Timing advance obtaining method and device and storage medium

Abstract

The invention provides a timing advance obtaining method and device and a storage medium, and relates to the technical field of communication. The method comprises the following steps: sending a message 1 to a first network device based on a spatial filter; or sending the SRS to the first network device based on the spatial filter. The spatial filter is a spatial filter corresponding to the SRS, or the spatial filter is a specified spatial filter; receiving a response message sent by the second network equipment; the response message comprises the timing advance, and the response message is sent by the first network device to the second network device. For a UL-only TRP scene, when there is no downlink communication link between a network device and a terminal device, in a process of obtaining a TA, a spatial filter used when a message in a random access process is sent to the network device is determined, so that the terminal device can send the message in the random access process to the network device, and the user experience is improved. And the terminal equipment can obtain the TA.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 202410053672.2 and the application title "Method, apparatus and storage medium for obtaining timing advance", which was filed with the Chinese Patent Office on January 12, 2024, and the entire content of which is incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technologies, and in particular, to a method, apparatus and storage medium for obtaining timing advance. Background Art

[0003] In the process of communication between a terminal device and a network device, there is often a situation where there is no downlink communication link between the terminal device and the network device (i.e., the UL-only TRP scenario).

[0004] In the above scenario, the network device cannot send downlink information to the terminal device. As a result, the network device cannot inform the terminal device of the spatial filter used when feeding back the signaling in the random access process, resulting in the terminal device being unable to send the signaling in the random access process to the network device, and the terminal device being unable to obtain the timing advance (TA). Summary of the Invention

[0005] This application provides a method, apparatus and storage medium for obtaining timing advance, which realizes that in the case where there is no downlink communication link between the terminal device and the network device (i.e., the UL-only TRP scenario), the terminal device can send the signaling in the random access process to the network device based on the spatial filter, so that the terminal device can obtain the TA in a timely manner.

[0006] In a first aspect, this application provides a method for obtaining timing advance, the method including:

[0007] Based on a spatial filter, send Message 1 to a first network device, where Message 1 includes a preamble, and the preamble is used to determine the timing advance, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, based on a spatial filter, send a channel sounding reference signal to a first network device, where the channel sounding reference signal is used to determine the timing advance, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter;

[0008] Receive a response message sent by a second network device; where the response message includes the timing advance, and the response message is sent by the first network device to the second network device.

[0009] In this embodiment, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, the spatial filter used when sending a message in the random access process to the network device is determined, so that the terminal device can send a message in the random access process to the network device and the terminal device can obtain TA; it can also be implemented for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, the spatial filter used when sending a message in the random access process to the network device and the transmission power used when sending a message in the random access process to the network device are determined; so that the terminal device can send a message in the random access process to the network device and the terminal device can obtain TA.

[0010] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1;

[0011] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0012] In this embodiment, multiple selection methods for the spatial filter are provided. The spatial filter used by the terminal device when sending Message 1 to the first network device can be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1, or a fixed spatial filter, or a spatial filter in a preset group of spatial filters. Thus, it is convenient for the terminal device to send Message 1 or SRS in the random access process to the first network device based on the spatial filter.

[0013] In an optional embodiment, the method further includes:

[0014] Receiving first indication information sent by the second network device; wherein, the first indication information is used to indicate the channel sounding reference signal associated with Message 1.

[0015] In this embodiment, the second network device needs to send first indication information to the terminal device, and the first indication information is used to indicate the SRS associated with Message 1. Further, the terminal device can determine the SRS associated with Message 1 according to the first indication information, and further can determine that the spatial filter (i.e., beam) used when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS).

[0016] In an alternative embodiment, receiving the first indication information sent by the second network device includes:

[0017] Receiving the first downlink control information sent by the second network device; wherein, the first indication information is included in the first downlink control information;

[0018] Or, receiving the first radio resource control message sent by the second network device; wherein, the first indication information is included in the first radio resource control message;

[0019] Or, receiving the first media access control message sent by the second network device; wherein, the first indication information is included in the first media access control message.

[0020] In this embodiment, the first indication information can be carried by the following messages: the first downlink control information (PDCCH order information), the first radio resource control (RRC) message, and the first media access control (MAC CE) message. Further, the second network device can inform the terminal device of the first indication information in various ways, so that the terminal device can determine the SRS associated with Message 1, and further can determine that the spatial filter (i.e., beam) used when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS).

[0021] In an alternative embodiment, the method further includes:

[0022] Receiving the second indication information sent by the second network device; wherein, the second indication information is used to indicate the repetition count of Message 1.

[0023] In this embodiment, the second network device needs to indicate the repetition count of Message 1. The second network device sends the second indication information to the terminal device, and the second indication information is used to indicate the repetition count of Message 1. Further, the terminal device uses a fixed spatial filter to send Message 1 to the first network device based on the repetition count indicated by the second indication information.

[0024] In an alternative embodiment, receiving the second indication information sent by the second network device includes:

[0025] Receive a second radio resource control message sent by a second network device; wherein, the second radio resource control message includes second indication information;

[0026] Alternatively, receive a second media access control message sent by the second network device; wherein, the second media access control message includes second indication information.

[0027] In this embodiment, the second indication information can be carried by the following messages: a second radio resource control (RRC) message, a second media access control (MAC CE) message. Further, the second network device can inform the terminal device of the second indication information in multiple ways, so that the terminal device can send Message 1 to the first network device using a fixed spatial filter based on the repetition transmission times indicated by the second indication information.

[0028] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time-domain resource for transmitting the channel sounding reference signal;

[0029] Alternatively, the method further includes: receiving third indication information sent by the second network device, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0030] In this embodiment, the configuration information of the channel sounding reference signal indicates the time-domain resource for transmitting the channel sounding reference signal. Alternatively, the second network device needs to send third indication information to the terminal device, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs. Further, the terminal device can determine the time-domain resource of the SRS, or determine the cell to which the SRS belongs.

[0031] In an alternative embodiment, receiving the third indication information sent by the second network device includes:

[0032] Receiving a first downlink control information sent by the second network device; wherein, the first downlink control information includes the third indication information; or, the first downlink control information is used to indicate that the terminal device transmits a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes the third indication information;

[0033] Alternatively, receive a third radio resource control message sent by the second network device; wherein, the third radio resource control message includes the third indication information;

[0034] Alternatively, receive a third media access control message sent by the second network device; wherein, the third media access control message includes the third indication information.

[0035] In this embodiment, the third indication information is indicated in multiple ways, so that the terminal device can determine the cell to which the SRS belongs.

[0036] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0037] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information;

[0038] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0039] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0040] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0041] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes a plurality of channel sounding reference signals;

[0042] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals;

[0043] Or, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is the joint transmission indication status information pool, or the status information pool is the uplink transmission indication status information pool;

[0044] Or, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0045] In this embodiment, multiple selection methods for the spatial filter are provided, facilitating the terminal device to send a message during the random access procedure to the first network device based on the spatial filter, so that the terminal device can obtain the TA.

[0046] In an alternative embodiment, the transmission power of message 1 is the minimum of the following powers: the maximum transmit power of the terminal device, the second preset power; where the second preset power is the sum of the target receive power of message 1 and the path loss power of the uplink-only receiving point;

[0047] The path loss power of the uplink-only receiving point is the difference between the received power configured for the channel sounding reference signal and the transmitted power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink received signal power difference, where the uplink received signal power difference is the difference between the uplink received signal power of the first network device and the uplink received signal power of the second network device.

[0048] In this embodiment, the terminal device can determine the transmission power of Message 1 based on the above parameters. Further, the terminal device sends Message 1 to the first network device according to the transmission power of Message 1 and the spatial filter.

[0049] In an alternative embodiment, the method further includes:

[0050] Receiving fifth indication information sent by the second network device; wherein, the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink received signal power difference.

[0051] In this embodiment, the second network device needs to send the path loss power of the uplink-only receiving point or the uplink received signal power difference to the terminal device in advance. The second network device can send the fifth indication information to the terminal device; wherein, the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink received signal power difference. Thus, the terminal device determines the transmission power of Message 1 based on the path loss power of the uplink-only receiving point to send Message 1 to the first network device. Or, the terminal device determines the transmission power of Message 1 based on the uplink received signal power difference to send Message 1 to the first network device.

[0052] In an alternative embodiment, receiving the fifth indication information sent by the second network device includes:

[0053] Receiving second downlink control information sent by the second network device; wherein, the second downlink control information includes the fifth indication information;

[0054] Or, receiving high-layer signaling sent by the second network device; wherein, the high-layer signaling includes the fifth indication information.

[0055] In this embodiment, multiple indication methods for indicating the path loss power of the uplink-only receiving point or the uplink received signal power difference are provided. The fifth indication information can be a separate signaling, or the fifth indication information is carried by high-layer signaling, or the fifth indication information is carried by downlink control information. So that the terminal device can determine the transmission power of Message 1 based on the path loss power of the uplink-only receiving point or the uplink received signal power difference to send Message 1 to the first network device.

[0056] In an alternative embodiment, the transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, and a first preset power; the first preset power is determined based on a transmission power difference;

[0057] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by a first network device and the transmission power of the channel sounding reference signal transmitted by a second network device.

[0058] In this embodiment, the terminal device can determine the transmission power of the SRS based on the above parameters. Further, the terminal device transmits the SRS to the first network device according to the transmission power of the transmitted SRS and the spatial filter.

[0059] In an alternative embodiment, the method further includes:

[0060] Receiving fourth indication information sent by a second network device; wherein the fourth indication information is used to indicate the transmission power difference.

[0061] In this embodiment, the second network device needs to send the transmission power difference to the terminal device in advance. The second network device can send the fourth indication information to the terminal device; wherein the fourth indication information is used to indicate the transmission power difference. Thus, the terminal device determines the transmission power of the SRS based on the transmission power difference, so as to transmit the SRS to the first network device.

[0062] In an alternative embodiment, receiving the fourth indication information sent by the second network device includes:

[0063] Receiving first downlink control information sent by the second network device, wherein the first downlink control information includes the fourth indication information;

[0064] Or, receiving a fourth radio resource control message sent by the second network device; wherein the fourth radio resource control message includes the fourth indication information;

[0065] Or, receiving a fourth media access control message sent by the second network device; wherein the fourth media access control message includes the fourth indication information.

[0066] In this embodiment, multiple indication methods for indicating the transmission power difference are provided. The fourth indication information can be a separate signaling, or the fourth indication information is carried by a high-layer signaling, or the fourth indication information is carried by downlink control information. So as to facilitate the terminal device to determine the transmission power of the SRS based on the transmission power difference, so as to transmit the SRS to the first network device.

[0067] In an alternative embodiment, the method further includes:

[0068] Receive the sixth indication information sent by the second network device; the sixth indication information is used to indicate the spatial filter with the optimal performance.

[0069] Based on the spatial filter indicated by the sixth indication information, send Message 3 to the first network device.

[0070] In this embodiment, the first network device sends the sixth indication information to the terminal device through the second network device; the sixth indication information is used to indicate the spatial filter with the optimal performance; it is convenient for the terminal device to directly determine the spatial filter with the optimal performance, and the terminal device sends Message 3 in the random access process to the first network device based on the spatial filter with the optimal performance.

[0071] In a second aspect, the present application provides a method for obtaining a timing advance amount, and the method includes:

[0072] Receive Message 1 sent by the terminal device based on the spatial filter, where Message 1 includes a preamble, and the preamble is used to determine the timing advance amount. The spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or receive the channel sounding reference signal sent by the terminal device based on the spatial filter, where the channel sounding reference signal is used to determine the timing advance amount. The spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter.

[0073] Send a response message to the second network device; the response message includes the timing advance amount, and the response message is used to feed back to the terminal device.

[0074] In this embodiment, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, determine the spatial filter used when sending Message 3 in the random access process to the network device, so that the terminal device can send Message 3 in the random access process to the network device, and the terminal device can obtain TA; it can also be realized for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, determine the spatial filter used when sending Message 3 in the random access process to the network device and the transmission power used when sending Message 3 in the random access process to the network device; so that the terminal device can send Message 3 in the random access process to the network device, and the terminal device can obtain TA.

[0075] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1;

[0076] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0077] In this embodiment, multiple selection methods of spatial filters are provided. The spatial filter used by the terminal device to send Message 1 to the first network device can be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1, or a fixed spatial filter, or a spatial filter in a preset group of spatial filters. Thus, it is convenient for the terminal device to send Message 1 or SRS in the random access process to the first network device based on the spatial filter.

[0078] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0079] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information;

[0080] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0081] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0082] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0083] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set; the channel sounding reference signal set includes multiple channel sounding reference signals;

[0084] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0085] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool;

[0086] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0087] In this embodiment, multiple selection methods for the spatial filter are provided, facilitating the terminal device to send messages in the random access process to the first network device based on the spatial filter, so that the terminal device can obtain the TA.

[0088] In an alternative embodiment, the transmission power of Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, the second preset power; where the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only reception point;

[0089] The path loss power of the uplink-only reception point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only reception point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0090] In this embodiment, the terminal device can determine the transmission power of Message 1 according to the above parameters. Then, the terminal device sends Message 1 to the first network device according to the transmission power of Message 1 and the spatial filter.

[0091] In an alternative embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference;

[0092] The transmission power difference is the difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0093] In this embodiment, the terminal device can determine the transmission power of the SRS according to the above parameters. Then, the terminal device sends the SRS to the first network device according to the transmission power of the SRS and the spatial filter.

[0094] In a third aspect, the present application provides a method for obtaining a timing advance, the method including:

[0095] Send the first indication information to the terminal device; wherein, the first indication information is used to indicate the channel sounding reference signal associated with Message 1.

[0096] Wherein, the first indication information is used to send Message 1 to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information. Message 1 includes a preamble, and the preamble is used to determine the timing advance. The spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, the first indication information is used to send the sounding reference signal to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information. The channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter.

[0097] Receive the response message sent by the first network device and send the response message to the terminal device; wherein, the response message includes the timing advance.

[0098] In this embodiment, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used when sending the message in the random access process to the network device is determined, so that the terminal device can send the message in the random access process to the network device and the terminal device can obtain the TA; it can also be implemented for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used when sending the message in the random access process to the network device and the transmission power used when sending the message in the random access process to the network device are determined; so that the terminal device can send the message in the random access process to the network device and the terminal device can obtain the TA.

[0099] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1.

[0100] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is the spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0101] In this embodiment, multiple selection methods for spatial filters are provided. The spatial filter used by the terminal device when sending Message 1 to the first network device can be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1, or a fixed spatial filter, or a spatial filter in a preset set of spatial filters. This facilitates the terminal device to send Message 1 or SRS in the random access process to the first network device based on the spatial filter.

[0102] In an alternative embodiment, the method further includes:

[0103] Sending first indication information to the terminal device; wherein, the first indication information is used to indicate the channel sounding reference signal associated with Message 1.

[0104] In this embodiment, the second network device needs to send first indication information to the terminal device, and this first indication information is used to indicate the SRS associated with Message 1. Further, the terminal device can determine the SRS associated with Message 1 according to the first indication information, and further can determine that the spatial filter (i.e., beam) used when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS).

[0105] In an alternative embodiment, sending the first indication information to the terminal device includes:

[0106] Sending first downlink control information to the terminal device; wherein, the first downlink control information includes the first indication information;

[0107] Or, sending a first radio resource control message to the terminal device; wherein, the first radio resource control message includes the first indication information;

[0108] Or, sending a first media access control message to the terminal device; wherein, the first media access control message includes the first indication information.

[0109] In this embodiment, the first indication information can be carried by the following messages: first downlink control information (PDCCH order information), first radio resource control (RRC) message, first media access control (MAC CE) message. Further, the second network device can inform the terminal device of the first indication information in multiple ways, so that the terminal device can determine the SRS associated with Message 1, and further can determine that the spatial filter (i.e., beam) used when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS).

[0110] In an alternative embodiment, the method further includes:

[0111] Send second indication information to the terminal device; wherein, the second indication information is used to indicate the number of times of retransmitting Message 1.

[0112] In this embodiment, the second network device needs to indicate the number of times of retransmitting Message 1. The second network device sends second indication information to the terminal device, and the second indication information is used to indicate the number of times of retransmitting (repetition) Message 1. Furthermore, the terminal device sends Message 1 to the first network device using a fixed spatial filter based on the number of times of retransmitting (repetition) indicated by the second indication information.

[0113] In an alternative embodiment, sending second indication information to the terminal device includes:

[0114] Send a second radio resource control message to the terminal device; wherein, the second radio resource control message includes the second indication information;

[0115] Or, send a second media access control message to the terminal device; wherein, the second media access control message includes the second indication information.

[0116] In this embodiment, the second indication information can be carried by the following messages: the second radio resource control (RRC) message, the second media access control (MAC CE) message. Furthermore, the second network device can inform the terminal device of the second indication information in various ways, so that the terminal device sends Message 1 to the first network device using a fixed spatial filter based on the number of times of retransmitting (repetition) indicated by the second indication information.

[0117] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for sending the channel sounding reference signal;

[0118] Or, the method further includes: sending third indication information to the terminal device, and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs. In this embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for sending the channel sounding reference signal. Or, the second network device needs to send third indication information to the terminal device, and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs. Furthermore, the terminal device can determine the time domain resource of the SRS, or determine the cell to which the SRS belongs.

[0119] In an alternative embodiment, sending third indication information to the terminal device includes:

[0120] Send the first downlink control information to the terminal device; wherein, the first downlink control information includes third indication information, or the first downlink control information is used to instruct the terminal device to send a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes third indication information;

[0121] Or, send a third radio resource control message to the terminal device; wherein, the third radio resource control message includes third indication information;

[0122] Or, send a third media access control message to the terminal device; wherein, the third media access control message includes third indication information. In this embodiment, the third indication information is indicated in multiple ways, so that the terminal device can determine the cell to which the SRS belongs.

[0123] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0124] The spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information;

[0125] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0126] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0127] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0128] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals;

[0129] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals;

[0130] Or, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is the joint transmission indication status information pool, or the status information pool is the uplink transmission indication status information pool;

[0131] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0132] In this embodiment, multiple selection methods for the spatial filter are provided, facilitating the terminal device to send messages during the random access process to the first network device based on the spatial filter, so that the terminal device can obtain the TA.

[0133] In an alternative embodiment, the transmission power of Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, and a second preset power; where the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only reception point.

[0134] The path loss power of the uplink-only reception point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or the path loss power of the uplink-only reception point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0135] In this embodiment, the terminal device can determine the transmission power of Message 1 based on the above parameters. Then, the terminal device sends Message 1 to the first network device according to the transmission power of Message 1 and the spatial filter.

[0136] In an alternative embodiment, the method further includes:

[0137] Sending fifth indication information to the terminal device; where the fifth indication information is used to indicate the path loss power of the uplink-only reception point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0138] In this embodiment, the second network device needs to send the path loss power of the uplink-only reception point or the uplink reception signal power difference to the terminal device in advance. The second network device can send fifth indication information to the terminal device; where the fifth indication information is used to indicate the path loss power of the uplink-only reception point, or the fifth indication information is used to indicate the uplink reception signal power difference. Thus, the terminal device determines the transmission power of Message 1 based on the path loss power of the uplink-only reception point to send Message 1 to the first network device. Or, the terminal device determines the transmission power of Message 1 based on the uplink reception signal power difference to send Message 1 to the first network device.

[0139] In an alternative embodiment, sending the fifth indication information to the terminal device includes:

[0140] Send the second downlink control information to the terminal device; wherein, the second downlink control information includes fifth indication information;

[0141] Alternatively, send high-layer signaling to the terminal device; wherein, the high-layer signaling includes fifth indication information.

[0142] In this embodiment, multiple indication methods for indicating the path loss power of the uplink-only receiving point or the difference in uplink received signal power are provided. The fifth indication information can be a separate signaling, or the fifth indication information is carried by high-layer signaling, or the fifth indication information is carried by downlink control information. So that the terminal device can determine the transmission power of Message 1 based on the path loss power of the uplink-only receiving point or the difference in uplink received signal power, and send Message 1 to the first network device.

[0143] In an alternative embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference;

[0144] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0145] In this embodiment, the terminal device can determine the transmission power of the SRS based on the above parameters. Furthermore, the terminal device sends the SRS to the first network device according to the transmission power of the SRS and the spatial filter.

[0146] In an alternative embodiment, the method further includes:

[0147] Send fourth indication information to the terminal device; wherein, the fourth indication information is used to indicate the transmission power difference.

[0148] In this embodiment, the second network device needs to send the transmission power difference to the terminal device in advance. The second network device can send fourth indication information to the terminal device; wherein, the fourth indication information is used to indicate the transmission power difference. Thus, the terminal device determines the transmission power of the SRS based on the transmission power difference and sends the SRS to the first network device.

[0149] In an alternative embodiment, sending the fourth indication information to the terminal device includes:

[0150] Send the first downlink control information to the terminal device, wherein the first downlink control information includes the fourth indication information;

[0151] Alternatively, send the fourth radio resource control message to the terminal device; wherein, the fourth radio resource control message includes the fourth indication information;

[0152] Alternatively, send a fourth media access control message to the terminal device; wherein, the fourth media access control message includes fourth indication information.

[0153] In this embodiment, multiple indication methods for indicating the transmit power difference are provided. The fourth indication information can be a separate signaling, or the fourth indication information is carried by a high-layer signaling, or the fourth indication information is carried by downlink control information. So that the terminal device can determine the transmit power of the SRS based on the transmit power difference and send the SRS to the first network device.

[0154] In an alternative embodiment, the method further includes:

[0155] Send sixth indication information to the terminal device; wherein, the sixth indication information is used to indicate the spatial filter with the optimal performance; the spatial filter indicated by the sixth indication information is used to send message 3 to the first network device based on the spatial filter.

[0156] In this embodiment, the first network device sends the sixth indication information to the terminal device through the second network device; wherein, the sixth indication information is used to indicate the spatial filter with the optimal performance; facilitating the terminal device to directly determine the spatial filter with the optimal performance, and the terminal device sends message 3 in the random access procedure to the first network device based on the spatial filter with the optimal performance.

[0157] Fourthly, the present application provides an apparatus for obtaining a timing advance, the apparatus includes: a memory, a transceiver, and a processor:

[0158] The memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations:

[0159] Based on a spatial filter, send message 1 to the first network device, wherein, message 1 includes a preamble, the preamble is used to determine the timing advance, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, based on a spatial filter, send a channel sounding reference signal to the first network device, wherein, the channel sounding reference signal is used to determine the timing advance, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter;

[0160] Receive a response message sent by the second network device; wherein, the response message includes the timing advance, and the response message is sent by the first network device to the second network device.

[0161] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1;

[0162] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0163] In an alternative embodiment, the processor is further configured to:

[0164] Receive first indication information sent by a second network device; wherein, the first indication information is used to indicate the channel sounding reference signal associated with Message 1.

[0165] In an alternative embodiment, when receiving the first indication information sent by the second network device, the processor is specifically configured to:

[0166] Receive first downlink control information sent by the second network device; wherein, the first downlink control information includes the first indication information;

[0167] Or, receive a first radio resource control message sent by the second network device; wherein, the first radio resource control message includes the first indication information;

[0168] Or, receive a first media access control message sent by the second network device; wherein, the first media access control message includes the first indication information.

[0169] In an alternative embodiment, the processor is further configured to:

[0170] Receive second indication information sent by the second network device; wherein, the second indication information is used to indicate the number of retransmissions of Message 1.

[0171] In an alternative embodiment, when receiving the second indication information sent by the second network device, the processor is specifically configured to:

[0172] Receive a second radio resource control message sent by the second network device; wherein, the second radio resource control message includes the second indication information;

[0173] Or, receive a second media access control message sent by the second network device; wherein, the second media access control message includes the second indication information.

[0174] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for transmitting the channel sounding reference signal;

[0175] Alternatively, the processor is further configured to: receive third indication information sent by a second network device, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0176] In an optional embodiment, when the processor receives the third indication information sent by the second network device, it is specifically configured to:

[0177] receive first downlink control information sent by the second network device; where the first downlink control information includes the third indication information; or, the first downlink control information is used to instruct the terminal device to send a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes the third indication information;

[0178] Alternatively, receive a third radio resource control message sent by the second network device; where the third radio resource control message includes the third indication information;

[0179] Alternatively, receive a third media access control message sent by the second network device; where the third media access control message includes the third indication information.

[0180] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following: the spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information;

[0181] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0182] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0183] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0184] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals;

[0185] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals;

[0186] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool;

[0187] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0188] In an alternative embodiment, the transmission power of Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, and a second preset power; where the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only reception point;

[0189] The path loss power of the uplink-only reception point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only reception point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, where the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0190] In an alternative embodiment, the processor is further configured to:

[0191] Receive fifth indication information sent by the second network device; where the fifth indication information is used to indicate the path loss power of the uplink-only reception point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0192] In an alternative embodiment, when receiving the fifth indication information sent by the second network device, the processor is specifically configured to:

[0193] Receive second downlink control information sent by the second network device; where the second downlink control information includes the fifth indication information;

[0194] Or, receive high-layer signaling sent by the second network device; where the high-layer signaling includes the fifth indication information.

[0195] In an alternative embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, and a first preset power; the first preset power is determined based on the transmission power difference;

[0196] The transmission power difference is the difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0197] In an alternative embodiment, the processor is further configured to:

[0198] Receive fourth indication information sent by a second network device; wherein the fourth indication information is used to indicate a transmission power difference.

[0199] In an alternative embodiment, when receiving the fourth indication information sent by the second network device, the processor is specifically configured to:

[0200] Receive first downlink control information sent by the second network device, where the first downlink control information includes the fourth indication information;

[0201] Or, receive a fourth radio resource control message sent by the second network device; wherein the fourth radio resource control message includes the fourth indication information;

[0202] Or, receive a fourth media access control message sent by the second network device; wherein the fourth media access control message includes the fourth indication information.

[0203] In an alternative embodiment, the processor is further configured to:

[0204] Receive sixth indication information sent by the second network device; wherein the sixth indication information is used to indicate the spatial filter with optimal performance;

[0205] Based on the spatial filter indicated by the sixth indication information, send Message 3 to the first network device.

[0206] In a fifth aspect, the present application provides an apparatus for obtaining a timing advance, the apparatus includes: a memory, a transceiver, a processor:

[0207] The memory is used to store a computer program; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations:

[0208] Receive Message 1 sent by a terminal device based on a spatial filter, where Message 1 includes a preamble, the preamble is used to determine the timing advance, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or receive a channel sounding reference signal sent by the terminal device based on a spatial filter, where the channel sounding reference signal is used to determine the timing advance, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter;

[0209] Send a response message to the second network device; wherein the response message includes the timing advance, and the response message is used to feed back to the terminal device.

[0210] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1;

[0211] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0212] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0213] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information;

[0214] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0215] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0216] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0217] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set; the channel sounding reference signal set includes multiple channel sounding reference signals;

[0218] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0219] Or, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is the joint transmission indication status information pool, or the status information pool is the uplink transmission indication status information pool;

[0220] Or, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0221] In an alternative embodiment, the transmission power of message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, and the second preset power; wherein, the second preset power is the sum of the target reception power of message 1 and the path loss power of the uplink-only receiving point.

[0222] The path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0223] In an alternative embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, and the first preset power; the first preset power is determined based on the transmission power difference.

[0224] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0225] In a sixth aspect, the present application provides an apparatus for obtaining a timing advance, the apparatus comprising: a memory, a transceiver, and a processor:

[0226] The memory is configured to store a computer program; the transceiver is configured to transmit and receive data under the control of the processor; the processor is configured to read the computer program in the memory and perform the following operations:

[0227] Send first indication information to the terminal device; wherein, the first indication information is used to indicate the channel sounding reference signal associated with message 1.

[0228] Wherein, the first indication information is used to send message 1 to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, and the preamble is included in message 1, and the preamble is used to determine the timing advance, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, the first indication information is used to send the sounding reference signal to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, and the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter.

[0229] Receive a response message sent by the first network device and send the response message to the terminal device; wherein, the timing advance is included in the response message.

[0230] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1;

[0231] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0232] In an alternative embodiment, the processor is further configured to:

[0233] Send first indication information to the terminal device; wherein, the first indication information is used to indicate the channel sounding reference signal associated with Message 1.

[0234] In an alternative embodiment, when the processor sends the first indication information to the terminal device, it is specifically configured to:

[0235] Send first downlink control information to the terminal device; wherein, the first downlink control information includes the first indication information;

[0236] Or, send a first radio resource control message to the terminal device; wherein, the first radio resource control message includes the first indication information;

[0237] Or, send a first media access control message to the terminal device; wherein, the first media access control message includes the first indication information.

[0238] In an alternative embodiment, the processor is further configured to:

[0239] Send second indication information to the terminal device; wherein, the second indication information is used to indicate the repetition count of Message 1.

[0240] In an alternative embodiment, when the processor sends the second indication information to the terminal device, it is specifically configured to:

[0241] Send a second radio resource control message to the terminal device; wherein, the second radio resource control message includes the second indication information;

[0242] Or, send a second media access control message to the terminal device; wherein, the second media access control message includes the second indication information.

[0243] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for transmitting the channel sounding reference signal;

[0244] Alternatively, the processor is further configured to: send third indication information to the terminal device, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0245] In an alternative embodiment, when the processor sends the third indication information to the terminal device, it is specifically configured to:

[0246] send first downlink control information to the terminal device; wherein, the third indication information is included in the first downlink control information; or, the first downlink control information is used to instruct the terminal device to send a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes the third indication information;

[0247] Alternatively, send a third radio resource control message to the terminal device; wherein, the third indication information is included in the third radio resource control message;

[0248] Alternatively, send a third media access control message to the terminal device; wherein, the third indication information is included in the third media access control message.

[0249] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0250] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information;

[0251] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0252] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0253] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0254] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set; the channel sounding reference signal set includes multiple channel sounding reference signals;

[0255] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0256] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool;

[0257] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0258] In an alternative embodiment, the transmission power of Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, the second preset power; where the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only receiving point;

[0259] The path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0260] In an alternative embodiment, the processor is further configured to:

[0261] Send fifth indication information to the terminal device; where the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0262] In an alternative embodiment, when the processor sends the fifth indication information to the terminal device, it is specifically configured to:

[0263] Send second downlink control information to the terminal device; where the second downlink control information includes the fifth indication information;

[0264] Or, send high-layer signaling to the terminal device; where the high-layer signaling includes the fifth indication information.

[0265] In an alternative embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference;

[0266] The transmission power difference is the difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0267] In an alternative embodiment, the processor is further configured to:

[0268] Send fourth indication information to the terminal device; wherein, the fourth indication information is used to indicate the transmit power difference.

[0269] In an alternative embodiment, when the processor sends the fourth indication information to the terminal device, it is specifically configured to:

[0270] Send first downlink control information to the terminal device, wherein the first downlink control information includes the fourth indication information;

[0271] Or, send a fourth radio resource control message to the terminal device; wherein, the fourth radio resource control message includes the fourth indication information;

[0272] Or, send a fourth media access control message to the terminal device; wherein, the fourth media access control message includes the fourth indication information.

[0273] In an alternative embodiment, the processor is further configured to:

[0274] Send sixth indication information to the terminal device; wherein, the sixth indication information is used to indicate the space filter with the optimal performance; the space filter indicated by the sixth indication information is used to send Message 3 to the first network device based on this space filter.

[0275] In a seventh aspect, the present application provides an apparatus for obtaining a timing advance, the apparatus includes:

[0276] A first sending module, configured to send Message 1 to the first network device based on a space filter, wherein Message 1 includes a preamble, and the preamble is used to determine the timing advance, the space filter is the space filter corresponding to the channel sounding reference signal, or the space filter is a specified space filter; or, send a channel sounding reference signal to the first network device based on a space filter, wherein the channel sounding reference signal is used to determine the timing advance, the space filter is the space filter corresponding to the channel sounding reference signal, or the space filter is a specified space filter;

[0277] A first receiving module, configured to receive a response message sent by the second network device; wherein, the response message includes the timing advance, and the response message is sent by the first network device to the second network device.

[0278] In an alternative embodiment, when the space filter is the space filter corresponding to the channel sounding reference signal, the space filter is the space filter corresponding to the channel sounding reference signal associated with Message 1;

[0279] When the spatial filter is a specified spatial filter and the spatial filter is a received synchronization signal block, it is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0280] In an alternative embodiment, the apparatus further includes:

[0281] A second receiving module, configured to receive first indication information sent by a second network device; wherein, the first indication information is used to indicate a channel sounding reference signal associated with Message 1.

[0282] In an alternative embodiment, when the second receiving module receives the first indication information sent by the second network device, it is specifically configured to:

[0283] Receive first downlink control information sent by the second network device; wherein, the first downlink control information includes the first indication information;

[0284] Or, receive a first radio resource control message sent by the second network device; wherein, the first radio resource control message includes the first indication information;

[0285] Or, receive a first media access control message sent by the second network device; wherein, the first media access control message includes the first indication information.

[0286] In an alternative embodiment, the apparatus further includes:

[0287] A third receiving module, configured to receive second indication information sent by the second network device; wherein, the second indication information is used to indicate the number of repetitions of Message 1.

[0288] In an alternative embodiment, when the third receiving module receives the second indication information sent by the second network device, it is specifically configured to:

[0289] Receive a second radio resource control message sent by the second network device; wherein, the second radio resource control message includes the second indication information;

[0290] Or, receive a second media access control message sent by the second network device; wherein, the second media access control message includes the second indication information.

[0291] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for transmitting the channel sounding reference signal.

[0292] Alternatively, the apparatus further includes: a fourth receiving module, configured to receive third indication information sent by a second network device, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0293] In an optional embodiment, when receiving the third indication information sent by the second network device, the fourth receiving module is specifically configured to:

[0294] Receive first downlink control information sent by the second network device; where the first downlink control information includes the third indication information; or, the first downlink control information is used to indicate that the terminal device sends a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes the third indication information;

[0295] Or, receive a third radio resource control message sent by the second network device; where the third radio resource control message includes the third indication information;

[0296] Or, receive a third media access control message sent by the second network device; where the third media access control message includes the third indication information.

[0297] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0298] The spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information;

[0299] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0300] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0301] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0302] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set; the channel sounding reference signal set includes multiple channel sounding reference signals;

[0303] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0304] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool;

[0305] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0306] In an optional embodiment, the transmission power of the message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, the second preset power; where the second preset power is the sum of the target reception power of the message 1 and the path loss power of the uplink-only reception point;

[0307] The path loss power of the uplink-only reception point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only reception point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0308] In an optional embodiment, the apparatus further includes:

[0309] A fifth receiving module, configured to receive fifth indication information sent by the second network device; where the fifth indication information is used to indicate the path loss power of the uplink-only reception point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0310] In an optional embodiment, when the fifth receiving module receives the fifth indication information sent by the second network device, it is specifically configured to:

[0311] Receive second downlink control information sent by the second network device; where the second downlink control information includes the fifth indication information;

[0312] Or, receive high-layer signaling sent by the second network device; where the high-layer signaling includes the fifth indication information.

[0313] In an optional embodiment, the transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference;

[0314] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by the first network device and the transmission power of the channel sounding reference signal transmitted by the second network device.

[0315] In an alternative embodiment, the apparatus further comprises:

[0316] A sixth receiving module, configured to receive fourth indication information sent by a second network device; wherein the fourth indication information is used to indicate a transmission power difference.

[0317] In an alternative embodiment, when receiving the fourth indication information sent by the second network device, the sixth receiving module is specifically configured to:

[0318] Receive first downlink control information sent by the second network device, where the first downlink control information includes the fourth indication information;

[0319] Or, receive a fourth radio resource control message sent by the second network device; wherein the fourth radio resource control message includes the fourth indication information;

[0320] Or, receive a fourth media access control message sent by the second network device; wherein the fourth media access control message includes the fourth indication information.

[0321] In an alternative embodiment, the apparatus further comprises:

[0322] A seventh receiving module, configured to receive sixth indication information sent by the second network device; wherein the sixth indication information is used to indicate a space filter with optimal performance.

[0323] A second sending module, configured to send Message 3 to a first network device based on the space filter indicated by the sixth indication information.

[0324] In an eighth aspect, the present application provides an apparatus for obtaining a timing advance. The apparatus comprises:

[0325] A receiving module, configured to receive Message 1 sent by a terminal device based on a space filter, where Message 1 includes a preamble, the preamble is used to determine the timing advance, the space filter is a space filter corresponding to a channel sounding reference signal, or the space filter is a specified space filter; or receive a channel sounding reference signal sent by the terminal device based on a space filter, where the channel sounding reference signal is used to determine the timing advance, the space filter is a space filter corresponding to the channel sounding reference signal, or the space filter is a specified space filter;

[0326] A sending module, configured to send a response message to a second network device; wherein the response message includes the timing advance, and the response message is used to feed back to the terminal device.

[0327] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1;

[0328] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0329] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0330] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information;

[0331] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0332] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0333] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0334] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals;

[0335] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals;

[0336] Or, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is the joint transmission indication status information pool, or the status information pool is the uplink transmission indication status information pool;

[0337] Or, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0338] In an optional embodiment, the transmission power of message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, the second preset power; where the second preset power is the sum of the target reception power of message 1 and the path loss power of the uplink-only receiving point;

[0339] The path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0340] In an optional embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference;

[0341] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0342] In a ninth aspect, the present application provides an apparatus for obtaining a timing advance, and the apparatus includes:

[0343] A first transmission module, configured to send first indication information to the terminal device; where the first indication information is used to indicate the channel sounding reference signal associated with message 1;

[0344] Wherein, the first indication information is used to send message 1 to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, and the preamble included in message 1 is used to determine the timing advance, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, the first indication information is used to send the sounding reference signal to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter;

[0345] A first reception module, configured to receive the response message sent by the first network device and send the response message to the terminal device; where the response message includes the timing advance.

[0346] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with message 1;

[0347] When the spatial filter is a specified spatial filter and the spatial filter is a received synchronization signal block, it is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0348] In an alternative embodiment, the apparatus further includes:

[0349] A second sending module, configured to send first indication information to the terminal device; wherein, the first indication information is used to indicate a channel sounding reference signal associated with Message 1.

[0350] In an alternative embodiment, when the second sending module sends the first indication information to the terminal device, it is specifically configured to:

[0351] Send a first downlink control information to the terminal device; wherein, the first downlink control information includes the first indication information;

[0352] Or, send a first radio resource control message to the terminal device; wherein, the first radio resource control message includes the first indication information;

[0353] Or, send a first media access control message to the terminal device; wherein, the first media access control message includes the first indication information.

[0354] In an alternative embodiment, the apparatus further includes:

[0355] A third sending module, configured to send second indication information to the terminal device; wherein, the second indication information is used to indicate the repetition count of Message 1.

[0356] In an alternative embodiment, when the third sending module sends the second indication information to the terminal device, it is specifically configured to:

[0357] Send a second radio resource control message to the terminal device; wherein, the second radio resource control message includes the second indication information;

[0358] Or, send a second media access control message to the terminal device; wherein, the second media access control message includes the second indication information.

[0359] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for sending the channel sounding reference signal;

[0360] Or, the apparatus further includes: a third sending module, configured to send third indication information to the terminal device, and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0361] In an alternative embodiment, when the third sending module sends the third indication information to the terminal device, it is specifically configured to:

[0362] Send a first downlink control information to the terminal device; wherein, the first downlink control information includes the third indication information; or, the first downlink control information is used to instruct the terminal device to send a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes the third indication information;

[0363] Or, send a third radio resource control message to the terminal device; wherein, the third radio resource control message includes the third indication information;

[0364] Or, send a third media access control message to the terminal device; wherein, the third media access control message includes the third indication information.

[0365] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0366] The spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information;

[0367] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information;

[0368] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information;

[0369] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal;

[0370] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals;

[0371] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals;

[0372] Or, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is the joint transmission indication status information pool, or the status information pool is the uplink transmission indication status information pool;

[0373] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device last time, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device last time.

[0374] In an alternative embodiment, the transmission power of sending Message 1 is the minimum value of the following powers: the maximum transmission power of the terminal device, and a second preset power; wherein, the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only receiving point.

[0375] The path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0376] In an alternative embodiment, the apparatus further includes:

[0377] A fifth sending module, configured to send fifth indication information to the terminal device; wherein, the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0378] In an alternative embodiment, when the fifth sending module sends the fifth indication information to the terminal device, it is specifically configured to:

[0379] Send second downlink control information to the terminal device; wherein, the second downlink control information includes the fifth indication information;

[0380] Or, send high-layer signaling to the terminal device; wherein, the high-layer signaling includes the fifth indication information.

[0381] In an alternative embodiment, the transmission power of sending the channel sounding reference signal is the minimum value of the following powers: the maximum transmission power of the terminal device, and a first preset power; the first preset power is determined based on the transmission power difference.

[0382] The transmission power difference is the difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0383] In an alternative embodiment, the apparatus further includes:

[0384] A sixth sending module, configured to send fourth indication information to the terminal device; wherein, the fourth indication information is used to indicate the transmission power difference.

[0385] In an optional embodiment, when the sixth sending module sends the fourth indication information to the terminal device, it is specifically configured to:

[0386] Send a first downlink control information to the terminal device, where the first downlink control information includes the fourth indication information;

[0387] Or, send a fourth radio resource control message to the terminal device; where the fourth radio resource control message includes the fourth indication information;

[0388] Or, send a fourth media access control message to the terminal device; where the fourth media access control message includes the fourth indication information.

[0389] In an optional embodiment, the apparatus further includes:

[0390] A seventh sending module, configured to send a sixth indication information to the terminal device; where the sixth indication information is used to indicate the spatial filter with the optimal performance; the spatial filter indicated by the sixth indication information is used to send Message 3 to the first network device based on the spatial filter.

[0391] In a tenth aspect, the present application provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the method according to any one of the first aspect, the second aspect, or the third aspect.

[0392] The present application provides a method, an apparatus, and a storage medium for obtaining a timing advance, which can implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determining the spatial filter used when sending a message in the random access process to the network device, so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain the TA; it can also implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determining the spatial filter used when sending a message in the random access process to the network device and the transmission power used when sending a message in the random access process to the network device; so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain the TA.

[0393] It should be understood that the content described in the above Summary of the Invention section is not intended to limit the key or important features of the embodiments of the present invention, nor to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0394] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0395] Figure 1 Scene diagram provided for the present application;

[0396] Figure 2 Schematic flowchart of the method for obtaining timing advance provided by an embodiment of the present application;

[0397] Figure 3 Schematic flowchart of the method for obtaining timing advance provided by an embodiment of the present application;

[0398] Figure 4 Schematic diagram of the spatial filter provided for the present application Figure 1 ;

[0399] Figure 5 Schematic flowchart of the method for obtaining timing advance provided by an embodiment of the present application;

[0400] Figure 6 Schematic diagram of the spatial filter provided for the present application Figure 2 ;

[0401] Figure 7 Schematic flowchart of the method for obtaining timing advance provided by an embodiment of the present application;

[0402] Figure 8 Schematic flowchart of the method for obtaining timing advance provided by an embodiment of the present application;

[0403] Figure 9 Schematic flowchart of the method for obtaining timing advance provided by an embodiment of the present application;

[0404] Figure 10 Schematic signaling interaction flowchart of the method for obtaining timing advance provided by an embodiment of the present application;

[0405] Figure 11 Schematic signaling interaction flowchart of the method for obtaining timing advance provided by an embodiment of the present application;

[0406] Figure 12 Schematic diagram of signaling interaction process for the method of obtaining timing advance provided by an embodiment of the present application;

[0407] Figure 13 Schematic diagram of signaling interaction process for the method of obtaining timing advance provided by an embodiment of the present application;

[0408] Figure 14 Schematic diagram of signaling interaction process for the method of obtaining timing advance provided by an embodiment of the present application;

[0409] Figure 15 Schematic diagram of the structure of the device for obtaining timing advance provided by an embodiment of the present application;

[0410] Figure 16 Schematic diagram of the structure of the device for obtaining timing advance provided by an embodiment of the present application;

[0411] Figure 17 Schematic diagram of the structure of the device for obtaining timing advance provided by an embodiment of the present application;

[0412] Figure 18 Schematic diagram of the structure of the device for obtaining timing advance provided by an embodiment of the present application;

[0413] Figure 19 Schematic diagram of the structure of the device for obtaining timing advance provided by an embodiment of the present application;

[0414] Figure 20 Schematic diagram of the structure of the device for obtaining timing advance provided by an embodiment of the present application. Detailed implementation manners

[0415] In the embodiments of the present invention, the term "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0416] In the embodiments of the present application, the term "a plurality of" means two or more, and other quantifiers are similar.

[0417] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0418] To clearly understand the technical solution of this application, the terms related to the embodiments of this application are first defined as follows:

[0419] 5G: 5th Generation Mobile Communication Technology, the fifth generation of mobile communication technology.

[0420] UE: User Equipment, the user equipment.

[0421] TA: Timing Advance, the timing advance.

[0422] SRS: Sounding Reference Signal, the sounding reference signal.

[0423] SSB: Synchronization Signal / PBCH Block, the synchronization signal block

[0424] TPR: Transmission and Receiving Point, the transmission and receiving point.

[0425] UL: Up Link, the uplink.

[0426] RACH: Random Access Channel, the random access channel.

[0427] RACH-less: Random Access Channel less, random access free.

[0428] PRACH: Physical Random Access Channel, the physical random access channel.

[0429] PDCCH: Physical Downlink Control Channel, the physical downlink control channel.

[0430] PUSCH: Physical Uplink Shared Channel, the physical uplink shared channel.

[0431] PUCCH: Physical Uplink Control Channel, the physical uplink control channel.

[0432] DCI: Downlink Control Information, the downlink control information.

[0433] RRC: Radio Resource Control, radio resource control / radio resource control protocol.

[0434] ID: Identity document, identity card identification number, account number, unique code, exclusive number;

[0435] RSRP: Reference Signal Receiving Power, reference signal receiving power.

[0436] The technical solutions provided by the embodiments of the present application can be applied to multiple systems, especially 5G systems. For example, the applicable systems can be the global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, long term evolution advanced (LTE-A) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G new radio (NR) system, etc. Both terminal devices and network devices are included in these multiple systems. The core network part can also be included in the system, such as the evolved packet system (EPS), 5G system (5GS), etc.

[0437] The terminal device involved in the embodiments of the present application can be a device that provides voice and / or data connectivity to users, such as a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem, etc. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device can be called a user equipment (UE). The wireless terminal device can be a USB storage device, other personal computer memory devices, and dongles, and can also communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device. For example, it can be a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device that exchanges voice and / or data with the radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiated protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA), personal computers, tablets, machine-type communication (MTC) terminal devices, etc. The wireless terminal device can also be called a system, subscriber unit, subscriber station, mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, and wireless access points and routers / modems that meet the limitations of this definition, etc., which are not limited in the embodiments of the present application.

[0438] The network device involved in the embodiments of the present application can be a base station, which may include multiple cells that provide services to terminals. Depending on specific application scenarios, the base station can also be referred to as an access point, or it can be a device in the access network that communicates with wireless terminal devices through one or more sectors over the air interface, or other names. The network device can be used to mutually replace the received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an IP communication network. The network device can also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present application can be an evolved network device (eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), etc., or it can also be a Home evolved Node B (HeNB), a relay node, a femto, a pico, a network test device, etc. The embodiments of the present application do not limit this. In some network architectures, the network device can include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit can also be geographically separated.

[0439] The network device and the terminal device can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. The MIMO transmission can be single-user MIMO or multi-user MIMO. Depending on the form and number of the combined antennas, the MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or it can also be diversity transmission, precoding transmission, beamforming transmission, etc.

[0440] In the embodiments of the present application, when the terminal device sends relevant information or a similar description to the network-side device, it only indicates that the relevant information is sent in the form of a wireless signal, and the intended recipient is the network device, and the network device can obtain the relevant information by receiving the wireless signal.

[0441] Next, taking the 5G system scenario as an example, the embodiments of the present application will be described in detail.

[0442] In the scenario of multi-downlink control information based on multiple transmission points (multi-DCI based multi-TRP), there are multiple network devices. For example, the network device is a TRP.

[0443] For example, in a scenario of multi-downlink control information based on multiple transmission points (multi-DCI based multi-TRP), there are two network devices, namely a first network device and a second network device. There is uplink communication and downlink communication between the terminal device and the first network device, and there is also uplink communication and downlink communication between the terminal device and the second network device.

[0444] The second network device sends first downlink control information (i.e., PDCCH order information) to the terminal device. The PDCCH order information is carried by downlink control information DCI format 1_0, and the PDCCH order information is used to instruct the terminal device to send a message in the random access procedure to the first network device. Then, the terminal device sends a message in the random access procedure (e.g., sends message 1) to the first network device based on a spatial filter, where the spatial filter is the spatial filter for receiving the synchronization signal block indicated by the PDCCH order information. The first network device feeds back a Timing Advance (TA) to the terminal device.

[0445] Alternatively, the first network device sends first downlink control information (i.e., PDCCH order information) to the terminal device. The PDCCH order information is carried by downlink control information DCI format 1_0, and the PDCCH order information is used to instruct the terminal device to send a message in the random access procedure to the first network device. Then, the terminal device sends a message in the random access procedure (e.g., sends message 1) to the first network device based on a spatial filter, where the spatial filter is the spatial filter for receiving the PDCCH order information. The first network device feeds back TA to the terminal device.

[0446] For example, the first network device is TPR1 and the second network device is TPR2. TPR2 sends PDCCH order information to the terminal device. The PDCCH order information is carried by downlink control information DCI format 1_0, and the PDCCH order information is used to instruct the terminal device to send a message in the random access procedure to TPR1. Then, the terminal device sends a message in the random access procedure (e.g., sends message 1) to TPR1 based on a spatial filter, where the spatial filter is the spatial filter for receiving the synchronization signal block indicated by the PDCCH order information. TPR1 feeds back TA to the terminal device.

[0447] Alternatively, TPR1 sends the first downlink control information (i.e., PDCCH order information) to the terminal device. The PDCCH order information is carried by the downlink control information DCI format 1_0, and the PDCCH order information is used to instruct the terminal device to send a message of the random access procedure to TPR1. Subsequently, the terminal device sends a message of the random access procedure (e.g., sends Message 1) to TPR1 based on the spatial filter, where the spatial filter is the spatial filter for receiving the PDCCH order information (PDCCH order DM RS). TPR1 feeds back TA to the terminal device.

[0448] The above process is for the scenario of multi-downlink control information based on multiple transmission points (multi-DCI based multi-TRP). There is uplink communication and downlink communication between the terminal device and each network device. Thus, the terminal device can send a message in the random access procedure to the network device, and then the network device feeds back TA to the terminal device.

[0449] However, during the communication between the terminal device and the network device, there are often situations where there is no downlink communication link between the terminal device and the network device (i.e., UL-only TRP scenario).

[0450] For the UL-only TRP scenario (S-DCI based multi-TRP transmission), the network device cannot send downlink information to the terminal device. Therefore, the network device cannot inform the terminal device of the spatial filter used when feeding back the signaling in the random access procedure, resulting in the terminal device being unable to send the signaling in the random access procedure to the network device and the terminal device being unable to obtain TA.

[0451] Figure 1 The scenario diagram provided by this application is as Figure 1 shown. For the UL-only TRP scenario (S-DCI based multi-TRP transmission), there is no downlink communication link between some network devices and the terminal device. As Figure 1As shown, there are a first network device 01, a second network device 02, and a terminal device 03. There are an uplink communication link and a downlink communication link between the second network device 02 and the terminal device 03; however, there is only an uplink communication link between the first network device 01 and the terminal device 03, and there is no downlink communication link. When it is necessary to obtain the TA determined by the first network device 01, since there is only an uplink communication link between the first network device 01 and the terminal device 03, the first network device 01 cannot send a downlink signal to the terminal device 03, and thus the first network device 01 cannot send PDCCH order information to the terminal device 03; consequently, the terminal device cannot send a message in the random access procedure to the first network device 01 through the spatial filter for receiving the SSB indicated by the PDCCH order information, or the terminal device cannot send a message in the random access procedure to the first network device 01 through the spatial filter indicated by the PDCCH order information sent by the first network device 01.

[0452] Consequently, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determine the spatial filter used when sending a message in the random access procedure to the network device, so that the terminal device can send a message in the random access procedure to the network device, and the terminal device can obtain the TA.

[0453] Moreover, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determine the spatial filter used when sending a message in the random access procedure to the network device and determine the transmission power used when sending a message in the random access procedure to the network device; so that the terminal device can send a message in the random access procedure to the network device, and the terminal device can obtain the TA.

[0454] Figure 2 It is a schematic flowchart of the method for obtaining the timing advance provided by an embodiment of the present application, as Figure 2As shown, the embodiment of the present application provides a method for obtaining a timing advance, which can be applied to a terminal device in the 5G system structure as described above to achieve, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determining the spatial filter used when sending a message in the random access procedure to the network device, so that the terminal device can send a message in the random access procedure to the network device and the terminal device can obtain the TA; it can also be achieved for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determining the spatial filter used when sending a message in the random access procedure to the network device and the transmission power used when sending a message in the random access procedure to the network device; so that the terminal device can send a message in the random access procedure to the network device and the terminal device can obtain the TA. The method provided in this embodiment includes the following steps:

[0455] Step 201: The terminal device sends Message 1 to the first network device based on the spatial filter, where Message 1 includes a preamble, and the preamble is used to determine the timing advance. The spatial filter is the spatial filter corresponding to the channel sounding reference signal.

[0456] In this step, there is an uplink communication link and a downlink communication link between the terminal device and the second network device, but there is only an uplink communication link between the terminal device and the second network device, and there is no downlink communication link.

[0457] The spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS). Furthermore, the terminal device can use the spatial filter corresponding to the SRS to send Message 1 to the first network device, where Message 1 includes a preamble. That is, the terminal device can use the spatial filter corresponding to the SRS to complete the sending of Message 1 in the PRACH procedure.

[0458] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1.

[0459] When the spatial filter is a specified spatial filter and the spatial filter is a received synchronization signal block, it is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power, or the spatial filter is a spatial filter in a preset combination of spatial filters, and the preset combination of spatial filters includes multiple spatial filters.

[0460] In this embodiment, the spatial filter used by the terminal device when sending Message 1 to the first network device may be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1. Alternatively, the spatial filter used by the terminal device when sending Message 1 to the first network device may be a fixed spatial filter; for example, when the spatial filter used by the terminal device when sending Message 1 to the first network device is a received synchronization signal block (SSB), it is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power (RSRP). Alternatively, the spatial filter used by the terminal device when sending Message 1 to the first network device may be a spatial filter in a preset combination of spatial filters, and the preset combination of spatial filters includes multiple spatial filters; for example, the spatial filter used by the terminal device when sending Message 1 to the first network device is a spatial filter in a preset group of spatial filters.

[0461] Thus, multiple selection methods for spatial filters are provided. The spatial filter used by the terminal device when sending Message 1 to the first network device may be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1, or a fixed spatial filter, or a spatial filter in a preset group of spatial filters. Furthermore, it is convenient for the terminal device to send messages in the random access process to the first network device based on the spatial filter.

[0462] In this embodiment, priority can be given to using the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1.

[0463] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0464] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information.

[0465] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0466] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0467] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information for the channel sounding reference signal.

[0468] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes a plurality of channel sounding reference signals.

[0469] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals.

[0470] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool.

[0471] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0472] In this embodiment, the spatial filter used may be the spatial filter for transmitting the channel sounding reference signal (SRS) included in the uplink transmission indication status information (UL TCI state). At this time, there is no downlink communication link between the first network device and the terminal device, and the first network device cannot send a downlink signal to the terminal device.

[0473] Alternatively, the spatial filter used may be the spatial filter for receiving the synchronization signal block (SSB) included in the uplink transmission indication status information (UL TCI state). At this time, there may be a downlink communication link between the first network device and the terminal device, and the first network device can send a downlink signal to the terminal device.

[0474] Alternatively, the spatial filter used may be the spatial filter for receiving the synchronization signal block (SSB) included in the joint transmission indication status information (joint TCI state). At this time, there may be a downlink communication link between the first network device and the terminal device, and the first network device can send a downlink signal to the terminal device.

[0475] Alternatively, for the scenario where SRS does not follow the unified transmission indication status information (SRS does not follow unified TCI state), but SRS-TCI-State-r17 is configured, the spatial filter used can be the spatial filter indicated by the transmission indication status information (srs-TCI-State-r17) of the channel sounding reference signal.

[0476] Alternatively, the spatial filter used can be the spatial filter indicated by the uplink transmission indication status information (UL TCI state) corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set (SRS resource set); the channel sounding reference signal set (SRS resource set) includes multiple channel sounding reference signals.

[0477] Alternatively, the spatial filter used can be a predefined spatial filter. For example, for the scenario where SRS does not follow the unified transmission indication status information (SRS does not follow unified TCI state) and SRS-TCI-State-r17 is not configured for this SRS, the terminal device uses the spatial filter corresponding to the predefined SRS.

[0478] For "the spatial filter used can be a predefined spatial filter", the following situations can be included:

[0479] The spatial filter used can be the spatial filter indicated by the transmission indication status information (TCI state) with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool (joint TCI state pool). The joint transmission indication status information pool (joint TCI state pool) is pre-configured for the terminal device; or the joint transmission indication status information pool (joint TCI state pool) is activated through a MAC CE message.

[0480] Alternatively, the spatial filter used can be the spatial filter indicated by the transmission indication status information (TCI state) with the smallest identifier in the status information pool, where the status information pool is an uplink transmission indication status information pool (UL TCI state pool). The uplink transmission indication status information pool (UL TCI state pool) is pre-configured for the terminal device; or the uplink transmission indication status information pool (UL TCI state pool) is activated through a MAC CE message.

[0481] Alternatively, the spatial filter used may be the spatial filter indicated by the unified transmission indication status information (unified TCI state) last sent by the second network device.

[0482] Alternatively, the spatial filter used may be the spatial filter indicated by the uplink transmission indication status information (UL TCI state) last sent by the second network device.

[0483] In this embodiment, any one of the above-mentioned spatial filters may be considered for use.

[0484] In addition, the spatial filter used may also be the spatial filter indicated by the transmission indication status information (TCI state) corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set (SRS resourceset).

[0485] Thus, in this embodiment, multiple selection methods for the spatial filter are provided, facilitating the terminal device to send messages during the random access process to the first network device based on the spatial filter, and further enabling the terminal device to obtain the TA.

[0486] In an alternative embodiment, before step 201, the following steps are further included: The terminal device receives first indication information sent by the second network device; where the first indication information is used to indicate the channel sounding reference signal associated with Message 1.

[0487] In one example, the implementation of "the terminal device receives first indication information sent by the second network device" is as follows:

[0488] The terminal device receives first downlink control information sent by the second network device; where the first downlink control information includes the first indication information.

[0489] Alternatively, the terminal device receives a first radio resource control message sent by the second network device; where the first radio resource control message includes the first indication information.

[0490] Alternatively, the terminal device receives a first media access control message sent by the second network device; where the first media access control message includes the first indication information.

[0491] In this embodiment, there is an uplink communication link and a downlink communication link between the terminal device and the second network device, but there is only an uplink communication link and no downlink communication link between the terminal device and the second network device.

[0492] In the above step S201, the spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS). Further, the terminal device can use the spatial filter corresponding to the SRS to send Message 1 to the first network device, where Message 1 includes a preamble. That is, the terminal device can use the spatial filter corresponding to the SRS to complete the sending of Message 1 in the PRACH procedure.

[0493] It can be seen that since the spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS), the terminal device needs to obtain the SRS associated with Message 1.

[0494] Therefore, the second network device needs to send the first indication information to the terminal device, and the first indication information is used to indicate the SRS associated with Message 1. Further, the terminal device can determine the SRS associated with Message 1 according to the first indication information, and further can determine that the spatial filter (i.e., beam) used when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS).

[0495] Among them, the first indication information can be carried by the following messages: the first downlink control information (PDCCH order information), the first radio resource control (RRC) message, and the first medium access control (MAC CE) message. Further, the second network device can inform the terminal device of the first indication information in various ways, so that the terminal device can determine the SRS associated with Message 1, and further can determine that the spatial filter (i.e., beam) used when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS).

[0496] It can be seen that the second network device needs to send the first downlink control information (i.e., PDCCH order information) to the terminal device, and the PDCCH order information includes the first indication information. Or, the second network device needs to send the first radio resource control message to the terminal device, and the first radio resource control message includes the first indication information. Or, the second network device needs to send the first medium access control message to the terminal device, and the first medium access control message includes the first indication information.

[0497] In one way, since the spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS), the terminal device needs to obtain the SRS associated with Message 1; further, an association between the SRS and Message 1 needs to be established, and this association relationship can be indicated by the second network device to the terminal device.

[0498] For example, a second network device sends first downlink control information (i.e., PDCCH order information) to a terminal device. The PDCCH order information has a first indication information as an SRS ID indicator. The first indication information indicates SRS. Then, after the terminal device receives the PDCCH order information sent by the second network device, the terminal device sends a Message 1 to the first network device according to the spatial filter of SRS indicated by the first indication information (SRS ID indicator) in the PDCCH order information.

[0499] In another way, since the spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is a spatial filter corresponding to the sounding reference signal (SRS) of the channel, the terminal device needs to obtain the SRS associated with Message 1; and then the second network device needs to indicate to the terminal device which SRS spatial filter to use.

[0500] For example, a second network device sends a first RRC message to a terminal device. The first RRC message has a first indication information, and the first indication information indicates the SRS associated with Message 1. Then, after the terminal device receives the first RRC message sent by the second network device, the terminal device sends a Message 1 to the first network device according to the spatial filter of SRS indicated by the first indication information in the first RRC message.

[0501] Alternatively, a second network device sends a first MAC CE message to a terminal device. The first MAC CE message has a first indication information, and the first indication information indicates the SRS associated with Message 1. Then, after the terminal device receives the first MAC CE message sent by the second network device, the terminal device sends a Message 1 to the first network device according to the spatial filter of SRS indicated by the first indication information in the first MAC CE message.

[0502] In an optional embodiment, the transmission power of sending Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, a second preset power; where the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only reception point.

[0503] The path loss power of the uplink-only reception point is the difference between the reception power configured for the sounding reference signal and the transmission power configured for the sounding reference signal; or, the path loss power of the uplink-only reception point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0504] In an optional embodiment, before step 201, the following steps are further included: The terminal device receives fifth indication information sent by a second network device; wherein, the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink received signal power difference.

[0505] In one example, the implementation manner of "receiving the fifth indication information sent by the second network device" is as follows:

[0506] Receive the second downlink control information sent by the second network device; wherein, the fifth indication information is included in the second downlink control information.

[0507] Or, receive the high-layer signaling sent by the second network device; wherein, the fifth indication information is included in the high-layer signaling.

[0508] In this embodiment, when the terminal device sends Message 1 to the first network device, it is also necessary to determine the transmission power for sending Message 1. Furthermore, the terminal device sends Message 1 to the first network device according to the transmission power of sending Message 1 and the spatial filter.

[0509] Wherein, the transmission power of sending Message 1 is the minimum value of the following powers: the maximum transmission power of the terminal device, a second preset power; wherein, the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only receiving point. Wherein, the path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal. The path loss power of the uplink-only receiving point needs to be indicated by the second network device to the terminal device.

[0510] For example, the transmission power of sending Message 1 is P PRACH,b,f,c = min{P CMAX,f,c (i), P PRACH,target,f,c + PL b,f,c,uplink}. Wherein, P CMAX,f,c (i) is the maximum transmission power of the terminal device. P PRACH,target,f,c is the target reception power of Message 1. PL b,f,c,uplink is the path loss power of the uplink-only receiving point (uplink-only-TRP). PL b,f,c,uplink can be determined through the uplink reference signal (such as SRS). b represents the bandwidth; f represents the frequency band; c represents the CC. i represents the i-th transmission occasion.

[0511] Wherein, the path loss power PL b,f,c,uplink= SRS-RSRP – SRS_configured_power. Wherein, SRS_configured_power is the transmission power configured for the sounding reference signal (SRS). SRS-RSRP is the received power configured for the sounding reference signal (SRS), that is, SRS-RSRP is the received power of the SRS when the transmission power of the SRS is SRS_configured_power. Wherein, the path loss power PL of the uplink-only receiving point b,f,c,uplink After being calculated by the second network device, the second network device indicates the path loss power of the uplink-only receiving point to the terminal device.

[0512] Alternatively, the transmission power of the transmitted message 1 is the minimum value among the following powers: the maximum transmission power of the terminal device, the second preset power; wherein, the second preset power is the sum of the target received power of the message 1 and the path loss power of the uplink-only receiving point. Wherein, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink received signal power difference, and the uplink received signal power difference is the difference between the uplink received signal power of the first network device and the uplink received signal power of the second network device. The uplink received signal power difference needs to be indicated by the second network device to the terminal device.

[0513] For example, the transmission power of the transmitted message 1 is P PRACH,b,f,c = min{P CMAX,f,c (i), P PRACH,target,f,c + PL b,f,c,uplink}. Wherein, P CMAX,f,c (i) is the maximum transmission power of the terminal device. P PRACH,target,f,c is the target received power of the message 1. PL b,f,c,uplink is the path loss power of the uplink-only receiving point (uplink-only-TRP), b represents the bandwidth; f represents the frequency band; c represents the CC. i represents the i-th transmission occasion.

[0514] Wherein, the path loss power PL of the uplink-only receiving point b,f,c,uplink = PL1 + delta uplink_pathloss . Wherein, PL1 is the downlink path loss power of the second network device estimated by the terminal device. delta uplink_pathloss is the uplink received signal power difference, and the uplink received signal power difference delta uplink_pathloss is the difference between the uplink received signal power of the first network device and the uplink received signal power of the second network device. For example, it is the uplink received signal power of the first network device minus the uplink received signal power of the second network device, or the uplink received signal power of the second network device minus the uplink received signal power of the first network device. If delta uplink_pathlossThe value being 0 indicates that the terminal device directly uses the downlink path loss power of the second network device as the downlink path loss power of the first network device. Among them, the uplink received signal power difference delta uplink_pathloss After being calculated by the second network device, the second network device indicates the path loss power of the row-only receiving point to the terminal device.

[0515] Alternatively, the transmission power of sending Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, the second preset power; where the second preset power is the sum of the target receiving power of Message 1 and the path loss power of the uplink-only receiving point. Among them, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the second network device and the path loss offset power between the first network device and the second network device.

[0516] For example, the transmission power of sending Message 1 is P PRACH,b,f,c =min{P CMAX,f,c (i),P PRACH,target,f,c +PL b,f,c,uplink}. Among them, P CMAX,f,c (i) is the maximum transmission power of the terminal device. P PRACH,target,f,c is the target receiving power of Message 1. PL b,f,c,uplink is the path loss power of the uplink-only receiving point (uplink-only-TRP). b represents the bandwidth; f represents the frequency band; c represents the CC. i represents the i-th transmission occasion.

[0517] Among them, the path loss power of the uplink-only receiving point PL b,f,c,uplink =PL1+PL offset . Among them, PL1 is the downlink path loss power of the second network device estimated by the terminal device. PL offset is the path loss offset power between the first network device and the second network device.

[0518] In one example, the path loss offset power can be indicated to the terminal device by at least one of the first network device or the second network device. Specifically, the first network device or the second network device can send the path loss offset power between the first network device and the second network device to the terminal device through a Radio Resource Control (RRC) message.

[0519] In another example, the path loss offset power between the first network device and the second network device can be indicated through a status information pool, where the status information pool is a joint transmission indication status information pool (joint TCI state pool) or an uplink transmission indication status information pool (UL TCI state pool). Among them, the status information pool is pre-configured for the terminal device; or, the status information pool is activated through a MAC CE message.

[0520] Therefore, the terminal device can determine the transmission power of Message 1 based on the above parameters. Furthermore, the terminal device sends Message 1 to the first network device according to the transmission power of sending Message 1 and the spatial filter.

[0521] It can be known that the second network device needs to send the path loss power of the uplink-only receiving point or the uplink received signal power difference to the terminal device in advance. The second network device can send the fifth indication information to the terminal device; wherein, the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink received signal power difference. Therefore, the terminal device determines the transmission power of Message 1 based on the path loss power of the uplink-only receiving point to send Message 1 to the first network device. Or, the terminal device determines the transmission power of Message 1 based on the uplink received signal power difference to send Message 1 to the first network device.

[0522] The fifth indication information can be a separate signaling, or the fifth indication information is carried by a high-layer signaling, or the fifth indication information is carried by downlink control information.

[0523] Therefore, the second network device sends the second downlink control information to the terminal device; wherein, the second downlink control information includes the fifth indication information. Or, the second network device sends a high-layer signaling to the terminal device; wherein, the high-layer signaling includes the fifth indication information, and the high-layer signaling is, for example, an RRC message.

[0524] Therefore, by providing multiple indication methods for indicating the path loss power of the uplink-only receiving point or the uplink received signal power difference, the fifth indication information can be a separate signaling, or the fifth indication information is carried by a high-layer signaling, or the fifth indication information is carried by downlink control information. So that the terminal device can determine the transmission power of Message 1 based on the path loss power of the uplink-only receiving point or the uplink received signal power difference to send Message 1 to the first network device.

[0525] Step 202: The terminal device receives the response message sent by the second network device; wherein, the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0526] In this embodiment, after the first network device receives Message 1 sent by the terminal device, the first network device determines the TA according to the preamble in Message 1. Then, the first network device sends a response message to the second network device, and the response message includes the TA. The second network device sends the response message carrying the TA to the terminal device.

[0527] Furthermore, the terminal device obtains the TA.

[0528] In this embodiment, the terminal device sends Message 1 to the first network device based on a spatial filter, where Message 1 includes a preamble; the spatial filter is the spatial filter corresponding to the channel sounding reference signal. Further, the spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS). For the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used when sending Message 1 in the random access process to the network device can be determined, so that the terminal device can send Message 1 in the random access process to the network device. Then, the first network device feeds back a response message carrying the TA to the terminal device through the second network device. Thus, the terminal device can obtain the TA. In addition, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used when sending Message 1 in the random access process to the network device and the transmission power used when sending the message in the random access process to the network device are determined; so that the terminal device can send Message 1 in the random access process to the network device and the terminal device can obtain the TA.

[0529] Figure 3 is a schematic flowchart of a method for obtaining timing advance provided by an embodiment of the present application, as Figure 3As shown in the figure, an embodiment of the present application provides a method for obtaining timing advance. This method can be applied to a terminal device in the 5G system structure as described above to achieve, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, determining the spatial filter used when sending a message in the random access process to the network device, so that the terminal device can send a message in the random access process to the network device and the terminal device can obtain TA; it can also be achieved for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, determining the spatial filter used when sending a message in the random access process to the network device and the transmission power used when sending a message in the random access process to the network device; so that the terminal device can send a message in the random access process to the network device and the terminal device can obtain TA. The method provided in this embodiment includes the following steps:

[0530] Step 301: The terminal device sends Message 1 to the first network device based on a spatial filter, where Message 1 includes a preamble, and the preamble is used to determine the timing advance. The spatial filter is a specified spatial filter.

[0531] In this step, there is an uplink communication link and a downlink communication link between the terminal device and the second network device, but there is only an uplink communication link between the terminal device and the second network device, and there is no downlink communication link.

[0532] The spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is a specified spatial filter. Furthermore, the terminal device can use the specified spatial filter to send Message 1 to the first network device, where Message 1 includes a preamble. That is, the terminal device can use the specified spatial filter to complete the sending of Message 1 in the PRACH process.

[0533] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1.

[0534] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal reception power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0535] In this embodiment, the spatial filter used by the terminal device to send Message 1 to the first network device may be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1. Alternatively, the spatial filter used by the terminal device to send Message 1 to the first network device may be a fixed spatial filter; for example, the spatial filter used by the terminal device to send Message 1 to the first network device is the spatial filter corresponding to the synchronization signal block (SSB) with the optimal reference signal received power (RSRP) when receiving the synchronization signal block. Alternatively, the spatial filter used by the terminal device to send Message 1 to the first network device may be the spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters; for example, the spatial filter used by the terminal device to send Message 1 to the first network device is the spatial filter in a preset group of spatial filters.

[0536] Thus, by providing multiple selection methods for the spatial filter, the spatial filter used by the terminal device to send Message 1 to the first network device may be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1, or a fixed spatial filter, or the spatial filter in a preset group of spatial filters. Furthermore, it is convenient for the terminal device to send messages in the random access process to the first network device based on the spatial filter.

[0537] In this embodiment, it is possible to give priority to using a specified spatial filter.

[0538] This embodiment is directed to the scenario of RACH-based TA acquisition.

[0539] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0540] The spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information.

[0541] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0542] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0543] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0544] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals.

[0545] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals.

[0546] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool.

[0547] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0548] In this embodiment, for the spatial filter, refer to Figure 2 the description of the embodiment shown.

[0549] In an alternative embodiment, before step 301, the following steps are further included: The terminal device receives second indication information sent by the second network device; the second indication information is used to indicate the number of repetitions of message 1.

[0550] In one example, the implementation manner of "the terminal device receives second indication information sent by the second network device" is as follows:

[0551] The terminal device receives a second radio resource control message sent by the second network device; the second radio resource control message includes the second indication information.

[0552] Alternatively, the terminal device receives a second media access control message sent by the second network device; the second media access control message includes the second indication information.

[0553] In this embodiment, there is an uplink communication link and a downlink communication link between the terminal device and the second network device, but there is only an uplink communication link between the terminal device and the second network device, and there is no downlink communication link.

[0554] In the above step S201, the spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is a specified spatial filter. Further, the terminal device can use the specified spatial filter to send Message 1 to the first network device, where Message 1 includes a preamble. That is, the terminal device can use the specified spatial filter to complete the sending of Message 1 in the PRACH procedure.

[0555] Among them, the transmission direction of the specified spatial filter is determined by the terminal device itself. The specified spatial filter can be the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power (RSRP) when receiving the synchronization signal block (SSB). The terminal device uses a fixed spatial filter (for example, the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power) to send Message 1 to the first network device.

[0556] This embodiment is directed to the scenario of RACH-based TA acquisition.

[0557] Figure 4 Schematic of the spatial filter provided by this application Figure 1 , as Figure 4 shown, the terminal device uses a fixed spatial filter (for example, the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power) to send Message 1 to the first network device. The fixed spatial filter is, as Figure 4 shown, the black beam.

[0558] Moreover, the second network device needs to indicate the number of repeated transmissions of Message 1. The second network device sends second indication information to the terminal device, and the second indication information is used to indicate the number of repeated (repetition) transmissions of Message 1. Further, the terminal device uses the fixed spatial filter to send Message 1 to the first network device based on the number of repeated (repetition) transmissions indicated by the second indication information.

[0559] Among them, the second indication information can be carried by the following messages: the second radio resource control (RRC) message, the second media access control (MAC CE) message. Further, the second network device can inform the terminal device of the second indication information in various ways, so that the terminal device uses the fixed spatial filter to send Message 1 to the first network device based on the number of repeated (repetition) transmissions indicated by the second indication information.

[0560] For example, the second network device needs to send a second radio resource control message to the terminal device; among them, the second radio resource control message includes the second indication information. Or, the second network device needs to send a second media access control message to the terminal device; among them, the second media access control message includes the second indication information.

[0561] In an optional embodiment, the transmission power of Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, and the second preset power; where the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only receiving point.

[0562] For example, the path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, where the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device; or, the sum of the downlink path loss power of the first network device and the path loss offset power between the first network device and the second network device.

[0563] In an optional embodiment, before step 201, the following steps are further included: the terminal device receives fifth indication information sent by the second network device; where the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0564] In an example, the implementation manner of "the terminal device receives fifth indication information sent by the second network device" is as follows:

[0565] The terminal device receives second downlink control information sent by the second network device; where the second downlink control information includes the fifth indication information.

[0566] Or, the terminal device receives high-layer signaling sent by the second network device; where the high-layer signaling includes the fifth indication information.

[0567] In this embodiment, for the transmission power of Message 1, refer to Figure 2 the introduction of the embodiment shown.

[0568] Step 302: The terminal device receives a response message sent by the second network device; where the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0569] In this embodiment, the first network device receives Message 1 sent by the terminal device based on different spatial filters. Then, the first network device determines the TA according to the preamble in Message 1. Then, the first network device sends a response message to the second network device, and the response message includes the TA. The second network device sends the response message carrying the TA to the terminal device.

[0570] Furthermore, the terminal device obtains the TA.

[0571] In this embodiment, the terminal device sends Message 1 to the first network device based on a spatial filter, where Message 1 includes a preamble; the spatial filter is a specified filter. Furthermore, the spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is a fixed filter. For the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used when sending Message 1 in the random access process to the network device can be determined, so that the terminal device can send Message 1 in the random access process to the network device. Then, the first network device feeds back a response message carrying the TA to the terminal device through the second network device. Thus, the terminal device can obtain the TA. In addition, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used when sending Message 1 in the random access process to the network device and the transmission power used when sending the message in the random access process to the network device are determined; so that the terminal device can send Message 1 in the random access process to the network device and the terminal device can obtain the TA.

[0572] Figure 5 A flowchart of a method for obtaining a timing advance provided by an embodiment of this application is shown in Figure 5As shown in the figure, an embodiment of the present application provides a method for obtaining a timing advance, which can be applied to a terminal device in the 5G system structure as described above, so as to implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determine the spatial filter used when sending a message in the random access process to the network device, so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain the TA; it can also implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determine the spatial filter used when sending a message in the random access process to the network device and the transmission power used when sending a message in the random access process to the network device; so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain the TA. The method provided in this embodiment includes the following steps:

[0573] Step 501: The terminal device sends Message 1 to the first network device based on a spatial filter, where Message 1 includes a preamble, and the preamble is used to determine the timing advance. The spatial filter is a specified spatial filter.

[0574] In this step, there is an uplink communication link and a downlink communication link between the terminal device and the second network device, but there is only an uplink communication link and no downlink communication link between the terminal device and the second network device.

[0575] The spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is a specified spatial filter. In this embodiment, the spatial filter used by the terminal device when sending Message 1 to the first network device is a spatial filter in a preset spatial filter combination, where the preset spatial filter combination includes multiple spatial filters; for example, the spatial filter used by the terminal device when sending Message 1 to the first network device is a spatial filter in a preset group of spatial filters.

[0576] Furthermore, the terminal device can use the spatial filter in the preset spatial filter combination to send Message 1 to the first network device, where Message 1 includes a preamble. That is, the terminal device can use the specified spatial filter to complete the sending of Message 1 in the PRACH process.

[0577] This embodiment is directed to the scenario of RACH-based TA acquisition.

[0578] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1.

[0579] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0580] In this embodiment, the spatial filter used by the terminal device to send Message 1 to the first network device may be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1. Alternatively, the spatial filter used by the terminal device to send Message 1 to the first network device may be a fixed spatial filter; for example, the spatial filter used by the terminal device to send Message 1 to the first network device is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power (RSRP) when receiving the synchronization signal block (SSB). Alternatively, the spatial filter used by the terminal device to send Message 1 to the first network device may be a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters; for example, the spatial filter used by the terminal device to send Message 1 to the first network device is a spatial filter in a preset group of spatial filters.

[0581] Thus, multiple selection methods of spatial filters are provided. The spatial filter used by the terminal device to send Message 1 to the first network device may be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1, or a fixed spatial filter, or a spatial filter in a preset group of spatial filters. Furthermore, it is convenient for the terminal device to send messages in the random access process to the first network device based on the spatial filter.

[0582] In this embodiment, for the transmission power of sending Message 1, refer to Figure 2 the description of the embodiments shown. In this embodiment, it may be preferably considered to use a preset spatial filter combination that includes multiple spatial filters. Thus, the first network device sends Message 1 in the random access process to the first network device based on each spatial filter in a group of spatial filters.

[0583] Figure 6 Schematic diagram of the spatial filter provided by this application Figure 2 As Figure 6 shown, the terminal device uses each spatial filter in a group of spatial filters to send Message 1 in the random access process to the first network device. AsFigure 6 As shown, each spatial filter in the above-mentioned set of spatial filters is transmitted on time slots slot n, slot n+1, slot n+2, …, slot n+m; both n and m are positive integers greater than or equal to 1.

[0584] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0585] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information.

[0586] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0587] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0588] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0589] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals.

[0590] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals.

[0591] Or, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is the joint transmission indication status information pool, or the status information pool is the uplink transmission indication status information pool.

[0592] Or, the spatial filter is the spatial filter indicated by the unified transmission indication status information last sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information last sent by the second network device.

[0593] In this embodiment, for the spatial filter, refer to Figure 2 the description of the shown embodiment.

[0594] In an optional embodiment, the transmission power of Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, and the second preset power; where the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only receiving point.

[0595] For example, the path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, where the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device; or, the sum of the downlink path loss power of the first network device and the path loss offset power between the first network device and the second network device.

[0596] In an optional embodiment, before step 501, the following steps are further included: the terminal device receives fifth indication information sent by the second network device; where the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0597] In one example, the implementation manner of "the terminal device receives fifth indication information sent by the second network device" is as follows:

[0598] The terminal device receives second downlink control information sent by the second network device; where the second downlink control information includes the fifth indication information.

[0599] Or, the terminal device receives high-layer signaling sent by the second network device; where the high-layer signaling includes the fifth indication information.

[0600] In this embodiment, for the transmission power of Message 1, refer to Figure 2 the introduction of the shown embodiment.

[0601] Step 502: The terminal device receives a response message sent by the second network device; where the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0602] In this embodiment, the terminal device sends Message 1 in the random access procedure to the first network device based on each spatial filter in a set of spatial filters.

[0603] The first network device uses a certain spatial filter to receive Message 1 sent by the terminal device. The first network device determines the TA according to the preamble in Message 1. Then, the first network device sends a response message to the second network device, and the response message includes the TA. The second network device sends the response message carrying the TA to the terminal device.

[0604] Furthermore, the terminal device obtains the TA.

[0605] Step 503: The terminal device receives sixth indication information sent by the second network device; wherein, the sixth indication information is used to indicate the space filter with the optimal performance; the terminal device sends Message 3 to the first network device based on the space filter indicated by the sixth indication information.

[0606] In this embodiment, after "the terminal device sends Message 1 in the random access procedure to the first network device based on each space filter in a set of space filters. The first network device uses a certain space filter to receive Message 1 sent by the terminal device.", the first network device determines the space filter with the optimal performance in the above-mentioned "set of space filters". Then, the first network device sends the sixth indication information to the terminal device through the second network device; wherein, the sixth indication information is used to indicate the space filter with the optimal performance. For example, the first network device sends a RAR MAC PDU message through the second network device, and the RAR MAC PDU message includes the sixth indication information.

[0607] Thus, the terminal device sends Message 3 to the first network device based on the space filter indicated by the sixth indication information.

[0608] Thus, the first network device sends the sixth indication information to the terminal device through the second network device; wherein, the sixth indication information is used to indicate the space filter with the optimal performance; it is convenient for the terminal device to directly determine the space filter with the optimal performance, and the terminal device sends Message 3 in the random access procedure to the first network device based on the space filter with the optimal performance.

[0609] In this embodiment, the terminal device sends Message 1 to the first network device based on a spatial filter, where Message 1 includes a preamble; the spatial filter is a spatial filter in a set of spatial filters. Furthermore, the spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is a spatial filter in a set of spatial filters. For the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used when sending Message 1 in the random access procedure to the network device can be determined, so that the terminal device can send Message 1 in the random access procedure to the network device. Then, the first network device feeds back a response message carrying the TA to the terminal device through the second network device. Thus, the terminal device can obtain the TA. In addition, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used when sending Message 1 in the random access procedure to the network device and the transmission power used when sending the message in the random access procedure to the network device are determined; so that the terminal device can send Message 1 in the random access procedure to the network device and the terminal device can obtain the TA.

[0610] Figure 7 Schematic flow diagram of a method for obtaining timing advance provided by an embodiment of the present application, as Figure 7As shown in the figure, an embodiment of the present application provides a method for obtaining a timing advance. This method can be applied to a terminal device in the 5G system architecture as described above, so as to implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determining the spatial filter used when sending a message in the random access process to the network device, so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain the TA; it can also be implemented for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determining the spatial filter used when sending a message in the random access process to the network device and determining the transmission power used when sending a message in the random access process to the network device; so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain the TA. The method provided in this embodiment includes the following steps:

[0611] Step 701: The terminal device sends a channel sounding reference signal to the first network device based on a spatial filter, where the channel sounding reference signal is used to determine the timing advance. Among them, the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter.

[0612] In this step, there is an uplink communication link and a downlink communication link between the terminal device and the second network device, but there is only an uplink communication link between the terminal device and the second network device, and there is no downlink communication link.

[0613] The spatial filter (i.e., beam) used by the terminal device when sending a channel sounding reference signal (SRS) to the first network device is the spatial filter corresponding to the channel sounding reference signal (SRS). Furthermore, the terminal device can use the spatial filter corresponding to the SRS to send the SRS to the first network device, where the SRS includes a preamble. That is, the terminal device can use the spatial filter corresponding to the SRS to complete the sending of the SRS in the PRACH process.

[0614] Alternatively, the spatial filter (i.e., beam) used by the terminal device when sending a channel sounding reference signal (SRS) to the first network device is a specified spatial filter. For example, the specified spatial filter is a fixed spatial filter, or the specified spatial filter is a spatial filter in a group of spatial filters. Furthermore, the terminal device can use the specified spatial filter to send the SRS to the first network device, where the SRS includes a preamble. That is, the terminal device can use the specified spatial filter to complete the SRS transmission in the PRACH procedure.

[0615] This embodiment is directed to the scenario of RACH-less based TA acquisition.

[0616] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1.

[0617] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0618] In this embodiment, the spatial filter used by the terminal device when sending the SRS to the first network device can be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1. Or, the spatial filter used by the terminal device when sending the SRS to the first network device can be a fixed spatial filter; for example, the spatial filter used by the terminal device when sending the SRS to the first network device is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power (RSRP) when receiving the synchronization signal block (SSB). Or, the spatial filter used by the terminal device when sending the SRS to the first network device can be a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters; for example, the spatial filter used by the terminal device when sending the SRS to the first network device is a spatial filter in a preset group of spatial filters.

[0619] Thus, multiple selection methods of spatial filters are provided. The spatial filter used by the terminal device when sending the SRS to the first network device can be the spatial filter corresponding to the channel sounding reference signal (SRS) associated with Message 1, or a fixed spatial filter, or a spatial filter in a preset group of spatial filters. Furthermore, it is convenient for the terminal device to send messages in the random access procedure to the first network device based on the spatial filter.

[0620] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0621] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information.

[0622] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0623] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0624] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0625] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set; the channel sounding reference signal set includes multiple channel sounding reference signals.

[0626] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0627] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is the joint transmission indication status information pool, or the status information pool is the uplink transmission indication status information pool.

[0628] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0629] In this embodiment, for the spatial filter, reference can be made to Figure 2 for the introduction.

[0630] In addition, for the scenario of SRS resource set follow, the spatial filter used can be the spatial filter indicated by the joint transmission indication status information table (dl-OrJointTCI-StateList).

[0631] Alternatively, for the scenario where the SRS resource set follows, the spatial filter used can be the spatial filter indicated by the Transmission Indication - Uplink - State Information (TCI - UL - State).

[0632] Alternatively, for the scenario where the SRS resource set does not follow, the spatial filter used can be the spatial filter indicated by the Transmission Indication State Information (TCI state) corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set (SRS resource set); the channel sounding reference signal set (SRS resource set) includes multiple channel sounding reference signals.

[0633] Alternatively, for the scenario where the SRS resource set does not follow, the spatial filter used can be the spatial filter indicated by the Uplink Transmission Indication State Information (UL TCI state) corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set (SRS resource set); the channel sounding reference signal set (SRS resource set) includes multiple channel sounding reference signals.

[0634] In an alternative embodiment, the transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is the sum of the power value and the transmission power difference.

[0635] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by the first network device and the transmission power of the channel sounding reference signal transmitted by the second network device.

[0636] The power value represents the sum of the following information: the received power of the channel sounding reference signal, the transmission bandwidth of the channel sounding reference signal, a preset power compensation factor, the downlink path loss information, and the adjustment amount of the transmission power of the physical uplink shared channel of the terminal device.

[0637] In an alternative embodiment, before step S701, it further includes: the terminal device receives fourth indication information sent by the second network device; where the fourth indication information is used to indicate the transmission power difference.

[0638] Among them, the implementation manner of "the terminal device receives fourth indication information sent by the second network device" is as follows:

[0639] The terminal device receives first downlink control information sent by the second network device, where the first downlink control information includes the fourth indication information.

[0640] Alternatively, the terminal device receives a fourth radio resource control message sent by the second network device; wherein, the fourth radio resource control message includes fourth indication information.

[0641] Alternatively, the terminal device receives a fourth media access control message sent by the second network device; wherein, the fourth media access control message includes fourth indication information.

[0642] In this embodiment, when the terminal device sends SRS to the first network device, it also needs to determine the transmission power for sending SRS. Further, the terminal device sends SRS to the first network device according to the transmission power for sending SRS and the spatial filter.

[0643] Wherein, the transmission power for sending the channel sounding reference signal is the minimum value among the following powers: the maximum transmit power of the terminal device, the first preset power; wherein, the first preset power is the sum of the power value and the transmission power difference.

[0644] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0645] The power value represents the sum of the following information: the received power of the channel sounding reference signal, the transmission bandwidth of the channel sounding reference signal, the preset power compensation factor, the downlink path loss information, and the adjustment amount of the transmit power of the physical uplink shared channel of the terminal device.

[0646] For example, the transmission power of SRS is:

[0647]

[0648] Wherein, P CMAX,f,c (i) is the maximum transmit power of the terminal device. The power value is delta_power_offset is the transmission power difference. is the received power of the channel sounding reference signal configured by the network device. M SRS,b,f,c (i) is the transmission bandwidth of the channel sounding reference signal. α SRS,b,f,c (q s ) is the preset power compensation factor. PL b,fc (q d ) is the downlink path loss information. h b,f,c (i,l) is the adjustment amount of the transmit power of the physical uplink shared channel of the terminal device. b represents the bandwidth; f represents the frequency band; c represents the CC. i represents the i-th transmission occasion.

[0649] Therefore, the terminal device can determine the transmission power of the SRS based on the above parameters. Furthermore, the terminal device sends the SRS to the first network device according to the transmission power of the SRS and the spatial filter.

[0650] It can be seen that the second network device needs to send the transmission power difference to the terminal device in advance. The second network device can send the fourth indication information to the terminal device; wherein, the fourth indication information is used to indicate the transmission power difference. Therefore, the terminal device determines the transmission power of the SRS based on the transmission power difference to send the SRS to the first network device.

[0651] The fourth indication information can be a separate signaling, or the fourth indication information is carried by a high-layer signaling, or the fourth indication information is carried by a downlink control information.

[0652] Therefore, the second network device sends the first downlink control information to the terminal device, wherein the first downlink control information includes the fourth indication information. Or, the second network device sends the fourth radio resource control message to the terminal device; wherein, the fourth radio resource control message includes the fourth indication information. Or, the second network device sends the fourth media access control message to the terminal device; wherein, the fourth media access control message includes the fourth indication information.

[0653] Wherein, the first downlink control information can be DCI format 0_1.

[0654] Therefore, a variety of indication methods for indicating the transmission power difference are provided. The fourth indication information can be a separate signaling, or the fourth indication information is carried by a high-layer signaling, or the fourth indication information is carried by a downlink control information. So that the terminal device can determine the transmission power of the SRS based on the transmission power difference to send the SRS to the first network device.

[0655] In an optional embodiment, the configuration information of the channel sounding reference signal indicates the time-domain resource for transmitting the channel sounding reference signal.

[0656] Or, before step S701, it further includes: the terminal device receives the third indication information sent by the second network device, and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0657] In one example, the implementation manner of "the terminal device receives the third indication information sent by the second network device" is as follows:

[0658] The terminal device receives first downlink control information sent by a second network device; wherein, the first downlink control information includes third indication information; or, the first downlink control information is used to instruct the terminal device to send a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes third indication information.

[0659] Or, the terminal device receives a third radio resource control message sent by the second network device; wherein, the third radio resource control message includes third indication information.

[0660] Or, the terminal device receives a third media access control message sent by the second network device; wherein, the third media access control message includes third indication information.

[0661] In this embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for sending the channel sounding reference signal. Or, the second network device needs to send third indication information to the terminal device, and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs. Thus, the terminal device can determine the time domain resource of the SRS, or determine the cell to which the SRS belongs.

[0662] For example, for periodic SRS and semi-persistent SRS, the configuration information of the SRS indicates the time domain resource for sending the channel sounding reference signal. For example, the periodicity and offset are configured in the configuration information of the SRS, thereby indicating the time domain resource for sending the SRS.

[0663] Or, a third indication information (additional PCI index) can be added to the configuration information of the SRS, and the third indication information indicates the cell to which the SRS belongs. Thus, it corresponds to the case of an UL-only TRP scenario in another cell different from the macro station.

[0664] Or, for aperiodic SRS, the second network device sends first downlink control information (DCI format 0_1) to the terminal device, and the first downlink control information (DCI format 0_1) includes third indication information (additional PCI index / indicator).

[0665] Or, for aperiodic SRS, the second network device sends first downlink control information (DCI format 0_1) to the terminal device, and the first downlink control information (DCI format 0_1) is used to instruct the terminal device to send a channel sounding reference signal to the first network device, and the channel sounding reference signal to be sent to the first network device includes third indication information (additional PCI index / indicator).

[0666] Alternatively, for an aperiodic SRS, the second network device sends a third radio resource control message to the terminal device; wherein, the third radio resource control message includes third indication information.

[0667] Alternatively, for an aperiodic SRS, the second network device sends a third media access control (MAC CE) message to the terminal device; wherein, the third media access control message includes third indication information. Moreover, the third media access control message includes aperiodicSRS-ResourceTrigger / SRS-ResourceSet.

[0668] Thus, the third indication information is indicated in multiple ways, enabling the terminal device to determine the cell to which the SRS belongs.

[0669] Step 702: The terminal device receives a response message sent by the second network device; wherein, the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0670] In this embodiment, after the terminal device sends an SRS to the first network device, the first network device determines the TA based on the SRS. Then, the first network device sends a response message to the second network device, and the response message includes the TA. The second network device sends the response message carrying the TA to the terminal device.

[0671] Furthermore, the terminal device obtains the TA.

[0672] In this embodiment, the terminal device sends the SRS to the first network device based on a spatial filter, where the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter. For the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used for sending the SRS in the random access process to the network device can be determined, so that the terminal device can send the SRS in the random access process to the network device. Then, the first network device feeds back a response message carrying the TA to the terminal device through the second network device. Thus, the terminal device can obtain the TA. In addition, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, the spatial filter used for sending the SRS in the random access process to the network device and the transmission power used for sending the SRS in the random access process to the network device are determined; so that the terminal device can send the SRS in the random access process to the network device and the terminal device can obtain the TA.

[0673] Figure 8 It is a flowchart of a method for obtaining the timing advance provided in an embodiment of the present application. As Figure 8 shown, an embodiment of the present application provides a method for obtaining the timing advance. This method can be applied to the network device in the 5G system structure as described above. The network device is the first network device to implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determining the spatial filter used for sending the message in the random access process to the network device, so that the terminal device can send the message in the random access process to the network device and the terminal device can obtain the TA; and it can also be implemented for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determining the spatial filter used for sending the message in the random access process to the network device and the transmission power used for sending the message in the random access process to the network device; so that the terminal device can send the message in the random access process to the network device and the terminal device can obtain the TA. The method provided in this embodiment includes the following steps:

[0674] Step 801: The first network device receives Message 1 sent by the terminal device based on a spatial filter, where Message 1 includes a preamble used to determine the timing advance; alternatively, it receives the channel sounding reference signal sent by the terminal device based on the spatial filter, where the channel sounding reference signal is used to determine the timing advance; where the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter.

[0675] Step 802: The first network device sends a response message to the second network device; where the response message includes the timing advance and is used to feed back to the terminal device.

[0676] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1.

[0677] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0678] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0679] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information.

[0680] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0681] Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0682] Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0683] Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals.

[0684] Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals.

[0685] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool.

[0686] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0687] In an alternative embodiment, the transmission power of message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, the second preset power; where the second preset power is the sum of the target reception power of message 1 and the path loss power of the uplink-only reception point.

[0688] In this embodiment, for the transmission power of message 1, refer to Figure 2 the description of the embodiment shown.

[0689] In an alternative embodiment, the path loss power of the uplink-only reception point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only reception point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, where the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device; or, the path loss power of the uplink-only reception point is the sum of the downlink path loss power of the second network device and the path loss offset power between the first network device and the second network device.

[0690] In an alternative embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is the sum of the power value and the transmission power difference.

[0691] The transmission power difference is the difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0692] The power value represents the sum of the following information: the reception power of the channel sounding reference signal, the transmission bandwidth of the channel sounding reference signal, a preset power compensation factor, downlink path loss information, and the adjustment amount of the transmission power of the physical uplink shared channel of the terminal device.

[0693] For the detailed content of the above method, reference can be made to the description of the corresponding method embodiment in the foregoing embodiment. The implementation principle and technical effect are similar, and will not be elaborated here in this embodiment.

[0694] Figure 9 The flowchart of the method for obtaining the timing advance provided by an embodiment of the present application is as follows Figure 9 As shown, an embodiment of the present application provides a method for obtaining a timing advance. This method can be applied to a network device in the 5G system structure as described above. The network device is a second network device to implement the UL-only TRP scenario (S-DCI based multi-TRP transmission). When there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determine the spatial filter used when sending a message in the random access process to the network device, so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain the TA; it can also be implemented for the UL-only TRP scenario (S-DCI based multi-TRP transmission). When there is no downlink communication link between the network device and the terminal device, during the process of obtaining the TA, determine the spatial filter used when sending a message in the random access process to the network device and the transmission power used when sending a message in the random access process to the network device; so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain the TA. The method provided in this embodiment includes the following steps:

[0695] Step 901, the second network device sends first indication information to the terminal device; wherein, the first indication information is used to indicate a channel sounding reference signal associated with Message 1.

[0696] Wherein, the first indication information is used to send Message 1 to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information. Message 1 includes a preamble, and the preamble is used to determine the timing advance; or, the first indication information is used to send a sounding reference signal to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, and the channel sounding reference signal is used to determine the timing advance; or, the spatial filter is a specified spatial filter.

[0697] Step 902, the second network device receives the response message sent by the first network device and sends the response message to the terminal device; wherein, the response message includes the timing advance.

[0698] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1.

[0699] When the spatial filter is a specified spatial filter and the spatial filter is a received synchronization signal block, it is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0700] In an optional embodiment, the method provided in this embodiment further includes:

[0701] Sending first indication information to the terminal device; wherein, the first indication information is used to indicate the channel sounding reference signal associated with Message 1.

[0702] In an optional embodiment, sending the first indication information to the terminal device includes:

[0703] Sending a first downlink control information to the terminal device; wherein, the first indication information is included in the first downlink control information; or, sending a first radio resource control message to the terminal device; wherein, the first indication information is included in the first radio resource control message; or, sending a first media access control message to the terminal device; wherein, the first indication information is included in the first media access control message.

[0704] In an optional embodiment, the method provided in this embodiment further includes:

[0705] Sending second indication information to the terminal device; wherein, the second indication information is used to indicate the number of repetitions of Message 1.

[0706] In an optional embodiment, sending the second indication information to the terminal device includes:

[0707] Sending a second radio resource control message to the terminal device; wherein, the second indication information is included in the second radio resource control message; or, sending a second media access control message to the terminal device; wherein, the second indication information is included in the second media access control message.

[0708] In an optional embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for sending the channel sounding reference signal.

[0709] Alternatively, the method provided in this embodiment further includes: sending third indication information to the terminal device, and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0710] In an optional embodiment, sending the third indication information to the terminal device includes:

[0711] Send first downlink control information to a terminal device; wherein, the first downlink control information includes third indication information; alternatively, the first downlink control information is used to instruct the terminal device to send a channel sounding reference signal, and the channel sounding reference signal to be sent to a first network device includes third indication information.

[0712] Alternatively, send a third radio resource control message to the terminal device; wherein, the third radio resource control message includes third indication information.

[0713] Alternatively, send a third media access control message to the terminal device; wherein, the third media access control message includes third indication information.

[0714] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0715] The spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information.

[0716] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0717] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0718] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0719] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set; the channel sounding reference signal set includes multiple channel sounding reference signals.

[0720] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0721] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool.

[0722] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0723] In an optional embodiment, the transmission power of Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, and a second preset power; wherein, the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only receiving point.

[0724] In this embodiment, for the transmission power of Message 1, refer to Figure 2 the introduction of the embodiment shown.

[0725] For example, the path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, where the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the second network device and the path loss offset power between the first network device and the second network device.

[0726] In an optional embodiment, the method provided in this embodiment further includes:

[0727] sending fifth indication information to the terminal device; wherein, the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0728] In an optional embodiment, sending the fifth indication information to the terminal device includes:

[0729] sending second downlink control information to the terminal device; wherein, the second downlink control information includes the fifth indication information.

[0730] Or, sending high-layer signaling to the terminal device; wherein, the high-layer signaling includes the fifth indication information.

[0731] In an optional embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, and a first preset power; the first preset power is the sum of a power value and a transmission power difference.

[0732] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0733] The power value represents the sum of the following information: the reception power of the channel sounding reference signal, the transmission bandwidth of the channel sounding reference signal, a preset power compensation factor, downlink path loss information, and the adjustment amount of the transmission power of the physical uplink shared channel of the terminal device.

[0734] In an alternative embodiment, the method provided in this embodiment further includes:

[0735] Sending fourth indication information to the terminal device; wherein, the fourth indication information is used to indicate a transmission power difference.

[0736] In an alternative embodiment, sending fourth indication information to the terminal device includes:

[0737] Sending first downlink control information to the terminal device, wherein the first downlink control information includes the fourth indication information.

[0738] Alternatively, sending a fourth radio resource control message to the terminal device; wherein, the fourth radio resource control message includes the fourth indication information.

[0739] Alternatively, sending a fourth media access control message to the terminal device; wherein, the fourth media access control message includes the fourth indication information.

[0740] In an alternative embodiment, the method provided in this embodiment further includes:

[0741] Sending sixth indication information to the terminal device; wherein, the sixth indication information is used to indicate the space filter with optimal performance; the space filter indicated by the sixth indication information is used to send Message 3 to the first network device based on this space filter.

[0742] For the detailed content of the above method, reference can be made to the description of the corresponding method embodiment in the foregoing embodiment. The implementation principle and technical effects are similar, and will not be elaborated herein.

[0743] Figure 10 It is a signaling interaction process schematic diagram of a timing advance acquisition method provided in an embodiment of the present application. As Figure 10 shown, on the basis of the above embodiment, this embodiment details the signaling interaction process. The method includes the following steps:

[0744] Step 1001, the second network device sends an RRC message to the terminal device, and the RRC message is used to indicate the configuration information of the SRS.

[0745] For example, the second network device configures TCI-UL-State for the terminal device through the RRC message.

[0746] Step 1002, the second network device sends first downlink control information (i.e., PDCCH order information) to the terminal device; wherein, the PDCCH order information includes first indication information, and the first indication information is used to indicate the SRS associated with Message 1.

[0747] Among them, the PDCCH order information (DCI format 1_0) includes first indication information, and the first indication information is SRS-Resource#1 (this is an SRS indication field, that is, SRS ID indicator). Thus, the first indication information indicates the SRS associated with Message 1, which is SRS-Resource#1.

[0748] The spatial filter (i.e., beam) of SRS-Resource#1 is the spatial filter of the configured TCI-UL-State-ID#1.

[0749] Step 1003: The terminal device sends Message 1 to the first network device on the time-frequency resource, where Message 1 includes a preamble.

[0750] Among them, the indication information (preamble index) of the preamble is indicated by the corresponding field in the PDCCH order information. The time-frequency resource for sending Message 1 is determined by the spatial filter (RO) associated with the indication information (SSB index) of the SSB in the PDCCH order information.

[0751] Among them, the spatial filter for sending Message 1 uses the spatial filter of the above-mentioned SRS-Resource#1, that is, the spatial filter of TCI-UL-State-ID#1.

[0752] Among them, for the transmission power of Message 1, refer to Figure 2 the introduction.

[0753] Step 1004: After receiving Message 1 sent by the terminal device, the first network device estimates TA based on the preamble in Message 1.

[0754] Step 1005: The first network device sends a response message to the second network device, and the response message includes TA.

[0755] Among them, the first network device can send an RAR MAC PDU message to the second network device, and the RAR MAC PDU message includes TA. For example, the RAR MAC PDU message carries a TAG ID, and the TAG ID indicates TA.

[0756] Step 1006: The second network device sends a response message to the terminal device, and the response message includes TA.

[0757] Among them, the second network device may send a RAR MAC PDU message to the terminal device, and the TA is included in the RAR MAC PDU message. For example, the RAR MAC PDU message carries a TAG ID, and the TAG ID indicates the TA.

[0758] Step 1007: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0759] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS with the first network device according to the received TA.

[0760] Figure 11 It is a signaling interaction process schematic diagram of the method for obtaining the timing advance provided by an embodiment of the present application. As Figure 11 shown, on the basis of the above embodiment, this embodiment details the signaling interaction process. The method includes the following steps:

[0761] Step 1101: The second network device sends an RRC message to the terminal device, and the RRC message is used to indicate the configuration information of the SRS.

[0762] Step 1102: The second network device determines the SRS associated with Message 1.

[0763] That is, the second network device establishes the association between Message 1 and the SRS. For example, PRACH occasion 1 is associated with SRSresource 1, PRACH occasion 2 is associated with SRS resource 2, and PRACH occasion 3 is associated with SRSresource 3.

[0764] Optionally, in step 1103, the second network device sends a first indication message to the terminal device, and the first indication message is used to indicate the SRS associated with Message 1.

[0765] For example, the first indication message is sent through an RRC message or a MAC CE message. Or the first indication message has been predefined for the terminal device.

[0766] Step 1104: The second network device sends downlink control information (DCI format 1_1 / 1_2) to the terminal device, and the downlink control information is used to indicate that the subsequent uplink channel / signal transmission of the terminal device uses the spatial filter indicated in TCI-UL-State-Id#1.

[0767] Step 1105: The second network device sends PDCCH order information (DCI format 1_0) to the terminal device. The PDCCH order information includes the indication information (preamble index) of the preamble and the indication information (SSB index) of the SSB. The PDCCH order information is used to trigger the terminal device to send Message 1 to the first network device.

[0768] Step 1106: The terminal device sends Message 1 to the first network device according to the spatial filter of the SRS associated with Message 1, where Message 1 includes a preamble.

[0769] The spatial filter of the SRS associated with Message 1 is the beam indicated in the TCI-UL-State-ID#1 indicated by the second network device.

[0770] For the transmission power of Message 1, refer to Figure 2 the introduction.

[0771] Step 1107: After receiving Message 1 sent by the terminal device, the first network device estimates the TA according to the preamble in Message 1.

[0772] Step 1108: The first network device sends a response message to the second network device, and the response message includes the TA.

[0773] The first network device may send an RAR MAC PDU message to the second network device, and the RAR MAC PDU message includes the TA. For example, the RAR MAC PDU message carries a TAG ID, and the TAG ID indicates the TA.

[0774] Step 1109: The second network device sends a response message to the terminal device, and the response message includes the TA.

[0775] The second network device may send an RAR MAC PDU message to the terminal device, and the RAR MAC PDU message includes the TA. For example, the RAR MAC PDU message carries a TAG ID, and the TAG ID indicates the TA.

[0776] Step 1110: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0777] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS with the first network device according to the received TA.

[0778] Figure 12Schematic diagram of signaling interaction process for the method of obtaining timing advance provided by an embodiment of this application, as shown in Figure 12 shown. Based on the above embodiment, this embodiment elaborates on the signaling interaction process in detail. The method includes the following steps:

[0779] Step 1201: The second network device sends second indication information to the terminal device; wherein, the second indication information is used to indicate the number of times of retransmission of Message 1.

[0780] Among them, the second network device configures a fixed spatial filter for the terminal device to send Message 1 to the first network device. And the second network device configures the number of times of retransmission N of Message 1 for the terminal device.

[0781] Step 1202: The terminal device receives each SSB sent by the second network device and determines the SSB with the largest RSRP value.

[0782] For example, the terminal device receives SSB1, SSB2, and SSB3 sent by the second network device. Then, the terminal device measures and compares the RSRP of each received SSB and determines that the RSRP value of SSB3 is the largest.

[0783] Step 1203: The terminal device retransmits Message 1 to the first network device based on the spatial filter corresponding to the SSB with the largest RSRP value.

[0784] Among them, for the transmission power of Message 1, refer to the introduction in Figure 2 .

[0785] Step 1204: The first network device receives Message 1 based on different spatial filters. And the first network device estimates TA according to the preamble in Message 1.

[0786] Step 1205: The first network device sends a response message to the second network device, and the TA is included in this response message.

[0787] Among them, the first network device can send an RAR MAC PDU message to the second network device, and the TA is included in this RAR MAC PDU message. For example, the RAR MAC PDU message carries a TAG ID, and this TAG ID indicates the TA.

[0788] Step 1206: The second network device sends a response message to the terminal device, and the TA is included in this response message.

[0789] Among them, the second network device may send a RAR MAC PDU message to the terminal device, and the TA is included in the RAR MAC PDU message. For example, the TAG ID is carried in the RAR MAC PDU message, and the TA is indicated by the TAG ID.

[0790] Step 1207: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0791] For example, the terminal device adjusts the PUSCH / PUCCH / SRS of the uplink transmission with the first network device according to the received TA.

[0792] Figure 13 It is a schematic diagram of the signaling interaction process of the method for obtaining the timing advance provided by an embodiment of the present application. As Figure 13 shown, on the basis of the above embodiment, the signaling interaction process is described in detail in this embodiment. The method includes the following steps:

[0793] Step 1301: The second network device sends indication information to the terminal device. The indication signaling is used to indicate that the terminal device sends Message 1 to the first network device based on a set of spatial filters; the indication signaling is L1 DCI indication or high-layer signaling configuration.

[0794] Step 1302: The terminal device sends Message 1 to the first network device based on the spatial filter in a set of spatial filters. The preamble is included in Message 1.

[0795] For example, the terminal device sends Message 1 to the first network device based on each different spatial filter in each time slot of different time slots. For example, the terminal device sends Message 1 to the first network device based on spatial filter 1 in time slot 1; the terminal device sends Message 1 to the first network device based on spatial filter 2 in time slot 2; the terminal device sends Message 1 to the first network device based on spatial filter 3 in time slot 3.

[0796] Among them, for the transmission power of Message 1, see Figure 2 for the introduction.

[0797] Step 1303: The first network device receives Message 1 sent by the terminal device based on a fixed spatial filter. And the first network device determines the spatial filter with the optimal performance. The first network device estimates the TA according to the preamble in Message 1.

[0798] Step 1304a: The first network device sends a response message to the second network device, and the TA is included in the response message.

[0799] Among them, the first network device may send a RAR MAC PDU message to the second network device, and the TA is included in the RAR MAC PDU message. For example, the TAG ID is carried in the RAR MAC PDU message, and the TA is indicated by the TAG ID.

[0800] Step 1304b: The first network device sends sixth indication information to the second network device; among them, the sixth indication information is used to indicate the space filter with the best performance.

[0801] For example, the first network device sends a RAR MAC PDU message to the second network device, and the sixth indication information is included in the RAR MAC PDU message.

[0802] Step 1305a: The second network device sends a response message to the terminal device, and the TA is included in the response message.

[0803] Among them, the second network device may send a RAR MAC PDU message to the terminal device, and the TA is included in the RAR MAC PDU message. For example, the TAG ID is carried in the RAR MAC PDU message, and the TA is indicated by the TAG ID.

[0804] Step 11305b: The second network device sends sixth indication information to the terminal device; among them, the sixth indication information is used to indicate the space filter with the best performance.

[0805] For example, the second network device may send a RAR MAC PDU message to the terminal device, and the sixth indication information is included in the RAR MAC PDU message.

[0806] Step 1306: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0807] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS with the first network device according to the received TA.

[0808] Step 1307: The terminal device sends Message 3 to the first network device based on the space filter indicated by the sixth indication information and the obtained TA.

[0809] Figure 14 It is a schematic diagram of the signaling interaction process of the timing advance acquisition method provided by an embodiment of the present application. As Figure 14 shown, on the basis of the above embodiment, the signaling interaction process is described in detail in this embodiment. The method includes the following steps:

[0810] Step 1401: The second network device configures an aperiodic SRS for the terminal device through an RRC message.

[0811] For example, two SRS sets are configured, namely SRS resource set1 and SRS resource set2. Among them, SRS resource set2 contains third indication information (additional PCI index), and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0812] Step 1402: In time slot k, the second network device sends downlink control information (DCI format1_1 / 1_2) to the terminal device. The downlink control information is used to indicate that the terminal device uses the spatial filter indicated in TCI-UL-State to send SRS in the uplink transmission after this time.

[0813] For example, the downlink control information instructs the terminal device to use the spatial filter for receiving SSB-index-#1 to send SRS to the network device.

[0814] At this time, assuming the UL-only-TRP scenario, SSB can also be sent to the terminal device.

[0815] Step 1403: In time slot k, the second network device sends first downlink control information (DCI format0_1) to the terminal device.

[0816] Among them, the first downlink control information (DCI format 0_1) includes an SRS request field (SRS_request field), and the first downlink control information is used to trigger the terminal device to send SRS to the first network device.

[0817] Alternatively, for aperiodic SRS, the first downlink control information (DCI format 0_1) includes third indication information (additional PCI index).

[0818] Step 1404: The second network device sends fourth indication information to the terminal device; among them, the fourth indication information is used to indicate the transmission power difference.

[0819] Among them, the transmission power difference is the delta_power_offset value. The transmission power difference characterizes the difference between the power of SRS resource set1 sent by the terminal device to the second network device and the power of SRS resource set2 sent by the terminal device to the first network device.

[0820] Among them, the fourth indication information can be an independent signaling, or carried by an RRC message, or carried by a MAC CE message.

[0821] Step 1405: The terminal device determines the transmission power of the SRS according to the transmission power difference.

[0822] For the method of calculating the transmission power of the SRS, refer to the foregoing embodiments.

[0823] Step 1406: The terminal device sends the SRS to the first network device according to the spatial filter indicated by the second network device.

[0824] Among them, the downlink control information (DCI format 1_1 / 1_2) indicates that the terminal device uses the spatial filter indicated in the TCI-UL-State for the uplink transmission after this time to send the SRS. Thus, the terminal device sends the SRS to the first network device according to the spatial filter indicated in the TCI-UL-State.

[0825] Step 1407: The first network device estimates the TA according to the SRS.

[0826] Step 1408: The first network device sends a response message to the second network device, and the TA is included in the response message.

[0827] Among them, the first network device may send an RAR MAC PDU message to the second network device, and the TA is included in the RAR MAC PDU message. For example, the RAR MAC PDU message carries a TAG ID, and the TAG ID indicates the TA.

[0828] Step 1409: The second network device sends a response message to the terminal device, and the TA is included in the response message.

[0829] Among them, the second network device may send an RAR MAC PDU message to the terminal device, and the TA is included in the RAR MAC PDU message. For example, the RAR MAC PDU message carries a TAG ID, and the TAG ID indicates the TA.

[0830] Step 1410: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0831] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS with the first network device according to the received TA.

[0832] Figure 15 It is a schematic structural diagram of an acquisition device for timing advance provided by an embodiment of the present application, as Figure 15As shown in the figure, an embodiment of the present application provides an apparatus for obtaining timing advance. This apparatus can be applied to a terminal device in the 5G system architecture as described above, so as to implement for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, determine the spatial filter used when sending a message in the random access process to the network device, so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain TA; it can also implement for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, determine the spatial filter used when sending a message in the random access process to the network device, and determine the transmission power used when sending a message in the random access process to the network device; so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain TA. The apparatus includes: a memory 1510, a transceiver 1520, and a processor 1530. The transceiver 1520 is used to receive and send data under the control of the processor 1530.

[0833] Among them, in Figure 15 , the bus architecture may include any number of interconnected buses and bridges. Specifically, various circuits of one or more processors 1530 represented by the processor 1530 and the memory 1510 represented by the memory 1510 are linked together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art. Therefore, they will not be further described herein. The bus interface provides an interface. The transceiver 1520 can be multiple components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on the transmission medium, and these transmission mediums include, these transmission mediums include wireless channels, wired channels, optical cables and other transmission mediums. For different user devices, the user interface 1540 can also be an interface capable of externally connecting or internally connecting required devices, and the connected devices include but are not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0834] The processor 1530 is responsible for managing the bus architecture and general processing, and the memory 1510 can store the data used by the processor 1530600 when executing operations.

[0835] Optionally, the processor 1530 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device). The processor 1530 may also adopt a multi-core architecture.

[0836] The processor 1530 is used to execute any method provided by the embodiments of the present application according to the obtained executable instructions by calling the program stored in the memory 1510. The processor 1530 and the memory 1510 may also be physically separated.

[0837] In this embodiment, the memory 1510 is used to store computer programs. The transceiver 1520 is used to transmit and receive data under the control of the processor 1530. The processor 1530 is used to read the computer program in the memory 1510 and perform the following operations:

[0838] Based on a spatial filter, send a message 1 to a first network device, where the message 1 includes a preamble, and the preamble is used to determine a timing advance. The spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; or, based on a spatial filter, send a channel sounding reference signal to the first network device, where the channel sounding reference signal is used to determine a timing advance. The spatial filter is a spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter;

[0839] Receive a response message sent by a second network device; where the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0840] In an optional embodiment, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to the channel sounding reference signal associated with the message 1.

[0841] When the spatial filter is a specified spatial filter, the spatial filter is a spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0842] In an alternative embodiment, the processor 1530 is further configured to: receive first indication information sent by a second network device; wherein the first indication information is used to indicate a channel sounding reference signal associated with Message 1.

[0843] In an alternative embodiment, when receiving the first indication information sent by the second network device, the processor 1530 is specifically configured to:

[0844] receive first downlink control information sent by the second network device; wherein the first downlink control information includes the first indication information.

[0845] Alternatively, receive a first radio resource control message sent by the second network device; wherein the first radio resource control message includes the first indication information.

[0846] Alternatively, receive a first media access control message sent by the second network device; wherein the first media access control message includes the first indication information.

[0847] In an alternative embodiment, the processor 1530 is further configured to: receive second indication information sent by the second network device; wherein the second indication information is used to indicate the number of repetitions of Message 1.

[0848] In an alternative embodiment, when receiving the second indication information sent by the second network device, the processor 1530 is specifically configured to:

[0849] receive a second radio resource control message sent by the second network device; wherein the second radio resource control message includes the second indication information.

[0850] Alternatively, receive a second media access control message sent by the second network device; wherein the second media access control message includes the second indication information.

[0851] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time domain resource for transmitting the channel sounding reference signal.

[0852] Alternatively, in an alternative embodiment, the processor 1530 is further configured to: receive third indication information sent by the second network device, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0853] In an alternative embodiment, when receiving the third indication information sent by the second network device, the processor 1530 is specifically configured to:

[0854] Receive the first downlink control information sent by a second network device; wherein, the first downlink control information includes third indication information; alternatively, the first downlink control information is used to instruct the terminal device to send a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes third indication information.

[0855] Alternatively, receive a third radio resource control message sent by the second network device; wherein, the third radio resource control message includes third indication information.

[0856] Alternatively, receive a third media access control message sent by the second network device; wherein, the third media access control message includes third indication information.

[0857] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0858] The spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information.

[0859] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0860] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0861] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0862] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals.

[0863] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals.

[0864] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is the joint transmission indication status information pool, or the status information pool is the uplink transmission indication status information pool.

[0865] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0866] In an optional embodiment, the transmission power of message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, the second preset power; wherein, the second preset power is the sum of the target reception power of message 1 and the path loss power of the uplink-only receiving point.

[0867] The path loss power of the uplink-only receiving point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0868] In an optional embodiment, the processor 1530 is further configured to: receive the fifth indication information sent by the second network device; wherein, the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink reception signal power difference.

[0869] In an optional embodiment, when the processor 1530 receives the fifth indication information sent by the second network device, it is specifically configured to:

[0870] Receive the second downlink control information sent by the second network device; wherein, the second downlink control information includes the fifth indication information.

[0871] Or, receive the high-layer signaling sent by the second network device; wherein, the high-layer signaling includes the fifth indication information.

[0872] In an optional embodiment, the transmission power of the channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is the sum of the power value and the transmission power difference.

[0873] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

[0874] The power value represents the sum of the following information: the reception power of the channel sounding reference signal, the transmission bandwidth of the channel sounding reference signal, the preset power compensation factor, the downlink path loss information, and the adjustment amount of the transmission power of the physical uplink shared channel of the terminal device.

[0875] In an optional embodiment, the processor 1530 is further configured to: receive the fourth indication information sent by the second network device; wherein, the fourth indication information is used to indicate the transmission power difference.

[0876] In an alternative embodiment, when the processor 1530 receives the fourth indication information sent by the second network device, it is specifically configured to:

[0877] Receive the first downlink control information sent by the second network device, where the first downlink control information includes the fourth indication information.

[0878] Alternatively, receive the fourth radio resource control message sent by the second network device; where the fourth radio resource control message includes the fourth indication information.

[0879] Alternatively, receive the fourth media access control message sent by the second network device; where the fourth media access control message includes the fourth indication information.

[0880] In an alternative embodiment, the processor 1530 is further configured to:

[0881] Receive the sixth indication information sent by the second network device; where the sixth indication information is used to indicate the spatial filter with the optimal performance; based on the spatial filter indicated by the sixth indication information, send Message 3 to the first network device.

[0882] It should be noted here that the above device provided by the embodiments of the present invention can implement all the method steps implemented by the above method embodiments and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiments will not be specifically described in this embodiment.

[0883] Figure 16 It is a schematic structural diagram of an apparatus for obtaining timing advance provided in an embodiment of the present application, as Figure 16As shown, an embodiment of the present application provides an apparatus for obtaining timing advance, which can be applied to a network device in the 5G system architecture as described above. The network device is a first network device, so as to implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, determining the spatial filter used when sending a message in the random access process to the network device, so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain TA; it can also implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of obtaining TA, determining the spatial filter used when sending a message in the random access process to the network device and the transmission power used when sending a message in the random access process to the network device; so that the terminal device can send a message in the random access process to the network device, and the terminal device can obtain TA. The apparatus includes: a memory 1610, a transceiver 1620, and a processor 1630. The transceiver 1620 is used to receive and send data under the control of the processor 1630.

[0884] Among them, in Figure 16 , the bus architecture may include any number of interconnected buses and bridges, specifically, various circuits of one or more processors 1630 represented by the processor 1630 and the memory 1610 represented by the memory 1610 are linked together. The bus architecture can also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, so they will not be further described herein. The bus interface provides an interface. The transceiver 1620 may be multiple components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium, and these transmission mediums include wireless channels, wired channels, optical fiber cables, etc. The processor 1630 is responsible for managing the bus architecture and general processing, and the memory 1610 can store the data used by the processor 1630x10 when performing operations.

[0885] The processor 1630 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor 1630 may also adopt a multi-core architecture.

[0886] The processor 1630 is used to execute any method provided in the embodiments of the present application according to the obtained executable instructions by calling the computer program stored in the memory 1610. The processor 1630 and the memory 1610 may also be physically separated.

[0887] In this embodiment, the memory 1610 is used to store a computer program. The transceiver 1620 is used to transmit and receive data under the control of the processor 1630. The processor 1630 is used to read the computer program in the memory 1610 and perform the following operations:

[0888] Receive message 1 sent by the terminal device based on the spatial filter, where message 1 includes a preamble, and the preamble is used to determine the timing advance. The spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or receive the channel sounding reference signal sent by the terminal device based on the spatial filter, where the channel sounding reference signal is used to determine the timing advance. The spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter;

[0889] Send a response message to the second network device; where the response message includes the timing advance, and the response message is used to feed back to the terminal device.

[0890] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with message 1.

[0891] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0892] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0893] The spatial filter is a spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information.

[0894] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0895] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0896] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0897] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identification in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals.

[0898] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identification in the set of channel sounding reference signals.

[0899] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identification in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool.

[0900] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0901] In an optional embodiment, the transmission power of sending Message 1 is the minimum of the following powers: the maximum transmit power of the terminal device, the second preset power; where the second preset power is the sum of the target receive power of Message 1 and the path loss power of the uplink-only receiving point.

[0902] The path loss power of the uplink-only receiving point is the difference between the receive power configured for the channel sounding reference signal and the transmit power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the uplink receive signal power difference, and the uplink receive signal power difference is the difference between the uplink receive signal power of the first network device and the uplink receive signal power of the second network device.

[0903] In an alternative embodiment, the transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is the sum of the power value and the transmission power difference.

[0904] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by the first network device and the transmission power of the channel sounding reference signal transmitted by the second network device.

[0905] The power value represents the sum of the following information: the received power of the channel sounding reference signal, the transmission bandwidth of the channel sounding reference signal, a preset power compensation factor, the downlink path loss information, and the adjustment amount of the transmission power of the physical uplink shared channel of the terminal device.

[0906] It should be noted here that the above device provided by the embodiments of the present invention can implement all the method steps implemented by the above method embodiments, and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiments will not be specifically described in this embodiment.

[0907] Figure 17 This is a schematic structural diagram of a timing advance acquisition device provided by an embodiment of the present application. As Figure 17 shown, an embodiment of the present application provides a timing advance acquisition device, which can be applied to a network device in the 5G system structure as described above. The network device is the second network device, so as to implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of acquiring TA, determine the spatial filter used when sending a message in the random access process to the network device, so that the terminal device can send a message in the random access process to the network device, and the terminal device can acquire TA; it can also implement, for the UL-only TRP scenario (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, during the process of acquiring TA, determine the spatial filter used when sending a message in the random access process to the network device, and determine the transmission power used when sending a message in the random access process to the network device; so that the terminal device can send a message in the random access process to the network device, and the terminal device can acquire TA. The device includes: a memory 1710, a transceiver 1720, and a processor 1730. The transceiver 1720 is used to receive and send data under the control of the processor 1730.

[0908] Among them, in Figure 17Among them, the bus architecture may include any number of interconnected buses and bridges, specifically, various circuits represented by one or more processors 1730 represented by processor 1730 and memory 1710 represented by memory 1710 are linked together. The bus architecture can also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, so they will not be further described herein. The bus interface provides an interface. The transceiver 1720 may be multiple components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium, and these transmission mediums include wireless channels, wired channels, optical fiber cables, and other transmission mediums. The processor 1730 is responsible for managing the bus architecture and general processing, and the memory 1710 can store the data used by the processor 1730x10 when executing operations.

[0909] The processor 1730 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor 1730 may also adopt a multi-core architecture.

[0910] The processor 1730 is used to execute any method provided by the embodiments of the present application according to the obtained executable instructions by calling the computer program stored in the memory 1710. The processor 1730 and the memory 1710 may also be physically separated.

[0911] In this embodiment, the memory 1710 is used to store a computer program. The transceiver 1720 is used to transmit and receive data under the control of the processor 1730. The processor 1730 is used to read the computer program in the memory 1710 and perform the following operations:

[0912] Send a first indication message to the terminal device; wherein, the first indication message is used to indicate a channel sounding reference signal associated with message 1.

[0913] Among them, the first indication information is used to send Message 1 to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information. Message 1 includes a preamble, and the preamble is used to determine the timing advance. The spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, the first indication information is used to send a sounding reference signal to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information. The channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter.

[0914] Receive the response message sent by the first network device and send the response message to the terminal device; among them, the response message includes the timing advance.

[0915] In an optional embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1.

[0916] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is the spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0917] In an optional embodiment, the processor 1730 is further configured to:

[0918] Send the first indication information to the terminal device; among them, the first indication information is used to indicate the channel sounding reference signal associated with Message 1.

[0919] In an optional embodiment, sending the first indication information to the terminal device includes:

[0920] Send the first downlink control information to the terminal device; among them, the first downlink control information includes the first indication information;

[0921] Or, send the first radio resource control message to the terminal device; among them, the first radio resource control message includes the first indication information;

[0922] Or, send the first media access control message to the terminal device; among them, the first media access control message includes the first indication information.

[0923] In an optional embodiment, the processor 1730 is further configured to: send the second indication information to the terminal device; among them, the second indication information is used to indicate the number of retransmissions of Message 1.

[0924] In an alternative embodiment, when the processor 1730 sends the second indication information to the terminal device, it is specifically configured to:

[0925] Send a second radio resource control message to the terminal device; wherein, the second radio resource control message includes the second indication information.

[0926] Alternatively, send a second media access control message to the terminal device; wherein, the second media access control message includes the second indication information.

[0927] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time-domain resource for transmitting the channel sounding reference signal.

[0928] Alternatively, the processor 1730 is further configured to: send a third indication information to the terminal device, and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0929] In an alternative embodiment, when the processor 1730 sends the third indication information to the terminal device, it is specifically configured to:

[0930] Send a first downlink control information to the terminal device; wherein, the first downlink control information includes the third indication information; or, the first downlink control information is used to instruct the terminal device to send a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes the third indication information.

[0931] Alternatively, send a third radio resource control message to the terminal device; wherein, the third radio resource control message includes the third indication information.

[0932] Alternatively, send a third media access control message to the terminal device; wherein, the third media access control message includes the third indication information.

[0933] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0934] The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information.

[0935] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0936] Alternatively, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0937] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0938] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals.

[0939] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals.

[0940] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool.

[0941] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0942] In an alternative embodiment, the transmission power of the message 1 is the minimum of the following powers: the maximum transmit power of the terminal device, the second preset power; where the second preset power is the sum of the target receive power of the message 1 and the path loss power of the uplink-only receiving point.

[0943] The path loss power of the uplink-only receiving point is the difference between the receive power configured for the channel sounding reference signal and the transmit power configured for the channel sounding reference signal; or, the path loss power of the uplink-only receiving point is the sum of the downlink path loss power of the first network device and the difference between the uplink receive signal powers, and the difference between the uplink receive signal powers is the difference between the uplink receive signal power of the first network device and the uplink receive signal power of the second network device.

[0944] In an alternative embodiment, the processor 1730 is further configured to:

[0945] Send the fifth indication information to the terminal device; where the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the difference between the uplink receive signal powers.

[0946] In an alternative embodiment, when the processor 1730 sends the fifth indication information to the terminal device, it is specifically configured to:

[0947] Send the second downlink control information to the terminal device; where the second downlink control information includes the fifth indication information.

[0948] Or, send high-layer signaling to the terminal device; where the high-layer signaling includes the fifth indication information.

[0949] In an alternative embodiment, the transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is the sum of the power value and the transmission power difference.

[0950] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by the first network device and the transmission power of the channel sounding reference signal transmitted by the second network device.

[0951] The power value represents the sum of the following information: the received power of the channel sounding reference signal, the transmission bandwidth of the channel sounding reference signal, a preset power compensation factor, the downlink path loss information, and the adjustment amount of the transmission power of the physical uplink shared channel of the terminal device.

[0952] In an alternative embodiment, the processor 1730 is further configured to: send fourth indication information to the terminal device; wherein, the fourth indication information is used to indicate the transmission power difference.

[0953] In an alternative embodiment, when the processor 1730 sends the fourth indication information to the terminal device, it is specifically configured to:

[0954] Send first downlink control information to the terminal device, wherein the first downlink control information includes the fourth indication information.

[0955] Or, send a fourth radio resource control message to the terminal device; wherein, the fourth radio resource control message includes the fourth indication information.

[0956] Or, send a fourth media access control message to the terminal device; wherein, the fourth media access control message includes the fourth indication information.

[0957] In an alternative embodiment, the processor 1730 is further configured to:

[0958] Send sixth indication information to the terminal device; wherein, the sixth indication information is used to indicate the space filter with the optimal performance; the space filter indicated by the sixth indication information is used to send Message 3 to the first network device based on this space filter.

[0959] It should be noted here that the above device provided by the embodiments of the present invention can implement all the method steps implemented by the above method embodiments and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiments are not specifically described in this embodiment.

[0960] Figure 18 It is a schematic structural diagram of a timing advance acquisition device provided by an embodiment of this application, as Figure 18As shown in the figure, an embodiment of the present application provides a timing advance acquisition device, which can be applied to a terminal device in the 5G system architecture as described above. The device 1800 includes:

[0961] A first sending module 1801, configured to send a message 1 to a first network device based on a spatial filter, where the message 1 includes a preamble, and the preamble is used to determine a timing advance. The spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; or, based on the spatial filter, send a channel sounding reference signal to the first network device, where the channel sounding reference signal is used to determine a timing advance, and the spatial filter is a spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter.

[0962] A first receiving module 1802, configured to receive a response message sent by a second network device; where the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0963] In an optional embodiment, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to the channel sounding reference signal associated with the message 1.

[0964] When the spatial filter is a specified spatial filter, the spatial filter is a spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0965] In an optional embodiment, the device provided in this embodiment further includes: a second receiving module, configured to receive first indication information sent by a second network device; where the first indication information is used to indicate a channel sounding reference signal associated with the message 1.

[0966] In an optional embodiment, when the second receiving module receives the first indication information sent by the second network device, it is specifically configured to:

[0967] Receive first downlink control information sent by the second network device; where the first downlink control information includes the first indication information.

[0968] Or, receive a first radio resource control message sent by the second network device; where the first radio resource control message includes the first indication information.

[0969] Or, receive a first media access control message sent by the second network device; where the first media access control message includes the first indication information.

[0970] In an alternative embodiment, the apparatus provided in this embodiment further includes: a third receiving module, configured to receive second indication information sent by a second network device; where the second indication information is used to indicate the number of times of retransmitting Message 1.

[0971] In an alternative embodiment, when receiving the second indication information sent by the second network device, the third receiving module is specifically configured to:

[0972] Receive a second radio resource control message sent by the second network device; where the second radio resource control message includes the second indication information.

[0973] Alternatively, receive a second media access control message sent by the second network device; where the second media access control message includes the second indication information.

[0974] In an alternative embodiment, the configuration information of the channel sounding reference signal indicates the time-domain resource for sending the channel sounding reference signal.

[0975] Alternatively, the apparatus provided in this embodiment further includes: a fourth receiving module, configured to receive third indication information sent by the second network device, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0976] In an alternative embodiment, when receiving the third indication information sent by the second network device, the fourth receiving module is specifically configured to:

[0977] Receive a first downlink control information sent by the second network device; where the first downlink control information includes the third indication information; or the first downlink control information is used to indicate that the terminal device sends a channel sounding reference signal, and the channel sounding reference signal to be sent to the first network device includes the third indication information.

[0978] Alternatively, receive a third radio resource control message sent by the second network device; where the third radio resource control message includes the third indication information.

[0979] Alternatively, receive a third media access control message sent by the second network device; where the third media access control message includes the third indication information.

[0980] In an alternative embodiment, when the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following:

[0981] The spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information.

[0982] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0983] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication status information.

[0984] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0985] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals.

[0986] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals.

[0987] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool.

[0988] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

[0989] In an alternative embodiment, the transmission power of Message 1 is the minimum of the following powers: the maximum transmission power of the terminal device, the second preset power; where the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only reception point.

[0990] The path loss power of the uplink-only reception point is the difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; or, the path loss power of the uplink-only reception point is the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, and the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device.

[0991] In an alternative embodiment, the apparatus provided in this embodiment further includes:

[0992] A fifth receiving module, configured to receive fifth indication information sent by a second network device; wherein the fifth indication information is used to indicate the path loss power of the uplink-only receiving point, or the fifth indication information is used to indicate the uplink received signal power difference.

[0993] In an optional embodiment, when the fifth receiving module receives the fifth indication information sent by the second network device, it is specifically configured to:

[0994] Receive second downlink control information sent by the second network device; wherein the second downlink control information includes the fifth indication information.

[0995] Or, receive high-layer signaling sent by the second network device; wherein the high-layer signaling includes the fifth indication information.

[0996] In an optional embodiment, the transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, a first preset power; the first preset power is the sum of a power value and a transmission power difference.

[0997] The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by the first network device and the transmission power of the channel sounding reference signal transmitted by the second network device.

[0998] The power value represents the sum of the following information: the received power of the channel sounding reference signal, the transmission bandwidth of the channel sounding reference signal, a preset power compensation factor, downlink path loss information, and an adjustment amount of the transmission power of the physical uplink shared channel of the terminal device.

[0999] In an optional embodiment, the apparatus provided in this embodiment further includes:

[1000] A sixth receiving module, configured to receive fourth indicat...

Claims

1. A method for obtaining timing advance, characterized in that, The method includes: Based on a spatial filter, sending Message 1 to a first network device, where Message 1 includes a preamble for determining a timing advance, and the spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; or, based on a spatial filter, sending a channel sounding reference signal to the first network device, where the channel sounding reference signal is used to determine a timing advance, and the spatial filter is a spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; Receiving a response message sent by a second network device; where the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

2. The method according to claim 1, wherein When the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to the channel sounding reference signal associated with Message 1; When the spatial filter is a specified spatial filter, the spatial filter is a spatial filter corresponding to the synchronization signal block with the optimal reference signal reception power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

3. The method according to claim 2, characterized in that, The method further includes: receiving first indication information sent by the second network device; where the first indication information is used to indicate a channel sounding reference signal associated with Message 1.

4. The method according to claim 2, wherein The method further includes: receiving second indication information sent by the second network device; where the second indication information is used to indicate the number of repetitions of Message 1.

5. The method according to claim 1, characterized in that, The configuration information of the channel sounding reference signal indicates the time-domain resource for sending the channel sounding reference signal; Or, the method further includes: receiving third indication information sent by the second network device, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

6. The method according to any one of claims 1-5, characterized in that, When the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following: The spatial filter is a spatial filter corresponding to the channel sounding reference signal included in the uplink transmission indication status information for transmission; Or, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information; Or, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication status information; Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal; Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in a set of channel sounding reference signals; the set of channel sounding reference signals includes multiple channel sounding reference signals; Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in a set of channel sounding reference signals; Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool; Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information last sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information last sent by the second network device.

7. The method according to any one of claims 1-5, characterized in that The transmission power for sending the channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device, a first preset power; the first preset power is determined based on the transmission power difference; The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

8. The method according to claim 7, wherein The method further includes: receiving fourth indication information sent by the second network device; where the fourth indication information is used to indicate the transmission power difference.

9. The method according to any one of claims 1-5, characterized in that, The transmission power for sending Message 1 is the minimum of the following powers: the maximum transmit power of the terminal device, a second preset power; the second preset power is the sum of the target receive power of Message 1 and the path loss power of the uplink-only receive point.

10. The method according to claim 9, wherein The path loss power of the uplink-only receive point is any one of the following: The difference between the receive power configured for the channel sounding reference signal and the transmit power configured for the channel sounding reference signal; Or, the sum of the downlink path loss power of the first network device and the uplink receive signal power difference, where the uplink receive signal power difference is the difference between the uplink receive signal power of the first network device and the uplink receive signal power of the second network device; Or, the downlink path loss power of the first network device and the sum of the path loss offset power between the first network device and the second network device.

11. A method for obtaining timing advance, characterized in that, The method includes: Receiving Message 1 sent by the terminal device based on a spatial filter, where the Message 1 includes a preamble, and the preamble is used to determine the timing advance, and the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or receiving the channel sounding reference signal sent by the terminal device based on a spatial filter, where the channel sounding reference signal is used to determine the timing advance, and the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; Sending a response message to the second network device; where the response message includes the timing advance, and the response message is used to feedback to the terminal device.

12. The method according to claim 11, characterized in that When the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1; When the spatial filter is a specified spatial filter, when the spatial filter receives a synchronization signal block, it is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

13. The method according to claim 11, wherein When the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following: The spatial filter is the spatial filter for transmitting the channel sounding reference signal included in the uplink transmission indication status information; Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information; Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information; Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal; Or, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set; the channel sounding reference signal set includes multiple channel sounding reference signals; Or, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set; Or, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool; Or, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

14. The method according to any one of claims 11-13, characterized in that, The transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference; The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by the first network device and the transmission power of the channel sounding reference signal transmitted by the second network device.

15. The method according to any one of claims 11-13, characterized in that, The transmission power of the transmitted Message 1 is the minimum of the following powers: the maximum transmit power of the terminal device, the second preset power; the second preset power is the sum of the target received power of Message 1 and the path loss power of the uplink-only receiving point.

16. The method according to claim 15, wherein The path loss power of the uplink-only receiving point is any one of the following: The difference between the received power configured for the channel sounding reference signal and the transmitted power configured for the channel sounding reference signal; Or, the sum of the downlink path loss power of the first network device and the uplink received signal power difference, where the uplink received signal power difference is the difference between the uplink received signal power of the first network device and the uplink received signal power of the second network device; Alternatively, the downlink path loss power of the first network device and the sum of the path loss offset power between the first network device and the second network device.

17. A method for obtaining a timing advance, characterized in that, The method includes: Sending first indication information to the terminal device; wherein, the first indication information is used to indicate a channel sounding reference signal associated with Message 1; Wherein, the first indication information is used to send Message 1 to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, and the Message 1 includes a preamble, and the preamble is used to determine the timing advance, and the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, the first indication information is used to send a sounding reference signal to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, and the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter; Receiving a response message sent by the first network device and sending the response message to the terminal device; wherein, the response message includes the timing advance.

18. The method according to claim 17, characterized in that When the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1; When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power when receiving the synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

19. The method according to claim 18, wherein The method further includes: sending first indication information to the terminal device; wherein, the first indication information is used to indicate a channel sounding reference signal associated with Message 1.

20. The method according to claim 18, characterized in that The method further includes: sending second indication information to the terminal device; wherein, the second indication information is used to indicate the number of repetitions of Message 1.

21. The method according to claim 17, characterized in that, The configuration information of the channel sounding reference signal indicates the time domain resource for sending the channel sounding reference signal; Alternatively, the method further includes: sending third indication information to the terminal device, and the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

22. The method according to any one of claims 17-21, characterized in that, When the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is any one of the following: The spatial filter is the spatial filter for sending the channel sounding reference signal included in the uplink transmission indication status information; Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information; Or, the spatial filter is the spatial filter for receiving the synchronization signal block included in the joint transmission indication status information; Or, the spatial filter is the spatial filter indicated by the transmission indication status information of the channel sounding reference signal; Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; the set of channel sounding reference signals includes a plurality of channel sounding reference signals; Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information corresponding to the channel sounding reference signal with the smallest identifier in the set of channel sounding reference signals; Alternatively, the spatial filter is the spatial filter indicated by the transmission indication status information with the smallest identifier in the status information pool, where the status information pool is a joint transmission indication status information pool, or the status information pool is an uplink transmission indication status information pool; Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information sent by the second network device most recently, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information sent by the second network device most recently.

23. The method according to any one of claims 17-21, characterized in that, The transmission power for sending the channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference; The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

24. The method according to claim 23, wherein The method further includes: Sending fourth indication information to the terminal device; where the fourth indication information is used to indicate the transmission power difference.

25. The method according to any one of claims 17-21, characterized in that The transmission power for sending Message 1 is the minimum of the following powers: the maximum transmit power of the terminal device, the second preset power; the second preset power is the sum of the target reception power of Message 1 and the path loss power of the uplink-only reception point.

26. The method according to claim 25, characterized in that, The path loss power of the uplink-only reception point is any one of the following: The difference between the reception power configured for the channel sounding reference signal and the transmission power configured for the channel sounding reference signal; Or, the sum of the downlink path loss power of the first network device and the uplink reception signal power difference, where the uplink reception signal power difference is the difference between the uplink reception signal power of the first network device and the uplink reception signal power of the second network device; Or, the downlink path loss power of the first network device, and the sum of the path loss offset power between the first network device and the second network device.

27. An apparatus for obtaining timing advance, characterized in that, The apparatus includes: a memory, a transceiver, a processor: The memory is used to store computer programs; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Based on a spatial filter, send Message 1 to a first network device, where Message 1 includes a preamble, and the preamble is used to determine a timing advance. The spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; or, based on a spatial filter, send a channel sounding reference signal to a first network device, where the channel sounding reference signal is used to determine a timing advance. The spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; Receive a response message sent by a second network device; where the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

28. The device according to claim 27, wherein When the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to the channel sounding reference signal associated with Message 1; When the spatial filter is a specified spatial filter, the spatial filter is a spatial filter corresponding to a synchronization signal block with the optimal reference signal received power when receiving a synchronization signal block, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

29. The device according to claim 27 or 28, characterized in that, The transmission power of the sent channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, a first preset power; the first preset power is determined based on a transmission power difference; The transmission power difference is the power difference between the transmission power of the channel sounding reference signal sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

30. An apparatus for obtaining timing advance, characterized in that The apparatus includes: a memory, a transceiver, and a processor: The memory is used to store a computer program; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations: Receive Message 1 sent by a terminal device based on a spatial filter, where Message 1 includes a preamble, and the preamble is used to determine a timing advance. The spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; or, receive a channel sounding reference signal sent by a terminal device based on a spatial filter, where the channel sounding reference signal is used to determine a timing advance. The spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; Send a response message to a second network device; where the response message includes a timing advance, and the response message is used to feedback to the terminal device.

31. The device according to claim 30, characterized in that, When the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to the channel sounding reference signal associated with Message 1; When the spatial filter is a specified spatial filter, when the spatial filter receives a synchronization signal block, it is the spatial filter corresponding to the synchronization signal block with the optimal reference signal reception power, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

32. The device according to claim 30 or 31, characterized in that, The transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference; The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by the first network device and the transmission power of the channel sounding reference signal transmitted by the second network device.

33. An apparatus for obtaining a timing advance, characterized in that, The device includes: a memory, a transceiver, and a processor: The memory is used to store computer programs; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Send first indication information to the terminal device; wherein, the first indication information is used to indicate the channel sounding reference signal associated with Message 1; Wherein, the first indication information is used to send Message 1 to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, and the Message 1 includes a preamble, and the preamble is used to determine the timing advance, and the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, the first indication information is used to send a sounding reference signal to the first network device based on the spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, and the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter; Receive a response message sent by the first network device and send the response message to the terminal device; wherein, the response message includes the timing advance.

34. The device according to claim 33, characterized in that, When the spatial filter is the spatial filter corresponding to the channel sounding reference signal, the spatial filter is the spatial filter corresponding to the channel sounding reference signal associated with Message 1; When the spatial filter is a specified spatial filter, when the spatial filter receives a synchronization signal block, it is the spatial filter corresponding to the synchronization signal block with the optimal reference signal reception power, or the spatial filter is a spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

35. The device according to claim 33 or 34, characterized in that, The transmission power of the transmitted channel sounding reference signal is the minimum of the following powers: the maximum transmission power of the terminal device, the first preset power; the first preset power is determined based on the transmission power difference; The transmission power difference is the power difference between the transmission power of the channel sounding reference signal transmitted by the first network device and the transmission power of the channel sounding reference signal transmitted by the second network device.

36. A timing advance acquisition device, characterized in that, The device includes: A first transmission module, configured to send Message 1 to a first network device based on a spatial filter, where Message 1 includes a preamble for determining a timing advance, and the spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; or, send a channel sounding reference signal to the first network device based on the spatial filter, where the channel sounding reference signal is used to determine the timing advance, and the spatial filter is a spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; A first reception module, configured to receive a response message sent by a second network device; where the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

37. An apparatus for obtaining a timing advance, characterized in that The apparatus includes: A reception module, configured to receive Message 1 sent by a terminal device based on a spatial filter, where Message 1 includes a preamble for determining a timing advance, and the spatial filter is a spatial filter corresponding to a channel sounding reference signal, or the spatial filter is a specified spatial filter; or, receive a channel sounding reference signal sent by the terminal device based on the spatial filter, where the channel sounding reference signal is used to determine the timing advance, and the spatial filter is a spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; A transmission module, configured to send a response message to the second network device; where the response message includes a timing advance, and the response message is used to feed back to the terminal device.

38. An apparatus for obtaining timing advance, characterized in that The apparatus includes: A first transmission module, configured to send first indication information to the terminal device; where the first indication information is used to indicate a channel sounding reference signal associated with Message 1; where the first indication information is used to send Message 1 to the first network device based on a spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, where Message 1 includes a preamble for determining a timing advance, and the spatial filter is a spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter; or, the first indication information is used to send a sounding reference signal to the first network device based on a spatial filter corresponding to the channel sounding reference signal indicated by the first indication information, where the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter; A first reception module, configured to receive a response message sent by the first network device and send the response message to the terminal device; where the response message includes a timing advance.

39. A non-transitory readable storage medium, characterized in that, The non-transitory readable storage medium stores a computer program, the computer program being configured to cause a processor to execute the method according to any one of claims 1-10, or the computer program being configured to cause a processor to execute the method according to any one of claims 11-16, or the computer program being configured to cause a processor to execute the method according to any one of claims 17-26.

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