Timing advance acquisition method and apparatus, and storage medium

Abstract

The present disclosure relates to the technical field of communications. Provided are a timing advance (TA) acquisition method and apparatus, and a storage medium. The method comprises: sending a message 1 to a first network device on the basis of a spatial filter, or, sending an SRS to the first network device on the basis of the spatial filter, wherein the spatial filter is a spatial filter corresponding to the SRS or a designated spatial filter; and receiving a response message sent by a second network device, wherein the response message comprises a TA, and the response message is sent by the first network device to the second network device. In a UL-only TRP scenario, when there is no downlink communication link between a network device and a terminal device, a spatial filter used when a message in a random access procedure is sent to the network device is determined during a TA acquisition process, so that the terminal device can send the message in the random access procedure to the network device, and the terminal device can acquire the TA.

Description

Timing advance acquisition method, device and storage medium

[0001] This disclosure claims priority to Chinese patent application number 202410053672.2, filed with the Patent Office of China on January 12, 2024, entitled “Method, device and storage medium for obtaining timing advance,” the entire contents of which are incorporated herein by reference.

[0002] This disclosure claims priority to a Chinese patent application filed on September 10, 2024, with application number 202411265683.3 and title “Method, device and storage medium for obtaining timing advance,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of communication technology, and in particular to a method, device, and storage medium for obtaining a timing advance. Background Art

[0004] During the communication between the terminal device and the network device, there is often a situation where there is no downlink communication link between the terminal device and the network device (ie, a UL-only TRP scenario).

[0005] 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 during the random access process, resulting in the terminal device being unable to send signaling during the random access process to the network device, resulting in the terminal device being unable to obtain the timing advance (TA). Summary of the Invention

[0006] The present disclosure provides a method, device and storage medium for obtaining timing advance, which enables the terminal device to send signaling in the random access process to the network device based on the spatial filter when there is no downlink communication link between the terminal device and the network device (i.e., UL-only TRP scenario), so that the terminal device can obtain TA in a timely manner.

[0007] In a first aspect, the present disclosure provides a method for obtaining a timing advance, the method comprising:

[0008] Sending message 1 to the first network device based on the spatial filter, where the message 1 includes a preamble, the preamble is used to determine the 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, sending 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;

[0009] A response message sent by the second network device is received; wherein the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0010] 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, in the process of obtaining 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 that 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, in the process of obtaining 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.

[0011] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1;

[0012] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0013] In this embodiment, multiple spatial filter selection methods 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 from a preset set of spatial filters. This facilitates the terminal device to send Message 1 or the SRS in the random access process to the first network device based on the spatial filter.

[0014] In some embodiments, the method further comprises:

[0015] Receive first indication information sent by the second network device; wherein the first indication information is used to indicate a channel sounding reference signal associated with message 1.

[0016] In this embodiment, the second network device needs to send first indication information to the terminal device, where the first indication information is used to indicate the SRS associated with message 1. The terminal device can then determine the SRS associated with message 1 based on the first indication information, and can then 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).

[0017] In some embodiments, receiving the first indication information sent by the second network device includes:

[0018] receiving first downlink control information sent by the second network device; wherein the first downlink control information includes first indication information;

[0019] Alternatively, receiving a first radio resource control message sent by a second network device; wherein the first radio resource control message includes first indication information;

[0020] Alternatively, a first media access control message sent by the second network device is received; wherein the first media access control message includes the first indication information.

[0021] In this embodiment, the first indication information can be carried by the following messages: first downlink control information (PDCCH order information), a first radio resource control (RRC) message, and a first media access control (MAC CE) message. Furthermore, the second network device can inform the terminal device of the first indication information in a variety of ways, so that the terminal device can determine the SRS associated with message 1, and further 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).

[0022] In some embodiments, the method further comprises:

[0023] Receive second indication information sent by the second network device; wherein the second indication information is used to indicate the number of times message 1 is repeatedly sent.

[0024] In this embodiment, the second network device needs to indicate the number of repetitions of Message 1. The second network device sends second indication information to the terminal device, where the second indication information is used to indicate the number of repetitions of Message 1. Furthermore, the terminal device uses a fixed spatial filter to send Message 1 to the first network device based on the number of repetitions indicated by the second indication information.

[0025] In some embodiments, receiving the second indication information sent by the second network device includes:

[0026] receiving a second radio resource control message sent by a second network device; wherein the second radio resource control message includes second indication information;

[0027] Alternatively, a second media access control message sent by a second network device is received; wherein the second media access control message includes second indication information.

[0028] In this embodiment, the second indication information may be carried by the following messages: a second radio resource control (RRC) message, a second media access control (MAC CE) message. Furthermore, the second network device may notify the terminal device of the second indication information in a variety of ways, so that the terminal device sends message 1 to the first network device using a fixed spatial filter based on the number of repetitions indicated by the second indication information.

[0029] In some embodiments, the method further comprises:

[0030] Determining configuration information of a channel sounding reference signal, where the configuration information is used to indicate a time domain resource for sending the channel sounding reference signal;

[0031] Alternatively, third indication information sent by the second network device is received, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0032] In this embodiment, the channel sounding reference signal configuration information 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. This allows the terminal device to determine the time domain resource for the SRS, or the cell to which the SRS belongs.

[0033] In some embodiments, receiving the third indication information sent by the second network device includes:

[0034] Receiving first downlink control information sent by the 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 the third indication information;

[0035] Alternatively, receiving a third radio resource control message sent by the second network device; wherein the third radio resource control message includes third indication information;

[0036] Alternatively, a third media access control message sent by the second network device is received; wherein the third media access control message includes third indication information.

[0037] In this embodiment, the third indication information is indicated in a variety of ways, so that the terminal device can determine the cell to which the SRS belongs.

[0038] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0039] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information;

[0040] Alternatively, the spatial filter is a spatial filter for receiving a synchronization signal block included in the uplink transmission indication state information;

[0041] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication state information;

[0042] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information of the channel sounding reference signal;

[0043] Alternatively, the spatial filter is a spatial filter indicated by the uplink transmission indication state 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;

[0044] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0045] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool;

[0046] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0047] In this embodiment, a variety of spatial filter selection methods are provided to facilitate the terminal device to send a message in the random access process to the first network device based on the spatial filter, thereby enabling the terminal device to obtain the TA.

[0048] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only;

[0049] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0050] 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.

[0051] In some embodiments, the method further comprises:

[0052] Receive fifth indication information sent by the second network device; wherein the fifth indication information is used to indicate the uplink path loss power of the receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0053] In this embodiment, the second network device needs to send the path loss power of the uplink receiving point only or the uplink received signal power difference to the terminal device in advance. The second network device can send fifth indication information to the terminal device; wherein the fifth indication information is used to indicate the path loss power of the uplink receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference. Thus, the terminal device determines the transmit power of message 1 based on the path loss power of the uplink receiving point only, and sends message 1 to the first network device. Alternatively, the terminal device determines the transmit power of message 1 based on the uplink received signal power difference, and sends message 1 to the first network device.

[0054] In some embodiments, receiving fifth indication information sent by the second network device includes:

[0055] receiving second downlink control information sent by the second network device; wherein the second downlink control information includes fifth indication information;

[0056] Alternatively, a higher layer signaling sent by the second network device is received; wherein the higher layer signaling includes the fifth indication information.

[0057] In this embodiment, multiple indication methods for indicating the path loss power of the uplink reception point only or the uplink received signal power difference are provided. The fifth indication information can be a separate signaling, or the fifth indication information can be carried by higher-layer signaling, or the fifth indication information can be carried by downlink control information. This allows the terminal device to determine the transmit power of message 1 based on the path loss power of the uplink reception point only or the uplink received signal power difference, and to send message 1 to the first network device.

[0058] In some embodiments, the transmit power of the channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device and the first preset power; the first preset power is determined based on the transmit power difference;

[0059] The transmission power difference is a 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.

[0060] In this embodiment, the terminal device can determine the transmission power of the SRS according to the above parameters, and then send the SRS to the first network device according to the transmission power of the SRS and the spatial filter.

[0061] In some embodiments, the method further comprises:

[0062] Receive fourth indication information sent by the second network device; wherein the fourth indication information is used to indicate a transmit power difference.

[0063] In this embodiment, the second network device needs to send the transmit power difference to the terminal device in advance. The second network device can send fourth indication information to the terminal device; the fourth indication information is used to indicate the transmit power difference. The terminal device then determines the transmit power of the SRS based on the transmit power difference and transmits the SRS to the first network device.

[0064] In some embodiments, receiving the fourth indication information sent by the second network device includes:

[0065] receiving first downlink control information sent by the second network device, wherein the first downlink control information includes fourth indication information;

[0066] Alternatively, receiving a fourth radio resource control message sent by the second network device; wherein the fourth radio resource control message includes fourth indication information;

[0067] Alternatively, a fourth media access control message sent by the second network device is received; wherein the fourth media access control message includes fourth indication information.

[0068] 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 can be carried by higher-layer signaling, or the fourth indication information can be carried by downlink control information. This allows the terminal device to determine the transmit power of the SRS based on the transmit power difference and transmit the SRS to the first network device.

[0069] In some embodiments, the method further comprises:

[0070] receiving sixth indication information sent by the second network device; wherein the sixth indication information is used to indicate the spatial filter with the best performance;

[0071] Based on the spatial filter indicated by the sixth indication information, message 3 is sent to the first network device.

[0072] 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 best performance; so that the terminal device can directly determine the spatial filter with the best 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 best performance.

[0073] In a second aspect, the present disclosure provides a method for obtaining a timing advance, the method comprising:

[0074] Receiving message 1 sent by a terminal device based on a spatial filter, wherein message 1 includes a preamble, the preamble is used to determine 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 receiving a channel sounding reference signal sent by a terminal device based on a spatial filter, wherein 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;

[0075] A response message is sent to the second network device; wherein the response message includes a timing advance, and the response message is used to feed back to the terminal device.

[0076] 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, in the process of obtaining 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 that 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, in the process of obtaining 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.

[0077] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1;

[0078] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0079] In this embodiment, multiple spatial filter selection methods 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 from a preset set of spatial filters. This facilitates the terminal device to send Message 1 or the SRS in the random access process to the first network device based on the spatial filter.

[0080] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0081] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information;

[0082] Alternatively, the spatial filter is a spatial filter for receiving a synchronization signal block included in the uplink transmission indication state information;

[0083] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication state information;

[0084] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information of the channel sounding reference signal;

[0085] Alternatively, the spatial filter is a spatial filter indicated by the uplink transmission indication state 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;

[0086] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0087] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool;

[0088] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0089] In this embodiment, a variety of spatial filter selection methods are provided to facilitate the terminal device to send a message in the random access process to the first network device based on the spatial filter, thereby enabling the terminal device to obtain the TA.

[0090] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only;

[0091] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0092] 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.

[0093] In some embodiments, the transmit power of the channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device and the first preset power; the first preset power is determined based on the transmit power difference;

[0094] The transmission power difference is a 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.

[0095] In this embodiment, the terminal device can determine the transmission power of the SRS according to the above parameters, and then send the SRS to the first network device according to the transmission power of the SRS and the spatial filter.

[0096] In a third aspect, the present disclosure provides a method for obtaining a timing advance, the method comprising:

[0097] 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;

[0098] 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, where the message 1 includes a preamble code, the preamble code 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, where the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter;

[0099] Receive a response message sent by the first network device, and send the response message to the terminal device; wherein the response message includes a timing advance.

[0100] 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, in the process of obtaining 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 that 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, in the process of obtaining 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.

[0101] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1;

[0102] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0103] In this embodiment, multiple spatial filter selection methods 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 from a preset set of spatial filters. This facilitates the terminal device to send Message 1 or the SRS in the random access process to the first network device based on the spatial filter.

[0104] In some embodiments, the method further comprises:

[0105] Send first indication information to the terminal device; wherein the first indication information is used to indicate a channel detection reference signal associated with message 1.

[0106] In this embodiment, the second network device needs to send first indication information to the terminal device, where the first indication information is used to indicate the SRS associated with message 1. The terminal device can then determine the SRS associated with message 1 based on the first indication information, and can then 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).

[0107] In some embodiments, sending the first indication information to the terminal device includes:

[0108] Sending first downlink control information to the terminal device; wherein the first downlink control information includes first indication information;

[0109] Alternatively, sending a first radio resource control message to the terminal device; wherein the first radio resource control message includes first indication information;

[0110] Alternatively, a first media access control message is sent to the terminal device; wherein the first media access control message includes first indication information.

[0111] In this embodiment, the first indication information can be carried by the following messages: first downlink control information (PDCCH order information), a first radio resource control (RRC) message, and a first media access control (MAC CE) message. Furthermore, the second network device can inform the terminal device of the first indication information in a variety of ways, so that the terminal device can determine the SRS associated with message 1, and further 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).

[0112] In some embodiments, the method further comprises:

[0113] Send a second indication message to the terminal device; wherein the second indication message is used to indicate the number of times message 1 is repeatedly sent.

[0114] In this embodiment, the second network device needs to indicate the number of repetitions of Message 1. The second network device sends second indication information to the terminal device, where the second indication information is used to indicate the number of repetitions of Message 1. Furthermore, the terminal device uses a fixed spatial filter to send Message 1 to the first network device based on the number of repetitions indicated by the second indication information.

[0115] In some embodiments, sending the second indication information to the terminal device includes:

[0116] Sending a second radio resource control message to the terminal device; wherein the second radio resource control message includes second indication information;

[0117] Alternatively, a second media access control message is sent to the terminal device; wherein the second media access control message includes second indication information.

[0118] In this embodiment, the second indication information may be carried by the following messages: a second radio resource control (RRC) message, a second media access control (MAC CE) message. Furthermore, the second network device may notify the terminal device of the second indication information in a variety of ways, so that the terminal device sends message 1 to the first network device using a fixed spatial filter based on the number of repetitions indicated by the second indication information.

[0119] In some embodiments, the method further comprises:

[0120] Determining configuration information of a channel sounding reference signal, where the configuration information is used to indicate a time domain resource for sending the channel sounding reference signal;

[0121] Alternatively, third indication information sent by the second network device is received, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0122] In this embodiment, the channel sounding reference signal configuration information 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. This allows the terminal device to determine the time domain resource for the SRS, or the cell to which the SRS belongs.

[0123] In some embodiments, sending the third indication information to the terminal device includes:

[0124] Sending 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 the third indication information;

[0125] Alternatively, a third radio resource control message is sent to the terminal device; wherein the third radio resource control message includes third indication information;

[0126] Alternatively, a third media access control message is sent 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.

[0127] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0128] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information;

[0129] Alternatively, the spatial filter is a spatial filter for receiving a synchronization signal block included in the uplink transmission indication state information;

[0130] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication state information;

[0131] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information of the channel sounding reference signal;

[0132] Alternatively, the spatial filter is a spatial filter indicated by the uplink transmission indication state 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;

[0133] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0134] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool;

[0135] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0136] In this embodiment, a variety of spatial filter selection methods are provided to facilitate the terminal device to send a message in the random access process to the first network device based on the spatial filter, thereby enabling the terminal device to obtain the TA.

[0137] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only;

[0138] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0139] 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.

[0140] In some embodiments, the method further comprises:

[0141] 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0142] In this embodiment, the second network device needs to send the path loss power of the uplink receiving point only or the uplink received signal power difference to the terminal device in advance. The second network device can send fifth indication information to the terminal device; wherein the fifth indication information is used to indicate the path loss power of the uplink receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference. Thus, the terminal device determines the transmit power of message 1 based on the path loss power of the uplink receiving point only, and sends message 1 to the first network device. Alternatively, the terminal device determines the transmit power of message 1 based on the uplink received signal power difference, and sends message 1 to the first network device.

[0143] In some embodiments, sending the fifth indication information to the terminal device includes:

[0144] Sending second downlink control information to the terminal device; wherein the second downlink control information includes fifth indication information;

[0145] Alternatively, a higher-layer signaling is sent to the terminal device; wherein the higher-layer signaling includes the fifth indication information.

[0146] In this embodiment, multiple indication methods for indicating the path loss power of the uplink reception point only or the uplink received signal power difference are provided. The fifth indication information can be a separate signaling, or the fifth indication information can be carried by higher-layer signaling, or the fifth indication information can be carried by downlink control information. This allows the terminal device to determine the transmit power of message 1 based on the path loss power of the uplink reception point only or the uplink received signal power difference, and to send message 1 to the first network device.

[0147] In some embodiments, the transmit power of the channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device and the first preset power; the first preset power is determined based on the transmit power difference;

[0148] The transmission power difference is a 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.

[0149] In this embodiment, the terminal device can determine the transmission power of the SRS according to the above parameters, and then send the SRS to the first network device according to the transmission power of the SRS and the spatial filter.

[0150] In some embodiments, the method further comprises:

[0151] Send fourth indication information to the terminal device; wherein the fourth indication information is used to indicate the sending power difference.

[0152] In this embodiment, the second network device needs to send the transmit power difference to the terminal device in advance. The second network device can send fourth indication information to the terminal device; the fourth indication information is used to indicate the transmit power difference. The terminal device then determines the transmit power of the SRS based on the transmit power difference and transmits the SRS to the first network device.

[0153] In some embodiments, sending the fourth indication information to the terminal device includes:

[0154] Sending first downlink control information to the terminal device, where the first downlink control information includes fourth indication information;

[0155] Alternatively, sending a fourth radio resource control message to the terminal device; wherein the fourth radio resource control message includes fourth indication information;

[0156] Alternatively, a fourth media access control message is sent to the terminal device; wherein the fourth media access control message includes fourth indication information.

[0157] 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 can be carried by higher-layer signaling, or the fourth indication information can be carried by downlink control information. This allows the terminal device to determine the transmit power of the SRS based on the transmit power difference and transmit the SRS to the first network device.

[0158] In some embodiments, the method further comprises:

[0159] Sending sixth indication information to the terminal device; wherein the sixth indication information is used to indicate the spatial filter with the best 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.

[0160] 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 best performance; so that the terminal device can directly determine the spatial filter with the best 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 best performance.

[0161] In a fourth aspect, the present disclosure provides a device for obtaining a timing advance, the device comprising: a memory, a transceiver, and a processor:

[0162] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer program in the memory and performing the following operations:

[0163] Sending message 1 to the first network device based on the spatial filter, where the message 1 includes a preamble, the preamble is used to determine the 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, sending 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;

[0164] A response message sent by the second network device is received; wherein the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0165] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1;

[0166] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0167] In some embodiments, the processor is further configured to:

[0168] Receive first indication information sent by the second network device; wherein the first indication information is used to indicate a channel sounding reference signal associated with message 1.

[0169] In some embodiments, when the processor receives the first indication information sent by the second network device, it is configured to:

[0170] receiving first downlink control information sent by the second network device; wherein the first downlink control information includes first indication information;

[0171] Alternatively, receiving a first radio resource control message sent by a second network device; wherein the first radio resource control message includes first indication information;

[0172] Alternatively, a first media access control message sent by the second network device is received; wherein the first media access control message includes the first indication information.

[0173] In some embodiments, the processor is further configured to:

[0174] Receive second indication information sent by the second network device; wherein the second indication information is used to indicate the number of times message 1 is repeatedly sent.

[0175] In some embodiments, when the processor receives the second indication information sent by the second network device, it is configured to:

[0176] receiving a second radio resource control message sent by a second network device; wherein the second radio resource control message includes second indication information;

[0177] Alternatively, a second media access control message sent by a second network device is received; wherein the second media access control message includes second indication information.

[0178] In some embodiments, the processor is further configured to:

[0179] Determining configuration information of a channel sounding reference signal, where the configuration information is used to indicate a time domain resource for sending the channel sounding reference signal;

[0180] Alternatively, third indication information sent by the second network device is received, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0181] In some embodiments, when the processor receives the third indication information sent by the second network device, it is configured to:

[0182] Receiving first downlink control information sent by the 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 the third indication information;

[0183] Alternatively, receiving a third radio resource control message sent by the second network device; wherein the third radio resource control message includes third indication information;

[0184] Alternatively, a third media access control message sent by the second network device is received; wherein the third media access control message includes third indication information.

[0185] In some embodiments, 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 used to send a channel sounding reference signal included in the uplink transmission indication state information;

[0186] Alternatively, the spatial filter is a spatial filter for receiving a synchronization signal block included in the uplink transmission indication state information;

[0187] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication state information;

[0188] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information of the channel sounding reference signal;

[0189] Alternatively, the spatial filter is a spatial filter indicated by the uplink transmission indication state 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;

[0190] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0191] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool;

[0192] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0193] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only;

[0194] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0195] In some embodiments, the processor is further configured to:

[0196] Receive fifth indication information sent by the second network device; wherein the fifth indication information is used to indicate the uplink path loss power of the receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0197] In some embodiments, when the processor receives the fifth indication information sent by the second network device, it is configured to:

[0198] receiving second downlink control information sent by the second network device; wherein the second downlink control information includes fifth indication information;

[0199] Alternatively, a higher layer signaling sent by the second network device is received; wherein the higher layer signaling includes the fifth indication information.

[0200] In some embodiments, the transmit power of the channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device and the first preset power; the first preset power is determined based on the transmit power difference;

[0201] The transmission power difference is a 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.

[0202] In some embodiments, the processor is further configured to:

[0203] Receive fourth indication information sent by the second network device; wherein the fourth indication information is used to indicate a transmit power difference.

[0204] In some embodiments, when the processor receives the fourth indication information sent by the second network device, it is configured to:

[0205] receiving first downlink control information sent by the second network device, wherein the first downlink control information includes fourth indication information;

[0206] Alternatively, receiving a fourth radio resource control message sent by the second network device; wherein the fourth radio resource control message includes fourth indication information;

[0207] Alternatively, a fourth media access control message sent by the second network device is received; wherein the fourth media access control message includes fourth indication information.

[0208] In some embodiments, the processor is further configured to:

[0209] receiving sixth indication information sent by the second network device; wherein the sixth indication information is used to indicate the spatial filter with the best performance;

[0210] Based on the spatial filter indicated by the sixth indication information, message 3 is sent to the first network device.

[0211] In a fifth aspect, the present disclosure provides a device for obtaining a timing advance, the device comprising: a memory, a transceiver, and a processor:

[0212] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer program in the memory and performing the following operations:

[0213] Receiving message 1 sent by a terminal device based on a spatial filter, wherein message 1 includes a preamble, the preamble is used to determine 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 receiving a channel sounding reference signal sent by a terminal device based on a spatial filter, wherein 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;

[0214] A response message is sent to the second network device; wherein the response message includes a timing advance, and the response message is used to feed back to the terminal device.

[0215] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1;

[0216] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0217] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0218] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information;

[0219] Alternatively, the spatial filter is a spatial filter for receiving a synchronization signal block included in the uplink transmission indication state information;

[0220] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication state information;

[0221] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information of the channel sounding reference signal;

[0222] Alternatively, the spatial filter is a spatial filter indicated by the uplink transmission indication state 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;

[0223] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0224] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool;

[0225] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0226] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only;

[0227] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0228] In some embodiments, the transmit power of the channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device and the first preset power; the first preset power is determined based on the transmit power difference;

[0229] The transmission power difference is a 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.

[0230] In a sixth aspect, the present disclosure provides a device for obtaining a timing advance, the device comprising: a memory, a transceiver, and a processor:

[0231] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer program in the memory and performing the following operations:

[0232] 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;

[0233] 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, where the message 1 includes a preamble code, the preamble code 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, where the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter;

[0234] Receive a response message sent by the first network device, and send the response message to the terminal device; wherein the response message includes a timing advance.

[0235] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1;

[0236] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0237] In some embodiments, the processor is further configured to:

[0238] Send first indication information to the terminal device; wherein the first indication information is used to indicate a channel detection reference signal associated with message 1.

[0239] In some embodiments, when the processor sends the first indication information to the terminal device, it is configured to:

[0240] Sending first downlink control information to the terminal device; wherein the first downlink control information includes first indication information;

[0241] Alternatively, sending a first radio resource control message to the terminal device; wherein the first radio resource control message includes first indication information;

[0242] Alternatively, a first media access control message is sent to the terminal device; wherein the first media access control message includes first indication information.

[0243] In some embodiments, the processor is further configured to:

[0244] Send a second indication message to the terminal device; wherein the second indication message is used to indicate the number of times message 1 is repeatedly sent.

[0245] In some embodiments, when the processor sends the second indication information to the terminal device, it is configured to:

[0246] Sending a second radio resource control message to the terminal device; wherein the second radio resource control message includes second indication information;

[0247] Alternatively, a second media access control message is sent to the terminal device; wherein the second media access control message includes second indication information.

[0248] In some embodiments, the processor is further configured to:

[0249] Determining configuration information of a channel sounding reference signal, where the configuration information is used to indicate a time domain resource for sending the channel sounding reference signal;

[0250] Alternatively, third indication information sent by the second network device is received, where the third indication information is used to indicate the cell to which the channel sounding reference signal belongs.

[0251] In some embodiments, when the processor sends the third indication information to the terminal device, it is configured to:

[0252] Sending 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 the third indication information;

[0253] Alternatively, a third radio resource control message is sent to the terminal device; wherein the third radio resource control message includes third indication information;

[0254] Alternatively, a third media access control message is sent to the terminal device; wherein the third media access control message includes third indication information.

[0255] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0256] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information;

[0257] Alternatively, the spatial filter is a spatial filter for receiving a synchronization signal block included in the uplink transmission indication state information;

[0258] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the joint transmission indication state information;

[0259] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information of the channel sounding reference signal;

[0260] Alternatively, the spatial filter is a spatial filter indicated by the uplink transmission indication state 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;

[0261] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set;

[0262] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool;

[0263] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0264] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only;

[0265] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0266] In some embodiments, the processor is further configured to:

[0267] 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0268] In some embodiments, when the processor sends the fifth indication information to the terminal device, it is configured to:

[0269] Sending second downlink control information to the terminal device; wherein the second downlink control information includes fifth indication information;

[0270] Alternatively, a higher-layer signaling is sent to the terminal device; wherein the higher-layer signaling includes the fifth indication information.

[0271] In some embodiments, the transmit power of the channel sounding reference signal is the minimum of the following powers: the maximum transmit power of the terminal device and the first preset power; the first preset power is determined based on the transmit power difference;

[0272] The transmission power difference is a 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.

[0273] In some embodiments, the processor is further configured to:

[0274] Send fourth indication information to the terminal device; wherein the fourth indication information is used to indicate the sending power difference.

[0275] In some embodiments, when the processor sends the fourth indication information to the terminal device, it is configured to:

[0276] Sending first downlink control information to the terminal device, where the first downlink control information includes fourth indication information;

[0277] Alternatively, sending a fourth radio resource control message to the terminal device; wherein the fourth radio resource control message includes fourth indication information;

[0278] Alternatively, a fourth media access control message is sent to the terminal device; wherein the fourth media access control message includes fourth indication information.

[0279] In some embodiments, the processor is further configured to:

[0280] Sending sixth indication information to the terminal device; wherein the sixth indication information is used to indicate the spatial filter with the best 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.

[0281] In a seventh aspect, the present disclosure provides a device for obtaining a timing advance, the device comprising:

[0282] A first sending module is configured to send a message 1 to a first network device based on a spatial filter, where the message 1 includes a preamble, the preamble is used to determine 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 the spatial filter, send a channel sounding reference signal to the first network device, 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;

[0283] The first receiving module is configured to receive 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.

[0284] In an eighth aspect, the present disclosure provides a device for obtaining a timing advance, the device comprising:

[0285] A receiving module, configured to receive a message 1 sent by a terminal device based on a spatial filter, wherein the message 1 includes a preamble, the preamble is used to determine 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, to receive a channel sounding reference signal sent by the terminal device based on a spatial filter, wherein 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;

[0286] A sending module is used to send a response message to the second network device; wherein the response message includes a timing advance, and the response message is used to feed back to the terminal device.

[0287] In a ninth aspect, the present disclosure provides a device for obtaining a timing advance, the device comprising:

[0288] A first sending module, configured to send first indication information to a terminal device; wherein the first indication information is used to indicate a channel sounding reference signal associated with message 1;

[0289] 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, where the message 1 includes a preamble code, the preamble code 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, where the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter;

[0290] The first receiving module is used to receive a response message sent by the first network device and send the response message to the terminal device; wherein the response message includes a timing advance.

[0291] In a tenth aspect, the present disclosure provides a processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, and the computer program is used to enable a processor to execute the method of any one of the first aspect, the second aspect, or the third aspect.

[0292] The present disclosure provides a method, device and storage medium for obtaining a timing advance, which can be implemented for a UL-only TRP scenario (S-DCI based multi-TRP transmission). When there is no downlink communication link between a network device and a terminal device, in the process of obtaining TA, the spatial filter used when sending a message in a random access process to a network device is determined, so that the terminal device can send a message in a random access process to the network device, and the terminal device can obtain the TA; and can also be implemented for a UL-only TRP scenario (S-DCI based multi-TRP transmission). When there is no downlink communication link between a network device and a terminal device, in the process of obtaining TA, the spatial filter used when sending a message in a random access process to a network device and the transmission power used when sending a message in a random access process to a network device are determined, so that the terminal device can send a message in a random access process to the network device, and the terminal device can obtain the TA.

[0293] It should be understood that the contents described in the above summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easier to understand through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0294] In order to more clearly illustrate the technical solutions in the present disclosure or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0295] FIG1 is a scene diagram provided by the present disclosure;

[0296] FIG2 is a flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0297] FIG3 is a schematic flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0298] FIG4 is a schematic diagram 1 of a spatial filter provided by the present disclosure;

[0299] FIG5 is a flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0300] FIG6 is a second schematic diagram of a spatial filter provided by the present disclosure;

[0301] FIG7 is a flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0302] FIG8 is a flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0303] FIG9 is a flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0304] FIG10 is a schematic diagram of a signaling interaction flow of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0305] FIG11 is a schematic diagram of a signaling interaction flow of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0306] FIG12 is a schematic diagram of a signaling interaction flow of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0307] FIG13 is a schematic diagram of a signaling interaction flow of a method for obtaining a timing advance provided in an embodiment of the present disclosure;

[0308] FIG14 is a schematic diagram of a signaling interaction flow of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0309] FIG15 is a schematic structural diagram of a device for obtaining a timing advance according to an embodiment of the present disclosure;

[0310] FIG16 is a schematic structural diagram of a device for obtaining a timing advance according to an embodiment of the present disclosure;

[0311] FIG17 is a schematic structural diagram of a device for obtaining a timing advance according to an embodiment of the present disclosure;

[0312] FIG18 is a schematic structural diagram of a device for obtaining a timing advance according to an embodiment of the present disclosure;

[0313] FIG19 is a schematic structural diagram of a device for obtaining a timing advance according to an embodiment of the present disclosure;

[0314] FIG20 is a schematic structural diagram of a device for obtaining a timing advance provided in an embodiment of the present disclosure.

[0315] Implementation Method

[0316] In the embodiments of the present disclosure, the term "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0317] In the embodiments of the present disclosure, the term "plurality" refers to two or more than two, and other quantifiers are similar thereto.

[0318] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure and not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0319] In order to clearly understand the technical solution of the present disclosure, the terms involved in the embodiments of the present disclosure are first defined:

[0320] 5G: 5th Generation Mobile Communication Technology, fifth generation mobile communication technology.

[0321] UE: User Equipment.

[0322] TA: Timing Advance, timing advance.

[0323] SRS: Sounding Reference Signal, channel detection reference signal.

[0324] SSB: Synchronization Signal / PBCH Block, synchronization signal block

[0325] TPR: Transmission and Receiving Point, receiving point / transmission point.

[0326] UL: Up Link, uplink.

[0327] RACH: Random Access Channel.

[0328] RACH-less: Random Access Channel less, no random access required.

[0329] PRACH: Physical Random Access Channel, physical random access channel.

[0330] PDCCH: Physical Downlink Control Channel, physical downlink control channel.

[0331] PUSCH: Physical Uplink Shared Channel, physical uplink shared channel.

[0332] PUCCH: Physical Uplink Control Channel, physical uplink control channel.

[0333] DCI: Downlink Control Information, downlink control information.

[0334] RRC: Radio Resource Control, radio resource control / radio resource control protocol.

[0335] ID: Identity document, ID number, account number, unique code, exclusive number;

[0336] RSRP: Reference Signal Receiving Power, reference signal receiving power.

[0337] The technical solution provided by the embodiment of the present disclosure can be applicable to a variety of systems, especially 5G systems. For example, the applicable system can be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, a long term evolution (LTE) system, a LTE frequency division duplex (FDD) system, a LTE time division duplex (TDD) system, an advanced long term evolution (LTE-A) system, a universal mobile telecommunication system (UMTS), a world-wide interoperability for microwave access (WiMAX) system, a 5G new air interface (NR) system, etc. These various systems include terminal equipment and network equipment. The system may also include a core network part, such as an evolved packet system (EPS), a 5G system (5GS), etc.

[0338] The terminal device involved in the embodiments of the present disclosure may be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connection function, or other processing device connected to a wireless modem. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device may be called User Equipment (UE). A wireless terminal device may be a USB storage device, other personal computer memory devices, and a dongle. It may also communicate with one or more core networks (CN) via a radio access network (RAN). A wireless terminal device may be a mobile terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device. For example, it may be a portable, pocket-sized, handheld, computer-built-in, or vehicle-mounted mobile device that exchanges language and / or data with a 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 (PDAs), personal computers, tablet computers, Machine-type Communication (MTC) terminal devices, etc. Wireless terminal devices may also be referred to as systems, subscriber units, subscriber stations, mobile stations, mobile stations, remote stations, access points, remote terminal devices, access terminal devices, user terminal devices, user agents, user devices, and wireless access points and routers / modems that meet the limitations of this definition, but are not limited in the embodiments of the present disclosure.

[0339] The network device involved in the embodiments of the present disclosure may be a base station, which may include multiple cells providing services to the terminal. Depending on the application scenario, the base station may also be called an access point, or may be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present disclosure may be an evolved network device (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation 5G network architecture, etc., or a home evolved Node B (HeNB), a relay node, a femto, a pico base station, a network test device, etc., which is not limited in the embodiments of the present disclosure. In some network structures, network devices may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and the distributed unit may also be arranged geographically separately.

[0340] Network devices and terminal devices can each use one or more antennas for multiple-input, multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO or multi-user MIMO. Depending on the configuration and number of antennas, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO. It can also employ diversity transmission, precoding, or beamforming.

[0341] The terminal device in the embodiment of the present disclosure sends relevant information or similar descriptions to the network side device, which only indicates that the terminal device sends the relevant information in the form of a wireless signal, and its intended recipient is the network device. The network device can obtain the relevant information by receiving the wireless signal.

[0342] The following describes the embodiments of the present disclosure in detail using a 5G system scenario as an example.

[0343] In a scenario where multiple downlink control information is based on multiple transmission points (multi-DCI based multi-TRP), there are multiple network devices, for example, the network device is a TRP.

[0344] For example, in a multi-DCI based multi-TRP scenario, two network devices are included, 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 uplink communication and downlink communication between the terminal device and the second network device.

[0345] The second network device sends first downlink control information (i.e., PDCCH order information) to the terminal device, where 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 of a random access process to the first network device; then the terminal device sends a message of a random access process to the first network device based on a spatial filter (e.g., sending message 1), where the spatial filter is a spatial filter for receiving a synchronization signal block indicated by the PDCCH order information. The first network device feeds back a timing advance (TA) to the terminal device.

[0346] Alternatively, the first network device sends first downlink control information (i.e., PDCCH order information) to the terminal device, where 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 of a random access process to the first network device; then the terminal device sends a message of a random access process to the first network device based on a spatial filter (e.g., sending message 1), where the spatial filter is a spatial filter for receiving PDCCH order information. The first network device feeds back a TA to the terminal device.

[0347] For example, the first network device is TPR1, and the second network device is TPR2. TPR2 sends PDCCH order information to the terminal device, where the PDCCH order information is carried by downlink control information DCI format 1_0. The PDCCH order information is used to instruct the terminal device to send a random access process message to TPR1. The terminal device then sends a random access process message (for example, message 1) to TPR1 based on a spatial filter, where the spatial filter is a spatial filter for receiving the synchronization signal block indicated by the PDCCH order information. TPR1 provides feedback TA to the terminal device.

[0348] Alternatively, TPR1 sends first downlink control information (i.e., PDCCH order information) to the terminal device, where 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 random access process message to TPR1; then the terminal device sends a random access process message to TPR1 (e.g., sending message 1) based on a spatial filter, where the spatial filter is a spatial filter for receiving PDCCH order information (PDCCH order DM RS). TPR1 feeds back TA to the terminal device.

[0349] 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, so that the terminal device can send messages in the random access process to the network device, and then the network device feeds back TA to the terminal device.

[0350] However, during the communication between the terminal device and the network device, there is often a situation where there is no downlink communication link between the terminal device and the network device (ie, a UL-only TRP scenario).

[0351] 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 feedbacking the signaling during the random access process, resulting in the terminal device being unable to send signaling during the random access process to the network device, resulting in the terminal device being unable to obtain the TA.

[0352] Figure 1 illustrates a scenario provided by the present disclosure. As shown in Figure 1 , for a UL-only TRP scenario (S-DCI based multi-TRP transmission), some network devices and terminal devices lack a downlink communication link. As shown in Figure 1 , there are a first network device 01, a second network device 02, and a terminal device 03. There is both an uplink and a downlink communication link between second network device 02 and terminal device 03; however, there is only an uplink communication link between first network device 01 and terminal device 03, with 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; thus, the terminal device cannot send a message in the random access process to the first network device 01 through the spatial filter used to receive the SSB indicated by the PDCCH order information, or the terminal device cannot send a message in the random access process to the first network device 01 through the spatial filter indicated by the PDCCH order information sent by the first network device 01.

[0353] Therefore, 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, in the process of obtaining the TA, the spatial filter used when sending messages in the random access process to the network device is determined, so that the terminal device can send messages in the random access process to the network device, and the terminal device can obtain the TA.

[0354] 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, in 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, as well as the transmission power 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.

[0355] Figure 2 is a flow chart of a method for obtaining a timing advance provided by an embodiment of the present disclosure. As shown in Figure 2, an embodiment of the present disclosure provides a method for obtaining a timing advance, which can be applied to a terminal device in the aforementioned 5G system structure to implement, for UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in 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 UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in 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. The method provided in this embodiment includes the following steps:

[0356] Step 201: A terminal device sends a message 1 to a first network device based on a spatial filter, wherein the message 1 includes a preamble code used to determine a timing advance. The spatial filter is a spatial filter corresponding to a channel sounding reference signal.

[0357] 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.

[0358] 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 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 transmission of Message 1 in the PRACH process.

[0359] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0360] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0361] 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, the spatial filter used by the terminal device when sending message 1 to the first network device is the spatial filter corresponding to the synchronization signal block with the best reference signal received power (RSRP) when receiving the synchronization signal block (SSB). Alternatively, the spatial filter used by the terminal device when sending message 1 to the first network device may be any one of 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 set of spatial filters.

[0362] Thus, multiple spatial filter selection methods 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 from a preset set of spatial filters. This facilitates the terminal device to send messages in the random access process to the first network device based on the spatial filter.

[0363] In this embodiment, priority may be given to using the spatial filter corresponding to the channel sounding reference signal (SRS) associated with message 1.

[0364] In some embodiments, the spatial filter corresponding to the channel sounding reference signal (SRS) is: a spatial filter corresponding to transmission indication status information related to the channel sounding reference signal.

[0365] In some embodiments, the transmission indication state information related to the channel sounding reference signal (SRS) includes any one of the following: uplink transmission indication state information (UL TCI state), joint transmission indication state information (joint TCI state), unified transmission indication state information (unified TCI state), etc.

[0366] In some embodiments, when the spatial filter is a spatial filter corresponding to the transmission indication status information related to the channel sounding reference signal, the spatial filter is any one of the following:

[0367] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0368] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0369] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0370] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0371] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0372] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0373] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0374] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0375] In this embodiment, the spatial filter used may be a spatial filter for sending a channel sounding reference signal (SRS) included in uplink transmission indication state 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.

[0376] Alternatively, the spatial filter used may be a spatial filter for receiving a synchronization signal block (SSB) included in the uplink transmission indication state 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 may send a downlink signal to the terminal device.

[0377] Alternatively, the spatial filter used may be a spatial filter for receiving a synchronization signal block (SSB) included in the joint transmission indication state 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 may send a downlink signal to the terminal device.

[0378] Alternatively, for the scenario where SRS does not follow the unified transmission indication state 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 state information (srs-TCI-State-r17) of the channel sounding reference signal.

[0379] Alternatively, the spatial filter used may 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.

[0380] Alternatively, the spatial filter used may be a predefined spatial filter. For example, in the scenario where the SRS does not follow the unified transmission indication state information (SRS does not follow unified TCI state) and SRS-TCI-State-r17 is not configured for this SRS, the terminal device uses the predefined spatial filter corresponding to the SRS.

[0381] Regarding "the spatial filter used may be a predefined spatial filter", the following situations may be included:

[0382] The spatial filter used may be the spatial filter indicated by the transmission indication state information (TCI state) with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool (joint TCI state pool). The joint transmission indication state information pool (joint TCI state pool) is pre-configured for the terminal device; or, the joint transmission indication state information pool (joint TCI state pool) is activated through a MAC CE message. Each TCI state in the state information pool has a unique identifier (ID), which are usually integers and are arranged in a certain order. For example, the TCI state in the state information pool is identified as {0, 1, 2, 3}, then the TCI state with the smallest identifier is the TCI state corresponding to ID 0. In some embodiments, the TCI state with the smallest identifier may be the default or initial state of the TCL.

[0383] Alternatively, the spatial filter used may be the spatial filter indicated by the transmission indication state information (TCI state) with the smallest identifier in a state information pool, wherein the state information pool is an uplink transmission indication state information pool (UL TCI state pool). The uplink transmission indication state information pool (UL TCI state pool) is pre-configured for the terminal device; or the uplink transmission indication state information pool (UL TCI state pool) is activated through a MAC CE message.

[0384] Alternatively, the spatial filter used may be the spatial filter indicated by the unified transmission indication state information (unified TCI state) most recently sent by the second network device.

[0385] Alternatively, the spatial filter used may be the spatial filter indicated by the uplink transmission indication state information (UL TCI state) most recently sent by the second network device.

[0386] In this embodiment, any one of the above-mentioned spatial filters may be considered for use.

[0387] In addition, the spatial filter used may also 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).

[0388] Therefore, in this embodiment, a variety of spatial filter selection methods are provided to facilitate the terminal device to send messages in the random access process to the first network device based on the spatial filter, thereby allowing the terminal device to obtain the TA.

[0389] In some embodiments, before step 201, the following steps are also included: the terminal device receives first indication information sent by the second network device; wherein the first indication information is used to indicate a channel sounding reference signal associated with message 1.

[0390] In one example, the implementation of “the terminal device receiving the first indication information sent by the second network device” is as follows:

[0391] The terminal device receives first downlink control information sent by the second network device; wherein the first downlink control information includes first indication information.

[0392] Alternatively, the terminal device receives a first wireless resource control message sent by the second network device; wherein the first wireless resource control message includes first indication information.

[0393] Alternatively, the terminal device receives a first media access control message sent by the second network device; wherein the first media access control message includes first indication information.

[0394] 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.

[0395] In step S201 above, 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 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 transmission of Message 1 in the PRACH process.

[0396] 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 a spatial filter corresponding to the channel sounding reference signal (SRS), the terminal device needs to obtain the SRS associated with message 1.

[0397] Therefore, the second network device needs to send first indication information to the terminal device, where the first indication information is used to indicate the SRS associated with message 1. The terminal device can then determine the SRS associated with message 1 based on the first indication information, and can then 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).

[0398] The first indication information can be carried by the following messages: first downlink control information (PDCCH order information), a first radio resource control (RRC) message, and a first media access control (MAC CE) message. The second network device can then inform the terminal device of the first indication information in a variety of ways, so that the terminal device can determine the SRS associated with message 1, and further 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).

[0399] It can be seen that the second network device needs to send first downlink control information (i.e., PDCCH order information) to the terminal device, and the PDCCH order information includes the first indication information. Alternatively, the second network device needs to send a first radio resource control message to the terminal device, and the first radio resource control message includes the first indication information. Alternatively, the second network device needs to send a first media access control message to the terminal device, and the first media access control message includes the first indication information.

[0400] In one method, 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 channel sounding reference signal (SRS), the terminal device needs to obtain the SRS associated with message 1; and then needs to establish an association between the SRS and message 1, and this association relationship can be indicated to the terminal device by the second network device.

[0401] For example, a second network device sends first downlink control information (i.e., PDCCH order information) to a terminal device. The PDCCH order information includes first indication information, namely, an SRS ID indicator. The first indication information indicates an SRS. After the terminal device receives the PDCCH order information sent by the second network device, the terminal device sends message 1 to the first network device based on the spatial filter of the SRS indicated by the first indication information (SRS ID indicator) in the PDCCH order information.

[0402] In another embodiment, 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 channel sounding reference signal (SRS), the terminal device needs to obtain the SRS associated with message 1; and then the second network device needs to instruct the terminal device which SRS empty filter to use.

[0403] For example, the second network device sends a first RRC message to the terminal device, where the first RRC message has first indication information, and the first indication information indicates the SRS associated with message 1. After the terminal device receives the first RRC message sent by the second network device, the terminal device sends message 1 to the first network device based on the spatial filter of the SRS indicated by the first indication information in the first RRC message.

[0404] Alternatively, the second network device sends a first MAC CE message to the terminal device, where the first MAC CE message has first indication information, and the first indication information indicates the SRS associated with message 1. After the terminal device receives the first MAC CE message sent by the second network device, the terminal device sends message 1 to the first network device based on the spatial filter of the SRS indicated by the first indication information in the first MAC CE message.

[0405] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0406] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0407] In some embodiments, before step 201, the following steps are also included: the terminal device receives 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0408] In one example, the implementation of “receiving the fifth indication information sent by the second network device” is as follows:

[0409] Receive second downlink control information sent by the second network device; wherein the second downlink control information includes fifth indication information.

[0410] Alternatively, a higher layer signaling sent by the second network device is received; wherein the higher layer signaling includes the fifth indication information.

[0411] In this embodiment, when the terminal device sends message 1 to the first network device, it also needs to determine the transmission power of message 1. Then, the terminal device sends message 1 to the first network device according to the transmission power of message 1 and the spatial filter.

[0412] The transmit power for sending Message 1 is the minimum of the following: the maximum transmit power of the terminal device and a second preset power. The second preset power is the sum of the target receive power for Message 1 and the path loss power at the uplink receive-only point. The path loss power at the uplink receive-only 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. The path loss power at the uplink receive-only point needs to be indicated to the terminal device by the second network device.

[0413] For example, the transmission power of 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 transmit power of the terminal device. P PRACH,target,f,c is the target received power of message 1. PL b,f,c,uplink PL is the path loss power of the uplink-only-TRP. b,f,c,uplink It can be determined using an uplink reference signal (e.g., SRS). b represents the bandwidth; f represents the frequency band; c represents the CC; and i represents the i-th transmission opportunity.

[0414] Among them, the uplink path loss power PL of the receiving point is b,f,c,uplink = SRS-RSRP – SRS_configured_power. Where SRS_configured_power is the transmit power configured for the channel sounding reference signal (SRS). SRS-RSRP is the receive power configured for the channel sounding reference signal (SRS), that is, SRS-RSRP is the receive power of the SRS when the transmit power of the SRS is SRS_configured_power. b,f,c,uplink After the second network device calculates the path loss power at the receiving point, the second network device indicates the path loss power at the receiving point to the terminal device.

[0415] Alternatively, the transmit power for sending Message 1 is the minimum of the following powers: the maximum transmit power of the terminal device and a second preset power; wherein the second preset power is the sum of the target receive power of Message 1 and the path loss power at the uplink receive point only. The path loss power at the uplink receive point only 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. The uplink receive signal power difference needs to be indicated to the terminal device by the second network device.

[0416] For example, the transmission power of 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 transmit power of the terminal device. P PRACH,target,f,c is the target received 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, and i represents the i-th transmission opportunity.

[0417] Among them, the uplink path loss power PL of the receiving point is b,f,c,uplink =PL1+deltauplink_pathloss. Among them, PL1 is the downlink path loss power of the second network device estimated by the terminal device. deltauplink_pathloss is the uplink received signal power difference, and the uplink received signal power difference deltauplink_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, 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 the value of deltauplink_pathloss is 0, it means 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, after the uplink received signal power difference deltauplink_pathloss is calculated by the second network device, the second network device indicates the path loss power of the uplink receiving point to the terminal device.

[0418] Alternatively, the transmit power for sending message 1 is the minimum of the following powers: the maximum transmit power of the terminal device and a second preset power; wherein the second preset power is the sum of the target receive power of message 1 and the path loss power of the uplink receive point only. The path loss power of the uplink receive point only is the sum of the downlink path loss power of the second network device and the path loss offset power of the first network device and the second network device.

[0419] For example, the transmission power of 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 transmit power of the terminal device. P PRACH,target,f,c is the target received power of message 1. PL b,f,c,uplink is the path loss power at the uplink-only receiving point (TRP). b represents the bandwidth; f represents the frequency band; c represents the CC; and i represents the i-th transmission opportunity.

[0420] Among them, the uplink path loss power PL of the receiving point is b,f,c,uplink =PL1+PL offset PL1 is the downlink path loss power of the second network device estimated by the terminal device. offset is the path loss offset power between the first network device and the second network device.

[0421] In one example, the path loss offset power may be indicated to the terminal device by at least one of the first network device or the second network device. The first network device or the second network device may send the path loss offset power of the first network device and the second network device to the terminal device via a radio resource control (RRC) message.

[0422] In another example, the path loss offset power of the first network device and the second network device can be indicated by a state information pool, where the state information pool is a joint transmission indication state information pool (joint TCI state pool) or an uplink transmission indication state information pool (UL TCI state pool). The state information pool is pre-configured for the terminal device; or the state information pool is activated through a MAC CE message.

[0423] Therefore, 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.

[0424] It can be seen that the second network device needs to send the path loss power of the uplink receiving point only or the uplink received signal power difference to the terminal device in advance. The second network device can send fifth indication information to the terminal device; wherein the fifth indication information is used to indicate the path loss power of the uplink receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference. Thus, the terminal device determines the transmit power of message 1 based on the path loss power of the uplink receiving point only, and sends message 1 to the first network device. Alternatively, the terminal device determines the transmit power of message 1 based on the uplink received signal power difference, and sends message 1 to the first network device.

[0425] The fifth indication information may be a separate signaling, or the fifth indication information may be carried by higher layer signaling, or the fifth indication information may be carried by downlink control information.

[0426] Thus, the second network device sends second downlink control information to the terminal device, wherein the second downlink control information includes the fifth indication information. Alternatively, the second network device sends 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.

[0427] Thus, multiple indication methods for indicating the uplink path loss power at the receiving point only or the uplink received signal power difference are provided. The fifth indication information can be a separate signaling, or the fifth indication information can be carried by higher-layer signaling, or the fifth indication information can be carried by downlink control information. This allows the terminal device to determine the transmit power of message 1 based on the uplink path loss power at the receiving point only or the uplink received signal power difference, so as to send message 1 to the first network device.

[0428] Step 202: 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.

[0429] In this embodiment, after the first network device receives Message 1 sent by the terminal device, it determines the TA based on the preamble in Message 1. The first network device then sends a response message to the second network device, which includes the TA. The second network device then sends the response message including the TA to the terminal device.

[0430] Then the terminal device obtains the TA.

[0431] In this embodiment, the terminal device sends message 1 to the first network device based on a spatial filter, wherein the message 1 includes a preamble code; wherein the spatial filter is a spatial filter corresponding to the channel sounding reference signal. 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 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, in the process of obtaining 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 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, in the process of obtaining the TA, the spatial filter used when sending the message 1 in the random access process to the network device is determined, and the transmission power 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 1 in the random access process to the network device, and the terminal device can obtain the TA.

[0432] Figure 3 is a flow chart of a method for obtaining a timing advance provided by an embodiment of the present disclosure. As shown in Figure 3, an embodiment of the present disclosure provides a method for obtaining a timing advance, which can be applied to a terminal device in the aforementioned 5G system structure to implement, for UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in 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 UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in 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. The method provided in this embodiment includes the following steps:

[0433] Step 301: The terminal device sends a message 1 to a first network device based on a spatial filter, wherein the message 1 includes a preamble code used to determine a timing advance. The spatial filter is a specified spatial filter.

[0434] 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.

[0435] The spatial filter (i.e., beam) used by the terminal device when sending Message 1 to the first network device is the 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 transmission of Message 1 in the PRACH process.

[0436] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0437] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0438] 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, the spatial filter used by the terminal device when sending message 1 to the first network device is the spatial filter corresponding to the synchronization signal block with the best reference signal received power (RSRP) when receiving the synchronization signal block (SSB). Alternatively, the spatial filter used by the terminal device when sending message 1 to the first network device may be any one of 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 set of spatial filters.

[0439] Thus, multiple spatial filter selection methods 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 from a preset set of spatial filters. This facilitates the terminal device to send messages in the random access process to the first network device based on the spatial filter.

[0440] In this embodiment, priority may be given to using a designated spatial filter.

[0441] This embodiment is aimed at the scenario of RACH-based TA acquisition.

[0442] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0443] The spatial filter is a spatial filter used to send the channel sounding reference signal included in the uplink transmission indication status information.

[0444] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0445] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0446] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0447] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0448] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0449] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0450] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0451] In this embodiment, the spatial filter refers to the introduction of the embodiment shown in FIG2 .

[0452] In some embodiments, before step 301, the following steps are also included: the terminal device receives second indication information sent by the second network device; wherein the second indication information is used to indicate the number of repeated transmissions of message 1.

[0453] In one example, the implementation of “the terminal device receiving the second indication information sent by the second network device” is as follows:

[0454] The terminal device receives a second wireless resource control message sent by the second network device; wherein the second wireless resource control message includes second indication information.

[0455] Alternatively, the terminal device receives a second media access control message sent by the second network device; wherein the second media access control message includes second indication information.

[0456] 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.

[0457] In step S201 above, the terminal device uses a designated spatial filter (i.e., beam) when sending Message 1 to the first network device. Furthermore, the terminal device can use the designated 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 designated spatial filter to complete the transmission of Message 1 during the PRACH process.

[0458] The transmission direction of the specified spatial filter is determined by the terminal device itself. The specified spatial filter may be the spatial filter corresponding to the synchronization signal block with the optimal reference signal received power (RSRP) when receiving a 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.

[0459] This embodiment is aimed at the scenario of RACH-based TA acquisition.

[0460] FIG4 is a schematic diagram of a spatial filter provided by the present disclosure. As shown in FIG4 , a terminal device uses a fixed spatial filter (e.g., a spatial filter corresponding to a synchronization signal block with optimal reference signal received power) to send message 1 to a first network device. The fixed spatial filter is represented by a black beam in FIG4 .

[0461] Furthermore, the second network device needs to indicate the number of repetitions of Message 1. The second network device sends second indication information to the terminal device, where the second indication information is used to indicate the number of repetitions of Message 1. Furthermore, the terminal device uses a fixed spatial filter to send Message 1 to the first network device based on the number of repetitions indicated by the second indication information.

[0462] The second indication information may be carried by the following messages: a second radio resource control (RRC) message, a second media access control (MAC CE) message. Furthermore, the second network device may notify the terminal device of the second indication information in a variety of ways, so that the terminal device sends message 1 to the first network device using a fixed spatial filter based on the number of repetitions indicated by the second indication information.

[0463] For example, the second network device needs to send a second radio resource control message to the terminal device, wherein the second radio resource control message includes the second indication information. Alternatively, the second network device needs to send a second media access control message to the terminal device, wherein the second media access control message includes the second indication information.

[0464] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0465] For example, the path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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; 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.

[0466] In some embodiments, before step 201, the following steps are also included: the terminal device receives 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0467] In one example, “the terminal device receives the fifth indication information sent by the second network device” is implemented as follows:

[0468] The terminal device receives the second downlink control information sent by the second network device; wherein the second downlink control information includes the fifth indication information.

[0469] Alternatively, the terminal device receives high-layer signaling sent by the second network device; wherein the high-layer signaling includes the fifth indication information.

[0470] In this embodiment, the transmission power of sending message 1 refers to the introduction of the embodiment shown in FIG. 2 .

[0471] Step 302: 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.

[0472] In this embodiment, the first network device receives Message 1 sent by the terminal device using different spatial filters. The first network device then determines the TA based on the preamble in Message 1. The first network device then sends a response message to the second network device, including the TA. The second network device then sends the response message, including the TA, to the terminal device.

[0473] Then the terminal device obtains the TA.

[0474] In this embodiment, the terminal device sends message 1 to the first network device based on a spatial filter, wherein the message 1 includes a preamble code; wherein 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, in the process of obtaining 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 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, in the process of obtaining the TA, the spatial filter used when sending the message 1 in the random access process to the network device is determined, and the transmission power 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 1 in the random access process to the network device, and the terminal device can obtain the TA.

[0475] Figure 5 is a flow chart of a method for obtaining a timing advance provided by an embodiment of the present disclosure. As shown in Figure 5, an embodiment of the present disclosure provides a method for obtaining a timing advance, which can be applied to a terminal device in the aforementioned 5G system structure to implement, for UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in 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 UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in 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. The method provided in this embodiment includes the following steps:

[0476] Step 501: A terminal device sends a message 1 to a first network device based on a spatial filter, wherein the message 1 includes a preamble code used to determine a timing advance. The spatial filter is a specified spatial filter.

[0477] 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.

[0478] 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 any one of 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 from a preset set of spatial filters.

[0479] Furthermore, the terminal device can use a spatial filter in a preset spatial filter combination to send message 1 to the first network device, wherein message 1 includes a preamble. That is, the terminal device can use a specified spatial filter to complete sending message 1 in the PRACH process.

[0480] This embodiment is aimed at the scenario of RACH-based TA acquisition.

[0481] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0482] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0483] 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, the spatial filter used by the terminal device when sending message 1 to the first network device is the spatial filter corresponding to the synchronization signal block with the best reference signal received power (RSRP) when receiving the synchronization signal block (SSB). Alternatively, the spatial filter used by the terminal device when sending message 1 to the first network device may be any one of 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 set of spatial filters.

[0484] Thus, multiple spatial filter selection methods 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 from a preset set of spatial filters. This facilitates the terminal device to send messages in the random access process to the first network device based on the spatial filter.

[0485] In this embodiment, the transmit power for sending Message 1 is described in the embodiment shown in FIG2 . In this embodiment, it may be preferred to use a preset spatial filter combination including multiple spatial filters. Thus, the first network device transmits Message 1 during the random access process to the second network device based on each spatial filter in the set of spatial filters.

[0486] Figure 6 is a second schematic diagram of a spatial filter provided by the present disclosure. As shown in Figure 6, a terminal device uses each spatial filter in a set of spatial filters to send message 1 during a random access process to a first network device. As shown in Figure 6, each spatial filter in the set of spatial filters is sent in time slot n, time slot n+1, time slot n+2, ..., time slot n+m; n and m are both positive integers greater than or equal to 1.

[0487] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0488] The spatial filter is a spatial filter used to send the channel sounding reference signal included in the uplink transmission indication status information.

[0489] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0490] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0491] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0492] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0493] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0494] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0495] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0496] In this embodiment, the spatial filter refers to the introduction of the embodiment shown in FIG2 .

[0497] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0498] For example, the path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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; 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.

[0499] In some embodiments, before step 501, the following steps are also included: the terminal device receives 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0500] In one example, “the terminal device receives the fifth indication information sent by the second network device” is implemented as follows:

[0501] The terminal device receives the second downlink control information sent by the second network device; wherein the second downlink control information includes the fifth indication information.

[0502] Alternatively, the terminal device receives high-layer signaling sent by the second network device; wherein the high-layer signaling includes the fifth indication information.

[0503] In this embodiment, the transmission power of sending message 1 is as described in the embodiment shown in FIG. 2 .

[0504] Step 502: 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.

[0505] In this embodiment, the terminal device sends message 1 in the random access process to the first network device based on each spatial filter in a set of spatial filters.

[0506] The first network device uses a spatial filter to receive Message 1 sent by the terminal device. The first network device determines the TA based on the preamble in Message 1. The first network device then sends a response message to the second network device, including the TA. The second network device then sends the response message, including the TA, to the terminal device.

[0507] Then the terminal device obtains the TA.

[0508] Step 503: The terminal device receives the sixth indication information sent by the second network device; wherein the sixth indication information is used to indicate the spatial filter with the best performance; the terminal device sends message 3 to the first network device based on the spatial filter indicated by the sixth indication information.

[0509] In this embodiment, after "the terminal device sends message 1 in a random access process to the first network device based on each spatial filter in a set of spatial filters. The first network device receives message 1 sent by the terminal device using a certain spatial filter," the first network device determines the optimal spatial filter in the set of spatial filters. The first network device then sends sixth indication information to the terminal device via the second network device; the sixth indication information is used to indicate the optimal spatial filter. For example, the first network device sends a RAR MAC PDU message via the second network device, and the RAR MAC PDU message includes the sixth indication information.

[0510] Thus, the terminal device sends message 3 to the first network device based on the spatial filter indicated by the sixth indication information.

[0511] 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 spatial filter with the best performance; it is convenient for the terminal device to directly determine the spatial filter with the best 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 best performance.

[0512] In this embodiment, the terminal device sends message 1 to the first network device based on a spatial filter, wherein the message 1 includes a preamble code; wherein the spatial filter is a spatial filter in a group 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 group 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, in the process of obtaining 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 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, in the process of obtaining the TA, the spatial filter used when sending the message 1 in the random access process to the network device is determined, and the transmission power 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 1 in the random access process to the network device, and the terminal device can obtain the TA.

[0513] Figure 7 is a flow chart of a method for obtaining a timing advance provided by an embodiment of the present disclosure. As shown in Figure 7, an embodiment of the present disclosure provides a method for obtaining a timing advance, which can be applied to a terminal device in the aforementioned 5G system structure to implement, for UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in 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 UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in 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. The method provided in this embodiment includes the following steps:

[0514] Step 701: A terminal device sends a channel sounding reference signal to a first network 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 the channel sounding reference signal, or a specified spatial filter.

[0515] 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.

[0516] 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 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 transmission of the SRS in the PRACH process.

[0517] 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 set 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 transmission of the SRS in the PRACH process.

[0518] This embodiment targets the scenario of RACH-less based TA acquisition.

[0519] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0520] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0521] In this embodiment, the spatial filter used when the terminal device sends the SRS 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 when the terminal device sends the SRS to the first network device may be a fixed spatial filter; for example, the spatial filter used when the terminal device sends the SRS to the first network device is the spatial filter corresponding to the synchronization signal block with the best reference signal received power (RSRP) when receiving the synchronization signal block (SSB). Alternatively, the spatial filter used when the terminal device sends the SRS to the first network device may be any one of the spatial filters in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters; for example, the spatial filter used when the terminal device sends the SRS to the first network device is a spatial filter in a preset set of spatial filters.

[0522] Thus, multiple spatial filter selection methods 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 from a preset set of spatial filters. This facilitates the terminal device to send messages in the random access process to the first network device based on the spatial filter.

[0523] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0524] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0525] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0526] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0527] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0528] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0529] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0530] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0531] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0532] In this embodiment, the spatial filter can be referred to the introduction of FIG. 2 .

[0533] In addition, for the SRS resource set follow scenario, the spatial filter used may be the spatial filter indicated by the joint transmission indication state information table (dl-OrJointTCI-StateList).

[0534] Alternatively, for the SRS resource set follow scenario, the spatial filter used may be the spatial filter indicated by the transmission indication-uplink-state information (TCI-UL-State).

[0535] Alternatively, for the scenario where the SRS resource set is not followed, the spatial filter used may 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.

[0536] Alternatively, for the scenario where the SRS resource set is not followed, the spatial filter used may 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.

[0537] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0538] The transmission power difference is a 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.

[0539] 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 transmission power of the physical uplink shared channel of the terminal device.

[0540] In some embodiments, before step S701, the method further includes: the terminal device receives fourth indication information sent by the second network device; wherein the fourth indication information is used to indicate a transmission power difference.

[0541] The implementation of “the terminal device receiving the fourth indication information sent by the second network device” is as follows:

[0542] The terminal device receives first downlink control information sent by the second network device, wherein the first downlink control information includes fourth indication information.

[0543] Alternatively, the terminal device receives a fourth wireless resource control message sent by the second network device; wherein the fourth wireless resource control message includes fourth indication information.

[0544] 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.

[0545] In this embodiment, when the terminal device sends the SRS to the first network device, it also needs to determine the transmission power of the SRS. Then, the terminal device sends the SRS to the first network device according to the transmission power of the SRS and the spatial filter.

[0546] Among them, the transmission power of the channel detection reference signal is the minimum value of the following powers: the maximum transmission power of the terminal device and the first preset power; among them, the first preset power is the sum of the power value and the transmission power difference.

[0547] The transmission power difference is a 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.

[0548] 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 transmission power of the physical uplink shared channel of the terminal device.

[0549] For example, the transmission power of SRS is:

[0550] Among them, P CMAX,f,c (i) is the maximum transmit power of the terminal device. The power value is is the transmit power difference. The received power of the channel sounding reference signal configured for the network device. M SRS,b,f,c (i) is the transmission bandwidth of the channel sounding reference signal. 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 physical uplink shared channel transmit power of the terminal device. b represents the bandwidth; f represents the frequency band; c represents the CC. i represents the i-th transmission opportunity.

[0551] Therefore, 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.

[0552] It can be seen that the second network device needs to send the transmit power difference to the terminal device in advance. The second network device can send fourth indication information to the terminal device; the fourth indication information is used to indicate the transmit power difference. Therefore, the terminal device determines the transmit power of the SRS based on the transmit power difference and sends the SRS to the first network device.

[0553] The fourth indication information may be a separate signaling, or the fourth indication information may be carried by higher layer signaling, or the fourth indication information may be carried by downlink control information.

[0554] Thus, the second network device sends first downlink control information to the terminal device, where the first downlink control information includes the fourth indication information. Alternatively, the second network device sends a fourth radio resource control message to the terminal device, where the fourth radio resource control message includes the fourth indication information. Alternatively, the second network device sends a fourth media access control message to the terminal device, where the fourth media access control message includes the fourth indication information.

[0555] The first downlink control information may be DCI format 0_1.

[0556] Thus, 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 can be carried by higher-layer signaling, or the fourth indication information can be carried by downlink control information. This allows the terminal device to determine the transmit power of the SRS based on the transmit power difference and send the SRS to the first network device.

[0557] In some embodiments, the configuration information of the channel sounding reference signal indicates a time domain resource for sending the channel sounding reference signal.

[0558] Alternatively, before step S701, the method further includes: the terminal device receives 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.

[0559] In one example, the implementation of “the terminal device receiving the third indication information sent by the second network device” is as follows:

[0560] The terminal device receives first downlink control information sent by the 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 the third indication information.

[0561] Alternatively, the terminal device receives a third wireless resource control message sent by the second network device; wherein the third wireless resource control message includes third indication information.

[0562] Alternatively, 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.

[0563] In this embodiment, the channel sounding reference signal configuration information 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. This allows the terminal device to determine the time domain resource for the SRS, or the cell to which the SRS belongs.

[0564] For example, for periodic SRS and semi-persistent SRS, the SRS configuration information indicates the time domain resource for transmitting the channel sounding reference signal. For example, the SRS configuration information configures periodicity and offset, thereby indicating the time domain resource for transmitting the SRS.

[0565] Alternatively, a third indication information (additional PCI index) may be added to the SRS configuration information, where the third indication information indicates the cell to which the SRS belongs, thus corresponding to the UL-only TRP scenario in a cell different from the macro station.

[0566] Alternatively, for the non-periodic SRS, the second network device sends first downlink control information (DCI format 0_1) to the terminal device, where the first downlink control information (DCI format 0_1) includes third indication information (additional PCI index / indicator).

[0567] Alternatively, for non-periodic SRS, the second network device sends first downlink control information (DCI format 0_1) to the terminal device, where the first downlink control information (DCI format 0_1) is used to indicate that the terminal device needs 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 (additionalPCI index / indicator).

[0568] Alternatively, for the non-periodic 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.

[0569] Alternatively, for the 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 and aperiodicSRS-ResourceTrigger / SRS-ResourceSet.

[0570] Therefore, the third indication information is indicated in a variety of ways, so that the terminal device can determine the cell to which the SRS belongs.

[0571] 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.

[0572] 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. The first network device then sends a response message to the second network device, which includes the TA. The second network device then sends the response message including the TA to the terminal device.

[0573] Then the terminal device obtains the TA.

[0574] In this embodiment, the terminal device sends an SRS to the first network device based on a spatial filter, wherein the spatial filter is a spatial filter corresponding to a 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, in the process of obtaining TA, the spatial filter used when 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 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, in the process of obtaining TA, the spatial filter used when sending the SRS in the random access process to the network device and the transmit power used when 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.

[0575] Figure 8 is a flow chart of a method for obtaining a timing advance provided by an embodiment of the present disclosure. As shown in Figure 8, an embodiment of the present disclosure provides a method for obtaining a timing advance, which can be applied to a network device in the aforementioned 5G system structure, where the network device is a first network device, to implement a 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, in 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 a 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, in 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. The method provided in this embodiment includes the following steps:

[0576] Step 801: A first network device receives a message 1 sent by a terminal device based on a spatial filter, wherein the message 1 includes a preamble code, and the preamble code is used to determine a timing advance; or, a channel sounding reference signal sent by a receiving terminal device based on a spatial filter, wherein the channel sounding reference signal is used to determine a timing advance; wherein the spatial filter is a spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter.

[0577] Step 802: The first network device sends a response message to the second network device; wherein the response message includes a timing advance, and the response message is used to feed back to the terminal device.

[0578] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a 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 best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0580] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0581] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0582] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0583] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0584] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0585] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0586] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0587] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0588] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0589] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0590] In this embodiment, the transmission power of sending message 1 is as described in the embodiment shown in FIG. 2 .

[0591] In some embodiments, the path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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; or, the path loss power of the uplink receiving point only is the sum of the downlink path loss power of the second network device and the path loss offset power of the first network device and the second network device.

[0592] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0593] The transmission power difference is a 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.

[0594] 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 transmission power of the physical uplink shared channel of the terminal device.

[0595] The details of the above method can be found in the description of the corresponding method embodiment in the above embodiment. Its implementation principle and technical effect are similar, and this embodiment will not be repeated here.

[0596] Figure 9 is a flow chart of a method for obtaining a timing advance provided by an embodiment of the present disclosure. As shown in Figure 9, an embodiment of the present disclosure provides a method for obtaining a timing advance, which can be applied to a network device in the aforementioned 5G system structure, where the network device is a second network device, to implement a 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, in 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 a 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, in 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. The method provided in this embodiment includes the following steps:

[0597] 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.

[0598] 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, and the message 1 includes a preamble code, and the preamble code 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.

[0599] 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.

[0600] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0601] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0602] In some embodiments, the method provided in this embodiment further includes:

[0603] Send first indication information to the terminal device; wherein the first indication information is used to indicate a channel detection reference signal associated with message 1.

[0604] In some embodiments, sending the first indication information to the terminal device includes:

[0605] Sending first downlink control information to the terminal device; wherein the first downlink control information includes first indication information; or, sending a first wireless resource control message to the terminal device; wherein the first wireless resource control message includes first indication information; or, sending a first media access control message to the terminal device; wherein the first media access control message includes first indication information.

[0606] In some embodiments, the method provided in this embodiment further includes:

[0607] Send a second indication message to the terminal device; wherein the second indication message is used to indicate the number of times message 1 is repeatedly sent.

[0608] In some embodiments, sending the second indication information to the terminal device includes:

[0609] Send a second wireless resource control message to the terminal device; wherein the second wireless resource control message includes second indication information; or send a second media access control message to the terminal device; wherein the second media access control message includes second indication information.

[0610] In some embodiments, the configuration information of the channel sounding reference signal indicates a time domain resource for sending the channel sounding reference signal.

[0611] Alternatively, the method provided in this embodiment further includes: sending 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.

[0612] In some embodiments, sending the third indication information to the terminal device includes:

[0613] Sending 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 detection reference signal, and the channel detection reference signal to be sent to the first network device includes the third indication information.

[0614] Alternatively, a third wireless resource control message is sent to the terminal device; wherein the third wireless resource control message includes third indication information.

[0615] Alternatively, a third media access control message is sent to the terminal device; wherein the third media access control message includes third indication information.

[0616] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0617] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0618] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0619] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0620] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0621] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0622] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0623] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0624] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0625] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0626] In this embodiment, the transmission power of sending message 1 is as described in the embodiment shown in FIG. 2 .

[0627] For example, the path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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; or, the path loss power of the uplink receiving point only is the sum of the downlink path loss power of the second network device and the path loss offset power of the first network device and the second network device.

[0628] In some embodiments, the method provided in this embodiment further includes:

[0629] 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0630] In some embodiments, sending the fifth indication information to the terminal device includes:

[0631] Send second downlink control information to the terminal device; wherein the second downlink control information includes fifth indication information.

[0632] Alternatively, a higher-layer signaling is sent to the terminal device; wherein the higher-layer signaling includes the fifth indication information.

[0633] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0634] The transmission power difference is a 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.

[0635] 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 transmission power of the physical uplink shared channel of the terminal device.

[0636] In some embodiments, the method provided in this embodiment further includes:

[0637] Send fourth indication information to the terminal device; wherein the fourth indication information is used to indicate the sending power difference.

[0638] In some embodiments, sending the fourth indication information to the terminal device includes:

[0639] Send first downlink control information to the terminal device, where the first downlink control information includes fourth indication information.

[0640] Alternatively, a fourth wireless resource control message is sent to the terminal device; wherein the fourth wireless resource control message includes fourth indication information.

[0641] Alternatively, a fourth media access control message is sent to the terminal device; wherein the fourth media access control message includes fourth indication information.

[0642] In some embodiments, the method provided in this embodiment further includes:

[0643] Sending sixth indication information to the terminal device; wherein the sixth indication information is used to indicate the spatial filter with the best 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.

[0644] The details of the above method can be found in the description of the corresponding method embodiment in the above embodiment. Its implementation principle and technical effect are similar, and this embodiment will not be repeated here.

[0645] FIG10 is a schematic diagram of a signaling interaction process of a method for obtaining a timing advance according to an embodiment of the present disclosure. As shown in FIG10 , this embodiment, based on the above embodiment, describes the signaling interaction process in detail. The method includes the following steps:

[0646] Step 1001: The second network device sends an RRC message to the terminal device, where the RRC message is used to indicate SRS configuration information.

[0647] For example, the second network device configures TCI-UL-State for the terminal device through an RRC message.

[0648] Step 1002: The second network device sends first downlink control information (ie, 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.

[0649] The PDCCH order information (DCI format 1_0) includes first indication information, which is SRS-Resource#1 (this is an SRS indication field, ie, SRS ID indicator). Thus, the first indication information indicates that the SRS associated with message 1 is SRS-Resource#1.

[0650] The spatial filter (ie, beam) of SRS-Resource#1 is the spatial filter of the configured TCI-UL-State-ID#1.

[0651] Step 1003: The terminal device sends a message 1 to the first network device on the time-frequency resources, where the message 1 includes a preamble.

[0652] The preamble index 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 SSB index in the PDCCH order information.

[0653] The spatial filter used in sending message 1 is the spatial filter of SRS-Resource#1, that is, the spatial filter of TCI-UL-State-ID#1.

[0654] For the transmission power of message 1, see the introduction of FIG2 .

[0655] Step 1004: After receiving the message 1 sent by the terminal device, the first network device estimates the TA based on the preamble code in the message 1.

[0656] Step 1005: The first network device sends a response message to the second network device, where the response message includes a TA.

[0657] The first network device may send a RAR MAC PDU message to the second network device, where the RAR MAC PDU message includes a TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0658] Step 1006: The second network device sends a response message to the terminal device, where the response message includes the TA.

[0659] The second network device may send a RAR MAC PDU message to the terminal device, where the RAR MAC PDU message includes the TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0660] Step 1007: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0661] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS between the terminal device and the first network device according to the received TA.

[0662] FIG11 is a schematic diagram of a signaling interaction process of a method for obtaining a timing advance according to an embodiment of the present disclosure. As shown in FIG11 , this embodiment, based on the above embodiment, describes the signaling interaction process in detail. The method includes the following steps:

[0663] Step 1101: The second network device sends an RRC message to the terminal device, where the RRC message is used to indicate SRS configuration information.

[0664] Step 1102: The second network device determines the SRS associated with message 1.

[0665] That is, the second network device establishes an association between message 1 and SRS. For example, PRACH occasion 1 is associated with SRS resource 1, PRACH occasion 2 is associated with SRS resource 2, and PRACH occasion 3 is associated with SRS resource 3.

[0666] Optionally, in step 1103 , the second network device sends first indication information to the terminal device, where the first indication information is used to indicate the SRS associated with message 1 .

[0667] For example, the first indication information is sent via an RRC message or a MAC CE message, or the first indication information has been predefined for the terminal device.

[0668] Step 1104: The second network device sends downlink control information (DCI format 1_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-Id#1 for subsequent uplink channel / signal transmission.

[0669] Step 1105: The second network device sends PDCCH order information (DCI format 1_0) to the terminal device. The PDCCH order information includes preamble index and SSB index. The PDCCH order information is used to trigger the terminal device to send message 1 to the first network device.

[0670] 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, wherein Message 1 includes a preamble.

[0671] The spatial filter of the SRS associated with message 1 is the beam indicated in TCI-UL-State-ID#1 indicated by the second network device.

[0672] For the transmission power of message 1, see the introduction of FIG2 .

[0673] Step 1107: After receiving the message 1 sent by the terminal device, the first network device estimates the TA based on the preamble code in the message 1.

[0674] Step 1108: The first network device sends a response message to the second network device, where the response message includes the TA.

[0675] The first network device may send a RAR MAC PDU message to the second network device, where the RAR MAC PDU message includes a TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0676] Step 1109: The second network device sends a response message to the terminal device, where the response message includes a TA.

[0677] The second network device may send a RAR MAC PDU message to the terminal device, where the RAR MAC PDU message includes the TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0678] Step 1110: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0679] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS between the terminal device and the first network device according to the received TA.

[0680] FIG12 is a schematic diagram of a signaling interaction process of a method for obtaining a timing advance according to an embodiment of the present disclosure. As shown in FIG12 , this embodiment, based on the above embodiment, describes the signaling interaction process in detail. The method includes the following steps:

[0681] 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 message 1 is repeatedly sent.

[0682] The second network device configures the terminal device to use a fixed spatial filter to send message 1 to the first network device. In addition, the second network device configures the terminal device to send message 1 repeatedly a number of times N.

[0683] Step 1202: The terminal device receives each SSB sent by the second network device and determines the SSB with the largest RSRP value.

[0684] 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.

[0685] Step 1203: The terminal device repeatedly sends message 1 to the first network device based on the spatial filter corresponding to the SSB with the largest RSRP value.

[0686] For the transmission power of message 1, see the introduction of FIG2 .

[0687] Step 1204: The first network device receives Message 1 based on different spatial filters and estimates the TA according to the preamble in Message 1.

[0688] Step 1205: The first network device sends a response message to the second network device, where the response message includes a TA.

[0689] The first network device may send a RAR MAC PDU message to the second network device, where the RAR MAC PDU message includes a TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0690] Step 1206: The second network device sends a response message to the terminal device, where the response message includes the TA.

[0691] The second network device may send a RAR MAC PDU message to the terminal device, where the RAR MAC PDU message includes the TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0692] Step 1207: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0693] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS between the terminal device and the first network device according to the received TA.

[0694] FIG13 is a schematic diagram of a signaling interaction process of a method for obtaining a timing advance according to an embodiment of the present disclosure. As shown in FIG13 , this embodiment, based on the above embodiment, describes the signaling interaction process in detail. The method includes the following steps:

[0695] Step 1301: The second network device sends indication information to the terminal device. The indication signaling is used to instruct the terminal device to send 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.

[0696] Step 1302: The terminal device sends a message 1 to the first network device based on a spatial filter in a set of spatial filters. The message 1 includes a preamble.

[0697] For example, the terminal device sends message 1 to the first network device in each of the different time slots based on each different spatial filter. For example, the terminal device sends message 1 to the first network device in time slot 1 based on spatial filter 1; the terminal device sends message 1 to the first network device in time slot 2 based on spatial filter 2; and the terminal device sends message 1 to the first network device in time slot 3 based on spatial filter 3.

[0698] For the transmission power of message 1, see the introduction of FIG2 .

[0699] Step 1303: The first network device receives Message 1 sent by the terminal device based on a fixed spatial filter. Furthermore, the first network device determines the spatial filter with the best performance and estimates the TA based on the preamble in Message 1.

[0700] Step 1304a: The first network device sends a response message to the second network device, where the response message includes a TA.

[0701] The first network device may send a RAR MAC PDU message to the second network device, where the RAR MAC PDU message includes a TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0702] Step 1304b: The first network device sends sixth indication information to the second network device; wherein the sixth indication information is used to indicate the spatial filter with the best performance.

[0703] For example, the first network device sends a RAR MAC PDU message to the second network device, where the RAR MAC PDU message includes sixth indication information.

[0704] Step 1305a: The second network device sends a response message to the terminal device, where the response message includes a TA.

[0705] The second network device may send a RAR MAC PDU message to the terminal device, where the RAR MAC PDU message includes the TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0706] Step 11305b: The second network device sends sixth indication information to the terminal device; wherein the sixth indication information is used to indicate the spatial filter with the best performance.

[0707] For example, the second network device may send a RAR MAC PDU message to the terminal device, where the RAR MAC PDU message includes sixth indication information.

[0708] Step 1306: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0709] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS between the terminal device and the first network device according to the received TA.

[0710] Step 1307: The terminal device sends message 3 to the first network device based on the spatial filter indicated by the sixth indication information and the obtained TA.

[0711] FIG14 is a schematic diagram of a signaling interaction process of a method for obtaining a timing advance according to an embodiment of the present disclosure. As shown in FIG14 , this embodiment, based on the above embodiment, describes the signaling interaction process in detail. The method includes the following steps:

[0712] Step 1401: The second network device configures an aperiodic SRS for the terminal device through an RRC message.

[0713] For example, two SRS sets are configured, namely SRS resource set 1 and SRS resource set 2. SRS resource set 2 includes 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.

[0714] Step 1402: In time slot k, the second network device sends downlink control information (DCI format 1_1 / 1_2) to the terminal device. The downlink control information is used to instruct the terminal device to use the spatial filter indicated in TCI-UL-State in uplink transmission after this time to send SRS.

[0715] 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.

[0716] At this time, assuming the UL-only-TRP scenario, SSB can also be sent to the terminal device.

[0717] Step 1403: In time slot k, the second network device sends first downlink control information (DCI format 0_1) to the terminal device.

[0718] 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 an SRS to the first network device.

[0719] Alternatively, for the aperiodic SRS, the first downlink control information (DCI format 0_1) includes third indication information (additional PCI index).

[0720] Step 1404: The second network device sends fourth indication information to the terminal device; wherein the fourth indication information is used to indicate the transmission power difference.

[0721] The transmit power difference is a delta_power_offset value, which represents the difference between the power of the SRS resource set 1 sent by the terminal device to the second network device and the power of the SRS resource set 2 sent by the terminal device to the first network device.

[0722] The fourth indication information may be independent signaling, or carried through an RRC message, or carried through a MAC CE message.

[0723] Step 1405: The terminal device determines the transmit power of the SRS according to the transmit power difference.

[0724] For the method of calculating the transmission power of the SRS, refer to the above embodiment.

[0725] Step 1406: The terminal device sends an SRS to the first network device according to the spatial filter indicated by the second network device.

[0726] 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 to send the SRS in the uplink transmission after this time. Thus, the terminal device sends the SRS to the first network device according to the spatial filter indicated in the TCI-UL-State.

[0727] Step 1407: The first network device estimates the TA according to the SRS.

[0728] Step 1408: The first network device sends a response message to the second network device, where the response message includes the TA.

[0729] The first network device may send a RAR MAC PDU message to the second network device, where the RAR MAC PDU message includes a TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0730] Step 1409: The second network device sends a response message to the terminal device, where the response message includes a TA.

[0731] The second network device may send a RAR MAC PDU message to the terminal device, where the RAR MAC PDU message includes the TA. For example, the RAR MAC PDU message carries a TAG ID, where the TAG ID indicates the TA.

[0732] Step 1410: The terminal device adjusts the uplink transmission with the first network device according to the received TA.

[0733] For example, the terminal device adjusts the uplink transmission PUSCH / PUCCH / SRS between the terminal device and the first network device according to the received TA.

[0734] FIG15 is a schematic diagram of the structure of a timing advance acquisition device provided by an embodiment of the present disclosure. As shown in FIG15 , an embodiment of the present disclosure provides a timing advance acquisition device, which can be applied to a terminal device in the aforementioned 5G system structure to implement, for UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in the process of acquiring 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 the message in the random access process to the network device, and the terminal device can acquire the TA; and can also implement, for UL-only TRP scenarios (S-DCI based multi-TRP transmission), when there is no downlink communication link between the network device and the terminal device, in the process of acquiring TA, determining the spatial filter used when sending a message in the random access process to the network device, and determining the transmit power used when 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 acquire the TA. The device includes: a memory 1510, a transceiver 1520, and a processor 1530. The transceiver 1520 is configured to receive and send data under the control of the processor 1530 .

[0735] In FIG15 , the bus architecture may include any number of interconnected buses and bridges, linking together various circuits of one or more processors 1530 represented by processor 1530 and memory 1510 represented by memory 1510. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 1520 may be a plurality of components, including a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, and the like. For different user devices, the user interface 1540 may also be an interface capable of connecting to required external or internal devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0736] The processor 1530 is responsible for managing the bus architecture and general processing, and the memory 1510 can store data used by the processor 1530600 when performing operations.

[0737] 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), and the processor 1530 may also adopt a multi-core architecture.

[0738] The processor 1530 is configured to execute any method provided by the embodiments of the present disclosure 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.

[0739] In this embodiment, the memory 1510 is used to store computer programs. The transceiver 1520 is used to send 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:

[0740] Sending message 1 to the first network device based on the spatial filter, where the message 1 includes a preamble, the preamble is used to determine the 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, sending 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;

[0741] A response message sent by the second network device is received; wherein the response message includes a timing advance, and the response message is sent by the first network device to the second network device.

[0742] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0743] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0744] In some embodiments, the processor 1530 is further configured to: receive first indication information sent by the second network device; wherein the first indication information is used to indicate a channel sounding reference signal associated with the message 1.

[0745] In some embodiments, when receiving the first indication information sent by the second network device, the processor 1530 is configured to:

[0746] Receive first downlink control information sent by the second network device; wherein the first downlink control information includes first indication information.

[0747] Alternatively, a first radio resource control message sent by the second network device is received; wherein the first radio resource control message includes first indication information.

[0748] Alternatively, a first media access control message sent by the second network device is received; wherein the first media access control message includes the first indication information.

[0749] In some embodiments, the processor 1530 is further used to: receive second indication information sent by the second network device; wherein the second indication information is used to indicate the number of repeated transmissions of message 1.

[0750] In some embodiments, when receiving the second indication information sent by the second network device, the processor 1530 is configured to:

[0751] A second radio resource control message sent by a second network device is received; wherein the second radio resource control message includes second indication information.

[0752] Alternatively, a second media access control message sent by a second network device is received; wherein the second media access control message includes second indication information.

[0753] In some embodiments, the configuration information of the channel sounding reference signal indicates a time domain resource for sending the channel sounding reference signal.

[0754] Alternatively, in some embodiments, 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 a cell to which the channel sounding reference signal belongs.

[0755] In some embodiments, when receiving the third indication information sent by the second network device, the processor 1530 is configured to:

[0756] Receive first downlink control information sent by the 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 the third indication information.

[0757] Alternatively, a third radio resource control message sent by the second network device is received; wherein the third radio resource control message includes third indication information.

[0758] Alternatively, a third media access control message sent by the second network device is received; wherein the third media access control message includes third indication information.

[0759] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0760] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0761] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0762] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0763] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0764] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0765] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0766] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0767] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0768] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0769] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0770] In some embodiments, the processor 1530 is further used to: receive 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0771] In some embodiments, when receiving the fifth indication information sent by the second network device, the processor 1530 is configured to:

[0772] Receive second downlink control information sent by the second network device; wherein the second downlink control information includes fifth indication information.

[0773] Alternatively, a higher layer signaling sent by the second network device is received; wherein the higher layer signaling includes the fifth indication information.

[0774] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0775] The transmission power difference is a 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.

[0776] 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 transmission power of the physical uplink shared channel of the terminal device.

[0777] In some embodiments, the processor 1530 is further configured to: receive fourth indication information sent by the second network device; wherein the fourth indication information is used to indicate a transmission power difference.

[0778] In some embodiments, when receiving the fourth indication information sent by the second network device, the processor 1530 is configured to:

[0779] First downlink control information sent by the second network device is received, where the first downlink control information includes fourth indication information.

[0780] Alternatively, a fourth radio resource control message sent by the second network device is received; wherein the fourth radio resource control message includes fourth indication information.

[0781] Alternatively, a fourth media access control message sent by the second network device is received; wherein the fourth media access control message includes fourth indication information.

[0782] In some embodiments, the processor 1530 is further configured to:

[0783] Receive sixth indication information sent by the second network device; wherein the sixth indication information is used to indicate the spatial filter with the best performance; and send message 3 to the first network device based on the spatial filter indicated by the sixth indication information.

[0784] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be repeated here.

[0785] Figure 16 is a structural schematic diagram of a timing advance acquisition device provided by an embodiment of the present disclosure. As shown in Figure 16, an embodiment of the present disclosure provides a timing advance acquisition device, which can be applied to a network device in the aforementioned 5G system structure, where the network device is a first network device, to implement a 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, in the process of acquiring 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 the TA; it can also be implemented for a 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, in the process of acquiring 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 the TA. The apparatus includes: a memory 1610 , a transceiver 1620 , and a processor 1630 . The transceiver 1620 is configured to receive and send data under the control of the processor 1630 .

[0786] In FIG16 , the bus architecture may include any number of interconnected buses and bridges, linking together various circuits of one or more processors 1630 represented by processor 1630 and memory 1610 represented by memory 1610. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, all of which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. The transceiver 1620 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, or the like. The processor 1630 is responsible for managing the bus architecture and general processing, and the memory 1610 may store data used by the processor 1630x10 when performing operations.

[0787] 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.

[0788] The processor 1630 is configured to execute any method provided by the embodiments of the present disclosure 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 arranged physically separately.

[0789] In this embodiment, the memory 1610 is used to store computer programs. The transceiver 1620 is used to send 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:

[0790] Receiving message 1 sent by a terminal device based on a spatial filter, wherein message 1 includes a preamble, the preamble is used to determine 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 receiving a channel sounding reference signal sent by a terminal device based on a spatial filter, wherein 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;

[0791] A response message is sent to the second network device; wherein the response message includes a timing advance, and the response message is used to feed back to the terminal device.

[0792] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0793] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0794] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0795] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0796] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0797] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0798] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0799] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0800] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0801] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0802] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0803] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0804] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0805] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0806] The transmission power difference is a 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.

[0807] 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 transmission power of the physical uplink shared channel of the terminal device.

[0808] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be repeated here.

[0809] Figure 17 is a structural schematic diagram of a timing advance acquisition device provided by an embodiment of the present disclosure. As shown in Figure 17, an embodiment of the present disclosure provides a timing advance acquisition device, which can be applied to a network device in the aforementioned 5G system structure, where the network device is a second network device, so as to implement, for a 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, in the process of acquiring TA, determining the spatial filter used when sending a message in a random access process to the network device, so that the terminal device can send a message in a random access process to the network device, and the terminal device can obtain the TA; it can also be implemented for a 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, in the process of acquiring TA, determining the spatial filter used when sending a message in a random access process to the network device, and determining the transmission power used when sending a message in a random access process to the network device; so that the terminal device can send a message in a random access process to the network device, and the terminal device can obtain the TA. The apparatus includes: a memory 1710 , a transceiver 1720 , and a processor 1730 . The transceiver 1720 is configured to receive and send data under the control of the processor 1730 .

[0810] In FIG. 17 , the bus architecture may include any number of interconnected buses and bridges, linking together various circuits of one or more processors 1730 represented by processor 1730 and memory 1710 represented by memory 1710. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, all of which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface. The transceiver 1720 may be a plurality of components, including a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, or the like. The processor 1730 is responsible for managing the bus architecture and general processing, while the memory 1710 may store data used by the processor 1730x10 when performing operations.

[0811] 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.

[0812] The processor 1730 is configured to execute any method provided by the embodiments of the present disclosure 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.

[0813] In this embodiment, the memory 1710 is used to store computer programs. The transceiver 1720 is used to send 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:

[0814] Send first indication information to the terminal device; wherein the first indication information is used to indicate a channel detection reference signal associated with message 1.

[0815] 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, where the message 1 includes a preamble code, the preamble code 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, where the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter.

[0816] Receive a response message sent by the first network device, and send the response message to the terminal device; wherein the response message includes a timing advance.

[0817] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0818] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0819] In some embodiments, the processor 1730 is further configured to:

[0820] Send first indication information to the terminal device; wherein the first indication information is used to indicate a channel detection reference signal associated with message 1.

[0821] In some embodiments, sending the first indication information to the terminal device includes:

[0822] Sending first downlink control information to the terminal device; wherein the first downlink control information includes first indication information;

[0823] Alternatively, sending a first radio resource control message to the terminal device; wherein the first radio resource control message includes first indication information;

[0824] Alternatively, a first media access control message is sent to the terminal device; wherein the first media access control message includes first indication information.

[0825] In some embodiments, the processor 1730 is further used to: send second indication information to the terminal device; wherein the second indication information is used to indicate the number of times message 1 is repeatedly sent.

[0826] In some embodiments, when sending the second indication information to the terminal device, the processor 1730 is configured to:

[0827] A second wireless resource control message is sent to the terminal device; wherein the second wireless resource control message includes second indication information.

[0828] Alternatively, a second media access control message is sent to the terminal device; wherein the second media access control message includes second indication information.

[0829] In some embodiments, the configuration information of the channel sounding reference signal indicates a time domain resource for sending the channel sounding reference signal.

[0830] Alternatively, the processor 1730 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.

[0831] In some embodiments, when the processor 1730 sends the third indication information to the terminal device, it is configured to:

[0832] Sending 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 detection reference signal, and the channel detection reference signal to be sent to the first network device includes the third indication information.

[0833] Alternatively, a third wireless resource control message is sent to the terminal device; wherein the third wireless resource control message includes third indication information.

[0834] Alternatively, a third media access control message is sent to the terminal device; wherein the third media access control message includes third indication information.

[0835] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0836] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0837] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0838] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0839] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0840] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0841] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0842] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0843] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0844] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0845] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0846] In some embodiments, the processor 1730 is further configured to:

[0847] 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0848] In some embodiments, when the processor 1730 sends the fifth indication information to the terminal device, it is configured to:

[0849] Send second downlink control information to the terminal device; wherein the second downlink control information includes fifth indication information.

[0850] Alternatively, a higher-layer signaling is sent to the terminal device; wherein the higher-layer signaling includes the fifth indication information.

[0851] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0852] The transmission power difference is a 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.

[0853] 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 transmission power of the physical uplink shared channel of the terminal device.

[0854] In some embodiments, the processor 1730 is further used to: send fourth indication information to the terminal device; wherein the fourth indication information is used to indicate the transmission power difference.

[0855] In some embodiments, when the processor 1730 sends the fourth indication information to the terminal device, it is configured to:

[0856] Send first downlink control information to the terminal device, where the first downlink control information includes fourth indication information.

[0857] Alternatively, a fourth wireless resource control message is sent to the terminal device; wherein the fourth wireless resource control message includes fourth indication information.

[0858] Alternatively, a fourth media access control message is sent to the terminal device; wherein the fourth media access control message includes fourth indication information.

[0859] In some embodiments, the processor 1730 is further configured to:

[0860] Sending sixth indication information to the terminal device; wherein the sixth indication information is used to indicate the spatial filter with the best 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.

[0861] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be repeated here.

[0862] FIG18 is a schematic diagram of the structure of a timing advance acquisition device provided by an embodiment of the present disclosure. As shown in FIG18 , an embodiment of the present disclosure provides a timing advance acquisition device, which can be applied to a terminal device in the aforementioned 5G system structure. The device 1800 includes:

[0863] The first sending module 1801 is used to send message 1 to the first network device based on the spatial filter, wherein the message 1 includes a preamble code, the preamble code 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, based on the 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, and the spatial filter is the spatial filter corresponding to the channel sounding reference signal, or the spatial filter is a specified spatial filter.

[0864] The first receiving module 1802 is 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.

[0865] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0866] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0867] In some embodiments, the apparatus provided by this embodiment further includes: 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.

[0868] In some embodiments, when receiving the first indication information sent by the second network device, the second receiving module is configured to:

[0869] Receive first downlink control information sent by the second network device; wherein the first downlink control information includes first indication information.

[0870] Alternatively, a first radio resource control message sent by the second network device is received; wherein the first radio resource control message includes first indication information.

[0871] Alternatively, a first media access control message sent by the second network device is received; wherein the first media access control message includes the first indication information.

[0872] In some embodiments, the apparatus provided by this embodiment further includes: a third receiving module, configured to receive second indication information sent by a second network device; wherein the second indication information is used to indicate the number of times message 1 is repeatedly sent.

[0873] In some embodiments, when receiving the second indication information sent by the second network device, the third receiving module is configured to:

[0874] A second radio resource control message sent by a second network device is received; wherein the second radio resource control message includes second indication information.

[0875] Alternatively, a second media access control message sent by a second network device is received; wherein the second media access control message includes second indication information.

[0876] In some embodiments, the configuration information of the channel sounding reference signal indicates a time domain resource for sending the channel sounding reference signal.

[0877] Alternatively, the apparatus provided by 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.

[0878] In some embodiments, when receiving the third indication information sent by the second network device, the fourth receiving module is configured to:

[0879] Receive first downlink control information sent by the 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 the third indication information.

[0880] Alternatively, a third radio resource control message sent by the second network device is received; wherein the third radio resource control message includes third indication information.

[0881] Alternatively, a third media access control message sent by the second network device is received; wherein the third media access control message includes third indication information.

[0882] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0883] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0884] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0885] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0886] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0887] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0888] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0889] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0890] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0891] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0892] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0893] In some embodiments, the present embodiment provides an apparatus further comprising:

[0894] The fifth receiving module is used to receive 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0895] In some embodiments, when receiving the fifth indication information sent by the second network device, the fifth receiving module is configured to:

[0896] Receive second downlink control information sent by the second network device; wherein the second downlink control information includes fifth indication information.

[0897] Alternatively, a higher layer signaling sent by the second network device is received; wherein the higher layer signaling includes the fifth indication information.

[0898] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0899] The transmission power difference is a 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.

[0900] 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 transmission power of the physical uplink shared channel of the terminal device.

[0901] In some embodiments, the present embodiment provides an apparatus further comprising:

[0902] The sixth receiving module is used to receive fourth indication information sent by the second network device; wherein the fourth indication information is used to indicate the transmission power difference.

[0903] In some embodiments, when receiving the fourth indication information sent by the second network device, the sixth receiving module is configured to:

[0904] First downlink control information sent by the second network device is received, where the first downlink control information includes fourth indication information.

[0905] Alternatively, a fourth radio resource control message sent by the second network device is received; wherein the fourth radio resource control message includes fourth indication information.

[0906] Alternatively, a fourth media access control message sent by the second network device is received; wherein the fourth media access control message includes fourth indication information.

[0907] In some embodiments, the present embodiment provides an apparatus further comprising:

[0908] The seventh receiving module is configured to receive sixth indication information sent by the second network device; wherein the sixth indication information is used to indicate a spatial filter with optimal performance.

[0909] The second sending module is configured to send message 3 to the first network device based on the spatial filter indicated by the sixth indication information.

[0910] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be repeated here.

[0911] FIG19 is a schematic diagram of the structure of a timing advance acquisition device provided by an embodiment of the present disclosure. As shown in FIG19 , an embodiment of the present disclosure provides a timing advance acquisition device, which can be applied to a network device in the aforementioned 5G system structure, where the network device is a first network device. The device 1900 includes:

[0912] Receiving module 1901 is used to receive message 1 sent by a terminal device based on a spatial filter, wherein message 1 includes a preamble code, the preamble code 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, to receive a channel sounding reference signal sent by the terminal device based on the spatial filter, 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.

[0913] The sending module 1902 is used to 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.

[0914] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0915] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0916] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0917] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0918] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0919] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0920] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0921] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0922] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0923] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0924] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0925] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0926] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0927] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0928] The transmission power difference is a 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.

[0929] 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 transmission power of the physical uplink shared channel of the terminal device.

[0930] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be repeated here.

[0931] FIG20 is a schematic diagram of the structure of a timing advance acquisition device provided by an embodiment of the present disclosure. As shown in FIG20 , an embodiment of the present disclosure provides a timing advance acquisition device, which can be applied to a network device in the aforementioned 5G system structure, where the network device is a second network device. The device 2000 includes:

[0932] The first sending module 2001 is used 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.

[0933] 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, where the message 1 includes a preamble code, the preamble code 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, where the channel sounding reference signal is used to determine the timing advance, or the spatial filter is a specified spatial filter.

[0934] The first receiving module 2002 is configured to receive a response message sent by the first network device, and send the response message to the terminal device; wherein the response message includes a timing advance.

[0935] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is a spatial filter corresponding to a channel sounding reference signal associated with message 1 .

[0936] When the spatial filter is a specified spatial filter, the spatial filter is the spatial filter corresponding to the synchronization signal block with the best reference signal receiving power when receiving the synchronization signal block, or the spatial filter is any spatial filter in a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

[0937] In some embodiments, the apparatus provided by the present disclosure further includes:

[0938] The second sending module is used to send first indication information to the terminal device; wherein the first indication information is used to indicate the channel detection reference signal associated with message 1.

[0939] In some embodiments, when the second sending module sends the first indication information to the terminal device, it is configured to:

[0940] Send first downlink control information to the terminal device; wherein the first downlink control information includes first indication information.

[0941] Alternatively, a first wireless resource control message is sent to the terminal device; wherein the first wireless resource control message includes first indication information.

[0942] Alternatively, a first media access control message is sent to the terminal device; wherein the first media access control message includes first indication information.

[0943] In some embodiments, the apparatus provided by the present disclosure further includes:

[0944] The third sending module is used to send second indication information to the terminal device; wherein the second indication information is used to indicate the number of times message 1 is repeatedly sent.

[0945] In some embodiments, when the third sending module sends the second indication information to the terminal device, it is configured to:

[0946] A second wireless resource control message is sent to the terminal device; wherein the second wireless resource control message includes second indication information.

[0947] Alternatively, a second media access control message is sent to the terminal device; wherein the second media access control message includes second indication information.

[0948] In some embodiments, the configuration information of the channel sounding reference signal indicates a time domain resource for sending the channel sounding reference signal.

[0949] Alternatively, the apparatus provided by the present disclosure further includes: a third sending module, 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.

[0950] In some embodiments, when the third sending module sends the third indication information to the terminal device, it is configured to:

[0951] Sending 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 detection reference signal, and the channel detection reference signal to be sent to the first network device includes the third indication information.

[0952] Alternatively, a third wireless resource control message is sent to the terminal device; wherein the third wireless resource control message includes third indication information.

[0953] Alternatively, a third media access control message is sent to the terminal device; wherein the third media access control message includes third indication information.

[0954] In some embodiments, when the spatial filter is a spatial filter corresponding to a channel sounding reference signal, the spatial filter is any one of the following:

[0955] The spatial filter is a spatial filter used to send a channel sounding reference signal included in the uplink transmission indication state information.

[0956] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block included in the uplink transmission indication status information.

[0957] Alternatively, the spatial filter is a spatial filter for receiving the synchronization signal block contained in the joint transmission indication status information.

[0958] Alternatively, the spatial filter is a spatial filter indicated by the transmission indication status information of the channel sounding reference signal.

[0959] Alternatively, the spatial filter is the spatial filter indicated by the uplink transmission indication state 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.

[0960] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information corresponding to the channel sounding reference signal with the smallest identifier in the channel sounding reference signal set.

[0961] Alternatively, the spatial filter is the spatial filter indicated by the transmission indication state information with the smallest identifier in the state information pool, wherein the state information pool is a joint transmission indication state information pool, or the state information pool is an uplink transmission indication state information pool.

[0962] Alternatively, the spatial filter is the spatial filter indicated by the unified transmission indication status information most recently sent by the second network device, or the spatial filter is the spatial filter indicated by the uplink transmission indication status information most recently sent by the second network device.

[0963] In some embodiments, 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 receiving power of message 1 and the path loss power of the uplink receiving point only.

[0964] The path loss power of the uplink receiving point only is the difference between the receiving power configured for the channel sounding reference signal and the transmitting power configured for the channel sounding reference signal; or, the path loss power of the uplink receiving point only 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.

[0965] In some embodiments, the apparatus provided by the present disclosure further includes:

[0966] The fifth sending module is used to 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 receiving point only, or the fifth indication information is used to indicate the uplink received signal power difference.

[0967] In some embodiments, when the fifth sending module sends the fifth indication information to the terminal device, it is configured to:

[0968] Send second downlink control information to the terminal device; wherein the second downlink control information includes fifth indication information.

[0969] Alternatively, a higher-layer signaling is sent to the terminal device; wherein the higher-layer signaling includes the fifth indication information.

[0970] In some embodiments, the transmission power of the channel detection 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 the sum of the power value and the transmission power difference.

[0971] The transmission power difference is a 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.

[0972] 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 transmission power of the physical uplink shared channel of the terminal device.

[0973] In some embodiments, the apparatus provided by the present disclosure further includes:

[0974] The sixth sending module is used to send fourth indication information to the terminal device; wherein the fourth indication information is used to indicate the sending power difference.

[0975] In some embodiments, when the sixth sending module sends the fourth indication information to the terminal device, it is configured to:

[0976] Send first downlink control information to the terminal device, where the first downlink control information includes fourth indication information.

[0977] Alternatively, a fourth wireless resource control message is sent to the terminal device; wherein the fourth wireless resource control message includes fourth indication information.

[0978] Alternatively, a fourth media access control message is sent to the terminal device; wherein the fourth media access control message includes fourth indication information.

[0979] In some embodiments, the apparatus provided by the present disclosure further includes:

[0980] The seventh sending module is used to send sixth indication information to the terminal device; wherein the sixth indication information is used to indicate the spatial filter with the best 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.

[0981] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be repeated here.

[0982] It should be noted that the division of units in the embodiments of the present disclosure is schematic and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0983] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present disclosure, or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the various embodiments of the present disclosure.

[0984] An embodiment of the present disclosure provides a processor-readable storage medium, which stores a computer program. The computer program is used to enable a processor to execute the method for obtaining the timing advance provided in any one of the above embodiments.

[0985] The processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO)), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROMs, EPROMs, EEPROMs, non-volatile memories (NAND FLASH), solid-state drives (SSDs)), etc.

[0986] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0987] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0988] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0989] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A method for obtaining timing advance, wherein, 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 a 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 a 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 a 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 any one of a preset spatial filter combination, and the preset spatial filter combination includes multiple spatial filters.

3. The method according to claim 2, wherein The method further includes: receiving 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 Message 1.

4. The method according to claim 2, wherein The method further includes: receiving second indication information sent by a second network device; where the second indication information is used to indicate the number of repeated transmissions of Message 1.

5. The method according to claim 1, wherein, The method further includes: Determining configuration information of the channel sounding reference signal, where the configuration information is used to indicate the time-domain resource for sending the channel sounding reference signal; Or, receiving 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.

6. The method according to any one of claims 1-5, wherein, 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; 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.

7. The method according to any one of claims 1-5, wherein 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.

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, wherein 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.

10. The method according to claim 9, wherein 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.

11. A method for obtaining timing advance, wherein, 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, wherein, 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 any one of the preset spatial filter combinations, 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 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.

14. The method according to any one of claims 11 - 13, wherein 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, wherein, 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 receive power of Message 1 and the path loss power of the uplink-only receive point.

16. The method according to claim 15, 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; 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 timing advance, wherein, 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 preamble is included in the Message 1, 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 timing advance is included in the response message.

18. The method according to claim 17, wherein, 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 any one of the spatial filters 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, wherein The method further includes: sending second indication information to the terminal device; wherein, the second indication information is used to indicate the number of retransmissions of Message 1.

21. The method according to claim 17, wherein 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, 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 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 multiple 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, wherein, 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; wherein, the fourth indication information is used to indicate the transmission power difference.

25. The method according to any one of claims 17 - 21, wherein 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, wherein, 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 a timing advance, wherein, The apparatus includes: a memory, a transceiver, 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: Based on a spatial filter, send Message 1 to a first network device, where Message 1 includes a preamble for determining a 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, 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, and the spatial filter is the spatial filter corresponding to the 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 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 any one of the spatial filters 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, wherein 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 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.

30. An apparatus for obtaining timing advance, wherein, The device 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 for determining a 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, 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, and the spatial filter is the spatial filter corresponding to the 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 apparatus according to claim 30, wherein, 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 any one of the preset spatial filter combinations, and the preset spatial filter combination includes multiple spatial filters.

32. The device according to claim 30 or 31, wherein The transmission power of the transmission 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 sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

33. An apparatus for obtaining a timing advance, wherein, 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 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.

34. The apparatus according to claim 33, wherein, 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 any one of the preset spatial filter combinations, and the preset spatial filter combination includes multiple spatial filters.

35. The device according to claim 33 or 34, wherein, The transmission power of the transmission 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 sent by the first network device and the transmission power of the channel sounding reference signal sent by the second network device.

36. An apparatus for obtaining timing advance, wherein, The device includes: A first sending 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 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; A first receiving 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, wherein, The apparatus includes: A receiving 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 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; A sending module, configured to send a response message to a 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, wherein, The apparatus includes: A first sending module, configured to send first indication information to a 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 a 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 a timing advance, or the spatial filter is a specified spatial filter; A first receiving module, configured to receive a response message sent by a 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, wherein, The non-transitory readable storage medium stores a computer program, which is used to cause a processor to execute the method according to any one of claims 1-10, or the computer program is used to cause a processor to execute the method according to any one of claims 11-16, or the computer program is used to cause a processor to execute the method according to any one of claims 17-26.

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