TA Determination Method and Device for Terminal Device

Abstract

The present application provides a TA determination method and apparatus for a terminal device. After the terminal device receives TA adjustment parameters sent by an access network device and determines that its TA needs to be adjusted, a TA scaling factor, a subcarrier spacing parameter, and a first TA are determined to jointly adjust the first TA to obtain a second TA. Due to the addition of the TA adjustment parameter k when the terminal device determines the second TA, the adjustable range of the TA is larger. Therefore, it can be applied to determine the TA of the terminal device when the terminal device communicates with a satellite base station, so that the terminal device can adjust the TA in the case of device movement jointly caused by the terminal device itself and the satellite base station.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a method, device and system for determining a timing advance (TA) of a terminal device. Background Art

[0002] When a terminal device communicates with an access network device (e.g., a base station), if the terminal device is far away from the access network device, there will be a large transmission delay in the uplink communication data sent by the terminal device to the access network device. Therefore, the access network device will set a timing advance (TA) for the terminal device, so that the terminal device can obtain a negative offset between the first time of receiving the downlink communication data of the access network device and the second time of sending the uplink communication data to the access network device through the TA. This enables the terminal device to send the uplink communication data to the access network device in advance according to the TA to reduce the transmission delay of the uplink communication data.

[0003] When the terminal device is in the process of random access, the access network device determines the TA of the terminal device according to the random access preamble code sent by the terminal device, and sends the TA initial parameters to the terminal device through the TAC field, so that the terminal device can determine the TA according to the TA initial parameters. After the terminal device is randomly accessed, according to the mobility of the terminal device, the access network device determines to adjust the TA of the terminal device by measuring the uplink communication data of the terminal device, and also sends the TA adjustment parameters to the terminal device through the TAC field, so that the terminal device can adjust the TA according to the TA adjustment parameters. In addition, in communication systems such as the fifth generation mobile network new radio access technology (5G NR), the adjustment range of the access network device each time it adjusts the TA of the terminal device, as well as the total range that can be adjusted within a period of time, are restricted.

[0004] However, the existing TA determination method only considers the mobility of the terminal device. When the access network device is a satellite base station, the satellite base station itself also has mobility, resulting in that the existing TA determination method of the terminal device cannot be directly applied to the satellite base station. Therefore, how to enable the TA determination method of the terminal device to be applied to the satellite base station is a technical problem to be solved in this field. Summary of the invention

[0005] The present application provides a TA determination method, device and system for a terminal device, so as to solve the problem that the TA determination method for a terminal device in the prior art cannot be applied to a satellite base station.

[0006] The first aspect of this application provides a method for determining the TA of a terminal device, including:

[0007] Obtain TA adjustment parameters from an access network device; wherein, the TA adjustment parameters are used to indicate the TA adjustment amount of the terminal device;

[0008] Determine the TA scaling factor of the terminal device, the subcarrier spacing parameter of the terminal device, and the first TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameters; wherein, the TA scaling factor is used to scale the TA adjustment amount of the terminal device;

[0009] Determine the second TA according to the TA adjustment parameters, the TA scaling factor, the subcarrier spacing parameter, and the first TA.

[0010] In summary, in the method for determining the TA of the terminal device provided in this embodiment, when the terminal device receives the TA adjustment parameters sent by the access network device and determines that its TA needs to be adjusted, the TA scaling factor, the subcarrier spacing parameter, and the first TA are determined to jointly adjust the first TA to obtain the second TA. Since in this embodiment, when the terminal device determines the second TA, due to the addition of the TA adjustment parameter k, the range that the terminal device can adjust when adjusting the TA is larger. Therefore, it can be applied to, for example, a satellite communication system to enable the terminal device to adjust the TA in the case where the device movement is caused by both the terminal device itself and the satellite base station. And, the method for determining the TA of the terminal device described in this embodiment can also be applied in an existing terrestrial communication system, and the terminal device can adjust the TA only considering the mobility of the terminal device itself. Therefore, the method for determining the TA of the terminal device provided in this embodiment can also be applied to both terrestrial fixed base stations and satellite base stations at the same time, and has portability.

[0011] In an embodiment of the first aspect of this application, the determining the second TA according to the TA adjustment parameters, the TA scaling factor, the subcarrier spacing parameter, and the first TA includes:

[0012] Calculate TA2 through the formula TA2 = TA1 + k·(T A -31)·16·64 / 2 μ ;

[0013] wherein, TA1 is the first TA, T A is the TA adjustment parameter, k is the TA scaling factor, 2 μ is the subcarrier spacing parameter, Δf = 2 μ ·15 [kHz], and △f is the subcarrier spacing of the terminal device.

[0014] In summary, in the TA determination method of the terminal device provided in this embodiment, the second TA is calculated through a formula, which is an extension based on the existing TA determination method, making the TA determination method in this embodiment portable and capable of being compatible with existing communication systems.

[0015] In an embodiment of the first aspect of the present application, determining the TA scaling factor includes:

[0016] Determining the TA scaling factor according to the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA.

[0017] In an embodiment of the first aspect of the present application, the determining the TA scaling factor according to the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA includes:

[0018] Calculating the TA scaling factor k through the formula 2(v1 + v2) / f TA / c = k·32·16·64·T c / 8;

[0019] where v1 is the maximum moving speed of the terminal device, v2 is the moving speed of the access network device, f TA is the frequency at which the access network device instructs the terminal device to adjust the TA, c is the speed of light, and T c is the basic time unit.

[0020] In an embodiment of the first aspect of the present application, it further includes: determining whether the TA adjustment amount of the terminal device after being processed by the TA scaling factor meets a preset condition;

[0021] If so, determining the second TA according to the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA.

[0022] In an embodiment of the first aspect of the present application, it includes: determining the TA scaling factor according to the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device.

[0023] In an embodiment of the first aspect of the present application, the determining the TA scaling factor according to the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device includes:

[0024] By looking up the first mapping relationship, determine the TA scaling factor corresponding to the moving speed of the access network device, the height where the access network device is located, and the height time advance of the access network device; wherein, the first mapping relationship includes the corresponding relationship between the moving speed of at least one access network device, the height where the access network device is located, the height time advance of the access network device, and the TA scaling factor.

[0025] In an embodiment of the first aspect of the present application, the determining the TA scaling factor according to the moving speed of the access network device, the height where the access network device is located, and the height time advance of the access network device includes:

[0026] By looking up the second mapping relationship, determine the TA scaling factor corresponding to the subcarrier spacing of the terminal device, the moving speed of the access network device, the height where the access network device is located, and the height time advance of the access network device; wherein, the second mapping relationship includes the corresponding relationship between the subcarrier spacing of at least one terminal device, the moving speed of the access network device, the height where the access network device is located, the height time advance of the access network device, and the TA scaling factor.

[0027] In summary, in the TA determination method of the terminal device provided in this embodiment, by means of looking up the mapping relationship, the terminal device can obtain the TA that needs to be adjusted with less computational effort, thereby improving the speed and efficiency of the terminal device in determining the TA.

[0028] In an embodiment of the first aspect of the present application, the determining the TA scaling factor includes: determining the TA scaling factor according to the format of the random access preamble used by the terminal device during the random access of the access network device.

[0029] In an embodiment of the first aspect of the present application, the determining the second TA according to the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA includes:

[0030] Determine the second TA according to the TA offset parameter, the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA; wherein, the TA offset parameter is used to perform an offset processing on the TA adjustment amount of the terminal device.

[0031] In an embodiment of the first aspect of the present application, before obtaining the TA adjustment parameter from the access network device, it further includes:

[0032] Receive the indication information sent by the access network device; the indication information is used to indicate the common delay of the cell where the terminal device is located.

[0033] Determine the common delay according to the indication information.

[0034] In an embodiment of the first aspect of the present application, before obtaining the TA adjustment parameter from the access network device, it further includes:

[0035] When the terminal device first accesses the access network device, obtain the TA initial parameter from the access network device;

[0036] Determine the initial TA according to the common delay, the TA initial parameter, and the subcarrier spacing parameter.

[0037] In an embodiment of the first aspect of the present application, the common delay includes: the height time advance of the access network device and the angular time advance of the cell where the terminal device is located.

[0038] In summary, in the method for determining the TA of the terminal device provided in this embodiment, the terminal device can jointly determine the initial TA of the terminal device according to the common delay indicated by the access network device and the TA initial parameter. Since the terminal device can determine the initial TA according to the common delay indicated by the access network device, the method for determining the TA of the terminal device can be applied to a radar base station, and the radar base station can compensate the TA of the terminal device based on the height of the radar and the angle of the cell.

[0039] In an embodiment of the first aspect of the present application, if the terminal device is in a stationary state, determine the TA change rate of the terminal device; wherein, the TA change rate is used to represent the TA adjustment amount in the cell where the terminal device is located caused by the movement of the access network device;

[0040] Determine the fourth TA according to the TA change rate, the third TA, the TA adjustment parameter, and the subcarrier spacing parameter; wherein, the third TA is the TA used by the terminal device when communicating with the access network device before determining the fourth TA.

[0041] In an embodiment of the first aspect of the present application, the determining the fourth TA according to the TA change rate, the third TA, the TA adjustment parameter, and the subcarrier spacing parameter includes:

[0042] Calculate the fourth TA through the formula TA4 = TA3 + △N TA + △N' TA ·△t, where △N TA =(T A -31)·16·64 / 2 μ , T A is the TA adjustment parameter sent by the access network device, and △N' TAFor the TA adjustment amount, Δt = t1 - t0, where t0 is the time when the terminal device receives the TA adjustment parameter, and t1 is the time when the terminal device is about to send uplink communication data to the access network device.

[0043] In an embodiment of the first aspect of the present application, determining the TA change rate of the terminal device includes:

[0044] Determining the TA change rate of the terminal device according to a third mapping relationship; wherein, the third mapping relationship includes: the correspondence between the Doppler frequency shift of at least one of the access network devices and the TA change rate of the terminal device.

[0045] In summary, in the TA determination method of the terminal device provided in this embodiment, the terminal device itself can perform pre - compensation for the TA adjustment according to parameters such as Doppler, thereby avoiding frequent indication of TA adjustment by the satellite base station and reducing resource overhead. At the same time, due to the large communication delay between the satellite base station and the terminal device, using this embodiment for self - pre - compensation can reduce the TA error introduced by the delay when the satellite base station indicates to adjust the TA.

[0046] A second aspect of the present application provides a TA determination method for a terminal device, including:

[0047] Determining a TA adjustment parameter for the terminal device; wherein, the TA adjustment parameter is used to indicate the TA adjustment amount of the terminal device.

[0048] Sending the TA adjustment parameter to the terminal device, so that the terminal device determines a second TA according to the TA adjustment parameter, a TA scaling factor, a sub - carrier spacing parameter, and the first TA; wherein, the TA scaling factor is used to scale the TA adjustment amount of the terminal device, and the first TA is the TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameter.

[0049] In an embodiment of the second aspect of the present application, it further includes: sending indication information to the terminal device, where the indication information is used to indicate the common delay of the cell where the terminal device is located.

[0050] In an embodiment of the second aspect of the present application, the common delay includes: the height time advance amount of the access network device and the angular time advance amount of the cell where the terminal device is located.

[0051] In an embodiment of the second aspect of the present application, sending the indication information to the terminal device includes: broadcasting the common delay in the cell where the terminal device is located; or,

[0052] Broadcast the height timing advance in the coverage area of the access network device, and broadcast the angle timing advance in the cell where the terminal device is located.

[0053] The third aspect of this application provides a TA determination device for a terminal device, which is used to execute the TA determination method for the terminal device as described in the first aspect of this application. The device includes:

[0054] A transceiver module, configured to obtain TA adjustment parameters from an access network device; wherein, the TA adjustment parameters are used to indicate the TA adjustment amount of the terminal device;

[0055] A parameter determination module, configured to determine the TA scaling factor of the terminal device, the subcarrier spacing parameter of the terminal device, and the first TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameters; wherein, the TA scaling factor is used to scale the TA adjustment amount of the terminal device;

[0056] A TA determination module, configured to determine a second TA according to the TA adjustment parameters, the TA scaling factor, the subcarrier spacing parameter, and the first TA.

[0057] In an embodiment of the third aspect of this application, the TA determination module is specifically configured to calculate TA2 through the formula TA2 = TA1 + k·(T A -31)·16·64 / 2 μ ;

[0058] wherein, TA1 is the first TA, T A is the TA adjustment parameter, k is the TA scaling factor, 2 μ is the subcarrier spacing parameter, Δf = 2 μ ·15[kHz], and △f is the subcarrier spacing of the terminal device.

[0059] In an embodiment of the third aspect of this application, the parameter determination module is specifically configured to determine the TA scaling factor according to the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA.

[0060] In an embodiment of the third aspect of this application, the parameter determination module is specifically configured to calculate the TA scaling factor k through the formula 2(v1 + v2) / f TA / c = k·32·16·64·T c / 8;

[0061] wherein, v1 is the maximum moving speed of the terminal device, v2 is the moving speed of the access network device, f TAInstruct the access network device to indicate the terminal device to adjust the frequency of the TA, where c is the speed of light and T c is the basic time unit.

[0062] In an embodiment of the third aspect of the present application, the parameter determination module is further configured to determine whether the TA adjustment amount of the terminal device after being processed by the TA scaling factor meets a preset condition;

[0063] If so, determine a second TA according to the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA.

[0064] In an embodiment of the third aspect of the present application, the parameter determination module is specifically configured to determine the TA scaling factor according to the moving speed of the access network device, the height where the access network device is located, and the height time advance of the access network device.

[0065] In an embodiment of the third aspect of the present application, the parameter determination module is specifically configured to determine the TA scaling factor corresponding to the moving speed of the access network device, the height where the access network device is located, and the height time advance of the access network device by looking up a first mapping relationship; wherein, the first mapping relationship includes the corresponding relationships between the moving speed of at least one access network device, the height where the access network device is located, the height time advance of the access network device, and the TA scaling factor.

[0066] In an embodiment of the third aspect of the present application, the parameter determination module is specifically configured to determine the TA scaling factor corresponding to the subcarrier spacing of the terminal device, the moving speed of the access network device, the height where the access network device is located, and the height time advance of the access network device by looking up a second mapping relationship; wherein, the second mapping relationship includes the corresponding relationships between the subcarrier spacing of at least one terminal device, the moving speed of the access network device, the height where the access network device is located, the height time advance of the access network device, and the TA scaling factor.

[0067] In an embodiment of the third aspect of the present application, the parameter determination module is specifically configured to determine the TA scaling factor according to the format of the random access preamble used by the terminal device during the random access to the access network device.

[0068] In an embodiment of the third aspect of the present application, the TA determination module is further configured to determine a second TA according to the TA offset parameter, the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA; wherein, the TA offset parameter is used to perform an offset process on the TA adjustment amount of the terminal device.

[0069] In an embodiment of the third aspect of the present application, the transceiver module is further configured to receive indication information sent by the access network device; the indication information is used to indicate the common delay of the cell where the terminal device is located.

[0070] In an embodiment of the third aspect of the present application, the parameter determination module is further configured to determine the common delay according to the indication information.

[0071] In an embodiment of the third aspect of the present application, the transceiver module is further configured to obtain TA initial parameters from the access network device when the terminal device first accesses the access network device.

[0072] The TA determination module is further configured to determine an initial TA according to the common delay, the TA initial parameters, and the subcarrier spacing parameter.

[0073] In an embodiment of the third aspect of the present application, the common delay includes: the height time advance of the access network device and the angular time advance of the cell where the terminal device is located.

[0074] In an embodiment of the third aspect of the present application, the parameter determination module is further configured to determine the TA change rate of the terminal device if the terminal device is in a stationary state; wherein the TA change rate is used to represent the TA adjustment amount in the cell where the terminal device is located caused by the movement of the access network device.

[0075] The TA determination module is further configured to determine a fourth TA according to the TA change rate, the third TA, the TA adjustment parameter, and the subcarrier spacing parameter; wherein the third TA is the TA used by the terminal device when communicating with the access network device before determining the fourth TA.

[0076] In an embodiment of the third aspect of the present application, the TA determination module is further configured to calculate the fourth TA through the formula TA4 = TA3 + △N TA + △N' TA ·△t, where △N TA =(T A -31)·16·64 / 2 μ , T A is the TA adjustment parameter sent by the access network device, △N' TA is the TA adjustment amount, △t = t1 - t0, t0 is the time when the terminal device receives the TA adjustment parameter, and t1 is the time when the terminal device is about to send uplink communication data to the access network device.

[0077] In an embodiment of the third aspect of the present application, the parameter determination module is further configured to determine the TA change rate of the terminal device according to a third mapping relationship; wherein, the third mapping relationship includes: the correspondence between the Doppler frequency shift of at least one of the access network devices and the TA change rate of the terminal device.

[0078] The fourth aspect of the present application provides a TA determination device for a terminal device, configured to execute the TA determination method for the terminal device in the second aspect of the present application. The device includes:

[0079] A determination module, configured to determine a TA adjustment parameter for the terminal device; wherein, the TA adjustment parameter is used to indicate the TA adjustment amount of the terminal device.

[0080] A transceiver module, configured to send the TA adjustment parameter to the terminal device, so that the terminal device determines a second TA according to the TA adjustment parameter, a TA scaling factor, a subcarrier spacing parameter, and the first TA; wherein, the TA scaling factor is used to scale the TA adjustment amount of the terminal device, and the first TA is the TA used by the terminal device when communicating with the access network device before receiving the TA adjustment parameter.

[0081] In an embodiment of the fourth aspect of the present application, the transceiver module is further configured to send indication information to the terminal device, and the indication information is used to indicate the common delay of the cell where the terminal device is located.

[0082] In an embodiment of the fourth aspect of the present application, the common delay includes: the height time advance of the access network device and the angular time advance of the cell where the terminal device is located.

[0083] In an embodiment of the fourth aspect of the present application, the transceiver module is specifically configured to broadcast the common delay in the cell where the terminal device is located; or broadcast the height time advance in the coverage area of the access network device and broadcast the angular time advance in the cell where the terminal device is located.

[0084] A fifth aspect of the present application provides a communication device, which may be a terminal device. The communication device includes: a communication interface, a processor, and a memory; wherein, the communication interface is configured to obtain TA adjustment parameters from an access network device and send the TA adjustment parameters to the processor; wherein, the TA adjustment parameters are used to indicate the TA adjustment amount of the terminal device; instructions are stored in the memory, and when the processor calls and executes the instructions, the processor, after receiving the TA adjustment parameters, determines the TA scaling factor of the terminal device, the subcarrier spacing parameter of the terminal device, and the first TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameters; wherein, the TA scaling factor is used to scale the TA adjustment amount of the terminal device; a second TA is determined according to the TA adjustment parameters, the TA scaling factor, the subcarrier spacing parameter, and the first TA.

[0085] In an embodiment of the fifth aspect of the present application, the processor is specifically configured to calculate TA2 through the formula TA2 = TA1 + k·(T A -31)·16·64 / 2 μ ;

[0086] wherein, TA1 is the first TA, T A is the TA adjustment parameter, k is the TA scaling factor, 2 μ is the subcarrier spacing parameter, Δf = 2 μ ·15[kHz], and △f is the subcarrier spacing of the terminal device.

[0087] In an embodiment of the fifth aspect of the present application, the processor is specifically configured to determine the TA scaling factor according to the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA.

[0088] In an embodiment of the fifth aspect of the present application, the processor is specifically configured to calculate the TA scaling factor k through the formula 2(v1 + v2) / f TA / c = k·32·16·64·T c / 8;

[0089] wherein, v1 is the maximum moving speed of the terminal device, v2 is the moving speed of the access network device, f TA is the frequency at which the access network device instructs the terminal device to adjust the TA, c is the speed of light, and T c is the basic time unit.

[0090] In an embodiment of the fifth aspect of the present application, the processor is further configured to determine whether the TA adjustment amount of the terminal device after being processed by the TA scaling factor meets a preset condition;

[0091] If so, determine a second TA according to the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA.

[0092] In an embodiment of the fifth aspect of the present application, the processor is specifically configured to determine the TA scaling factor according to the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device.

[0093] In an embodiment of the fifth aspect of the present application, the processor is specifically configured to determine the TA scaling factor corresponding to the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device by looking up a first mapping relationship; wherein, the first mapping relationship includes the corresponding relationships between the moving speed of at least one access network device, the height where the access network device is located, the height time advance amount of the access network device, and the TA scaling factor.

[0094] In an embodiment of the fifth aspect of the present application, the processor is specifically configured to determine the TA scaling factor corresponding to the subcarrier spacing of the terminal device, the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device by looking up a second mapping relationship; wherein, the second mapping relationship includes the corresponding relationships between the subcarrier spacing of at least one terminal device, the moving speed of the access network device, the height where the access network device is located, the height time advance amount of the access network device, and the TA scaling factor.

[0095] In an embodiment of the fifth aspect of the present application, the processor is specifically configured to determine the TA scaling factor according to the format of the random access preamble used by the terminal device during the random access to the access network device.

[0096] In an embodiment of the fifth aspect of the present application, the processor is further configured to determine a second TA according to the TA offset parameter, the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA; wherein, the TA offset parameter is used to perform an offset process on the TA adjustment amount of the terminal device.

[0097] In an embodiment of the fifth aspect of the present application, the communication interface is further configured to receive the indication information sent by the access network device and send the indication information to the processor; the indication information is used to indicate the common delay of the cell where the terminal device is located.

[0098] In an embodiment of the fifth aspect of the present application, the processor is further configured to determine the common delay according to the indication information when receiving the indication information.

[0099] In an embodiment of the fifth aspect of the present application, the communication interface is further configured to, when the terminal device first accesses the access network device, obtain the TA initial parameters from the access network device and send the TA initial parameters to the processor.

[0100] The processor is further configured to determine the initial TA according to the common delay, the TA initial parameters, and the subcarrier spacing parameter when receiving the TA initial parameters.

[0101] In an embodiment of the fifth aspect of the present application, the common delay includes: the height time advance of the access network device and the angular time advance of the cell where the terminal device is located.

[0102] In an embodiment of the fifth aspect of the present application, the processing module is further configured to determine the TA change rate of the terminal device if the terminal device is in a stationary state; wherein the TA change rate is used to represent the TA adjustment amount in the cell where the terminal device is located caused by the movement of the access network device.

[0103] The processing is further configured to determine the fourth TA according to the TA change rate, the third TA, the TA adjustment parameter, and the subcarrier spacing parameter; wherein the third TA is the TA used by the terminal device when communicating with the access network device before determining the fourth TA.

[0104] In an embodiment of the fifth aspect of the present application, the processor is further configured to calculate the fourth TA through the formula TA4 = TA3 + △N TA + △N' TA ·△t, where △N TA =(T A -31)·16·64 / 2 μ , T A is the TA adjustment parameter sent by the access network device, △N' TA is the TA adjustment amount, △t = t1 - t0, t0 is the time when the terminal device receives the TA adjustment parameter, and t1 is the time when the terminal device is about to send uplink communication data to the access network device.

[0105] In an embodiment of the fifth aspect of the present application, the processor is further configured to determine the TA change rate of the terminal device according to the third mapping relationship; wherein the third mapping relationship includes: the correspondence between the Doppler frequency shift of at least one access network device and the TA change rate of the terminal device.

[0106] A sixth aspect of the present application provides a communication device, which may be an access network device. More specifically, the communication device may be a radar base station. The communication device includes: a communication interface, a processor, and a memory. Among them, instructions are stored in the memory. When the processor calls and executes the instructions, the processor determines TA adjustment parameters of a terminal device and sends the TA adjustment parameters to the communication interface. Among them, the TA adjustment parameters are used to indicate the TA adjustment amount of the terminal device. When the communication interface receives the TA adjustment parameters, it sends the TA adjustment parameters to the terminal device, so that the terminal device determines a second TA according to the TA adjustment parameters, a TA scaling factor, a subcarrier spacing parameter, and the first TA. Among them, the TA scaling factor is used to scale the TA adjustment amount of the terminal device, and the first TA is the TA used by the terminal device when communicating with the access network device before the terminal device receives the TA adjustment parameters.

[0107] In an embodiment of the sixth aspect of the present application, the communication interface is further configured to send indication information to the terminal device, and the indication information is used to indicate the common delay of the cell where the terminal device is located.

[0108] In an embodiment of the sixth aspect of the present application, the common delay includes: the height time advance of the access network device and the angular time advance of the cell where the terminal device is located.

[0109] In an embodiment of the sixth aspect of the present application, the communication interface is specifically configured to broadcast the common delay in the cell where the terminal device is located; or broadcast the height time advance in the coverage area of the access network device and broadcast the angular time advance in the cell where the terminal device is located.

[0110] A seventh aspect, an embodiment of the present application further provides a computer-readable storage medium, including instructions, which when running on a computer, cause the computer to execute the method described in the first aspect of the present application.

[0111] An eighth aspect, an embodiment of the present application further provides a computer-readable storage medium, including instructions, which when running on a computer, cause the computer to execute the method described in the second aspect of the present application.

[0112] A ninth aspect, an embodiment of the present application provides a communication system. The system includes the device described in the third aspect above and the device described in the fourth aspect above; or the system includes the communication device described in the fifth aspect above and the communication device described in the sixth aspect above. Description of the Drawings

[0113] Figure 1 Schematic diagram of a communication system applied in the prior art;

[0114] Figure 2 Schematic diagram of the communication system applied in this application;

[0115] Figure 3 Flow schematic diagram of an embodiment of the TA determination method for the terminal device provided in this application;

[0116] Figure 4 Schematic diagram of the common delay of the cell where the terminal device provided in this application is located;

[0117] Figure 5 Schematic diagram of the position of the satellite base station in this application;

[0118] Figure 6 Corresponding relationship between the position of the satellite base station and the TA of the terminal device in this application;

[0119] Figure 7 Flow schematic diagram of an embodiment of the TA determination method for the terminal device provided in this application;

[0120] Figure 8 Flow schematic diagram of an embodiment of the TA determination method for the terminal device provided in this application;

[0121] Figure 9 Schematic diagram of the Doppler frequency shift of the access network device provided in this application;

[0122] Figure 10 Schematic diagram of the TA change rate of the terminal device provided in this application;

[0123] Figure 11 Schematic diagram of the terminal device provided in this application for determining the fourth TA;

[0124] Figure 12 Schematic diagram of dividing cells according to the TA change rate provided in this application Figure 1 ;

[0125] Figure 13 Schematic diagram of dividing cells according to the TA change rate provided in this application Figure 2 ;

[0126] Figure 14 Schematic diagram of the structure of an embodiment of the terminal device provided in this application;

[0127] Figure 15 Schematic diagram of the structure of an embodiment of the access network device provided in this application;

[0128] Figure 16 Schematic diagram of the structure of an embodiment of the communication device provided in this application. Detailed implementation manners

[0129] Figure 1 A schematic diagram of a communication system applied in the prior art. As Figure 1 shown in the communication scenario, it includes: a terminal device A, a terminal device B, and an access network device. After the terminal device establishes a communication connection with the access network device, it can further communicate with the core network through the access network device. For example, in the example shown in Figure 1 , when the access network device is the base station E, within the coverage area of the base station E, both the terminal device A and the terminal device B can access the base station E and communicate with the base station E through the established wireless connection relationship. The communication includes: the terminal device sending uplink communication data to the base station, and the base station sending uplink communication data to the terminal.

[0130] In the prior art, when the distance between the terminal device and the base station is relatively far, there will be a large transmission delay in the uplink communication data sent by the terminal device to the base station, and the uplink communication data sent by different terminal devices within the coverage area of the base station will exhibit different transmission delays. For example, in the example shown in Figure 1 , the uplink communication data sent by the terminal device A to the base station E will have a transmission delay of TA1, while the uplink communication data sent by the terminal device B to the base station E will have a transmission delay of TA2. Since the distance between the terminal device B and the base station E is greater than the distance between the terminal device A and the base station, the transmission delay TA2 > TA1. Therefore, in order to ensure the time synchronization of the uplink communication data of the terminal device received by the base station side, the base station will set a timing advance (TA) for each accessed terminal device, so that the terminal device can obtain a negative offset between the first time of receiving the downlink communication data sent by the base station through the TA and the second time of the terminal device sending the uplink communication data to the base station. The base station controls the time when the accessed terminal device sends the uplink communication data to control the time when the base station receives the uplink communication data of the terminal device.

[0131] For example: In some specific implementation manners, when the terminal device is randomly accessing the base station, the base station will determine the TA of the terminal device according to the random access preamble sent by the terminal device, and send the TA initial parameter to the terminal device through the TAC field, so that the terminal device can determine the initial TA according to the TA initial parameter. Due to the mobility of the terminal device, the base station needs to continuously instruct the terminal device to adjust its TA after the terminal device determines the initial TA. Among them, after the base station receives the uplink communication data sent by the terminal device, it determines the TA adjustment amount for adjusting the TA of the terminal device by measuring the relevant parameters of the uplink communication data, and also sends the TA adjustment parameter to the terminal device through the TAC field, so that the terminal device can adjust the TA according to the TA adjustment parameter.

[0132] Figure 2 A schematic diagram of the communication system applied in this application, as Figure 2 shown, the application scenario is the communication scenario of a satellite base station. This communication system includes: a satellite base station and at least one terminal device. Alternatively, in some specific implementation manners, as Figure 2 shown, the communication system further includes a ground base station not shown. The ground base station and the satellite base station jointly provide services for the terminal device. Among them, based on the advantages of the satellite base station having a wider coverage range and not being easily damaged by natural disasters or external forces, etc., it can provide communication services for some areas that cannot be covered by the ground communication network, such as the ocean and forests, and has characteristics such as wide coverage, reliability, multi-connection, and high throughput.

[0133] In each embodiment of this application, the terminal device can also be referred to as a terminal. The terminal device can be a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc. The terminal device can also be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, a wireless terminal device in a smart home, and so on.

[0134] Since the distance between the terminal device and the satellite base station is relatively far, the satellite base station also needs to instruct each terminal device accessing the satellite base station to determine its TA to achieve time synchronization for the base station to receive the uplink communication data of the terminal device. And in as Figure 1In the prior art shown, the base station E of the ground communication network is fixed in position, and only the mobility of the terminal device is considered when the terminal device determines the TA. In communication systems such as the fifth generation mobile network new radio access technology (5G NR), the adjustment range of the base station in the ground communication network when adjusting the TA of the terminal device each time and the total range that can be adjusted within a period of time are restricted.

[0135] In such Figure 2 In the communication scenario shown, based on the fact that existing satellite base stations are generally in a state of continuous movement, for example, at the first moment, the terminal device C is at position C in the figure and the satellite base station is at position C' in the figure. At this time, the uplink communication data sent by the terminal device to the satellite base station will have a transmission delay of TA3, so the terminal device needs to send the uplink communication data in advance with the time advance of TA3. At the second moment, in addition to the terminal device moving from position C to position D, the satellite base station also moves from position C' to D', which together causes the uplink communication data sent by the terminal device to the satellite base station to have a transmission delay of TA4. Therefore, the terminal device needs to send the uplink communication data in advance with the time advance of TA4. Obviously, since the distance between position D-position D' is greater than the distance between position C-position C', TA4>TA3.

[0136] For example, in the 5G NR communication system, when the terminal device determines the TA, the frequency of determining the TA and the maximum TA adjustment amount are limited, and the mobility of the base station is not considered. Figure 2 In the satellite communication system shown, since the satellite base station itself is also mobile and the moving speed of the satellite base station is much faster than the moving speed of the terminal device, the existing TA determination method of the terminal device cannot be directly applied to the satellite base station. Therefore, how to make the TA determination method of the terminal device applicable to the satellite base station is a technical problem to be solved in this field.

[0137] The TA determination method of the terminal device provided in the present application is described below in conjunction with the accompanying drawings.

[0138] Figure 3 A flow chart of an embodiment of a TA determination method for a terminal device provided in the present application is shown as follows: Figure 3 As shown, the TA determination method of the terminal device provided in this implementation includes:

[0139] S101: The access network device sends indication information to the terminal device.

[0140] Specifically, the access network device in this embodiment includes a satellite base station. In order to compensate the TA value when determining the initial TA during the process of the terminal device accessing the satellite base station, the access network device needs to send indication information to the terminal device that can indicate the common delay of the cell where the terminal device is located.

[0141] Among them, the common delay described in this embodiment includes: the height time advance TA(h) of the access network device and the angular time advance TA(θ) of the cell where the terminal device is located.

[0142] For example, Figure 4 is a schematic diagram of the common delay of the cell where the terminal device provided by this application is located. Within the coverage range S of the satellite base station O in Figure 4 the common delays in different cells are different.

[0143] Taking the cell S1 directly below the satellite base station O as an example, when the terminal device at point a directly below the satellite base station O in this cell sends uplink communication data to the satellite base station O, there will be a time delay between a - O due to the height h of the satellite base station 0. In this embodiment, this time delay is denoted as the height time advance TA(h). That is, all terminal devices within the coverage range S of the satellite base station O need to compensate for at least this common delay when sending uplink communication data to the satellite base station O, that is, they all need to compensate for TA(h).

[0144] In addition to the cell S1 directly below the satellite base station O, when terminal devices in other cells within the coverage range S send uplink communication data to the satellite base station, they also need to consider the angular time advance of each cell. For example, taking the base station S2 as shown in Figure 4 as an example, point c in this cell is the position closest to point a directly below the satellite base station O. When the terminal device is located at position c, there will be a height time advance TA(h) due to the height h of the satellite base station, and there will also be an angular time advance TA(θ) due to the angle θ between point c and the satellite base station O. That is, when the terminal device at point c sends uplink communication data to the satellite base station O, the common delay that needs to be compensated between c - O consists of the height time advance TA(h) from 0 - b and the angular time advance TA(θ) between b - c. Therefore, for all terminal devices in cell S2 when sending uplink transmission data to the satellite base station, there is at least the above time delay, that is, they all need to compensate for the common delay, that is, TA(h)+TA(θ).

[0145] For each terminal device in cell S2, the distance from it to point a will not be exactly the same. Different distances will result in different TA compensation values required for different terminal devices even within the same cell. For example, at point e, the farthest position from point a within cell S2, in addition to compensating for TA(h)+TA(θ), the terminal device at point e also needs to be additionally compensated by △TA. Finally, for the terminal devices in cell S2, the TA compensation that the radar base station needs to perform includes: TA(h)+TA(θ)+△TA. For example, Figure 5 is a schematic diagram of the position of the satellite base station in this embodiment. Here, R is the radius of the earth, and h is the orbital altitude of the satellite base station orbiting the earth. Then, when the satellite base station presents an α angle with its initial position during the process of orbiting the earth, the relationship between the position of the satellite base station and the change of TA can be referred to Figure 6 , where Figure 6 is the corresponding relationship between the position of the satellite base station in this application and the TA of the terminal device. As Figure 6 shown, for a certain cell within the coverage of the satellite base station at the moment of 150s in the figure, with a height of about 1300km and an angle α of about 0.33rad, the TA of the terminal devices in this cell includes TA(h)+TA(θ)+△TA. Optionally, when the terminal device accesses the satellite base station, the satellite base station will send △TA to the terminal device to compensate for the TA of the terminal device.

[0146] Therefore, in S101, in order to enable the terminal device to determine the common delay that needs to be compensated when communicating with the satellite base station, the satellite base station needs to send indication information to the terminal devices within its coverage, so that the terminal devices can determine the common time delay of their respective cells according to the indication information.

[0147] Optionally, in the first possible implementation manner of S101, the satellite base station can broadcast the common delay corresponding to each cell. For example, in the scenario as Figure 4 shown, the satellite base station O broadcasts the common delay TA(h) corresponding to cell S1 within cell S1, and broadcasts the common delay TA(h)+TA(θ) corresponding to cell S2 within cell S2.

[0148] Or, in the second possible implementation manner of S101, since all terminal devices within the coverage S of the satellite base station O have a delay of TA(h), therefore, the satellite base station O can broadcast TA(h) within its coverage S, and broadcast TA(θ) corresponding to each cell within each cell.

[0149] Alternatively, in the third possible implementation manner of S101, the satellite base station may indicate the common delay of the cell where the terminal device is located in an implicit indication manner. For example, if there is a corresponding relationship between the cell ID of the satellite base station or the ID of the radar beam and the common delay in the cell, the indication information may be the cell ID or beam ID sent by the satellite base station to the terminal device, so that the terminal device determines the corresponding common delay according to the cell ID or beam ID sent by the satellite base station. Among them, the corresponding relationship may be sent by the satellite base station to the terminal device, or the corresponding relationship may be obtained through negotiation between the satellite base station and the terminal device. Alternatively, the corresponding relationship may be stored in the terminal device.

[0150] S102: The access network device sends TA initial parameters to the terminal device, so that the terminal device determines the initial TA.

[0151] Specifically, when the terminal device first accesses the access network device, it can obtain the TA initial parameters from the access network device. For example, during the random access process of the terminal device to the radar base station, the radar base station sends the TA initial parameters to the terminal device through the TAC (timing advance command) field in the random access response message (RAR). The TA initial parameters include 12 bits, and the range of the TA initial parameters is 0 - 3846.

[0152] S103: The terminal device jointly determines the initial TA according to the indication information and the TA initial parameters.

[0153] Specifically, the terminal device can use the formula N TA0 = TA(h) + TA(θ) + T A0 · 16 · 64 / 2 μ , to obtain the initial TA, where TA(h) + TA(θ) is the common delay, T AO is the TA initial parameter, 2 μ is the subcarrier spacing parameter. For the subcarrier spacing parameter, there is Δf = 2 μ · 15 [kHz], Δf is the subcarrier spacing of the terminal device, and the time unit of N TA0 is Tc = 0.509 ns, which is the basic time unit defined in the TS 38.211 standard.

[0154] S104: The terminal device communicates with the access network device using the initial TA.

[0155] Finally, after the terminal device determines its initial TA through the above steps, it can use the initial TA to communicate with the access network device. For example, when the access network device is a radar base station, the communication mentioned above means that the terminal device needs to send uplink transmission data to the radar base station in advance by the time of the TA.

[0156] In summary, in the TA determination method of the terminal device provided in this embodiment, the terminal device can jointly determine the initial TA of the terminal device according to the common delay indicated by the access network device and the TA initial parameters. Since the terminal device can determine the initial TA according to the common delay indicated by the access network device, the TA determination method of the terminal device can be applied to a radar base station, and the radar base station can compensate the TA of the terminal device based on the height of the radar and the angle of the cell.

[0157] Subsequently, after the terminal device randomly accesses and determines the initial TA, due to the mobility of both the terminal device and the access network device in this embodiment, the terminal device needs to continuously adjust the TA subsequently to meet the real-time requirements of the TA. Among them, as Figure 7 shown, Figure 7 FIG. is a schematic flowchart of an embodiment of the TA determination method of the terminal device provided in this application. As Figure 7 shown, it shows the process of adjusting the TA subsequently after the terminal device has randomly accessed the access network device and obtained the initial TA. Among them, this embodiment can be applied to a communication scenario such as Figure 2 shown. When the access network device is a radar base station, the method includes:

[0158] S201: The access network device sends TA adjustment parameters to the terminal device. Among them, the TA adjustment parameters are used to indicate the TA adjustment amount of the terminal device.

[0159] Specifically, in this embodiment, the access network device can measure the uplink communication data sent by the terminal device received during the communication with the terminal device, and when it determines that the TA of the terminal device needs to be adjusted, it sends TA adjustment parameters to the terminal device, so that the terminal device adjusts its TA according to the TA parameters. Optionally, in this step, the access network device carries the TA adjustment parameters in the TAC sent to the terminal device. The TA adjustment parameters include 6 bits, and the range of the TA adjustment parameters is 0-63.

[0160] S202: The terminal device determines the TA scaling factor, the subcarrier spacing parameter, and the first TA.

[0161] Subsequently, after the terminal device receives the TA adjustment parameters sent by the access network device through S201 and determines that the TA needs to be adjusted, it is necessary to determine the TA scaling factor, subcarrier spacing parameter, and the first TA required for calculating the TA in S202. The TA scaling factor is used to scale the TA adjustment amount of the terminal device. The first TA is the TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameters. The first TA can be the initial TA, or the first TA can also be the TA obtained after being adjusted from the initial TA.

[0162] S203: The terminal device jointly determines the second TA according to the TA adjustment parameters, TA scaling factor, subcarrier spacing parameter, and the first TA.

[0163] Specifically, in this step, the terminal device specifically calculates TA2 through the formula TA2 = TA1 + k·(T A -31)·16·64 / 2 μ ; where T A is the TA adjustment parameter received in S201, TA1 is the first TA determined in S202, k is the TA scaling factor determined in S202, 2 μ is the subcarrier spacing parameter determined in S202. For the subcarrier spacing parameter, there is Δf = 2 μ ·15[kHz], and △f is the subcarrier spacing of the terminal device.

[0164] S204: The terminal device communicates with the access network device using the second TA.

[0165] Finally, the terminal device communicates with the access network device according to the second TA determined through the above steps. Among them, the communication means that the terminal device needs to send uplink transmission data to the access network device at a time ahead of the second TA. It can be understood that in the embodiment as shown in Figure 7 , before the terminal device receives the TA adjustment parameters sent by the access network device in S201, it sends uplink transmission data to the access network device at a time ahead of the first TA; and after S203 determines the TA adjustment parameters, it sends uplink transmission data to the access network device at a time ahead of the second TA.

[0166] In summary, in the TA determination method of the terminal device provided in this embodiment, when the terminal device receives the TA adjustment parameters sent by the access network device and determines that its TA needs to be adjusted, it determines the TA scaling factor, subcarrier spacing parameter, and the first TA to jointly adjust the first TA to obtain the second TA. Since in this embodiment, when the terminal device determines the second TA in S203, the adjustable amount based on the first TA is k·(T A -31)·16·64 / 2μ , compared with the adjustment amount (T A -31)·16·64 / 2 μ specified in the existing 5G NR system, due to the addition of the TA adjustment parameter k, when the terminal device adjusts the TA, the adjustable range is larger, so it can be applied to, for example, Figure 2 the satellite communication system shown in the figure, enabling the terminal device to adjust the TA in the case of mobility jointly caused by the terminal device itself and the satellite base station. Moreover, the TA determination method of the terminal device described in this embodiment can also be applied to the existing ground communication system as shown in Figure 1 the figure. The terminal device can adjust the TA only considering the mobility of the terminal device itself. Therefore, the TA determination method of the terminal device provided in this embodiment can also be applied to both the ground fixed base station and the satellite base station at the same time, having portability.

[0167] Optionally, based on the embodiment shown in Figure 7 the figure, in a possible specific implementation manner of determining the TA scaling factor k in S202, the terminal device specifically determines the TA scaling factor k through the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA. For example: the terminal device can calculate the TA scaling factor k through the formula 2(v1 + v2) / f TA / c = k·32·16·64·T c / 8; where, v1 is the maximum moving speed of the terminal device, v2 is the moving speed of the access network device, f TA is the frequency at which the access network device instructs the terminal device to adjust the TA, c is the speed of light, and the typical value of the speed of light is 299792458 m / s, and T c is the basic time unit.

[0168] Among them, since the value of the TA scaling factor k can be represented by the maximum TA change that the terminal device needs to adjust each time the TA is adjusted, and when the elevation angle between the terminal device and the access network device is the largest and the moving directions of the terminal device and the access network device are opposite, the TA that the terminal device needs to adjust is the largest. Therefore, in the above formula, the sum of the maximum moving speed of the terminal device and the moving speed of the access network device needs to be considered, and at this time, the TA change speed is the largest. When the access network device is a radar base station, since the operating height of the radar base station is known, the speed v2 of the radar base station can be calculated through the formula calculated. Among them, the gravitational constant G = 6.67*10 -11 N m / kg; the weight of the earth M = 5.965*10 24kg, the radius of the Earth R = 6371 km, and the operating altitude of the radar base station is h. The operating altitude h of the radar base station can be obtained through the formula TA(h) = 2h / c, where TA(h) is the altitude time advance in the common delay received by the terminal device from the radar base station. Optionally, in this embodiment, in S203, after the terminal device accesses the access network device, it can determine the subcarrier spacing used during its communication and the frequency at which the access network device instructs the terminal device to adjust TA. The frequency of adjusting TA is the frequency at which the access network device sends TA adjustment parameters to the terminal device as shown in Figure 7 shown.

[0169] Further, based on the above embodiment, when the terminal device operates at its maximum subcarrier spacing, the TA range that the TA adjustment parameters sent by the access network device to the terminal device can indicate is the smallest. Since the TA scaling factor k calculated by the above formula is based on the terminal device operating at its maximum subcarrier spacing, other subcarrier spacings of the terminal device can be satisfied. However, when the subcarrier spacing decreases, if the above TA scaling factor k is still completely used, it will cause a certain degree of decline in the TA adjustment accuracy. Therefore, in this embodiment, it is also possible to judge the situation where the TA adjustment range cannot be satisfied when the TA scaling factor is not added to the TA adjustment parameters. For example, judge whether the TA adjustment amount after processing the TA scaling factor meets a preset condition, and only when 2(v1 + v2) / f TA / c > k·32·16·64·Tc / 8, the formula TA2 = TA1 + k·(T A -31)·16·64 / 2 μ can be used to adjust TA; and when 2(v1 + v2) / f TA / c ≤ k·32·16·64·T c / 8, the formula TA2 = TA1 + (T A -31)·16·64 / 2 μ is used to adjust TA. Thus, when the subcarrier spacing of the terminal device is small, the TA scaling factor will no longer be added to the TA adjustment amount, but the TA will be directly adjusted according to the TA adjustment amount, so as to improve the TA adjustment accuracy of the terminal device when the subcarrier spacing is small.

[0170] In another possible specific implementation manner of determining the TA scaling factor k in S202, the terminal device determines the TA scaling factor specifically based on the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device. For example, the terminal device may determine the TA scaling factor corresponding to the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device by looking up the first mapping relationship; wherein, the first mapping relationship includes the corresponding relationships between the moving speed of at least one access network device, the height where the access network device is located, the height time advance amount of the access network device, and the TA scaling factor.

[0171] For example, the terminal device may store the above first mapping relationship in the form of a table. A specific configuration manner of this table may refer to Table 1. The different corresponding relationships listed in Table 1 are only for illustrative purposes and do not limit the corresponding relationship. Among them, in Table 1, the frequency f at which the access network device instructs the terminal device to adjust the TA TA = 5, that is, the TA is adjusted once every 200 ms, and the maximum moving speed of the terminal device is 1000 KM / h. Therefore, it can be understood that if due to changes in other parameters such as the frequency of adjusting the TA and the moving speed of the terminal device, the corresponding relationships between the moving speed of other access network devices, the height where the access network device is located, the height time advance amount of the access network device, and the TA scaling factor, if only numerical changes occur, they are also within the scope protected by this application.

[0172] Table 1

[0173]

[0174]

[0175] Optionally, on the basis of the embodiment shown in Table 1, in order to reduce the storage space occupied by the terminal device when storing the table, in this embodiment, the height where the access network device is located may also be divided into different levels, each level corresponding to a maximum TA scaling factor k among them, and the data in the table may be further processed by rounding up or with a precision of 0.5 to reduce the storage space. For example, Table 1.1 and Table 1.2 show two possible compression methods for Table 1:

[0176] Table 1.1

[0177]

[0178]

[0179] Table 1.2

[0180]

[0181] Since in the first mapping relationship shown in Table 1, it is default that the terminal device operates with its maximum subcarrier spacing, and in order to improve the TA adjustment accuracy of the terminal device, based on the first mapping relationship, TA adjustment parameter k corresponding to different subcarrier spacings of the terminal device can be further added. Among them, the terminal device can determine the TA scaling factor corresponding to the subcarrier spacing of the terminal device, the moving speed of the access network device, the height where the access network device is located, and the height time advance of the access network device by looking up the second mapping relationship; among them, the second mapping relationship includes the corresponding relationship between at least one subcarrier spacing of the terminal device, the moving speed of the access network device, the height where the access network device is located, the height time advance of the access network device, and the TA scaling factor

[0182] For example, the terminal device can store the above second mapping relationship in the form of a table. A specific configuration method of this table can refer to Table 2. The different corresponding relationships listed in Table 2 are only for illustrative purposes and do not limit the corresponding relationship. Among them, in Table 2, the frequency f at which the access network device instructs the terminal device to adjust the TA TA = 5, that is, the TA is adjusted once every 200 ms, and the maximum moving speed of the terminal device is 1000 KM / h. Therefore, it can be understood that if the corresponding relationship between the subcarrier spacing, the moving speed of the access network device, the height where the access network device is located, the height time advance of the access network device, and the TA scaling factor obtained due to changes in other parameters such as the frequency of adjusting the TA and the moving speed of the terminal device is only a numerical change, it is also within the scope of protection of this application

[0183] Table 2

[0184]

[0185]

[0186]

[0187] Similarly, on the basis of the embodiment shown in Table 2, in order to reduce the storage space occupied by the terminal device when storing the table, in this embodiment, the height where the access network device is located can also be divided into different levels, each level corresponding to a maximum TA scaling factor k among them, and the data in the table can be further processed by rounding up or in the way of accuracy 0.5 to reduce the storage space. For example, Table 2.1 and Table 2.2 show two possible compression methods for Table 2

[0188] Table 2.1

[0189]

[0190] Table 2.2

[0191]

[0192] Optionally, in the third possible specific implementation manner of determining the TA scaling factor k in S202, the terminal device may determine the TA scaling factor k according to the format of the random access preamble used by the terminal device in the random access process.

[0193] During the random access process of the terminal device, the terminal device sends a random access preamble to the access network device to request to establish a connection relationship with the access network device. For cells with different radii of the coverage range of the access network device, the formats of the random access preambles sent by the terminal device to the access network device during the random access process are different. For example, a terminal device in a cell with a radius of 5 km needs to send a random access preamble of format 1 to the access network device during the random access process; while a terminal device in a cell with a radius of 10 km needs to send a random access preamble of format 2 to the access network device during the random access process. At the same time, since the TA adjustment ranges that need to be adjusted for cells with different radii are also different, the larger the radius of the cell, the larger the TA adjustment range, and the smaller the radius of the cell, the smaller the TA adjustment range. Therefore, when determining the TA of the terminal device, a corresponding relationship can be established between the TA adjustment range of the terminal device, that is, the TA scaling factor k, and the format of the random access preamble, so that the terminal device can determine the corresponding TA scaling factor k according to the format of the random access preamble used in the random access process.

[0194] Optionally, the corresponding relationship between the TA scaling factor k and the format of the random access preamble may also be stored in the access network device and / or the terminal device in the form of a table. If the table is stored in the terminal device, then during the random access process of the terminal device, after determining the format of the random access preamble it uses, it can determine the corresponding TA scaling factor k according to the format of the random access preamble. If the table is not stored in the terminal device, then during the random access process of the terminal device, when the terminal device sends a random access preamble to the access network device, the access network device can determine the corresponding TA scaling factor k according to the format of the random access preamble and then return the TA scaling factor k to the terminal device.

[0195] Specifically, in the above embodiment, during the random access process, the length of the cyclic prefix (CP) of the format of the random access preamble sent by the terminal device to the access network device determines the possible TA adjustment range of the terminal device. Further, it determines whether an additional TA scaling factor needs to be introduced when determining the TA, and determines the specific value of the TA scaling factor. Therefore, the scaling factor k can be determined according to the format of the random access used.

[0196] Among them, the TA scaling factor k can be determined according to the maximum CP length of the random access preamble format configured for the cell or beam, so that the TA scaling factor value is common to the entire cell or beam. Alternatively, the scaling factor k can be determined according to the CP length of the random access preamble format selected by each user (group), so that different users can use different TA scaling factors k to minimize the accuracy loss caused by using the scaling factor as much as possible.

[0197] Optionally, in the above embodiments of the present application, the method for determining the TA scaling factor k of the terminal device can be jointly agreed upon by the terminal device and the access network device in advance, so as to ensure that the TA calculated by the terminal device can cover the TA adjustment range sufficiently.

[0198] Optionally, in another embodiment of the present application, when the terminal device adjusts the TA through the formula TA2 = TA1 + k·(T A -31)·16·64 / 2 μ in S203, an offset parameter offset can also be added to the TA adjustment amount, that is, the TA is adjusted through the formula TA2 = TA1 + k·(T A -31)·16·64 / 2 μ + offset. Thereby, the adjustment range of the TA of the terminal device is further expanded. The offset parameter can be a fixed value, can be obtained through a function related to the TA adjustment parameter k, or can also be obtained through a function related to the height of the access network device.

[0199] Furthermore, in the method for the terminal device to determine the TA provided in the above embodiments, the mobility of both the terminal device and the access network device is considered. When the access network device is a satellite base station, since the movement trajectory of the satellite base station is relatively fixed, when the terminal device is in a stationary state, the TA change rule of the terminal device caused by the movement of the satellite base station is also fixed. Therefore, if the terminal device knows information such as the orbital height of the satellite base station and the location of the terminal device, it can directly determine the TA adjustment amount that needs to be adjusted by itself without the indication of the satellite base station, and perform pre-compensation on the TA.

[0200] Specifically, Figure 8 is a schematic flow chart of an embodiment of the method for the terminal device to determine the TA provided by the present application. As Figure 8 shown, the method for the terminal device to determine the TA includes:

[0201] S301: If the terminal device is in a stationary state, determine the TA change rate of the terminal device, where the TA change rate is used to represent the TA adjustment amount in the cell where the terminal device is located caused by the movement of the access network device.

[0202] Among them, in a specific implementation manner of S301, the terminal device may determine the TA change rate of the terminal device according to the third mapping relationship; wherein, the third mapping relationship includes: the correspondence between the Doppler frequency shift of at least one access network device and the TA change rate of the terminal device.

[0203] For example, the terminal device may determine the TA change rate of the terminal device according to the measured Doppler frequency shift of the access network device, and the corresponding relationship is D TA =-λFd, where D TA is the change rate of TA, λ is the wavelength of the wireless communication signal sent by the access network device, and Fd is the Doppler frequency shift. Reference can be made to Figure 9 and Figure 10 , where Figure 9 is a schematic diagram of the Doppler frequency shift of the access network device provided by this application, Figure 10 is a schematic diagram of the TA change rate of the terminal device provided by this application. As Figure 9 and Figure 10 the corresponding relationship between them shows that there is an inverse proportional relationship between the Doppler frequency shift of the access network device and the TA change rate of the terminal device.

[0204] S302: The terminal device determines the fourth TA according to the TA change rate, the third TA, the TA adjustment parameter, and the subcarrier spacing parameter; wherein, the third TA is the TA used by the terminal device when communicating with the access network device before determining the fourth TA.

[0205] Specifically, the terminal device may calculate the fourth TA through the formula TA4 = TA3 + △N TA + △N' TA ·△t, where △N TA =(T A -31)·16·64 / 2 μ , T A is the TA adjustment parameter sent by the access network device, △N' TA is the TA adjustment amount determined in S301, △t = t1 - t0, where t0 is the time when the terminal device receives the TA adjustment parameter, and t1 is the time when the terminal device is about to send uplink communication data to the access network device.

[0206] S303: The terminal device communicates with the access network device using the fourth TA.

[0207] Finally, the terminal device communicates with the access network device according to the fourth TA determined through the above steps. Among them, the communication means that the terminal device needs to send uplink transmission data to the access network device in advance for the time of the fourth TA. It can be understood that in such as Figure 8 ​In the illustrated embodiment, before the terminal device determines the fourth TA, uplink transmission data is sent to the access network device in advance by the time of the third TA; and after the fourth TA is determined in S302, uplink transmission data is sent to the access network device in advance by the time of the fourth TA.

[0208] For example, Figure 11 is a schematic diagram for the terminal device provided in this application to determine the fourth TA. As Figure 11 shown, when the terminal device receives the TA adjustment parameter indicated by the satellite base station at time t0 and determines the TA adjustment amount △TA_1, before the satellite base station indicates the next TA adjustment parameter to determine the TA adjustment amount △TA_2, the terminal device estimates that the TA adjustment amount within a future period of time t0 - t1 is △TA', and calculates the fourth TA through the formula TA4 = TA3 + △TA_1 + △TA'·(t0 - t1), and uses the fourth TA to send uplink communication data to the satellite base station at time t1.

[0209] Optionally, after the terminal device performs TA pre-compensation by itself according to the Doppler frequency shift, there will still be a certain TA deviation. Therefore, the satellite base station can estimate the corresponding TA deviation based on the uplink signal of the terminal device received and then send it to the terminal device again to maintain the accuracy of the terminal device during TA compensation.

[0210] In summary, in the TA determination method of the terminal device provided in this embodiment, the terminal device itself can pre-compensate the TA adjustment according to parameters such as Doppler, thereby avoiding frequent indication of TA adjustment by the satellite base station and reducing resource overhead. At the same time, due to the large communication delay between the satellite base station and the terminal device, using this embodiment for self-pre-compensation can reduce the TA error introduced by the delay when the satellite base station indicates TA adjustment.

[0211] It should be noted that the embodiment shown in Figure 8 can be implemented alone, or, the embodiment shown in Figure 8 can be based on the embodiment shown in Figure 7 When the access network device makes the terminal device adjust the TA by sending TA adjustment parameters, before the access network device sends the TA adjustment parameters next time, the terminal device can, according to the method shown in Figure 8 make self-adjustment to the TA without the indication of the access network device.

[0212] Optionally, in Figure 8In the illustrated embodiment, in another possible implementation of S301 to determine the TA change rate of the terminal device, the terminal device may determine its TA change rate according to the corresponding relationship between the cell where the terminal device is located and the TA change rate. Among them, the TA change rate caused by the movement of the satellite base station is related to the geographical location of the terminal device, and the TA change rate of the terminal device closer to the directly below of the satellite base station changes more greatly, while the TA change rate of the terminal device farther from the directly below of the satellite base station is smaller or even tends to be a straight line. Therefore, in this embodiment, the satellite base station may divide the cells according to the change situation of the TA change rate, and broadcast the TA change rate corresponding to each cell within each cell respectively, so that the terminal device determines the TA change rate by receiving the broadcast of the satellite base station.

[0213] For example, Figure 12 is a schematic diagram of dividing cells according to the TA change rate provided by this application Figure 1 , in the example as Figure 12 shown, in order to reduce the compensation error of TA, the satellite base station O has different radii in different cells within its coverage area, and the radius of the cell closest to the directly below of the satellite base station O is the smallest, and its TA change rate is denoted as △TA1'; while the TA change rate of the cell slightly farther from the satellite base station O is denoted as △TA2'; the radius of the outermost cell in the coverage area of the satellite base station O is the largest, and its TA change rate is denoted as △TA3'.

[0214] And, in the example as Figure 12 shown, in order to reduce the signaling overhead of the access network device indicating the TA change rate to the terminal device, in this embodiment, the TA change rate may also be bound to the cell ID / indication parameter in an implicit indication manner by the access network device, so that the terminal device can determine the TA change rate of the cell according to the ID of the cell where it is located without the access network device specifically sending the TA change rate to the terminal device.

[0215] Table 3

[0216] Indicator parameter / Cell ID TA change rate 1 |ΔTA1’| 2 |ΔTA2’| 3 |ΔTA2’| … … k |ΔTAk’|

[0217] For example, as shown in Table 3 above, the terminal device may store the mapping relationship between the TA change rate and the cell ID in a table. Among them, different cell IDs correspond to different TA change rates, and the terminal device may look up the table according to the indication parameter broadcast by the satellite base station or the detected cell ID to obtain the specific TA change rate. Since Figure 12When the satellite base station moves to the left in the figure, the TA change rates on the left are all positive while those on the right are all negative. And the TA change rates stored in Table 3 are only absolute values. Therefore, for TA change rates with opposite signs, the same or different indication parameters can be used. When the indication parameters are the same, the terminal device can judge the positive and negative of the TA change rate according to the estimation of the Doppler frequency shift of the satellite base station, so as to reduce the storage space occupied by Table 3. For example, when the Doppler frequency shift is positive, TA is negative, and when the Doppler frequency shift is negative, TA is positive.

[0218] Optionally, on the basis of dividing cells according to the TA change rate as Figure 12 shown, if the TA error accuracy required in the existing 5G NR is to be achieved, when dividing cells, the cell radius directly below the radar base station needs to be set to 10 km. However, this cell radius is too small for the satellite, and different cell radius designs increase the complexity of design and implementation. Therefore, based on the embodiment as Figure 12 shown, this application also provides a method for dividing different TA change rates in each cell, where Figure 13 is the schematic diagram of dividing cells according to the TA change rate provided by this application Figure 2 , as Figure 13 shown, within the cells divided by the satellite base station, cells with different relative positions correspond to one or more TA change rates. And in the cells containing multiple TA change rates, the TA change rates corresponding to different regions are different. Therefore, the satellite base station can broadcast all the TA change rates in the cell in the cell, and terminal devices at different positions can select the corresponding TA change rate in the cell according to parameters such as the Doppler frequency shift. Among them, the radius of the cell directly below the satellite base station is the smallest, and the TA change rates available to the terminal devices in this cell include: △TA11’, △TA12’, △TA13’, -△TA11’, -△TA12’ and -△TA13’; the cell radius of the cell outside the cell directly below the above base station is slightly larger, and according to different movement directions of the satellite base station, the TA change rates available to the terminal devices in the cell include: △TA14’, △TA15’ and △TA16’, or include: -△TA14’, -△TA15’ and -△TA16’; and the cell radius of the cell at the boundary of the maximum coverage range of the satellite base station is the largest, and according to different movement directions of the satellite base station, the TA change rates available to the terminal devices in the cell include: △TA1k’, or include: -△TA1k’. Therefore, in this embodiment, in addition to enabling the terminal device to perform self-precompensation to reduce the TA error introduced by the delay when the satellite base station indicates to adjust TA, it is also possible to divide the cells corresponding to the satellite base station without restricting the cell radius according to the TA change rate, thereby reducing the complexity of design and implementation.

[0219] In the embodiments provided by the present application, the method provided by the present application is introduced and described from the perspectives of the access network device and the terminal device. To implement each function in the method provided by the embodiments of the present application, the access network device and the terminal device may include a hardware structure and / or a software module, and implement each of the above functions in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module. Whether a certain function among the above functions is executed in the form of a hardware structure, a software module, or a combination of a hardware structure and a software module depends on the specific application and design constraints of the technical solution.

[0220] Figure 14 It is a schematic structural diagram of an embodiment of the terminal device provided by the present application, which is used to execute the method of the terminal device in the above embodiment, as Figure 14 shown, the terminal device provided in this embodiment includes: a transceiver module 1401, a parameter determination module 1402, and a TA determination module 1403. Among them, the transceiver module 1401 is used to obtain TA adjustment parameters from the access network device; among them, the TA adjustment parameter is used to indicate the TA adjustment amount of the terminal device; the parameter determination module 1402 is used to determine the TA scaling factor of the terminal device, the subcarrier spacing parameter of the terminal device, and the first TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameter; among them, the TA scaling factor is used to scale the TA adjustment amount of the terminal device; the TA determination module 1403 is used to determine the second TA according to the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA; the transceiver module 1401 is further used to communicate with the access network device using the second TA.

[0221] The terminal device provided in this embodiment can be used to execute as Figure 7 shown in the method, the method executed by the terminal device, and its implementation manner and principle are the same and will not be elaborated.

[0222] Optionally, the TA determination module 1403 is specifically used to calculate TA2 through the formula TA2 = TA1 + k·(T A -31)·16·64 / 2 μ ; where TA1 is the first TA, T A is the TA adjustment parameter, k is the TA scaling factor, 2 μ is the subcarrier spacing parameter, Δf = 2 μ ·15[kHz], and △f is the subcarrier spacing of the terminal device.

[0223] Optionally, the parameter determination module 1402 is specifically used to determine the TA scaling factor according to the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA.

[0224] Optionally, the parameter determination module 1402 is specifically configured to calculate the TA scaling factor k through the formula 2(v1 + v2) / f TA / c = k·32·16·64·T c / 8; where v1 is the maximum moving speed of the terminal device, v2 is the moving speed of the access network device, f TA is the frequency at which the access network device instructs the terminal device to adjust the TA, c is the speed of light, and T c is the basic time unit.

[0225] Optionally, the parameter determination module 1402 is further configured to determine whether the TA adjustment amount of the terminal device after being processed by the TA scaling factor meets a preset condition; if so, determine the second TA according to the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA.

[0226] Optionally, the parameter determination module 1402 is specifically configured to determine the TA scaling factor according to the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device.

[0227] Optionally, the parameter determination module 1402 is specifically configured to determine the TA scaling factor corresponding to the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device by looking up the first mapping relationship; where the first mapping relationship includes at least one corresponding relationship between the moving speed of the access network device, the height where the access network device is located, the height time advance amount of the access network device, and the TA scaling factor.

[0228] Optionally, the parameter determination module 1402 is specifically configured to determine the TA scaling factor corresponding to the subcarrier spacing of the terminal device, the moving speed of the access network device, the height where the access network device is located, and the height time advance amount of the access network device by looking up the second mapping relationship; where the second mapping relationship includes at least one corresponding relationship between the subcarrier spacing of the terminal device, the moving speed of the access network device, the height where the access network device is located, the height time advance amount of the access network device, and the TA scaling factor.

[0229] Optionally, the parameter determination module 1402 is specifically configured to determine the TA scaling factor according to the format of the random access preamble used by the terminal device during the random access to the access network device.

[0230] Optionally, the TA determination module 1403 is further configured to determine the second TA according to the TA offset parameter, the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA; where the TA offset parameter is used to perform an offset process on the TA adjustment amount of the terminal device.

[0231] Optionally, the transceiver module 1401 is further configured to receive indication information sent by the access network device; the indication information is used to indicate the common delay of the cell where the terminal device is located, and the parameter determination module 1402 is further configured to determine the common delay according to the indication information.

[0232] The terminal device provided in this embodiment can be used to execute the method as Figure 3 shown. For the method executed by the terminal device, its implementation manner and principle are the same and will not be elaborated here.

[0233] Optionally, the transceiver module 1401 is further configured to, when the terminal device first accesses the access network device, obtain the initial TA parameters from the access network device; the TA determination module 1403 is further configured to determine the initial TA according to the common delay, the initial TA parameters, and the subcarrier spacing parameters.

[0234] Optionally, the common delay includes: the height time advance of the access network device and the angular time advance of the cell where the terminal device is located.

[0235] Optionally, the parameter determination module 1402 is further configured to, if the terminal device is in a stationary state, determine the TA change rate of the terminal device; wherein, the TA change rate is used to represent the TA adjustment amount within the cell where the terminal device is located caused by the movement of the access network device.

[0236] The TA determination module 1403 is further configured to determine the fourth TA according to the TA change rate, the third TA, the TA adjustment parameter, and the subcarrier spacing parameters; wherein, the third TA is the TA used by the terminal device when communicating with the access network device before determining the fourth TA; the transceiver module 1401 is further configured to communicate with the access network device using the fourth TA.

[0237] Optionally, the TA determination module 1403 is further configured to calculate the fourth TA through the formula TA4 = TA3 + △N TA + △N' TA ·△t, where △N TA =(T A -31)·16·64 / 2 μ , T A is the TA adjustment parameter sent by the access network device, △N' TA is the TA adjustment amount, △t = t1 - t0, t0 is the time when the terminal device receives the TA adjustment parameter, and t1 is the time when the terminal device is about to send uplink communication data to the access network device.

[0238] Optionally, the parameter determination module 1402 is further configured to determine the TA change rate of the terminal device according to the third mapping relationship; wherein, the third mapping relationship includes: the correspondence between the Doppler frequency shift of at least one access network device and the TA change rate of the terminal device.

[0239] The terminal device provided in this embodiment can be used to execute the method described in the foregoing embodiment. The method executed by the terminal device has the same implementation manner and principle, which will not be elaborated herein.

[0240] Figure 15 The following is a schematic structural diagram of an access network device provided in this application, which is used to execute the method of the access network device in the above embodiment. As Figure 15 shown, the access network device provided in this embodiment includes: a transceiver module 1501 and a determination module 1502. Among them, the determination module 1502 is used to determine the TA adjustment parameter of the terminal device; wherein, the TA adjustment parameter is used to indicate the TA adjustment amount of the terminal device; the transceiver module 1501 is used to send the TA adjustment parameter to the terminal device, so that the terminal device determines the second TA according to the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA; wherein, the TA scaling factor is used to scale the TA adjustment amount of the terminal device, and the first TA is the TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameter.

[0241] The access network device provided in this embodiment can be used to execute the method as Figure 7 shown. The method executed by the access network device has the same implementation manner and principle, which will not be elaborated herein.

[0242] Optionally, the transceiver module 1501 is further used to send indication information to the terminal device, and the indication information is used to indicate the common delay of the cell where the terminal device is located. Optionally, the common delay includes: the height time advance of the access network device, and the angular time advance of the cell where the terminal device is located.

[0243] Optionally, the transceiver module 1501 is specifically used to broadcast the common delay in the cell where the terminal device is located; or, broadcast the height time advance in the coverage area of the access network device, and broadcast the angular time advance in the cell where the terminal device is located.

[0244] The access network device provided in this embodiment can be used to execute the method described in the foregoing embodiment. The method executed by the access network device has the same implementation manner and principle, which will not be elaborated herein.

[0245] The division of modules in the above embodiments of this application is illustrative. It is only a logical function division. In actual implementation, there may be other division methods. In addition, in each embodiment of this application, each functional module can be integrated in a processor, or can exist separately physically, or two or more modules can be integrated in one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0246] Figure 16The structural schematic diagram of an embodiment of the communication device provided by this application is as follows Figure 16 The shown communication device can be used as the terminal device in any of the foregoing embodiments of this application or the access network device in any of the embodiments, and implement the TA determination method of the foregoing terminal device. The communication device 1000 includes: a communication interface 1010, a processor 1020, and a memory 1030. Among them, the communication interface 1010 can be a transceiver, a circuit, a bus, or other forms of interfaces, and is used to communicate with other devices through a transmission medium. The communication interface 1010, the processor 1020, and the memory 1030 are coupled. The coupling in the embodiments of this application is an indirect coupling or communication connection between devices, units, or modules, and can be electrical, mechanical, or other forms, and is used for information interaction between devices, units, or modules.

[0247] In the embodiments of this application, the specific connection medium between the foregoing communication interface 1010, processor 1020, and memory 1030 is not limited. In the embodiments of this application Figure 16 it is shown that the communication interface 1010, the memory 1030, and the processor 1020 are connected through a bus 1040. The bus is represented by a thick line Figure 16 in it. The connection manners between other components are only for illustrative purposes and are not to be construed as limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation Figure 16 in it, only one thick line is used to represent, but it does not mean that there is only one bus or one type of bus.

[0248] In a possible implementation manner, if the shown communication device is a terminal device Figure 16 then the terminal device can be used to implement the methods executed by the terminal device in the foregoing embodiments of this application.

[0249] Exemplarily, the communication interface 1010 is used to obtain TA adjustment parameters from an access network device and send the TA adjustment parameters to the processor; wherein, the TA adjustment parameters are used to indicate the TA adjustment amount of the terminal device; instructions are stored in the memory 1030, and when the processor 1020 calls and executes the instructions, the processor 1020, after receiving the TA adjustment parameters, determines the TA scaling factor of the terminal device, the subcarrier spacing parameter of the terminal device, and the first TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameters; the processor 1020 further determines a second TA according to the TA adjustment parameters, the TA scaling factor, the subcarrier spacing parameter, and the first TA; the communication port 1010 also communicates with the access network device using the second TA. Alternatively, exemplarily, the communication interface 1010 is further used to receive indication information sent by the access network device and send the indication information to the processor; the indication information is used to indicate the common delay of the cell where the terminal device is located; the processor 1020 is further used to determine the common delay according to the indication information when receiving the indication information; the communication interface 1010 is further used to, when the terminal device first accesses the access network device, obtain TA initial parameters from the access network device and send the TA initial parameters to the processor; the processor 1020 is further used to, when receiving the TA initial parameters, determine the initial TA according to the common delay, the TA initial parameters, and the subcarrier spacing parameter.

[0250] For the specific implementation of the above example, refer to the detailed description in the corresponding example of the foregoing method, which will not be elaborated here.

[0251] In another possible implementation, if the Figure 16 communication device shown is an access network device, the access network device can be used to implement the methods performed by the access network device in the foregoing embodiments of the present application.

[0252] Exemplarily, when the processor 1020 calls and executes the instructions stored in the memory 1030, the processor 1020 determines the TA adjustment parameters of the terminal device and sends the TA adjustment parameters to the communication interface 1010; when the communication interface 1010 receives the TA adjustment parameters, it sends the TA adjustment parameters to the terminal device. Alternatively, exemplarily, the communication interface 1010 is further used to send indication information to the terminal device, and the indication information is used to indicate the common delay of the cell where the terminal device is located.

[0253] For the specific implementation of the above example, refer to the detailed description in the corresponding example of the foregoing method, which will not be elaborated here.

[0254] In an embodiment of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or implemented by a combination of hardware and software modules in the processor.

[0255] In an embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory, such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory in the embodiments of the present application may also be a circuit or any other device capable of implementing a storage function, for storing program instructions and / or data.

[0256] In the methods provided by the embodiments of the present application, they can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, they can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a digital video disc (DVD)), or a semiconductor medium (such as an SSD), etc.

[0257] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to cover these changes and modifications.

Claims

1. A method for determining TA of a terminal device, characterized in that, including: obtaining TA adjustment parameters from an access network device; wherein the TA adjustment parameters are used to indicate the TA adjustment amount of the terminal device; determining a TA scaling factor, a TA change rate, a subcarrier spacing parameter of the terminal device, and a first TA used when the terminal device communicates with the access network device before receiving the TA adjustment parameters; wherein the TA scaling factor is used to scale the TA adjustment amount of the terminal device; the TA change rate is used to represent the TA adjustment amount in the cell where the terminal device is located caused by the movement of the access network device; determining a second TA according to the TA adjustment parameters, the TA scaling factor, the subcarrier spacing parameter, and the first TA; determining a fourth TA according to the TA change rate, a third TA, the TA adjustment parameters, and the subcarrier spacing parameter; wherein the third TA is the TA used when the terminal device communicates with the access network device before determining the fourth TA; the determining the TA scaling factor includes: determining the TA scaling factor according to the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA.

2. The method according to claim 1, wherein the determining the fourth TA according to the TA change rate, the third TA, the TA adjustment parameters, and the subcarrier spacing parameter includes: Calculate the fourth TA through the formula TA4 = TA3 + △N TA + △N' TA ·△t, where △N TA =(T A - 31)·16·64 / 2 μ , T A is the TA adjustment parameter sent by the access network device, △N' TA is the TA adjustment amount, △t = t1 - t0, t0 is the time when the terminal device receives the TA adjustment parameter, and t1 is the time when the terminal device will send uplink communication data to the access network device.

3. The method according to claim 1 or 2, characterized in that, the determining the TA change rate of the terminal device includes: determining the TA change rate of the terminal device according to a third mapping relationship; wherein the third mapping relationship includes: the correspondence between the Doppler frequency shift of at least one access network device and the TA change rate of the terminal device.

4. The method according to claim 1, wherein the determining the second TA according to the TA adjustment parameters, the TA scaling factor, the subcarrier spacing parameter, and the first TA includes: Calculate TA2 through the formula TA2 = TA1 + k·(T A - 31)·16·64 / 2 μ ; Among them, TA1 is the first TA, T A is the TA adjustment parameter, k is the TA scaling factor, 2 μ is the subcarrier spacing parameter, Δf = 2 μ ·15 [kHz], and △f is the subcarrier spacing of the terminal device.

5. The method according to claim 1, characterized in that, the determining the TA scaling factor according to the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA includes: Through the formula 2(v1 + v2) / f TA / c = k·32·16·64·T c Calculate the TA scaling factor k by dividing by 8; Wherein, v1 is the maximum moving speed of the terminal device, v2 is the moving speed of the access network device, f TA is the frequency at which the access network device instructs the terminal device to adjust the TA, c is the speed of light, and T c is the basic time unit.

6. The method according to any one of claims 1-2, 4-5, characterized in that before obtaining the TA adjustment parameters from the access network device, further including: receiving indication information sent by the access network device; the indication information is used to indicate the common delay of the cell where the terminal device is located; determining the common delay according to the indication information.

7. The method according to claim 6, wherein before obtaining the TA adjustment parameters from the access network device, further including: when the terminal device first accesses the access network device, obtaining TA initial parameters from the access network device; determining an initial TA according to the common delay, the TA initial parameters, and the subcarrier spacing parameter.

8. The method according to claim 7, wherein the common delay includes: the height time advance of the access network device, and the angular time advance of the cell where the terminal device is located.

9. A method for determining TA of a terminal device, characterized in that, including: determining TA adjustment parameters of a terminal device; wherein the TA adjustment parameters are used to indicate the TA adjustment amount of the terminal device; Send the TA adjustment parameter to the terminal device, so that the terminal device determines a second TA according to the TA adjustment parameter, the TA scaling factor, the subcarrier spacing parameter, and the first TA; wherein, the TA scaling factor is used to scale the TA adjustment amount of the terminal device, and the first TA is the TA used by the terminal device when communicating with the access network device before the terminal device receives the TA adjustment parameter; the TA scaling factor is determined according to the maximum moving speed of the terminal device, the moving speed of the access network device, and the frequency at which the access network device instructs the terminal device to adjust the TA.

10. The method according to claim 9, wherein Further comprising: Send indication information to the terminal device, where the indication information is used to indicate the common delay of the cell where the terminal device is located.

11. The method according to claim 10, wherein The common delay includes: the height time advance of the access network device and the angular time advance of the cell where the terminal device is located.

12. The method according to claim 11, wherein Sending the indication information to the terminal device includes: Broadcasting the common delay in the cell where the terminal device is located; Or, Broadcasting the height time advance in the coverage area of the access network device and broadcasting the angular time advance in the cell where the terminal device is located.

13. A TA determination device for a terminal device, characterized in that Comprising: A transceiver module, a parameter determination module, and a TA determination module, wherein the transceiver module is used to perform the transceiver operations in the method according to any one of claims 1-8 or 9-12; the parameter determination module is used to perform the parameter determination operations in the method according to any one of claims 1-8 or 9-12; the TA determination module is used to perform the TA determination operations in the method according to any one of claims 1-8 or 9-12.

14. A communication device, characterized in that, Comprising: A processor and a memory; instructions are stored in the memory, and when the processor calls and executes the instructions, the device performs the method according to any one of claims 1-8 or 9-12.

15. A computer-readable storage medium, characterized in that, Instructions are stored, and when they run on a computer, the computer performs the method according to any one of claims 1-8 or 9-12.

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