CN115915188A

CN115915188A - Data transmission method and related device

Info

Publication number: CN115915188A
Application number: CN202110945432.XA
Authority: CN
Inventors: 雷珍珠
Original assignee: Spreadtrum Semiconductor Nanjing Co Ltd
Current assignee: Spreadtrum Semiconductor Nanjing Co Ltd
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2023-04-04
Also published as: WO2023020367A1

Abstract

The application discloses a data transmission method and a related device, and relates to the technical field of wireless communication. The method comprises the following steps: receiving a first timing advance value sent by the first network equipment or the second network equipment, determining a target timing advance value according to the first timing advance value, and performing uplink data transmission with the first network equipment according to the target timing advance value. The first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, a coverage area of the second cell is overlapped with a coverage area of the first cell, and the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell. The method can ensure that the accuracy of the uplink sending time is higher, avoid uplink desynchronization of the terminal equipment in a Non-GNSS scene, and greatly improve the reliability of uplink transmission of the terminal equipment.

Description

Data transmission method and related device

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a data transmission method and a related apparatus.

Background

In the current non-terrestrial network (NTN), it is assumed that a terminal device has a Global Navigation Satellite System (GNSS) positioning capability, that is, the terminal device can calculate round-trip transmission time delay (RTT) between the terminal device and a service satellite according to ephemeris information and self position information obtained by using the GNSS, and further determine a Timing Advance (TA) value (total TA pre-compensation value of the terminal device) sent by the terminal device in an uplink direction, so as to complete uplink transmission of the terminal device.

However, in a Non-GNSS scenario, the terminal device does not have GNSS capability, cannot acquire its own position information, cannot calculate the RTT between the terminal device and the serving satellite, and further cannot determine an accurate total TA pre-compensation value for uplink data transmission, which causes uplink desynchronization and seriously affects the reliability of uplink transmission of the terminal device.

Disclosure of Invention

The embodiment of the application provides a data transmission method and a related device, wherein a terminal device can determine a target TA value used for representing RTT between the terminal device and a service satellite by receiving a first TA value sent by a first network device or a second network device, so that a total TA precompensation value of uplink data transmission between the terminal device and the first network device is determined, uplink desynchronization of the terminal device in a Non-GNSS scene is avoided, and the reliability of uplink transmission of the terminal device is greatly improved.

In a first aspect, an embodiment of the present application provides a data transmission method, which is applied to a terminal device, and the method includes:

receiving a first TA value sent by first network equipment or second network equipment; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, a coverage area of the second cell overlaps with a coverage area of the first cell, and the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

determining a target TA value according to the first TA value;

and performing uplink data transmission with the first network equipment according to the target TA value.

The first aspect provides a data transmission method applied to a terminal device side, where the terminal device first receives a first TA value sent by a first network device or a second network device, then determines a target TA value according to the first TA value, and finally performs uplink data transmission with the first network device according to the target TA value. The first network device is a network device corresponding to a first cell, such as a first cell base station, and the second network device is a network device corresponding to a second cell, such as a second cell base station, and a coverage area of the first cell overlaps a coverage area of the second cell, specifically, a coverage area of the first cell partially overlaps a coverage area of the second cell, or a coverage area of the first cell completely includes a coverage area of the second cell, and the terminal device may be located in an overlapping portion of the coverage areas of the first cell and the second cell. The received first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell. According to the embodiment of the application, the target TA value used for representing the RTT between the terminal equipment and the service satellite can be determined based on the received first TA value sent by the first network equipment or the second network equipment, so that the total TA precompensation value of uplink data transmission between the terminal equipment and the first network equipment is determined, the accuracy of uplink sending time is higher, uplink desynchronization of the terminal equipment under a Non-GNSS scene is avoided, and the reliability of uplink transmission of the terminal equipment is greatly improved.

In a possible implementation manner, the first TA value is obtained according to location information of a coverage area of the second cell and location information of a satellite corresponding to the first cell.

In this possible implementation manner, the first TA value received by the terminal device is obtained according to the location information of the coverage area of the second cell and the location information of the satellite corresponding to the first cell. Specifically, the first TA value may be determined by the first network device according to the location information of the coverage area of the second cell and the location information of the satellite corresponding to the first cell, and is sent to the terminal device; the first TA value may also be determined by the second network device according to the location information of the coverage area of the second cell and the location information of the satellite corresponding to the first cell, and sent to the terminal device. According to the embodiment of the application, the received first TA value has higher precision, so that the precision of the target TA value determined based on the first TA value is higher, the accuracy of the uplink sending time of the terminal equipment can be improved, the uplink desynchronizing is avoided, and the reliability of the uplink transmission of the terminal equipment is improved.

In a possible implementation, the receiving the first TA value sent by the second network device includes:

under the condition that the radio resource control connection with the second cell is not established, receiving a broadcast message sent by the second network equipment, and acquiring the first TA value; or,

and under the condition of establishing radio resource control connection with the second cell, receiving a broadcast message or radio resource control signaling or media access layer control signaling sent by the second network equipment, and acquiring the first TA value.

The possible implementation manner provides a possible specific implementation manner for receiving the first TA value, specifically, when the terminal device does not establish a radio resource control connection with the second cell, that is, when the terminal device is in an idle state or an inactive state with respect to the second cell, the terminal device obtains the first TA value by receiving a broadcast message sent by the second network device; or, when the terminal device establishes a radio resource control connection with the second cell, that is, the terminal device is in a connected state with respect to the second cell, the terminal device obtains the first TA value by receiving a broadcast message or a radio resource control signaling or a media access layer control signaling sent by the second network device.

In a possible implementation, the determining a target TA value according to the first TA value includes:

taking the first TA value as the target TA value;

or, taking the sum of the second TA value and/or the third TA value and the first TA value as the target TA value; the second TA value and the third TA value are obtained from a broadcast message corresponding to the first cell, where the second TA value is a common TA value broadcast by the first cell, and the third TA value includes a timing adjustment value and/or a timing offset value issued by the first cell.

The possible implementation manner provides a possible specific implementation manner for determining the target TA value according to the first TA value, specifically, the terminal device determines the received first TA value as the target TA value, and the target TA value is used to indicate an opportunity to send uplink data to the first network device. Or, the terminal device determines the second TA value and/or the third TA value and the sum of the received first TA values as a target TA value, where the target TA value is used to indicate an opportunity to transmit uplink data to the first network device, and specifically, the terminal device may use the sum of the second TA value and the first TA value as the target TA value, may also use the sum of the third TA value and the first TA value as the target TA value, and may also use the sum of the first TA value, the second TA value, and the third TA value as the target TA value. Optionally, the second TA value and the third TA value are obtained from a broadcast message corresponding to the first cell, where the second TA value is a public TA value broadcast by the first cell, and the third TA value includes a timing adjustment value and/or a timing offset value issued by the first cell. According to the embodiment of the application, the target TA value determined based on the received first TA value has higher precision, so that the total TA precompensation value precision of uplink data transmission between the determined terminal equipment and the first network equipment is higher, the accuracy of uplink sending time is higher, the uplink desynchronization of the terminal equipment under the Non-GNSS scene is avoided, and the reliability of the uplink transmission of the terminal equipment is greatly improved.

In a possible implementation manner, the performing, according to the target TA value, uplink data transmission with the first network device includes:

the target TA value is advanced, and uplink data are sent to the first network equipment; the uplink data comprises physical random access channel data, or physical uplink shared channel data, or physical uplink control channel data.

In a possible implementation, the reference point is a point within the coverage area of the second cell that is closest to the satellite corresponding to the first cell, or is any fixed point within the coverage area of the second cell with respect to the position of the satellite corresponding to the second cell.

In one possible embodiment, the satellite corresponding to the first cell is in the same satellite orbit as the satellite corresponding to the second cell, or in a different satellite orbit.

In one possible embodiment, the method further comprises:

under the condition of initiating random access to the first cell, determining the initial position of a random access response window according to the first TA value;

and starting monitoring the random access response window at the initial position of the random access response window.

The possible implementation manner provides a possible specific implementation manner for monitoring the random access response window, specifically, when the terminal device initiates random access to the first cell, the starting position of the random access response window is determined according to the first TA value, and then monitoring of the random access response window is started at the starting position of the random access response window. By the embodiment of the application, the starting position of the random access response window can be determined more accurately, so that monitoring on the random access response window is started more accurately.

In a possible implementation, the determining a starting position of a random access response window according to the first TA value includes:

taking the sum of the second TA value or the first TA value and the first TA value as a second time delay value; the second TA value and the first delay value are obtained from a broadcast message corresponding to the first cell, the second TA value is a common TA value broadcast by the first cell, and the first delay value is an effective delay value of a mac unit of the first cell;

and determining the starting position of the random access response window according to the ending position of the first message Msg1 sent to the first cell and the second time delay value.

In the embodiment of the present application, a possible specific implementation manner of determining the starting position of the random access response window according to the first TA value is provided, specifically, the second TA value or the first delay value and the sum of the first TA values are determined as the second delay value, specifically, the sum of the second TA value and the first TA value may be used as the second delay value, the sum of the first delay value and the first TA value may be used as the second delay value, and the sum of the second TA value, the first delay value and the first TA value may be used as the second delay value; and then, determining the starting position of the random access response window according to the ending position of the first message Msg1 sent to the first cell and the determined second time delay value, specifically, determining the position of the second time delay value after the ending position of the first message Msg1 sent to the first cell as the starting position of the random access response window. By the embodiment of the application, the accuracy of the determined initial position of the random access response window is higher, and the monitoring of the random access response window can be started more accurately.

In a second aspect, an embodiment of the present application provides a data transmission method, which is applied to a first network device, and the method includes:

receiving the position information of the coverage area of the second cell sent by the second network equipment; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, and a coverage area of the second cell is overlapped with a coverage area of the first cell;

determining a first TA value according to the position information of the coverage area of the second cell and the position information of the satellite corresponding to the first cell; the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

and sending the first TA value to the terminal equipment.

A second aspect provides a data transmission method applied to a first network device side, where the first network device first receives location information of a coverage area of a second cell sent by a second network device, then determines a first TA value according to the location information of the coverage area of the second cell and location information of a satellite corresponding to the first cell, and finally sends the determined first TA value to a terminal device. The first network device is a network device corresponding to a first cell, such as a first cell base station, and the like, the second network device is a network device corresponding to a second cell, such as a second cell base station, and the like, the terminal device is a device for establishing dual connectivity between the first cell and the second cell, a coverage area of the first cell overlaps a coverage area of the second cell, specifically, the first cell and the second cell intersect but do not overlap, or the second cell is included in the first cell, and the determined first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell. According to the embodiment of the application, the target TA value used for representing RTT between the terminal equipment and the service satellite can be determined based on the position information of the coverage area of the second cell and the first TA value determined by the position information of the satellite corresponding to the first cell, so that the total TA pre-compensation value of uplink data transmission between the terminal equipment and the first network equipment is determined, the accuracy of uplink sending time is high, uplink desynchronization of the terminal equipment in a Non-GNSS scene is avoided, and the reliability of uplink transmission of the terminal equipment is greatly improved.

In a possible implementation, the sending the first TA value to the terminal device includes:

and sending a radio resource control signaling or a media access layer control signaling to the terminal equipment, wherein the radio resource control signaling or the media access layer control signaling is used for indicating the first TA value to the terminal equipment.

The possible implementation manner provides a possible specific implementation manner for sending the first TA value to the terminal device, specifically, sending a radio resource control signaling or a medium access stratum control signaling to the terminal device, where the radio resource control signaling or the medium access stratum control signaling is used to indicate the first TA value determined by the first network device to the terminal device.

In a third aspect, an embodiment of the present application provides a data transmission method, which is applied to a second network device, and the method includes:

determining a first TA value according to the position information of the coverage area of the second cell and the position information of the satellite corresponding to the first cell, and sending the first TA value to the terminal equipment; the second network device is a network device corresponding to the second cell, the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell, and the coverage area of the second cell overlaps with the coverage area of the first cell;

or, sending the location information of the coverage area of the second cell to the first network device; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, the location information of the coverage area of the second cell is used for determining a first TA value, the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell, and the coverage area of the second cell overlaps with the coverage area of the first cell.

A third aspect provides a data transmission method applied to a second network device side, where the second network device sends a first TA value determined by the second network device to a terminal device, or the second network device sends location information of a coverage area of a second cell to a first network device. Specifically, the second network device determines a first TA value according to the location information of the coverage area of the second cell and the location information of the satellite corresponding to the first cell, and then sends the first TA value to the terminal device; or, the second network device directly sends the location information of the coverage area of the second cell to the first network device, the first network device determines the first TA value according to the received location information of the coverage area of the second cell and the location information of the satellite corresponding to the first cell, and then the first network device sends the determined first TA value to the terminal device. The first network device is a network device corresponding to a first cell, such as a first cell base station, and the like, the second network device is a network device corresponding to a second cell, such as a second cell base station, and the like, the terminal device is a device for establishing dual connectivity between the first cell and the second cell, a coverage area of the first cell overlaps a coverage area of the second cell, specifically, the first cell and the second cell intersect but do not overlap, or the second cell is included in the first cell, and the determined first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell. According to the embodiment of the application, the target TA value used for representing RTT between the terminal equipment and the service satellite can be determined based on the position information of the coverage area of the second cell and the first TA value determined by the position information of the satellite corresponding to the first cell, so that the total TA pre-compensation value of uplink data transmission between the terminal equipment and the first network equipment is determined, the accuracy of uplink sending time is high, uplink desynchronization of the terminal equipment in a Non-GNSS scene is avoided, and the reliability of uplink transmission of the terminal equipment is greatly improved.

under the condition that the wireless resource control connection is not established with the terminal equipment, sending a broadcast message; the broadcast message is used for indicating the first TA value; or,

under the condition of establishing radio resource control connection with the terminal equipment, sending a broadcast message, or sending a radio resource control signaling to the terminal equipment, or sending a media access layer control signaling to the terminal equipment; the broadcast message or the radio resource control signaling or the medium access layer control signaling is used to indicate the first TA value.

The possible implementation manner provides a possible specific implementation manner for sending the first TA value to the terminal device, specifically, when a radio resource control connection is not established with the terminal device, that is, for a case that the second cell is in an idle state or an inactive state, the second network device indicates the first TA value determined by the second network device by sending a broadcast message; or, when the radio resource control connection is established with the terminal device, that is, in a case of being in a connected state with respect to the second cell, the second network device indicates the first TA value determined by the second network device by sending a broadcast message or a radio resource control signaling or a media access layer control signaling.

In a possible implementation, the reference point is a point in the coverage area of the second cell that is closest to the satellite corresponding to the first cell, or is any fixed point in the coverage area of the second cell relative to the position of the satellite corresponding to the second cell.

In a fourth aspect, an embodiment of the present application provides a data transmission apparatus, where the apparatus includes:

a receiving unit, configured to receive a first TA value sent by a first network device or a second network device; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, a coverage area of the second cell overlaps with a coverage area of the first cell, and the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

a determining unit, configured to determine a target TA value according to the first TA value;

and the transmission unit is used for carrying out uplink data transmission with the first network equipment according to the target TA value.

In a possible implementation manner, the first TA value is obtained according to the location information of the coverage area of the second cell and the location information of the satellite corresponding to the first cell.

In a possible implementation manner, the receiving unit is specifically further configured to receive a broadcast message sent by the second network device to acquire the first TA value, when the radio resource control connection is not established with the second cell; or,

the receiving unit is further specifically configured to receive a broadcast message or a radio resource control signaling or a media access layer control signaling sent by the second network device under the condition that the radio resource control connection is established with the second cell, and acquire the first TA value.

In a possible implementation, the determining unit is specifically configured to use the first TA value as the target TA value;

or, the determining unit is specifically configured to use a sum of a second TA value and/or a third TA value and the first TA value as the target TA value; the second TA value and the third TA value are obtained from a broadcast message corresponding to the first cell, the second TA value is a public TA value broadcast by the first cell, and the third TA value includes a timing adjustment value and/or a timing offset value issued by the first cell.

In a possible implementation manner, the transmission unit is specifically configured to advance the target TA value and send uplink data to the first network device; the uplink data comprises physical random access channel data, or physical uplink shared channel data, or physical uplink control channel data.

In one possible embodiment, the apparatus further comprises:

the determining unit is further configured to determine, according to the first TA value, an initial position of a random access response window when initiating random access to the first cell;

and the monitoring unit is used for starting monitoring the random access response window at the initial position of the random access response window.

In a possible implementation manner, the determining unit is specifically configured to use a sum of a second TA value or a first time delay value and the first TA value as the second time delay value; the second TA value and the first delay value are obtained from a broadcast message corresponding to the first cell, where the second TA value is a public TA value broadcast by the first cell, and the first delay value is an effective delay value of a mac unit of the first cell;

the determining unit is further specifically configured to determine a starting position of the random access response window according to an ending position of sending the first message Msg1 to the first cell and the second delay value.

With regard to the technical effects brought about by the fourth aspect or various possible embodiments, reference may be made to the introduction of the technical effects corresponding to the first aspect or the respective embodiments.

In a fifth aspect, an embodiment of the present application provides a data transmission apparatus, where the apparatus includes:

a receiving unit, configured to receive location information of a coverage area of a second cell sent by a second network device; the data transmission device is a device corresponding to a first cell, the second network device is a network device corresponding to a second cell, and the coverage area of the second cell is overlapped with the coverage area of the first cell;

a determining unit, configured to determine a first TA value according to location information of a coverage area of the second cell and location information of a satellite corresponding to the first cell; the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

and the sending unit is used for sending the first TA value to the terminal equipment.

In a possible implementation manner, the sending unit is specifically configured to send radio resource control signaling or media access stratum control signaling to the terminal device, where the radio resource control signaling or the media access stratum control signaling is used to indicate the first TA value to the terminal device.

With regard to the technical effects brought about by the fifth aspect or various possible embodiments, reference may be made to the introduction of the technical effects corresponding to the second aspect or the respective embodiments.

In a sixth aspect, an embodiment of the present application provides a data transmission apparatus, including:

a determining unit, configured to determine a first TA value according to location information of a coverage area of a second cell and location information of a satellite corresponding to a first cell; a sending unit, configured to send the first TA value to a terminal device; the data transmission device is a device corresponding to the second cell, the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell, and the coverage area of the second cell overlaps with the coverage area of the first cell;

or, the sending unit is configured to send location information of a coverage area of the second cell to the first network device; the first network device is a network device corresponding to a first cell, the data transmission device is a device corresponding to a second cell, the location information of the coverage area of the second cell is used for determining a first TA value, the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell, and the coverage area of the second cell overlaps with the coverage area of the first cell.

In a possible implementation manner, the sending unit is specifically configured to send a broadcast message without establishing a radio resource control connection with the terminal device; the broadcast message is used for indicating the first TA value; or,

the sending unit is specifically further configured to send a broadcast message or send a radio resource control signaling to the terminal device or send a media access layer control signaling to the terminal device under the condition that a radio resource control connection is established with the terminal device; the broadcast message or the radio resource control signaling or the medium access layer control signaling is used to indicate the first TA value.

With regard to the technical effects brought about by the sixth aspect or various possible embodiments, reference may be made to the introduction of the technical effects corresponding to the third aspect or the respective embodiments.

In a seventh aspect, an embodiment of the present application provides a communication apparatus, which includes a processor and a memory; the memory is used for storing computer execution instructions; the processor is configured to execute computer-executable instructions stored by the memory to cause the communication apparatus to perform the method according to the first aspect and any of the possible embodiments, or to cause the communication apparatus to perform the method according to the second aspect and any of the possible embodiments, or to cause the communication apparatus to perform the method according to the third aspect and any of the possible embodiments. Optionally, the communication device further includes a transceiver, and the transceiver is configured to receive a signal or transmit a signal.

In an eighth aspect, an embodiment of the present application provides a communication apparatus, which includes a logic circuit and an interface; the logic circuit is coupled with the interface; the interface is configured to input and/or output code instructions, and the logic circuit is configured to execute the code instructions to cause the communication apparatus to perform the method according to the first aspect and any one of the possible embodiments, or to cause the communication apparatus to perform the method according to the second aspect and any one of the possible embodiments, or to cause the communication apparatus to perform the method according to the third aspect and any one of the possible embodiments.

In a ninth aspect, embodiments of the present application provide a computer-readable storage medium for storing instructions or a computer program; the instructions or the computer program, when executed, cause the method of the first aspect and any one of the possible embodiments to be carried out, or cause the method of the second aspect and any one of the possible embodiments to be carried out, or cause the method of the third aspect and any one of the possible embodiments to be carried out.

In a tenth aspect, embodiments of the present application provide a computer program product, which includes instructions or a computer program; the instructions or the computer program, when executed, cause the method of the first aspect and any one of the possible embodiments to be carried out, or cause the method of the second aspect and any one of the possible embodiments to be carried out, or cause the method of the third aspect and any one of the possible embodiments to be carried out.

In an eleventh aspect, embodiments of the present application provide a chip, which includes a processor, and the processor is configured to execute instructions, and when the processor executes the instructions, cause the chip to perform the method according to the first aspect and any possible implementation, or cause the chip to perform the method according to the second aspect and any possible implementation, or cause the chip to perform the method according to the third aspect and any possible implementation. Optionally, the chip further includes a communication interface, and the communication interface is used for receiving signals or sending signals.

In a twelfth aspect, an embodiment of the present application provides a system, including at least one of: the data transmission device of the fourth aspect, the data transmission device of the fifth aspect, the data transmission device of the sixth aspect, the communication device of the seventh aspect, the communication device of the eighth aspect, and the chip of the eleventh aspect.

Furthermore, in the course of executing the method according to the above aspects and any possible embodiment, the process of sending information and/or receiving information, etc. in the above method may be understood as a process of outputting information by a processor and/or a process of receiving input information by a processor. In outputting information, the processor may output the information to a transceiver (or a communication interface, or a transmission module) for transmission by the transceiver. The information may also need to undergo additional processing after being output by the processor before reaching the transceiver. Similarly, when the processor receives input information, the transceiver (or the communication interface, or the transmission module) receives the information and inputs it to the processor. Further, after the transceiver receives the information, the information may need to be further processed before being input to the processor.

Based on the above principle, the sending information mentioned in the foregoing method may be understood as processor output information, for example. As another example, receiving information may be understood as information that the processor receives input.

Alternatively, the operations related to the processor, such as transmitting, sending and receiving, may be more generally understood as operations related to the processor, such as outputting and receiving, inputting, etc., if not specifically stated or if not inconsistent with the actual functioning or inherent logic thereof in the related description.

Optionally, in the process of executing the method according to the above aspects and any possible embodiment, the processor may be a processor dedicated to execute the methods, or may be a processor that executes computer instructions in a memory to execute the methods, for example, a general-purpose processor. The Memory may be a non-transitory (non-transitory) Memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor or may be separately disposed on different chips.

In a possible embodiment, the at least one memory is located outside the device.

In yet another possible embodiment, the at least one memory is located within the device.

In yet another possible implementation, a portion of the at least one memory is located within the apparatus, and another portion of the memory is located outside the apparatus.

In this application, the processor and the memory may also be integrated in one device, i.e. the processor and the memory may also be integrated together.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of a scenario of an NTN according to an embodiment of the present application;

fig. 2a is a schematic view of a scenario of cell dual connectivity according to an embodiment of the present disclosure;

fig. 2b is a schematic view of a scenario for determining a fixed TA value according to an embodiment of the present disclosure;

fig. 3 is an interaction diagram of random access according to an embodiment of the present application;

fig. 4 is a schematic flowchart of a data transmission method according to an embodiment of the present application;

fig. 5 is a schematic view of a scenario for determining a TA value according to an embodiment of the present disclosure;

fig. 6 is a schematic flowchart of another data transmission method according to an embodiment of the present application;

fig. 7a is a schematic flowchart of another data transmission method according to an embodiment of the present application;

fig. 7b is a schematic view of another scenario for determining a TA value according to the embodiment of the present application;

fig. 8 is a schematic structural diagram of a data transmission device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present application;

fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application clearer, embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

The terms "first" and "second," and the like in the description, claims, and drawings of the present application are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. Such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more, "at least two" means two or three and three or more, "and/or" for describing an association relationship of associated objects, meaning that three relationships may exist, for example, "a and/or B" may mean: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

In order to describe the scheme of the present application more clearly, some knowledge related to NTN data transmission is introduced first below.

With the development of information technology, modern communication systems put forward more urgent requirements on high efficiency, maneuverability, diversity and the like of communication, and at present, satellites play an irreplaceable role in some important application scenes such as the fields of space communication, aviation communication, maritime communication, military communication and the like. The satellite communication has the characteristics of long communication distance, large coverage area, flexible networking and the like, and can provide communication service for not only fixed terminals but also various mobile terminals. Since The conventional terrestrial network cannot provide seamless coverage for The terminal device, especially in The sea, desert, air, etc. where The base station cannot be deployed, NTN is introduced into The fifth Generation (5G) mobile communication system, which provides seamless coverage for The terminal device by deploying The base station or a part of The base station function on a high-altitude platform or a satellite. And the high-altitude platform or the satellite is less affected by natural disasters, so that the reliability of the 5G system can be improved. In the NTN based on satellite deployment, a satellite covers the ground through different beams to form a satellite cell, and a certain terminal device can be covered by multiple satellite cells at the same time.

The technical scheme provided by the embodiment of the application can be applied to various communication systems, such as a satellite communication system and a system for fusing satellite communication and a cellular network. The cellular network system may include, but is not limited to: a 5G System, a global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long term evolution (Long term evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD) System, an Advanced Long term evolution (Advanced Long term evolution, LTE-a) System, a New air interface (New Radio, NR) System, an evolution System of the NR System, LTE (LTE-U) System on an unlicensed Frequency band, NR (NR-based to unlicensed spectrum) System on an unlicensed Frequency band, universal Mobile Telecommunications System (UMTS), worldwide Interoperability for Microwave Access (WiMAX) communication System, wireless Local Area Network (WLAN), wireless Fidelity (WiFi), a next-generation communication System, or other communication systems. Generally, a conventional communication system supports a limited number of connections and is easy to implement, however, with the development of communication technology, a mobile communication system will support not only conventional communication but also, for example: device to Device (D2D) Communication, machine to Machine (M2M) Communication, machine Type Communication (MTC), vehicle to Vehicle (V2V) Communication, and other Communication systems evolved in the future, and the embodiments of the present application may also be applied to these Communication systems. The satellite communication system may include various non-terrestrial network systems, such as a network of wireless frequency transmissions from a satellite or unmanned aerial vehicle (UAS) platform, and the like, which are not further illustrated herein.

For example, an NTN system is taken as an example below, and a specific application scenario of the present solution is provided, where the NTN system may be a satellite communication system or other non-terrestrial network system, and the data transmission method in the present solution may be applied in the satellite communication category.

Referring to fig. 1, taking a 5G communication system as an example, fig. 1 is a schematic view of an NTN scenario provided in an embodiment of the present application.

As shown in fig. 1, 104 represents the coverage area of one cell of satellite 101, in which one or more terminal devices 102 may be present. The coverage area 104 of the cell may be the area covered by one or more beams of a satellite or the same area as the cell level in an NR system. The ground terminal equipment 102 is accessed to the network through a 5G new air interface, and a 5G base station can be deployed on a satellite and is connected with a ground 5G core network through a wireless link and the ground station 103. Meanwhile, a wireless link exists between satellites, and signaling interaction and user data transmission between base stations are completed.

The various network elements and their interfaces in this scenario are illustrated as follows:

a terminal device: and mobile devices supporting a 5G new air interface, such as user terminals and wearable devices. The satellite network can be accessed through the air interface and the services of calling, surfing the Internet and the like can be initiated.

5G base station: the method mainly provides wireless access service, schedules wireless resources to an access terminal, and provides reliable wireless transmission protocol and data encryption protocol.

5G core network: the method comprises services of user access control, mobility management, session management, user security authentication, charging and the like. It is composed of a plurality of functional units, and can be divided into control plane and data plane functional entities.

A ground station: and is responsible for forwarding signaling and traffic data between the satellite base station and the 5G core network.

5G New air interface: a radio link between the user equipment and the base station.

An Xn interface: the method is an interface between a 5G base station and a base station, and is mainly used for signaling interaction such as switching.

NG interface: the method is an interface between a 5G base station and a 5G core network, and mainly interacts signaling such as Non-Access Stratum (NAS) of the core network and service data of a user.

The technical scheme provided by the application mainly relates to two execution main bodies of network equipment and terminal equipment, can be applied to communication systems such as 5G and the like, and is particularly applied to the data transmission process of a non-ground network.

The terminal devices involved in the embodiments of the present application include, but are not limited to, connections via wire lines, such as Public Switched Telephone Networks (PSTN), digital Subscriber Lines (DSL), digital cables, and direct cable connections; and/or another data connection network; and/or via a wireless interface, such as: for cellular networks, wireless Local Area Networks (WLANs), digital television networks such as Digital Video Broadcast-Handheld (DVB-H) networks, satellite networks, AM-FM (Amplitude Modulation-Frequency Modulation) Broadcast transmitters; and/or means of another terminal device arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal device arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of such terminal devices include, but are not limited to, satellite phones or cellular phones; personal Communications System (PCS) terminals that may combine a cellular radiotelephone with data processing, facsimile and data Communications capabilities; personal Digital Assistants (PDAs) that may include radiotelephones, pagers, internet/intranet access, web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A terminal device may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a PDA, a handheld device with wireless communication capability, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal device in a 5G network or a terminal device in a Public Land Mobile Network (PLMN) for future evolution, etc.

The network device involved in the embodiments of the present application may provide communication coverage in a specific geographic area, and may communicate with one or more terminal devices located in the coverage area, and may also be configured to communicate with one or more base stations having partial terminal functions (for example, communication between a macro base station and a micro base station, such as an access point). Alternatively, the network device may be a satellite, a Base Transceiver Station (BTS) in a GSM system or a CDMA system, an evolved Node B (eNB) in an LTE system, or a next generation Base Station (gNB) in a 5G system or an NR system, and other satellite Base stations and satellite relay nodes. In addition, the network device may also be an Access Point (AP), a transport point (TRP), a Central Unit (CU), or other network entities, and may include some or all of the above network entity functions.

It is to be understood that the device having the communication function in the network/system in the embodiment of the present application may be referred to as a communication device. Taking the communication system shown in fig. 1 as an example, the communication device may include a network device and a terminal device having a communication function, and the network device and the terminal device may be the above-mentioned specific devices, which are not described again here; the communication device may further include other devices in the communication system, such as other network entities like a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should also be noted that, in the present application, the description of "satellite" and "satellite network device" are equivalent. That is, the satellite referred to in this application means a collection of satellites and other network devices related to satellite communication.

It is understood that a cell in the NTN system may be a projection region of a beam of a satellite on the ground, a projection region of multiple beams of a satellite on the ground, or a partial region of a projection region of a beam or multiple beams on the ground.

In order to acquire uplink synchronization with the satellite, the terminal device needs to transmit uplink data in advance by a time period, which may be referred to as an overall TA pre-compensation value of the terminal device. In a general scenario, the TA value (i.e. the total TA pre-compensation value) of the terminal device performing uplink transmission is = the RTT value from the terminal device to the satellite + the common TA value broadcasted by the first cell + the TA value adjustment value indicated by the network. The RTT value between the terminal device and the satellite needs to be calculated according to ephemeris information and the position information of the terminal device obtained by using GNSS. In a Non-GNSS scenario (that is, the terminal device does not have GNSS capability and cannot acquire its own location information), the terminal device cannot calculate RTT between the terminal device and the serving satellite, and further the terminal device cannot determine a current TA value during uplink transmission (for example, the terminal device sends the first message Msg 1).

At this time, the network may configure one fixed TA value for the coverage area of each cell or the coverage area of each beam. At this time, the terminal device may calculate a TA value for performing uplink transmission (i.e., a total TA pre-compensation value) according to the fixed TA value, specifically, the total TA pre-compensation value = the fixed TA value + the common TA value broadcast by the first cell + the TA value adjustment value indicated by the network.

The distance between a point closest to the satellite in the coverage area of the cell or a beam coverage area corresponding to the cell and the satellite may be used as the fixed transmission distance of the cell or a beam corresponding to the cell. Correspondingly, the round-trip transmission delay generated when a signal is transmitted in a round-trip manner over the fixed transmission distance of the cell or a beam corresponding to the cell is referred to as the fixed round-trip delay of the cell or a beam corresponding to the cell, where the fixed round-trip delay of the cell or a beam corresponding to the cell is denoted as the fixed TA value of the cell or a beam corresponding to the cell, and a difference between the round-trip transmission delay of the signal between the terminal device and the satellite and the fixed TA value may be denoted as a round-trip transmission delay difference. The error of the fixed TA value does not exceed the maximum round-trip transmission time delay difference corresponding to the coverage area of the current cell or the coverage area of the wave beam. In the NTN system, since the distance between the terminal device and the network device is relatively long, for example, the altitude difference between the base station or the satellite and the terminal device is generally greater than 500 kilometers, the round trip transmission delay (RTT) of the terminal device in the same cell in the NTN system is much longer than the round trip transmission delay of the terminal device in the same cell in the terrestrial communication system (for example, the NR system), and the round trip transmission delay difference of the terminal device in the same cell in the NTN system is also much longer than the round trip transmission delay difference of the terminal device in the same cell in the terrestrial communication system (for example, the NR system). When the round-trip transmission delay difference corresponding to the coverage area of the cell or the coverage area of the beam is large (i.e., the coverage area of the cell or the coverage area of the beam is large), that is, the difference between the fixed TA value and the RRT between the terminal device and the satellite is large, the error of the total TA pre-compensation value determined by using the fixed TA value is large, so that the accuracy of uplink transmission time is low, uplink desynchronization is caused, and the reliability of uplink transmission is seriously influenced.

At present, a terminal device has a dual connection scenario in an NTN system, that is, the terminal device establishes a connection with 2 cells, and in the dual connection scenario, the above problem of uplink step loss also exists, which is described in detail below. Referring to fig. 2a, fig. 2a is a schematic view of a dual connection scenario provided in the embodiment of the present application.

As shown in fig. 2a, C and D respectively represent a satellite corresponding to the first cell and a satellite corresponding to the second cell, the satellite C and the satellite D are in the same satellite orbit or in different satellite orbits, and fig. 2a is drawn by taking the satellite C and the satellite D in different satellite orbits as an example. A represents the closest point to satellite C within the coverage area of the first cell; b denotes a point within the second cell, which may be the closest point within the coverage area of the second cell to the satellite C, or any fixed point within the coverage area of the second cell relative to the satellite D (e.g. the closest point to the satellite D, which is plotted in fig. 2a for example). When the terminal device needs to perform uplink transmission with the satellite C, the total TA pre-compensation value calculated by the above-mentioned fixed TA value configured for the coverage area of the first cell (i.e. RTT from point a to satellite C) is usually adopted as the TA value of uplink transmission.

It can be seen that in this scenario there is some error between the fixed TA value and the RTT value between the terminal device and the satellite C, since the terminal device is not at the position of point a, but is in the second cell. Therefore, the total TA precompensation value calculated by adopting the fixed TA value is used as the TA value for uplink transmission, so that the accuracy is low, the accuracy of uplink sending time is also low, uplink desynchronization is caused, and the reliability of uplink transmission of the terminal equipment is seriously influenced.

In particular, the above method of determining a fixed TA value can be seen in fig. 2b. As shown in fig. 2b, 203 represents a coverage area of a cell or a coverage area of a beam corresponding to the

satellite

201, 202 represents a point in the coverage area closest to the satellite 201, a distance between the point and the satellite is a fixed transmission distance in the coverage area, and a fixed round-trip transmission delay generated when a signal is transmitted to and fro over the fixed transmission distance is represented as a fixed TA value corresponding to the coverage area shown in 203.

Based on the above description, it can be known that, for the scenarios shown in fig. 2a and fig. 2b, the fixed TA value is adopted to determine that there is a large error in the total TA pre-compensation value for uplink transmission between the terminal device and the satellite C (when the coverage area of the first cell or the coverage area of the beam is larger, the error is more obvious), that is, there is a large difference between the TA value of the terminal device determined by the method and the TA value that the terminal device should originally use, so that the accuracy of the uplink transmission time of the terminal device is low, and uplink desynchronization is caused, thereby seriously affecting the reliability of uplink transmission.

In addition, in the process of random access, after the terminal device sends the first message Msg1, it needs to determine the starting position of the random access response window, that is, determine the time interval between the ending position of sending the first message Msg1 and the starting position of the random access response window, and monitor a Physical Downlink Control Channel (PDCCH) in the random access response window. Currently, the terminal device determines the starting position of the random access response window according to the total TA pre-compensation value and an amount of time indicated by the network. In a Non-GNSS scenario, a total TA value compensation value calculated according to a fixed TA value has a large error, which results in that an initial position of a random access response window determined by a terminal device is not accurate enough, and thus energy consumption of the terminal device is increased or the terminal device cannot receive a random access response message issued by a network, which seriously affects a success rate of UE random access and increases a time delay of UE access to the network.

Specifically, referring to fig. 3, fig. 3 is an interaction diagram of random access according to an embodiment of the present disclosure.

As shown in fig. 3, the terminal device first reads a Master Information Block (MIB) and a first System Information Block (System Information Block 1, sib1) to complete downlink synchronization. By reading SIB1, the terminal device determines the resources used to send the preamble (i.e. the first message Msg 1) to the network to indicate its intention to access the network. If the Network correctly receives the Msg1, the Network sends a random access response message (i.e. a second message Msg 2) scrambled by a random access-Radio Network Temporary Identifier (RA-RNTI) to the terminal device. After sending Msg1, the terminal device can use the RA-RNTI to monitor Msg2 from the network to descramble the message. The RA-RNTI is calculated from time and frequency resources of a Random Access Channel (RO). The Msg2 may include a TA value, a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI), a power adjustment, and a resource indication that the terminal device sends the third message Msg 3. The terminal then sends its identity and initial access setup (i.e. Msg 3) to the network via the uplink scheduling indication in Msg 2. Finally, the network may notify the terminal device of the completion of the initial access procedure through the fourth message Msg4, otherwise, the terminal device may determine that the initial access procedure fails.

In order to solve the above-mentioned problem of low uplink transmission reliability in the Non-GNSS scenario and the problem of low random access success rate and long access delay of the terminal device, an embodiment of the present application provides a new data transmission method, where the data transmission method may determine a target TA value used for representing RTT between the terminal device and a serving satellite by receiving a first TA value sent by a first network device or a second network device, so as to determine a TA value (i.e., a total TA pre-compensation value) for performing uplink data transmission between the terminal device and the first network device, so that accuracy of uplink transmission time is high, and uplink desynchronization of the terminal device in the Non-GNSS scenario is avoided. And, the initial position of the random access response window is determined by using the first TA value, so that the success rate of the random access of the terminal equipment can be improved, and the time delay of the access of the terminal equipment to the network can be reduced.

Based on any application scenario, the NTN-based data transmission method provided by the present solution will be described in detail below through a specific implementation.

Referring to fig. 4, fig. 4 is a schematic flow chart of a data transmission method according to an embodiment of the present application, where the method includes, but is not limited to, the following steps:

step 401: the first network equipment sends the first TA value to the terminal equipment. Correspondingly, the terminal device receives the first TA value sent by the first network device.

The first TA value is a cell-level or beam-level TA value indicated by the second cell, the cell-level TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell, the beam-level TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of one beam in the second cell, a coverage area of the second cell overlaps with a coverage area of the first cell, specifically, the coverage area of the first cell overlaps with the coverage area of the second cell partially, or the coverage area of the first cell completely includes the coverage area of the second cell, and the terminal device may be located in an overlapping portion of the coverage areas of the first cell and the second cell. The first network device is a network device corresponding to the first cell.

In a possible implementation manner, before step 401, the first network device determines the first TA value, and the specific process may refer to the embodiment shown in fig. 6 below.

In a possible implementation manner, the reference point may be a point within the coverage area of the second cell that is closest to the satellite corresponding to the first cell, or may be any fixed point within the coverage area of the second cell with respect to the position of the satellite corresponding to the second cell.

In one possible embodiment, the satellite corresponding to the first cell and the satellite corresponding to the second cell may be on the same satellite orbit or on different satellite orbits.

Step 402: and the terminal equipment determines a target TA value according to the first TA value.

The target TA value is used to indicate an opportunity to transmit uplink data to the first network device.

Step 402 may be implemented in the following manner 1 or manner 2 when implemented specifically.

In the method 1, the terminal device determines the received first TA value as a target TA value.

And in the mode 2, the terminal equipment determines the sum of the second TA value and/or the third TA value and the received first TA value as the target TA value.

In a specific implementation of the method 2, the terminal device may use a sum of the second TA value and the first TA value as the target TA value, may use a sum of the third TA value and the first TA value as the target TA value, and may use a sum of the first TA value, the second TA value, and the third TA value as the target TA value. Optionally, the second TA value and the third TA value are obtained from a broadcast message corresponding to the first cell, where the second TA value is a public TA value broadcast by the first cell, and the third TA value includes a timing adjustment value and/or a timing offset value issued by the first cell.

In the embodiment of the application, the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell, and compared with the fixed TA value, the first TA value is closer to the round-trip transmission delay between the terminal device and the satellite corresponding to the first cell, so that the accuracy of the first TA value is higher, and the accuracy of the target TA value determined based on the received first TA value is higher, so that the accuracy of the TA value for uplink data transmission between the determined terminal device and the first network device is higher, the accuracy of uplink transmission time is higher, uplink desynchronization of the terminal device in a Non-GNSS scene is avoided, and the reliability of uplink transmission of the terminal device is greatly improved.

Step 403: and the terminal equipment performs uplink data transmission with the first network equipment according to the target TA value.

Step 403 may include, in particular implementation: specifically, the terminal device may perform uplink data transmission with a base station corresponding to the first cell within the first cell or within a beam coverage area of the first cell. Optionally, the uplink data includes, but is not limited to, random access channel data, or physical uplink shared channel data, or physical uplink control channel data. By the embodiment of the application, the reliability of uplink transmission of the terminal equipment can be greatly improved.

The terminal device in this embodiment of the present application is a device equipped with a processor capable of executing a computer execution instruction, where the terminal device may be a mobile phone, a computer, a vehicle, a wearable device, and the like, and specifically may be the terminal device 102 in fig. 1, and is configured to receive a first TA value sent by a first network device, determine a target TA value used for representing RTT between the terminal device and a service satellite, and further determine a TA value for performing uplink data transmission between the terminal device and the first network device, avoid uplink desynchronization of the terminal device in a Non-GNSS scenario, and improve reliability of uplink transmission of the terminal device. The first network device in this embodiment is a different device carrying a processor capable of executing a computer to execute instructions, and the first network device may be a satellite, a base station or a gateway in a GSM system or a CDMA system, and may specifically be the base station in the satellite 101 in fig. 1, and is configured to send the first TA value to the terminal device.

For example, referring to fig. 5, a coverage area 504 of a second cell is included in a coverage area 503 of a first cell, the first cell and the second cell are two cells corresponding to the terminal device establishing dual connectivity, a coverage area of a beam in the first cell or the first cell is larger, a coverage area of a beam in the second cell or the second cell is smaller, and a satellite 501 corresponding to the first cell and a satellite 502 corresponding to the second cell are on different satellite orbits. The satellite 501 may be a medium orbit earth satellite (MEO), a geostationary orbit satellite (GEO), or the like, and the satellite 502 may be a low orbit earth satellite (LEO), a High Altitude Platform (HAPS), or the like.

When the terminal device performs uplink transmission with the first cell in the first cell or within the beam coverage range of the first cell, the total TA pre-compensation value (i.e., the above-mentioned target TA value) may be determined according to the cell level or the specific TA value of the beam level (i.e., the first TA value, and a line 505 in fig. 5) indicated by the first network device in the first cell. The specific TA value of the cell level is an RTT value from the position of the satellite 501 corresponding to the first cell to a reference point in the coverage area of the second cell, and the specific TA value of the beam level is an RTT value from the position of the satellite 501 corresponding to the first cell to a reference point in the coverage area of a beam in the second cell. The reference point may be a point closest to the position of the satellite 501 corresponding to the first cell in the coverage area of the second cell (or one beam in the second cell), or may be any fixed point relative to the position of the satellite 502 corresponding to the second cell in the coverage area of the second cell (or one beam in the second cell).

Optionally, the method provided in this embodiment further includes:

and step 11) the terminal equipment determines the initial position of the random access response window according to the first TA value. The step 11) and the step 402 and/or the step 403 are not executed in sequence.

Step 11) in specific implementation, the terminal device may determine the starting position of the random access response window according to the first TA value when initiating random access to the first cell.

Step 11), when implemented specifically, may include step 11-1) and step 11-2):

step 11-1): and the terminal equipment determines the second TA value and/or the first time delay value and the sum of the first TA value as the second time delay value. The first time delay value is an effective time delay value of a media access layer control unit of the first cell, and the second TA value is a public TA value broadcasted by the first cell. Optionally, the second TA value and the first time delay value may be obtained through a broadcast message corresponding to the first cell.

The step 11-1) may include, in specific implementation: the terminal equipment takes the sum of the second TA value and the first TA value as a second time delay value; or the terminal device takes the sum of the first time delay value and the first TA value as a second time delay value; or the terminal device takes the second TA value, the first time delay value and the sum of the first TA value as the second time delay value.

Step 11-2): and the terminal equipment determines the starting position of the random access response window according to the ending position of the first message Msg1 sent to the first cell and the determined second time delay value.

After the initial position of the random access response window is determined, the terminal equipment starts monitoring the random access response window at the initial position of the random access response window, so that the random access response message can be accurately received, the success rate of random access of the terminal equipment is improved, and the time delay of the terminal equipment for accessing the network is reduced.

By the embodiment of the application, the starting position of the random access response window can be determined more accurately, so that monitoring on the random access response window is started more accurately.

Referring to fig. 6, fig. 6 is a flow for determining a first TA value by a first network device according to an embodiment of the present application, which specifically includes:

step 601: the second network device sends location information of the coverage area of the second cell to the first network device. Correspondingly, the first network device receives the location information of the coverage area of the second cell sent by the second network device.

And the second network equipment is the network equipment corresponding to the second cell.

In this embodiment, the second cell base station (i.e., the second network device) needs to perform information interaction with the first cell base station (i.e., the first network device), that is, the second cell base station needs to notify, through an Xn Inter-satellite link (ISL), the first cell base station that the terminal device is in the coverage area of the second cell or the coverage area of a certain beam in the second cell.

Step 602: and the first network equipment determines a first TA value according to the position information of the coverage area of the second cell and the position information of the satellite corresponding to the first cell.

According to the embodiment of the application, the target TA value used for representing RTT between the terminal equipment and the service satellite can be determined based on the position information of the coverage area of the second cell and the first TA value determined by the position information of the satellite corresponding to the first cell, so that the TA value of uplink data transmission between the terminal equipment and the first network equipment is determined, the accuracy of uplink sending time is high, uplink desynchronization of the terminal equipment in a Non-GNSS scene is avoided, and the reliability of uplink transmission of the terminal equipment is greatly improved.

Referring to fig. 7a, fig. 7a is a schematic flow chart of another data transmission method according to an embodiment of the present application, where the method includes, but is not limited to, the following steps:

step 701: and the second network equipment sends the first TA value to the terminal equipment. Correspondingly, the terminal device receives the first TA value sent by the second network device.

For the description of the first network device, the second network device, the terminal device, the first cell, the second cell, the first TA value, and the reference point, reference may be made above, and details are not repeated here.

Optionally, the following situation exists when the second network device sends the first TA value to the terminal device:

case 1, when a radio resource control connection is not established with the terminal device, that is, when the second cell is in an idle state or an inactive state:

in case 1.1, the second network device may issue the first TA value of the cell level to the terminal device through the system information. And the terminal equipment determines the first TA value of the cell level by receiving the system message sent by the second cell.

In case 1.2, the second network device may issue the first TA value corresponding to each beam in the second cell to the terminal device through the system information (that is, the RTT value between the reference point in the coverage area of each beam in the second cell and the satellite position corresponding to the first cell), and the terminal device determines the first TA value corresponding to each beam in the cell by receiving the system information issued by the second cell.

Case 2: when a radio resource control connection is established with the terminal device, i.e. for the case where the second cell is in a connected state:

in case 2.1, the second network device may issue the first TA value at the cell level to the terminal device through system information, RRC signaling, or a Media access control element (MAC CE), and the terminal device determines the first TA value at the cell level by receiving the system information, RRC signaling, or MAC CE signaling issued by the second cell.

In case 2.2, the second network device may issue the first TA value corresponding to each beam in the second cell to the terminal device through the system information, the RRC signaling, or the MAC CE signaling (that is, the RTT value between the reference point in the coverage area of each beam in the second cell and the satellite position corresponding to the first cell), and the terminal device determines the first TA value corresponding to each beam in the cell by receiving the system information, the RRC signaling, or the MAC CE signaling issued by the second cell. Optionally, before step 701, the method further includes:

and the second network equipment determines a first TA value according to the position information of the coverage area of the second cell and the position information of the satellite corresponding to the first cell.

Step 702: and the terminal equipment determines a target TA value according to the first TA value.

The relevant description of step 702 can be found in step 402 above.

Optionally, the method in the embodiment of the present application further includes:

step 703: and the terminal equipment performs uplink data transmission with the first network equipment according to the target TA value.

The description of step 703 can be found in step 403.

For example, referring to fig. 7b, the description about the first cell and the second cell in fig. 7b may refer to fig. 5, and details are not repeated. In fig. 7b, when the terminal device performs uplink transmission with the first cell in the first cell or the beam coverage area in the first cell, the total TA pre-compensation value (i.e., the target TA value) may be determined according to the specific TA value (i.e., the first TA value) of the cell level or the beam level indicated by the second network device in the second cell. The specific TA value at the cell level is an RTT value from the position of the satellite 501 corresponding to the first cell to a reference point in the coverage area of the second cell, and the specific TA value at the beam level is an RTT value from the position of the satellite 501 corresponding to the first cell to a reference point in the coverage area of a beam in the second cell. The reference point may be a point closest to the position of the satellite 501 corresponding to the first cell in the coverage area of the second cell (or one beam in the second cell), or may be any fixed point relative to the position of the satellite 502 corresponding to the second cell in the coverage area of the second cell (or one beam in the second cell).

Optionally, this embodiment further includes step 11-1) and step 11-2) described above.

The method of the embodiments of the present application is explained in detail above, and the apparatus of the embodiments of the present application is provided below.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a data transmission device according to an embodiment of the present application, where the data transmission device 80 may include a receiving unit 801, a determining unit 802, and a transmitting unit 803, where the units are described as follows:

a receiving unit 801, configured to receive a first TA value sent by a first network device or a second network device; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, a coverage area of the second cell overlaps with a coverage area of the first cell, and the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

a determining unit 802, configured to determine a target TA value according to the first TA value;

a transmitting unit 803, configured to perform uplink data transmission with the first network device according to the target TA value.

In a possible embodiment, the apparatus further comprises:

the determining unit 802 is further configured to determine, according to the first TA value, an initial position of a random access response window when initiating random access to the first cell;

a monitoring unit 804, configured to start monitoring the random access response window at a start position of the random access response window.

According to the embodiment of the present application, the units in the apparatus shown in fig. 8 may be respectively or completely combined into one or several other units to form the apparatus, or some unit(s) therein may also be further split into multiple functionally smaller units to form the apparatus, which may implement the same operation without affecting the implementation of the technical effect of the embodiment of the present application. The units are divided based on logic functions, and in practical applications, the functions of one unit can also be implemented by a plurality of units, or the functions of a plurality of units can also be implemented by one unit. In other embodiments of the present application, the network-based device may also include other units, and in practical applications, these functions may also be implemented by being assisted by other units, and may be implemented by cooperation of multiple units.

It should be noted that the implementation of each unit may also correspond to the corresponding description with reference to the method embodiment shown in fig. 4.

In the embodiment of the present application, the data transmission device may be the terminal device shown above or a chip in the terminal device, etc. I.e. the data transmission means may be adapted to perform the steps or functions etc. performed by the terminal device in the above method embodiments.

In the data transmission apparatus 80 depicted in fig. 8, by receiving the first TA value sent by the first network device or the second network device, the target TA value used for indicating RTT between the terminal device and the service satellite may be determined, so as to determine the TA value for performing uplink data transmission between the terminal device and the first network device, so that the accuracy of uplink transmission time is higher, uplink desynchronization of the terminal device in a Non-GNSS scenario is avoided, and the reliability of uplink transmission of the terminal device is greatly improved.

The data transmission device according to the embodiment of the present application is described above, and possible product forms of the data transmission device are described below. It should be understood that any product having the functions of the data transmission device described in fig. 8 may fall into the scope of the embodiments of the present application. It should also be understood that the following description is only exemplary and does not limit the product form of the data transmission device according to the embodiments of the present application.

In a possible implementation manner, in the data transmission apparatus shown in fig. 8, each processing unit may correspond to one or more processors, where the receiving unit 801 may correspond to a receiver, the transmitting unit 803 may correspond to a generator, and the receiving unit 801 and the transmitting unit 803 may also be integrated into one device, such as a transceiver. In this embodiment, the processor and the transceiver may be coupled, and the like, and the coupling in this embodiment is an indirect coupling or a communication connection between the devices, units, or modules, and may be in an electrical, mechanical, or other form, which is used for information interaction between the devices, units, or modules. The embodiment of the present application is not limited to the connection manner between the processor and the transceiver.

Referring to fig. 9, fig. 9 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present application, where the data transmission apparatus 90 may include a receiving unit 901, a determining unit 902, and a sending unit 903, where descriptions of the units are as follows:

a receiving unit 901, configured to receive location information of a coverage area of a second cell sent by a second network device; the data transmission device is a device corresponding to a first cell, the second network device is a network device corresponding to a second cell, and the coverage area of the second cell is overlapped with the coverage area of the first cell;

a determining unit 902, configured to determine a first TA value according to the location information of the coverage area of the second cell and the location information of the satellite corresponding to the first cell; the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

a sending unit 903, configured to send the first TA value to a terminal device.

According to the embodiment of the present application, the units in the apparatus shown in fig. 9 may be respectively or entirely combined into one or several other units to form a structure, or some unit(s) therein may be further split into multiple functionally smaller units to form a structure, which may achieve the same operation without affecting the achievement of the technical effect of the embodiment of the present application. The units are divided based on logic functions, and in practical application, the functions of one unit can be realized by a plurality of units, or the functions of a plurality of units can be realized by one unit. In other embodiments of the present application, the network-based device may also include other units, and in practical applications, these functions may also be implemented by being assisted by other units, and may be implemented by cooperation of multiple units.

It should be noted that the implementation of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 6 described above.

In the embodiment of the present application, the data transmission apparatus may be the first network device shown above or a chip in the first network device, and the like. I.e. the data transmission means may be adapted to perform the steps or functions etc. performed by the first network device in the above method embodiments.

In the data transmission apparatus 90 depicted in fig. 9, by receiving the first TA value sent by the first network device or the second network device, the target TA value used for indicating the RTT between the terminal device and the service satellite may be determined, so as to determine the TA value for performing uplink data transmission between the terminal device and the first network device, so that the accuracy of uplink transmission time is higher, uplink desynchronization of the terminal device in a Non-GNSS scenario is avoided, and the reliability of uplink transmission of the terminal device is greatly improved.

The data transmission device according to the embodiment of the present application is described above, and possible product forms of the data transmission device are described below. It should be understood that any product having the functions of the data transmission device described in fig. 9 may fall within the scope of the embodiments of the present application. It should also be understood that the following description is only exemplary and does not limit the product form of the data transmission device according to the embodiments of the present application.

In a possible implementation manner, in the data transmission apparatus shown in fig. 9, each processing unit may correspond to one or more processors, wherein the receiving unit 901 may correspond to a receiver, the sending unit 903 may correspond to a generator, and the receiving unit 901 and the sending unit 903 may also be integrated into one device, such as a transceiver. In this embodiment, the processor and the transceiver may be coupled, and the like, and the coupling in this embodiment is an indirect coupling or a communication connection between the devices, units, or modules, and may be in an electrical, mechanical, or other form, which is used for information interaction between the devices, units, or modules. The embodiment of the present application is not limited to the connection mode between the processor and the transceiver.

Referring to fig. 10, fig. 10 is a schematic structural diagram of another data transmission device according to an embodiment of the present application, where the data transmission device 100 may include a determining unit 1001 and a sending unit 1002, where the units are described as follows:

a determining unit 1001, configured to determine a first TA value according to location information of a coverage area of a second cell and location information of a satellite corresponding to a first cell;

a sending unit 1002, configured to send the first TA value to a terminal device; the data transmission device is a device corresponding to the second cell, the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell, and the coverage area of the second cell overlaps with the coverage area of the first cell;

or, the sending unit 1002 is configured to send, to the first network device, location information of a coverage area of the second cell; the first network device is a network device corresponding to a first cell, the data transmission device is a device corresponding to a second cell, the location information of the coverage area of the second cell is used for determining a first TA value, the first TA value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell, and the coverage area of the second cell overlaps with the coverage area of the first cell.

According to the embodiment of the present application, the units in the apparatus shown in fig. 10 may be respectively or entirely combined into one or several other units to form a structure, or some unit(s) therein may be further split into multiple functionally smaller units to form a structure, which may achieve the same operation without affecting the achievement of the technical effect of the embodiment of the present application. The units are divided based on logic functions, and in practical application, the functions of one unit can be realized by a plurality of units, or the functions of a plurality of units can be realized by one unit. In other embodiments of the present application, the network-based device may also include other units, and in practical applications, these functions may also be implemented with the assistance of other units, and may be implemented by cooperation of multiple units.

It should be noted that the implementation of each unit may also correspond to the corresponding description of the method embodiment shown in fig. 7a described above.

In the embodiment of the present application, the data transmission apparatus may be the second network device shown above or a chip in the second network device, and the like. I.e. the data transmission means may be adapted to perform the steps or functions, etc. performed by the second network device in the above method embodiments.

In the data transmission apparatus 100 depicted in fig. 10, by receiving the first TA value sent by the first network device or the second network device, the target TA value used for representing RTT between the terminal device and the service satellite may be determined, so as to determine the TA value for performing uplink data transmission between the terminal device and the first network device, so that the accuracy of uplink transmission time is higher, uplink desynchronization of the terminal device in a Non-GNSS scenario is avoided, and the reliability of uplink transmission of the terminal device is greatly improved.

The data transmission device according to the embodiment of the present application is described above, and possible product forms of the data transmission device are described below. It should be understood that any product having the functions of the data transmission device described in fig. 10 may fall into the scope of the embodiments of the present application. It should also be understood that the following description is only exemplary and does not limit the product form of the data transmission device according to the embodiments of the present application.

In a possible implementation manner, in the data transmission apparatus shown in fig. 10, each processing unit may correspond to one or more processors, wherein the sending unit 1002 may correspond to a generator, and may also be integrated into one transceiver. In this embodiment, the processor and the transceiver may be coupled, and the like, and the coupling in this embodiment is an indirect coupling or a communication connection between the devices, units, or modules, and may be in an electrical, mechanical, or other form, which is used for information interaction between the devices, units, or modules. The embodiment of the present application is not limited to the connection mode between the processor and the transceiver.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a communication device 110 according to an embodiment of the present disclosure. The communication device 110 may include a memory 1101, a processor 1102. Further optionally, a communication interface 1103 and a bus 1104 may be included, wherein the memory 1101, the processor 1102 and the communication interface 1103 are communicatively connected to each other through the bus 1104. The communication interface 1103 is used for data interaction with the data transmission device 80, the data transmission device 90, or the data transmission device 100.

In the embodiment of the present application, a specific connection medium between the communication interface 1103, the processor 1102, and the memory 1101 is not limited. In the embodiment of the present application, the memory 1101, the processor 1102 and the communication interface 1103 are connected by a bus 1104 in fig. 11, the bus is denoted by a reference numeral in fig. 11, and the connection manner between other components is only schematically illustrated and is not limited. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one line is shown in FIG. 11, but that does not indicate only one bus or type of bus.

The memory 1101 is used to provide a storage space, and the storage space may store data such as an operating system and a computer program. The memory 1101 includes, but is not limited to, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM). The memory in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.

The processor 1102 is a module for performing arithmetic operations and logical operations, and may be one or a combination of plural kinds of processing modules such as a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a microprocessor unit (MPU), or the like. The processor may implement or execute each method, step, and logic block disclosed in the embodiments of the present application, and the steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or implemented by a combination of hardware and software modules in the processor.

The memory 1101 stores a computer program, and the processor 1102 calls the computer program stored in the memory 1101 to execute the data transmission method shown in fig. 4:

determining a target TA value according to the first TA value;

For details of the method executed by the processor 1102, reference may be made to fig. 4, which is not described herein again.

Accordingly, the processor 1102 calls the computer program stored in the memory 1101, and may also be configured to execute the method steps executed by each unit in the data transmission device 80 shown in fig. 8, and specific contents thereof may refer to fig. 8, which is not described herein again.

On the other hand, the memory 1101 stores a computer program, and the processor 1102 calls the computer program stored in the memory 1101 to execute the data transmission method shown in fig. 6:

and sending the first TA value to terminal equipment.

For details of the method executed by the processor 1102, reference may be made to fig. 6, which is not described herein again.

Accordingly, the processor 1102 calls the computer program stored in the memory 1101, and may also be configured to execute the method steps executed by each unit in the data transmission device 90 shown in fig. 9, and specific contents thereof may refer to fig. 9, which is not described herein again.

In yet another aspect, a computer program is stored in the memory 1101, and the processor 1102 calls the computer program stored in the memory 1101 to execute the data transmission method shown in fig. 7a as described above:

For details of the method executed by the processor 1102, reference may be made to fig. 7a, which is not described herein again.

Accordingly, the processor 1102 calls the computer program stored in the memory 1101, and may also be configured to execute the method steps executed by each unit in the data transmission apparatus 100 shown in fig. 10, and specific content thereof may refer to fig. 10, which is not described herein again.

In the communication apparatus 110 depicted in fig. 11, by receiving the first TA value sent by the first network device or the second network device, the target TA value used for representing RTT between the terminal device and the service satellite may be determined, so as to determine the TA value for performing uplink data transmission between the terminal device and the first network device, so that the accuracy of uplink transmission time is higher, uplink desynchronization of the terminal device in a Non-GNSS scenario is avoided, and the reliability of uplink transmission of the terminal device is greatly improved.

It is understood that the communication device shown in the embodiment of the present application may have more components than those shown in fig. 11, and the embodiment of the present application is not limited thereto. The method performed by the processor shown above is only an example, and reference may be made to the method described above for the steps specifically performed by the processor.

Referring to fig. 12, fig. 12 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure.

The communication device includes a logic circuit 1201 and an interface 1202. The logic circuit 1201 may be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, and the interface 1202 may be a communication interface, an input/output interface, a pin, and the like. Exemplarily, fig. 12 illustrates a chip as the communication device, where the chip includes a logic circuit 1201 and an interface 1202.

In the embodiments of the present application, the logic circuit and the interface may also be coupled to each other. The embodiment of the present application is not limited to a specific connection manner of the logic circuit and the interface.

It is understood that reference may be made to the apparatus shown in fig. 11 for a detailed description of the logic circuits and interfaces.

It is understood that the communication device shown in the embodiment of the present application may implement the method provided in the embodiment of the present application in the form of hardware, or may implement the method provided in the embodiment of the present application in the form of software, and the embodiment of the present application is not limited thereto.

For the specific implementation of the embodiments shown in fig. 12, reference may also be made to the above-mentioned embodiments, which are not described in detail here.

Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed on one or more processors, the method shown in fig. 4, fig. 6, and fig. 7a may be implemented.

Embodiments of the present application further provide a computer program product, where the computer program product includes a computer program, and when the computer program product is run on a processor, the method shown in fig. 4, fig. 6, and fig. 7a may be implemented.

The embodiment of the present application further provides a chip, where the chip includes a processor, and the processor is configured to execute instructions, and when the processor executes the instructions, the method shown in fig. 4, fig. 6, and fig. 7a may be implemented. Optionally, the chip further comprises a communication interface for inputting signals or outputting signals.

The embodiment of the present application further provides a system, which includes at least one of the above-mentioned data transmission device 80, data transmission device 90, data transmission device 100, communication device 110, or communication device or chip in fig. 12.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electrical, mechanical or other form of connection.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the technical effect of the solution provided by the embodiment of the present application.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application may substantially or partially contribute to the prior art, or all or part of the technical solutions may be embodied in the form of a software product, which is stored in a readable storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned readable storage medium comprises: a U-disk, a portable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A data transmission method is applied to terminal equipment and is characterized by comprising the following steps:

receiving a first timing advance value sent by first network equipment or second network equipment; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, a coverage area of the second cell overlaps with a coverage area of the first cell, and the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

determining a target timing advance value according to the first timing advance value;

and carrying out uplink data transmission with the first network equipment according to the target timing advance value.

2. The method of claim 1, wherein the first timing advance value is obtained according to position information of a coverage area of the second cell and position information of a satellite corresponding to the first cell.

3. The method according to claim 1 or 2, wherein the receiving the first timing advance value sent by the second network device comprises:

under the condition that the wireless resource control connection with the second cell is not established, receiving a broadcast message sent by the second network equipment, and acquiring the first timing advance value; or,

and under the condition of establishing radio resource control connection with the second cell, receiving a broadcast message or a radio resource control signaling or a media access layer control signaling sent by the second network equipment, and acquiring the first timing advance value.

4. The method of any of claims 1 to 3, wherein determining a target timing advance value based on the first timing advance value comprises:

taking the first timing advance value as the target timing advance value;

or, taking the sum of the second and/or third timing advance values and the first timing advance value as the target timing advance value; the second timing advance value and the third timing advance value are obtained from a broadcast message corresponding to the first cell, the second timing advance value is a common timing advance value broadcast by the first cell, and the third timing advance value includes a timing adjustment value and/or a timing offset value issued by the first cell.

5. The method according to any of claims 1 to 4, wherein the performing uplink data transmission with the first network device according to the target timing advance value comprises:

advancing the target timing advance value, and sending uplink data to the first network device; the uplink data comprises physical random access channel data, or physical uplink shared channel data, or physical uplink control channel data.

6. The method according to any of claims 1 to 5, wherein the reference point is a closest point within the coverage area of the second cell to the satellite corresponding to the first cell, or is any fixed point within the coverage area of the second cell relative to the position of the satellite corresponding to the second cell.

7. The method of any of claims 1 to 6, wherein the satellite corresponding to the first cell is in the same satellite orbit or in a different satellite orbit than the satellite corresponding to the second cell.

8. The method according to any one of claims 1 to 7, further comprising:

under the condition of initiating random access to the first cell, determining the initial position of a random access response window according to the first timing advance value;

9. The method of claim 8, wherein determining a starting position of a random access response window according to the first timing advance value comprises:

taking the sum of the second timing advance value or the first time delay value and the first timing advance value as a second time delay value; the second timing advance value and the first delay value are obtained from a broadcast message corresponding to the first cell, the second timing advance value is a common timing advance value broadcast by the first cell, and the first delay value is an effective delay value of a media access layer control unit of the first cell;

and determining the starting position of the random access response window according to the end position of the first message Msg1 sent to the first cell and the second time delay value.

10. A data transmission method is applied to a first network device, and is characterized by comprising the following steps:

receiving the position information of the coverage area of the second cell sent by the second network equipment; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, and the coverage area of the second cell is overlapped with the coverage area of the first cell;

determining a first timing advance value according to the position information of the coverage area of the second cell and the position information of the satellite corresponding to the first cell; the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

and sending the first timing advance value to the terminal equipment.

11. The method of claim 10, wherein the sending the first timing advance value to a terminal device comprises:

and sending a radio resource control signaling or a media access layer control signaling to the terminal equipment, wherein the radio resource control signaling or the media access layer control signaling is used for indicating the first timing advance value to the terminal equipment.

12. The method of claim 10 or 11, wherein the reference point is a closest point within the coverage area of the second cell to the satellite corresponding to the first cell, or any fixed point within the coverage area of the second cell relative to the position of the satellite corresponding to the second cell.

13. The method of any of claims 10 to 12, wherein the satellite corresponding to the first cell is in the same satellite orbit or in a different satellite orbit than the satellite corresponding to the second cell.

14. A data transmission method is applied to a second network device, and is characterized by comprising the following steps:

determining a first timing advance value according to the position information of the coverage area of the second cell and the position information of the satellite corresponding to the first cell, and sending the first timing advance value to the terminal equipment; the second network device is a network device corresponding to the second cell, the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell, and the coverage area of the second cell overlaps with the coverage area of the first cell;

or, sending the location information of the coverage area of the second cell to the first network device; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, the position information of the coverage area of the second cell is used for determining a first timing advance value, the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell, and the coverage area of the second cell is overlapped with the coverage area of the first cell.

15. The method of claim 14, wherein the sending the first timing advance value to the terminal device comprises:

under the condition that the wireless resource control connection is not established with the terminal equipment, sending a broadcast message; the broadcast message is to indicate the first timing advance value; or,

under the condition of establishing radio resource control connection with the terminal equipment, sending a broadcast message, or sending a radio resource control signaling to the terminal equipment, or sending a media access layer control signaling to the terminal equipment; the broadcast message or the radio resource control signaling or the media access layer control signaling is used to indicate the first timing advance value.

16. The method of claim 14 or 15, wherein the reference point is a closest point within the coverage area of the second cell to the satellite corresponding to the first cell, or any fixed point within the coverage area of the second cell relative to the position of the satellite corresponding to the second cell.

17. The method of any of claims 14 to 16, wherein the satellite corresponding to the first cell is in the same satellite orbit as the satellite corresponding to the second cell, or in a different satellite orbit.

18. A data transmission apparatus, comprising:

a receiving unit, configured to receive a first timing advance value sent by a first network device or a second network device; the first network device is a network device corresponding to a first cell, the second network device is a network device corresponding to a second cell, a coverage area of the second cell is overlapped with a coverage area of the first cell, and the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

a determining unit, configured to determine a target timing advance value according to the first timing advance value;

and the transmission unit is used for carrying out uplink data transmission with the first network equipment according to the target timing advance value.

19. A data transmission apparatus, comprising:

a determining unit, configured to determine a first timing advance value according to the location information of the coverage area of the second cell and the location information of the satellite corresponding to the first cell; the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell;

a sending unit, configured to send the first timing advance value to a terminal device.

20. A data transmission apparatus, comprising:

a determining unit, configured to determine a first timing advance value according to the position information of the coverage area of the second cell and the position information of the satellite corresponding to the first cell; a sending unit, configured to send the first timing advance value to a terminal device; the data transmission device is a device corresponding to the second cell, the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in a coverage area of the second cell, and the coverage area of the second cell is overlapped with the coverage area of the first cell;

or, the sending unit is configured to send location information of a coverage area of the second cell to the first network device; the first network device is a network device corresponding to a first cell, the location information of the coverage area of the second cell is used to determine a first timing advance value, the first timing advance value is a round-trip transmission delay value from a satellite corresponding to the first cell to a reference point in the coverage area of the second cell, and the coverage area of the second cell overlaps with the coverage area of the first cell.

21. A communications apparatus, comprising: a processor and a memory;

the memory is used for storing computer execution instructions;

the processor is configured to execute computer-executable instructions stored by the memory to cause the communication device to perform the method of any one of claims 1 to 9, or to cause the communication device to perform the method of any one of claims 10 to 13, or to cause the communication device to perform the method of any one of claims 14 to 17.

22. A communications apparatus, comprising: a logic circuit and an interface; the logic circuit is coupled with the interface;

the interface is for inputting and/or outputting code instructions, and the logic circuit is for executing the code instructions to cause the method of any one of claims 1 to 9 to be performed, or to cause the method of any one of claims 10 to 13 to be performed, or to cause the method of any one of claims 14 to 17 to be performed.

23. A computer-readable storage medium, comprising:

the computer-readable storage medium is used for storing instructions or a computer program; the instructions or the computer program, when executed, cause the method of any one of claims 1 to 9 to be implemented, or cause the method of any one of claims 10 to 13 to be implemented, or cause the method of any one of claims 14 to 17 to be implemented.

24. A computer program product, comprising: instructions or computer programs;

the instructions or the computer program, when executed, cause the method of any one of claims 1 to 9 to be implemented, or cause the method of any one of claims 10 to 13 to be implemented, or cause the method of any one of claims 14 to 17 to be implemented.