode and use the corresponding communication rules in the second communication mode to communicate with the terminal device to ensure normal communication of the network.

[0055] In one possible implementation, the first communication mode is a multiple transmission and reception point mode (multiple transmission and reception point or multiple transmit / receive point, MTRP), and the second communication mode is a single transmission and reception point mode (single transmission and reception point or single transmit / receive point, STRP).

[0056] In a second aspect, the present application provides a transmission method, characterized by comprising:

[0057] Sending first indication information to the terminal device, where the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode, where the first communication mode instructs the terminal device to communicate with multiple transmission nodes using multiple beams respectively, and the second communication mode instructs the terminal device to communicate with a single transmission node using a single beam;

[0058] Receive measurement results of a reference signal from a terminal device, or transmit a reference signal or channel.

[0059] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, multiple beams are respectively associated with multiple CSI-RS sets, each CSI-RS set includes multiple CSI-RSs, and before sending the first indication information to the terminal device, the following is further included:

[0060] Sending first configuration information to the terminal device, where the first configuration information instructs the terminal device to report second measurement results of K groups of CSI-RSs, where K is greater than or equal to 0, and the second measurement result of each group of CSI-RSs includes at least two CSI-RSs, where the at least two CSI-RSs are from different CSI-RS sets;

[0061] After sending the first indication information to the terminal device, receiving a reference signal measurement result from the terminal device includes:

[0062] A first measurement result is received from a terminal device, where the first measurement result includes second measurement results of M CSI-RSs, where the second measurement results of the M CSI-RSs are all from a first CSI-RS set, and M is greater than or equal to 0.

[0063] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, the CSI-RS set includes multiple CSI-RS groups and one or more CSI-RS resource pairs, each CSI-RS group includes multiple CSI-RSs, the CSI-RSs in the multiple CSI-RS groups are respectively associated with multiple beams, and the CSI-RS resource pair includes one CSI-RS from each CSI-RS group. Before sending the first indication information to the terminal device, the following is further included:

[0064] Sending second configuration information to the terminal device, where the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of one CSI-RS resource pair;

[0065] After sending the first indication information to the terminal device, receiving a reference signal measurement result from the terminal device includes:

[0066] A third measurement result is received from the terminal device, where the third measurement result is a result of the terminal device measuring only the CSI-RS associated with the first beam.

[0067] In one possible implementation, the reference signal includes a sounding reference signal (SRS), multiple beams are associated with multiple SRS sets, and the reference signal is transmitted, including:

[0068] A set of SRSs associated with a first beam is received.

[0069] In one possible implementation, the channel includes a physical downlink shared channel PDSCH scheduled in a first downlink control information DCI format, and transmitting the channel includes:

[0070] Sending a first DCI to the terminal device, where the first DCI is used to schedule the PDSCH;

[0071] Send a PDSCH scheduled in the first DCI format to the terminal device.

[0072] One possible implementation further includes:

[0073] The first DCI includes a first field, where the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive the PDSCH;

[0074] Send a PDSCH scheduled in the first DCI format to the terminal device.

[0075] In one possible implementation, the channel includes a physical uplink shared channel PUSCH scheduled in a second downlink control information DCI format, and transmitting the channel includes:

[0076] Sending a second DCI to the terminal device, where the second DCI is used to schedule the PUSCH;

[0077] A PUSCH scheduled by the second DCI format is received.

[0078] One possible implementation further includes:

[0079] The second DCI includes a second field, where the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send the PUSCH;

[0080] A PUSCH scheduled by the second DCI format is received.

[0081] In a possible implementation, the first indication information includes a media access control element MAC CE.

[0082] In one possible implementation, the first indication information also includes third downlink control information DCI, and the third DCI indicates that the terminal device uses the first beam to communicate with a single transmission node.

[0083] In one possible implementation, multiple network devices include a first network device, the first network device is associated with a first timing advance TA, the first indication information is used to activate one or several beams associated with the first network device, and the one or several beams associated with the first network device are all associated with the first TA.

[0084] In a possible implementation, the first indication information takes effect when: after a first time period of receiving confirmation information.

[0085] In a possible implementation, the first communication mode is a multiple receiving transmission point mode MTRP, and the second communication mode is a single receiving transmission point mode STRP.

[0086] In a third aspect, the present application provides a communication device. The beneficial effects can be found in the description of the first aspect and will not be repeated here. The communication device has the function of implementing the behavior in the method example of the first aspect. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In one possible design, the communication device includes:

[0087] a receiving module, configured to receive first indication information, where the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode, where the first communication mode instructs the terminal device to communicate with multiple transmission nodes using multiple beams respectively, and the second communication mode instructs the terminal device to communicate with a single transmission node using a single beam;

[0088] a processing module, configured to determine a first beam according to the first indication information;

[0089] A transmission module is used to measure or transmit a reference signal according to the first beam, or to transmit a channel.

[0090] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, multiple beams are respectively associated with multiple CSI-RS sets, and each CSI-RS set includes multiple CSI-RSs.

[0091] Before the terminal device receives the first indication information, the terminal device receives first configuration information, where the first configuration information instructs the terminal device to report second measurement results of K groups of CSI-RSs, where K is greater than or equal to 0, and the second measurement results of each group of CSI-RSs include at least two CSI-RSs, where the at least two CSI-RSs are from different CSI-RS sets;

[0092] After the terminal device receives the first indication information and determines the first beam according to the first indication information, the transmission module is further configured to: the terminal device determines a first CSI-RS set associated with the first beam from the multiple CSI-RS sets; the terminal device measures only the first CSI-RS set to obtain a first measurement result;

[0093] After the terminal device switches from the first communication mode to the second communication mode, the terminal device only reports the first measurement result, and the first measurement result includes the second measurement results of M CSI-RSs, and the second measurement results of the M CSI-RSs all come from the first CSI-RS set, and M is greater than or equal to 0.

[0094] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, the CSI-RS set includes multiple CSI-RS groups and one or more CSI-RS resource pairs, each CSI-RS group includes multiple CSI-RSs, the CSI-RSs in the multiple CSI-RS groups are respectively associated with multiple beams, and the CSI-RS resource pair includes one CSI-RS from each CSI-RS group.

[0095] Before the terminal device receives the first indication information, the terminal device receives second configuration information, where the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of a CSI-RS resource pair;

[0096] After the terminal device receives the first indication information and determines the first beam based on the first indication information, the transmission module is also used to: the terminal device determines the CSI-RS associated with the first beam from the CSI-RS set; the terminal device only measures the CSI-RS associated with the first beam to obtain a third measurement result.

[0097] After the terminal device switches from the first communication mode to the second communication mode, the terminal device only reports the third measurement result.

[0098] In one possible implementation, the reference signal includes a sounding reference signal (SRS), the multiple beams are associated with multiple SRS sets, and the transmission module is further configured to:

[0099] The terminal device determines an SRS set associated with the first beam from a plurality of SRS sets;

[0100] The terminal device only transmits the set of SRS associated with the first beam.

[0101] In one possible implementation, the channel includes a physical downlink shared channel PDSCH scheduled in a first downlink control information DCI format, and the transmission module is further configured to:

[0102] The terminal device receives a first DCI, where the first DCI is used to schedule a PDSCH;

[0103] The terminal device uses the first beam to receive the PDSCH scheduled by the first DCI format.

[0104] One possible implementation further includes:

[0105] The first DCI includes a first field, where the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive the PDSCH;

[0106] The terminal device uses the first beam to receive the PDSCH scheduled by the first DCI format.

[0107] In one possible implementation, the channel includes a physical uplink shared channel (PUSCH) scheduled in a second downlink control information (DCI) format, and the terminal device transmits the channel according to the first beam, including:

[0108] The terminal device receives a second DCI, where the second DCI is used to schedule a PUSCH;

[0109] The terminal device uses the first beam to send the PUSCH scheduled by the second DCI format.

[0110] One possible implementation further includes:

[0111] The second DCI includes a second field, where the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send the PUSCH;

[0112] The terminal device uses the first beam to send the PUSCH scheduled by the second DCI format.

[0113] In a possible implementation, the first indication information includes a media access control element MAC CE.

[0114] In one possible implementation, the first indication information further includes third downlink control information (DCI), where the third DCI instructs the terminal device to communicate with a single transmission node using the first beam. The terminal device determines the first beam based on the first indication information, including:

[0115] The terminal device switches from the first communication mode to the second communication mode according to the MAC CE;

[0116] The terminal device determines the first beam based on the third DCI.

[0117] In one possible implementation, multiple network devices include a first network device and a second network device, the first network device is associated with a first timing advance TA, the first indication information is used to activate one or several beams associated with the first network device, and the one or several beams associated with the first network device are all associated with the first TA.

[0118] In one possible implementation, the second network device is associated with the second TA, further comprising:

[0119] The terminal device stops the timer of the second TA;

[0120] The terminal device stops the random access channel RACH process with the second TA;

[0121] The terminal device clears the transmission of the uplink physical channel or uplink reference signal with the second TA;

[0122] The terminal device clears the hybrid automatic repeat request HARQ cache corresponding to the second TA.

[0123] In one possible implementation, a condition for the terminal device to switch from the first communication mode to the second communication mode is:

[0124] After the first time period, the terminal device receives the first indication information and feeds back confirmation information to the network device.

[0125] In a possible implementation, the first communication mode is a multiple receiving transmission point mode MTRP, and the second communication mode is a single receiving transmission point mode STRP.

[0126] In a fourth aspect, the present application provides a communication device. The beneficial effects can be found in the description of the first aspect and will not be repeated here. The communication device has the function of implementing the behavior in the method example of the first aspect. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. In one possible design, the communication device includes:

[0127] a sending module, configured to send first indication information to a terminal device, where the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode, where the first communication mode instructs the terminal device to communicate with multiple transmission nodes using multiple beams respectively, and the second communication mode instructs the terminal device to communicate with a single transmission node using a single beam;

[0128] The transmission module is used to receive the measurement result of the reference signal from the terminal device, or to transmit the reference signal or channel.

[0129] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, multiple beams are respectively associated with multiple CSI-RS sets, each CSI-RS set includes multiple CSI-RSs, and before sending the first indication information to the terminal device, the following is further included:

[0130] Sending first configuration information to the terminal device, where the first configuration information instructs the terminal device to report second measurement results of K groups of CSI-RSs, where K is greater than or equal to 0, and the second measurement result of each group of CSI-RSs includes at least two CSI-RSs, where the at least two CSI-RSs are from different CSI-RS sets;

[0131] After sending the first indication information to the terminal device, the transmission module is further configured to:

[0132] A first measurement result is received from a terminal device, where the first measurement result includes second measurement results of M CSI-RSs, where the second measurement results of the M CSI-RSs are all from a first CSI-RS set, and M is greater than or equal to 0.

[0133] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, the CSI-RS set includes multiple CSI-RS groups and one or more CSI-RS resource pairs, each CSI-RS group includes multiple CSI-RSs, the CSI-RSs in the multiple CSI-RS groups are respectively associated with multiple beams, and the CSI-RS resource pair includes one CSI-RS from each CSI-RS group. Before sending the first indication information to the terminal device, the following is further included:

[0134] Sending second configuration information to the terminal device, where the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of one CSI-RS resource pair;

[0135] After sending the first indication information to the terminal device, the transmission module is further configured to:

[0136] A third measurement result is received from the terminal device, where the third measurement result is a result of the terminal device measuring only the CSI-RS associated with the first beam.

[0137] In one possible implementation, the reference signal includes a sounding reference signal (SRS), the multiple beams are associated with multiple SRS sets, and the transmission module is further configured to:

[0138] A set of SRSs associated with a first beam is received.

[0139] In one possible implementation, the channel includes a physical downlink shared channel PDSCH scheduled in a first downlink control information DCI format, and the transmission module is further configured to:

[0140] Sending a first DCI to the terminal device, where the first DCI is used to schedule the PDSCH;

[0141] Send a PDSCH scheduled in the first DCI format to the terminal device.

[0142] One possible implementation further includes:

[0143] The first DCI includes a first field, where the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive the PDSCH;

[0144] Send a PDSCH scheduled in the first DCI format to the terminal device.

[0145] In one possible implementation, the channel includes a physical uplink shared channel PUSCH scheduled in a second downlink control information DCI format, and transmitting the channel includes:

[0146] Sending a second DCI to the terminal device, where the second DCI is used to schedule the PUSCH;

[0147] A PUSCH scheduled by the second DCI format is received.

[0148] One possible implementation further includes:

[0149] The second DCI includes a second field, where the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send the PUSCH;

[0150] A PUSCH scheduled by the second DCI format is received.

[0151] In a possible implementation, the first indication information includes a media access control element MAC CE.

[0152] In one possible implementation, the first indication information also includes third downlink control information DCI, and the third DCI indicates that the terminal device uses the first beam to communicate with a single transmission node.

[0153] In one possible implementation, multiple network devices include a first network device, the first network device is associated with a first timing advance TA, the first indication information is used to activate one or several beams associated with the first network device, and the one or several beams associated with the first network device are all associated with the first TA.

[0154] In a possible implementation, the first indication information takes effect when: after a first time period of receiving confirmation information.

[0155] In a possible implementation, the first communication mode is a multiple receiving transmission point mode MTRP, and the second communication mode is a single receiving transmission point mode STRP.

[0156] In a fifth aspect, the present application provides a communication device, characterized in that it includes a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices and transmit them to the processor or send signals from the processor to other communication devices, and the processor is used to implement the method in the above-mentioned first aspect or any possible implementation of the first aspect through logic circuits or execution code instructions, or to implement the method in the above-mentioned second aspect or any possible implementation of the second aspect.

[0157] In a sixth aspect, the present application provides a communication system, including a terminal device and a network device,

[0158] The terminal device executes the method in the first aspect or any possible implementation of the first aspect;

[0159] The network device executes the method in the above-mentioned second aspect or any possible implementation manner of the second aspect.

[0160] In a seventh aspect, the present application provides a computer program product, which, when running on a computer, enables the computer to execute the method in the above-mentioned first aspect or any possible implementation of the first aspect, or execute the method in the above-mentioned second aspect or any possible implementation of the second aspect.

[0161] In an eighth aspect, the present application provides a chip system, which includes a processor for implementing the method in the first aspect or any possible implementation of the first aspect, or implementing the method in the second aspect or any possible implementation of the second aspect. In one possible design, the chip system also includes a memory for storing program instructions and / or data. The chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0162] In the ninth aspect, the present application provides a computer-readable storage medium, characterized in that a computer program or instruction is stored in the storage medium, and when the computer program or instruction is executed by a communication device, the method in the above-mentioned first aspect or any possible implementation method of the first aspect is implemented.

[0163] The solutions of the second to ninth aspects mentioned above are used to implement or cooperate with the method of the first aspect or any possible implementation thereof, and therefore can achieve the same or corresponding beneficial effects as the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0164] FIG1a is a schematic diagram of the architecture of a communication system used in an embodiment of the present application;

[0165] FIG1b is another schematic diagram of the architecture of a communication system used in an embodiment of the present application;

[0166] FIG1c is a schematic diagram of another architecture of a communication system used in an embodiment of the present application;

[0167] FIG1d is a schematic diagram of a transmission process provided by an embodiment of the present application;

[0168] FIG2 is another schematic diagram of a flow chart of a transmission method provided in an embodiment of the present application;

[0169] FIG3 is a schematic diagram of the composition of a CSI-RS set for non-coherent joint transmission provided in an embodiment of the present application;

[0170] FIG4 is another schematic diagram of a flow chart of a transmission method provided in an embodiment of the present application;

[0171] FIG5 is another schematic flow chart of a transmission method according to an embodiment of the present application;

[0172] FIG6 is another schematic flow chart of a transmission method according to an embodiment of the present application;

[0173] FIG7 is another schematic flow chart of a transmission method according to an embodiment of the present application;

[0174] FIG8 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0175] FIG9 is another schematic structural diagram of a communication device provided in an embodiment of the present application;

[0176] FIG10 is another structural diagram of a communication device provided in an embodiment of the present application;

[0177] FIG11 is another schematic structural diagram of a communication device provided in an embodiment of the present application;

[0178] FIG12 is another structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0179] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application. It is known to those skilled in the art that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0180] The terms "first," "second," and the like in the specification and claims of this application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to these processes, methods, products, or apparatus.

[0181] The term "and / or" as used in this application can be used to describe an association relationship between related objects, indicating that three possible relationships exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0182] It should also be noted that, in some alternative implementations, the functions / acts noted may occur out of the order of the drawings. For example, two figures shown in succession may in fact occur substantially concurrently or may sometimes be executed in the reverse order, depending on the functionality / acts involved.

[0183] In the embodiments of the present application, unless otherwise specified, the meaning of "at least one" refers to one or more, and the meaning of "a plurality of" refers to two or more. It is understood that in the present application, "when...", "if" and "if" all mean that the device will make corresponding processing under certain objective circumstances, and do not limit the time, nor do they require that there must be a judgment action when the device is implemented, nor do they mean that there are other limitations. In addition, the special word "exemplary" means "used as an example, embodiment or illustrative". Any embodiment described as "exemplary" is not necessarily interpreted as being superior to or better than other embodiments.

[0184] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0185] First, in order to better understand the solution of the embodiment of the present application, the application scenario of the embodiment of the present application is described below.

[0186] Please refer to Figure 1a, which is a schematic diagram of the architecture of a communication system used in an embodiment of the present application. As shown in Figure 1a, communication system 1000 includes a radio access network 100 and a core network 200. Optionally, communication system 1000 may also include the Internet 300. The radio access network 100 may include at least one network device (such as 110a and 110b in Figure 1a) and at least one terminal device (such as 120a-120j in Figure 1a). The terminal device is wirelessly connected to the network device, and the network device is wirelessly or wiredly connected to the core network. The core network device and the network device may be independent and distinct physical devices, or the functions of the core network device and the logical functions of the network device may be integrated into the same physical device, or a single physical device may integrate some of the functions of the core network device and some of the functions of the network device. Terminal devices and network devices may be interconnected via wired or wireless connections. Figure 1a is merely a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in Figure 1a.

[0187] A network device is an access device that allows a terminal device to wirelessly access a communication system. A network device can be a base station, an evolved NodeB (eNodeB), a transmission and reception point (TRP), a next-generation NodeB (gNB) in a fifth-generation (5G) mobile communication system, a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a Wi-Fi system. It can also be a module or unit that performs some of the functions of a base station, such as a centralized unit (CU) or a distributed unit (DU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part of the physical layer or all of the physical layer. For the specific description of each of the above protocol layers, please refer to the relevant technical specifications of the 3rd Generation Partnership Project (3GPP). The network device can be a macro base station (such as 110a in Figure 1a), a micro base station or an indoor station (such as 110b in Figure 1a), or a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device. The following is an example of a base station.

[0188] A terminal device is a device with wireless transceiver capabilities that can send signals to or receive signals from network devices. A terminal device may also be referred to as user equipment (UE), a mobile station, or a mobile terminal device. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), the Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, and smart cities. A terminal device may be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver capabilities, a wearable device, a vehicle, a vehicle-mounted mobile device, an airplane, a ship, a robot, a robotic arm, a personal digital assistant, a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, or various IoT devices. The embodiments of this application do not limit the specific technology and device form factors used by the terminal device.

[0189] Network devices and terminal devices can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons, and artificial satellites. The embodiments of this application do not limit the application scenarios of network devices and terminal devices.

[0190] The roles of network devices and terminal devices can be relative. For example, the helicopter or drone 120i in Figure 1a can be configured as a mobile network device. To terminal devices 120j accessing the wireless access network 100 via 120i, terminal device 120i is a network device. However, to network device 110a, 120i is a terminal device, meaning that communication between 110a and 120i occurs via a wireless air interface protocol. Of course, communication between 110a and 120i can also occur via an interface protocol between network devices. In this case, 120i is also a network device relative to 110a. Therefore, both network devices and terminal devices can be collectively referred to as communication devices. 110a and 110b in Figure 1a can be referred to as communication devices with network device functionality, while 120a-120j in Figure 1a can be referred to as communication devices with terminal device functionality.

[0191] Network devices and terminal devices, network devices and network devices, and terminal devices and terminal devices can communicate through authorized spectrum, unauthorized spectrum, or both; can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz simultaneously. The embodiments of the present application do not limit the spectrum resources used for wireless communications.

[0192] In the embodiments of the present application, the functions of the network device may also be performed by a module (such as a chip) in the network device, or by a control subsystem that includes the network device functions. The control subsystem that includes the network device functions here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device that includes the terminal device functions.

[0193] The transmission method provided in the embodiments of the present application can be applied to downlink (DL) data transmission, uplink (UL) data transmission, and device-to-device (D2D) data transmission. For downlink data transmission, the sending device is a network device, and the corresponding receiving device is a terminal device. For uplink data transmission, the sending device is a terminal device, and the corresponding receiving device is a network device. For D2D data transmission, the sending device is a terminal device, and the corresponding receiving device is also a terminal device. The embodiments of the present application do not limit the application scenarios.

[0194] The transmission method provided in the embodiment of the present application can be applied to a communication system that adopts the hybrid automatic repeat request HARQ technology, can be applied to a frequency division duplex (FDD) system, and can also be applied to a time division duplex (TDD) system. The transmission method provided in the embodiment of the present application can be applied to any communication system that adopts, for example, a low density parity check (LDPC) code or a polar code as a data channel coding method, and can also be applied to a 5G communication system and other wireless communication systems. The embodiment of the present application is not limited to this.

[0195] Network devices and terminal devices, as well as terminal devices and terminal devices, can communicate through licensed spectrum, or through unlicensed spectrum, or through both licensed spectrum and unlicensed spectrum. Access network devices and terminal devices, as well as terminal devices and terminal devices, can communicate through spectrum below 6G, or through spectrum above 6G, or through spectrum below 6G and spectrum above 6G at the same time. The embodiments of the present application do not limit the spectrum resources used between network devices and terminal devices.

[0196] In addition, in the communication system shown in Figure 1a, the communication between each network device and each terminal device can also be represented in another form. Please refer to Figure 1b, which is another architectural diagram of the communication system used in an embodiment of the present application. Terminal device 10 includes a processor 101, a memory 102, and a transceiver 103. Transceiver 103 includes a transmitter 1031, a receiver 1032, and an antenna 1033. Network device 20 includes a processor 201, a memory 202, and a transceiver 203. Transceiver 203 includes a transmitter 2031, a receiver 2032, and an antenna 2033. Receiver 1032 can be configured to receive transmission control information via antenna 1033, and transmitter 1031 can be configured to send transmission feedback information to network device 20 via antenna 1033. Transmitter 2031 can be configured to send transmission control information to terminal device 10 via antenna 2033, and receiver 2032 can be configured to receive transmission feedback information sent by terminal device 10 via antenna 2033.

[0197] It should be understood that the communication scenarios shown in Figures 1a and 1b are merely examples, and this application does not impose any specific restrictions on the number of terminal devices and network devices in the communication system. The transmission method provided in the embodiments of this application can be applied to the above-described structure, but is not limited thereto.

[0198] In the communication scenarios shown in Figures 1a and 1b above, network devices and terminal devices can communicate based on beams. A beam can include one or more antenna ports for transmitting data channels, control channels, and sounding signals. For example, a transmit beam refers to the distribution of signal strength in different directions in space after a signal is transmitted by an antenna, while a receive beam refers to the distribution of signal strength in different directions in space after a wireless signal is received by an antenna.

[0199] The network device may include one or more transmission nodes. The network device can communicate with a terminal device simultaneously through multiple transmission nodes (multiple antennas, or multiple sites, or multiple transceiver units) to transmit data or provide services for the terminal device. In a transmission scenario or communication mode of multiple transmission nodes, the network device needs to indicate multiple common beams to the terminal device for multi-node transmission. For example, please refer to Figure 1c, which is another architectural diagram of the communication system applied in the embodiment of the present application. As shown in Figure 1c, taking the network device as a base station as an example, two base stations transmit signals to the terminal device at the same time, and each base station uses a common beam. The network device needs to indicate the common beams corresponding to the two sites to the terminal device. After the terminal device receives the two common beams, it needs to further determine how the two common beams are applied to the transmission of each channel or reference signal. For example, for the physical downlink control channel (PDCCH), some PDCCHs are sent through base station 1 and require public beam 1, some are sent through base station 2 and require public beam 2, and some are sent through both base stations 1 and 2 and require public beam 1 and public beam 2. The terminal device needs to determine which PDCCHs use which public beam.

[0200] It should be understood that transmission in this application may refer to sending or receiving.

[0201] The transmission method provided in the embodiments of the present application can be applied to a variety of scenarios.

[0202] On the basis that the network device communicates with the terminal device through multiple transmission nodes, the main application scenario of the embodiments of the present application is how the terminal device and the network device measure or transmit reference signals and transmit channels based on a single transmission node in a scenario where the terminal device is instructed to be associated only with a single transmission node of the network device.

[0203] The following scenarios may apply to why a terminal device is instructed to associate with only a single transmission node:

[0204] Example scenario 1: Switching from the first communication mode to the second communication mode;

[0205] The first communication mode is that the terminal device uses multiple beams to communicate with multiple transmission nodes respectively. It can also be understood that the terminal device uses multiple beams to communicate with the network device. It can also be understood that the terminal device communicates with the network device through multiple transmission nodes.

[0206] The second communication mode indicates that the terminal device uses a single beam to communicate with a single transmission node. It can also be understood that the terminal device uses a single beam to communicate with the network device. It can also be understood that the terminal device communicates with the network device through a single transmission node.

[0207] The multiple beams may be understood as multiple beams indicated to the terminal device. One beam in the multiple beams may be an uplink and downlink common beam, or an uplink common beam and a downlink common beam.

[0208] The single beam can be understood as a single beam indicated by the terminal device. The single beam can be an uplink and downlink common beam, or an uplink common beam and a downlink common beam.

[0209] After the terminal device switches from the first communication mode to the second communication mode, the network device can only use a single transmission node to communicate with the terminal device, and the terminal device uses a specified transmission configuration indicator (TCI) state (TCI-state) or beam to communicate with the network device.

[0210] Optionally, the first communication mode is a multiple reception transmission point mode (MTRP), and the second communication mode is a single reception transmission point mode (STRP). On the basis of a network device communicating with a terminal device through a single transmission node, the main application scenario of the embodiment of the present application is how the terminal device and the network device measure or transmit reference signals and transmit channels based on multiple transmission nodes when the terminal device is instructed to associate with multiple transmission nodes of the network device.

[0211] Example scenario 2: Switching from the second communication mode to the first communication mode;

[0212] The first communication mode indicates that the terminal device communicates with multiple transmission nodes using multiple beams respectively, and the second communication mode indicates that the terminal device communicates with a single transmission node using a single beam.

[0213] After the terminal device switches from the second communication mode to the first communication mode, the network device can use multiple transmission nodes to communicate with the terminal device, and the terminal device uses a specified TCI-state or beam to communicate with the network device.

[0214] Optionally, the first communication mode is a multiple receiving transmission point mode MTRP, and the second communication mode is a single receiving transmission point mode STRP.

[0215] Currently, in communication system 1000, multiple transmission nodes are allowed to communicate simultaneously with a single terminal device. Multiple transmission nodes need to indicate multiple beams to the terminal device, with each transmission node using a single beam to communicate with the terminal device. When a terminal device is instructed to use a single beam to communicate with a single transmission node, a problem arises: if the terminal device still communicates using the beam information corresponding to multiple transmission nodes, resources are wasted.

[0216] For another example, in communication system 1000, one transmission node is allowed to communicate with one terminal device, and one transmission node uses one beam to communicate with the terminal device. The terminal device is reconfigured to communicate with multiple transmission nodes and / or its resources and / or beam selection-related parameters are reconfigured. However, the terminal device is only instructed to use one beam, and thus cannot transmit normally.

[0217] For another example, in communication system 1000, multiple transmission nodes are allowed to communicate with a single terminal device simultaneously. Multiple transmission nodes need to indicate multiple beams to the terminal device, with each transmission node using a single beam to communicate with the terminal device. If the terminal device is reconfigured to communicate with a single transmission node and / or has been reconfigured with resources for a single transmission node and / or has not been configured with parameters related to beam selection, the terminal device cannot determine which of the multiple beams to use for communication with the single transmission node.

[0218] For another example, in communication system 1000, one transmission node is allowed to communicate with one terminal device, and one transmission node uses one beam to communicate with the terminal device. If the terminal device is instructed to use multiple beams for communication, but the terminal device is not configured with parameters related to beam selection and / or the terminal device is only configured with resources for a single transmission node, the terminal device cannot determine which of the multiple beams to use for communication with the single transmission node.

[0219] To address the aforementioned problem 1, embodiments of the present application provide a transmission method and related apparatus. The transmission method is applied to the network devices (110a and 110b) or terminal devices (120a-120j) shown in FIG1a , or to chips, chip systems, processors, etc. that support the aforementioned network devices or terminal devices in implementing the aforementioned method. The network devices may include one or more transmission nodes.

[0220] Specifically, please refer to Figure 1d, which is a flow chart of the transmission method provided in an embodiment of the present application, and the method is mainly applied to terminal devices. The method specifically includes: S1, the terminal device receives a first indication information, and the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode, the first communication mode instructs the terminal device to use multiple beams to communicate with multiple transmission nodes respectively, and the second communication mode instructs the terminal device to use a single beam to communicate with a single transmission node. S2, the terminal device determines the first beam according to the first indication information. S3, the terminal device measures or transmits a reference signal according to the first beam, or transmits a channel.

[0221] In the present application, after receiving the first indication information sent by the network device, the terminal device can switch from the first communication mode to the second communication mode according to the indication of the first indication information, and transmit the reference signal or channel based on the first beam associated with a single transmission node, thereby reducing resource waste and saving overhead. In addition, after switching from the first communication mode to the second communication mode, compared to the transmission of the reference signal or channel only after reconfiguring the associated beam information through the transmission node, the reference signal or channel is transmitted directly based on the beam information associated with a single transmission node, omitting the beam information reconfiguration process and further reducing the transmission delay.

[0222] The above introduces the application scenarios of the transmission method provided in the embodiments of the present application. The following describes in detail the implementation process of the transmission method provided in the embodiments of the present application.

[0223] First, in order to better understand the solutions of the embodiments of the present application, the relevant terms and concepts that may be involved in the embodiments of the present application are introduced below.

[0224] (1) Beam;

[0225] The embodiment of the beam in the new radio (NR) protocol can be a spatial domain filter, or a spatial filter, or a spatial domain parameter, a spatial parameter, a spatial domain setting, a spatial setting, or quasi-co-location (QCL) information, a QCL assumption, a QCL indication, etc. The beam can be indicated by the transmission configuration indicator (TCI) state, that is, the TCI-state parameter, or by a spatial relation parameter. Therefore, in this application, the beam can be replaced by a spatial filter, a spatial filter, a spatial parameter, a spatial parameter, a spatial setting, a spatial setting, QCL information, a QCL assumption, a QCL indication, a TCI-state (DL TCI-state, UL TCI-state), a spatial relationship, etc. The above terms are also equivalent to each other. The beam can also be replaced by other terms representing the beam, which is not limited in this application.

[0226] The beam used to transmit a signal may be referred to as a transmission beam (Tx beam), or may be referred to as a spatial domain transmission filter, a spatial transmission filter, a spatial domain transmission parameter, or a spatial transmission parameter, or a spatial domain transmission setting. The downlink transmit beam may be indicated by a TCI-state.

[0227] The beam used to receive signals can be called a reception beam (Rx beam), and can also be called a spatial domain reception filter, a spatial reception filter, a spatial domain reception parameter, or a spatial reception parameter, a spatial domain reception setting, or a spatial reception setting. The uplink transmit beam can be indicated by a spatial relation, an uplink TCI-state, or an SRS resource (indicating the transmit beam using the SRS). Therefore, the uplink beam can also be replaced by an SRS resource.

[0228] The transmit beam may refer to the distribution of signal strength in different directions in space after the signal is transmitted by the antenna, and the receive beam may refer to the distribution of signal strength in different directions in space of the wireless signal received from the antenna.

[0229] Furthermore, the beam can be a wide beam, a narrow beam, or other types of beams. The beam forming technology can be beamforming technology or other technologies. The beamforming technology can specifically be digital beamforming technology, analog beamforming technology, or hybrid digital / analog beamforming technology.

[0230] Beams generally correspond to resources. For example, during beam measurement, network equipment uses different resources to measure different beams. The terminal device then provides feedback on the measured resource quality, which allows the network equipment to determine the quality of the corresponding beam. During data transmission, beam information is also indicated by its corresponding resource. For example, the network equipment uses the TCI field in the downlink control information (DCI) to indicate PDSCH beam information to the terminal device.

[0231] Optionally, multiple beams with the same or similar communication characteristics can be considered a single beam. A beam can include one or more antenna ports for transmitting data channels, control channels, and sounding signals. The one or more antenna ports forming a beam can also be considered an antenna port set.

[0232] In beam measurement, each beam of a network device corresponds to a resource, so the beam corresponding to the resource can be uniquely identified by the resource index.

[0233] (2) Reference signal (RS);

[0234] According to the protocols of the Long Term Evolution (LTE) system / New Radio (NR) system, at the physical layer, uplink communication includes the transmission of uplink physical channels and uplink signals. The uplink physical channels include the physical random access channel (PRACH), the physical uplink control channel (PUCCH), the physical uplink shared channel (PUSCH), etc. The uplink signals include the channel sounding signal (SRS), the uplink control channel demodulation reference signal (PUCCH de-modulation reference signal, PUCCH-DMRS), the uplink data channel demodulation reference signal (PUSCH de-modulation reference signal, PUSCH-DMRS), the uplink phase noise tracking reference signal (PTRS), the uplink positioning signal (uplink positioning RS), etc. Downlink communication includes the transmission of downlink physical channels and downlink signals. The downlink physical channels include the physical broadcast channel (PBCH), the physical downlink control channel (PDCCH), the PDSCH, etc. The downlink signals include the primary synchronization signal (PSS) / secondary synchronization signal (SSS), the downlink control channel demodulation reference signal (PDCCH de-modulation reference signal, PDCCH-DMRS), the downlink data channel demodulation reference signal (PDSCH de-modulation reference signal, PDSCH-DMRS), the phase noise tracking signal PTRS, the channel state information reference signal CSI-RS, the cell reference signal (CRS) (there is no CRS in the NR system but there is CRS in the LTE system), the time-frequency tracking reference signal (TRS) (there is no TRS in the LTE system but there is TRS in the NR system), the LTE / NR positioning signal (positioning RS), etc.

[0235] (3)TCI;

[0236] Network equipment can generate different beams pointing in different transmission directions. In downlink data transmission, when a network device uses a specific beam to send data to a terminal device, it needs to inform the terminal device of the transmission beam information it uses, so that the terminal device can use the receiving beam corresponding to the transmitting beam to receive the data sent by the network device. In the 3rd Generation Partnership Project Release 15 (3GPP R15) protocol or the 3GPP R16 protocol, the network device indicates to the terminal device the relevant information of the transmitting beam it uses through the transmission configuration index (TCI) field in the DCI.

[0237] Specifically, the TCI field is 3 bits in size and can represent 8 different field values ​​(code points). Each TCI field value corresponds to a TCI-state index, which uniquely identifies a TCI-state. The TCI-state includes several parameters that determine the relevant information of the transmit beam. The TCI-state is configured by the network device for each terminal device.

[0238] The configuration information of each TCI-state includes its own index tci-StateId and two QCL-Info. Each QCL-Info includes a cell field and bwp-Id, which respectively indicate which bwp (Bandwidth part) of which cell the TCI-state is applied to, that is, different cells or different bwp of the same cell can be configured with different QCL-Info. QCL-Info also includes a reference signal to indicate which reference signal resource constitutes the QCL relationship.

[0239] In the R15 / R16 protocols, the word "beam" generally does not appear directly; it is usually replaced by other terms. For example, in data transmission and channel measurement, beams correspond to reference signal resources, with one beam corresponding to one reference signal resource. Therefore, when we say which reference signal resource forms a QCL relationship, we are actually referring to which beam forms a QCL relationship. A QCL relationship means that two reference signal resources (or two antenna ports, where antenna ports and reference signal resources also have a one-to-one correspondence) have certain identical spatial parameters. Which spatial parameters are identical depends on the type of the QCL-Info, i.e., another field of the QCL-Info, qcl-Type. qcl-Type can have four values ​​{typeA, typeB, typeC, typeD}. Taking typeD as an example, typeD indicates that the two reference signal resources have the same spatial reception parameter information, i.e., the two beams have the same receive beam. At most one of the two QCL-Info included in the TCI-state can be TypeD.

[0240] The following example illustrates how a network device based on the R15 / R16 protocol uses TCI-state to indicate the receive beam information of a data transmission beam to a terminal device, including the configuration, activation, and indication of TCI-state.

[0241] TCI-state configuration: The network device configures multiple TCI-states to the terminal device through radio resource control (RRC) signaling.

[0242] TCI-state activation: After a network device is configured with multiple TCI-states, it must activate eight of them through MAC CE. These eight TCI-states correspond one-to-one to the eight values ​​of the TCI field in the DCI. The TCI-states corresponding to the eight values ​​in the DCI TCI field are determined through MAC CE signaling.

[0243] It should be noted that there are many types of MAC CEs. In addition to MAC CEs used for TCI-state activation, there are also MAC CEs for many other purposes. This application only covers MAC CEs used for TCI-state / TCI-state combination activation. Therefore, unless otherwise specified, the MAC CEs described in this application refer to this type of MAC CE.

[0244] TCI-state indication: The network device indicates a specific TCI-state through the TCI field in the DCI. For example, the value of the TCI field in the DCI sent by the network device to the terminal device is 000, indicating the TCI-state corresponding to 000 adopted by the data transmission beam. The reference Signal contained in the QCL-Info of type D in the TCI-state is the CSI-RS (Channel State Information–Reference Signal) with an index of #1, indicating that the beam used for data transmission is the same as the receiving beam corresponding to the CSI-RS with an index of #1. The receiving beam corresponding to the CSI-RS with an index of #1 can be determined through the beam measurement process and is known to the terminal device. Therefore, through the specific value of the TCI field, the terminal device can determine the receiving beam corresponding to the data transmission beam, and thus adopt the corresponding receiving beam to receive data.

[0245] (4) R17 unified TCI;

[0246] Unified TCI is introduced in R17. Unified TCI (common beam) is a unified beam indication framework. The network device can indicate a beam to the terminal device, and the beam is used for multiple channels and / or reference signals at the same time. The common beam can be an uplink common beam, a downlink common beam, or an uplink and downlink common beam. The terminal device can use the common beam in subsequent transmissions. That is, the network device can indicate an uplink common beam to the terminal device for the transmission of multiple uplink channels and / or uplink reference signals. It can also indicate a downlink common beam to the terminal device for the transmission of multiple downlink channels and / or downlink reference signals. It can also indicate an uplink and downlink common beam to the terminal device for the transmission of multiple uplink channels and / or uplink reference signals, as well as multiple downlink channels and / or downlink reference signals. In other words, the uplink and downlink common beams can be used for both uplink and downlink transmissions.

[0247] In R17, terminal devices can be configured with two TCI-states: DL or joint TCI and UL TCI.

[0248] The UE can configure joint / DL TCI-states (up to 128) and UL TCI-states (up to 64) simultaneously.

[0249] In the serving cell config of RRC signaling, the base station can configure the UE's current TCI mode to be joint or separate. In joint mode, a joint TCI-state is indicated for both uplink and downlink transmissions. In separate mode, the base station needs to indicate the DL TCI-state and UL TCI-state for each, respectively.

[0250] Optionally, when the UE receives TCI-state activation signaling indicated by MAC-CE, the activation signaling includes the index (identity, ID) of the TCI-state, and the UE determines which TCI is activated by MAC-CE according to the RRC configuration.

[0251] If the RRC configuration is for joint mode, the TCI-state ID is the joint TCI-state ID. If the RRC configuration is for separate mode, the UE determines whether the TCI-state ID is the DL TCI-state ID or the UL TCI-state ID based on the value of the D / L field. (Specifically, 0 is UL TCI and 1 is DL TCI.)

[0252] (5)Rel-18mTRP unified TCI framework;

[0253] Rel-18 enhances the unified TCI framework in the mTRP (multiple transmission and reception point) scenario, where mTRP is a transmission technology similar to LTE CoMP (coordinate multi-point), which allows the network to transmit data (services) to a user simultaneously through multiple nodes (multiple antennas, or multiple sites, or multiple transceiver units). In the multi-station transmission scenario, the network device needs to indicate multiple common beams to the terminal device for multi-station transmission. As shown in Figure 1d above, two base stations transmit signals to the terminal device at the same time, and each base station uses a common beam. The network device needs to indicate the common beams corresponding to the two sites to the terminal device. After the terminal device receives the two common beams, it needs to further determine how the two common beams are applied to the transmission of each channel or reference signal.

[0254] mTRP scenarios are further divided into single downlink control information (SDCI) mTRP and multiple downlink control information (mDCI) mTRP. SDCI mTRP refers to when two nodes serving a single user have ideal backhaul (meaning the information exchange delay between the two nodes is negligible), allowing the two nodes to jointly serve the UE in a very close manner. In this case, one of the two nodes sends DCI to achieve unified / joint scheduling of the UE. In this case, DCI only needs to be sent once, and this DCI will indicate the beams used by the UE to receive data from both nodes (i.e., two beams are used for each node, respectively). mDCI mTRP refers to when two nodes serving a single user (i.e., nodes TRP) do not have ideal backhaul (meaning the information exchange delay between the two nodes is large and non-negligible), and the two nodes cannot jointly serve the UE in a very close manner. In this case, the two nodes should independently schedule the UE. Due to independent scheduling, the two nodes need to independently send DCI commands to the UE for scheduling, so the resource allocation and beam indication of the two nodes are sent separately via two independent DCIs.

[0255] (6) Timing advance;

[0256] Signals travel in space with a delay. The farther a terminal device is from a network device, the greater the delay in the signal reaching the network device. Different terminal devices are at varying distances from the network device, so the time difference between signals arriving at the network device varies. Consequently, when a terminal device receives downlink information from a network device and then sends an uplink signal, the signals arrive at the network device at different times.

[0257] In order to ensure the orthogonality of uplink transmission and avoid intra-cell interference, the network equipment requires that the time when signals from different terminal devices in the same subframe but different frequency domain resources arrive at the network equipment is basically aligned. As long as they fall within the cyclic prefix (CP) range, the network equipment can correctly receive the uplink data sent by the terminal device. Therefore, the uplink transmission of the terminal device needs to be timed ahead relative to the downlink reception, and the timing advance (TA) of different terminal devices is different, so that the network equipment can receive signals from different terminal devices within the CP range. The UE can configure a group of service cells, among which the service cells with the same uplink timing or the same TA are in the same timing advance group (TAG) and are configured with the same TAG ID.

[0258] This application provides a transmission method. For ease of understanding, the transmission method provided by the embodiment of this application is described in detail below in conjunction with the accompanying drawings and application scenarios. Those skilled in the art will appreciate that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of this application are equally applicable to similar technical problems.

[0259] Based on the different types of reference signals or channels, the embodiments of the present application include multiple implementation methods. The following examples illustrate the following steps by taking the reference signals including CSI-RS and SRS, and the channels including PDSCH scheduled by the first DCI format and PUSCH scheduled by the second DCI as examples. It should be understood that the types of reference signals or channels mentioned above are only a few commonly used types. The embodiments of the present application take the above-mentioned reference signals or channels as an example to specifically illustrate the transmission method described in the embodiments of the present application. In actual applications, different types of reference signals or channels can be selected for communication according to actual needs, and this is not limited here.

[0260] For ease of explanation, this embodiment of the present application assumes that a terminal device uses two beams to communicate with two transmission nodes, and assumes that one transmission node corresponds to one network device, and assumes a first TCI-state corresponding to the first beam. In actual application, the number of transmission nodes, the correspondence between transmission nodes and network devices, and the application scenarios of this embodiment can all be set according to actual needs. This embodiment is for illustrative purposes only and is not intended to be limiting.

[0261] It is understood that in a multi-transmission node communication mode, a network device can use multiple transmission nodes (antennas, sites, transceiver units) to communicate with the same terminal device. Multiple transmission nodes can correspond to multiple network devices, or some transmission nodes can correspond to one network device, while other transmission nodes can correspond to other network devices. This is not limited here.

[0262] In addition, this embodiment can be applied to a variety of scenarios, such as the above-mentioned example scenario 1 and example scenario 2, or other scenarios, which are not limited in this embodiment.

[0263] (a) Implementation method 1: The reference signal is CSI-RS;

[0264] Please refer to Figure 2, which is another flow diagram of the transmission method provided in an embodiment of the present application. The transmission method can be performed by the terminal device and network device shown in Figure 1a. As shown in Figure 2, the transmission method includes one or more of steps 201 to 207.

[0265] Step 201: The network device sends configuration information to the terminal device.

[0266] In this embodiment, during communication between the network device and the terminal device, the network device sends configuration information to the terminal device so that the terminal device configures relevant resources according to the configuration information. The configuration information includes CSI-RS resource configuration and reporting method.

[0267] The configuration information also includes the mapping between channels or reference signals and multiple (pairs of) unified TCI states. When the terminal device is configured in joint mode, that is, the same beam is used for both uplink and downlink transmissions between the transmitting node and the terminal device, the configuration information includes the mapping between channels or reference signals and two unified TCI states. Each unified TCI state is a joint / DL TCI state. The joint / DL TCI state can be referred to as a joint TCI state. The beam corresponding to the joint TCI state serves as the beam for downlink and uplink transmissions by the terminal device. The terminal device is configured in separate mode, that is, different beams are used for uplink and downlink transmission between the transmission node and the terminal device. The configuration information includes the correspondence between the channel or reference signal and two pairs of unified TCI-states. Each pair of unified TCI-states contains a joint / DL TCI-state and an uplink TCI state (UL TCI-state). The joint / DL TCI state can be called the DL TCI state. The beam corresponding to the DL TCI state is used as the beam for uplink transmission of the terminal device, and the beam corresponding to the UL TCI state is used as the beam for uplink transmission of the terminal device.

[0268] Optionally, the network device uses RRC signaling to send configuration information to the terminal device.

[0269] In an optional implementation, the configuration information further includes first configuration information.

[0270] In this implementation, the first configuration information is used by the network device to instruct the CSI-RS resource configuration and reporting method. Specifically, the first configuration information instructs the terminal device to report the second measurement results of K groups of CSI-RS, where K is greater than or equal to 0, and the second measurement results of each group of CSI-RS include measurement results of at least two CSI-RSs, and the at least two CSI-RSs are from different CSI-RS sets.

[0271] For example, the method of measuring and reporting CSI-RS by the terminal device is described by taking the example of a network device sending configuration information to the terminal device using RRC signaling.

[0272] The first configuration information includes one or more CSI-RS sets (CSI-RS resource set), which configures each CSI-RS set of the terminal device to adopt which indicated joint / DL TCI-state. Taking the example of the network device indicating two joint / DL TCI-states to the terminal device, the first configuration information configures each CSI-RS set of the terminal device to adopt the first or second indicated joint / DL TCI-state. Taking two CSI-RS sets (CSI-RS resource sets) as an example, two CSI-RS sets (CSI-RS resource sets) are configured through the first configuration information, corresponding to the beam measurement reference signals of the two transmission nodes respectively, and the CSI-RS in CSI-RS set 1 (CSI-RS resource set 1) is configured to adopt the first joint / DL TCI-state, and the CSI-RS in CSI-RS set 2 (CSI-RS resource set 2) is configured to adopt the second joint / DL TCI-state.

[0273] The reporting method is group-based beam reporting, that is, reporting the second measurement results of K groups of CSI-RS. Each group of CSI-RS contains two CSI-RSs, and the two CSI-RSs come from two CSI-RS sets and can be received by the terminal device at the same time.

[0274] In another optional implementation, the configuration information may further include second configuration information.

[0275] In this implementation, the second configuration information is used by the network device to instruct the terminal device to measure and report CSI-RS using non-coherent joint transmission (NCJT). Specifically, the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of a CSI-RS resource pair.

[0276] For example, taking the example of a network device using RRC signaling to send configuration information to a terminal device, the method of measuring and reporting the CSI-RS of NCJT by the terminal device is explained.

[0277] Assume that the composition of the CSI-RS set is as follows:

[0278] Please refer to Figure 3, which is a schematic diagram of the composition of the CSI-RS set of NCJT provided in an embodiment of the present application. As shown in Figure 3, the second configuration information includes: a CSI-RS set (CSI-RS resource set) includes two CSI-RS groups (CSI-RS group), and one or two CSI-RS resource pairs (CSI-RS resource pair), wherein CSI-RS group 1 includes K1 CSI-RSs (corresponding to transmission node 1), CSI-RS group 2 includes K2 CSI-RSs (corresponding to transmission node 2), and each CSI-RS resource pair includes two CSI-RSs, one from CSI-RS group 1 and the other from CSI-RS group 2. Each CSI-RS adopts the indicated first or second joint / DL TCI-state. When each CSI-RS is not configured to adopt the indicated first or second joint / DL TCI-state, the terminal device assumes that CSI-RS group 1 adopts the first joint / DL TCI-state and CSI-RS group 2 adopts the second joint / DL TCI-state.

[0279] There are two reporting methods.

[0280] The first method is to configure the csi-ReportMode in the RRC signaling to Mode1 or Mode2.

[0281] When csi-ReportMode is Mode1, the terminal device needs to report non-coherent joint transmission channel state information (NCJT CSI) (i.e., the fifth measurement result) and channel state information (CSI) of X single transmission nodes (i.e., the fourth measurement result, corresponding to the measurement results including CSI-RS1 to CSI-RS7 in Figure 3), where X = 0, 1, or 2. The value of X can be configured by RRC signaling. For example, it can be configured by RRC signaling numberOfSingleTRP-CSI-Mode1. Among them, NCJT CSI (fifth measurement result) corresponds to the measurement result of one CSI-RS resource pair among the configured 1 or 2 CSI-RS resource pairs. Each NCJT CSI contains 1 CSI-RS resource indicator (CRI), 2 rank indications (RI), 2 precoding matrix indications (PMI) and 1 channel quality information (CQI); or, 1 CRI, 2 RIs, 2 layer indicators (LI), 2 PMIs and 1 CQI. Among them, 1 CRI corresponds to the index of the configured 1 or 2 CSI-RS resource pairs, that is, the index of CSI-RS resource pair 1 or CSI-RS resource pair 2. The CSI of a single transmission node (the fourth measurement result) is the measurement result of a single CSI-RS. The CSI of each single transmission node includes 1 CRI, 1 RI, 1 PMI and 1 CQI; or, 1 CRI, 1 RI, 1 LI, 1 PMI and 1 CQI. When X = 0, the terminal device does not report the measurement result of a single CSI-RS, that is, it does not report the measurement results of CSI-RS 1 to 7. When X = 1, the measurement result of one CSI-RS is selected from the two CSI-RS groups for reporting. According to Figure 3, it can be understood that the measurement result of one CSI-RS is selected from {CSI-RS1, CSI-RS2, CSI-RS 3, CSI-RS 4} or the measurement result of one CSI-RS is selected from {CSI-RS 5, CSI-RS 6, CSI-RS 7} for reporting. When X = 2, the measurement results of two CSI-RSs are selected from the two CSI-RS groups for reporting.According to FIG3 , it can be understood that a measurement result of a CSI-RS is selected from {CSI-RS1, CSI-RS2, CSI-RS 3, CSI-RS 4} and a measurement result of a CSI-RS is selected from {CSI-RS 5, CSI-RS 6, CSI-RS 7} for reporting.

[0282] When csi-ReportMode is Mode2, the terminal device needs to report an NCJT CSI (i.e., the fifth measurement result) or the CSI of a single transmission node (i.e., the fourth measurement result, corresponding to CSI-RS1 to 7 in Figure 3), that is, either the measurement result of a CSI-RS resource pair, or the measurement result of a CSI RS in CSI-RS group 1, or the measurement result of a CSI RS in CSI-RS group 2.

[0283] In addition, when RRC is configured with SharedCMR, the CSI-RS corresponding to the CSI of a single transmission node can be the CSI-RS in the CSI-RS resource pair (i.e., the CSI-RS in CSI-RS1 to CSI-RS7). When RRC is not configured with SharedCMR, the CSI-RS corresponding to the CSI of a single transmission node cannot be the CSI-RS in the CSI-RS resource pair (i.e., it can only be the measurement result of the CSI-RS in CSI-RS3, CSI-RS4, and CSI-RS7, and cannot be the measurement result of the CSI-RS in CSI-RS1, CSI-RS2, CSI-RS5, and CSI-RS6). For example, when CSI-RS group 1 contains {CSI-RS1, CSI-RS2, CSI-RS 3, CSI-RS 4}, CSI-RS group 2 contains {CSI-RS 5, CSI-RS 6, CSI-RS 7}, and two pairs of CSI-RS resource pairs are configured, resource pair 1 includes {CSI-RS1, CSI-RS 5}, and resource pair 2 includes {CSI-RS2, CSI-RS 6}, then when SharedCMR is configured, the resources corresponding to the CSI of a single transmission node can be {CSI-RS1, CSI-RS2, CSI-RS 3, CSI-RS 4, CSI-RS 5, CSI-RS 6, CSI-RS 7}. When SharedCMR is not configured, the resources corresponding to the CSI of a single transmission node can only be {CSI-RS 3, CSI-RS 4, CSI-RS 7}.

[0284] In another optional implementation, the configuration information may further include third configuration information.

[0285] The third configuration information is used to instruct the terminal device to operate in the first communication mode, that is, to instruct the terminal device to communicate with the network device through multiple transmission nodes, or to instruct the terminal device to communicate with the network device through multiple beams, or to instruct the terminal device to communicate with multiple transmission nodes through multiple beams.

[0286] Optionally, the third configuration information further includes relevant configuration parameters for TCI selection, which are used to configure the correspondence between the channel or reference signal and two (pairs of) unified TCI states.

[0287] In yet another optional implementation, the configuration information may further include fourth configuration information.

[0288] When the terminal device operates in the second communication mode, the fourth configuration information is used to instruct the terminal device to switch from the second communication mode to the first communication mode.

[0289] Optionally, the fourth configuration information further includes relevant configuration parameters for TCI selection, which are used to configure the correspondence between the channel or reference signal and two (pairs of) unified TCI states.

[0290] The configuration information may include CSI-RS resource configuration and reporting method, and may also include any one or more of the above-mentioned first configuration information, second configuration information, third configuration information, and fourth configuration information. The first configuration information and the second configuration information may implicitly indicate that the terminal device operates in the first communication mode, or implicitly indicate that the terminal device switches from the second communication mode to the first communication mode.

[0291] Optionally, this embodiment further includes step 202. Step 202 may be performed before step 201 or after step 201.

[0292] Step 202: The network device sends first indication information to the terminal device.

[0293] In this embodiment, the first indication information can be used to indicate beam information, which is used to instruct the terminal device to use the indicated beam to communicate with the network device through a single transmission node.

[0294] It is understood that in the 3GPP R15 / R16 protocol, the TCI-state is configured by the network device for each terminal device. The TCI-state includes several parameters that determine the relevant information of the transmission beam. Therefore, in this embodiment, the TCI-state can be used to represent the beam used by the network device to communicate with the terminal device. The terminal device communicates with the network device using the TCI-state specified by the network device. It can be understood that one TCI-state corresponds to one beam.

[0295] In an optional implementation manner, the first indication information is carried in the first MAC CE signaling.

[0296] The first MAC CE signaling is used to activate one or more TCI-states corresponding to a transmission node.

[0297] Optionally, when the terminal device operates in the second communication mode, the first MAC CE signaling is used to activate one or more TCI-states.

[0298] Optionally, when the terminal device operates in the first communication mode, the first MAC CE signaling only activates one or more TCI-states associated with a transmission node. It can be understood that the first MAC CE activation TCI-state signaling only contains the first or second joint / DL / UL TCI-state, implicitly instructing the terminal device to switch to the second communication mode.

[0299] Optionally, when the terminal device operates in the first communication mode, the first MAC CE signaling may include a field that explicitly indicates that the terminal device switches from the first communication mode to the second communication mode.

[0300] In an optional implementation manner, the first indication information is carried in the first MAC CE signaling and the third DCI signaling.

[0301] If the first MAC CE signaling activates only one TCI-state, and the terminal device is able to determine the unique TCI-state to communicate with the network device, the network device does not need to issue a third DCI indication to further instruct the terminal device which TCI-state to use. If the first MAC CE signaling activates multiple TCI-states, the network device needs to further issue a third DCI indication to instruct the terminal device which TCI-state to use. In this case, optionally, the first indication information is carried in the first MAC CE signaling and the third DCI signaling, and the third DCI instructs the terminal device to use the first beam to communicate with a single transmission node.

[0302] The first MAC CE signaling activates only one TCI-state, which can be understood as one TCI-state corresponding to one code point, and one code point contains one joint TCI-state, or one DL TCI-state and one UL TCI-state.

[0303] The first MAC CE signaling activates multiple TCI-states, which can be understood as corresponding to multiple code points. Each code point contains a joint TCI-state or a DL TCI-state and a UL TCI-state.

[0304] Optionally, when the terminal device operates in the first communication mode, the third DCI signaling may include a field that explicitly indicates that the terminal device switches from the first communication mode to the second communication mode.

[0305] It is understood that the first MAC CE signaling described above may be a newly defined MAC CE signaling. Alternatively, existing MAC CE signaling may be utilized to activate TCI-states by modifying some information or rules in the MAC CE signaling. The specific form is not limited.

[0306] It is understandable that the third DCI signaling may be a newly defined DCI signaling, or may utilize the existing DCI beam indication signaling.

[0307] Optionally, this embodiment further includes step 202a, which can be performed before or after step 202.

[0308] Step 202a: The network device sends third indication information to the terminal device.

[0309] In an optional implementation manner, the third indication information is carried in the second MAC CE signaling or the fourth DCI signaling.

[0310] Optionally, when the terminal device operates in the first communication mode, the first indication information is carried in the second MAC CE signaling or the fourth DCI signaling, and may include a field that explicitly indicates that the terminal device switches from the first communication mode to the second communication mode.

[0311] It is understandable that the second MAC CE signaling or the fourth DCI signaling may be a newly defined MAC CE or DCI signaling. Alternatively, the existing MAC CE or DCI signaling may be utilized to explicitly instruct the terminal device to switch from the first communication mode to the second communication mode by modifying some information or rules in the existing MAC CE signaling or DCI signaling.

[0312] Optionally, this embodiment further includes step 203.

[0313] Step 203: The terminal device receives the first indication information.

[0314] In this embodiment, the terminal device receives the first instruction information sent by the network device and determines the designated TCI-state for communicating with the network device based on the content of the first instruction information. The first instruction information instructs the terminal device to use the designated TCI-state to communicate with the network device.

[0315] It can be understood that after the terminal device receives the first indication information sent by the network device, it will feedback confirmation information to the network device, so that the network device can confirm that the terminal device has received the first indication information based on the confirmation information, and confirm that the network device and the terminal device will use the specified TCI-state to communicate.

[0316] In an optional implementation, when the terminal device operates in the first communication mode, after the terminal device receives the first indication information, it can determine to switch from the first communication mode to the second communication mode according to the first indication information.

[0317] In this optional implementation, optionally, a valid condition for the terminal device to switch from the first communication mode to the second communication mode is:

[0318] After the first time period, the terminal device receives the first indication information and feeds back confirmation information to the network device.

[0319] It is understood that after receiving the first indication information, the terminal device switches from the first communication mode to the second communication mode and needs to inform the network device that the mode switch has been completed. Therefore, after receiving the first indication information, the terminal device will provide a confirmation message to the network device. After receiving the confirmation message from the terminal device, the network device confirms that the terminal device has switched to the second communication mode and communicates with the terminal device based on the rules of the second communication mode.

[0320] If the first MAC CE signaling only activates one TCI-state, the network device does not need to send a third DCI signaling indication to further instruct the terminal device which TCI-state to use. In this case, optionally, the effective condition for the terminal device to switch from the first communication mode to the second communication mode is after the first time period after the terminal device receives the MAC CE signaling and feeds back a confirmation message.

[0321] If the first MAC CE signaling activates multiple TCI-states, the network device needs to further send a third DCI signaling indication to instruct the terminal device which TCI-state to use. In this case, optionally, the first indication information is carried in the first MAC CE signaling and the third DCI signaling, and the third DCI signaling instructs the terminal device to use the first beam to communicate with a single transmission node. At this time, optionally, the effective condition for the terminal device to switch from the first communication mode to the second communication mode is after the second time period when the terminal device receives the third DCI signaling and feeds back a confirmation message.

[0322] In another optional implementation, when the terminal device operates in the second communication mode, the terminal device determines the beam information with the single transmission node based on the first indication information.

[0323] In this implementation, a terminal device communicates with a single transmission node and maintains only one beam. The network device uses first indication information to indicate to the terminal device the beam information for communicating with the single transmission node. Based on this information, the terminal device determines the beam information for communicating with the single transmission node based on the first indication information and communicates with the network device solely based on this beam information.

[0324] Optionally, this embodiment further includes step 204.

[0325] Step 204: The terminal device determines the first beam according to the first indication information.

[0326] In this embodiment, the first indication information instructs the terminal device to use a specified TCI-state to communicate with the network device. After receiving the first indication information, the terminal device can determine to use a specified first beam to communicate with the network device according to the first indication information.

[0327] In an optional implementation, if the first indication information is carried in the first MAC CE signaling and the third DCI signaling, the terminal device receives the first indication information, including one or more of the following:

[0328] The terminal device determines, according to the first MAC CE signaling, activated TCI-states for communicating with a single transmission node;

[0329] When the terminal device operates in the first communication mode, the terminal device switches from the first communication mode to the second communication mode according to the first MAC CE signaling and / or the third DCI signaling;

[0330] The terminal device determines the first beam based on the third DCI.

[0331] In this implementation, if the first MAC CE signaling only activates one TCI-state, the network device does not need to send a third DCI indication to further instruct the terminal device which TCI-state to use.

[0332] When the terminal device operates in the first communication mode, the first MAC CE signaling can instruct the terminal device to switch from the first communication mode to the second communication mode, and can also indicate a TCI-state for communication with a single transmission node.

[0333] When the terminal device operates in the second communication mode, the first MAC CE signaling indicates a TCI-state for communication with a single transmission node.

[0334] In this implementation, if the first MAC CE signaling activates multiple TCI-states, the network device needs to further send a third DCI signaling indication to instruct the terminal device which TCI-state to use. In this case, the first indication information is carried in the first MAC CE signaling and the third DCI signaling.

[0335] When the terminal device operates in the first communication mode, the first MAC CE signaling can instruct the terminal device to switch from the first communication mode to the second communication mode, or activate multiple TCI-states associated with a single transmission node, and the third DCI signaling instructs the terminal device to use the first beam to communicate with a single transmission node.

[0336] When the terminal device operates in the second communication mode, the first MAC CE signaling activates multiple TCI-states, and the third DCI instructs the terminal device to communicate with a single transmission node using the first beam.

[0337] Optionally, this embodiment further includes step 204a, which can be performed before or after step 204.

[0338] Step 204a: The terminal device determines to switch from the first communication mode to the second communication mode according to the third indication information.

[0339] The terminal device operates in the first communication mode. After the terminal device receives the third indication information, it can determine to switch from the first communication mode to the second communication mode according to the third indication information.

[0340] In this optional implementation, optionally, a valid condition for the terminal device to switch from the first communication mode to the second communication mode is:

[0341] After the first time period, the terminal device receives the third indication information and feeds back confirmation information to the network device.

[0342] Optionally, this embodiment further includes step 205.

[0343] Step 205: The terminal device measures the CSI-RS according to the first beam to obtain a measurement result.

[0344] In this embodiment, after the terminal device determines to use the first beam to communicate with the network device based on the first indication information, it can select a corresponding operation mode based on the type of reference signal or channel. When the reference signal is a CSI-RS, the terminal device measures the CSI-RS based on the first beam to obtain a measurement result.

[0345] When the reference signal is a CSI-RS, the network device sends first configuration information to the terminal device. Based on this, in an optional implementation, the method in which the terminal device measures the reference signal according to the first beam includes:

[0346] The terminal device determines a first CSI-RS set associated with the first beam from multiple CSI-RS sets;

[0347] The terminal device only measures the first CSI-RS set to obtain a first measurement result.

[0348] In this implementation, after the terminal device measures only the reference signal indicated to use the first beam, assuming that the first beam corresponds to the first TCI-state, the terminal device does not measure the CSI-RS set (CSI-RS resource set) associated with the second or other TCI-state, but only measures the CSI-RS set (CSI-RS resource set) associated with the first TCI-state. It can also be understood that the terminal device does not expect the network device to trigger the CSI-RS set associated with the second or other TCI-state. Alternatively, the terminal device does not expect to measure the CSI-RS set (CSI-RS resource set) associated with the second or other TCI-state.

[0349] When the terminal device measures the CSI-RS indicated to use the first beam according to the first indication information, the terminal device will first determine the first CSI-RS set associated with the first beam from multiple CSI-RS sets. Then, the terminal device only measures the first CSI-RS set associated with the first beam, and does not measure the CSI-RS set (CSI-RS resource set) associated with the second or other TCI-states.

[0350] Optionally, the terminal device determines a first CSI-RS set associated with the first beam from multiple CSI-RS sets; the terminal device measures only the first CSI-RS set to obtain a first measurement result, which may be effective in one or more of the following scenarios or conditions:

[0351] When the terminal device operates in the first communication mode, the terminal device receives first indication information sent by the network device;

[0352] When the terminal device operates in the second communication mode, the terminal device receives any one or more of the first, third, and fourth configuration information sent by the network device;

[0353] When the terminal device operates in the second communication mode, after the terminal device receives any one or more of the first, third, and fourth configuration information sent by the network device, and before the terminal device receives new beam indication information, the beam indication information includes multi-beam information between the terminal device and the multiple transmission nodes;

[0354] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, the network device configures the terminal device with the relevant configuration parameters for TCI-state selection through RRC signaling;

[0355] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device instructs the terminal device to operate in the first communication mode;

[0356] When the terminal device is instructed to communicate with the network device using one beam or TCI-state, but the network device configures the terminal device's reference signal or channel to be transmitted according to one or both of the two instructed TCI-states;

[0357] When the terminal device receives any one or more of the first, third, and fourth configuration information of the network device, and receives the first indication information and / or the second indication information sent by the network device.

[0358] It is understandable that in order to reduce waste of resources, after the terminal device is instructed to use only the first beam to measure the reference signal, it does not measure the reference signals associated with other beams or TCI-states to save resources.

[0359] It can also be understood that the terminal device ignores the relevant configuration parameters of the TCI-state selection configured by the network device RRC, and the terminal device only uses the indicated first beam to receive and measure the reference signal.

[0360] It can also be understood that the terminal device ignores the relationship between one or more CSI-RS sets configured by the network device RRC and the indicated first or second joint / DL TCI-state, and the terminal device only uses the indicated first beam to receive and measure the reference signal.

[0361] When the reference signal is a CSI-RS for NCJT channel measurement, the network device sends second configuration information to the terminal device. On this basis, in an optional implementation, when the configuration information includes the second configuration information, the method for the terminal device to measure the reference signal according to the first beam includes:

[0362] The terminal device determines a CSI-RS associated with the first beam from the CSI-RS set;

[0363] The terminal device only measures the CSI-RS associated with the first beam to obtain a third measurement result.

[0364] In this implementation, after the terminal device is measured only for the reference signal indicating the use of the first beam, assuming the first TCI-state corresponding to the first beam, the terminal device does not measure the CSI-RS associated with the second TCI-state, but only measures the CSI-RS of the first TCI-state. Alternatively, it can also be understood that the terminal device does not expect the network device to trigger the CSI-RS set for NCJT channel measurement. Alternatively, the terminal device does not expect to measure the CSI-RS set for NCJT channel measurement. Further, when the RRC does not configure the first or second joint / DL TCI-state indicated for each resource, the terminal device only measures the CSI-RS resources of CSI-RS group 1, and does not measure the CSI-RS resources of CSI-RS group 2. Alternatively, it can also be understood that the terminal device does not expect to measure the CSI-RS resources of CSI-RS group 2.

[0365] When the terminal device is instructed to use the first beam to measure the CSI-RS of NCJT according to the first indication information, the terminal device will first determine the CSI-RS associated with the first beam from the CSI-RS set, and then only measure the CSI-RS associated with the first beam to obtain the third measurement result, without measuring the CSI-RS associated with the second or other TCI-state.

[0366] Optionally, the terminal device determines a CSI-RS associated with the first beam from the CSI-RS set; the terminal device measures only the CSI-RS associated with the first beam to obtain a third measurement result, which may be effective in one or more of the following scenarios or conditions:

[0367] When the terminal device operates in the first communication mode, the terminal device receives first indication information sent by the network device;

[0368] When the terminal device operates in the second communication mode, the terminal device receives any one or more of the second, third, and fourth configuration information sent by the network device;

[0369] When the terminal device operates in the second communication mode, after the terminal device receives any one or more of the second, third, and fourth configuration information sent by the network device, and before the terminal device receives new beam indication information, the beam indication information includes multi-beam information between the terminal device and the multiple transmission nodes;

[0370] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, the network device configures the terminal device with the relevant configuration parameters for TCI-state selection through RRC signaling;

[0371] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device instructs the terminal device to operate in the first communication mode;

[0372] When the terminal device is instructed to communicate with the network device using one beam or TCI-state, but the network device configures the terminal device's reference signal or channel to be transmitted according to one or both of the two instructed TCI-states;

[0373] When the terminal device receives any one or more of the second, third, and fourth configuration information of the network device, and receives the first indication information and / or the second indication information sent by the network device.

[0374] It is understandable that in order to reduce waste of resources, after the terminal device is instructed to use only the first beam to measure the reference signal, it does not measure the reference signals associated with other beams or TCI-states to save resources.

[0375] It can also be understood that the terminal device ignores the relevant configuration parameters of the TCI-state selection configured by the network device RRC, and the terminal device only uses the indicated first beam to receive and measure the reference signal CSI-RS.

[0376] It can also be understood that the terminal device ignores the relationship between one or more CSI-RSs configured by the network device RRC and the indicated first or second joint / DL TCI-state, and the terminal device only uses the indicated first beam to receive and measure the reference signal CSI-RS.

[0377] Optionally, this embodiment further includes step 206.

[0378] Step 206: The terminal device reports the measurement result to the network device.

[0379] In this embodiment, after the terminal device uses the first beam to measure the reference signal, the terminal device reports the measurement result to the terminal device. The reported measurement result varies depending on the reference signal.

[0380] When the reference signal is CSI-RS, the terminal device performs measurement and reporting according to the first configuration information. The first configuration information instructs the terminal device to report the second measurement results of K groups of CSI-RS, where K is greater than or equal to 0. The second measurement result of each group of CSI-RS includes at least two CSI-RSs, and the at least two CSI-RSs come from different CSI-RS sets.

[0381] Corresponding to this embodiment, in an optional implementation manner, the terminal device only reports the first measurement result.

[0382] In this implementation, the first measurement result is the result of the terminal device measuring only the first CSI-RS set. The first measurement result includes the second measurement results of M CSI-RSs, and the second measurement results of the M CSI-RSs are all from the first CSI-RS set, and M is greater than or equal to 0. Specifically, the terminal device may only report the second measurement results of M CSI-RSs and the corresponding reference signal received power (RSRP) strength, or the second measurement results of M CSI-RSs, the corresponding RSRP strength and the capability parameter (set) index Capability[Set]Index, that is, no CSI-RS resource pair is reported. Alternatively, the second measurement results of the M CSI-RSs all correspond to the CSI-RS set associated with the first TCI-state. Among them, M can be configured by the network device to indicate the number of resources reported by the terminal device. Alternatively, it can be specified based on the protocol for communication between the network device and the terminal device. Alternatively, M can be 0, indicating that the terminal device does not report.

[0383] The value and configuration of M can be set based on actual needs. In this embodiment, K can be equal to M. This can be understood as M and K being configured with the same value, or as the protocol specifying that M be equal to K. K can also be different from M, with the network device configuring the values ​​of K and M separately.

[0384] Optionally, the first measurement result may be reported under one or more of the following scenarios or conditions:

[0385] When the terminal device operates in the first communication mode, the terminal device receives first indication information sent by the network device;

[0386] When the terminal device operates in the second communication mode, the terminal device receives any one or more of the first, third, and fourth configuration information sent by the network device;

[0387] When the terminal device operates in the second communication mode, after the terminal device receives any one or more of the first, third, and fourth configuration information sent by the network device, and before the terminal device receives new beam indication information, the beam indication information includes multi-beam information between the terminal device and the multiple transmission nodes;

[0388] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, the network device configures the terminal device with the relevant configuration parameters for TCI-state selection through RRC signaling;

[0389] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device instructs the terminal device to operate in the first communication mode;

[0390] When the terminal device is instructed to communicate with the network device using one beam or TCI-state, but the network device configures the terminal device's reference signal or channel to be transmitted according to one or both of the two instructed TCI-states;

[0391] When the terminal device receives any one or more of the first, third, and fourth configuration information of the network device, and receives the first indication information and / or the second indication information sent by the network device.

[0392] When the reference signal is a CSI-RS for NCJT channel measurement, the terminal device performs measurement reporting according to the second configuration information, and the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of a CSI-RS resource pair.

[0393] Corresponding to this embodiment, in an optional implementation manner, the terminal device only reports the third measurement result.

[0394] In this implementation, the third measurement result is the result of the terminal device measuring only the CSI-RS associated with the first beam. That is, the terminal device only reports the measurement result of the CSI-RS associated with the first TCI-state, that is, only reports the single CSI-RS associated with the first TCI-state. Alternatively, it can be understood that the terminal device does not report NCJT CSI, nor does it report the CSI of the single transmission node of the CSI-RS associated with the second or other TCI-state.

[0395] Assuming the first TCI-state corresponding to the first beam, the specific reporting method is as follows:

[0396] When csi-ReportMode is configured as Mode1 and numberOfSingleTRP-CSI-Mode1 is configured as X=0, the terminal device does not perform any reporting, that is, it does not perform NCJT CSI reporting or single transmission node CSI reporting.

[0397] When csi-ReportMode is configured as Mode1 and numberOfSingleTRP-CSI-Mode1 is configured as X=1, the terminal device only reports the CSI of the single transmission node associated with the CSI-RS of the first TCI-state, and reports the corresponding 1 CRI, 1 RI, 1 PMI, and 1 CQI; or 1 CRI, 1 RI, 1 LI, 1 PMI, and 1 CQI. That is, the terminal device neither performs NCJT CSI reporting nor chooses to report the CSI of the single transmission node associated with the CSI-RS of the second TCI-state.

[0398] When csi-ReportMode is Mode1 and the configured numberOfSingleTRP-CSI-Mode1 is X=2, the terminal device only reports the CSI of a single transmission node associated with the CSI-RS of the first TCI-state, and reports the corresponding 1 CRI, 1 RI, 1 PMI, and 1 CQI; or, 1 CRI, 1 RI, 1 LI, 1 PMI, and 1 CQI. In other words, the terminal device neither performs NCJT CSI reporting nor needs to report the CSI of a single transmission node associated with the CSI-RS of the second TCI-state.

[0399] When csi-ReportMode is Mode2, the terminal device only reports the CSI of a single transmission node associated with the CSI-RS of the first TCI-state, and reports the corresponding 1 CRI, 1 RI, 1 PMI, and 1 CQI; or 1 CRI, 1 RI, 1 LI, 1 PMI, and 1 CQI. That is, the terminal device neither performs NCJT CSI reporting nor chooses to report the CSI of a single transmission node associated with the CSI-RS of the second TCI-state.

[0400] Optionally, when SharedCMR is not configured for a terminal device, and all CSI-RS associated with the first TCI-state belong to one or two CSI-RS resource pairs, that is, all CSI-RS that can report the CSI of a single transmission node are associated with the second TCI-state, then the terminal device may not report. Of course, it is also possible to configure or specify that the terminal device report the CSI of a single transmission node associated with the CSI-RS of the first TCI-state.

[0401] Furthermore, the terminal device needs to determine whether the reported PMI is selected from type1-SinglePanel-Group1 or type1-SinglePanel-Group2 based on whether the CSI-RS associated with the first TCI-state belongs to CSI-RS group 1 or CSI-RS group 2. When the CSI-RS associated with the first TCI-state belongs to CSI-RS group 1, the reported PMI belongs to type1-SinglePanel-Group1; when the CSI-RS associated with the first TCI-state belongs to CSI-RS group 2, the reported PMI belongs to type1-SinglePanel-Group2.

[0402] Optionally, the second measurement result may be reported under one or more of the following scenarios or conditions:

[0403] When the terminal device operates in the first communication mode, the terminal device receives first indication information sent by the network device;

[0404] When the terminal device operates in the second communication mode, the terminal device receives any one or more of the second, third, and fourth configuration information sent by the network device;

[0405] When the terminal device operates in the second communication mode, after the terminal device receives any one or more of the second, third, and fourth configuration information sent by the network device, and before the terminal device receives new beam indication information, the beam indication information includes multi-beam information between the terminal device and the multiple transmission nodes;

[0406] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, the network device configures the terminal device with the relevant configuration parameters for TCI-state selection through RRC signaling;

[0407] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device instructs the terminal device to operate in the first communication mode;

[0408] When the terminal device is instructed to communicate with the network device using one beam or TCI-state, but the network device configures the terminal device's reference signal or channel to be transmitted according to one or both of the two instructed TCI-states;

[0409] When the terminal device receives any one or more of the second, third, and fourth configuration information of the network device, and receives the first indication information and / or the second indication information sent by the network device.

[0410] Step 207: The network device receives the measurement result from the terminal device.

[0411] It should be noted that the above-mentioned measurement and reporting rules mentioned in this embodiment can be specified through the communication protocol between the network device and the terminal device, or can be configured through RRC signaling, or set in other ways, and are not limited here.

[0412] After the terminal device is instructed to use the designated first beam to measure the reference signal based on the first indication information, the terminal device can use the above-mentioned fallback rules to measure the reference signal and report the measurement results, ignoring the relevant parameters of the TCI selection configured by RRC.

[0413] (b) Implementation method 2: the reference signal is SRS;

[0414] Please refer to Figure 4, which is another flow diagram of the transmission method provided in an embodiment of the present application. The transmission method can be performed by the terminal device and network device shown in Figure 1a. As shown in Figure 4, the transmission method includes one or more of steps 401 to 406.

[0415] Step 401: The network device sends configuration information to the terminal device.

[0416] In an optional implementation, the configuration information further includes fifth configuration information.

[0417] In this implementation, the fifth configuration information associates multiple beams with multiple SRS sets. Taking two SRS resource sets as an example, it can be understood that the network device configures two SRS resource sets for the terminal device, and the two SRS resource sets are respectively associated with the indicated first or second joint / UL TCI-state.

[0418] In an optional implementation, the configuration information further includes third configuration information.

[0419] In an optional implementation, the configuration information further includes fourth configuration information.

[0420] Optionally, this embodiment further includes step 402. Step 402 may be performed before step 401 or after step 401.

[0421] Step 402: The network device sends first indication information to the terminal device.

[0422] Optionally, this embodiment further includes step 402a, which can be performed before or after step 402.

[0423] Step 402a: The network device sends third indication information to the terminal device.

[0424] Optionally, this implementation further includes step 403.

[0425] Step 403: The terminal device receives the first indication information.

[0426] Optionally, this implementation further includes step 404.

[0427] Step 404: The terminal device determines the first beam according to the first indication information.

[0428] Optionally, this embodiment further includes step 404a, which can be performed before or after step 404.

[0429] Step 404a: The terminal device determines to switch from the first communication mode to the second communication mode according to the third indication information.

[0430] It is understandable that for the detailed description of steps 401 to 404a, please refer to steps 201 to 204a shown in FIG. 2 , and only the relevant implementation method when the reference signal is an SRS is described here.

[0431] Step 405: The terminal device transmits the SRS according to the first beam.

[0432] In this embodiment, after the terminal device receives the first indication information, it determines to use the designated first beam to communicate with a single transmission node of the network device according to the first information.

[0433] It is understood that in one example scenario, a terminal device switches from a first communication mode to a second communication mode according to first indication information, and the terminal device communicates with a single transmission node using a first beam. When the reference signal is an SRS, the terminal device may select resources to transmit only the SRS associated with the first beam, rather than using resources to transmit SRS associated with all transmission nodes, to reduce resource waste.

[0434] In another example scenario, the terminal device operates in the second communication mode, and the terminal device communicates with a single transmission node using a single beam. When the terminal device receives any one or more of the third, fourth, and fifth configuration information, it can be understood that the network device has configured a communication mode with multiple transmission nodes, or configured to use multi-beam communication, or configured multiple SRS sets associated with multiple beams, but the terminal device is only instructed to use one beam. When the reference signal is SRS, the terminal device can use the first beam to send SRS, ignoring the relevant parameters of the TCI selection configured by the RRC.

[0435] In an optional implementation manner, a specific implementation manner in which the terminal device transmits the reference signal according to the first beam includes:

[0436] The terminal device determines an SRS set associated with a first beam from a plurality of SRS sets, and transmits only the SRS set associated with the first beam.

[0437] In this implementation, the terminal device only sends the SRS set associated with the first beam. Assuming that the first beam corresponds to the first TCI-state, it can be understood that the terminal device does not expect the network device to trigger a semi-persistent SRS resource set (Semi-Persistent SRS resource set) or aperiodic SRS resource set associated with the second or other TCI-state, or the terminal device does not expect to send a periodic SRS set associated with the second or other TCI-state.

[0438] Optionally, the terminal device may transmit the SRS according to the first beam when one or more of the following scenarios or conditions are met:

[0439] When the terminal device operates in the first communication mode, the terminal device receives first indication information sent by the network device;

[0440] When the terminal device operates in the second communication mode, the terminal device receives any one or more of the third, fourth, and fifth configuration information sent by the network device;

[0441] When the terminal device operates in the second communication mode, after the terminal device receives any one or more of the third, fourth, and fifth configuration information sent by the network device, and before the terminal device receives new beam indication information, the beam indication information includes multi-beam information between the terminal device and the multiple transmission nodes;

[0442] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, the network device configures the terminal device with the relevant configuration parameters for TCI-state selection through RRC signaling;

[0443] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device instructs the terminal device to operate in the first communication mode;

[0444] When the terminal device is instructed to communicate with the network device using one beam or TCI-state, but the network device configures the terminal device's reference signal or channel to be transmitted according to one or both of the two instructed TCI-states;

[0445] When the terminal device receives any one or more of the third, fourth, and fifth configuration information of the network device, and receives the first indication information and / or the second indication information sent by the network device.

[0446] In step 406, the network device receives a set of SRSs associated with the first beam.

[0447] It should be noted that the SRS sending rules mentioned in this embodiment can be specified by the communication protocol between the network device and the terminal device, or can be configured by RRC signaling, or set in other ways, which is not limited here.

[0448] After the terminal device is instructed to use the designated first beam to send SRS based on the first indication information, the terminal device can use the above-mentioned fallback rule to send SRS reporting and ignore the relevant parameters of the TCI selection configured by RRC.

[0449] (c) Implementation method 3: The channel is a PDSCH scheduled in the first DCI format;

[0450] Please refer to Figure 5, which is another flow chart of the transmission method provided in an embodiment of the present application. The transmission method can be executed by the terminal device and network device shown in Figure 1a. As shown in Figure 5, the transmission method includes steps 501 to 506.

[0451] Step 501: The network device sends configuration information to the terminal device. In an optional implementation, the configuration information further includes third configuration information.

[0452] In an optional implementation, the configuration information further includes fourth configuration information.

[0453] Optionally, this embodiment further includes step 502. Step 502 may be performed before or after step 501. In step 502, the network device sends first indication information to the terminal device.

[0454] Optionally, this embodiment further includes step 502a, which can be performed before or after step 502.

[0455] Step 502a: The network device sends third indication information to the terminal device.

[0456] Optionally, this implementation further includes step 503.

[0457] Step 503: The terminal device receives the first indication information.

[0458] Optionally, this implementation further includes step 504. In step 504, the terminal device determines the first beam according to the first indication information.

[0459] Optionally, this embodiment further includes step 504a, which can be performed before or after step 504.

[0460] Step 504a: The terminal device determines to switch from the first communication mode to the second communication mode according to the third indication information.

[0461] It is understandable that for the detailed description of steps 501 to 504 , please refer to steps 201 to 204 shown in FIG. 2 , which will not be repeated here.

[0462] Step 505: The terminal device receives a first DCI from the network device.

[0463] In this embodiment, after the terminal device determines the first beam according to the first indication information, the terminal device will receive a first DCI from the network device, and the first DCI is used to schedule PDSCH.

[0464] In an optional implementation, the terminal device uses a first beam to receive a PDSCH scheduled by a first DCI format.

[0465] In this implementation, after the terminal device determines the first beam according to the first indication information, the terminal device receives the PDSCH scheduled by the first DCI format according to the first beam indicated in the first indication information.

[0466] Corresponding to actual operations, this implementation method generally corresponds to PDSCH scheduled by DCI 1_1 / 1_2 without the TCI selection field. Assume that when the terminal device is in the first communication mode, the terminal device uses the two indicated joint / DL TCI-states to receive the PDSCH. After the terminal device receives the first indication information sent by the network device, the terminal device can use the first beam indicated by the first indication information to receive the PDSCH.

[0467] In another optional implementation, the first DCI includes a first field, the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses a first beam to receive PDSCH. The terminal device uses the first beam to receive PDSCH scheduled by the first DCI format.

[0468] This implementation generally corresponds to a PDSCH scheduled by DCI 1_1 / 1_2 with a TCI selection field. In the first communication mode, it is assumed that the network device uses the first field to indicate whether the first or second joint / DL TCI-state is used for the currently scheduled PDSCH. When the terminal device receives the first indication information sent by the network device, the terminal device can use the information indicated by the first field to perform the corresponding operation.

[0469] Optionally, the first field is the TCI selection field.

[0470] The network device indicates whether the scheduled PDSCH uses the first, second, or two joint / DL TCI-states based on the TCI selection field 00 / 01 / 10. When any one or more of the following conditions 1-7 are met, the terminal device can use one or more of the following methods to process the TCI selection field:

[0471] The network device may set the TCI selection field to 11 to indicate that the terminal device is in the second communication mode, or to indicate that the terminal device has switched from the first communication mode to the second communication mode.

[0472] Alternatively, after the terminal device switches to the second communication mode according to the first indication information, the terminal device is constrained not to parse the field, or considers the field to be meaningless.

[0473] Alternatively, the field is constrained to be "00" or "01" in the protocol for communication between the terminal device and the communication device, and must correspond to whether the first indication information activates the first TCI-state or the second TCI-state.

[0474] The conditions 1-7 are:

[0475] Condition 1: When the terminal device operates in the first communication mode, the terminal device receives first indication information sent by the network device;

[0476] Condition 2: When the terminal device operates in the second communication mode, the terminal device receives one or more of the third and fourth configuration information sent by the network device;

[0477] Condition 3: When the terminal device operates in the second communication mode, after the terminal device receives any one or more of the third and fourth configuration information sent by the network device, and before the terminal device receives new beam indication information, the beam indication information includes multi-beam information between the terminal device and multiple transmission nodes;

[0478] Condition 4: When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device configures the terminal device with the relevant configuration parameters for TCI-state selection through RRC signaling;

[0479] Condition 5: When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device instructs the terminal device to operate in the first communication mode;

[0480] Condition 6: When the terminal device is instructed to communicate with the network device using one beam or TCI-state, but the network device configures the terminal device's channel or reference signal to be transmitted according to one or both of the two instructed TCI-states;

[0481] Condition 7: When the terminal device receives any one or more of the third and fourth configuration information of the network device, and receives the first indication information and / or the second indication information sent by the network device.

[0482] It is understandable that the terminal device can set the rule for the first field according to actual needs and is not limited here.

[0483] In another optional implementation, the type of the PDSCH is the PDSCH scheduled by the first DCI 1_0.

[0484] In this implementation, the specific method for the terminal device to receive the PDSCH scheduled in the DCI 1_0 format is:

[0485] After the terminal device receives the first indication information sent by the network device, the terminal device receives the PDSCH scheduled by the first DCI 1_0 format according to the first beam indicated in the first indication information.

[0486] When any one or more of the above conditions 1-7 are met, in the protocol for communication between the network device and the terminal device, the network device can be constrained not to schedule PDSCH associated with an unactivated TCI-state or associated with two joint / UL TCI-states. For example, assuming that the first beam corresponds to the first TCI-state, when the terminal device switches to the second communication mode, the first indication information sent by the network device activates the first TCI-state, then the terminal device does not expect to be scheduled by the network device for PDSCH associated with the second or other TCI-states, and the terminal device does not expect to be scheduled by the network device for PDSCH associated with two joint / UL TCI-states. For another example, when the network device operates in the second communication mode, a single beam is used to communicate with the network device. When the network device sends an RRC configuration to operate in the first communication mode, or sends an RRC configuration PDSCH associated with the first, second or two joint / DL TCI-states, before receiving the multi-beam indication signaling, the terminal device uses the first beam indicated in the first indication information to receive the PDSCH scheduled in the first DCI 1_0 format.

[0487] Step 506: The terminal device uses the first beam to receive the PDSCH scheduled in the first DCI format from the network device.

[0488] In this embodiment, the terminal device receives a PDSCH scheduled in the first DCI format from the network device using the first beam. Assuming a first TCI-state corresponding to the first beam, the protocol for communication between the network device and the terminal device can constrain the terminal device from expecting to receive a PDSCH scheduled in the first DCI format using the second or other TCI-states.

[0489] Optionally, the terminal device may use the first beam to receive the PDSCH scheduled in the first DCI format under one or more of the following scenarios or conditions:

[0490] When the terminal device operates in the first communication mode, the terminal device receives first indication information sent by the network device;

[0491] When the terminal device operates in the second communication mode, the terminal device receives any one or more of the third and fourth configuration information sent by the network device;

[0492] When the terminal device operates in the second communication mode, after the terminal device receives any one or more of the third and fourth configuration information sent by the network device, and before the terminal device receives new beam indication information, the beam indication information includes multi-beam information between the terminal device and the multiple transmission nodes;

[0493] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, the network device configures the terminal device with the relevant configuration parameters for TCI-state selection through RRC signaling;

[0494] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device instructs the terminal device to operate in the first communication mode;

[0495] When the terminal device is instructed to communicate with the network device using one beam or TCI-state, but the network device configures the terminal device's reference signal or channel to be transmitted according to one or both of the two instructed TCI-states;

[0496] When the terminal device receives any one or more of the third and fourth configuration information of the network device, and receives the first indication information and / or the second indication information sent by the network device.

[0497] (d) Implementation method 4: the channel is the PUSCH scheduled by the second DCI;

[0498] Please refer to Figure 6, which is another flow diagram of the transmission method provided in an embodiment of the present application. The transmission method can be executed by the terminal device and network device shown in Figure 1a. As shown in Figure 6, the transmission method includes steps 601 to 606.

[0499] Step 601: The network device sends configuration information to the terminal device.

[0500] In an optional implementation, the configuration information further includes third configuration information.

[0501] In an optional implementation, the configuration information further includes fourth configuration information.

[0502] Optionally, this embodiment further includes step 602. Step 602 may be performed before step 601 or after step 601.

[0503] In step 602, the network device sends first indication information to the terminal device. Optionally, this embodiment further includes step 602a. Step 602a can be performed before or after step 602.

[0504] Step 602a: The network device sends third indication information to the terminal device.

[0505] Optionally, this implementation further includes step 603.

[0506] Step 603: The terminal device receives the first indication information.

[0507] Optionally, this implementation further includes step 604.

[0508] Step 604: The terminal device determines the first beam according to the first indication information.

[0509] Optionally, this embodiment further includes step 604a, which can be performed before or after step 604.

[0510] Step 604a: The terminal device determines to switch from the first communication mode to the second communication mode according to the third indication information.

[0511] It is understandable that for the detailed description of steps 601 to 604 , please refer to steps 201 to 204 shown in FIG. 2 , which will not be repeated here.

[0512] Step 605: The terminal device receives a second DCI from the network device.

[0513] In this embodiment, after the terminal device determines the first beam according to the first indication information, the terminal device will receive a second DCI from the network device, and the second DCI is used to schedule PUSCH.

[0514] Optionally, the terminal device uses the first beam to send a PUSCH scheduled in the second DCI format.

[0515] After the terminal device determines the first beam according to the first indication information, the terminal device sends the PUSCH scheduled by the second DCI format according to the first beam indicated in the first indication information.

[0516] In an optional implementation manner, the type of the PUSCH is a PUSCH scheduled by the second DCI 0-0.

[0517] In this implementation, when the terminal device operates in the first communication mode, the PUSCH scheduled by DCI 0-0 generally uses the first TCI-state by default. When any one or more of the above conditions 1-7 are met, the first beam in the first indication information can be used for transmission. Optionally, when the first indication information sent by the network device activates the second TCI-state, then in the communication protocol between the network device and the terminal device, the terminal device can be constrained to not expect to be scheduled by DCI 0-0 for PUSCH.

[0518] In another optional implementation, the second DCI includes a second field, and the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send PUSCH.

[0519] In this implementation, when the terminal device operates in the first communication mode, it generally corresponds to the PUSCH scheduled by the second DCI 0-1 / 0-2, and the TCI-state used by the currently scheduled PUSCH is generally indicated by the second field in the second DCI. After the terminal device receives the first indication information sent by the network device, the terminal device can use the information indicated by the second field to perform the corresponding operation.

[0520] Optionally, the second field is SRS resource set indicator.

[0521] The network device indicates that the PUSCH scheduled this time is sent using the 1st / 2nd / both TCI-state based on the SRS resource set indicator. When any one or more of the above conditions 1-7 are met, the terminal device can use the following methods to process the SRS resource set indicator field.

[0522] The network device may set the SRS resource set indicator field to a specific value, that is, add a new field to indicate that the terminal device is in the second communication mode, or to indicate that the terminal device has switched from the first communication mode to the second communication mode.

[0523] Alternatively, the field may be constrained to be "00" or "01" in the protocol for communication between the terminal device and the communication device, and must correspond to whether the first indication information activates the first TCI-state or the second TCI-state.

[0524] Alternatively, after the terminal device switches to the second communication mode according to the first indication information, the terminal device is constrained not to parse the field, or considers the field to be meaningless.

[0525] It is understandable that the terminal device can set the rule for the first field according to actual needs and is not limited here.

[0526] In another optional implementation, the PUSCH type is Type 1 CG-PUSCH.

[0527] In this implementation, when the terminal device operates in the first communication mode, the general network device configures the Type 1 CG-PUSCH through RRC to indicate the first, second or two joint / UL TCI-states to be sent. When any one or more of the above conditions 1-7 are met, the terminal device can be constrained in the protocol for communication between the network device and the terminal device to no longer send Type 1 CG-PUSCH associated with an inactivated TCI-state or associated with two joint / UL TCI-states. Or it can be understood that the terminal device does not expect to be scheduled by the network device to be associated with an inactivated TCI-state or associated with two joint / UL TCI-states.

[0528] Step 606: The terminal device uses the first beam to send a PUSCH scheduled in the second DCI format to the network device.

[0529] In this embodiment, the terminal device transmits a PUSCH scheduled in the second DCI format from the network device using the first beam. Assuming a first TCI-state corresponding to the first beam, the protocol for communication between the network device and the terminal device may constrain the terminal device from transmitting a PUSCH scheduled in the second DCI format using the second or other TCI-states.

[0530] Optionally, the terminal device may use the first beam to send a PUSCH scheduled in the second DCI format to the network device under one or more of the following scenarios or conditions:

[0531] When the terminal device operates in the first communication mode, the terminal device receives first indication information sent by the network device;

[0532] When the terminal device operates in the second communication mode, the terminal device receives any one or more of the third and fourth configuration information sent by the network device;

[0533] When the terminal device operates in the second communication mode, after the terminal device receives any one or more of the third and fourth configuration information sent by the network device, and before the terminal device receives new beam indication information, the beam indication information includes multi-beam information between the terminal device and the multiple transmission nodes;

[0534] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, the network device configures the terminal device with the relevant configuration parameters for TCI-state selection through RRC signaling;

[0535] When the terminal device is instructed to communicate with the network device using a beam or TCI-state, but the network device instructs the terminal device to operate in the first communication mode;

[0536] When the terminal device is instructed to communicate with the network device using one beam or TCI-state, but the network device configures the terminal device's reference signal or channel to be transmitted according to one or both of the two instructed TCI-states;

[0537] When the terminal device receives any one or more of the third and fourth configuration information of the network device, and receives the first indication information and / or the second indication information sent by the network device.

[0538] Please refer to Figure 7, which is another flow chart of the transmission method provided in an embodiment of the present application. The transmission method can be executed by the terminal device and network device shown in Figure 1a. As shown in Figure 7, the transmission method includes steps 701 to 705.

[0539] Step 701: The network device sends configuration information to the terminal device.

[0540] In this embodiment, the specific content of the configuration information can be found in the specific description of step 201 shown in FIG. 2 , and will not be repeated here.

[0541] In an optional implementation, the configuration information includes sixth configuration information.

[0542] The sixth configuration information is used to configure the channel / reference signal-related configuration of the terminal device operating in the second communication mode. The channel can be one or more of PDSCH, PDCCH, PUCCH, and PUSCH; the reference signal can be one or more of synchronization signal-broadcast channel measurement resource block (Synchronization Signal and PBCH Block, SSB), CSI-RS, and SRS.

[0543] Optionally, the sixth configuration information is further used to instruct the terminal device to operate in the second communication mode, that is, to instruct the terminal device to communicate with the network device through a single transmission node.

[0544] In another optional implementation, the configuration information may further include seventh configuration information.

[0545] When the terminal device operates in the first communication mode, the seventh configuration information is used to instruct the terminal device to switch from the first communication mode to the second communication mode.

[0546] Optionally, the seventh configuration information further configures the channel / resource configuration and reporting configuration of the terminal device operating in the second communication mode.

[0547] Optionally, the seventh configuration information may also release the configuration parameters for TCI selection, that is, there is no need to configure the terminal device to operate in different reference signals or channels using the first or second joint / DL / UL TCI-state.

[0548] Optionally, the first communication mode is MTRP and the second communication mode is STRP.

[0549] Optionally, this embodiment further includes step 702. Step 702 may be performed before step 701 or after step 701.

[0550] Step 702: The network device sends third indication information to the terminal device.

[0551] In this embodiment, the third indication information can be used to indicate beam information for communicating with multiple transmission nodes, and the beam information is used to instruct the terminal device to use the indicated beam to communicate with the network device through multiple transmission nodes.

[0552] In a possible implementation manner, the third indication information is carried in a third MAC CE signaling.

[0553] In this implementation, the third MAC CE signaling is used to activate one or more groups of TCI-states corresponding to multiple transmission nodes.

[0554] Optionally, when the terminal device operates in the second communication mode, the third MAC CE signaling is used to activate one or more groups of TCI-states, and the one or more groups of TCI-states activated by the third MAC CE signaling include TCI-states associated with multiple transmission nodes, implicitly instructing the terminal device to switch to the first communication mode.

[0555] Optionally, when the terminal device operates in the second communication mode, the third MAC CE signaling may include a field that explicitly indicates that the terminal device switches from the second communication mode to the first communication mode.

[0556] Optionally, when the terminal device operates in the first communication mode, the third MAC CE signaling activates one or more groups of TCI-states associated with multiple transmission nodes.

[0557] In another possible implementation manner, the third indication information is carried in the third MAC CE signaling and the fifth DCI signaling.

[0558] In this implementation, if the third MAC CE signaling activates multiple groups of TCI-states, the network device needs to further issue a fourth DCI indication to instruct the terminal device which group of TCI-states in the multiple groups of TCI-states to use to communicate with each of the multiple transmission nodes. In this case, the third indication information is carried in the third MAC CE signaling and the fifth DCI signaling. The fifth DCI signaling instructs the terminal device to use the first group of TCI-states to communicate with each of the multiple transmission nodes. The first group of TCI-states belongs to one of the multiple groups of TCI-states activated by the third MAC CE signaling.

[0559] The third MAC CE signaling activates only one set of TCI-states, which can be understood as corresponding to one code point. This code point contains multiple joint TCI-states corresponding to multiple transmission nodes, or multiple DL TCI-states and multiple UL TCI-states corresponding to multiple transmission nodes.

[0560] The third MAC CE signaling activates multiple groups of TCI-states, which can be understood as the multiple groups of TCI-states corresponding to multiple code points. Optionally, there are multiple joint TCI-states corresponding to multiple transmission nodes in at least one code point, or multiple joint / DL TCI-states and multiple UL TCI-states corresponding to multiple transmission nodes. Optionally, the TCI-states corresponding to multiple code points include TCI-states corresponding to at least two transmission nodes. For example, the first code point includes a joint TCI-state or a joint / DL TCI-state and a UL TCI-state corresponding to the first transmission node, and the second code point includes a joint TCI-state or a joint / DL TCI-state and a UL TCI-state corresponding to the second transmission node.

[0561] Optionally, when the terminal device operates in the second communication mode, the fifth DCI signaling may include a field that explicitly indicates that the terminal device switches from the second communication mode to the first communication mode.

[0562] It is understood that the third MAC CE signaling described above may be a newly defined MAC CE signaling. Alternatively, existing MAC CE signaling may be utilized to activate TCI-states by modifying some information or rules in the MAC CE signaling. The specific form is not limited.

[0563] It is understandable that the fifth DCI signaling may be a newly defined DCI signaling, or may utilize the existing DCI beam indication signaling.

[0564] Optionally, this embodiment further includes step 702a, which can be performed before or after step 702.

[0565] Step 702a: The network device sends third indication information to the terminal device.

[0566] In a possible implementation manner, the third indication information is carried in the third MAC CE signaling or the sixth DCI signaling.

[0567] When the terminal device operates in the second communication mode, the third MAC CE signaling or the sixth DCI signaling may include a field that explicitly indicates that the terminal device switches from the second communication mode to the first communication mode.

[0568] It is understandable that the third MAC CE signaling or the sixth DCI signaling may be a newly defined MAC CE or DCI signaling. Alternatively, the existing MAC CE or DCI signaling may be utilized to explicitly instruct the terminal device to switch from the second communication mode to the first communication mode by modifying some information or rules in the existing MAC CE signaling or DCI signaling.

[0569] Optionally, this implementation further includes step 703.

[0570] Step 703: The terminal device receives the third indication information.

[0571] In this embodiment, the terminal device receives the third instruction information sent by the network device and determines the specified TCI-states for communicating with the network device based on the content of the third instruction information. The third instruction information instructs the terminal device to use the specified TCI-states to communicate with the network device.

[0572] It can be understood that after the terminal device receives the third indication information issued by the network device, it will feedback confirmation information to the network device, so that the network device confirms that the terminal device has received the third indication information based on the confirmation information, and confirms that the network device and the terminal device will use the specified TCI-states to communicate.

[0573] In an optional implementation, when the terminal device operates in the second communication mode, after the terminal device receives the third indication information, it can determine to switch from the second communication mode to the first communication mode according to the third indication information.

[0574] In this optional implementation, optionally, a valid condition for the terminal device to switch from the second communication mode to the first communication mode is:

[0575] After the first time period, the terminal device receives the third indication information and feeds back confirmation information to the network device.

[0576] It is understood that after receiving the third indication information, the terminal device switches from the second communication mode to the first communication mode, and needs to inform the network device that the mode switch has been completed. Therefore, after receiving the third indication information, the terminal device will provide a confirmation message to the network device. After receiving the confirmation message from the terminal device, the network device confirms that the terminal device has switched to the first communication mode and communicates with the terminal device based on the rules of the first communication mode.

[0577] If the third MAC CE signaling activates only one TCI-state, the network device does not need to issue a fourth DCI indication to further instruct the terminal device on which TCI-state of the multiple TCI-states to use for communication with each of the multiple transmission nodes. Optionally, the terminal device switches from the second communication mode to the first communication mode within the first time period after receiving the third MAC CE signaling and feeding back a confirmation message.

[0578] If the third MAC CE signaling activates multiple groups of TCI-states, the network device needs to further issue a fourth DCI indication to indicate to the terminal device which group of TCI-states in the multiple groups of TCI-states to use to communicate with each of the multiple transmission nodes. In this case, optionally, the third indication information includes the third MAC CE signaling and the fourth DCI, and the fourth DCI indicates to the terminal device which group of TCI-states in the multiple groups of TCI-states to use to communicate with each of the multiple transmission nodes. At this time, optionally, the effective condition for the terminal device to switch from the first communication mode to the second communication mode is after the second time period when the terminal device receives the fourth DCI and feeds back a confirmation message.

[0579] In another optional implementation, when the terminal device operates in the first communication mode, the terminal device determines beam information with each transmission node among the multiple transmission nodes based on the third indication information.

[0580] Optionally, this embodiment further includes step 703a, which can be performed before or after step 703.

[0581] Step 703a: The terminal device receives the third indication information.

[0582] When the terminal device operates in the second communication mode, after the terminal device receives the third indication information, it can switch from the second communication mode to the first communication mode according to the third indication information.

[0583] Optionally, this implementation also includes step 704.

[0584] Step 704: The terminal device determines a first group of TCI-states according to the third indication information.

[0585] In this embodiment, the third indication information instructs the terminal device to use the specified TCI-states to communicate with the network device through multiple transmission nodes. After receiving the third indication information, the terminal device can determine to use the specified first group of beams to communicate with the network device based on the third indication information.

[0586] In an optional implementation, when the terminal device operates in the second communication mode, if the third indication information is carried in the third MAC CE signaling and / or the fifth DCI signaling, the terminal device receives the third indication information, including one or more of the following:

[0587] The terminal device determines, according to the third MAC CE signaling, activated TCI-states for communicating with the plurality of transmission nodes;

[0588] The terminal device switches from the second communication mode to the first communication mode according to the third MAC CE signaling and / or the fifth DCI signaling;

[0589] The terminal device determines the first group of beams based on the fifth DCI signaling.

[0590] In this implementation, if the third MAC CE signaling only activates one set of TCI-states, the network device does not need to send a fourth DCI indication to further instruct the terminal device which set of TCI-states to use to communicate with each of the multiple transmission nodes.

[0591] In this implementation, if the third MAC CE signaling activates multiple TCI-states, the network device needs to further issue a fifth DCI signaling indication to instruct the terminal device which TCI-state in the multiple TCI-states to use to communicate with each of the multiple transmission nodes. In this case, the third indication information includes the third MAC CE signaling and the fifth DCI signaling.

[0592] Optionally, in this implementation, the third indication information may instruct the terminal device to switch from the second communication mode to the first communication mode. Optionally, the third indication information is carried in the third MAC CE signaling and / or the fifth DCI signaling, the third MAC CE signaling activates one or more groups of TCI-states, the one or more groups of TCI-states activated by the third MAC CE signaling include TCI-states associated with multiple transmission nodes, and the terminal device may know that the second MAC CE implicitly instructs the terminal device to switch to the first communication mode. Optionally, the third indication information is carried in the third MAC CE signaling and / or the fifth DCI signaling, the third MAC CE signaling and / or the fifth DCI signaling includes a field, which explicitly instructs the terminal device to switch from the second communication mode to the first communication mode, and the terminal device knows that the third indication information explicitly instructs the terminal device to switch to the first communication mode.

[0593] In another optional implementation, when the terminal device operates in the first communication mode, if the third indication information is carried in the third MAC CE signaling and / or the fifth DCI signaling, the terminal device receives the third indication information, including one or more of the following:

[0594] The terminal device determines, according to the third MAC CE signaling, activated TCI-states for communicating with the plurality of transmission nodes;

[0595] The terminal device determines the first group of beams based on the fifth DCI signaling.

[0596] In this implementation, if the third MAC CE signaling only activates one set of TCI-states, the network device does not need to send a fourth DCI indication to further instruct the terminal device which set of TCI-states to use to communicate with each of the multiple transmission nodes.

[0597] In this implementation, if the third MAC CE signaling activates multiple TCI-states, the network device needs to further issue a fifth DCI signaling indication to instruct the terminal device which TCI-state in the multiple TCI-states to use to communicate with each of the multiple transmission nodes. In this case, the third indication information includes the third MAC CE signaling and the fifth DCI signaling.

[0598] Optionally, this embodiment further includes step 704a, which can be performed before or after step 704.

[0599] Step 704a: The terminal device determines to switch from the second communication mode to the first communication mode according to the third indication information.

[0600] The terminal device operates in the second communication mode. After the terminal device receives the third indication information, it can determine to switch from the second communication mode to the first communication mode according to the third indication information.

[0601] In this optional implementation, optionally, a valid condition for the terminal device to switch from the second communication mode to the first communication mode is:

[0602] After the first time period, the terminal device receives the third indication information and feeds back confirmation information to the network device.

[0603] Optionally, this implementation also includes step 705.

[0604] Step 705: The terminal device uses the first beam in the first group of beams to receive or send a reference signal or channel.

[0605] It can be understood that in an example scenario, when the terminal device operates in the second communication mode, a single beam is used to communicate with a transmission node. When the terminal device receives the third indication information, the third indication information indicates the first group of beams (i.e., multiple beam information), and the multiple beam information is used for the terminal device to communicate with multiple transmission nodes, it can implicitly instruct the terminal device to switch from the second communication mode to the first communication mode. At this time, the RRC has not been reconfigured, the terminal device is only configured with the resources of a single transmission node, and can only communicate with a single transmission node using a single beam, but the terminal device is indicated with the first group of beams, then it can be specified by the protocol or configured by the network device, and the terminal device uses the first beam in the first group of beams to receive or send a reference signal or channel.

[0606] In another example scenario, when the terminal device operates in the first communication mode, it uses multiple beams to communicate with multiple transmission nodes. When the terminal device receives the seventh configuration information, the seventh configuration information is used to instruct the terminal device to switch from the first communication mode to the second communication mode, and configure the channel / resource-related configuration of the terminal device operating in the second communication mode. At this time, the terminal device uses a group of beams to communicate with multiple transmission nodes, but the terminal device is only configured with the resources of a single transmission node. In this case, the terminal device can use the first beam in the first group of beams to receive or send a reference signal or channel according to protocol regulations or network device configuration.

[0607] The terminal device uses the first beam in the first group of beams to receive or send a reference signal or channel, which may be effective in one or more of the following scenarios or conditions:

[0608] When the terminal device operates in the first communication mode, the terminal device receives seventh configuration information sent by the network device;

[0609] When the terminal device operates in the first communication mode, after the terminal device receives the seventh configuration information sent by the network device and before the terminal device receives new beam indication information, the beam indication information includes beam information for communication between the terminal device and the single transmission node;

[0610] When the terminal device operates in the second communication mode, the terminal device receives third indication information sent by the network device;

[0611] When the terminal device operates in the second communication mode, the terminal device receives the third indication information and the third indication information sent by the network device;

[0612] When the terminal device is instructed to communicate with the network device using two beams or TCI-states, but the network device releases the TCI-state selection field for the terminal device through RRC signaling;

[0613] When the terminal device is instructed to communicate with the network device using two beams or TCI-state, but the network device instructs the terminal device to operate in the second communication mode;

[0614] When the terminal device is instructed to communicate with the network device using two beams or TCI-states, but the network device configures the terminal device with a single transmission node reference signal or channel;

[0615] When the terminal device receives the sixth configuration information sent by the network device and receives the third indication information sent by the network device;

[0616] When the terminal device receives the sixth configuration information sent by the network device, and receives the third indication information and the third indication information sent by the network device;

[0617] When the terminal device receives the third indication information sent by the network device, and the terminal device receives the seventh configuration information sent by the network device.

[0618] The first beam in the first group of beams can be determined by default as the first beam in the first group of beams associated with the first transmitting node, or any other beam in the first group of beams. The first beam in the first group of beams can correspond to a joint / DL TCI-state for uplink and downlink transmission, or can correspond to a joint / DL TCI-state and a UL TCI-state for downlink and uplink transmission, respectively.

[0619] It is understandable that for ease of explanation, the implementation methods of different reference signals or channels are described separately. In actual application, the transmission methods shown in Figures 2 to 7 can be implemented individually or in combination. The terminal device can adopt different methods for combined implementation according to the specific types of reference signals and channels. It is understandable that in the case of combined implementation, the steps from the network device sending configuration information to the terminal device determining the first beam according to the first indication information are common steps, and corresponding implementation content can be added according to different reference signals or channels, and there is no need to repeat the execution during the combined implementation.

[0620] In addition, R18 currently introduces multi-TA (Timing advance) enhancements for scenarios involving mDCI mTRP, meaning that a service cell can maintain two TAs. For intra-cell MTRP and inter-cell MTRP scenarios, there are multiple beam pair links (BPLs) between the terminal device and the network device. When the propagation paths between the links differ significantly, the terminal device and the network device maintain two TAs to ensure timing synchronization of the uplink transmission of each transmission node (TRP), where each TA is associated with a TAG. In R18, TA / TAG is associated with TCI-state. When a terminal device sends an uplink signal, it can determine the TA value for the uplink transmission based on which TA / TAG the uplink TCI-state is associated with.

[0621] On this basis, after the terminal device is instructed to communicate with the network device based on a single beam or TCI-state according to the first indication information, how the terminal device falls back from multi-TA to single TA maintenance also needs to be solved urgently.

[0622] For ease of explanation, an example is given in which one network device corresponds to one transmission node.

[0623] Since a service cell of the terminal device still has two TAGs, in order to reduce resource waste, the terminal device can stop maintaining the TA / TAG associated with the inactivated TCI-state based on the first indication information.

[0624] Corresponding to the embodiments provided in FIG. 2 to FIG. 7 , in an optional implementation manner, the configuration information further includes eighth configuration information.

[0625] In this implementation, the eighth configuration information is used by the network device to indicate the TA associated with the terminal device. The eighth configuration information includes the association relationship between TCI-state and TAG / TA, TAG information of the serving cell (number of TAGs, TAG ID, etc.), and TA information (Timing Advance Offset, timer duration, etc.).

[0626] In an optional implementation, multiple network devices include a first transmission node and a second transmission node, the first transmission node is associated with a first timing advance TA, the first indication information is used to activate one or several beams associated with the first transmission node, and the one or several beams associated with the first transmission node are all associated with the first TA.

[0627] In this optional implementation, after the transmission node sends the eighth configuration information to the terminal device, the terminal device may configure TA-related information based on the eighth configuration information. After the terminal device receives the first indication information, the terminal device is instructed to use only the specified beam or TCI-state to communicate with the first transmission node. In this case, the terminal device will only use one or more beams associated with the first transmission node to communicate with the first transmission node.

[0628] In an optional implementation, the second transmission node is associated with the second TA, then the terminal device stops the timer of the second TA; the terminal device stops the random access channel (RACH) process with the second TA; the terminal device clears the transmission of the uplink physical channel or uplink reference signal with the second TA; the terminal device clears the HARQ cache corresponding to the second TA.

[0629] In this implementation, after the terminal device receives the first indication information, the terminal device switches from the first communication mode to the second communication mode and communicates with the first transmission node using the first beam. Since the terminal device still has two TAGs in one serving cell, in order to reduce resource waste, the above content can be specified in the communication protocol between the terminal device and the first transmission node, so that the terminal device stops maintaining the TA / TAG associated with the inactivated TCI-state.

[0630] In an optional implementation, the multiple transmission nodes include a first transmission node and a second transmission node, the first transmission node is associated with a first timing advance TA, the first indication information is used to activate one or several beams associated with the first transmission node, and the one or several beams associated with the first transmission node are all associated with the first TA.

[0631] For ease of explanation, in this optional implementation, it is assumed that the multiple transmission nodes include a first transmission node and a second transmission node. After the transmission node sends the eighth configuration information to the terminal device, the terminal device can configure TA-related information according to the eighth configuration information. After the terminal device receives the first indication information, the terminal device is instructed to use only the specified beam or TCI-state to communicate with the first transmission node. At this time, the terminal device will only use one or more beams associated with the first transmission node to communicate with the first transmission node.

[0632] Based on the embodiments corresponding to Figures 1a to 7, in order to better implement the above solutions of the embodiments of the present application, the following also provides related devices for implementing the above solutions. Please refer to Figure 8, which is a structural diagram of a communication device provided in the embodiments of the present application.

[0633] The communication device 8000 may be one of the terminal devices 120a-120j shown in FIG1a, or may be a component of a terminal device (such as a processor, a chip, or a chip system). The communication device 8000 includes:

[0634] The transceiver module 8001 is configured to receive first indication information, where the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode, where the first communication mode instructs the terminal device to communicate with multiple transmission nodes using multiple beams respectively, and the second communication mode instructs the terminal device to communicate with a single transmission node using a single beam;

[0635] The processing module 8002 is configured to determine a first beam according to the first indication information;

[0636] The processing module 8002 is further configured to measure or transmit a reference signal or transmit a channel according to the first beam.

[0637] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, multiple beams are respectively associated with multiple CSI-RS sets, and each CSI-RS set includes multiple CSI-RSs.

[0638] Before the terminal device receives the first indication information, the terminal device receives first configuration information, where the first configuration information instructs the terminal device to report second measurement results of K groups of CSI-RSs, where K is greater than or equal to 0, and the second measurement results of each group of CSI-RSs include at least two CSI-RSs, where the at least two CSI-RSs are from different CSI-RS sets;

[0639] After the terminal device receives the first indication information and determines the first beam according to the first indication information, the processing module 8002 is further configured to: the terminal device determines a first CSI-RS set associated with the first beam from multiple CSI-RS sets; and the terminal device measures only the first CSI-RS set to obtain a first measurement result;

[0640] After the terminal device switches from the first communication mode to the second communication mode, the terminal device only reports the first measurement result, and the first measurement result includes the second measurement results of M CSI-RSs, and the second measurement results of the M CSI-RSs all come from the first CSI-RS set, and M is greater than or equal to 0.

[0641] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, the CSI-RS set includes multiple CSI-RS groups and one or more CSI-RS resource pairs, each CSI-RS group includes multiple CSI-RSs, the CSI-RSs in the multiple CSI-RS groups are respectively associated with multiple beams, and the CSI-RS resource pair includes one CSI-RS from each CSI-RS group.

[0642] Before the terminal device receives the first indication information, the terminal device receives second configuration information, where the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of a CSI-RS resource pair;

[0643] After the terminal device receives the first indication information and determines the first beam based on the first indication information, the processing module 8002 is further used to: the terminal device determines the CSI-RS associated with the first beam from the CSI-RS set; the terminal device only measures the CSI-RS associated with the first beam to obtain a third measurement result.

[0644] After the terminal device switches from the first communication mode to the second communication mode, the terminal device only reports the third measurement result.

[0645] In one possible implementation, the reference signal includes a sounding reference signal (SRS), and the multiple beams are respectively associated with multiple SRS sets. The processing module 8002 is further configured to:

[0646] The terminal device determines an SRS set associated with the first beam from a plurality of SRS sets;

[0647] The terminal device only transmits the set of SRS associated with the first beam.

[0648] In one possible implementation, the channel includes a physical downlink shared channel PDSCH scheduled in the first downlink control information DCI format, and the processing module 8002 is further configured to:

[0649] The terminal device receives a first DCI, where the first DCI is used to schedule a PDSCH;

[0650] The terminal device uses the first beam to receive the PDSCH scheduled by the first DCI format.

[0651] One possible implementation further includes:

[0652] The first DCI includes a first field, where the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive the PDSCH;

[0653] The terminal device uses the first beam to receive the PDSCH scheduled by the first DCI format.

[0654] In one possible implementation, the channel includes a physical uplink shared channel (PUSCH) scheduled in a second downlink control information (DCI) format, and the terminal device transmits the channel according to the first beam, including:

[0655] The terminal device receives a second DCI, where the second DCI is used to schedule a PUSCH;

[0656] The terminal device uses the first beam to send the PUSCH scheduled by the second DCI format.

[0657] One possible implementation further includes:

[0658] The second DCI includes a second field, where the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send the PUSCH;

[0659] The terminal device uses the first beam to send the PUSCH scheduled by the second DCI format.

[0660] In a possible implementation, the first indication information includes a media access control element MAC CE.

[0661] In one possible implementation, the first indication information further includes third downlink control information (DCI), where the third DCI instructs the terminal device to communicate with a single transmission node using the first beam. The terminal device determines the first beam based on the first indication information, including:

[0662] The terminal device switches from the first communication mode to the second communication mode according to the MAC CE;

[0663] The terminal device determines the first beam based on the third DCI.

[0664] In one possible implementation, the multiple transmission nodes include a first transmission node and a second transmission node, the first transmission node is associated with a first timing advance TA, the first indication information is used to activate one or several beams associated with the first transmission node, and the one or several beams associated with the first transmission node are all associated with the first TA.

[0665] In one possible implementation, the second transmission node is associated with the second TA, further comprising:

[0666] The terminal device stops the timer of the second TA;

[0667] The terminal device stops the random access channel RACH process with the second TA;

[0668] The terminal device clears the transmission of the uplink physical channel or uplink reference signal with the second TA;

[0669] The terminal device clears the hybrid automatic repeat request HARQ cache corresponding to the second TA.

[0670] In one possible implementation, a condition for the terminal device to switch from the first communication mode to the second communication mode is:

[0671] After the first time period, the terminal device receives the first indication information and feeds back confirmation information to the transmission node.

[0672] In a possible implementation, the first communication mode is a multiple receiving transmission point mode MTRP, and the second communication mode is a single receiving transmission point mode STRP.

[0673] In this embodiment, the operations performed by each unit in the communication device 8000 are similar to those described in the method embodiments shown in Figures 2 to 7 above, and can be used to implement the functions of the computing device in the above method embodiments, and can also achieve the beneficial effects of the above method embodiments, which will not be repeated here.

[0674] Please refer to FIG. 9 , which is another structural diagram of a communication device provided in an embodiment of the present application.

[0675] The communication device 9000 may be the network device 110a or 110b shown in FIG. 1a , or may be a component of a network device (e.g., a processor, a chip, or a chip system). The communication device 9000 includes:

[0676] Transceiver module 9001 is configured to send first indication information to a terminal device, where the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode. The first communication mode instructs the terminal device to communicate with multiple transmission nodes using multiple beams, respectively. The second communication mode instructs the terminal device to communicate with a single transmission node using a single beam.

[0677] The processing module 9002 is configured to receive a measurement result of a reference signal from a terminal device, or to transmit a reference signal or a channel.

[0678] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, multiple beams are respectively associated with multiple CSI-RS sets, each CSI-RS set includes multiple CSI-RSs, and before sending the first indication information to the terminal device, the following is further included:

[0679] Sending first configuration information to the terminal device, where the first configuration information instructs the terminal device to report second measurement results of K groups of CSI-RSs, where K is greater than or equal to 0, and the second measurement result of each group of CSI-RSs includes at least two CSI-RSs, where the at least two CSI-RSs are from different CSI-RS sets;

[0680] After sending the first indication information to the terminal device, the processing module 9002 is further configured to:

[0681] A first measurement result is received from a terminal device, where the first measurement result includes second measurement results of M CSI-RSs, where the second measurement results of the M CSI-RSs are all from a first CSI-RS set, and M is greater than or equal to 0.

[0682] In one possible implementation, the reference signal includes a channel state information reference signal CSI-RS, the CSI-RS set includes multiple CSI-RS groups and one or more CSI-RS resource pairs, each CSI-RS group includes multiple CSI-RSs, the CSI-RSs in the multiple CSI-RS groups are respectively associated with multiple beams, and the CSI-RS resource pair includes one CSI-RS from each CSI-RS group. Before sending the first indication information to the terminal device, the following is further included:

[0683] Sending second configuration information to the terminal device, where the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of one CSI-RS resource pair;

[0684] After sending the first indication information to the terminal device, the processing module 9002 is further configured to:

[0685] A third measurement result is received from the terminal device, where the third measurement result is a result of the terminal device measuring only the CSI-RS associated with the first beam.

[0686] In one possible implementation, the reference signal includes a sounding reference signal (SRS), and the multiple beams are respectively associated with multiple SRS sets. The processing module 9002 is further configured to:

[0687] A set of SRSs associated with a first beam is received.

[0688] In one possible implementation, the channel includes a physical downlink shared channel PDSCH scheduled in the first downlink control information DCI format, and the processing module 9002 is further configured to:

[0689] Sending a first DCI to the terminal device, where the first DCI is used to schedule the PDSCH;

[0690] Send a PDSCH scheduled in the first DCI format to the terminal device.

[0691] One possible implementation further includes:

[0692] The first DCI includes a first field, where the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive the PDSCH;

[0693] Send a PDSCH scheduled in the first DCI format to the terminal device.

[0694] In one possible implementation, the channel includes a physical uplink shared channel PUSCH scheduled in a second downlink control information DCI format, and transmitting the channel includes:

[0695] Sending a second DCI to the terminal device, where the second DCI is used to schedule the PUSCH;

[0696] A PUSCH scheduled by the second DCI format is received.

[0697] One possible implementation further includes:

[0698] The second DCI includes a second field, where the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send the PUSCH;

[0699] A PUSCH scheduled by the second DCI format is received.

[0700] In a possible implementation, the first indication information includes a media access control element MAC CE.

[0701] In one possible implementation, the first indication information also includes third downlink control information DCI, and the third DCI indicates that the terminal device uses the first beam to communicate with a single transmission node.

[0702] In one possible implementation, multiple network devices include a first network device, the first network device is associated with a first timing advance TA, the first indication information is used to activate one or several beams associated with the first network device, and the one or several beams associated with the first network device are all associated with the first TA.

[0703] In a possible implementation, the first indication information takes effect when: after a first time period of receiving confirmation information.

[0704] In a possible implementation, the first communication mode is a multiple receiving transmission point mode MTRP, and the second communication mode is a single receiving transmission point mode STRP.

[0705] In this embodiment, the operations performed by each unit in the communication device 9000 are similar to those described in the method embodiments shown in Figures 2 to 7 above, and can be used to implement the functions of the computing device in the above method embodiments, and can also achieve the beneficial effects of the above method embodiments, which will not be repeated here.

[0706] Please refer to Figure 10, which is another schematic diagram of the structure of a communication device provided in an embodiment of the present application. Communication device 10000 can be a network device, a terminal device, or a chip, chip system, processor, etc. that supports the terminal device or network device to implement the above-mentioned method. This device can be used to implement the method described in Figures 2 to 7 of the embodiments of the present application. For details, please refer to the description of the above-mentioned method embodiment.

[0707] The communication device 10000 includes one or more processors 1001 and an interface circuit 1002. The processor 1001 and the interface circuit 1002 are coupled to each other. It is understood that the interface circuit 1002 can be a transceiver or an input / output interface.

[0708] Optionally, the communication device 10000 may include one or more memories 1003 for storing instructions executed by the processor 1001 or storing input data required by the processor 1001 to run instructions or storing data generated after the processor 1001 runs instructions.

[0709] In another optional design, processor 1001 may include a transceiver unit for implementing receiving and transmitting functions. For example, the transceiver unit may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing the receiving and transmitting functions may be separate or integrated. The transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or the transceiver circuit, interface, or interface circuit may be used for transmitting or delivering signals.

[0710] In another possible design, the communication device 10000 may include a circuit that can implement the functions of sending, receiving, or communicating in the aforementioned method embodiments.

[0711] When the communication device 10000 is a chip used in a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiments. The terminal device chip receives information from other modules in the terminal device (such as a radio frequency module or antenna), and the information is sent by the network device to the terminal device; or the terminal device chip sends information to other modules in the terminal device (such as a radio frequency module or antenna), and the information is sent by the terminal device to the network device.

[0712] When the above-mentioned communication device 10000 is a module applied to a network device, the network device module of the network device implements the functions of the network device in the above-mentioned method embodiment. The network device module receives information from other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the terminal device to the network device; or the network device module sends information to other modules in the network device (such as a radio frequency module or an antenna), and the information is sent by the network device to the terminal device. The network device module here can be a baseband chip of the network device, or it can be a DU or other module. The DU here can be a DU under the open radio access network (O-RAN) architecture.

[0713] It is understood that the processor 1001 in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0714] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, mobile hard disks, compact disc read-only memory (CD-ROM) or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal device. The processor and the storage medium can also be present in a network device or a terminal device as discrete components.

[0715] The device described in the above embodiments may be a network device or a terminal device, but the scope of the device described in this application is not limited thereto, and the structure of the device may not be limited to FIG10. The device may be an independent device or may be part of a larger device. For example, the device may be:

[0716] (1) An independent integrated circuit (IC), chip, or chip system or subsystem;

[0717] (2) having a set of one or more ICs, optionally including a storage component for storing data and / or instructions;

[0718] (3) ASIC, such as modem (MSM);

[0719] (4) Modules that can be embedded in other devices;

[0720] (5) Receivers, terminal devices, intelligent terminal devices, cellular phones, wireless devices, handheld devices, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, machine devices, home devices, medical devices, industrial equipment, etc.;

[0721] (6)Others, etc.

[0722] Please refer to Figure 11, which is a schematic diagram of another structure of a communication device provided in an embodiment of the present application. Communication device 1100 can be a network device, a terminal device, or a chip, chip system, processor, etc. that supports a terminal device or network device to implement the above-mentioned method. This device can be used to implement the method described in Figures 2 to 7 of the embodiments of the present application. For details, please refer to the description of the above-mentioned method embodiment.

[0723] As shown in Figure 11, it can be understood that the communication device 1100 includes necessary means such as modules, units, elements, circuits, or interfaces, which are appropriately configured together to implement the present solution. The communication device 1100 can be the RAN node, terminal device, core network device, or other network device in Figure 1a, or a component (such as a chip) in these devices, used to implement the method described in the following method embodiment. The communication device 1100 includes one or more processors 1110. The processor 1110 can be a general-purpose processor or a dedicated processor. For example, it can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device (such as an access network (RAN) node, terminal device, or chip), execute software programs, and process software program data.

[0724] Optionally, in one design, the processor 1110 may include a program 1130 (sometimes also referred to as code or instructions), which may be executed on the processor 1110 to cause the communication device 1100 to perform the methods described in the following embodiments. In another possible design, the communication device 1100 includes a circuit (not shown in FIG. 11 ) configured to implement the functions described in FIG. 2 to FIG. 7 in the embodiments.

[0725] Optionally, the communication device 1100 may include one or more memories 1120 on which a program 1140 (sometimes also referred to as code or instructions) is stored. The program 1140 can be run on the processor 1110, so that the communication device 1100 performs the method described in the method embodiments described in Figures 2 to 7.

[0726] Optionally, the processor 1110 and / or the memory 1120 may include an artificial intelligence (AI) module 1170, 1180, which is used to implement AI-related functions. The AI ​​module can be implemented through software, hardware, or a combination of software and hardware. For example, the AI ​​module may include a RIC module. For example, the AI ​​module may be a near real-time access network intelligent controller (RAN intelligent controller, RIC) or a non-real-time RIC.

[0727] Optionally, data may be stored in the processor 1110 and / or the memory 1120. The processor and memory may be provided separately or integrated together.

[0728] Optionally, the communication device 1100 may further include a transceiver 1150 and / or an antenna 1160. The processor 1110 may also be sometimes referred to as a processing unit, and controls the communication device (e.g., a RAN node or a terminal device). The transceiver 1150 may also be sometimes referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, and is configured to implement the transceiver functions of the communication device through the antenna 1160.

[0729] When the communication device in the embodiment of the present application is a network device, the communication device can be as shown in Figure 12, which is another structural schematic diagram of the communication device provided in the embodiment of the present application. The communication device may include one or more radio frequency units, such as a remote radio unit (RRU) 1210 and one or more baseband units (BBU) (also known as digital units, DU) 1220. The RRU 1210 can be called a transceiver module, which may include a transmitting module and a receiving module, or the transceiver module can be a module that can realize the sending and receiving functions. The transceiver module can correspond to the transceiver module 9001 in Figure 9, that is, the transceiver module can perform the actions performed by the transceiver module 1001. Optionally, the transceiver module can also be called a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 1211 and a radio frequency unit 1212. The RRU 1210 part is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals into baseband signals. The BBU 1220 is mainly used for baseband processing, base station control, etc. The RRU 1210 and the BBU 1220 may be physically arranged together or physically separated, that is, a distributed base station.

[0730] The BBU 1220 is the control center of the base station, also known as a processing module, and is primarily used to perform baseband processing functions such as channel coding, multiplexing, modulation, and spread spectrum. Furthermore, the processing module can control the actions performed by the processing module 9002 in FIG. 9 . For example, the BBU (processing module) can be used to control the base station to execute the network device operation procedures described in the above-described method embodiments.

[0731] In one example, the BBU 1220 can be composed of one or more single boards, and multiple single boards can jointly support a wireless access network with a single access standard (such as an LTE network), or can separately support wireless access networks with different access standards (such as an LTE network, a 5G network, or other networks). The BBU 1220 also includes a memory 1221 and a processor 1222. The memory 1221 is used to store necessary instructions and data. The processor 1222 is used to control the base station to perform necessary actions, such as controlling the base station to execute the operation process of the network device in the above method embodiment. The memory 1221 and the processor 1222 can serve one or more single boards. That is, a memory and a processor can be set separately on each single board. Alternatively, multiple single boards can share the same memory and processor. In addition, necessary circuits can also be set on each single board.

[0732] An embodiment of the present application further provides a computer-readable medium on which a computer program is stored. When the computer program is executed by a computer, the functions of any of the above method embodiments are realized.

[0733] The embodiments of the present application also provide a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.

[0734] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions according to the embodiments of the present application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. Available media may be magnetic media (eg, floppy disks, hard disks, tapes), optical media (eg, high-density digital video discs (DVDs)), or semiconductor media (eg, solid state disks (SSDs)).

[0735] It is understood that the systems, devices, and methods described in this application may also be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed may be through some interface, indirect coupling or communication connection of devices or units, and may be electrical, mechanical, or other forms.

[0736] The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the scope of protection of the present application. The various numerical numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of each process does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic.

Claims

1. A transmission method, characterized in that: include: The terminal device receives first indication information, where the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode, where the first communication mode instructs the terminal device to communicate with multiple transmission nodes using multiple beams respectively, and the second communication mode instructs the terminal device to communicate with a single transmission node using a single beam; The terminal device determines a first beam according to the first indication information; The terminal device measures or transmits a reference signal according to the first beam, or transmits a channel.

2. The method according to claim 1, characterized in that: The reference signal includes a channel state information reference signal CSI-RS, the multiple beams are respectively associated with multiple CSI-RS sets, each CSI-RS set includes multiple CSI-RSs, and the terminal device measures the reference signal according to the first beam, including: The terminal device determines a first CSI-RS set associated with the first beam from the multiple CSI-RS sets; The terminal device only measures the first CSI-RS set to obtain a first measurement result.

3. The method according to claim 2, characterized in that Before the terminal device receives the first indication information, the method further includes: The terminal device receives first configuration information, where the first configuration information indicates that the terminal device reports second measurement results of K groups of CSI-RSs, where K is greater than or equal to 0, and the second measurement results of each group of CSI-RSs include at least two CSI-RSs, and the at least two CSI-RSs are from different CSI-RS sets; After the terminal device switches from the first communication mode to the second communication mode, the terminal device only reports the first measurement result, where the first measurement result includes second measurement results of M CSI-RSs, where the second measurement results of the M CSI-RSs all come from the first CSI-RS set, and M is greater than or equal to 0.

4. The method according to claim 1, characterized in that: The reference signal includes a channel state information reference signal CSI-RS, the CSI-RS set includes multiple CSI-RS groups and one or more CSI-RS resource pairs, each CSI-RS group includes multiple CSI-RSs, the CSI-RSs in the multiple CSI-RS groups are respectively associated with the multiple beams, the CSI-RS resource pair includes one CSI-RS from each CSI-RS group, and the terminal device measures the reference signal according to the first beam, including: The terminal device determines a CSI-RS associated with the first beam from the CSI-RS set; The terminal device only measures the CSI-RS associated with the first beam to obtain a third measurement result.

5. The method according to claim 4, characterized in that Before the terminal device receives the first indication information, the method further includes: The terminal device receives second configuration information, where the second configuration information indicates that the terminal device reports a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information indicates that the terminal device reports a fifth measurement result of a CSI-RS resource pair; After the terminal device switches from the first communication mode to the second communication mode, the terminal device only reports the third measurement result.

6. The method according to any one of claims 1 to 5, characterized in that The reference signal includes a sounding reference signal SRS, the multiple beams are respectively associated with multiple SRS sets, and the terminal device transmits the reference signal according to the first beam, including: The terminal device determines an SRS set associated with the first beam from the multiple SRS sets; The terminal device only sends a set of SRS associated with the first beam.

7. The method according to any one of claims 1 to 6, characterized in that The channel includes a physical downlink shared channel PDSCH scheduled in a first downlink control information DCI format, and the terminal device transmits the channel according to the first beam, including: The terminal device receives the first DCI, where the first DCI is used to schedule the PDSCH; The terminal device uses the first beam to receive the PDSCH scheduled by the first DCI format.

8. The method according to claim 7, characterized in that Also includes: The first DCI includes a first field, where the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive the PDSCH; The terminal device uses the first beam to receive the PDSCH scheduled by the first DCI format.

9. The method according to any one of claims 1 to 8, characterized in that The channel includes a physical uplink shared channel PUSCH scheduled in a second downlink control information DCI format, and the terminal device transmits the channel according to the first beam, including: The terminal device receives the second DCI, where the second DCI is used to schedule the PUSCH; The terminal device uses the first beam to send the PUSCH scheduled by the second DCI format.

10. The method according to claim 9, characterized in that Also includes: The second DCI includes a second field, where the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send the PUSCH; The terminal device uses the first beam to send the PUSCH scheduled by the second DCI format.

11. The method according to any one of claims 1 to 10, characterized in that The first indication information includes a media access control element MAC CE.

12. The method according to claim 11, characterized in that The first indication information further includes third downlink control information DCI, where the third DCI indicates that the terminal device uses the first beam to communicate with the single transmission node, and the terminal device determines the first beam according to the first indication information, including: The terminal device switches from the first communication mode to the second communication mode according to the MAC CE; The terminal device determines the first beam according to the third DCI.

13. The method according to any one of claims 1 to 12, characterized in that The multiple transmission nodes include a first transmission node and a second transmission node, the transmission node is associated with a first timing advance TA, the first indication information is used to activate one or several beams associated with the transmission node, and the one or several beams associated with the transmission node are all associated with the first TA.

14. The method according to claim 13, characterized in that The second transmission node is associated with a second TA, and the method further includes: The terminal device stops the timer of the second TA; The terminal device stops the random access channel RACH process with the second TA; The terminal device clears the transmission of the uplink physical channel or uplink reference signal with the second TA; The terminal device clears the hybrid automatic repeat request HARQ cache corresponding to the second TA.

15. The method according to any one of claims 1 to 14, characterized in that The effective condition for the terminal device to switch from the first communication mode to the second communication mode is: After a first time period, the terminal device receives the first indication information and feeds back confirmation information to the network device.

16. The method according to any one of claims 1 to 15, characterized in that The first communication mode is a multiple receiving transmission point mode MTRP, and the second communication mode is a single receiving transmission point mode STRP.

17. A transmission method, characterized in that: include: Sending first indication information to a terminal device, where the first indication information is used to instruct the terminal device to switch from a first communication mode to a second communication mode, where the first communication mode instructs the terminal device to communicate with multiple transmission nodes using multiple beams respectively, and the second communication mode instructs the terminal device to communicate with a single transmission node using a single beam; A measurement result of a reference signal is received from the terminal device, or a reference signal or a channel is transmitted.

18. The method according to claim 17, characterized in that The reference signal includes a channel state information reference signal CSI-RS, the multiple beams are respectively associated with multiple CSI-RS sets, each CSI-RS set includes multiple CSI-RSs, and before sending the first indication information to the terminal device, further comprising: Sending first configuration information to the terminal device, where the first configuration information instructs the terminal device to report second measurement results of K groups of CSI-RSs, where K is greater than or equal to 0, and the second measurement result of each group of CSI-RSs includes at least two CSI-RSs, and the at least two CSI-RSs are from different CSI-RS sets; After sending the first indication information to the terminal device, receiving a measurement result of a reference signal from the terminal device includes: A first measurement result is received from the terminal device, where the first measurement result includes second measurement results of M CSI-RSs, where the second measurement results of the M CSI-RSs are all from the first CSI-RS set, and M is greater than or equal to 0.

19. The method according to claim 17, characterized in that The reference signal includes a channel state information reference signal CSI-RS, the CSI-RS set includes multiple CSI-RS groups and one or more CSI-RS resource pairs, each CSI-RS group includes multiple CSI-RSs, the CSI-RSs in the multiple CSI-RS groups are respectively associated with the multiple beams, and the CSI-RS resource pair includes one CSI-RS from each CSI-RS group, before sending the first indication information to the terminal device, further comprising: Sending second configuration information to the terminal device, where the second configuration information instructs the terminal device to report a fourth measurement result of X CSI-RSs, where X is greater than or equal to 0, and / or the second configuration information instructs the terminal device to report a fifth measurement result of a CSI-RS resource pair; After sending the first indication information to the terminal device, receiving a measurement result of a reference signal from the terminal device includes: A third measurement result is received from the terminal device, where the third measurement result is a result of the terminal device measuring only the CSI-RS associated with the first beam.

20. The method according to any one of claims 17 to 19, characterized in that The reference signal includes a sounding reference signal SRS, the multiple beams are respectively associated with multiple SRS sets, and the reference signal is transmitted, including: A set of SRS associated with the first beam is received.

21. The method according to any one of claims 17 to 20, characterized in that The channel includes a physical downlink shared channel PDSCH scheduled in a first downlink control information DCI format, and transmitting the channel includes: Sending the first DCI to the terminal device, where the first DCI is used to schedule the PDSCH; Send the PDSCH scheduled by the first DCI format to the terminal device.

22. The method according to claim 21, characterized in that Also includes: The first DCI includes a first field, where the first field indicates that the terminal device is in the second communication mode, or the first field indicates that the terminal device uses the first beam to receive the PDSCH; Send the PDSCH scheduled by the first DCI format to the terminal device.

23. The method according to any one of claims 17 to 22, characterized in that The channel includes a physical uplink shared channel PUSCH scheduled in a second downlink control information DCI format, and transmitting the channel includes: Sending the second DCI to the terminal device, where the second DCI is used to schedule the PUSCH; Receive a PUSCH scheduled by the second DCI format.

24. The method according to claim 23, characterized in that Also includes: The second DCI includes a second field, where the second field indicates that the terminal device is in the second communication mode, or the second field indicates that the terminal device uses the first beam to send the PUSCH; Receive a PUSCH scheduled by the second DCI format.

25. The method according to any one of claims 17 to 24, characterized in that The first indication information includes a media access control element MAC CE.

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