Random access method and related apparatus

Abstract

The present application provides a random access method and a related apparatus, used for a terminal device to select a proper path loss to send a random access request, thereby enabling the acquisition of a timing advance (TA) value in a multiple transmission and reception point (TRP) transmission mode. The method provided by the present application comprises: a terminal device receives a physical downlink control channel (PDCCH) from a network device, the PDCCH being used for triggering a random access process between the terminal device and the network device; on the basis of first information in the PDCCH, the terminal device determines a path loss corresponding to a first path loss resource or a path loss corresponding to a second path loss resource, the first path loss resource being a quasi-co-location (QCL) resource in a TCI state used by the PDCCH, and the second path loss resource being a synchronization signal block (SSB) resource indicated in the PDCCH; and the terminal device sends the random access request to the network device on the basis of the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource.

Description

Random access method and related device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on October 31, 2023, with application number 202311437985.X and invention name “Random Access 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 random access method and related devices. Background Art

[0003] The timing advance (TA) value is used by a terminal device for uplink transmission. Specifically, it refers to the time that the uplink frame that the terminal device sends uplink data is earlier than the downlink frame that the terminal device receives downlink data. The TA value can be obtained through the random access channel (RACH) process.

[0004] Specifically, the network device sends a physical downlink control channel (PDCCH) to the terminal device. The PDCCH is used to instruct the terminal device to initiate a random access procedure. The terminal device sends a random access request to the network device. The network device then calculates the TA value based on the reception time of the random access request. The network device sends a random access response to the terminal device. The random access response includes the TA value, so that the terminal device can obtain the TA value.

[0005] However, the above technical solution is applicable to the single transmission and reception point (TRP) transmission mode, but not to the multi-TRP transmission mode. For example, in the multi-TRP transmission mode, the network device sends a PDCCH to the terminal device, thereby triggering the terminal device to initiate a random access request. However, in the multi-TRP transmission mode, there are multiple TRPs, and the terminal device cannot know to which TRP the random access request should be sent. Therefore, the terminal device cannot send the random access request according to the correct path loss. As a result, in the multi-TRP transmission mode, the terminal device cannot obtain the TA value.

[0006] Summary of the Invention

[0007] The present application provides a random access method and related apparatus for enabling a terminal device to select an appropriate path loss to send a random access request, thereby enabling the acquisition of a TA value in a multi-TRP transmission mode.

[0008] The first aspect of the present application provides a random access method, which is performed by a terminal device. The terminal device may be a device or apparatus with a chip, or a device or apparatus with an integrated circuit, or a chip, chip system, module, or control unit in the aforementioned device or apparatus, and the present application does not limit this. It should be noted that in the present application, when referring to a terminal device, it may refer to the terminal device itself, or to a chip, functional module or integrated circuit in the terminal device that completes the method provided by the present application, and the present application does not limit this. In the first aspect and its possible implementation methods, the method is described as being performed by a terminal device. The method provided in the present application includes:

[0009] A terminal device receives a PDCCH from a network device. The PDCCH is used to trigger a random access process between the terminal device and the network device. The terminal device determines the path loss corresponding to a first path loss resource or a second path loss resource based on first information in the PDCCH. The first path loss resource is a quasi-co-location (QCL) resource in the transmission configuration indicator (TCI) state used by the PDCCH, and the second path loss resource is a synchronization signal (synchronization signal)-physical broadcast channel (PBCH) block (SS / PBCH block) resource indicated in the PDCCH, referred to as a synchronization signal block (SSB) resource. The terminal device sends a random access request to the network device based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource. This enables the terminal device to select an appropriate path loss to send a random access request, thereby enabling the acquisition of a TA value in a multi-TRP transmission mode. Optionally, the first information is used to determine the first path loss resource or the second path loss resource, or the first information is used to determine the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource.

[0010] The second aspect of the present application provides a random access method, which is performed by a network device. The network device may be a device or apparatus with a chip, or a device or apparatus with an integrated circuit, or a chip, chip system, module or control unit in the aforementioned device or apparatus, and the present application does not limit this. It should be noted that in the present application, when referring to a network device, it may refer to the network device itself, or to a chip, functional module or integrated circuit in the network device that completes the method provided by the present application, and the present application does not limit this. In the second aspect and its possible implementation methods, the method is described as being performed by a network device. The method provided in the present application includes:

[0011] The network device sends a PDCCH to the terminal device. The PDCCH is used to trigger a random access procedure between the terminal device and the network device. The network device receives a random access request from the terminal device. The random access request is sent based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource, determined based on the first information in the PDCCH. The first path loss resource is the QCL resource in the TCI state used by the PDCCH, and the second path loss resource is the SSB resource indicated in the PDCCH. This allows the terminal device to select the appropriate path loss to send the random access request, thereby enabling the acquisition of the TA value in the multi-TRP transmission mode.

[0012] Based on the first aspect or the second aspect, in a possible implementation, the first information is the first field in the PDCCH, so that the terminal device selects an appropriate path loss according to the first field to send a random access request, thereby enabling the acquisition of the TA value in the multi-TRP transmission mode.

[0013] Based on the first aspect or the second aspect, in one possible implementation, the first field is used to indicate a timing advance group (TAG); if the TAG indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, a random access request is sent based on the path loss corresponding to the first path loss resource; or, if the TAG indicated by the first field is different from the TAG associated with the TCI state used by the PDCCH, a random access request is sent based on the path loss corresponding to the second path loss resource. In this implementation, a terminal device can implicitly determine the TRP for which the PDCCH-triggered random access procedure is targeted (i.e., by comparing the TAG), thereby facilitating the terminal device to determine an appropriate path loss and send a random access request based on that path loss. This implements a TRP-level random access procedure. For example, if the TAG indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, it can be determined that the TRP for which the PDCCH-triggered random access procedure is targeted is the same as the TRP used to transmit the PDCCH, i.e., a multi-TRP transmission mode in the same cell is used. In this case, the terminal device sends a random access request based on the path loss corresponding to the first path loss resource. If the TAG indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, it can be known that the TRP targeted by the random access process triggered by the PDCCH is different from the TRP for sending the PDCCH, that is, a multi-TRP transmission mode across cells, then the terminal device sends a random access request based on the path loss corresponding to the second path loss resource. Optionally, the TAG indicated by the first field is the TAG corresponding to the random access process triggered by the PDCCH, or the TAG corresponding to the TRP corresponding to the random access process triggered by the PDCCH. Optionally, the implementation method can also be described as: the first field is used to indicate whether the TAG corresponding to the random access process triggered by the PDCCH is the same as the TAG associated with the TCI state adopted by the PDCCH; if they are the same, a random access request is sent based on the path loss corresponding to the first path loss resource; if they are different, a random access request is sent based on the path loss corresponding to the second path loss resource.

[0014] Based on the first aspect, in one possible implementation, the method further includes: the terminal device receiving a random access response from the network device, the random access response including a second field, the second field being used to indicate a TAG corresponding to a TA value carried in the random access response, the TAG indicated by the second field being the same as the TAG indicated by the first field. This avoids a situation where different TAGs correspond to the random access process, thereby achieving alignment of the TAGs corresponding to the random access process.

[0015] Based on the second aspect, in one possible implementation, the method further includes: the network device sending a random access response to the terminal device, the random access response including a second field, the second field being used to indicate a TAG corresponding to a TA value carried in the random access response, the TAG indicated by the second field being the same as the TAG indicated by the first field. This avoids situations where different TAGs correspond to the random access process, and achieves alignment of the TAGs corresponding to the random access process.

[0016] Based on the first aspect or the second aspect, in one possible implementation, the first field is used to indicate a control channel group identifier; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, a random access request is sent based on the path loss corresponding to the first path loss resource; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, a random access request is sent based on the path loss corresponding to the second path loss resource. In this implementation, a terminal device can implicitly determine the TRP for the random access procedure triggered by the PDCCH (i.e., by comparing the control channel group identifier), thereby facilitating the terminal device to determine the appropriate path loss and send a random access request based on the path loss. This implements a TRP-level random access procedure. For example, if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, it can be determined that the TRP for the random access procedure triggered by the PDCCH is the same as the TRP for sending the PDCCH, i.e., a multi-TRP transmission mode in the same cell. In this case, the terminal device sends a random access request based on the path loss corresponding to the first path loss resource. If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, it can be known that the TRP targeted by the random access process triggered by the PDCCH is different from the TRP for sending the PDCCH, that is, a multi-TRP transmission mode across cells, then the terminal device sends a random access request according to the path loss corresponding to the second path loss resource. Optionally, the control channel group identifier indicated by the first field is the control channel group identifier corresponding to the random access process triggered by the PDCCH, or the control channel group identifier corresponding to the TRP corresponding to the random access process triggered by the PDCCH. Optionally, the implementation method can also be described as: the first field is used to indicate whether the control channel group identifier corresponding to the random access process triggered by the PDCCH is the same as the control channel group identifier corresponding to the PDCCH; if they are the same, a random access request is sent according to the path loss corresponding to the first path loss resource; if they are different, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0017] Based on the first aspect, in one possible implementation, the method further includes: the terminal device receiving a random access response from the network device, the random access response including a second field, the second field being used to indicate a tag corresponding to a TA value carried in the random access response message; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the tag indicated by the second field is the same as the tag associated with the TCI state used by the PDCCH; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the tag indicated by the second field is different from the tag associated with the TCI state used by the PDCCH. In this implementation, if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, it can be known that the random access procedure triggered by the PDCCH targets the same TRP as the TRP for sending the PDCCH, i.e., a multi-TRP transmission mode in the same cell. The tag indicated by the second field should be the same as the tag associated with the TCI state used by the PDCCH, thereby avoiding the situation where the tags corresponding to the random access procedure are different and achieving tag alignment for the random access procedure. If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, it can be known that the TRP targeted by the random access process triggered by the PDCCH is different from the TRP for sending the PDCCH, that is, in a multi-TRP transmission mode across cells, the TAG indicated by the second field should be different from the TAG associated with the TCI state used by the PDCCH. This allows different TRPs to correspond to different TAGs.

[0018] Based on the second aspect, in a possible implementation, the method further includes: the network device sends a random access response to the terminal device, the random access response includes a second field, the second field is used to indicate the TAG corresponding to the TA value carried in the random access response message; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state used by the PDCCH. In this implementation, if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, it can be known that the TRP targeted by the random access procedure triggered by the PDCCH is the same as the TRP for sending the PDCCH, that is, a multi-TRP transmission mode in the same cell. The TAG indicated by the second field should be the same as the TAG associated with the TCI state used by the PDCCH, so as to avoid the situation where the TAGs corresponding to the random access procedure are different and achieve TAG alignment corresponding to the random access procedure. If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, it can be known that the TRP targeted by the random access process triggered by the PDCCH is different from the TRP for sending the PDCCH, that is, in a multi-TRP transmission mode across cells, the TAG indicated by the second field should be different from the TAG associated with the TCI state used by the PDCCH. This allows different TRPs to correspond to different TAGs.

[0019] Based on the first aspect or the second aspect, in one possible implementation, the first field is used to indicate whether the random access procedure is a first type of random access procedure or a second type of random access procedure. If the random access procedure is a first type of random access procedure, a random access request is sent based on the path loss corresponding to the first path loss resource; or, if the random access procedure is a second type of random access procedure, a random access request is sent based on the path loss corresponding to the second path loss resource. In this implementation, a terminal device can determine the TRP targeted by the PDCCH-triggered random access procedure by displaying the information (indicating the type of random access procedure), thereby facilitating the terminal device to determine the appropriate path loss and send the random access request based on that path loss. This implements a TRP-level random access procedure. For example, if the random access procedure is a first type of random access procedure, it can be understood as a multi-TRP transmission mode within the same cell. In this case, the terminal device sends the random access request based on the path loss corresponding to the first path loss resource. If the random access procedure is a second type of random access procedure, it can be understood as a multi-TRP transmission mode across cells. In this case, the terminal device sends the random access request based on the path loss corresponding to the second path loss resource. This enables the terminal device to select the appropriate path loss to send the random access request.

[0020] Based on the first aspect or the second aspect, in one possible implementation, a first type of random access procedure includes: a random access procedure in which a TRP corresponding to the first type of random access procedure is the same as a TRP for transmitting a PDCCH; in other words, if the TRP corresponding to the first type of random access procedure is the same as a TRP for transmitting a PDCCH, or if the TRP corresponding to the random access procedure is the same as a TRP for transmitting a PDCCH, then the random access procedure is a first type of random access procedure. Thus, the first type of random access procedure is defined from the perspective of TRP.

[0021] or,

[0022] A first type of random access procedure is a random access procedure in which the TAG corresponding to the procedure is the same as the TAG associated with the TCI state used by the PDCCH. In other words, if the TAG corresponding to the procedure is the same as the TAG associated with the TCI state used by the PDCCH, then the random access procedure is a first type of random access procedure. Thus, the first type of random access procedure is defined from the perspective of the TAG.

[0023] or,

[0024] A first type of random access procedure is a random access procedure in which the control channel group identifier corresponding to the PDCCH is the same as the control channel group identifier corresponding to the first type of random access procedure. In other words, if the control channel group identifier corresponding to the first type of random access procedure is the same as the control channel group identifier corresponding to the PDCCH; or if the control channel group identifier corresponding to the random access procedure is the same as the control channel group identifier corresponding to the PDCCH, then the random access procedure is a first type of random access procedure. Thus, the first type of random access procedure is defined from the perspective of the control channel group identifier.

[0025] Based on the first aspect or the second aspect, in one possible implementation, the second type of random access procedure includes: a random access procedure in which a TRP corresponding to the second type of random access procedure is different from a TRP for sending a PDCCH; in other words, if the TRP corresponding to the second type of random access procedure is the same as the TRP for sending the PDCCH, or if the TRP corresponding to the random access procedure is different from the TRP for sending the PDCCH, then the random access procedure is a second type of random access procedure. Thus, the second type of random access procedure is defined from the perspective of TRP.

[0026] or,

[0027] The second type of random access procedure is a random access procedure in which the TAG corresponding to the random access procedure is different from the TAG associated with the TCI state used by the PDCCH. In other words, if the TAG corresponding to the second type of random access procedure is the same as the TAG associated with the TCI state used by the PDCCH, or if the TAG corresponding to the random access procedure is different from the TAG associated with the TCI state used by the PDCCH, then the random access procedure is a second type of random access procedure. Thus, the second type of random access procedure is defined from the perspective of the TAG.

[0028] or,

[0029] A second type of random access procedure is a random access procedure in which the control channel group identifier corresponding to the PDCCH is different. In other words, if the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH, or if the control channel group identifier corresponding to the random access procedure is different from the control channel group identifier corresponding to the PDCCH, then the random access procedure is a second type of random access procedure. Thus, the second type of random access procedure is defined from the perspective of the control channel group identifier.

[0030] Based on the first aspect, in a possible implementation, the method further includes: the terminal device receives a random access response from the network device, the random access response includes a second field, and the second field is used to indicate a TAG corresponding to the TA value carried in the random access response; if the random access procedure is a first type of random access procedure, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH, thereby avoiding the situation where the TAG corresponding to the random access procedure is different and achieving TAG alignment corresponding to the random access procedure; or if the random access procedure is a second type of random access procedure, the TAG indicated by the second field is different from the TAG associated with the TCI state used by the PDCCH. Therefore, different TRPs correspond to different TAGs.

[0031] Based on the second aspect, in a possible implementation, the method further includes: the network device receives a random access response from the terminal device, the random access response includes a second field, and the second field is used to indicate a TAG corresponding to the TA value carried in the random access response; if the random access procedure is a first type of random access procedure, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH, thereby avoiding the situation where the TAG corresponding to the random access procedure is different and achieving TAG alignment corresponding to the random access procedure; or if the random access procedure is a second type of random access procedure, the TAG indicated by the second field is different from the TAG associated with the TCI state used by the PDCCH. Therefore, different TRPs correspond to different TAGs.

[0032] Based on the first aspect or the second aspect, in one possible implementation, the first field is used to indicate whether to send a random access request based on a path loss corresponding to a first path loss resource or to indicate whether to send a random access request based on a path loss corresponding to a second path loss resource. Thus, the terminal device is instructed to send a random access request based on the path loss corresponding to the first path loss resource or to send a random access request based on the path loss corresponding to the second path loss resource. This facilitates the terminal device to send a random access request based on an appropriate path loss.

[0033] Based on the first aspect, in a possible implementation, the method further includes: the terminal device receives a random access response from the network device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the first field indicates that a random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; thereby avoiding the situation where the TAG corresponding to the random access process is different, and achieving alignment of the TAG corresponding to the random access process. Alternatively, if the first field indicates that a random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH. Thus, different TRPs correspond to different TAGs.

[0034] Based on the second aspect, in a possible implementation, the method further includes: the network device sends a random access response to the terminal device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the first field indicates that a random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; thereby avoiding the situation where the TAG corresponding to the random access process is different, and achieving alignment of the TAG corresponding to the random access process. Alternatively, if the first field indicates that a random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH. Thus, different TRPs correspond to different TAGs.

[0035] Based on the first aspect or the second aspect, in a possible implementation, the first field is used to indicate the SSB resource; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource. In this implementation, the terminal device can determine the TRP targeted by the random access process triggered by the PDCCH in an implicit manner (i.e., by comparing the TAG), thereby facilitating the terminal device to determine the appropriate path loss and send a random access request based on the path loss. This implements a TRP-level random access process. For example, if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, it can be known that the TRP targeted by the random access process triggered by the PDCCH is the same as the TRP for sending the PDCCH, that is, the multi-TRP transmission mode of the same cell, then the terminal device sends a random access request according to the path loss corresponding to the first path loss resource. If the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state used by the PDCCH, it can be known that the TRP targeted by the random access process triggered by the PDCCH is different from the TRP for sending the PDCCH, that is, the multi-TRP transmission mode across cells, then the terminal device sends a random access request according to the path loss corresponding to the second path loss resource. Optionally, the TAG associated with the SSB resource indicated by the first field is the TAG corresponding to the random access process triggered by the PDCCH, or the TAG corresponding to the TRP corresponding to the random access process triggered by the PDCCH.

[0036] Based on the first aspect, in a possible implementation, the method further includes: the terminal device receives a random access response from the network device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; thereby avoiding the situation where the TAG corresponding to the random access process is different, and achieving TAG alignment corresponding to the random access process. Alternatively, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH. Thus, different TRPs correspond to different TAGs.

[0037] Based on the second aspect, in a possible implementation, the method further includes: the network device sends a random access response to the terminal device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; thereby avoiding the situation where the TAG corresponding to the random access process is different, and achieving TAG alignment corresponding to the random access process. Alternatively, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH. Thus, different TRPs correspond to different TAGs.

[0038] Based on the first aspect or the second aspect, in one possible implementation, when a first condition is met, the PDCCH includes the first information; wherein the first condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or, no associated supplementary cell is configured in the service cell corresponding to the PDCCH. That is, when the first condition is met, the network device sends a PDCCH to the terminal device, and the PDCCH includes the first information. That is, in a multi-TRP transmission mode in the same cell, the network device sends a PDCCH containing the first information to the terminal device.

[0039] Based on the first aspect or the second aspect, in a possible implementation, when the second condition is met, the first field is used to indicate the TAG, or the first field is used to indicate whether the TAG corresponding to the random access process is the same as the TAG corresponding to the TCI state adopted by the PDCCH, or the first field is used to indicate the control channel group identifier, or the first field is used to indicate whether the control channel group identifier corresponding to the random access process is the same as the control channel group identifier corresponding to the PDCCH, or the first field is used to indicate whether the random access process is a first type random access process or a second type random access process, or the first field is used to indicate whether a random access request is sent according to the path loss corresponding to the first path loss resource or whether a random access request is sent according to the path loss corresponding to the second path loss resource; wherein the second condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or no associated supplementary cell is configured in the service cell corresponding to the PDCCH. In this implementation, when the second condition is met, it can be known that it is a multi-TRP transmission mode of the same cell, and the first field can indicate any of the above implementations. The terminal device can determine through the first field whether to send a random access request based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource.

[0040] Based on the first aspect or the second aspect, in a possible implementation, when the third condition is met, the first field is used to indicate that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell; wherein the third condition includes at least one of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or an associated supplementary cell is configured in the service cell corresponding to the PDCCH. In this implementation, when the third condition is met, it can be known that it is a multi-TRP transmission mode across cells, and the first field can indicate the above content. The terminal device determines through the first field whether to send a random access request based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource.

[0041] Based on the first aspect or the second aspect, in a possible implementation method, if the PDCCH is sent through the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the service cell, then the random access request is sent according to the path loss corresponding to the first path loss resource; or, if the PDCCH is sent through the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell, then the random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, then the random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell corresponding to the PDCCH, then the random access request is sent according to the path loss corresponding to the first path loss resource. Thus, in the multi-TRP transmission mode across cells, the terminal device determines, based on the first field, whether to send a random access request based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource. This enables the terminal device to select the appropriate path loss to send a random access request, thereby enabling the acquisition of the TA value in the multi-TRP transmission mode.

[0042] Based on the first aspect or the second aspect, in one possible implementation, when the fourth condition is met, the PDCCH includes the first field; wherein the fourth condition includes one or more of the following: two TAGs are configured in the serving cell corresponding to the PDCCH; or two control channel groups are configured in the serving cell corresponding to the PDCCH. That is, when the fourth condition is met, the network device sends a PDCCH including the first field to the terminal device. This facilitates the terminal device to select an appropriate path loss to send a random access request in multi-TRP transmission mode.

[0043] Based on the first aspect or the second aspect, in one possible implementation, the third field in the PDCCH is used to indicate that the cell corresponding to the random access procedure is the serving cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access procedure is an activated supplementary cell associated with the serving cell; the random access response message includes a TA value; if the cell corresponding to the random access procedure is the serving cell, the TA value is the TA value corresponding to the first TAG of the serving cell; or, if the cell corresponding to the random access procedure is an activated supplementary cell associated with the serving cell, the TA value is the TA value corresponding to the second TAG of the serving cell. This enables the terminal device to determine the TAG corresponding to the TA value fed back in the random access response.

[0044] A third aspect of the present application provides a first communication device, including:

[0045] a transceiver module, configured to receive a PDCCH from the second communication device, where the PDCCH is used to trigger a random access procedure between the first communication device and the second communication device;

[0046] a processing module, configured to determine, based on first information in the PDCCH, a path loss corresponding to a first path loss resource or a path loss corresponding to a second path loss resource, where the first path loss resource is a QCL resource in a TCI state adopted by the PDCCH, and the second path loss resource is an SSB resource indicated in the PDCCH;

[0047] The transceiver module is further configured to send a random access request to the second communication device according to the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource.

[0048] A fourth aspect of the present application provides a second communication device, including:

[0049] A transceiver module is used to send a PDCCH to a first communication device, where the PDCCH is used to trigger a random access process between the first communication device and the second communication device; and receive a random access request from the first communication device, where the random access request is sent based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource determined based on the first information in the PDCCH, where the first path loss resource is a QCL resource in the TCI state adopted by the PDCCH, and the second path loss resource is an SSB resource indicated in the PDCCH.

[0050] Based on the third aspect or the fourth aspect, in a possible implementation manner, the first information is the first field in the PDCCH.

[0051] Based on the third aspect or the fourth aspect, in one possible implementation, the first field is used to indicate a TAG; if the TAG indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, a random access request is sent based on the path loss corresponding to the first path loss resource; or, if the TAG indicated by the first field is different from the TAG associated with the TCI state used by the PDCCH, a random access request is sent based on the path loss corresponding to the second path loss resource. Optionally, the implementation can also be described as: the first field is used to indicate whether the TAG corresponding to the random access procedure triggered by the PDCCH is the same as the TAG associated with the TCI state used by the PDCCH; if they are the same, a random access request is sent based on the path loss corresponding to the first path loss resource; if they are different, a random access request is sent based on the path loss corresponding to the second path loss resource.

[0052] Based on the third aspect, in a possible implementation method, the transceiver module is also used to: receive a random access response from the second communication device, the random access response includes a second field, the second field is used to indicate the TAG corresponding to the TA value carried in the random access response, and the TAG indicated by the second field is the same as the TAG indicated by the first field.

[0053] Based on the fourth aspect, in a possible implementation method, the transceiver module is also used to: send a random access response to the first communication device, the random access response includes a second field, the second field is used to indicate the TAG corresponding to the TA value carried in the random access response, and the TAG indicated by the second field is the same as the TAG indicated by the first field.

[0054] Based on the third aspect or the fourth aspect, in a possible implementation, the first field is used to indicate a control channel group identifier; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource. Optionally, the implementation can also be described as: the first field is used to indicate whether the control channel group identifier corresponding to the random access process triggered by the PDCCH is the same as the control channel group identifier corresponding to the PDCCH; if they are the same, a random access request is sent according to the path loss corresponding to the first path loss resource; if they are different, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0055] Based on the third aspect, in a possible implementation method, the transceiver module is also used to: receive a random access response from a second communication device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response message; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0056] Based on the fourth aspect, in a possible implementation method, the transceiver module is also used to: send a random access response to the first communication device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response message; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0057] Based on the third aspect or the fourth aspect, in a possible implementation method, the first field is used to indicate that the random access process is a first type of random access process or a second type of random access process; if the random access process is a first type of random access process, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the random access process is a second type of random access process, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0058] Based on the third aspect or the fourth aspect, in a possible implementation, the first type of random access procedure includes: a random access procedure in which the TRP corresponding to the first type of random access procedure is the same as the TRP for sending the PDCCH; in other words, the TRP corresponding to the first type of random access procedure is the same as the TRP for sending the PDCCH, or if the TRP corresponding to the random access procedure is the same as the TRP for sending the PDCCH, then the random access procedure is the first type of random access procedure. Or,

[0059] A random access process of the first type corresponds to a TAG that is the same as the TAG associated with the TCI state adopted by the PDCCH; in other words, the TAG corresponding to the first type of random access process is the same as the TAG associated with the TCI state adopted by the PDCCH; or if the TAG corresponding to the random access process is the same as the TAG associated with the TCI state adopted by the PDCCH, then the random access process is a first type of random access process.

[0060] or,

[0061] A random access procedure of the first type is a random access procedure in which the control channel group identifier corresponding to the PDCCH is the same as the control channel group identifier corresponding to the first type of random access procedure. In other words, the control channel group identifier corresponding to the first type of random access procedure is the same as the control channel group identifier corresponding to the PDCCH; or if the control channel group identifier corresponding to the random access procedure is the same as the control channel group identifier corresponding to the PDCCH, then the random access procedure is a first type of random access procedure.

[0062] Based on the third aspect or the fourth aspect, in one possible implementation, the second type of random access procedure includes: a random access procedure in which a TRP corresponding to the second type of random access procedure is different from a TRP for sending a PDCCH; in other words, if the TRP corresponding to the second type of random access procedure is the same as the TRP for sending the PDCCH, or if the TRP corresponding to the random access procedure is different from the TRP for sending the PDCCH, then the random access procedure is the second type of random access procedure. Thus, the second type of random access procedure is defined from the perspective of TRP.

[0063] or,

[0064] A random access process in which the TAG corresponding to the second type of random access process is different from the TAG associated with the TCI state adopted by the PDCCH; in other words, the TAG corresponding to the second type of random access process is the same as the TAG associated with the TCI state adopted by the PDCCH, or if the TAG corresponding to the random access process is different from the TAG associated with the TCI state adopted by the PDCCH, then the random access process is a second type of random access process.

[0065] or,

[0066] A random access procedure of the second type is a random access procedure in which the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH. In other words, if the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH, or if the control channel group identifier corresponding to the random access procedure is different from the control channel group identifier corresponding to the PDCCH, then the random access procedure is a random access procedure of the second type.

[0067] Based on the third aspect, in a possible implementation method, the transceiver module is also used to: receive a random access response from a second communication device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the random access process is a first type of random access process, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the random access process is a second type of random access process, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0068] Based on the fourth aspect, in a possible implementation method, the transceiver module is also used to: receive a random access response from the first communication device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the random access process is a first type of random access process, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the random access process is a second type of random access process, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0069] Based on the third aspect or the fourth aspect, in a possible implementation manner, the first field is used to indicate whether to send a random access request according to a path loss corresponding to the first path loss resource or to indicate whether to send a random access request according to a path loss corresponding to the second path loss resource.

[0070] Based on the third aspect, in a possible implementation method, the transceiver module is also used to: receive a random access response from the second communication device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the first field indicates that a random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the first field indicates that a random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0071] Based on the fourth aspect, in a possible implementation method, the transceiver module is also used to: send a random access response to the first communication device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the first field indicates that a random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the first field indicates that a random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0072] Based on the third aspect or the fourth aspect, in one possible implementation method, the first field is used to indicate the SSB resource; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0073] Based on the third aspect, in a possible implementation method, the transceiver module is also used to: receive a random access response from a second communication device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA carried in the random access response; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0074] Based on the fourth aspect, in a possible implementation method, the transceiver module is also used to: send a random access response to the first communication device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0075] Based on the third aspect or the fourth aspect, in one possible implementation method, when the first condition is met, the PDCCH includes first information; wherein the first condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or, there is no associated supplementary cell configured in the service cell corresponding to the PDCCH.

[0076] Based on the third aspect or the fourth aspect, in a possible implementation method, when the second condition is met, the first field is used to indicate the TAG, or the first field is used to indicate whether the TAG corresponding to the random access process is the same as the TAG corresponding to the TCI state adopted by the PDCCH, or the first field is used to indicate the control channel group identifier, or the first field is used to indicate whether the control channel group identifier corresponding to the random access process is the same as the control channel group identifier corresponding to the PDCCH, or the first field is used to indicate that the random access process is a first type of random access process or a second type of random access process, or the first field is used to indicate sending a random access request according to the path loss corresponding to the first path loss resource or indicating sending a random access request according to the path loss corresponding to the second path loss resource; wherein the second condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or no associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0077] Based on the third aspect or the fourth aspect, in a possible implementation method, when the third condition is met, the first field is used to indicate that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell; wherein the third condition includes at least one of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or, an associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0078] Based on the third aspect or the fourth aspect, in a possible implementation method, if the PDCCH is sent through the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the service cell, then the random access request is sent according to the path loss corresponding to the first path loss resource; or, if the PDCCH is sent through the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell, then the random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, then the random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell corresponding to the PDCCH, then the random access request is sent according to the path loss corresponding to the first path loss resource.

[0079] Based on the third aspect or the fourth aspect, in one possible implementation method, when the fourth condition is met, the PDCCH includes a first field; wherein the fourth condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; or, two control channel groups are configured in the service cell corresponding to the PDCCH.

[0080] Based on the third aspect or the fourth aspect, in a possible implementation method, the third field in the PDCCH is used to indicate that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell; the random access response message includes a TA value; if the cell corresponding to the random access process is the service cell, the TA value is the TA value corresponding to the first TAG of the service cell; or, if the cell corresponding to the random access process is an activated supplementary cell associated with the service cell, the TA value is the TA value corresponding to the second TAG of the service cell.

[0081] In a fifth aspect, the present application provides a communication device, comprising: a processor and a memory. The memory stores a computer program or computer instructions, and the processor is configured to call and execute the computer program or computer instructions stored in the memory, so that the processor implements any one of the implementations of the first or second aspects.

[0082] Optionally, the communication device further includes a transceiver, and the processor is used to control the transceiver to transmit and receive signals.

[0083] In a sixth aspect, the present application provides a communication device, comprising a processor and an interface circuit, wherein the processor is configured to communicate with other devices via the interface circuit and execute the method described in the first or second aspect.

[0084] In a seventh aspect, the present application provides a communication device comprising a processor, connected to a memory, configured to call a program stored in the memory to execute the method described in the first or second aspect. The memory may be located within or outside the communication device. The processor may include one or more processors.

[0085] In one implementation, the communication devices of the third to seventh aspects mentioned above may be a chip or a chip system.

[0086] An eighth aspect of the present application provides a computer program product comprising computer instructions, characterized in that when the computer program product is run on a computer, the computer is enabled to execute any one of the implementation methods of the first aspect or the second aspect.

[0087] In a ninth aspect, the present application provides a computer-readable storage medium comprising computer instructions, which, when executed on a computer, enable the computer to execute any one of the implementations of the first or second aspects.

[0088] In a tenth aspect, the present application provides a chip device, comprising a processor for calling a computer program or computer instruction in a memory so that the processor executes any one of the implementations of the first or second aspect described above.

[0089] Optionally, the processor is coupled to the memory via an interface.

[0090] In the eleventh aspect of the present application, a communication system is provided, which includes a terminal device and a network device; the terminal device is used to execute the method shown in the first aspect, and the network device is used to execute the method shown in the second aspect.

[0091] Through the above technical solution, it can be known that the terminal device receives a PDCCH from the network device, and the PDCCH is used to trigger a random access process between the terminal device and the network device. The terminal device determines the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource based on the first information in the PDCCH. The first path loss resource is the QCL resource in the TCI state adopted by the PDCCH, and the second path loss resource is the SSB resource indicated in the PDCCH. The terminal device sends a random access request to the network device based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource. Thereby, the terminal device selects the appropriate path loss to send a random access request, thereby enabling the acquisition of the TA value in the multi-TRP transmission mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] FIG1 is a schematic diagram of a communication system according to an embodiment of the present application;

[0093] FIG2 is another schematic diagram of a communication system according to an embodiment of the present application;

[0094] FIG3 is a schematic diagram of a multi-TRP transmission mode in the same cell according to an embodiment of the present application;

[0095] FIG4 is a schematic diagram of a multi-TRP transmission mode across cells according to an embodiment of the present application;

[0096] FIG5 is a schematic diagram of TA values ​​according to an embodiment of the present application;

[0097] FIG6 is a schematic diagram of an embodiment of a random access method according to an embodiment of the present application;

[0098] FIG7 is a schematic structural diagram of a communication device according to an embodiment of the present application;

[0099] FIG8 is another schematic structural diagram of a communication device according to an embodiment of the present application;

[0100] FIG9 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

[0101] FIG10 is a schematic structural diagram of a network device according to an embodiment of the present application. DETAILED DESCRIPTION

[0102] An embodiment of the present application provides a random access method and related apparatus for enabling a terminal device to select an appropriate path loss to send a random access request, thereby enabling the acquisition of a TA value in a multi-TRP transmission mode.

[0103] 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 embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0104] References to "one embodiment" or "some embodiments" in this application mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0105] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "plurality" means two or more. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c; a and b; a and c; b and c; or a, b, and c. Among them, a, b, and c can be single or multiple.

[0106] It is understood that in this application, "indication" can include direct indication, indirect indication, explicit indication, and implicit indication. When describing that a certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0107] The technical solutions of the present application can be applied to various communication systems. For example, the fifth generation mobile communication (5G) system, the new radio (NR) system, the long term evolution (LTE) system, the LTE frequency division duplex (FDD) system, the LTE time division duplex (TDD) system, the universal mobile telecommunication system (UMTS), future communication systems after the 5G network, the vehicle to everything (V2X) communication system, the device to device (D2D) communication system, the Internet of Things communication system, the industrial Internet communication system, or the satellite communication system. The wireless communication systems involved in this application also include but are not limited to: narrowband Internet of Things (NB-IoT) system, global system for mobile communications (GSM), enhanced data rate for GSM evolution (EDGE), wideband code division multiple access (WCDMA), code division multiple access 2000 (CDMA2000), or time division-synchronization code division multiple access (TD-SCDMA).

[0108] The communication system to which this application is applicable includes network equipment and terminal equipment. The network equipment and terminal equipment are introduced below.

[0109] The terminal device may be a wireless terminal device capable of receiving network device scheduling information and instruction information. The terminal device may be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connection function, or other processing device connected to a wireless modem.

[0110] Terminal equipment, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), or customer premise equipment (CPE), is a device that includes wireless communication capabilities (providing voice / data connectivity to users). For example, it can be a handheld device or vehicle-mounted device with wireless connectivity. Currently, some examples of terminal equipment include mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in the Internet of Vehicles (IoV), wireless terminals in self-driving cars, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. For example, wireless terminals in unmanned driving can be drones, helicopters, or airplanes. For example, wireless terminals in the Internet of Vehicles can be onboard equipment, complete vehicle equipment, onboard modules, vehicles, or ships. Wireless terminals in industrial control can be cameras, robots, or robotic arms. Wireless terminals in smart homes can be televisions, air conditioners, vacuum cleaners, speakers, or set-top boxes.

[0111] It should be noted that the terminal device can be a device or apparatus with a chip, or a device or apparatus with an integrated circuit, or a chip, chip system, module or control unit in the device or apparatus shown above, and this application does not limit it specifically. It should be noted that in this application, when referring to a terminal device, it can refer to the terminal device itself, or it can refer to a chip, functional module or integrated circuit in the terminal device that performs the method provided in this application, and this application does not limit it specifically.

[0112] A network device may be a device in a wireless network. For example, a network device may be a device deployed in a radio access network that provides wireless communication capabilities for terminal devices. For example, a network device may be a radio access network (RAN) node that connects a terminal device to a wireless network. The network device may also be referred to as an access network device, a RAN entity, an access node, a network node, or a communication device.

[0113] Specifically, the network device may be an access network device for a cellular system related to the Third Generation Partnership Project (3GPP). For example, a 4G communication system or a 5G communication system. The network device may also be an access network device in an open access network (O-RAN or ORAN) or a cloud radio access network (CRAN). Alternatively, the network device may be an access network device in a communication system obtained by integrating two or more of the above communication systems.

[0114] The network device includes, but is not limited to, an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., a home evolved NodeB, or a home Node B, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WIFI) system, a macro base station, a micro base station, a wireless relay node, a donor node, a wireless controller in a CRAN scenario, a wireless backhaul node, a transmission point (TP), or a transmission and receiving point (TRP), and may also be a network device in a 5G mobile communication system. For example, a next generation NodeB (gNB), a TRP, or a TP in an NR system; or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G mobile communication system; or the network device may also be a network node constituting a gNB or a transmission point. For example, a centralized unit (CU), a distributed unit (DU), a centralized unit control plane (CU-CP), a centralized unit user plane (CU-UP), or a radio unit (RU), etc. The CU and DU can be set separately, or can also be included in the same network element, such as a BBU. The RU can be included in a radio frequency device or a radio frequency unit. For example, in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). Alternatively, the network device can also be a server, a wearable device, a vehicle, or an on-board device, etc. For example, the access network device in the V2X technology can be a road side unit (RSU).

[0115] It should be noted that in different systems, CU (or CU-CP and CU-UP), DU or RU may have different names, but those skilled in the art can understand their meanings. For example, in an open radio access network (ORAN) system, CU may also be called an open centralized unit (O-CU) or an open CU, DU may also be called an open distributed unit (O-DU), CU-CP may also be called an open centralized unit control plane (O-CU-CP), CU-UP may also be called an open centralized unit user plane (O-CU-UP), and RU may also be called an open radio unit (O-RU). This application does not limit this. Any of the CU, CU-CP, CU-UP, DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0116] Optionally, for network elements in the ORAN system, each network element may implement the protocol layer functions shown in Table 1 below.

[0117] Table 1

[0118] It should be noted that, in the ORAN system, the network device in this application may be one or more network elements in Table 1 above.

[0119] The following describes the architecture of the CU and DU of an access network device. The access network device includes at least one CU and at least one DU. Optionally, the access network device also includes at least one RU.

[0120] The following is an introduction using the example of an access network device including a CU and a DU. The CU has some functions of the core network, and the CU may include a CU-CP and a CU-UP. The CU and the DU may be configured according to the protocol layer functions of the wireless network they implement. For example, the CU is configured to implement the functions of the packet data convergence protocol (PDCP) layer and the protocol layers above it (for example, the RRC layer and / or the SDAP layer). The DU is configured to implement the functions of the protocol layers below the PDCP layer (for example, the RLC layer, the MAC layer, and / or the physical (PHY) layer). For another example, the CU is configured to implement the functions of the protocol layers above the PDCP layer (such as the RRC layer and / or the SDAP layer), and the DU is configured to implement the functions of the PDCP layer and the protocol layers below it (for example, the RLC layer, the MAC layer, and / or the PHY layer, etc.).

[0121] When a CU includes a CU-CP and a CU-UP, the CU-CP is used to implement the control plane functions of the CU, and the CU-UP is used to implement the user plane functions of the CU. For example, when the CU is configured to implement the functions of the PDCP layer, RRC layer, and SDAP layer, the CU-CP is used to implement the RRC layer functions and the control plane functions of the PDCP layer, and the CU-UP is used to implement the SDAP layer functions and the user plane functions of the PDCP layer.

[0122] The CU-CP can interact with network elements in the core network that implement control plane functions. The network elements in the core network that implement control plane functions can be access and mobility function network elements, such as the access and mobility management function (AMF) in the 5G system. The access and mobility function network element is responsible for mobility management in the mobile network, such as location update of terminal devices, registration network of terminal devices, and switching of terminal devices.

[0123] The CU-UP can interact with network elements in the core network that implement user plane functions. Network elements in the core network that implement user plane functions, such as the user plane function (UPF) in the 5G system, are responsible for forwarding and receiving data in terminal devices.

[0124] The above configuration of CU and DU is only an example, and the functions of CU and DU can also be configured as needed. For example, the CU or DU can be configured to have the functions of more protocol layers, or the CU or DU can be configured to have partial processing functions of the protocol layer. For example, some functions of the RLC layer and the functions of the protocol layers above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are set in the DU. For another example, the functions of the CU or DU can be divided according to the service type or other system requirements. For example, according to the delay, the functions whose processing time needs to meet the smaller delay requirement are set in the DU, and the functions that do not need to meet the delay requirement are set in the CU.

[0125] The DU and RU can work together to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of the DU and RU can be configured in various ways according to the design. For example, the DU is configured to implement the baseband function, and the RU is configured to implement the mid-RF function. For another example, the DU is configured to implement the high-layer functions in the PHY layer, and the RU is configured to implement the low-layer functions in the PHY layer or to implement the low-layer functions and the RF functions. The high-layer functions in the physical layer may include a part of the functions of the physical layer, which is closer to the MAC layer, and the low-layer functions in the physical layer may include another part of the functions of the physical layer, which is closer to the mid-RF side.

[0126] It should be noted that the network device can be a device or apparatus with a chip, or a device or apparatus with an integrated circuit, or a chip, chip system, module or control unit in the aforementioned device or apparatus, and this application does not limit this. It should be noted that in this application, when referring to a network device, it can refer to the network device itself, or it can refer to a chip, functional module or integrated circuit in the network device that performs the method provided in this application, and this application does not limit this.

[0127] It should be noted that the concepts of network devices and TRPs are mentioned together in this application. Network devices can be understood as a general term for all devices (including sites) on the network side. For example, multiple TRPs can be collectively referred to as network devices. TRP refers to a transmission node located at a specific physical location. In other words, network devices conceptually include TRPs. That is, network devices can include one TRP or multiple TRPs.

[0128] To facilitate understanding of the technical solutions of the embodiments of the present application, two possible communication systems to which the method provided in the embodiments of the present application is applicable are shown below in conjunction with FIG1 and FIG2 .

[0129] Figure 1 is a schematic diagram of a communication system according to an embodiment of the present application. As shown in Figure 1 , the communication system includes at least one network device and at least one terminal device. For example, network device 111, terminal device 121, and terminal device 122 are shown in Figure 1 . Network device 111 can communicate with terminal devices 121 and 122.

[0130] Figure 2 is another schematic diagram of a communication system according to an embodiment of the present application. As shown in Figure 2 , the communication system may include at least two network devices and at least one terminal device. For example, network device 211, network device 212, network device 213, and terminal device 221 are shown in Figure 2 . Terminal device 221 may be provided with communication services by multiple network devices. For example, as shown in Figure 2 , network device 211 may transmit to terminal device 221, and network device 212 may transmit to terminal device 221. Network device 213 may also transmit to terminal device 221. In other words, a single terminal device may be provided with communication services by multiple network devices simultaneously.

[0131] The technical terms involved in this application are introduced below.

[0132] 1. Beam: A beam is a communication resource. It can be wide, narrow, or any other type of beam. Beam formation can be achieved through beamforming or other techniques. Beamforming techniques include digital beamforming, analog beamforming, and hybrid digital / analog beamforming. Different beams can be considered different resources.

[0133] In the NR protocol, beam can be called spatial domain filter, spatial filter, spatial domain parameter, spatial parameter, spatial parameter, spatial domain setting, spatial setting, quasi-colocation (QCL) information, QCL assumption, or QCL indication, etc. The beam can be indicated by the transmission configuration indicator state (TCI-state) parameter or by the spatial relation parameter. Therefore, in this application, beam can be replaced by spatial domain filter, spatial filter, spatial domain parameter, spatial parameter, spatial setting, spatial setting, quasi-colocation (QCL) information, QCL assumption, QCL indication, TCI-state) (including uplink TCI-state, downlink TCI-state), or spatial relationship, etc. The above terms are also equivalent to each other. Beam can also be replaced by other terms representing beams, which are not limited in this application.

[0134] The transmitter can send the same or different information via different beams. Alternatively, 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.

[0135] A beam used to transmit a signal may be referred to as a transmission beam (Tx beam), a spatial domain transmission filter, a spatial transmission filter, a spatial domain transmission parameter, a spatial transmission parameter, a spatial domain transmission setting, or a spatial transmission setting. An uplink transmit beam may be indicated by any of a spatial relationship, a TCI-state, and a sounding reference signal (SRS) resource (indicating a transmit beam using the SRS). Therefore, an uplink transmit beam may also be replaced by an SRS resource.

[0136] A beam used to receive a signal may be referred to as a reception beam (Rx beam), 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.

[0137] For example, a transmit beam can refer to the distribution of signal strength in different directions in space after a signal is transmitted by an antenna, while a receive beam can refer to the distribution of signal strength in different directions in space after a wireless signal is received by an antenna. It is understood that the one or more antenna ports that form a beam can also be considered an antenna port set.

[0138] When using low- or medium-frequency bands, the transmitter can send signals omnidirectionally or across a wide angle. When using high-frequency bands, thanks to the shorter carrier wavelength of high-frequency communication systems, antenna arrays consisting of multiple antenna elements can be deployed at both the transmitter and receiver ends. The transmitter transmits signals with specific beamforming weights, forming a spatially directional beam. Simultaneously, the receiver receives the signals using an antenna array with specific beamforming weights. This helps improve the received signal power at the receiver and combats path loss.

[0139] 2. QCL: Quasi-colocation relationship is used to indicate that multiple resources have one or more identical or similar communication characteristics. For multiple resources with a quasi-colocation relationship, the same or similar communication configuration can be adopted. For example, if two antenna ports have a quasi-colocation relationship, the large-scale characteristics of the channel for transmitting a symbol on one port can be inferred from the large-scale characteristics of the channel for transmitting a symbol on the other port. Large-scale characteristics may include: delay spread, average delay, Doppler spread, Doppler shift, average gain, receiving parameters, terminal device receiving beam number, transmit / receive channel correlation, receive arrival angle, receiver antenna spatial correlation, main angle of arrival (AoA), average arrival angle, AoA spread, etc. Specifically, the colocation indication is used to indicate whether at least two groups of antenna ports have a colocation relationship, including: the colocation indication is used to indicate whether the channel state information reference signals sent by at least two groups of antenna ports come from the same transmission point, or the colocation indication is used to indicate whether the channel state information reference signals sent by at least two groups of antenna ports come from the same beam group.

[0140] 3. TCI: It can also be called TCI state (TCI-state). In uplink and downlink transmission, the correct beam needs to be used between the network device and the terminal device to achieve correct transmission. In downlink transmission, the network device needs to indicate to the terminal device the downlink transmission beam it uses. The terminal device can determine the appropriate receiving beam based on the downlink transmission beam, and the receiving beam is used to receive information from the network device. In uplink transmission, the network device also needs to indicate to the terminal device which uplink transmission beam the terminal device uses to send information to the network device. The network device can determine the uplink transmission beam with better signal quality for the terminal device. Both the uplink transmission beam and the downlink transmission beam can be indicated by the corresponding TCI state. Specifically, the downlink transmission beam can be indicated by the downlink TCI state, and the uplink transmission beam can be indicated by the uplink TCI state.

[0141] In the 3GPP protocol, the network device can indicate the TCI state to the terminal device through the TCI field in the downlink control information (DCI). The size of the TCI field is 3 bits and can be specifically expressed as 8 different field values ​​(codepoints). Each field value of the TCI field can be associated with an index of a TCI state. The index of the TCI state can uniquely identify a TCI state, and the TCI state can be a downlink TCI state or an uplink TCI state. Each field value of the TCI field can also be associated with two TCI state indexes, and the two TCI state indexes can uniquely identify two TCI states, and the two TCI states can include a downlink TCI state and an uplink TCI state.

[0142] The downlink TCI state includes several parameters that allow the terminal device to determine the relevant information of the downlink transmit beam and thus determine the appropriate receive beam to receive information from the network device. The TCI state is configured by the network device for each terminal device. The structure of the downlink TCI state is as follows:

[0143] Each TCI state includes its own index (tci-StateId) and two quasi-colocation information (QCL-info). Each QCL-info includes a reference signal resource, which is used to indicate that the downlink transmission of the TCI state should use the same downlink timing, frequency offset or receiving beam as the reference signal resource. It is specifically determined by the type of the QCL-info. The QCL type can have four values ​​{typeA, typeB, typeC, typeD}. When the QCL type is typeA, typeB and typeC, the downlink transmission should be carried out using the same downlink timing and frequency offset as the reference signal resource. When the QCL type is typeD, the downlink transmission should be carried out using the same receiving beam as the reference signal resource. Of the two QCL-infos mentioned above, one is of typeD and the other is of typeA or typeB or typeC. The terminal device can determine which receiving beam to use to receive the corresponding downlink transmission through the QCL-info of typeD. The specific execution steps are as follows:

[0144] The network device indicates a downlink TCI state to the terminal device through DCI. The terminal device determines the reference signal resource in the QCL information of type D in the downlink TCI state. The terminal device uses the receiving beam of the reference signal resource as the receiving beam used for downlink transmission. It should be noted that the receiving beam of the reference signal resource is obtained by the terminal device in advance through the beam management process. Through the beam management process, the terminal device can determine which receiving beam is best to receive the reference signal resource, and use the receiving beam as the receiving beam of the reference signal resource.

[0145] The uplink TCI state includes a reference signal resource, which is used to indicate that the uplink transmission using this TCI state should use the same uplink transmit beam as the reference signal resource. The terminal device can determine which transmit beam to use for uplink transmission through this reference signal resource. In the uplink TCI state, the reference signal resource is not included in the QCL-info, and the QCL type is not distinguished, because there is no need to refer to the uplink timing and frequency offset information, only the uplink transmit beam. The structure of the uplink TCI state is shown below:

[0146] The specific steps are as follows:

[0147] The network device indicates a certain uplink TCI state to the terminal device through the DCI. The terminal device determines the reference signal resource in the uplink TCI state. The terminal device uses the transmit beam of the reference signal resource as the transmit beam used by the terminal device for uplink transmission. It should be noted that the transmit beam of the reference signal resource is obtained by the terminal device in advance through the beam management process.

[0148] The following describes the configuration, activation and indication of TCI status.

[0149] TCI-state configuration: The network device configures multiple TCI-states to the terminal device through RRC signaling. These TCI-states all include a QCL-Info of type D. The network device can also configure TCI-states that do not include QCL-info of type D. However, these TCI-states are not used to indicate data transmission beams and are not further explained here.

[0150] TCI-state activation: After a network device is configured with multiple TCI-states, it must activate eight of them through a media access control element (MAC-CE). These eight TCI-states correspond one-to-one to the eight values ​​of the TCI field in the DCI. That is, the MACCE determines which TCI-states the eight values ​​of the DCI TCI field correspond to.

[0151] 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 that the data transmission beam adopts the TCI state corresponding to 000. The reference signal contained in the QCL-Info of type D in this TCI state is the channel state information-reference signal (CSI-RS) 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 beam corresponding to the data transmission beam, and thus adopt the corresponding beam to send or receive data.

[0152] It should be noted that the three descriptions of TCI state, TCI-state and TCI state in this article can be used interchangeably.

[0153] Single TRP transmission mode: The terminal device transmits with a single TRP.

[0154] Multi-TRP transmission mode: The terminal device transmits with multiple TRPs. The multi-TRP transmission mode is divided into the multi-TRP transmission mode within the same cell and the multi-TRP transmission mode across cells.

[0155] The multi-TRP transmission mode in the same cell means that both TRPs correspond to the same serving cell, that is, one cell includes two network devices or two TRPs. The two network devices or two TRPs can be combined to achieve joint transmission. Figure 3 is a schematic diagram of the multi-TRP transmission mode in the same cell of an embodiment of the present application. As shown in Figure 3, TRP301 and TRP302 both correspond to cell 1, and terminal device 303 is located in cell 1. TRP301 and TRP302 can provide communication services for terminal device 303.

[0156] Cross-cell multi-TRP transmission mode involves two TRPs corresponding to different cells, combining the TRPs of the two cells for joint transmission. In cross-cell multi-TRP transmission, one TRP corresponds to a serving cell and the other to a supplementary cell. As shown in Figure 4, TRP 401 corresponds to cell 1 and TRP 402 corresponds to cell 2. Cell 1 is the serving cell and cell 2 is the supplementary cell. TRP 401 and TRP 402 can jointly provide communication services for terminal device 403.

[0157] Serving cell: A cell configured by the network for data transmission by a terminal device. The network device needs to configure all parameters of the serving cell to the terminal device, and the terminal device can independently transmit data through the serving cell. The serving cell corresponding to the PDCCH is one of the serving cells configured by the network device for the terminal device.

[0158] Supplementary cell: In addition to the service cell, the network device can also configure one or more supplementary cells for the terminal device, and the supplementary cell can be used for data transmission to a certain extent. The network device does not need to configure all the parameters of the supplementary cell to the terminal device, but configures the information of the supplementary cell as the parameters of the service cell to the terminal device. The supplementary cell depends on the service cell associated with the supplementary cell to work. The network device can configure multiple supplementary cells for a service cell, but only one supplementary cell is activated at the same time. The network device can use a service cell and the activated supplementary cell corresponding to the service cell for joint transmission, that is, the cross-cell multi-TRP transmission mode mentioned above. In other words, in the cross-cell multi-TRP scenario, the service cell can be configured with an associated supplementary cell. The supplementary cell can be specifically represented by an additional physical cell index.

[0159] TA value: Used for uplink transmission by a terminal device. Specifically, it refers to the time that the terminal device sends an uplink frame of uplink data ahead of the downlink frame it receives. The TA value can be obtained through the random access process. In multi-TRP transmission mode, the distance between each TRP and the terminal device is different. For the terminal device, each TRP is associated with a TA value.

[0160] TAG: A parameter used for TA value management, each TAG corresponds to a TA value. In the single TRP transmission mode, each service cell corresponds to a TAG, and the terminal device needs to use the TA value corresponding to the TAG corresponding to the service cell for uplink transmission in the service cell. In the multi-TRP transmission mode, each service cell corresponds to two TAGs, and each TAG corresponds to a TRP corresponding to the service cell. The terminal device needs to use the TA value corresponding to the TAG corresponding to the TRP for uplink transmission to the TRP. Regardless of the multi-TRP transmission mode in the same cell or the multi-TRP transmission mode across cells, two TAGs need to be configured in the configuration parameters of the service cell to maintain the TA values ​​corresponding to the two TRPs respectively.

[0161] Control channel grouping: This grouping is used to group control channels in a serving cell. Each control channel group corresponds to a Transmission Relay Protocol (TRP). Each control channel group has an identifier, called a control channel group identifier. Whether using multiple TRPs within the same cell or across multiple cells, two control channel groups must be configured in the serving cell's configuration parameters.

[0162] In 5G communication systems, both uplink and downlink transmissions are based on time slots, meaning that data is transmitted once per time slot. The network device's time slot start time is fixed, and the uplink and downlink time slots of the network device are aligned. The start time of the uplink and downlink time slots of the terminal device is determined based on the start time of the network device's uplink and downlink time slots and the signal propagation time between the network device and the terminal device. As shown in Figure 5, since the signal propagation time between the network device and the terminal device is T, a signal sent by the network device at time t is not received by the terminal device until time t+T. Therefore, the start time of the terminal device's downlink time slot is T later than the start time of the network device's downlink time slot. Conversely, since the signal propagation time between the network device and the terminal device is T, a signal sent by the terminal device at time tT is not received by the network device until time t. Therefore, the start time of the terminal device's uplink time slot is T earlier than the start time of the network device's uplink time slot. Therefore, the start time of the terminal device's uplink time slot is 2T earlier than the start time of the terminal device's downlink time slot. The time difference between the start time of the terminal device's uplink time slot and the start time of the terminal device's downlink time slot (i.e., 2T) is also called the TA value. For downlink transmission, the terminal device determines the start time of the terminal device's downlink time slot (i.e., t+T) by measuring the downlink pilot signal and receives the downlink signal based on the downlink time slot start time. For uplink transmission, the terminal device needs to determine the TA value as 2T, and based on the timing advance and the downlink time slot start time, determine the uplink time slot start time (i.e., the downlink time slot start time - TA value, i.e., tT) to send the uplink signal.

[0163] The TA value can be obtained through a random access process. Specifically, the terminal device sends a random access request to the network device. The random access request is sent through the downlink time slot of the terminal device, that is, the terminal device starts sending the random access request at the start time t+T of the downlink time slot of the terminal device. It takes time T for the random access request to reach the network device, that is, the network device receives the random access request at time t+T, resulting in the random access request being received 2T later than the start time of the uplink time slot of the network device. This time 2T is the TA value of the terminal device. The network device obtains a TA value of 2T by subtracting the start time t of the uplink time slot of the network device from the time the random access request is received (that is, time t+2T). The network device sends a random access response to the terminal device, and sends the TA value to the terminal device through the random access response. The terminal device can determine its corresponding TA value and use the TA value for transmission in subsequent uplink transmissions.

[0164] The above describes the TA value acquisition mechanism in single TRP transmission mode. In single TRP transmission mode, the terminal device only needs to determine one TA value for each serving cell. In multi-TRP transmission mode, the terminal device needs to send uplink signals to two TRPs. Since the transmission delay from the terminal device to the two TRPs may be different, the TA value used by the terminal device when sending uplink signals to the two TRPs should also be different. In this case, the terminal device needs to obtain the TA values ​​corresponding to the two TRPs respectively.

[0165] In the multi-TRP transmission mode, the network device sends a PDCCH to the terminal device, thereby triggering the terminal device to initiate a random access request. However, in the multi-TRP transmission mode, there are multiple TRPs, and the terminal device cannot know which TRP the random access request should be sent to. Therefore, the terminal device cannot send the random access request according to the correct path loss. As a result, in the multi-TRP transmission mode, the terminal device cannot obtain the TA value. The present application provides a corresponding technical solution for enabling the terminal device to select an appropriate path loss to send a random access request, thereby enabling the acquisition of the TA value in the multi-TRP transmission mode.

[0166] In this application, path loss can also be called path loss, and path loss resources can also be called path loss resources, path loss measurement resources, path loss measurement resources, or reference signal resources. This application does not limit the name of the path loss resource.

[0167] The technical solution of this application is introduced below in conjunction with specific embodiments.

[0168] FIG6 is a schematic diagram of an embodiment of a random access method according to an embodiment of the present application. Referring to FIG6 , the method includes:

[0169] 601. A network device sends a PDCCH to a terminal device. The PDCCH is used to trigger a random access process between the terminal device and the network device. Correspondingly, the terminal device receives the PDCCH from the network device.

[0170] The PDCCH is used to instruct the terminal device to send a random access request to the network device. The random access process triggered by the PDCCH may include the following step 603. Optionally, the random access process also includes the following step 604.

[0171] Optionally, the PDCCH includes at least one of the following: a random access preamble identifier, an SSB identifier, or a cell identifier. The PDCCH may also include other information, which is not specifically limited in this application.

[0172] The identifier of the random access preamble is used to indicate the random access preamble. The terminal device can send the random access preamble to the network device. It should be noted that the essence of the terminal device sending a random access request to the network device is that the terminal device sends a random access preamble to the network device.

[0173] The SSB identifier is used to indicate the beam used to send the random access preamble. For example, the terminal device determines the receive beam corresponding to the SSB identifier and determines the corresponding transmit beam based on the receive beam. The terminal device uses the transmit beam to send the random access preamble.

[0174] The cell identifier is used to indicate the cell targeted by the random access process triggered by the PDCCH, thereby facilitating the terminal device to determine the random access preamble and SSB identifier of the cell indicated by the cell identifier to send the random access request.

[0175] Optionally, the embodiment shown in FIG6 further includes step 601a. ​​Step 601a may be performed before step 601.

[0176] 601a: The network device sends configuration information to the terminal device. Correspondingly, the terminal device receives the configuration information from the network device.

[0177] The configuration information includes configuration parameters of the serving cell. For example, the configuration parameters of the serving cell include parameters related to uplink timing, such as TAG, control channel group identifier, and parameters related to the supplementary cell associated with the serving cell.

[0178] 602. The terminal device determines the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource according to the first information in the PDCCH.

[0179] The path loss corresponding to the first path loss resource is the signal propagation path loss between the terminal device and the network device, obtained by the terminal device by measuring the first path loss resource. Alternatively, the path loss corresponding to the first path loss resource is the signal propagation path loss between the terminal device and the network device, obtained by the terminal device by measuring the first path loss signal carried by the first path loss resource. The first path loss signal may also be referred to as a first reference signal or a first downlink reference signal. Specifically, the network device transmits the first path loss signal to the terminal device; in response, the terminal device receives the first path loss signal from the network device and measures the first path loss signal to obtain the signal propagation path loss between the terminal device and the network device.

[0180] The path loss corresponding to the second path loss resource is the signal propagation path loss between the terminal device and the network device, obtained by the terminal device by measuring the second path loss resource. Alternatively, the path loss corresponding to the first path loss resource is the signal propagation path loss between the terminal device and the network device, obtained by the terminal device by measuring the second path loss signal carried by the second path loss resource. The second path loss signal may also be referred to as a second reference signal or a second downlink reference signal. Specifically, the network device transmits the second path loss signal to the terminal device; in response, the terminal device receives the second path loss signal from the network device and measures the second path loss signal to obtain the signal propagation path loss between the terminal device and the network device.

[0181] Optionally, the first path loss resource may include any one of the following: a demodulation reference signal (DMRS) resource indicated in the PDCCH, a QCL resource adopted by the PDCCH, a QCL resource in the TCI state adopted by the PDCCH, a QCL resource in the first of two TCI states for downlink indicated by the network device to the terminal device, or a QCL resource in the second of two TCI states for downlink indicated by the network device to the terminal device.

[0182] Optionally, the second path loss resources may include any of the following: SSB resources indicated in the PDCCH, QCL resources in a TCI state indicated or activated by the network device to the terminal device (for example, QCL resources in the first or second TCI state indicated or activated by the network device to the terminal device), path loss resources associated with a TCI state indicated or activated by the network device to the terminal device (for example, path loss resources associated with the first or second TCI state indicated or activated by the network device to the terminal device, QCL resources in the TCI state associated with the TRP or TAG or control channel group corresponding to the random access process triggered by the PDCCH, or path loss resources associated with the TCI state associated with the TRP or TAG or control channel group corresponding to the random access process triggered by the PDCCH. The above-mentioned PDCCH refers to the PDCCH that triggers the random access process, that is, the PDCCH that carries the indication information mentioned later. The TCI-state associated with the TRP or TAG or control channel group identifier corresponding to the random access process may refer to the TRP or TAG or control channel group identifier corresponding to the random access process among multiple (such as two) TCI-states indicated by the network device to the terminal device. The TCI-state associated with the control channel group identifier. The TRP or TAG corresponding to the random access process or the TCI-state associated with the control channel group identifier may refer to one TCI-state in the group of TCI-states associated with the TRP or TAG or control channel group identifier corresponding to the random access process, among the multiple groups of TCI-states activated by the network device to the terminal device, such as the TCI-state with the smallest index, or the TCI-state with the smallest corresponding TCI field value. The association between the TAG and the TCI-state can be indicated by a configuration message, such as configuring an associated TAG for each TCI-state. The association between the control channel group and the TCI-state can be indicated by MAC-CE signaling, such as indicating a group of TCI-states and the control channel group identifier associated with the group of TCI-states through MAC-CE. The association between the control channel group and the TCI-state can be indicated by DCI signaling, such as indicating a TCI-state through the DCI corresponding to a control channel group identifier, then the TCI-state is associated with the control channel group identifier.

[0183] In one implementation, the second path loss resource is the SSB resource indicated in the PDCCH. It can be further stipulated that the SSB resource must be a QCL resource corresponding to one of the two TCI-states indicated by the network device for the terminal device, or a QCL resource of the QCL resource. Alternatively, the SSB resource must be a path loss resource corresponding to one of the two TCI-states indicated by the network device for the terminal device, or a QCL resource of the path loss resource. The above constraints are to ensure that the SSB indicated by the PDCCH is the QCL resource or path loss resource corresponding to the TCI-state being used by the terminal device, and have low complexity requirements for the terminal device.

[0184] In another implementation, the second path loss resource is the SSB resource indicated in the PDCCH. It can be further stipulated that the SSB resource must be a QCL resource corresponding to a TCI-state in the TCI-state activated by the network device for the terminal device, or a QCL resource of the QCL resource. Alternatively, the SSB resource must be a path loss resource corresponding to a TCI-state in the TCI-state activated by the network device for the terminal device, or a QCL resource of the path loss resource. The above constraints are to ensure that the SSB indicated by the PDCCH is a QCL resource or path loss resource corresponding to the TCI-state activated by the network device for the terminal device. The number of activated TCI-states is more than the number of indicated TCI-states, so this implementation has higher requirements on the complexity of the terminal device. The terminal device can report whether the terminal device supports this implementation through the terminal capability reporting process. For example, the protocol stipulates that the terminal device can support the former implementation by default, and as for the other implementation, it needs to be reported to the network device through the terminal capability parameters.

[0185] It should be understood that the first path loss resource and the second path loss resource in this application are not limited to the above definitions, and may also be other resources. In other words, when the first path loss resource and the second path loss resource are other resources, the solution in this application is still applicable.

[0186] When a terminal device sends a random access request, it needs to calculate the transmit power of the random access request. To calculate the transmit power of the random access request, the terminal device needs to determine the path loss generated by the signal transmission between the terminal device and the network device. The terminal device can determine the path loss between the terminal device and the network device by measuring the downlink reference signal. However, in the multi-TRP transmission mode, the transmit power of the random access request sent by the terminal device to different TRPs is different. This is because the signals sent by the terminal device to different TRPs experience different propagation path losses. Therefore, in order to use the correct path loss to calculate the correct transmit power, the terminal device needs to determine which TRP the random access process triggered by the PDCCH is for, that is, to which TRP the terminal device should send the random access request. The present application mainly involves two scenarios: a random access process triggered by the same TRP and a random access process triggered across TRPs.

[0187] The random access process triggered by the same TRP means that the TRP that sends the PDCCH and the TRP that receives the random access request of the terminal device (that is, the TRP corresponding to the random access process triggered by the PDCCH, which can be specifically understood as the terminal device initiating a random access process to the TRP) are the same TRP. If it is a random access process triggered by the same TRP, the random access request sent by the PDCCH-triggered terminal device is sent to the TRP that sent the PDCCH.

[0188] A random access procedure triggered across TRPs means that the TRP that sends the PDCCH and the TRP that receives the random access request from the terminal device (i.e., the TRP corresponding to the random access procedure triggered by the PDCCH, which can be specifically understood as the terminal device initiating a random access procedure to the TRP) are different TRPs. For example, TRP1 sends a PDCCH to the terminal device, and the TRP corresponding to the random access procedure triggered by the PDCCH is TRP2, and the terminal device sends a random access request to TRP2.

[0189] In different scenarios, the path loss resources used by the terminal device to calculate the path loss are different. The terminal device needs to distinguish between the above two scenarios so that the terminal device can use the correct path loss resources to calculate the path loss between the terminal device and the network device.

[0190] The first information in the PDCCH is used to determine the first path loss resource or the second path loss resource. Alternatively, the first information in the PDCCH is used to determine the path loss corresponding to the first path loss resource used to send the random access request, or to determine the path loss corresponding to the second path loss resource used to send the random access request. Alternatively, the first information in the PDCCH is used to determine whether to send the random access request based on the path loss corresponding to the first path loss resource or to determine whether to send the random access request based on the path loss corresponding to the second path loss resource. For specific implementation methods, please refer to the relevant description of step 603 below.

[0191] Optionally, the first information in the PDCCH is the first field in the PDCCH. For some possible implementations of the first field, please refer to the relevant introduction of step 603 below.

[0192] 603. The terminal device sends a random access request to the network device according to the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource. Correspondingly, the network device receives the random access request from the terminal device.

[0193] The terminal device calculates a first transmit power for sending a random access request based on the path loss corresponding to the first path loss resource, and sends the random access request to the network device using the first transmit power. Alternatively, the terminal device calculates a second transmit power for sending the random access request based on the path loss corresponding to the second path loss resource, and sends the random access request to the network device using the second transmit power.

[0194] The following describes some possible implementations of the first field in the PDCCH, in which the terminal device sends a random access request based on the path loss corresponding to the first path loss resource or sends a random access request based on the path loss corresponding to the second path loss resource. This application is still applicable to other implementations and is not specifically limited in this application.

[0195] Implementation 1: The first field is used to indicate the TAG. The TAG indicated by the first field represents the TAG corresponding to the random access procedure triggered by the PDCCH. If the TAG indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, a random access request is sent based on the path loss corresponding to the first path loss resource; alternatively, if the TAG indicated by the first field is different from the TAG associated with the TCI state used by the PDCCH, a random access request is sent based on the path loss corresponding to the second path loss resource.

[0196] Specifically, the first field is used to indicate a TAG, which is the TAG corresponding to the random access process triggered by the PDCCH, or the TAG indicated by the first field is the TAG corresponding to the random access process triggered by the PDCCH. Since the TAG corresponds to the TRP, that is, in the multi-TRP transmission mode, each TRP corresponds to a TAG, and different TRPs correspond to different TAGs. Therefore, the network device can indicate the TRP targeted by the random access process triggered by the PDCCH through the TAG indicated by the first field. In other words, the TAG corresponding to the random access process triggered by the PDCCH can be understood as the TAG corresponding to the TRP targeted by the random access process triggered by the PDCCH, that is, the random access process triggered by the PDCCH is performed between the terminal device and the TRP targeted by the random access process triggered by the PDCCH. On the other hand, the TCI state adopted by the PDCCH is associated with a TAG.

[0197] The terminal device determines whether the TAG indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH. If they are the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered by the same TRP, and the terminal device sends a random access request based on the path loss corresponding to the first path loss resource. If they are not the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered across TRPs, that is, the terminal device sends a random access request based on the path loss corresponding to the second path loss resource. It can be seen that the terminal device determines the TRP targeted by the random access process triggered by the PDCCH in an implicit manner (by comparing the TAG), thereby facilitating the terminal device to determine the appropriate path loss and send a random access request based on the path loss. Thereby, a TRP-level random access process is realized.

[0198] Implementation 2: The first field indicates whether the TAG corresponding to the random access procedure triggered by the PDCCH is the same as the TAG associated with the TCI state used by the PDCCH. If they are the same, a random access request is sent based on the path loss corresponding to the first path loss resource; if they are different, a random access request is sent based on the path loss corresponding to the second path loss resource.

[0199] If they are the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered by the same TRP, so the terminal device can send a random access request based on the path loss corresponding to the first path loss resource. If they are not the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered across TRPs, so the terminal device can send a random access request based on the path loss corresponding to the second path loss resource.

[0200] Implementation 3: The first field is used to indicate the control channel group identifier (CORESETPoolIndex). If the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, a random access request is sent based on the path loss corresponding to the first path loss resource. If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, a random access request is sent based on the path loss corresponding to the second path loss resource.

[0201] Specifically, the first field is used to indicate a control channel group identifier, which is the control channel group identifier corresponding to the random access process triggered by the PDCCH. The control channel group identifier corresponding to the random access process triggered by the PDCCH can be understood as the control channel group identifier corresponding to the TRP targeted by the random access process triggered by the PDCCH. On the other hand, the PDCCH corresponds to a control channel group identifier. In the multi-TRP transmission mode, each TRP corresponds to a control channel group identifier, and different TRPs correspond to different control channel group identifiers.

[0202] The terminal device determines whether the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH. If they are the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered by the same TRP, and the terminal device sends a random access request based on the path loss corresponding to the first path loss resource. If they are not the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered across TRPs, that is, the terminal device sends a random access request based on the path loss corresponding to the second path loss resource. It can be seen that the terminal device determines the TRP targeted by the random access process triggered by the PDCCH in an implicit manner (by comparing the control channel group identifier), thereby facilitating the terminal device to determine the appropriate path loss and send a random access request based on the path loss. Thereby, a TRP-level random access process is realized.

[0203] Implementation 4: The first field is used to indicate whether the control channel group identifier corresponding to the random access procedure triggered by the PDCCH is the same as the control channel group identifier corresponding to the PDCCH. If they are the same, a random access request is sent based on the path loss corresponding to the first path loss resource; if they are different, a random access request is sent based on the path loss corresponding to the second path loss resource.

[0204] If they are the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered by the same TRP, so the terminal device can send a random access request based on the path loss corresponding to the first path loss resource. If they are not the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered across TRPs, so the terminal device can send a random access request based on the path loss corresponding to the second path loss resource.

[0205] Implementation 5: The first field is used to indicate whether the random access procedure is a first-type random access procedure or a second-type random access procedure. If the random access procedure is a first-type random access procedure, a random access request is sent based on the pathloss corresponding to the first pathloss resource; if the random access procedure is a second-type random access procedure, a random access request is sent based on the pathloss corresponding to the second pathloss resource. In other words, if the random access procedure is a first-type random access procedure, the terminal device can determine that the PDCCH-triggered random access procedure is a same-TRP random access procedure and send a random access request based on the pathloss corresponding to the first pathloss resource. If the random access procedure is a second-type random access procedure, the terminal device can determine that the PDCCH-triggered random access procedure is a cross-TRP random access procedure and send a random access request based on the pathloss corresponding to the second pathloss resource. Thus, the terminal device explicitly determines the TRP targeted by the PDCCH-triggered random access procedure (the first field in the PDCCH), thereby facilitating the terminal device's determination of the appropriate pathloss and sending a random access request based on that pathloss. This implements a TRP-level random access procedure.

[0206] The following introduces several possible definitions of the first type of random access process. This application is still applicable to other definitions, and this application does not limit them specifically.

[0207] Mode 1: The first type of random access procedure refers to a random access procedure in which the TRP corresponding to the first type of random access procedure is the same as the TRP for transmitting the PDCCH. In other words, the TRP corresponding to the first type of random access procedure is the same as the TRP for transmitting the PDCCH; or in other words, if the TRP corresponding to the random access procedure is the same as the TRP for transmitting the PDCCH, then the random access procedure is a first type of random access procedure.

[0208] Mode 2: The first type of random access procedure refers to a random access procedure in which the TAG corresponding to the first type of random access procedure is the same as the TAG associated with the TCI state used by the PDCCH. In other words, the TAG corresponding to the first type of random access procedure is the same as the TAG associated with the TCI state used by the PDCCH; or in other words, if the TAG corresponding to the random access procedure is the same as the TAG associated with the TCI state used by the PDCCH, then the random access procedure is a first type of random access procedure.

[0209] Mode 3: A first type of random access procedure refers to a random access procedure in which the control channel group identifier corresponding to the first type of random access procedure is the same as the control channel group identifier corresponding to the PDCCH. In other words, if the control channel group identifier corresponding to the first type of random access procedure is the same as the control channel group identifier corresponding to the PDCCH; in other words, if the control channel group identifier corresponding to the random access procedure is the same as the control channel group identifier corresponding to the PDCCH, then the random access procedure is a first type of random access procedure.

[0210] Several possible definitions of the second type of random access process are introduced below. This application is still applicable to other definitions, and this application does not make any specific limitations.

[0211] Method 1: The second type of random access procedure refers to a random access procedure in which the TRP corresponding to the second type of random access procedure is different from the TRP of the transmitted PDCCH. In other words, the TAG corresponding to the second type of random access procedure is the same as the TRP of the transmitted PDCCH; or in other words, if the TRP corresponding to the random access procedure is different from the TRP of the transmitted PDCCH, then the random access procedure is a second type of random access procedure.

[0212] Mode 2: The second type of random access procedure refers to a random access procedure in which the TAG corresponding to the first type of random access procedure is different from the TAG associated with the TCI state used by the PDCCH. In other words, the TAG corresponding to the second type of random access procedure is different from the TAG associated with the TCI state used by the PDCCH; in other words, if the TAG corresponding to the random access procedure is different from the TAG associated with the TCI state used by the PDCCH, then the random access procedure is a second type of random access procedure.

[0213] Mode 3: The second type of random access procedure refers to a random access procedure in which the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH. In other words, the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH; in other words, if the control channel group identifier corresponding to the random access procedure is different from the control channel group identifier corresponding to the PDCCH, then the random access procedure is a second type of random access procedure.

[0214] Implementation method 6: The first field is used to indicate whether to send a random access request based on the path loss corresponding to the first path loss resource or to indicate whether to send a random access request based on the path loss corresponding to the second path loss resource. This allows the terminal device to send a random access request based on the path loss corresponding to the path loss resource indicated by the first field. As can be seen, the terminal device determines the TRP targeted by the random access procedure triggered by the PDCCH through an explicit method (the first field in the PDCCH), thereby facilitating the terminal device to determine the appropriate path loss and send a random access request based on that path loss. This implements a TRP-level random access procedure.

[0215] Implementation 7: The first field is used to indicate an SSB resource. If the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, a random access request is sent based on the path loss corresponding to the first path loss resource. Alternatively, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state used by the PDCCH, a random access request is sent based on the path loss corresponding to the second path loss resource.

[0216] Specifically, the first field is used to indicate the SSB resource, and the SSB resource is associated with a TAG. Specifically, the network device can configure the correspondence between the SSB resource and the TAG through RRC signaling. On the other hand, the TCI state adopted by the PDCCH is associated with a TAG. Since the TAG corresponds to the TRP, that is, in the multi-TRP transmission mode, each TRP corresponds to a TAG, and different TRPs correspond to different TAGs. Therefore, the network device can indicate the TRP targeted by the random access process triggered by the PDCCH through the TAG associated with the SSB resource indicated by the first field. That is, the TAG corresponding to the random access process triggered by the PDCCH can be understood as the TAG corresponding to the TRP targeted by the random access process triggered by the PDCCH, that is, the random access process triggered by the PDCCH is performed between the terminal device and the TRP targeted by the random access process triggered by the PDCCH.

[0217] The terminal device determines whether the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH. If they are the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered by the same TRP, and the terminal device sends a random access request based on the path loss corresponding to the first path loss resource. If they are not the same, the terminal device can determine that the random access process triggered by the PDCCH is a random access process triggered across TRPs, that is, the terminal device sends a random access request based on the path loss corresponding to the second path loss resource. It can be seen that the terminal device determines the TRP targeted by the random access process triggered by the PDCCH in an implicit manner (by comparing the TAG), thereby facilitating the terminal device to determine the appropriate path loss and send a random access request based on the path loss. Thereby, a TRP-level random access process is realized.

[0218] Optionally, when a first condition is met, the PDCCH includes the first information. The first condition includes one or more of the following:

[0219] 1. Two TAGs are configured in the serving cell corresponding to the PDCCH;

[0220] In the multi-TRP transmission mode of the same cell, the service cell corresponding to the PDCCH contains two TRPs, each TRP corresponds to a TAG, and different TRPs correspond to different TAGs. The TAG corresponding to each TRP is used to manage the TA value corresponding to the TRP. The two TAGs corresponding to the two TRPs can be understood as the two TAGs configured in the service cell corresponding to the PDCCH.

[0221] 2. Two control channel groups are configured in the serving cell corresponding to the PDCCH; or,

[0222] In the multi-TRP transmission mode of the same cell, the service cell corresponding to the PDCCH contains two TRPs, each TRP corresponds to a control channel group, and different TRPs correspond to different control channel groups. The two control channel groups corresponding to the two TRPs can be understood as the two control channel groups configured in the service cell corresponding to the PDCCH.

[0223] 3. There is no associated supplementary cell configured in the serving cell corresponding to the PDCCH.

[0224] In the multi-TRP transmission mode of the same cell, the service cell corresponding to the PDCCH contains two TRPs, and the service cell is not configured with an associated supplementary cell.

[0225] In other words, when the first condition is met, the network device sends a PDCCH to the terminal device, where the PDCCH includes the first information. That is, in the multi-TRP transmission mode of the same cell, the terminal device can use any one of the above implementation methods 1 to 7 to determine the path loss used to send the random access request.

[0226] Some possible implementations of the first condition are shown below. In one possible implementation, the first condition includes that two TAGs are configured in the service cell corresponding to the PDCCH, and no associated supplementary cell is configured in the service cell corresponding to the PDCCH. In another possible implementation, two control channel groups are configured in the service cell corresponding to the PDCCH, and no associated supplementary cell is configured in the service cell corresponding to the PDCCH. In yet another possible implementation, the first condition includes: two TAGs are configured in the service cell corresponding to the PDCCH, two control channel groups are configured in the service cell corresponding to the PDCCH, and no associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0227] Optionally, when the first condition is met, the terminal device determines the path loss used for sending the random access request through the above-mentioned implementation method 5.

[0228] Implementation method 8: In the multi-TRP transmission mode of the same cell and the multi-TRP transmission mode across cells, the meaning indicated by the first field is different. That is to say, in the multi-TRP transmission mode of the same cell and the multi-TRP transmission mode across cells, the first field exists in the PDCCH. When the second condition is met, any one of the implementation methods 1 to 6 above can be used to parse the first field. For example, the first field is used to indicate the TAG, or the first field is used to indicate whether the TAG corresponding to the random access process is the same as the TAG corresponding to the TCI state adopted by the PDCCH, or the first field is used to indicate the control channel group identifier, or the first field is used to indicate whether the control channel group identifier corresponding to the random access process is the same as the control channel group identifier corresponding to the PDCCH, or the first field is used to indicate whether the random access process is a first type random access process or a second type random access process, or the first field is used to indicate whether a random access request is sent according to the path loss corresponding to the first path loss resource or to indicate whether a random access request is sent according to the path loss corresponding to the second path loss resource. The second condition includes one or more of the following: two TAGs are configured in the serving cell corresponding to the PDCCH; two control channel groups are configured in the serving cell corresponding to the PDCCH; or no associated supplementary cell is configured in the serving cell corresponding to the PDCCH. In other words, in the case of multiple TRP transmission modes in the same cell, the first field can be parsed using the aforementioned implementations 1 to 6. For details, please refer to the relevant descriptions in the aforementioned implementations 1 to 6 and will not be repeated here.

[0229] The following introduces some possible implementations of the second condition. In one possible implementation, the second condition includes: two TAGs are configured in the service cell corresponding to the PDCCH, and no associated supplementary cell is configured in the service cell corresponding to the PDCCH. In another possible implementation, two control channel groups are configured in the service cell corresponding to the PDCCH, and no associated supplementary cell is configured in the service cell corresponding to the PDCCH. In yet another possible implementation, two TAGs are configured in the service cell corresponding to the PDCCH, two control channel groups are configured in the service cell corresponding to the PDCCH, and no associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0230] When the third condition is met, the first field is used to indicate that the cell corresponding to the random access procedure is the serving cell corresponding to the PDCCH, or to indicate that the cell corresponding to the random access procedure is an activated supplementary cell associated with the serving cell.

[0231] The third condition includes at least one of the following:

[0232] 1. Two TAGs are configured in the serving cell corresponding to the PDCCH;

[0233] In the multi-TRP transmission mode across cells, the service cell corresponding to the PDCCH corresponds to one TRP, and the activated supplementary cell associated with the service cell corresponds to another TRP. Each TRP corresponds to a TAG, and different TRPs correspond to different TAGs. The TAG corresponding to each TRP is used to manage the TA value corresponding to the TRP. The two TAGs corresponding to the two TRPs can be understood as the two TAGs configured in the service cell corresponding to the PDCCH.

[0234] 2. Two control channel groups are configured in the serving cell corresponding to the PDCCH; or,

[0235] In the multi-TRP transmission mode across cells, the serving cell corresponding to the PDCCH corresponds to one TRP, and the activated supplementary cell associated with the serving cell corresponds to another TRP. Each TRP corresponds to a control channel group, and different TRPs correspond to different control channel groups. The two control channel groups corresponding to the two TRPs can be understood as the two control channel groups configured in the serving cell corresponding to the PDCCH.

[0236] 3. The serving cell corresponding to the PDCCH is configured with an associated supplementary cell.

[0237] In the multi-TRP transmission mode across cells, the service cell corresponding to the PDCCH is configured with an associated supplementary cell, wherein the service cell corresponds to one TRP, and the activated supplementary cell associated with the service cell corresponds to another TRP.

[0238] The following introduces some possible implementations of the third condition. In one possible implementation, the third condition includes: two TAGs are configured in the service cell corresponding to the PDCCH, and an associated supplementary cell is configured in the service cell corresponding to the PDCCH. In another possible implementation, the third condition includes: two control channel groups are configured in the service cell corresponding to the PDCCH, and an associated supplementary cell is configured in the service cell corresponding to the PDCCH. In yet another possible implementation, two TAGs are configured in the service cell corresponding to the PDCCH, two control channel groups are configured in the service cell corresponding to the PDCCH, and an associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0239] That is, in the cross-cell multi-TRP transmission mode, the first field is used to indicate that the cell corresponding to the random access process is the serving cell corresponding to the PDCCH, or to indicate that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell. The following describes the specific implementation process of the terminal device determining the path loss used to send the random access request.

[0240] If the PDCCH is sent through the serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access procedure is the serving cell corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the PDCCH is sent through the serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access procedure is an activated supplementary cell associated with the serving cell corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access procedure is the serving cell corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access procedure is the serving cell corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource.

[0241] Or, in other words, if the TAG associated with the TCI state used by the PDCCH is the same as the TAG corresponding to the cell indicated by the first field in the PDCCH, a random access request is sent based on the path loss corresponding to the first path loss resource; if the TAG associated with the TCI state used by the PDCCH is different from the TAG corresponding to the cell indicated by the first field in the PDCCH, a random access request is sent based on the path loss corresponding to the second path loss resource. The TAG corresponding to the cell indicated by the first field in the PDCCH can be determined by the TAG associated with the TCI state used by the cell. For example, the TCI state used by the supplementary cell in the activated state associated with the serving cell corresponding to the PDCCH includes the identifier of the supplementary cell. The terminal device can use the identifier to determine which TCI states are the TCI states used by the supplementary cell in the activated state associated with the serving cell corresponding to the PDCCH, and then further determine the TAGs associated with these TCI states, thereby determining the TAG corresponding to the supplementary cell in the activated state associated with the serving cell. The TCI state used by the serving cell does not include the identifier of the supplementary cell. The terminal device determines these TCI states that do not include the identifier of the supplementary cell, and then determines the TAG associated with these TCI states to determine the TAG corresponding to the serving cell. The TAG corresponding to the cell indicated by the PDCCH can also be determined by specific rules. For example, it is stipulated that the serving cell corresponding to the PDCCH corresponds to the first TAG in the serving cell, and the supplementary cell in the activated state associated with the serving cell corresponding to the PDCCH corresponds to the second TAG in the serving cell.

[0242] In implementation 8, optionally, when the fourth condition is met, the PDCCH includes the first field; wherein the fourth condition includes one or more of the following: two TAGs are configured in the serving cell corresponding to the PDCCH; or two control channel groups are configured in the serving cell corresponding to the PDCCH. That is, when the fourth condition is met, the network device sends a PDCCH to the terminal device, and the PDCCH includes the first field. In other words, when the fourth condition is met, the terminal device adopts the multi-TRP transmission mode.

[0243] Furthermore, when the second condition is met, the terminal device adopts the TRP transmission mode of the same cell, and when the third condition is met, the terminal device adopts the multi-TRP transmission mode across cells. Some preferred solutions of the second condition, the third condition and the fourth condition are shown below.

[0244] When the fourth condition is met, the PDCCH includes the first field, and on this basis, when the second condition is met, the meaning indicated by the first field is the meaning indicated in any one of the implementation methods shown in implementation methods 1 to 6 above. In one possible implementation method, the fourth condition includes: two TAGs are configured in the service cell corresponding to the PDCCH, and the second condition includes that no associated supplementary cell is configured in the service cell corresponding to the PDCCH. In another possible implementation method, the fourth condition includes: two control channel groups are configured in the service cell corresponding to the PDCCH, and the second condition includes that no associated supplementary cell is configured in the service cell corresponding to the PDCCH. In yet another possible implementation method, the fourth condition includes: two TAGs are configured in the service cell corresponding to the PDCCH, two control channel groups are configured in the service cell corresponding to the PDCCH, and the second condition includes that no associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0245] Optionally, the embodiment shown in FIG6 further includes step 604 , which may be performed after step 603 .

[0246] 604. The network device sends a random access response to the terminal device. Correspondingly, the terminal device receives the random access response from the network device.

[0247] Optionally, the random access response includes a second field, where the second field is used to indicate a TAG corresponding to the TA value carried in the random access response.

[0248] Based on implementation 1 or implementation 8 of the first field in step 603, in one possible implementation, the TAG indicated by the second field is the same as the TAG indicated by the first field, thereby avoiding the situation where the TAGs corresponding to the random access process are different and achieving TAG alignment corresponding to the random access process.

[0249] Based on implementation method 2 or implementation method 8 of the first field in the above step 603, in one possible implementation method, according to the first field, if the first field indicates that the TAG corresponding to the random access process triggered by the PDCCH is the same as the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the first field indicates that the TAG corresponding to the random access process triggered by the PDCCH is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0250] Based on implementation method 3 or implementation method 8 of the first field in the above step 603, in one possible implementation method, if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0251] If the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, then it can be understood that the TRP corresponding to the random access process triggered by the PDCCH is the same as the TRP for sending the random access request, that is, the multi-TRP transmission mode of the same cell. Therefore, the TAG indicated by the second field should be the same as the TAG associated with the TCI state adopted by the PDCCH, thereby avoiding the situation where the TAGs corresponding to the same TRP are different. If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, then it can be understood that the TRP corresponding to the random access process triggered by the PDCCH is not the same as the TRP for sending the random access request, that is, the multi-TRP transmission mode across cells. The TAG indicated by the second field should be different from the TAG associated with the TCI state adopted by the PDCCH. This achieves different TRPs corresponding to different TAGs.

[0252] Based on implementation method 4 or implementation method 8 of the first field in the above step 603, in one possible implementation method, if the first field indicates that the control channel group identifier corresponding to the random access process triggered by the PDCCH is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the first field indicates that the control channel group identifier corresponding to the random access process triggered by the PDCCH is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0253] Based on implementation method 5 or implementation method 8 of the first field in step 603 above, in one possible implementation method, if the random access procedure is a first type of random access procedure, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the random access procedure is a second type of random access procedure, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0254] If the random access process is the first type of random access process, that is, the multi-TRP transmission mode in the same cell, the TAG indicated by the second field should be the same as the TAG associated with the TCI state used by the PDCCH, thereby avoiding the situation where the TAGs corresponding to the same TRP are different. If the random access process is the second type of random access process, that is, the multi-TRP transmission mode across cells, the TAG indicated by the second field should be different from the TAG associated with the TCI state used by the PDCCH. This allows different TRPs to correspond to different TAGs.

[0255] Based on implementation method 6 or implementation method 8 of the first field in the above step 603, in one possible implementation method, if the first field indicates that a random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the first field indicates that a random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0256] If the first field indicates that a random access request is sent based on the path loss corresponding to the first path loss resource, that is, in a multi-TRP transmission mode within the same cell, the terminal device can send a random access request based on the path loss corresponding to the first path loss resource, and therefore the TAG indicated by the second field should be the same as the TAG associated with the TCI state adopted by the PDCCH, thereby avoiding the situation where the TAGs corresponding to the same TRP are different. If the first field indicates that a random access request is sent based on the path loss corresponding to the second path loss resource, that is, in a multi-TRP transmission mode across cells, the terminal device can send a random access request based on the path loss corresponding to the second path loss resource, and therefore the TAG indicated by the second field should be different from the TAG associated with the TCI state adopted by the PDCCH.

[0257] Based on implementation method 7 or implementation method 8 of the first field in the above step 603, in one possible implementation method, if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0258] If the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, that is, in the multi-TRP transmission mode of the same cell, the terminal device can send a random access request based on the path loss corresponding to the first path loss resource, so the TAG indicated by the second field should be the same as the TAG associated with the TCI state used by the PDCCH, thereby avoiding the situation where the TAGs corresponding to the same TRP are different. If the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state used by the PDCCH, that is, in the multi-TRP transmission mode across cells, the terminal device can send a random access request based on the path loss corresponding to the second path loss resource, so the TAG indicated by the second field should be different from the TAG associated with the TCI state used by the PDCCH.

[0259] Optionally, the terminal device determines the TA value corresponding to the TAG associated with the random access process according to the second field. Optionally, the terminal device may determine the TAG associated with the random access process through the following two possible implementations.

[0260] Method 1: The random access request includes a first field, which is used to indicate a TAG. The terminal device determines that the TAG indicated by the first field is the TAG associated with the random access process. This method can be used for multiple TRP transmission modes in the same cell. For example, when the above-mentioned second condition is met, the terminal device uses this method to determine the TAG associated with the random access process.

[0261] Method 2: The third field in the PDCCH is used to indicate that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell corresponding to the PDCCH. The random access response message includes a TA value; if the cell corresponding to the random access process is the service cell, the TA value is the TA value corresponding to the first TAG of the service cell corresponding to the PDCCH; or, if the cell corresponding to the random access process is an activated supplementary cell associated with the service cell, the TA value is the TA value corresponding to the second TAG of the service cell corresponding to the PDCCH. This method can be used for multi-TRP transmission mode across cells. For example, when the above-mentioned third condition is met, the terminal device uses this method to determine the TAG associated with the random access process.

[0262] The serving cell corresponding to the PDCCH is configured with two tags. Optionally, the first tag of the serving cell corresponding to the PDCCH may be the first tag configured earlier in the two tags, and the second tag of the serving cell corresponding to the PDCCH may be the second tag configured later in the two tags. Alternatively, the first tag of the serving cell corresponding to the PDCCH may be the tag with the smaller index of the two tags, and the second tag of the serving cell corresponding to the PDCCH may be the tag with the larger index of the two tags.

[0263] In an embodiment of the present application, a terminal device receives a PDCCH from a network device, and the PDCCH is used to trigger a random access process between the terminal device and the network device. The terminal device determines the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource based on the first information in the PDCCH. The first path loss resource is the QCL resource in the TCI state adopted by the PDCCH, and the second path loss resource is the SSB resource indicated in the PDCCH. The terminal device sends a random access request to the network device based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource. This enables the terminal device to select an appropriate path loss to send a random access request, thereby enabling the acquisition of the TA value in the multi-TRP transmission mode.

[0264] The communication device provided in the embodiments of the present application is described below.

[0265] FIG7 is a schematic diagram of a communication device according to an embodiment of the present application. Referring to FIG7 , a communication device 700 can be used to execute the process executed by the terminal device in the embodiment shown in FIG6 . For details, please refer to the relevant description of the above method embodiment.

[0266] The communication device 700 includes a transceiver module 701 and a processing module 702 .

[0267] The processing module 702 is used to process data. The transceiver module 701 can implement corresponding communication functions. The transceiver module 701 can also be called a communication interface or a communication module.

[0268] Optionally, the communication device 700 may further include a storage module, which may be used to store instructions and / or data. The processing module 702 may read the instructions and / or data in the storage module to enable the communication device to implement the aforementioned method embodiment.

[0269] The communication device 700 can be used to perform the actions performed by the terminal device in the above method embodiments. The communication device 700 can be a terminal device or a component that can be configured in a terminal device. The processing module 702 is used to perform the processing-related operations on the terminal device side in the above method embodiments. The transceiver module 701 is used to perform the reception-related operations on the terminal device side in the above method embodiments. For example, the communication device 700 is used to perform the following scheme:

[0270] The transceiver module 701 is used to receive a PDCCH from a network device, where the PDCCH is used to trigger a random access process between the communication device 700 and the network device;

[0271] A processing module 702 is configured to determine, based on first information in a PDCCH, a path loss corresponding to a first path loss resource or a path loss corresponding to a second path loss resource, where the first path loss resource is a QCL resource in a TCI state used by the PDCCH, and the second path loss resource is an SSB resource indicated in the PDCCH;

[0272] The transceiver module 701 is further configured to send a random access request to the network device according to the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource.

[0273] In a possible implementation manner, the first information is the first field in the PDCCH.

[0274] In another possible implementation, the first field is used to indicate the TAG; if the TAG indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the TAG indicated by the first field is different from the TAG associated with the TCI state used by the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0275] In another possible implementation, the transceiver module 701 is further used to: receive a random access response from the network device, the random access response includes a second field, the second field is used to indicate the TAG corresponding to the TA value carried in the random access response, and the TAG indicated by the second field is the same as the TAG indicated by the first field.

[0276] In another possible implementation, the first field is used to indicate a control channel group identifier; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0277] In another possible implementation, the transceiver module 701 is also used to: receive a random access response from a network device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response message; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0278] In another possible implementation, the first field is used to indicate whether the random access process is a first type of random access process or a second type of random access process; if the random access process is a first type of random access process, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the random access process is a second type of random access process, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0279] In another possible implementation, the first type of random access procedure includes: a random access procedure in which the TRP corresponding to the first type of random access procedure is the same as the TRP for sending the PDCCH; in other words, the TRP corresponding to the first type of random access procedure is the same as the TRP for sending the PDCCH, or if the TRP corresponding to the random access procedure is the same as the TRP for sending the PDCCH, then the random access procedure is the first type of random access procedure; or,

[0280] A random access procedure of the first type has the same TAG as the TAG associated with the TCI state used by the PDCCH; in other words, the TAG corresponding to the first type of random access procedure is the same as the TAG associated with the TCI state used by the PDCCH; or if the TAG corresponding to the random access procedure is the same as the TAG associated with the TCI state used by the PDCCH, then the random access procedure is a first type of random access procedure; or

[0281] A random access procedure of the first type is a random access procedure in which the control channel group identifier corresponding to the PDCCH is the same as the control channel group identifier corresponding to the first type of random access procedure. In other words, the control channel group identifier corresponding to the first type of random access procedure is the same as the control channel group identifier corresponding to the PDCCH; or if the control channel group identifier corresponding to the random access procedure is the same as the control channel group identifier corresponding to the PDCCH, then the random access procedure is a first type of random access procedure.

[0282] In another possible implementation, the second type of random access procedure includes: a random access procedure in which the TRP corresponding to the second type of random access procedure is different from the TRP for sending the PDCCH; in other words, the TRP corresponding to the second type of random access procedure is the same as the TRP for sending the PDCCH, or if the TRP corresponding to the random access procedure is different from the TRP for sending the PDCCH, then the random access procedure is the second type of random access procedure; or,

[0283] A random access procedure of the second type in which the TAG corresponding to the random access procedure is different from the TAG associated with the TCI state used by the PDCCH; in other words, the TAG corresponding to the second type of random access procedure is the same as the TAG associated with the TCI state used by the PDCCH, or if the TAG corresponding to the random access procedure is different from the TAG associated with the TCI state used by the PDCCH, then the random access procedure is a random access procedure of the second type; or

[0284] A random access procedure of the second type is a random access procedure in which the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH. In other words, if the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH, or if the control channel group identifier corresponding to the random access procedure is different from the control channel group identifier corresponding to the PDCCH, then the random access procedure is a random access procedure of the second type.

[0285] In another possible implementation, the transceiver module 701 is also used to: receive a random access response from a network device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the random access process is a first type of random access process, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the random access process is a second type of random access process, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0286] In another possible implementation, the first field is used to indicate whether to send a random access request according to the path loss corresponding to the first path loss resource or to indicate whether to send a random access request according to the path loss corresponding to the second path loss resource.

[0287] In another possible implementation, the transceiver module 701 is also used to: receive a random access response from a network device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the first field indicates that a random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the first field indicates that a random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0288] In another possible implementation, the first field is used to indicate the SSB resource; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0289] In another possible implementation, the transceiver module 701 is also used to: receive a random access response from a network device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0290] In another possible implementation, when the first condition is met, the PDCCH includes first information; wherein the first condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or, no associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0291] In another possible implementation, when the second condition is met, the first field is used to indicate the TAG, or the first field is used to indicate whether the TAG corresponding to the random access process is the same as the TAG corresponding to the TCI state adopted by the PDCCH, or the first field is used to indicate the control channel group identifier, or the first field is used to indicate whether the control channel group identifier corresponding to the random access process is the same as the control channel group identifier corresponding to the PDCCH, or the first field is used to indicate that the random access process is a first type of random access process or a second type of random access process, or the first field is used to indicate whether a random access request is sent according to the path loss corresponding to the first path loss resource or whether a random access request is sent according to the path loss corresponding to the second path loss resource; wherein the second condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or no associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0292] In another possible implementation, when the third condition is met, the first field is used to indicate that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell; wherein the third condition includes at least one of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or, an associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0293] In another possible implementation, if the PDCCH is sent through the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the service cell, then the random access request is sent according to the path loss corresponding to the first path loss resource; or, if the PDCCH is sent through the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell, then the random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, then the random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell corresponding to the PDCCH, then the random access request is sent according to the path loss corresponding to the first path loss resource.

[0294] In another possible implementation, when the fourth condition is met, the PDCCH includes the first field; wherein the fourth condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; or, two control channel groups are configured in the service cell corresponding to the PDCCH.

[0295] In another possible implementation, the third field in the PDCCH is used to indicate that the cell corresponding to the random access process is the serving cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell; the random access response message includes a TA value; if the cell corresponding to the random access process is the serving cell, the TA value is the TA value corresponding to the first TAG of the serving cell; or, if the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell, the TA value is the TA value corresponding to the second TAG of the serving cell.

[0296] Optionally, the transceiver module 701 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the above method embodiment. The receiving module is used to perform the receiving operation in the above method embodiment.

[0297] It should be noted that the communication device 700 may include a sending module but not a receiving module. Alternatively, the communication device 700 may include a receiving module but not a sending module. The specific implementation depends on whether the above solution executed by the communication device 700 includes a sending action and a receiving action.

[0298] Optionally, the communication device 700 is configured to execute the actions executed by the terminal device in the embodiment shown in Figure 6. For details, please refer to the relevant introduction of the embodiment shown in Figure 6, which will not be elaborated here.

[0299] It should be understood that the specific process of each module executing the above corresponding process has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0300] The processing module 702 in the above embodiment can be implemented by at least one processor or processor-related circuits. The transceiver module 701 can be implemented by a transceiver or transceiver-related circuits. The transceiver module 701 can also be called a communication module or communication interface. The storage module can be implemented by at least one memory.

[0301] FIG8 is a schematic diagram of a communication device according to an embodiment of the present application. Referring to FIG8 , the communication device 800 can be used to execute the process executed by the network device in the embodiment shown in FIG6 . For details, please refer to the relevant description of the above method embodiment.

[0302] The communication device 800 includes a transceiver module 801. Optionally, the communication device 800 further includes a processing module 802.

[0303] The processing module 802 is used to perform data processing. The transceiver module 801 can implement corresponding communication functions. The transceiver module 801 can also be called a communication interface or a communication module.

[0304] Optionally, the communication device 800 may further include a storage module, which may be used to store instructions and / or data. The processing module 802 may read the instructions and / or data in the storage module to enable the communication device to implement the aforementioned method embodiment.

[0305] The communication device 800 can be used to perform the actions performed by the network device in the above method embodiments. The communication device 800 can be a network device or a component that can be configured on a network device. The processing module 802 is used to perform the processing-related operations on the network device side in the above method embodiments. The transceiver module 801 is used to perform the reception-related operations on the network device side in the above method embodiments. For example, the communication device 800 is used to perform the following scheme:

[0306] The transceiver module 801 is used to send a PDCCH to a terminal device, where the PDCCH is used to trigger a random access process between the terminal device and the communication device 800; and receive a random access request from the terminal device, where the random access request is sent based on the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource determined based on the first information in the PDCCH. The first path loss resource is the QCL resource in the TCI state adopted by the PDCCH, and the second path loss resource is the SSB resource indicated in the PDCCH.

[0307] In a possible implementation manner, the first information is the first field in the PDCCH.

[0308] In another possible implementation, the first field is used to indicate the TAG; if the TAG indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the TAG indicated by the first field is different from the TAG associated with the TCI state used by the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0309] In another possible implementation, the transceiver module 801 is also used to: send a random access response to the terminal device, the random access response includes a second field, the second field is used to indicate the TAG corresponding to the TA value carried in the random access response, and the TAG indicated by the second field is the same as the TAG indicated by the first field.

[0310] In another possible implementation, the first field is used to indicate a control channel group identifier; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0311] In another possible implementation, the transceiver module 801 is also used to: send a random access response to the terminal device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response message; if the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0312] In another possible implementation, the first field is used to indicate whether the random access process is a first type of random access process or a second type of random access process; if the random access process is a first type of random access process, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the random access process is a second type of random access process, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0313] In another possible implementation, the first type of random access procedure includes: a random access procedure in which the TRP corresponding to the first type of random access procedure is the same as the TRP for sending the PDCCH; in other words, the TRP corresponding to the first type of random access procedure is the same as the TRP for sending the PDCCH, or if the TRP corresponding to the random access procedure is the same as the TRP for sending the PDCCH, then the random access procedure is the first type of random access procedure. Or,

[0314] The TAG corresponding to the first type of random access procedure is the same as the TAG associated with the TCI state used by the PDCCH; in other words, the TAG corresponding to the first type of random access procedure is the same as the TAG associated with the TCI state used by the PDCCH; or if the TAG corresponding to the random access procedure is the same as the TAG associated with the TCI state used by the PDCCH, then the random access procedure is the first type of random access procedure. Or,

[0315] A random access procedure of the first type is a random access procedure in which the control channel group identifier corresponding to the PDCCH is the same as the control channel group identifier corresponding to the first type of random access procedure. In other words, the control channel group identifier corresponding to the first type of random access procedure is the same as the control channel group identifier corresponding to the PDCCH; or if the control channel group identifier corresponding to the random access procedure is the same as the control channel group identifier corresponding to the PDCCH, then the random access procedure is a first type of random access procedure.

[0316] In another possible implementation, the second type of random access process includes: a random access process in which the TRP corresponding to the second type of random access process is different from the TRP for sending the PDCCH; in other words, the TRP corresponding to the second type of random access process is the same as the TRP for sending the PDCCH, or if the TRP corresponding to the random access process is different from the TRP for sending the PDCCH, then the random access process is a second type of random access process. Or,

[0317] The TAG corresponding to the second type of random access procedure is different from the TAG associated with the TCI state used by the PDCCH; in other words, the TAG corresponding to the second type of random access procedure is the same as the TAG associated with the TCI state used by the PDCCH, or if the TAG corresponding to the random access procedure is different from the TAG associated with the TCI state used by the PDCCH, then the random access procedure is the second type of random access procedure. Or,

[0318] A random access procedure of the second type is a random access procedure in which the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH. In other words, if the control channel group identifier corresponding to the second type of random access procedure is different from the control channel group identifier corresponding to the PDCCH, or if the control channel group identifier corresponding to the random access procedure is different from the control channel group identifier corresponding to the PDCCH, then the random access procedure is a random access procedure of the second type.

[0319] In another possible implementation, the transceiver module 801 is also used to: receive a random access response from a terminal device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the random access process is a first type of random access process, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the random access process is a second type of random access process, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0320] In another possible implementation, the first field is used to indicate whether to send a random access request according to the path loss corresponding to the first path loss resource or to indicate whether to send a random access request according to the path loss corresponding to the second path loss resource.

[0321] In another possible implementation, the transceiver module 801 is also used to: send a random access response to the terminal device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the first field indicates that a random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the first field indicates that a random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0322] In another possible implementation, the first field is used to indicate the SSB resource; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, a random access request is sent according to the path loss corresponding to the first path loss resource; or, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, a random access request is sent according to the path loss corresponding to the second path loss resource.

[0323] In another possible implementation, the transceiver module 801 is also used to: send a random access response to the terminal device, the random access response includes a second field, and the second field is used to indicate the TAG corresponding to the TA value carried in the random access response; if the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, if the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

[0324] In another possible implementation, when the first condition is met, the PDCCH includes first information; wherein the first condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or, no associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0325] In another possible implementation, when the second condition is met, the first field is used to indicate the TAG, or the first field is used to indicate whether the TAG corresponding to the random access process is the same as the TAG corresponding to the TCI state adopted by the PDCCH, or the first field is used to indicate the control channel group identifier, or the first field is used to indicate whether the control channel group identifier corresponding to the random access process is the same as the control channel group identifier corresponding to the PDCCH, or the first field is used to indicate that the random access process is a first type of random access process or a second type of random access process, or the first field is used to indicate whether a random access request is sent according to the path loss corresponding to the first path loss resource or whether a random access request is sent according to the path loss corresponding to the second path loss resource; wherein the second condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or no associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0326] In another possible implementation, when the third condition is met, the first field is used to indicate that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell; wherein the third condition includes at least one of the following: two TAGs are configured in the service cell corresponding to the PDCCH; two control channel groups are configured in the service cell corresponding to the PDCCH; or, an associated supplementary cell is configured in the service cell corresponding to the PDCCH.

[0327] In another possible implementation, if the PDCCH is sent through the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the service cell, then the random access request is sent according to the path loss corresponding to the first path loss resource; or, if the PDCCH is sent through the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell, then the random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the service cell corresponding to the PDCCH, then the random access request is sent according to the path loss corresponding to the second path loss resource; or, if the PDCCH is sent through the activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell corresponding to the PDCCH, then the random access request is sent according to the path loss corresponding to the first path loss resource.

[0328] In another possible implementation, when the fourth condition is met, the PDCCH includes the first field; wherein the fourth condition includes one or more of the following: two TAGs are configured in the service cell corresponding to the PDCCH; or, two control channel groups are configured in the service cell corresponding to the PDCCH.

[0329] In another possible implementation, the third field in the PDCCH is used to indicate that the cell corresponding to the random access process is the serving cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell; the random access response message includes a TA value; if the cell corresponding to the random access process is the serving cell, the TA value is the TA value corresponding to the first TAG of the serving cell; or, if the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell, the TA value is the TA value corresponding to the second TAG of the serving cell.

[0330] Optionally, the transceiver module 801 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the above method embodiment. The receiving module is used to perform the receiving operation in the above method embodiment.

[0331] It should be noted that the communication device 800 may include a sending module but not a receiving module. Alternatively, the communication device 800 may include a receiving module but not a sending module. The specific implementation depends on whether the above solution executed by the communication device 800 includes a sending action and a receiving action.

[0332] Optionally, the communication device 800 is used to execute the actions executed by the network device in the embodiment shown in Figure 6. For details, please refer to the relevant introduction of the embodiment shown in Figure 6, which will not be expanded here.

[0333] It should be understood that the specific process of each module executing the above corresponding process has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0334] The processing module 802 in the above embodiment can be implemented by at least one processor or processor-related circuits. The transceiver module 801 can be implemented by a transceiver or transceiver-related circuits. The transceiver module 801 can also be referred to as a communication module or communication interface. The storage module can be implemented by at least one memory.

[0335] The present application further provides a communication device 900, which may be a terminal device, a processor in the terminal device, or a chip. The communication device 900 may be used to execute the operations executed by the terminal device in the above method embodiment.

[0336] When the communication device 900 is a terminal device, FIG9 shows a simplified schematic diagram of the terminal device structure. As shown in FIG9, the terminal device includes a processor, a memory, and a transceiver. The memory can store computer program code, and the transceiver includes a transmitter 931, a receiver 932, a radio frequency circuit (not shown), an antenna 933, and input / output devices (not shown).

[0337] The processor is mainly used to process communication protocols and communication data; control terminal devices, execute software programs and process software program data, etc.

[0338] Memory is mainly used to store software programs and data.

[0339] Radio frequency circuits are mainly used for conversion between baseband signals and radio frequency signals and for processing radio frequency signals.

[0340] Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.

[0341] The input and output device may include a touch screen, a display screen, or a keyboard. The input and output device is mainly used to receive data input by the user and output data to the user. It should be noted that some types of terminal devices may not have input and output devices.

[0342] When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the RF circuit. The RF circuit then performs RF processing on the baseband signal and transmits the RF signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna. The RF circuit converts the RF signal into a baseband signal and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, Figure 9 shows only one memory, processor, and transceiver. In actual terminal device products, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be set independently of the processor or integrated with the processor, and this embodiment of the application does not limit this.

[0343] In the embodiment of the present application, the antenna and radio frequency circuit with transceiver functions can be regarded as the transceiver module of the terminal device, and the processor with processing function can be regarded as the processing module of the terminal device.

[0344] As shown in FIG9 , the communication device includes a processor 910, a memory 920, and a transceiver 930. The processor 910 may also be referred to as a processing unit, a processing board, a processing module, or a processing device. The transceiver 930 may also be referred to as a transceiver unit, a transceiver, or a transceiver device.

[0345] Optionally, the device used to implement the receiving function in transceiver 930 is considered a receiving module, and the device used to implement the transmitting function in transceiver 930 is considered a transmitting module. That is, transceiver 930 includes a receiver and a transmitter. A transceiver may also be sometimes referred to as a transceiver, a transceiver module, or a transceiver circuit. A receiver may also be sometimes referred to as a receiver, a receiving module, or a receiving circuit. A transmitter may also be sometimes referred to as a transmitter, a transmitting module, or a transmitting circuit.

[0346] The processor 910 is used to execute the processing actions on the terminal device side in the embodiment shown in Figure 6. The transceiver 930 is used to execute the transceiver actions on the terminal device side in the embodiment shown in Figure 6.

[0347] It should be understood that FIG9 is merely an example and not a limitation, and the terminal device including the transceiver module and the processing module may not rely on the structure shown in FIG7 or FIG9.

[0348] When the communication device 900 is a chip, the chip includes a processor, a memory, and a transceiver. The transceiver may be an input / output circuit or a communication interface. The processor may be a processing module, a microprocessor, or an integrated circuit integrated on the chip. The sending operation of the terminal device in the above method embodiment can be understood as the output of the chip, and the receiving operation of the terminal device in the above method embodiment can be understood as the input of the chip.

[0349] The present application also provides a communication device 1000, which can be a network device or a chip. The communication device 1000 can be used to perform the operations performed by the network device in the embodiment shown in FIG6 .

[0350] When the communication device 1000 is a network device, such as a base station, Figure 10 shows a simplified schematic diagram of a base station structure. The base station includes parts 1010, 1020, and 1030.

[0351] Part 1010 is mainly used for baseband processing, base station control, etc.; Part 1010 is usually the control center of the base station, which can usually be called a processor, used to control the base station to perform the processing operations on the network device side in the above method embodiment.

[0352] Part 1020 is mainly used to store computer program code and data.

[0353] Section 1030 is primarily used for receiving and transmitting RF signals and converting RF signals to baseband signals. Section 1030 can generally be referred to as a transceiver module, transceiver, transceiver circuit, or transceiver. The transceiver module in section 1030, which can also be referred to as a transceiver or transceiver, includes an antenna 1033 and a RF circuit (not shown in the figure), where the RF circuit is primarily used for RF processing. Optionally, the device used to implement the receiving function in section 1030 can be considered a receiver, and the device used to implement the transmitting function can be considered a transmitter, that is, section 1030 includes a receiver 1032 and a transmitter 1031. A receiver can also be referred to as a receiving module, a receiver, or a receiving circuit, and a transmitter can be referred to as a transmitting module, a transmitter, or a transmitting circuit.

[0354] Sections 1010 and 1020 may include one or more boards, each of which may include one or more processors and one or more memories. The processor is used to read and execute programs in the memory to implement baseband processing functions and control the base station. If multiple boards are present, the boards may be interconnected to enhance processing capabilities. As an optional implementation, multiple boards may share one or more processors, multiple boards may share one or more memories, or multiple boards may simultaneously share one or more processors.

[0355] For example, in one implementation, the transceiver module in section 1030 is used to execute the transceiver-related processes executed by the network device in the embodiment shown in Figure 6. The processor in section 1010 is used to execute the processing-related processes executed by the network device in the embodiment shown in Figure 6.

[0356] It should be understood that FIG10 is merely an example and not a limitation, and the network device including the processor, memory, and transceiver may not rely on the structure shown in FIG8 or FIG10.

[0357] When communication device 1000 is a chip, the chip includes a transceiver, memory, and a processor. The transceiver can be an input / output circuit or a communication interface; the processor can be a processor, microprocessor, or integrated circuit integrated on the chip. The network device's transmit operation in the above method embodiment can be understood as the chip's output, and the network device's receive operation in the above method embodiment can be understood as the chip's input.

[0358] An embodiment of the present application also provides a computer-readable storage medium on which computer instructions for implementing the method executed by a terminal device or a network device in the above method embodiment are stored.

[0359] For example, when the computer program is executed by a computer, the computer can implement the method performed by the terminal device or the network device in the above method embodiment.

[0360] An embodiment of the present application also provides a computer program product comprising instructions, which, when executed by a computer, enables the computer to implement the method executed by the terminal device or the network device in the above method embodiment.

[0361] The present application also provides a communication system including the terminal device and the network device described in the above embodiment. The terminal device is configured to perform some or all of the operations performed by the terminal device in the above method embodiment, and the network device is configured to perform some or all of the operations performed by the network device in the above method embodiment.

[0362] An embodiment of the present application further provides a chip device, including a processor, configured to call a computer program or computer instruction stored in the memory so that the processor executes the method provided in the embodiment shown in FIG. 6 .

[0363] In a possible implementation, the input of the chip device corresponds to the receiving operation in any one of the embodiments shown in FIG. 6 , and the output of the chip device corresponds to the sending operation in any one of the embodiments shown in FIG. 6 .

[0364] Optionally, the processor is coupled to the memory via an interface.

[0365] Optionally, the chip device further includes a memory, in which computer programs or computer instructions are stored.

[0366] The processor mentioned in any of the above may be a general-purpose central processing unit, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the method provided in any of the embodiments shown in FIG6 . The memory mentioned in any of the above may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), etc.

[0367] Those skilled in the art can clearly understand that, for the sake of convenience and brevity of description, the explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0368] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the 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 executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0369] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0370] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0371] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the part that essentially contributes to the technical solution of the present application or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0372] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A random access method, applied to a terminal device, the method comprising: Receiving a physical downlink control channel PDCCH, where the PDCCH is used to trigger a random access process between the terminal device and the network device; Determine, according to the first information in the PDCCH, a path loss corresponding to a first path loss resource or a path loss corresponding to a second path loss resource, wherein the first path loss resource is a quasi-coordinated QCL resource in a TCI state indicated by a transmission configuration adopted by the PDCCH, and the second path loss resource is a synchronization signal block SSB resource indicated in the PDCCH; The random access request is sent according to the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource.

2. A random access method, applied to a network device, comprising: Sending a downlink control channel PDCCH, where the PDCCH is used to trigger a random access process between the terminal device and the network device; A random access request is received, where the random access request is sent according to the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource determined based on the first information in the PDCCH, where the first path loss resource is a quasi-coordinated QCL resource in the TCI state indicated by the transmission configuration adopted by the PDCCH, and the second path loss resource is a synchronization signal block SSB resource indicated in the PDCCH.

3. The method according to claim 1 or 2, characterized in that: The first information is the first field in the PDCCH.

4. The method according to claim 3, characterized in that The first field is used to indicate a timing advance group TAG; If the TAG indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the TAG indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the random access request is sent according to the path loss corresponding to the second path loss resource.

5. The method according to claim 4, characterized in that The method further comprises: A random access response is received, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response, and the TAG indicated by the second field is the same as the TAG indicated by the first field.

6. The method according to claim 3, characterized in that The first field is used to indicate a control channel group identifier; If the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the random access request is sent according to the path loss corresponding to the second path loss resource.

7. The method according to claim 6, characterized in that The method further comprises: receiving a random access response, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response message; If the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH; or, If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

8. The method according to claim 3, characterized in that The first field is used to indicate that the random access procedure is a first type of random access procedure or a second type of random access procedure; If the random access procedure is a first type of random access procedure, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the random access procedure is a second type of random access procedure, the random access request is sent according to the path loss corresponding to the second path loss resource.

9. The method according to claim 8, characterized in that The first type of random access process includes: a random access process in which a transmission reception point TRP corresponding to the first type of random access process is the same as a TRP for sending the PDCCH; or A random access process in which a TAG corresponding to the first type of random access process is the same as a TAG associated with a TCI state used by the PDCCH; or A random access procedure in which the control channel group identifier corresponding to the first type of random access procedure is the same as the control channel group identifier corresponding to the PDCCH.

10. The method according to claim 8, characterized in that The second type of random access process includes: a random access process in which a transmission reception point TRP corresponding to the second type of random access process is different from a TRP for sending the PDCCH; or A random access process in which a TAG corresponding to the second type of random access process is different from a TAG associated with a TCI state adopted by the PDCCH; or A random access procedure in which a control channel group identifier corresponding to the second type of random access procedure is different from a control channel group identifier corresponding to the PDCCH.

11. The method according to any one of claims 8 to 10, characterized in that The method further comprises: receiving a random access response, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response; If the random access procedure is a first type of random access procedure, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, If the random access procedure is a second type of random access procedure, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

12. The method according to claim 3, characterized in that The first field is used to indicate that the random access request is sent according to the path loss corresponding to the first path loss resource or to indicate that the random access request is sent according to the path loss corresponding to the second path loss resource.

13. The method according to claim 12, characterized in that The method further comprises: receiving a random access response, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response; If the first field indicates that the random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH; or, If the first field indicates that the random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

14. The method according to claim 3, characterized in that The first field is used to indicate SSB resources; If the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the random access request is sent according to the path loss corresponding to the second path loss resource.

15. The method according to claim 14, characterized in that The method further comprises: receiving a random access response, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response; If the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH; or, If the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

16. The method according to any one of claims 4 to 15, characterized in that When a first condition is met, the PDCCH includes the first information; wherein the first condition includes one or more of the following: Two TAGs are configured in the serving cell corresponding to the PDCCH; Two control channel groups are configured in the serving cell corresponding to the PDCCH; or, The serving cell corresponding to the PDCCH has no associated supplementary cell.

17. The method according to claim 3, characterized in that When the second condition is met, the first field is used to indicate a TAG, or the first field is used to indicate whether the TAG corresponding to the random access process is the same as the TAG corresponding to the TCI state adopted by the PDCCH, or the first field is used to indicate a control channel group identifier, or the first field is used to indicate whether the control channel group identifier corresponding to the random access process is the same as the control channel group identifier corresponding to the PDCCH, or the first field is used to indicate that the random access process is a first type random access process or a second type random access process, or the first field is used to indicate that the random access request is sent according to the path loss corresponding to the first path loss resource or that the random access request is sent according to the path loss corresponding to the second path loss resource; wherein the second condition includes one or more of the following: Two TAGs are configured in the serving cell corresponding to the PDCCH; Two control channel groups are configured in the serving cell corresponding to the PDCCH; or, The serving cell corresponding to the PDCCH has no associated supplementary cell.

18. The method according to claim 3, characterized in that When the third condition is met, the first field is used to indicate that the cell corresponding to the random access process is the serving cell corresponding to the PDCCH, or to indicate that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell; wherein the third condition includes at least one of the following: Two TAGs are configured in the serving cell corresponding to the PDCCH; Two control channel groups are configured in the serving cell corresponding to the PDCCH; or, The serving cell corresponding to the PDCCH is configured with an associated supplementary cell.

19. The method according to claim 18, characterized in that If the PDCCH is sent through the serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the serving cell, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the PDCCH is sent through the serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell, the random access request is sent according to the path loss corresponding to the second path loss resource; or, If the PDCCH is sent through an activated supplementary cell associated with a serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the serving cell, sending the random access request according to the path loss corresponding to the second path loss resource; or, If the PDCCH is sent through an activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell, then the random access request is sent according to the path loss corresponding to the first path loss resource.

20. The method according to any one of claims 17 to 19, characterized in that When a fourth condition is met, the PDCCH includes the first field; wherein the fourth condition includes one or more of the following: Two TAGs are configured in the serving cell corresponding to the PDCCH; or, Two control channel groups are configured in the serving cell corresponding to the PDCCH.

21. The method according to any one of claims 1 to 20, characterized in that The third field in the PDCCH is used to indicate that the cell corresponding to the random access process is the serving cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell; the random access response message includes a TA value; If the cell corresponding to the random access process is the serving cell, the TA value is the TA value corresponding to the first TAG of the serving cell; or, If the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell, the TA value is a TA value corresponding to the second TAG of the serving cell.

22. A first communication device, comprising a transceiver module and a processing module; The transceiver module is used to receive a physical downlink control channel PDCCH, where the PDCCH is used to trigger a random access process between the first communication device and the second communication device; The processing module is used to determine the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource according to the first information in the PDCCH, the first path loss resource is a quasi-coordinated QCL resource in a TCI state indicated by the transmission configuration adopted by the PDCCH, and the second path loss resource is a synchronization signal block SSB resource indicated in the PDCCH; The transceiver module is further configured to send the random access request according to the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource.

23. A second communication device, comprising a transceiver module; The transceiver module is used to send a downlink control channel PDCCH, and the PDCCH is used to trigger a random access process between the first communication device and the second communication device; receive a random access request, and the random access request is sent according to the path loss corresponding to the first path loss resource or the path loss corresponding to the second path loss resource determined according to the first information in the PDCCH, the first path loss resource is a quasi-coordinated QCL resource in the TCI state indicated by the transmission configuration adopted by the PDCCH, and the second path loss resource is a synchronization signal block SSB resource indicated in the PDCCH.

24. The first communication device according to claim 22 or the second communication device according to claim 23, characterized in that: The first information is the first field in the PDCCH.

25. The first communication device or the second communication device according to claim 24, characterized in that: The first field is used to indicate a timing advance group TAG; If the TAG indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the TAG indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the random access request is sent according to the path loss corresponding to the second path loss resource.

26. The first communication device according to claim 25, characterized in that: The transceiver module is also used for: A random access response is received, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response, and the TAG indicated by the second field is the same as the TAG indicated by the first field.

27. The first communication device or the second communication device according to claim 24, characterized in that: The first field is used to indicate a control channel group identifier; If the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the random access request is sent according to the path loss corresponding to the second path loss resource.

28. The first communication device according to claim 27, characterized in that: The transceiver module is also used for: receiving a random access response, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response message; If the control channel group identifier indicated by the first field is the same as the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH; or, If the control channel group identifier indicated by the first field is different from the control channel group identifier corresponding to the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

29. The first communication device or the second communication device according to claim 24, characterized in that: The first field is used to indicate that the random access procedure is a first type of random access procedure or a second type of random access procedure; If the random access procedure is a first type of random access procedure, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the random access procedure is a second type of random access procedure, the random access request is sent according to the path loss corresponding to the second path loss resource.

30. The first communication device or the second communication device according to claim 29, characterized in that: The first type of random access process includes: a random access process in which a transmission reception point TRP corresponding to the first type of random access process is the same as a TRP for sending the PDCCH; or A random access process in which a TAG corresponding to the first type of random access process is the same as a TAG associated with a TCI state used by the PDCCH; or A random access procedure in which the control channel group identifier corresponding to the first type of random access procedure is the same as the control channel group identifier corresponding to the PDCCH.

31. The first communication device or the second communication device according to claim 29, characterized in that: The second type of random access process includes: a random access process in which a transmission reception point TRP corresponding to the second type of random access process is different from a TRP for sending the PDCCH; or A random access process in which a TAG corresponding to the second type of random access process is different from a TAG associated with a TCI state adopted by the PDCCH; or A random access procedure in which a control channel group identifier corresponding to the second type of random access procedure is different from a control channel group identifier corresponding to the PDCCH.

32. The first communication device according to any one of claims 29 to 31, characterized in that: The transceiver module is also used for: receiving a random access response, the random access response comprising a second field, the second field being used to indicate a random access response; The TAG corresponding to the carried timing advance TA; If the random access procedure is a first type of random access procedure, the TAG indicated by the second field is the same as the TAG associated with the TCI state adopted by the PDCCH; or, If the random access procedure is a second type of random access procedure, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

33. The first communication device or the second communication device according to claim 24, characterized in that: The first field is used to indicate that the random access request is sent according to the path loss corresponding to the first path loss resource or to indicate that the random access request is sent according to the path loss corresponding to the second path loss resource.

34. The first communication device according to claim 33, characterized in that: The transceiver module is also used for: receiving a random access response, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response; If the first field indicates that the random access request is sent according to the path loss corresponding to the first path loss resource, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH; or, If the first field indicates that the random access request is sent according to the path loss corresponding to the second path loss resource, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

35. The first communication device or the second communication device according to claim 24, characterized in that: The first field is used to indicate SSB resources; If the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the random access request is sent according to the path loss corresponding to the second path loss resource.

36. The first communication device according to claim 35, characterized in that: The transceiver module is also used for: receiving a random access response, where the random access response includes a second field, where the second field is used to indicate a TAG corresponding to a timing advance TA carried in the random access response; If the TAG associated with the SSB resource indicated by the first field is the same as the TAG associated with the TCI state used by the PDCCH, the TAG indicated by the second field is the same as the TAG associated with the TCI state used by the PDCCH; or, If the TAG associated with the SSB resource indicated by the first field is different from the TAG associated with the TCI state adopted by the PDCCH, the TAG indicated by the second field is different from the TAG associated with the TCI state adopted by the PDCCH.

37. The first communication device or the second communication device according to any one of claims 25 to 36, characterized in that: When a first condition is met, the PDCCH includes the first information; wherein the first condition includes one or more of the following: Two TAGs are configured in the serving cell corresponding to the PDCCH; Two control channel groups are configured in the serving cell corresponding to the PDCCH; or, The serving cell corresponding to the PDCCH has no associated supplementary cell.

38. The first communication device or the second communication device according to claim 24, characterized in that: When the second condition is met, the first field is used to indicate a TAG, or the first field is used to indicate whether the TAG corresponding to the random access process is the same as the TAG corresponding to the TCI state adopted by the PDCCH, or the first field is used to indicate a control channel group identifier, or the first field is used to indicate whether the control channel group identifier corresponding to the random access process is the same as the control channel group identifier corresponding to the PDCCH, or the first field is used to indicate that the random access process is a first type random access process or a second type random access process, or the first field is used to indicate that the random access request is sent according to the path loss corresponding to the first path loss resource or that the random access request is sent according to the path loss corresponding to the second path loss resource; wherein the second condition includes one or more of the following: Two TAGs are configured in the serving cell corresponding to the PDCCH; Two control channel groups are configured in the serving cell corresponding to the PDCCH; or, The serving cell corresponding to the PDCCH has no associated supplementary cell.

39. The first communication device or the second communication device according to claim 24, characterized in that: When the third condition is met, the first field is used to indicate that the cell corresponding to the random access process is the serving cell corresponding to the PDCCH, or to indicate that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell; wherein the third condition includes at least one of the following: Two TAGs are configured in the serving cell corresponding to the PDCCH; Two control channel groups are configured in the serving cell corresponding to the PDCCH; or, The serving cell corresponding to the PDCCH is configured with an associated supplementary cell.

40. The first communication device or the second communication device according to claim 39, characterized in that: If the PDCCH is sent through the serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the serving cell, sending the random access request according to the path loss corresponding to the first path loss resource; or, If the PDCCH is sent through the serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell, the random access request is sent according to the path loss corresponding to the second path loss resource; or, If the PDCCH is sent through an activated supplementary cell associated with a serving cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is the serving cell, sending the random access request according to the path loss corresponding to the second path loss resource; or, If the PDCCH is sent through an activated supplementary cell associated with the service cell corresponding to the PDCCH, and the first field indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the service cell, then the random access request is sent according to the path loss corresponding to the first path loss resource.

41. The first communication device or the second communication device according to any one of claims 38 to 40, characterized in that: When a fourth condition is met, the PDCCH includes the first field; wherein the fourth condition includes one or more of the following: Two TAGs are configured in the serving cell corresponding to the PDCCH; or, Two control channel groups are configured in the serving cell corresponding to the PDCCH.

42. The first communication device or the second communication device according to any one of claims 22 to 41, characterized in that: The third field in the PDCCH is used to indicate that the cell corresponding to the random access process is the serving cell corresponding to the PDCCH, or indicates that the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell; the random access response message includes a TA value; If the cell corresponding to the random access process is the serving cell, the TA value is the TA value corresponding to the first TAG of the serving cell; or, If the cell corresponding to the random access process is an activated supplementary cell associated with the serving cell, the TA value is a TA value corresponding to the second TAG of the serving cell.

43. A communication device, characterized in that: The communication device comprises a processor configured to execute a computer program or computer instructions in a memory to perform the method according to any one of claims 1 to 21.

44. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a communication device, the communication device executes the method according to any one of claims 1 to 21.

45. A communication system, characterized in that: The communication system includes terminal equipment and network equipment; The terminal device is used to execute the method according to any one of claims 1 to 21, and the network device is used to execute the method according to any one of claims 2 to 4, 6, 8 to 10, 12, 14, and 16 to 21.

46. ​​A computer program product, characterized in that When the computer program product is run on a computer, the computer is caused to perform the method according to any one of claims 1 to 21.

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