SDT processing method, communication device and storage medium for non-terrestrial network

Abstract

The present disclosure provides an SDT processing method, a communication device and a storage medium for a non-terrestrial network, which can be applied to an NTN network system. The method includes: determining the location information of a terminal device; and judging the SDT transmission condition according to the location information of the terminal device. Thus, by considering the location information when applying the SDT technology in the NTN network, when the signal quality is used as the decision condition, the NTN network cell can cover the near-far effect of the signal quality and avoid interference within the cell, so that the NTN network can support SDT.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to an SDT processing method, a communication device and a storage medium for a non-terrestrial network. Background Art

[0002] NTN (Non-terrestrial Network) is an important technology introduced by 5G (5th Generation Mobile Communication Technology), which provides wireless resources through satellites (or drones) instead of ground base stations. At present, the SDT (Small Data Transmission) solution is mainly designed for TN (Tenant Network) networks. However, how to apply SDT technology in NTN networks so that NTN networks can support SDT has become an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present disclosure provide an SDT processing method for a non-terrestrial network, which can be applicable to an NTN network system. By considering location information when applying the SDT technology in the NTN network, when the signal quality is used as a decision condition, the NTN network cell can cover the near-far effect of the signal quality and avoid interference within the cell, so that the NTN network can support SDT.

[0004] In a first aspect, an embodiment of the present disclosure provides an SDT processing method for a non-terrestrial network, the method being executed by a terminal device, the method comprising:

[0005] Determining location information of the terminal device;

[0006] The SDT transmission condition is determined based on the location information of the terminal device.

[0007] In this technical solution, by considering the location information when applying the SDT technology in the NTN network, the NTN network can support SDT.

[0008] In one implementation, the determining of the SDT transmission condition based on the location information of the terminal device includes: determining whether a timing advance TA value used for the SDT is valid based on the location information of the terminal device.

[0009] In a possible implementation, the determining whether the timing advance TA value used for the SDT is valid is based on the location information of the terminal device, including: for the SDT using the configured grant resource allocation method, when the location information of the terminal device meets a first preset condition, determining that the TA (Timing Advance) value used for the SDT is valid.

[0010] In this technical solution, the location change factor of the terminal device is taken into account when judging whether the TA value is valid, so that the terminal device can use the valid TA value for time alignment, thereby ensuring the time synchronization of the network side device, correctly decoding the uplink data, and avoiding interference within the cell.

[0011] In a possible implementation, judging whether the timing advance TA value used for the SDT is valid based on the location information of the terminal device includes: for the SDT using the configured grant resource allocation method, determining that the TA value used for the SDT is valid when the location information of the terminal device satisfies a first preset condition and the reference signal received power RSRP change information satisfies a first change condition.

[0012] In this technical solution, the validity of the TA value is determined by combining the location change factor of the terminal device and the RSRP (Reference Signal Receiving Power) change, so that the terminal device can use the valid TA value for time alignment, which can ensure the time synchronization of the network side equipment, correctly decode the uplink data, and avoid interference within the cell.

[0013] Optionally, the location information of the terminal device satisfies the first preset condition and includes at least any one of the following: the distance from the terminal device to the network side device increases by a first distance threshold relative to the distance from the terminal device to the network side device last acquired or recorded; the distance from the terminal device to the network side device decreases by the first distance threshold relative to the distance from the terminal device to the network side device last acquired or recorded; the round-trip time RTT between the terminal device and the network side device increases by a first time threshold relative to the RTT between the terminal device and the network side device last acquired or recorded; the round-trip time RTT between the terminal device and the network side device decreases by the first time threshold relative to the RTT between the terminal device and the network side device last acquired or recorded; the TA value estimated by the terminal device increases by a first threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by the first threshold relative to the currently used TA value.

[0014] Optionally, the RSRP change information satisfies a first change condition, including: an absolute value of a difference between a currently measured downlink path loss reference RSRP value and a stored downlink path loss reference RSRP value is less than a first threshold value.

[0015] In one implementation, the determining of the SDT transmission condition according to the location information of the terminal device includes: determining whether to initiate a small data transmission SDT according to the location information of the terminal device.

[0016] In a possible implementation, determining whether to initiate a small data transmission SDT based on the location information of the terminal device includes: determining whether the location information of the terminal device satisfies a second preset condition; and initiating the SDT in response to the location information of the terminal device satisfying the second preset condition.

[0017] In this technical solution, whether SDT can be initiated can be determined based on the location information of the terminal device, so that the NTN network can support SDT.

[0018] In a possible implementation, the determining whether to initiate a small data transmission SDT based on the location information of the terminal device includes: determining whether the location information of the terminal device satisfies a second preset condition; determining whether the RSRP change information satisfies a second change condition; in response to the location information of the terminal device satisfying the second preset condition and the RSRP change information satisfying the second change condition, initiating the SDT.

[0019] In this technical solution, by combining the location change factor of the terminal device and the RSRP change to determine whether SDT can be initiated, the NTN network can support SDT, so that the NTN network cell can cover the near-far effect of signal quality and avoid interference within the cell.

[0020] Optionally, the location information of the terminal device satisfies the second preset condition and includes at least any one of the following: the distance from the terminal device to the network side device is less than a second distance threshold; the RTT between the terminal device and the network side device is less than a second time threshold; the TA value estimated by the terminal device is increased by a second threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the second threshold relative to the currently used TA value.

[0021] Optionally, the RSRP change information satisfies the second change condition, including: a currently measured downlink path loss reference RSRP value is greater than a second threshold value.

[0022] In one implementation, the determination of the SDT transmission condition based on the location information of the terminal device includes: determining, based on the location information of the terminal device, whether it is message 3 Msg3 of the four-step random access process for initiating the initial access of the SDT, or message A MsgA of the two-step random access process for initiating the initial access of the SDT.

[0023] In a possible implementation, the determination, based on the location information of the terminal device, whether to initiate message 3 Msg3 of the four-step random access process for the initial access of the SDT or message A MsgA of the two-step random access process for the initial access of the SDT includes: determining whether the location information of the terminal device satisfies a third preset condition; in response to the location information of the terminal device satisfying the third preset condition, initiating MsgA of the two-step random access process for the initial access of the SDT; in response to the location information of the terminal device not satisfying the third preset condition, initiating Msg3 of the four-step random access process for the initial access of the SDT.

[0024] In this technical solution, whether to initiate the Msg3 of the four-step random access process of the initial access of SDT or the MsgA of the two-step random access process of the initial access of SDT is determined according to the location information of the terminal device, so that the NTN network can support SDT.

[0025] In an optional implementation, the determination, based on the location information of the terminal device, whether to initiate message 3 Msg3 of the four-step random access process for the initial access of the SDT or message A MsgA of the two-step random access process for the initial access of the SDT includes: determining whether the location information of the terminal device satisfies a third preset condition; determining whether the RSRP change information satisfies a third change condition; in response to the location information of the terminal device satisfying the third preset condition and the RSRP change information satisfying the third change condition, initiating MsgA of the two-step random access process for the initial access of the SDT; in response to the location information of the terminal device not satisfying the third preset condition, and / or the RSRP change information not satisfying the third change condition, initiating Msg3 of the four-step random access process for the initial access of the SDT.

[0026] Optionally, the location information of the terminal device satisfies the third preset condition and includes at least any one of the following: the distance from the terminal device to the network side device is less than a third distance threshold; the RTT between the terminal device and the network side device is less than a third time threshold; the TA value estimated by the terminal device increases by a third threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by a third threshold relative to the currently used TA value; the RSRP change information satisfies the third change condition and includes: the currently measured downlink path loss reference RSRP value is greater than a third threshold value.

[0027] In this technical solution, by combining the location change factor of the terminal device and the RSRP change to determine whether to initiate the Msg3 of the four-step random access process of the initial access of SDT or the MsgA of the two-step random access process of the initial access of SDT, the NTN network can support SDT, so that the NTN network cell can cover the far-near effect of signal quality and avoid interference within the cell.

[0028] In one implementation, the determining of the SDT transmission condition based on the location information of the terminal device includes: determining whether to initiate the SDT on a supplementary uplink SUL or a normal uplink NUL based on the location information of the terminal device.

[0029] In one possible implementation, determining whether to initiate the SDT on a supplementary uplink SUL or a normal uplink NUL based on the location information of the terminal device includes: determining whether the location information of the terminal device satisfies a fourth preset condition; in response to the location information of the terminal device satisfying the fourth preset condition, initiating the SDT on the SUL; in response to the location information of the terminal device not satisfying the fourth preset condition, initiating the SDT on the NUL.

[0030] In this technical solution, whether to initiate SDT on SUL or NUL is determined based on the location information of the terminal device, that is, the location information is considered when determining whether to initiate SDT on SUL or NUL, so that the NTN network can support SDT.

[0031] Optionally, the location information of the terminal device satisfies the fourth preset condition and includes at least any one of the following: the distance from the terminal device to the network side device is greater than a fourth distance threshold; the RTT between the terminal device and the network side device is greater than a fourth time threshold; the TA value estimated by the terminal device is increased by a fourth threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the fourth threshold relative to the currently used TA value.

[0032] In a possible implementation, the determining whether to initiate the SDT on the supplementary uplink SUL or the normal uplink NUL based on the location information of the terminal device includes: determining whether the location information of the terminal device satisfies a fifth preset condition; determining whether the RSRP change information satisfies a fourth change condition; in response to the location information of the terminal device satisfying the fifth preset condition and the RSRP change information satisfying the fourth change condition, initiating the SDT on the NUL; in response to the location information of the terminal device not satisfying the fifth preset condition, and / or the RSRP change information not satisfying the fourth change condition, initiating the SDT on the SUL; wherein the location information of the terminal device satisfying the fifth preset condition includes at least any one of the following: the distance from the terminal device to the network side device is less than a fifth distance threshold; the RTT between the terminal device and the network side device is less than a fifth time threshold; the RSRP change information satisfying the fourth change condition includes: the currently measured downlink path loss reference RSRP value is greater than a fourth threshold value.

[0033] In this technical solution, by combining the location change factor and RSRP change of the terminal device to determine whether to initiate SDT on SUL or NUL, that is, considering the location change factor and RSRP change of the terminal device when determining whether to initiate SDT on SUL or NUL, the NTN network can support SDT, so that the NTN network cell can cover the far and near effects of signal quality and avoid interference within the cell.

[0034] In a possible implementation, the determining whether to initiate the SDT on the supplementary uplink SUL or the normal uplink NUL based on the location information of the terminal device includes: determining whether the location information of the terminal device satisfies a sixth preset condition; determining whether the RSRP change information satisfies a fifth change condition; in response to the location information of the terminal device satisfying the sixth preset condition and the RSRP change information satisfying the fifth change condition, initiating the SDT on the SUL; in response to the location information of the terminal device not satisfying the sixth preset condition, and / or the RSRP change information not satisfying the fifth change condition, initiating the SDT on the NUL; wherein the location information of the terminal device satisfying the sixth preset condition includes at least any one of the following: the distance from the terminal device to the network side device is greater than a sixth distance threshold; the RTT between the terminal device and the network side device is greater than a sixth time threshold; the RSRP change information satisfying the fifth change condition includes: the currently measured downlink path loss reference RSRP value is less than the fifth threshold value.

[0035] In this technical solution, by combining the location change factor and RSRP change of the terminal device to determine whether to initiate SDT on SUL or NUL, that is, considering the location change factor and RSRP change of the terminal device when determining whether to initiate SDT on SUL or NUL, the NTN network can support SDT, so that the NTN network cell can cover the far and near effects of signal quality and avoid interference within the cell.

[0036] In one implementation, the determining of the SDT transmission condition based on the location information of the terminal device includes: determining, based on the location information of the terminal device, whether a time alignment timer TAT has timed out.

[0037] In a possible implementation, determining whether the time alignment timer TAT has timed out is performed based on the location information of the terminal device, including: determining whether the location information of the terminal device satisfies a seventh preset condition; and determining that the TAT has timed out in response to the location information of the terminal device satisfying the seventh preset condition.

[0038] Optionally, the location information of the terminal device satisfies the seventh preset condition and includes at least any one of the following: the distance from the terminal device to the network side device is greater than the seventh distance threshold; the RTT between the terminal device and the network side device is greater than the seventh time threshold; the TA value estimated by the terminal device is increased by the fifth threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the fifth threshold relative to the currently used TA value.

[0039] In this technical solution, TAT timeout is determined based on the location information of the terminal device, that is, the location information of the terminal device is considered when determining TAT timeout, so that the terminal device can perform link exception processing when determining TAT timeout, thereby improving the NTN system communication process and ensuring the normal operation of the NTN system communication, so that the NTN network can support SDT.

[0040] In one implementation, the method further includes: when the timer is started after transmission on a dedicated physical uplink shared channel PUSCH resource configured by the network, performing enhanced processing on the timer.

[0041] In an optional implementation, the enhanced processing of the timer includes: offsetting the start time of the timer by the RTT between the terminal device and the base station; or increasing the value of the timer by the RTT between the terminal device and the base station.

[0042] Optionally, the timer is any one of the following: a configuration authorization timer of the SDT; a configuration authorization retransmission timer of the SDT; a preset timer, wherein the preset timer is used to indicate that the terminal device automatically retransmits after the preset timer expires, or waits for feedback from the base station during the operation of the preset timer.

[0043] Optionally, the preset timer is a dedicated physical uplink shared channel PUSCH resource configured by the network.

[0044] In this technical solution, when the timer is started after transmission on the dedicated physical uplink shared channel PUSCH resource (or CGSDT) configured by the network, the timer is enhanced so that the timer start time is offset by the RTT between the terminal device and the base station or the timer value is increased by one RTT, so that the timer can adapt to the NTN network, thereby improving the NTN system communication process and ensuring the normal operation of the NTN system communication, so that the NTN network can support SDT.

[0045] In a second aspect, an embodiment of the present disclosure provides an SDT processing method for a non-terrestrial network, the method being executed by a network side device, the method comprising: receiving an SDT random access request sent by a terminal device; wherein the SDT random access request carries a small data transmission indication, and the small data transmission indication is used to inform the network side device that wireless access signaling will be used to carry small data packets; in response to the SDT random access request, sending a random access response to the terminal device; the random access response carries uplink configuration authorization resources and threshold configuration information allocated to the terminal device, wherein the threshold configuration information is used by the terminal device as a basis for judging the SDT transmission condition when judging the SDT transmission condition based on the location information of the terminal device.

[0046] In a third aspect, an embodiment of the present disclosure provides a communication device, which has some or all of the functions of the terminal device in the method described in the first aspect above, such as the functions of the communication device can have the functions of some or all of the embodiments in the present disclosure, or can have the functions of any embodiment in a separate embodiment of the present disclosure. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0047] In one implementation, the structure of the communication device may include a transceiver module and a processing module, and the processing module is configured to support the communication device to perform the corresponding functions in the above method. The transceiver module is used to support communication between the communication device and other devices. The communication device may also include a storage module, which is used to couple with the transceiver module and the processing module, and store the computer programs and data necessary for the communication device.

[0048] As an example, the processing module may be a processor, the transceiver module may be a transceiver or a communication interface, and the storage module may be a memory.

[0049] In a fourth aspect, an embodiment of the present disclosure provides another communication device, which has some or all of the functions of the network side device in the method described in the second aspect above, such as the functions of the communication device can have the functions of some or all of the embodiments in the present disclosure, or can have the functions of any embodiment in a separate embodiment of the present disclosure. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0050] In one implementation, the structure of the communication device may include a transceiver module and a processing module, and the processing module is configured to support the communication device to perform the corresponding functions in the above method. The transceiver module is used to support communication between the communication device and other devices. The communication device may also include a storage module, which is used to couple with the transceiver module and the processing module, and store the computer programs and data necessary for the communication device.

[0051] As an example, the processing module may be a processor, the transceiver module may be a transceiver or a communication interface, and the storage module may be a memory.

[0052] In a fifth aspect, an embodiment of the present disclosure provides another communication device, which includes a processor. When the processor calls a computer program in a memory, the method described in the first aspect is executed.

[0053] In a sixth aspect, an embodiment of the present disclosure provides another communication device, which includes a processor. When the processor calls a computer program in a memory, the method described in the second aspect is executed.

[0054] In the seventh aspect, an embodiment of the present disclosure provides another communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the first aspect above.

[0055] In an eighth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and a memory, in which a computer program is stored; the processor executes the computer program stored in the memory so that the communication device executes the method described in the second aspect above.

[0056] In a ninth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, wherein the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the communication device to execute the method described in the first aspect above.

[0057] In the tenth aspect, an embodiment of the present disclosure provides a communication device, which includes a processor and an interface circuit, the interface circuit is used to receive code instructions and transmit them to the processor, and the processor is used to run the code instructions to enable the communication device to execute the method described in the second aspect above.

[0058] In the eleventh aspect, an embodiment of the present disclosure provides a communication system, the system comprising the communication device described in the third aspect and the communication device described in the fourth aspect, or the system comprising the communication device described in the fifth aspect and the communication device described in the sixth aspect, or the system comprising the communication device described in the seventh aspect and the communication device described in the eighth aspect, or the system comprising the communication device described in the ninth aspect and the communication device described in the tenth aspect.

[0059] In a twelfth aspect, an embodiment of the present disclosure provides a computer-readable storage medium for storing instructions used by the above-mentioned communication device, and when the instructions are executed, the communication device executes the method described in the first aspect.

[0060] In a thirteenth aspect, an embodiment of the present disclosure provides a computer-readable storage medium for storing instructions used by the above-mentioned communication device, and when the instructions are executed, the communication device executes the method described in the above-mentioned second aspect.

[0061] In a fourteenth aspect, the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect above.

[0062] In a fifteenth aspect, the present disclosure further provides a computer program product comprising a computer program, which, when executed on a computer, enables the computer to execute the method described in the second aspect above.

[0063] In a sixteenth aspect, the present disclosure provides a computer program, which, when executed on a computer, enables the computer to execute the method described in the first aspect.

[0064] In a seventeenth aspect, the present disclosure provides a computer program, which, when executed on a computer, enables the computer to execute the method described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the background technology, the drawings required for use in the embodiments of the present disclosure or the background technology will be described below.

[0066] Figure 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present disclosure;

[0067] Figure 2 An example of how a satellite processes a signal in an NTN network according to an embodiment of the present disclosure Figure 1 ;

[0068] Figure 3 An example of how a satellite processes a signal in an NTN network according to an embodiment of the present disclosure Figure 2 ;

[0069] Figure 4a This is an example diagram of the SDT process;

[0070] Figure 4b This is an example diagram of the CG-SDT process;

[0071] Figure 5 is a flow chart of an SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure;

[0072] Figure 6 is a flow chart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure;

[0073] Figure 7 is a flow chart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure;

[0074] Figure 8 is a flowchart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure;

[0075] Fig. 9 is a flow chart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure;

[0076] Fig.10 is a flow chart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure;

[0077] Fig.11 is a flow chart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure;

[0078] Fig.12 A schematic diagram of the structure of a communication device provided in an embodiment of the present disclosure;

[0079] Fig.13 It is a structural diagram of a communication device 1200 provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0080] The embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limitations on the present disclosure. In the description of the present disclosure, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0081] In order to better understand the SDT processing method for a non-terrestrial network disclosed in an embodiment of the present disclosure, the communication system used in the embodiment of the present disclosure is first described below.

[0082] See also Figure 1 , Figure 1 The present invention provides a schematic diagram of the architecture of a communication system. The communication system may include but is not limited to a base station, a satellite, a ground station and a terminal device. Figure 1 The number and form of the devices shown are for illustrative purposes only and do not constitute a limitation on the embodiments of the present disclosure. In actual applications, two or more base stations, satellites, ground stations, and terminal devices may be included. Figure 1 The communication system shown may include a base station 110, a satellite 120, a ground station 130 and a terminal device 140 as an example.

[0083] The terminal device 140 in the embodiment of the present disclosure is an entity on the user side for receiving or transmitting signals, such as a mobile phone. The terminal device may also be referred to as a terminal device (terminal), user equipment (UE), mobile station (MS), mobile terminal device (MT), etc. The terminal device may be a car with communication function, a smart car, a mobile phone, a wearable device, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control (industrial control), a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in smart grid (smart grid), a wireless terminal device in transportation safety (transportation safety), a wireless terminal device in smart city (smart city), a wireless terminal device in smart home (smart home), etc. The embodiment of the present disclosure does not limit the specific technology and specific device form adopted by the terminal device.

[0084] It should be noted that the technical solution of the embodiment of the present disclosure can be applied to the NTN communication system. NTN is an important technology introduced by 5G. It provides wireless resources through satellites (or drones) instead of ground base stations. According to the different ways in which satellites process signals, it can be divided into transparent transmission mode and regeneration mode. Figure 2 As shown in the figure, the NTN ground station sends the gNB (base station) signal to the satellite, and the satellite converts the signal to the satellite frequency band and then sends it to the terminal device UE through the satellite frequency band. In addition to frequency conversion and signal amplification, the satellite does not demodulate the gNB signal, which is similar to a repeater. Figure 3 As shown in the figure, after the NTN ground station sends the gNB signal to the satellite, the satellite first demodulates and decodes the signal and then re-encodes and modulates it (this process is called regeneration) and sends the regenerated signal through the satellite frequency band.

[0085] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. A person skilled in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.

[0086] The SDT processing method, communication device and storage medium for non-terrestrial networks provided by the present disclosure are described in detail below in conjunction with the accompanying drawings.

[0087] First, the technical background involved in this disclosure is introduced.

[0088] Uplink Configuration Grant, in contrast to uplink dynamic scheduling, refers to a resource allocation method in which the resources are pre-configured periodically repeated uplink resources. After being configured to the UE once, the corresponding uplink resources do not need to be indicated to the UE again at each subsequent periodic moment, and the UE can use them directly. Similarly, downlink semi-persistent scheduling (SPS) is similar to uplink Configured Grant, except that it is used for downlink resources.

[0089] For the uplink Configured Grant, each time the UE sends a new uplink data transmission on a HARQ (Hybrid Automatic RepeatRequest) process, the Configured Grant Timer corresponding to the HARQ process will be started. During the operation of the Timer, no other new transmissions can be scheduled on the HARQ process. The CG-RetransmissionTimer can be configured Per Configured Grant for uplink automatic retransmission. Each time the UE sends a new uplink transmission or retransmission on a HARQ process, the CG-RetransmissionTimer corresponding to the HARQ process will be started. During the operation of the timer, no uplink automatic retransmission will be performed. After the timer stops running, the uplink automatic retransmission will be started. Currently, the CG-RetransmissionTimer can only be used when the UE selects the HARQ ID corresponding to the Configured Grant by itself.

[0090] For DRX (Discontinuous Reception), the uplink discontinuous reception hybrid automatic repeat request round trip timer (drx-HARQ-RTT-TimerUL) represents the minimum time interval that the UE can receive for uplink retransmission scheduling after uplink transmission. It is started every time the UE sends uplink data, and after the timer ends, the uplink discontinuous reception retransmission timer (drx-RetransmissionTimerUL) is started. During the operation of the drx-RetransmissionTimerUL timer, the UE monitors the dynamic scheduling of uplink retransmission by the base station. Similarly, the downlink discontinuous reception hybrid automatic repeat request round trip timer (drx-HARQ-RTT-TimerDL) timer represents the minimum time interval that the UE can receive for downlink retransmission scheduling after sending uplink feedback of downlink data. It is started every time the UE sends uplink HARQ feedback of downlink data, and after the timer ends, the downlink discontinuous reception retransmission timer (drx-RetransmissionTimerDL) is started. While the drx-RetransmissionTimerDL timer is running, the UE monitors the dynamic scheduling of downlink retransmission by the base station.

[0091] NTN is currently studying the feedback function of Enable / disable HARQ. If the feedback function of HARQ is disabled, the sender will not provide HARQ feedback after sending the data. At the same time, NTN is also studying the blind retransmission function for HARQ with feedback function disabled. If it is enabled, the sender will automatically perform one or more blind retransmissions on the data.

[0092] Introduction to SDT (Small Data Transmission): According to the resources configured on the network side, when the UE is in IDLE or INACTIVE state, it can send data directly to the network side device through the following methods:

[0093] 1) Msg3 of the four-step random access process for initial access (or called 4-step RACH SDT);

[0094] 2) MsgA of the two-step random access process for initial access (also called 2-step RACH SDT);

[0095] 3) Dedicated uplink PUSCH (Physical Uplink Shared Channel) resources configured by the network (ie, CG (Configure Grant) or PUR (Preallocated Uplink Resource); or CG SDT.

[0096] like Figure 4a As shown, the SDT process may include an initial data transmission phase and a subsequent data transmission phase. The initial data transmission phase: starts from triggering the initial data transmission of SDT to receiving confirmation information from the network side for the initial data. The confirmation information may be different in the following three ways compared to different SDT processes: (1) 4-step RACH SDT: the confirmation information is a contention resolution identifier for successfully receiving Msg4; (2) 2-step RACH SDT: the confirmation information is a contention resolution identifier for successfully receiving MsgB; (3) CG SDT: the confirmation information is an indication of successful data reception sent by the network (e.g., ACK (positive acknowledgement) information indicated by the physical layer DCI (Downlink Control Information)). The subsequent data transmission phase: starts from receiving confirmation information from the network side for the initial data to receiving a connection release message sent by the network. At this stage, the UE can send and receive uplink and downlink data.

[0097] like Figure 4b As shown, for the CG-SDT resources configured by the network, after the UE uses the CG resources to send data, it will start a feedback timer (such as feedbackTimer) to listen to the feedback information on the network side. If the UE does not receive a successful reception confirmation from the network side during the operation of the feedback timer, the UE will retransmit the data on the subsequent CG resources. For the uplink Configured Grant, each time the UE sends a new uplink data transmission on a HARQ process, the configured authorization timer corresponding to the HARQ process will be started. During the operation of this timer, no other new transmissions can be scheduled on the HARQ process. The configured authorization retransmission timer (CG-RetransmissionTimer) can be configured Per Configured Grant for uplink automatic retransmission. Each time the UE sends a new uplink transmission or retransmission on a HARQ process, the CG-RetransmissionTimer corresponding to the HARQ process will be started. During the operation of this timer, no uplink automatic retransmission will be performed. After the timer stops running, the uplink automatic retransmission is started.

[0098] However, the current SDT solution is mainly designed for TN networks. If SDT is applied to NTN networks, due to the near-far effect of the signal quality of NTN network cell coverage (the signal quality does not change significantly with the distance from the cell center), when the signal quality is used as the decision condition, it is necessary to optimize the location change. In addition, since the RTT (round-trip time) of the NTN network is very long, and some SDT timers need to take into account the feedback delay, the timers need to be enhanced.

[0099] Therefore, in order to enable the NTN network to support the SDT technology, the present disclosure proposes an SDT processing method for non-terrestrial networks, by considering the location information of the terminal device when applying SDT in the NTN, so that the NTN network can support SDT processing based on the location information of the terminal device. Figure 5 , Figure 5 1 is a flow chart of an SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure. It should be noted that the SDT processing method for a non-terrestrial network in an embodiment of the present disclosure can be applied to a terminal device. Figure 5 As shown, the SDT processing method for the non-terrestrial network may include but is not limited to the following steps.

[0100] Step 501, determine the location information of the terminal device.

[0101] In one implementation, the terminal device may determine its own location information through its own positioning system; or the terminal device may also determine its own location information in other ways. As an example, the terminal device may determine its own location information based on a signal quality parameter. The present disclosure does not specifically limit the method for determining the location information of the terminal device.

[0102] In an optional implementation, the location information in the embodiments of the present disclosure may be understood as the distance of the terminal device from the center of the NTN network cell (such as from the network side device); or, the location information in the embodiments of the present disclosure may also be understood as geographic location information composed of the longitude and latitude coordinates of the earth. The specific content and form of expression of the location information may be determined according to actual applications, and the present disclosure does not make specific limitations on this.

[0103] Step 502, determining the SDT transmission condition based on the location information of the terminal device.

[0104] Among them, in the embodiment of the present disclosure, the judgment of the SDT transmission condition includes at least one or more of the following: judging whether the timing advance TA value used for SDT is valid; judging whether to initiate a small data transmission SDT; judging whether it is message 3 Msg3 of the four-step random access process for initial access of SDT, or message A MsgA of the two-step random access process for initial access of SDT; judging whether to initiate SDT on the supplementary uplink SUL or the normal uplink NUL; judging whether the time alignment timer TAT times out.

[0105] In some embodiments according to the present disclosure, step 502 may include: judging whether the timing advance TA value used for SDT is valid according to the location information of the terminal device; or judging whether to initiate a small data transmission SDT according to the location information of the terminal device; or judging whether to initiate message 3 Msg3 of the four-step random access process for initial access of SDT or message A MsgA of the two-step random access process for initial access of SDT according to the location information of the terminal device; or judging whether to initiate SDT on the supplementary uplink SUL or on the normal uplink NUL according to the location information of the terminal device; or judging whether the time alignment timer TAT has expired according to the location information of the terminal device.

[0106] Optionally, after determining its own location information, the terminal device may perform one or more of the following actions based on its own location information: determine whether the timing advance TA value used for SDT is valid; determine whether to initiate small data transmission SDT; determine whether it is message 3 Msg3 of the four-step random access process for initial access of SDT, or message A MsgA of the two-step random access process for initial access of SDT; determine whether to initiate SDT on the supplementary uplink SUL or the normal uplink NUL; determine whether the time alignment timer TAT has expired.

[0107] That is to say, after determining the location information of the terminal device, the terminal device can determine whether the TA value is valid based on its own location information; and / or, the terminal device can determine whether to initiate a small data transmission SDT based on its own location information; and / or, the terminal device can determine whether to initiate Msg3 of the four-step random access process for initial access of SDT, or MsgA of the two-step random access process for initial access of SDT based on its own location information; and / or, the terminal device can determine whether to initiate SDT on SUL (Supplement UL Link) or on the normal uplink NUL based on its own location information; and / or, the terminal device can determine whether the time alignment timer TAT has expired based on its own location information.

[0108] By implementing the embodiments of the present disclosure, location information may be considered when applying the SDT technology in the NTN network, thereby enabling the NTN network to support SDT.

[0109] It is worth noting that due to the distance effect of the signal quality of the NTN network cell coverage (the signal quality does not change significantly with the distance from the cell center), in order to enable the NTN network to support SDT, the location change of the terminal device needs to be given priority when the signal quality is used as the decision condition, that is, the location information of the terminal device needs to be considered when applying SDT in the NTN network. The following will introduce in conjunction with the attached figure where the location change factor of the terminal device needs to be considered in the process of applying SDT in the TN network.

[0110] See also Figure 6 , Figure 6 FIG. 1 is a flowchart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure. It should be noted that the SDT processing method for a non-terrestrial network in an embodiment of the present disclosure can be applied to a terminal device. Figure 6 As shown, the SDT processing method for the non-terrestrial network may include but is not limited to the following steps.

[0111] Step 601, determine the location information of the terminal device.

[0112] In the embodiments of the present disclosure, step 601 may be implemented in any manner in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0113] Step 602: Determine whether the timing advance TA value used for SDT is valid based on the location information of the terminal device.

[0114] In some embodiments according to the present disclosure, for SDT using a configured grant resource allocation method, when the location information of the terminal device meets a first preset condition, it is determined that the TA value used for the SDT is valid.

[0115] It can be understood that uplink grant-free (non-dynamic scheduling) means that the gNB activates an uplink grant to the terminal device UE. If the UE does not receive deactivation, it will always use the resources specified by the first uplink grant for uplink transmission. There are two types of transmission:

[0116] Configuration grant type 1: configured by RRC (Radio Resource Control) through high-level signaling (IE ConfiguredGrantConfig);

[0117] Configuration grant type 2: The activation and deactivation of uplink grant-free is indicated by DCI. The required parameters are configured by IEConfiguredGrantConfig, but it is used only when activated by DCI.

[0118] Configuration grant type 1 and type 2 are distinguished based on the rrc-ConfiguredUplinkGrant field in IE ConfiguredGrantConfig. If this field is configured, it is configuration grant type 1. If this field is not configured, it is configuration grant type 2.

[0119] Optionally, in some embodiments according to the present disclosure, the configured grant may be a configured grant type 1. That is, for SDT using the configured grant type 1 resource allocation method, when the location information of the terminal device meets the first preset condition, it is determined that the TA value used for the SDT is valid.

[0120] In one implementation, the location information of the terminal device satisfies the first preset condition, including at least one of the following:

[0121] The distance between the terminal device and the network side device increases by a first distance threshold relative to the distance between the terminal device and the network side device last obtained or recorded; the distance between the terminal device and the network side device decreases by a first distance threshold relative to the distance between the terminal device and the network side device last obtained or recorded; the round-trip time RTT between the terminal device and the network side device increases by a first time threshold relative to the RTT between the terminal device and the network side device last obtained or recorded; the round-trip time RTT between the terminal device and the network side device decreases by a first time threshold relative to the RTT between the terminal device and the network side device last obtained or recorded; the TA value estimated by the terminal device increases by a first threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by a first threshold relative to the currently used TA value. Among them, the first distance threshold and the first time threshold can be configured Per CG (per configuration authorization).

[0122] Optionally, in an embodiment of the present disclosure, the terminal device obtains or records the distance or RTT from the terminal device to the network side device when receiving a TA command from the network side; the last time the distance or RTT was obtained or recorded was the distance or RTT obtained or recorded when the terminal device last received a TA command.

[0123] For example, assuming that the terminal device obtains or records the distance from the terminal device to the network side device when receiving the TA command, the currently obtained or recorded distance from the terminal device to the network side device is compared with the distance from the terminal device to the network side device last obtained or recorded. If the currently obtained or recorded distance from the terminal device to the network side device increases or decreases by a first distance threshold relative to the distance from the terminal device to the network side device last obtained or recorded, the location information of the terminal device is considered to meet the first preset condition. For another example, assuming that the terminal device obtains or records the RTT from the terminal device to the network side device when receiving the TA command, the currently obtained or recorded RTT from the terminal device to the network side device is compared with the RTT from the terminal device to the network side device last obtained or recorded. If the currently obtained or recorded RTT from the terminal device to the network side device increases or decreases by a first time threshold relative to the RTT from the terminal device to the network side device last obtained or recorded, the location information of the terminal device is considered to meet the first preset condition.

[0124] Among them, the network side equipment may include any one of the following: a satellite, a ground reference point, a base station, and a reference point between a satellite and a base station.

[0125] That is to say, when the location information of the terminal device is within a certain range, the location information of the terminal device can be considered to meet the first preset condition. For example, if the distance from the terminal device to the satellite increases or decreases by a first distance threshold relative to the distance from the terminal device to the satellite last acquired or recorded, the location information of the terminal device is considered to meet the first preset condition; or, if the distance from the terminal device to the ground reference point increases or decreases by a first distance threshold relative to the distance from the terminal device to the ground reference point last acquired or recorded, the location information of the terminal device is considered to meet the first preset condition; or, if the distance from the terminal device to the base station gNB increases or decreases by a first distance threshold relative to the distance from the terminal device to the base station last acquired or recorded, the location information of the terminal device is considered to meet the first preset condition; or, if the distance from the terminal device to the reference point between the satellite and the base station increases or decreases by a first distance threshold relative to the distance from the terminal device to the reference point between the satellite and the base station last acquired or recorded, the location information of the terminal device is considered to meet the first preset condition.

[0126] For another example, if the RTT from the terminal device to the satellite increases or decreases by a first time threshold relative to the last acquired or recorded RTT from the terminal device to the satellite, the location information of the terminal device is considered to meet the first preset condition; or, if the RTT from the terminal device to the ground reference point increases or decreases by a first time threshold relative to the last acquired or recorded RTT from the terminal device to the ground reference point, the location information of the terminal device is considered to meet the first preset condition; or, if the RTT from the terminal device to the base station gNB increases or decreases by a first time threshold relative to the last acquired or recorded RTT from the terminal device to the base station, the location information of the terminal device is considered to meet the first preset condition; or, if the RTT from the terminal device to the reference point between the satellite and the base station increases or decreases by a first time threshold relative to the last acquired or recorded RTT from the terminal device to the reference point between the satellite and the base station, the location information of the terminal device is considered to meet the first preset condition.

[0127] In some embodiments, the terminal device may also estimate the TA value periodically or irregularly, and use the difference between the estimated TA value and the currently used TA value to determine whether the location change of the terminal device is within a certain range. As an example, the terminal device estimates the TA value periodically or irregularly, and determines that the estimated TA value increases or decreases by a certain threshold relative to the currently used TA value, and then considers that the location information of the terminal device meets the first preset condition.

[0128] By implementing the embodiments of the present disclosure, the location change factor of the terminal device is taken into account when determining whether the TA value is valid, so that the terminal device can use the valid TA value for time alignment, thereby ensuring the time synchronization of the network side device, correctly decoding the uplink data, and avoiding interference within the cell.

[0129] In some embodiments according to the present disclosure, the location change and RSRP (Reference Signal Receiving Power) change can also be used in combination, and the TA value is considered valid only when both conditions are met. As an example, for SDT using the Configured Grant resource allocation method, when the location information of the terminal device meets the first preset condition and the reference signal receiving power RSRP change information meets the first change condition, it is determined that the TA value used for SDT is valid.

[0130] Among them, the implementation method of ensuring that the location information of the terminal device meets the first preset condition can be found in the description of the above embodiment and will not be repeated here.

[0131] In the embodiment of the present disclosure, RSRP change information satisfying the first change condition may include that the absolute value of the difference between the currently measured downlink path loss reference RSRP value and the stored downlink path loss reference RSRP value is less than the first threshold value. For example, the RSRP change condition (i.e., the above-mentioned first change condition) may be that the value of the downlink path loss reference RSRP (RSRP of the downlinkpathloss reference) relative to the stored downlink path loss reference RSRP value changes by an increase / decrease less than a certain threshold (sdt-CG-RSRP-ChangeThresholdIncrease / CG-RSRP-ChangeThresholdDecrease), wherein sdt-CG-RSRP-ChangeThresholdIncrease may be understood as an increase in the sdt-CG-RSRP change threshold, and CG-RSRP-ChangeThresholdDecrease may be understood as a decrease in the CG-RSRP change threshold.

[0132] By implementing the embodiments of the present disclosure, the validity of the TA value is determined by combining the location change factor of the terminal device and the RSRP (Reference Signal Receiving Power) change, so that the terminal device can use the valid TA value for time alignment, thereby ensuring the time synchronization of the network side device, correctly decoding the uplink data, and avoiding interference within the cell.

[0133] See also Figure 7 , Figure 7 FIG. 1 is a flowchart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure. It should be noted that the SDT processing method for a non-terrestrial network in an embodiment of the present disclosure can be applied to a terminal device. Figure 7 As shown, the SDT processing method for the non-terrestrial network may include but is not limited to the following steps.

[0134] Step 701, determine the location information of the terminal device.

[0135] In the embodiments of the present disclosure, step 701 may be implemented in any manner in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0136] Step 702: determine whether to initiate a small data transmission SDT according to the location information of the terminal device.

[0137] In some embodiments according to the present disclosure, it can be determined whether the location information of the terminal device satisfies a second preset condition, and in response to the location information of the terminal device satisfying the second preset condition, SDT is initiated.

[0138] In one implementation, the location information of the terminal device satisfies the second preset condition, including at least one of the following: the distance from the terminal device to the network side device is less than the second distance threshold; the RTT between the terminal device and the network side device is less than the second time threshold; the TA value estimated by the terminal device is increased by the second threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the second threshold relative to the currently used TA value.

[0139] Among them, the network side equipment may include any one of the following: a satellite, a ground reference point, a base station, and a reference point between a satellite and a base station.

[0140] That is to say, when the terminal device can determine whether its location information meets certain conditions, it can be achieved in the following ways: when the distance from the terminal device to the satellite is less than the second distance threshold, the location information of the terminal device is considered to meet the second preset condition; or, when the distance from the terminal device to the ground reference point is less than the second distance threshold, the location information of the terminal device is considered to meet the second preset condition; or, when the distance from the terminal device to the base station gNB is less than the second distance threshold, the location information of the terminal device is considered to meet the second preset condition; or, when the distance from the terminal device to the reference point between the satellite and the base station is less than the second distance threshold, the location information of the terminal device is considered to meet the second preset condition.

[0141] For example, if the RTT from the terminal device to the satellite is less than the second time threshold, the location information of the terminal device is considered to meet the second preset condition; or, if the RTT from the terminal device to the ground reference point is less than the second time threshold, the location information of the terminal device is considered to meet the second preset condition; or, if the RTT from the terminal device to the base station gNB is less than the second time threshold, the location information of the terminal device is considered to meet the second preset condition; or, if the RTT from the terminal device to the reference point between the satellite and the base station is less than the second time threshold, the location information of the terminal device is considered to meet the second preset condition.

[0142] In some embodiments, the terminal device may also estimate the TA value periodically or irregularly, and use the difference between the estimated TA value and the currently used TA value to determine whether the location of the terminal device meets certain conditions. As an example, the terminal device estimates the TA value periodically or irregularly, and determines that the estimated TA value increases or decreases by a certain threshold relative to the currently used TA value, and then it is considered that the location information of the terminal device meets the second preset condition.

[0143] By implementing the embodiments of the present disclosure, it can be determined whether SDT can be initiated according to the location information of the terminal device, so that the NTN network can support SDT.

[0144] In some embodiments of the present disclosure, location information determination can be used in combination with RSRP, and SDT is initiated only when both the location condition and the RSRP threshold are met. As an example, it is determined whether the location information of the terminal device meets the second preset condition; it is determined whether the RSRP change information meets the second change condition; in response to the location information of the terminal device meeting the second preset condition and the RSRP change information meeting the second change condition, SDT is initiated.

[0145] Among them, the implementation method of ensuring that the location information of the terminal device meets the second preset condition can be found in the description of the above embodiment and will not be repeated here.

[0146] In the embodiment of the present disclosure, RSRP change information satisfying the second change condition may include: the value of the currently measured downlink path loss reference RSRP is greater than the second threshold value. For example, the RSRP change condition may be that the downlink path loss reference RSRP is greater than the threshold value sdt-RSRP-Threshold.

[0147] By implementing the embodiments of the present disclosure, by combining the location change factor of the terminal device and the RSRP change to determine whether SDT can be initiated, the NTN network can support SDT, so that the NTN network cell can cover the near-far effect of signal quality and avoid interference within the cell.

[0148] See also Figure 8 , Figure 8 FIG. 1 is a flowchart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure. It should be noted that the SDT processing method for a non-terrestrial network in an embodiment of the present disclosure can be applied to a terminal device. Figure 8 As shown, the SDT processing method for the non-terrestrial network may include but is not limited to the following steps.

[0149] Step 801, determine the location information of the terminal device.

[0150] In the embodiments of the present disclosure, step 801 may be implemented in any manner in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0151] Step 802: According to the location information of the terminal device, it is determined whether it is Msg3 of the four-step random access process for initiating the initial access of SDT or MsgA of the two-step random access process for initiating the initial access of SDT.

[0152] In some embodiments according to the present disclosure, it can be determined whether the location information of the terminal device satisfies a third preset condition. In response to the location information of the terminal device satisfying the third preset condition, MsgA of a two-step random access process for initial access of SDT is initiated (such as 2-step RA type for SDT); in response to the location information of the terminal device not satisfying the third preset condition, Msg3 of a four-step random access process for initial access of SDT is initiated (such as 4-step RA type for SDT).

[0153] In one implementation, the location information of the terminal device satisfies the third preset condition, which includes at least any one of the following:

[0154] The distance between the terminal device and the network side device is less than a third distance threshold; the RTT between the terminal device and the network side device is less than a third time threshold; the TA value estimated by the terminal device increases by a third threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by a third threshold relative to the currently used TA value. The network side device may include any one of the following: a satellite, a ground reference point, a base station, and a reference point between a satellite and a base station.

[0155] That is to say, when the terminal device can determine whether its location information meets certain conditions, it can be achieved in the following ways: when the distance from the terminal device to the satellite is less than the third distance threshold, the location information of the terminal device is considered to meet the third preset condition; or, when the distance from the terminal device to the ground reference point is less than the third distance threshold, the location information of the terminal device is considered to meet the third preset condition; or, when the distance from the terminal device to the base station gNB is less than the third distance threshold, the location information of the terminal device is considered to meet the third preset condition; or, when the distance from the terminal device to the reference point between the satellite and the base station is less than the third distance threshold, the location information of the terminal device is considered to meet the third preset condition.

[0156] For example, if the RTT from the terminal device to the satellite is less than the third time threshold, the location information of the terminal device is considered to meet the third preset condition; or, if the RTT from the terminal device to the ground reference point is less than the third time threshold, the location information of the terminal device is considered to meet the third preset condition; or, if the RTT from the terminal device to the base station gNB is less than the third time threshold, the location information of the terminal device is considered to meet the third preset condition; or, if the RTT from the terminal device to the reference point between the satellite and the base station is less than the third time threshold, the location information of the terminal device is considered to meet the third preset condition.

[0157] In some embodiments, the terminal device may also estimate the TA value periodically or irregularly, and use the difference between the estimated TA value and the currently used TA value to determine whether the location of the terminal device meets certain conditions. As an example, the terminal device estimates the TA value periodically or irregularly, and determines that the estimated TA value increases or decreases by a certain threshold relative to the currently used TA value, and then it is considered that the location information of the terminal device meets the third preset condition.

[0158] By implementing the embodiments of the present disclosure, it is possible to determine whether to initiate Msg3 of the four-step random access process of SDT initial access or MsgA of the two-step random access process of SDT initial access based on the location information of the terminal device, so that the NTN network can support SDT.

[0159] In some embodiments of the present disclosure, location information judgment can be used in combination with RSRP, and MsgA of the two-step random access process for initial access of SDT is initiated only when both the location condition and the RSRP threshold are met. As an example, it is judged whether the location information of the terminal device meets the third preset condition; it is judged whether the RSRP change information meets the third change condition; in response to the location information of the terminal device meeting the third preset condition and the RSRP change information meeting the third change condition, MsgA of the two-step random access process for initial access of SDT is initiated; in response to the location information of the terminal device not meeting the third preset condition, and / or the RSRP change information not meeting the third change condition, Msg3 of the four-step random access process for initial access of SDT is initiated.

[0160] Among them, the implementation method of ensuring that the location information of the terminal device meets the third preset condition can be found in the description of the above embodiment and will not be repeated here.

[0161] In the embodiment of the present disclosure, the RSRP change information satisfies the third change condition including: the value of the currently measured downlink path loss reference RSRP is greater than the third threshold value. For example, the RSRP change condition may be: the downlink path loss reference RSRP is greater than the threshold value sdt-MSGA-RSRP-Threshold.

[0162] By implementing the embodiments of the present disclosure, it is possible to determine whether it is Msg3 of the four-step random access process for initiating the initial access of SDT or MsgA of the two-step random access process for initiating the initial access of SDT by combining the location change factor and RSRP change of the terminal device, so that the NTN network can support SDT and the NTN network cell can cover the near-far effect of signal quality and avoid interference within the cell.

[0163] See also Fig. 9 , Fig. 9FIG. 1 is a flowchart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure. It should be noted that the SDT processing method for a non-terrestrial network in an embodiment of the present disclosure can be applied to a terminal device. Fig. 9 As shown, the SDT processing method for the non-terrestrial network may include but is not limited to the following steps.

[0164] Step 901, determine the location information of the terminal device.

[0165] In the embodiments of the present disclosure, step 901 may be implemented in any manner in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0166] Step 902: Determine whether to initiate SDT on SUL or NUL based on the location information of the terminal device.

[0167] In some embodiments of the present disclosure, it can be determined whether the location information of the terminal device satisfies a fourth preset condition; in response to the location information of the terminal device satisfying the fourth preset condition, SDT is initiated on the SUL; in response to the location information of the terminal device not satisfying the fourth preset condition, SDT is initiated on the NUL.

[0168] That is, the location information of the terminal device needs to be considered when determining whether to initiate SDT on the SUL or the NUL. In one implementation, the location information of the terminal device satisfies the fourth preset condition and includes at least any one of the following:

[0169] The distance from the terminal device to the network side device is greater than the fourth distance threshold; the RTT between the terminal device and the network side device is greater than the fourth time threshold; the TA value estimated by the terminal device is increased by the fourth threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the fourth threshold relative to the currently used TA value.

[0170] That is to say, when the terminal device can determine whether its location information meets certain conditions, it can be achieved in the following ways: if the distance from the terminal device to the satellite is greater than the fourth distance threshold, the location information of the terminal device is considered to meet the fourth preset condition; or, if the distance from the terminal device to the ground reference point is greater than the fourth distance threshold, the location information of the terminal device is considered to meet the fourth preset condition; or, if the distance from the terminal device to the base station gNB is greater than the fourth distance threshold, the location information of the terminal device is considered to meet the fourth preset condition; or, if the distance from the terminal device to the reference point between the satellite and the base station is greater than the fourth distance threshold, the location information of the terminal device is considered to meet the fourth preset condition.

[0171] For example, if the RTT from the terminal device to the satellite is greater than the fourth time threshold, the location information of the terminal device is considered to meet the fourth preset condition; or, if the RTT from the terminal device to the ground reference point is greater than the fourth time threshold, the location information of the terminal device is considered to meet the fourth preset condition; or, if the RTT from the terminal device to the base station gNB is greater than the fourth time threshold, the location information of the terminal device is considered to meet the fourth preset condition; or, if the RTT from the terminal device to the reference point between the satellite and the base station is greater than the fourth time threshold, the location information of the terminal device is considered to meet the fourth preset condition.

[0172] In some embodiments, the terminal device may also estimate the TA value periodically or irregularly, and use the difference between the estimated TA value and the currently used TA value to determine whether the location of the terminal device meets certain conditions. As an example, the terminal device estimates the TA value periodically or irregularly, and determines that the estimated TA value increases or decreases by a certain threshold relative to the currently used TA value, and then it is considered that the location information of the terminal device meets the fourth preset condition.

[0173] By implementing the embodiments of the present disclosure, it is possible to determine whether to initiate SDT on SUL or NUL based on the location information of the terminal device, that is, considering the location information when determining whether to initiate SDT on SUL or NUL, so that the NTN network can support SDT.

[0174] In some embodiments of the present disclosure, location information judgment can be used in combination with RSRP. Only when the corresponding conditions are met can SDT be initiated on NUL, otherwise SDT is initiated on SUL. As an example, it is judged whether the location information of the terminal device meets the fifth preset condition; it is judged whether the RSRP change information meets the fourth change condition; in response to the location information of the terminal device meeting the fifth preset condition and the RSRP change information meeting the fourth change condition, SDT is initiated on NUL; in response to the location information of the terminal device not meeting the fifth preset condition and / or the RSRP change information not meeting the fourth change condition, SDT is initiated on SUL.

[0175] In one implementation, the location information of the terminal device satisfies the fifth preset condition, including at least any one of the following: the distance between the terminal device and the network side device is less than the fifth distance threshold; the RTT between the terminal device and the network side device is less than the fifth time threshold. The network side device may include any one of the following: a satellite, a ground reference point, a base station, and a reference point between a satellite and a base station.

[0176] That is to say, when the terminal device can determine whether its location information meets certain conditions, it can be achieved in the following ways: if the distance from the terminal device to the satellite is less than the fifth distance threshold, the location information of the terminal device is considered to meet the fifth preset condition; or, if the distance from the terminal device to the ground reference point is less than the fifth distance threshold, the location information of the terminal device is considered to meet the fifth preset condition; or, if the distance from the terminal device to the base station gNB is less than the fifth distance threshold, the location information of the terminal device is considered to meet the fifth preset condition; or, if the distance from the terminal device to the reference point between the satellite and the base station is less than the fifth distance threshold, the location information of the terminal device is considered to meet the fifth preset condition.

[0177] For example, if the RTT from the terminal device to the satellite is less than the fifth time threshold, the location information of the terminal device is considered to meet the fifth preset condition; or, if the RTT from the terminal device to the ground reference point is less than the fifth time threshold, the location information of the terminal device is considered to meet the fifth preset condition; or, if the RTT from the terminal device to the base station gNB is less than the fifth time threshold, the location information of the terminal device is considered to meet the fifth preset condition; or, if the RTT from the terminal device to the reference point between the satellite and the base station is less than the fifth time threshold, the location information of the terminal device is considered to meet the fifth preset condition.

[0178] In one implementation, RSRP change information satisfies the fourth change condition including: the value of the currently measured downlink path loss reference RSRP is greater than the fourth threshold value. That is, the position information judgment can be used in combination with RSRP, and SDT is initiated on NUL only when the distance is less than a certain threshold and RSRP is greater than a certain threshold, otherwise it is initiated on SUL. Alternatively, SDT is initiated on NUL only when RTT is less than a certain threshold and RSRP is greater than a certain threshold, otherwise it is initiated on SUL.

[0179] By implementing the embodiments of the present disclosure, by combining the location change factor and RSRP change of the terminal device to determine whether to initiate SDT on SUL or NUL, that is, considering the location change factor and RSRP change of the terminal device when determining whether to initiate SDT on SUL or NUL, the NTN network can support SDT, so that the NTN network cell can cover the far-near effect of signal quality and avoid interference within the cell.

[0180] In other embodiments of the present disclosure, the location information judgment can be used in combination with RSRP, and only when the corresponding conditions are met can SDT be initiated on NUL, otherwise SDT is initiated on SUL. As an example, it is judged whether the location information of the terminal device meets the sixth preset condition; it is judged whether the RSRP change information meets the fifth change condition; in response to the location information of the terminal device meeting the sixth preset condition and the RSRP change information meeting the fifth change condition, SDT is initiated on SUL; in response to the location information of the terminal device not meeting the sixth preset condition, and / or the RSRP change information not meeting the fifth change condition, SDT is initiated on NUL.

[0181] In one implementation, the location information of the terminal device satisfies the sixth preset condition, including at least any one of the following: the distance between the terminal device and the network side device is greater than a sixth distance threshold; the RTT between the terminal device and the network side device is greater than a sixth time threshold. The network side device may include any one of the following: a satellite, a ground reference point, a base station, and a reference point between a satellite and a base station.

[0182] That is to say, when the terminal device can determine whether its location information meets certain conditions, it can be achieved in the following ways: if the distance from the terminal device to the satellite is greater than the sixth distance threshold, the location information of the terminal device is considered to meet the sixth preset condition; or, if the distance from the terminal device to the ground reference point is greater than the sixth distance threshold, the location information of the terminal device is considered to meet the sixth preset condition; or, if the distance from the terminal device to the base station gNB is greater than the sixth distance threshold, the location information of the terminal device is considered to meet the sixth preset condition; or, if the distance from the terminal device to the reference point between the satellite and the base station is greater than the sixth distance threshold, the location information of the terminal device is considered to meet the sixth preset condition.

[0183] For example, if the RTT from the terminal device to the satellite is greater than the sixth time threshold, the location information of the terminal device is considered to meet the sixth preset condition; or, if the RTT from the terminal device to the ground reference point is greater than the sixth time threshold, the location information of the terminal device is considered to meet the sixth preset condition; or, if the RTT from the terminal device to the base station gNB is greater than the sixth time threshold, the location information of the terminal device is considered to meet the sixth preset condition; or, if the RTT from the terminal device to the reference point between the satellite and the base station is greater than the sixth time threshold, the location information of the terminal device is considered to meet the sixth preset condition.

[0184] In one implementation, RSRP change information satisfies the fifth change condition including: the value of the currently measured downlink path loss reference RSRP is less than the fifth threshold value. That is, the position information judgment can be used in combination with RSRP, and SDT is initiated on SUL only when the distance is greater than a certain threshold and RSRP is less than a certain threshold, otherwise SDT is initiated on NUL. Alternatively, SDT is initiated on SUL only when RTT is greater than a certain threshold and RSRP is less than a certain threshold, otherwise SDT is initiated on NUL. As an example, the fifth change condition of RSRP may be: the downlink path loss reference RSRP is less than the threshold value sdt-RSRP-ThresholdSSB-SUL.

[0185] By implementing the embodiments of the present disclosure, it is possible to determine whether to initiate SDT on SUL or NUL by combining the location change factor and RSRP change of the terminal device, that is, the location change factor and RSRP change of the terminal device are considered when determining whether to initiate SDT on SUL or NUL, so that the NTN network can support SDT, so that the NTN network cell can cover the far-near effect of signal quality and avoid interference within the cell.

[0186] See also Fig.10 , Fig.10 FIG. 1 is a flowchart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure. It should be noted that the SDT processing method for a non-terrestrial network in an embodiment of the present disclosure can be applied to a terminal device. Fig.10 As shown, the SDT processing method for the non-terrestrial network may include but is not limited to the following steps.

[0187] Step 1001, determine the location information of the terminal device.

[0188] In the embodiments of the present disclosure, step 1001 may be implemented in any manner in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0189] Step 1002: Determine whether the time alignment timer TAT has expired based on the location information of the terminal device.

[0190] In some embodiments according to the present disclosure, it can be determined whether the location information of the terminal device satisfies the seventh preset condition, and in response to the location information of the terminal device satisfying the seventh preset condition, it is determined that the TAT times out. As an example, the TAT may include a timeAlignmentTimer (time alignment timer) and a cg-SDT-TimeAlignmentTimer (cg-SDT time alignment timer).

[0191] That is, the location information of the terminal device may be considered when determining the TAT timeout. In one implementation, the location information of the terminal device satisfies the seventh preset condition and includes at least one of the following:

[0192] The distance from the terminal device to the network side device is greater than the seventh distance threshold; the RTT between the terminal device and the network side device is greater than the seventh time threshold; the TA value estimated by the terminal device is increased by the fifth threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the fifth threshold relative to the currently used TA value.

[0193] That is to say, when the terminal device can determine whether its location information meets certain conditions, it can be achieved in the following ways: if the distance from the terminal device to the satellite is greater than the seventh distance threshold, the location information of the terminal device is considered to meet the seventh preset condition; or, if the distance from the terminal device to the ground reference point is greater than the seventh distance threshold, the location information of the terminal device is considered to meet the seventh preset condition; or, if the distance from the terminal device to the base station gNB is greater than the seventh distance threshold, the location information of the terminal device is considered to meet the seventh preset condition; or, if the distance from the terminal device to the reference point between the satellite and the base station is greater than the seventh distance threshold, the location information of the terminal device is considered to meet the seventh preset condition.

[0194] For example, if the RTT from the terminal device to the satellite is greater than the seventh time threshold, the location information of the terminal device is considered to meet the seventh preset condition; or, if the RTT from the terminal device to the ground reference point is greater than the seventh time threshold, the location information of the terminal device is considered to meet the seventh preset condition; or, if the RTT from the terminal device to the base station gNB is greater than the seventh time threshold, the location information of the terminal device is considered to meet the seventh preset condition; or, if the RTT from the terminal device to the reference point between the satellite and the base station is greater than the seventh time threshold, the location information of the terminal device is considered to meet the seventh preset condition.

[0195] In some embodiments, the terminal device may also estimate the TA value periodically or irregularly, and use the difference between the estimated TA value and the currently used TA value to determine whether the location of the terminal device meets certain conditions. As an example, the terminal device estimates the TA value periodically or irregularly, and determines that the estimated TA value increases or decreases by a certain threshold relative to the currently used TA value, and then it is considered that the location information of the terminal device meets the seventh preset condition.

[0196] By implementing the embodiments of the present disclosure, TAT timeout can be determined based on the location information of the terminal device, that is, the location information of the terminal device is considered when determining TAT timeout, so that the terminal device performs link exception processing when determining TAT timeout, thereby improving the NTN system communication process and ensuring the normal operation of the NTN system communication, so that the NTN network can support SDT.

[0197] It is understandable that Figure 4b As shown, for the CG-SDT resources configured by the network, after the UE uses the CG resource to send data, it will start a feedback timer (such as feedbackTimer) to listen to the feedback information on the network side. If the UE does not receive a successful reception confirmation from the network side during the operation of the feedback timer, the UE retransmits the data on the subsequent CG resource. However, since the RTT of the NTN network is very long, and some timers of the SDT need to take into account the feedback delay, the timer needs to be enhanced. In some embodiments of the present disclosure, the terminal device may also enhance the timer when starting the timer after transmission on the CG SDT.

[0198] In an optional implementation, enhanced processing of the timer may be achieved in the following manner: offsetting the start time of the timer by an RTT between the terminal device and the base station; or increasing the value of the timer by an RTT between the terminal device and the base station.

[0199] Optionally, the timer may be any one of the following: a configuration authorization timer of SDT; a configuration authorization retransmission timer of SDT; a preset timer, wherein the preset timer is used to indicate that the terminal device automatically retransmits after the preset timer times out, or waits for feedback from the base station during the operation of the preset timer. Optionally, the preset timer is a CG SDT.

[0200] For example, when the terminal device starts the SDT configuration authorization timer (such as SDT-configuredGrantTimer) after transmitting on the CG SDT, the timer start time is offset by the RTT between the terminal device and the base station, or the timer value increases by the RTT between the terminal device and the base station.

[0201] For example, after the terminal device transmits on the CG SDT, it starts the SDT configuration authorization retransmission timer (such as cg-SDT-RetransmissionTimer), and the timer start time is offset by the RTT between the terminal device and the base station, or the timer value increases by the RTT between the terminal device and the base station.

[0202] For another example, after the terminal device transmits on the CG SDT, a timer is started, and the timer is used for the terminal device to automatically retransmit after the timer times out or wait for feedback from the base station (such as uplink / downlink scheduling, or ACK / NACK feedback) during the operation of the timer. The start time of the timer is offset by the RTT between the terminal device and the base station, or the value of the timer increases the RTT between the terminal device and the base station. The timer can be a CG SDT.

[0203] By implementing the embodiments of the present disclosure, when the timer is started after transmission on the CG SDT, the timer is enhanced so that the timer start time is offset by the RTT between the terminal device and the base station or the timer value is increased by one RTT, so that the timer can adapt to the NTN network, thereby improving the NTN system communication process and ensuring the normal operation of the NTN system communication, so that the NTN network can support SDT.

[0204] It can be understood that the above embodiment describes the implementation of the SDT processing method for non-terrestrial networks of the embodiment of the present disclosure from the terminal device side. The embodiment of the present disclosure also proposes another SDT processing method for non-terrestrial networks, and the implementation of the SDT processing method for non-terrestrial networks will be described from the network side device. Fig.11 , Fig.11 FIG. 1 is a flowchart of another SDT processing method for a non-terrestrial network provided by an embodiment of the present disclosure. It should be noted that the SDT processing method for a non-terrestrial network in an embodiment of the present disclosure can be applied to a network side device. Fig.11 As shown, the SDT processing method for the non-terrestrial network may include but is not limited to the following steps.

[0205] Step 1101, receiving an SDT random access request sent by a terminal device; wherein the SDT random access request carries a small data transmission indication, and the small data transmission indication is used to inform the network side device that wireless access signaling will be used to carry small data packets.

[0206] Step 1102, in response to the SDT random access request, a random access response is sent to the terminal device; the random access response carries the uplink configuration authorization resources and threshold configuration information allocated to the terminal device, wherein the threshold configuration information is used by the terminal device as a basis for judging the SDT transmission condition when judging the SDT transmission condition according to the location information of the terminal device.

[0207] For example, a terminal device registers with a network and establishes a secure connection with the network. The terminal device initiates a random access request, which carries a terminal identifier and a small data transmission indication. In the embodiment of the present disclosure, the small data transmission indication may be a connectionless indication or a small data transmission indication. The purpose of the indication is to inform the network that the terminal will use wireless access signaling to carry a small data packet. After receiving the indication, the network uses a small data transmission mode to transmit a small data packet to the terminal. The wireless access network returns a random access response, which carries a terminal identifier and uplink authorization resources allocated to the terminal device. The terminal device sends a random access response and carries an uplink small data packet. Optionally, the small data packet is expressed as an encrypted NAS (Non-Access Stratum) data packet. The wireless access network selects a suitable core network for the terminal according to the terminal identifier, and sends an initialization UE context message, which carries a terminal identifier and an encrypted data packet. The core network verifies the message and decrypts the data. The core network sends the small data to the PGW (PDN GateWay) and temporarily stores the wireless access network identifier of the terminal sending the small data.

[0208] In an embodiment of the present disclosure, when a network-side device returns a random access response to a terminal device, the random access response carries uplink configuration authorization resources and threshold configuration information allocated to the terminal device, wherein the threshold configuration information is used as a basis for the terminal device to judge the SDT transmission condition according to its own location information. In one implementation, the threshold configuration information may include: a distance threshold (such as a first distance threshold) used to judge whether a TA value is valid according to location information, a time threshold (such as a first time threshold), a first threshold (used as a basis for judging whether the location information meets the first preset condition based on the estimated TA value and the currently used TA value) and a first threshold value (used as a basis for judging whether the RSRP change information meets the first change condition when combining the location information and RSRP to judge whether the TA value is valid).

[0209] Optionally, the threshold configuration information may also include: a distance threshold (such as a second distance threshold) used to determine whether to initiate small data transmission SDT based on location information, a time threshold (such as a second time threshold), a second threshold (used as a basis for determining whether the location information meets the second preset condition based on the estimated TA value and the currently used TA value), and a second threshold value (used to determine whether to initiate small data transmission SDT in combination with location information and RSRP, as a basis for determining whether RSRP change information meets the second change condition).

[0210] Optionally, the threshold configuration information may also include: a distance threshold (such as a third distance threshold) used to determine whether it is Msg3 of the four-step random access process for initiating the initial access of SDT or MsgA of the two-step random access process for initiating the initial access of SDT based on the location information, a time threshold (such as a third time threshold), a third threshold (used as a basis for determining whether the location information meets the third preset condition based on the estimated TA value and the currently used TA value) and a third threshold value (used to determine whether the RSRP change information meets the third change condition when combining the location information and RSRP to determine whether it is Msg3 of the four-step random access process for initiating the initial access of SDT or MsgA of the two-step random access process for initiating the initial access of SDT).

[0211] Optionally, the threshold configuration information may also include: a distance threshold (such as a fourth distance threshold or a fifth distance threshold or a sixth distance threshold) used when determining whether to initiate SDT on SUL or NUL based on the location information, a time threshold (such as a fourth time threshold or a fifth time threshold or a sixth time threshold), a fourth threshold (used as a basis for determining whether the location information meets the fourth preset condition based on the estimated TA value and the currently used TA value), a fifth threshold (used as a basis for determining whether the location information meets the fifth preset condition based on the estimated TA value and the currently used TA value), a fourth threshold value (used to determine whether the SDT is initiated on SUL or NUL in combination with the location information and RSRP as a basis for determining whether the RSRP change information meets the fourth change condition), and a fifth threshold value (used to determine whether the SDT is initiated on SUL or NUL in combination with the location information and RSRP as a basis for determining whether the RSRP change information meets the fifth change condition).

[0212] Optionally, the threshold configuration information may also include: a distance threshold (such as the seventh distance threshold) used to determine when the time alignment timer TAT times out based on the location information, a time threshold (such as the seventh time threshold), and a fifth threshold (used as a basis for determining whether the location information meets the seventh preset condition based on the estimated TA value and the currently used TA value).

[0213] By implementing the embodiments of the present disclosure, location information may be considered when applying the SDT technology in the NTN network, thereby enabling the NTN network to support SDT.

[0214] In the above embodiments provided by the present disclosure, the methods provided by the embodiments of the present disclosure are introduced from the perspectives of the terminal device and the network side device, respectively. In order to implement the functions in the methods provided by the above embodiments of the present disclosure, the terminal device and the network side device may include a hardware structure and a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. One of the above functions may be executed in the form of a hardware structure, a software module, or a hardware structure plus a software module.

[0215] See also Fig.12 , Fig.12 The structure diagram of a communication device provided by an embodiment of the present disclosure is shown in FIG. Fig.12 The communication device 1200 shown may include a processing module 1201. The processing module 1201 may be a processor.

[0216] The communication device 1200 may be a terminal device, or a device in a terminal device, or a device that can be used in conjunction with a terminal device. Alternatively, the communication device 1200 may be a network side device, or a device in a network side device, or a device that can be used in conjunction with a network side device.

[0217] The communication device 1200 is a terminal device: in the embodiment of the present disclosure, the processing module 1201 is used to determine the location information of the terminal device. The judgment module 1202 is used to judge the SDT transmission condition according to the location information of the terminal device.

[0218] In one implementation, the determination module 1202 is specifically used to determine whether the timing advance TA value used for SDT is valid according to the location information of the terminal device.

[0219] In an optional implementation, the judgment module 1202 is specifically used to: for an SDT using a configured grant resource allocation method, when the location information of the terminal device meets a first preset condition, determine that the TA value used for the SDT is valid.

[0220] In another optional implementation, the judgment module 1202 is specifically used to: for SDT using the configured grant resource allocation method, when the location information of the terminal device meets the first preset condition and the reference signal received power RSRP change information meets the first change condition, determine that the TA value used for SDT is valid.

[0221] Optionally, the location information of the terminal device satisfies the first preset condition and includes at least any one of the following:

[0222] The distance from the terminal device to the network side device increases by a first distance threshold relative to the last acquired or recorded distance from the terminal device to the network side device; the distance from the terminal device to the network side device decreases by a first distance threshold relative to the last acquired or recorded distance from the terminal device to the network side device; the round-trip time RTT between the terminal device and the network side device increases by a first time threshold relative to the last acquired or recorded RTT between the terminal device and the network side device; the round-trip time RTT between the terminal device and the network side device decreases by a first time threshold relative to the last acquired or recorded RTT between the terminal device and the network side device; the TA value estimated by the terminal device increases by a first threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by a first threshold relative to the currently used TA value.

[0223] The RSRP change information satisfies a first change condition, including: an absolute value of a difference between a currently measured downlink path loss reference RSRP value and a stored downlink path loss reference RSRP value is less than a first threshold value.

[0224] In one implementation, the determination module 1202 is specifically configured to determine whether to initiate a small data transmission SDT according to the location information of the terminal device.

[0225] In some embodiments according to the present disclosure, the determination module 1202 is specifically used to: determine whether the location information of the terminal device meets the second preset condition; and initiate SDT in response to the location information of the terminal device meeting the second preset condition.

[0226] In other embodiments of the present disclosure, the judgment module 1202 is specifically used to: judge whether the location information of the terminal device meets the second preset condition; judge whether the RSRP change information meets the second change condition; in response to the location information of the terminal device meeting the second preset condition and the RSRP change information meeting the second change condition, initiate SDT.

[0227] In one implementation, the location information of the terminal device satisfies the second preset condition, including at least one of the following:

[0228] The distance from the terminal device to the network side device is less than the second distance threshold; the RTT between the terminal device and the network side device is less than the second time threshold; the TA value estimated by the terminal device is increased by the second threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the second threshold relative to the currently used TA value.

[0229] Optionally, the RSRP change information satisfies a second change condition, including: a currently measured downlink path loss reference RSRP value is greater than a second threshold value.

[0230] In one implementation, the determination module 1202 is specifically used to determine, according to the location information of the terminal device, whether it is message 3 Msg3 of the four-step random access process for initiating the initial access of the SDT or message A MsgA of the two-step random access process for initiating the initial access of the SDT.

[0231] In some embodiments according to the present disclosure, the judgment module 1202 is specifically used to: judge whether the location information of the terminal device meets the third preset condition; in response to the location information of the terminal device meeting the third preset condition, initiate MsgA of the two-step random access process for initial access of the SDT; in response to the location information of the terminal device not meeting the third preset condition, initiate Msg3 of the four-step random access process for initial access of the SDT.

[0232] In other embodiments of the present disclosure, the judgment module 1202 is specifically used to: judge whether the location information of the terminal device satisfies a third preset condition; judge whether the RSRP change information satisfies the third change condition; in response to the location information of the terminal device satisfying the third preset condition and the RSRP change information satisfying the third change condition, initiate MsgA of a two-step random access process for initial access of the SDT; in response to the location information of the terminal device not satisfying the third preset condition, and / or the RSRP change information not satisfying the third change condition, initiate Msg3 of a four-step random access process for initial access of the SDT.

[0233] In one implementation, the location information of the terminal device satisfies the third preset condition and includes at least any one of the following:

[0234] The distance from the terminal device to the network side device is less than the third distance threshold; the RTT between the terminal device and the network side device is less than the third time threshold; the TA value estimated by the terminal device is increased by the third threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the third threshold relative to the currently used TA value.

[0235] In one implementation, the RSRP change information satisfies the third change condition including: a currently measured downlink path loss reference RSRP value is greater than a third threshold value.

[0236] In one implementation, the determination module 1202 is specifically used to determine whether to initiate the SDT on the supplementary uplink SUL or the normal uplink NUL according to the location information of the terminal device.

[0237] In some embodiments according to the present disclosure, the judgment module 1202 is specifically used to: judge whether the location information of the terminal device satisfies a fourth preset condition; in response to the location information of the terminal device satisfying the fourth preset condition, initiate SDT on the SUL; in response to the location information of the terminal device not satisfying the fourth preset condition, initiate SDT on the NUL.

[0238] In one implementation, the location information of the terminal device satisfies the fourth preset condition and includes at least any one of the following:

[0239] The distance from the terminal device to the network side device is greater than the fourth distance threshold; the RTT between the terminal device and the network side device is greater than the fourth time threshold; the TA value estimated by the terminal device is increased by the fourth threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the fourth threshold relative to the currently used TA value.

[0240] In other embodiments of the present disclosure, the judgment module 1202 is specifically used to: judge whether the location information of the terminal device satisfies the fifth preset condition; judge whether the RSRP change information satisfies the fourth change condition; in response to the location information of the terminal device satisfying the fifth preset condition and the RSRP change information satisfying the fourth change condition, initiate SDT on NUL; in response to the location information of the terminal device not satisfying the fifth preset condition, and / or the RSRP change information not satisfying the fourth change condition, initiate SDT on SUL.

[0241] Among them, the location information of the terminal device satisfies the fifth preset condition, including at least one of the following: the distance from the terminal device to the network side device is less than the fifth distance threshold; the RTT between the terminal device and the network side device is less than the fifth time threshold.

[0242] Optionally, the RSRP change information satisfies a fourth change condition including: a currently measured downlink path loss reference RSRP value is greater than a fourth threshold value.

[0243] In some embodiments according to the present disclosure, the judgment module 1202 is specifically used to: judge whether the location information of the terminal device satisfies the sixth preset condition; judge whether the RSRP change information satisfies the fifth change condition; in response to the location information of the terminal device satisfying the sixth preset condition and the RSRP change information satisfying the fifth change condition, initiate SDT on SUL; in response to the location information of the terminal device not satisfying the sixth preset condition, and / or the RSRP change information not satisfying the fifth change condition, initiate SDT on NUL.

[0244] Among them, the location information of the terminal device satisfies the sixth preset condition, including at least any one of the following: the distance from the terminal device to the network side device is greater than the sixth distance threshold; the RTT between the terminal device and the network side device is greater than the sixth time threshold.

[0245] Optionally, the RSRP change information satisfies the fifth change condition including: a currently measured downlink path loss reference RSRP value is less than a fifth threshold value.

[0246] In one implementation, the determination module 1202 is specifically used to determine whether the time alignment timer TAT has timed out based on the location information of the terminal device.

[0247] In some embodiments according to the present disclosure, the judgment module 1202 is specifically used to: judge whether the location information of the terminal device meets the seventh preset condition; in response to the location information of the terminal device meeting the seventh preset condition, determine that the TAT times out.

[0248] In one implementation, the location information of the terminal device satisfies the seventh preset condition and includes at least any one of the following:

[0249] The distance from the terminal device to the network side device is greater than the seventh distance threshold; the RTT between the terminal device and the network side device is greater than the seventh time threshold; the TA value estimated by the terminal device is increased by the fifth threshold relative to the currently used TA value; the TA value estimated by the terminal device is reduced by the fifth threshold relative to the currently used TA value.

[0250] In some embodiments according to the present disclosure, the determination module 1202 is further used to: when the timer is started after transmission on the CG SDT, perform enhanced processing on the timer.

[0251] In one implementation, the determination module 1202 is specifically used to: shift the start time of the timer by an RTT between the terminal device and the base station; or increase the value of the timer by an RTT between the terminal device and the base station.

[0252] In an optional implementation, the timer is any one of the following: a configuration authorization timer of the SDT;

[0253] SDT configuration authorization retransmission timer; preset timer, the preset timer is used to indicate that the terminal device automatically retransmits after the preset timer expires, or waits for feedback from the base station during the operation of the preset timer.

[0254] Optionally, the preset timer is CG SDT.

[0255] In an optional implementation, the above-mentioned network side device includes any one of the following: a satellite, a ground reference point, a base station, and a reference point between a satellite and a base station.

[0256] The communication device 1200 is a network side device: In the embodiment of the present disclosure, the transceiver module 1203 is used to receive an SDT random access request sent by a terminal device; wherein the SDT random access request carries a small data transmission indication, and the small data transmission indication is used to inform the network side device that wireless access signaling will be used to carry small data packets. The transceiver module 1203 is also used to send a random access response to the terminal device in response to the SDT random access request; the random access response carries the uplink configuration authorization resources and threshold configuration information allocated to the terminal device, wherein the threshold configuration information is used by the terminal device as a basis for judging the SDT transmission condition when judging the SDT transmission condition according to the location information of the terminal device.

[0257] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0258] See also Fig.13 , Fig.13 1 is a schematic diagram of the structure of a communication device 1300 provided in an embodiment of the present disclosure. The communication device 1300 may be a terminal device, or a network side device, or a chip, a chip system, or a processor that supports the terminal device to implement the above method, or a chip, a chip system, or a processor that supports the network side device to implement the above method. The device may be used to implement the method described in the above method embodiment, and the details may refer to the description in the above method embodiment.

[0259] The communication device 1300 may include one or more processors 1301. The processor 1301 may be a general-purpose processor or a dedicated processor, etc. For example, it may be a baseband processor or a central processing unit. The baseband processor may be used to process the communication protocol and communication data, and the central processing unit may be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute a computer program, and process the data of the computer program.

[0260] Optionally, the communication device 1300 may further include one or more memories 1302, on which a computer program 1304 may be stored, and the processor 1301 executes the computer program 1304 so that the communication device 130 performs the method described in the above method embodiment. Optionally, data may also be stored in the memory 1302. The communication device 1300 and the memory 1302 may be provided separately or integrated together.

[0261] Optionally, the communication device 1300 may further include a transceiver 1305 and an antenna 1306. The transceiver 1305 may be referred to as a transceiver unit, a transceiver, or a transceiver circuit, etc., and is used to implement a transceiver function. The transceiver 1305 may include a receiver and a transmitter, the receiver may be referred to as a receiver or a receiving circuit, etc., and is used to implement a receiving function; the transmitter may be referred to as a transmitter or a transmitting circuit, etc., and is used to implement a transmitting function.

[0262] Optionally, the communication device 1300 may further include one or more interface circuits 1307. The interface circuit 1307 is used to receive code instructions and transmit them to the processor 1301. The processor 1301 runs the code instructions to enable the communication device 1300 to execute the method described in the above method embodiment.

[0263] The communication device 1300 is a terminal device: the transceiver 1305 is used to perform Figure 5 Steps 501 and 502 in the above; Execute Figure 6 Steps 601 and 602 in the above embodiment; Execute Fig.13 Steps 1301 and 1302 in the above embodiment; Execute Figure 8 Steps 801 and 802 in the above embodiment; Execute Fig. 9 Steps 901 and 902 in the above embodiment; Execute Fig.10 Steps 1001 and 1002 in the above description; executing the step of "performing enhanced processing on the timer when starting the timer after transmission on the CG SDT"; executing the step of "offsetting the start time of the timer by the RTT between the terminal device and the base station; or, increasing the value of the timer by the RTT between the terminal device and the base station".

[0264] The communication device 1300 is a network side device: the transceiver 1305 is used to perform Fig.11 Step 1101 and step 1102 in .

[0265] In one implementation, the processor 1301 may include a transceiver for implementing the receiving and sending functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing the receiving and sending functions may be separate or integrated. The above-mentioned transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or the above-mentioned transceiver circuit, interface, or interface circuit may be used for transmitting or delivering signals.

[0266] In one implementation, the memory 1302 may store a computer program 1304, which runs on the processor 1301, and enables the communication device 1300 to perform the method described in the above method embodiment. The computer program 1304 may be fixed in the processor 1301, in which case the processor 1301 may be implemented by hardware.

[0267] In one implementation, the communication device 1300 may include a circuit that can implement the functions of sending or receiving or communicating in the aforementioned method embodiments. The processor and transceiver described in the present disclosure may be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit RFIC, a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and transceiver may also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (nMetal-oxide-semiconductor, NMOS), P-type metal oxide semiconductor (positive channelmetal oxide semiconductor, PMOS), bipolar junction transistor (bipolar junction transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0268] The communication device described in the above embodiments may be a terminal device, but the scope of the communication device described in the present disclosure is not limited thereto, and the structure of the communication device may not be limited thereto. Fig.13 The communication device may be an independent device or may be part of a larger device. For example, the communication device may be:

[0269] (1) Independent integrated circuit IC, or chip, or chip system or subsystem;

[0270] (2) having a set of one or more ICs, and optionally, the IC set may also include a storage component for storing data and computer programs;

[0271] (3) ASIC, such as modem;

[0272] (4) Modules that can be embedded in other devices;

[0273] (5) Receivers, terminal devices, intelligent terminal devices, cellular phones, wireless devices, handheld devices, mobile units, vehicle-mounted devices, network devices, cloud devices, artificial intelligence devices, etc.;

[0274] (6)Others

[0275] Those skilled in the art may also understand that the various illustrative logical blocks and steps listed in the embodiments of the present disclosure may be implemented by electronic hardware, computer software, or a combination of the two. Whether such functions are implemented by hardware or software depends on the specific application and the design requirements of the entire system. Those skilled in the art may use various methods to implement the functions described for each specific application, but such implementation should not be understood as exceeding the scope of protection of the embodiments of the present disclosure.

[0276] The present disclosure also provides a communication system, which includes the aforementioned Fig.12 In the embodiment, the communication device as the terminal device and the communication device as the network side device, or the system includes the aforementioned Fig.13 The communication device in the embodiment serves as a terminal device and the communication device serves as a network side device.

[0277] The present disclosure also provides a readable storage medium having instructions stored thereon, which implement the functions of any of the above method embodiments when executed by a computer.

[0278] The present disclosure also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.

[0279] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, the process or function described in the embodiment of the present disclosure is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0280] Those skilled in the art can understand that the various numerical numbers such as first and second involved in the present disclosure are only used for distinction for convenience of description and are not used to limit the scope of the embodiments of the present disclosure, and also indicate the order of precedence.

[0281] At least one in the present disclosure may also be described as one or more, and a plurality may be two, three, four or more, which is not limited in the present disclosure. In the embodiments of the present disclosure, for a technical feature, the technical features in the technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", etc., and there is no order of precedence or size between the technical features described by the "first", "second", "third", "A", "B", "C" and "D".

[0282] The corresponding relationships shown in the tables in the present disclosure can be configured or predefined. The values ​​of the information in each table are only examples and can be configured as other values, which are not limited by the present disclosure. When configuring the corresponding relationship between the information and each parameter, it is not necessarily required to configure all the corresponding relationships illustrated in each table. For example, in the table in the present disclosure, the corresponding relationships shown in some rows may not be configured. For another example, appropriate deformation adjustments can be made based on the above table, such as splitting, merging, etc. The names of the parameters shown in the titles of the above tables can also use other names that can be understood by the communication device, and the values ​​or representations of the parameters can also be other values ​​or representations that can be understood by the communication device. When implementing the above tables, other data structures can also be used, such as arrays, queues, containers, stacks, linear lists, pointers, linked lists, trees, graphs, structures, classes, heaps, hash tables or hash tables.

[0283] The predefined in the present disclosure may be understood as defined, predefined, stored, pre-stored, pre-negotiated, pre-configured, solidified, or pre-burned.

[0284] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this disclosure.

[0285] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0286] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A SDT processing method for a non-terrestrial network, characterized in that: The method is performed by a terminal device, and the method includes: Determining location information of the terminal device; The SDT transmission condition is judged according to the location information of the terminal device and the reference signal received power RSRP change information; wherein the judgment of the SDT transmission condition includes at least one of the following: Determining whether a timing advance TA value used for the SDT is valid; Determine whether to initiate small data transmission SDT; Determine whether it is message 3 Msg3 of the four-step random access process for initiating the initial access of the SDT, or message A MsgA of the two-step random access process for initiating the initial access of the SDT; Determine whether to initiate the SDT on a supplementary uplink SUL or a normal uplink NUL; The determining of the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information includes: According to the location information and RSRP change information of the terminal device, it is determined whether the message 3Msg3 of the four-step random access process for initial access of the SDT is initiated or the message AMsgA of the two-step random access process for initial access of the SDT is initiated; wherein, according to the location information and RSRP change information of the terminal device, it is determined whether the message 3Msg3 of the four-step random access process for initial access of the SDT is initiated or the message A MsgA of the two-step random access process for initial access of the SDT is initiated, including: In response to the location information of the terminal device satisfying a third preset condition and the RSRP change information satisfying a third change condition, MsgA of the two-step random access procedure for initiating the initial access of the SDT; In response to the location information of the terminal device not satisfying the third preset condition, and / or the RSRP change information not satisfying the third change condition, initiating Msg3 of the four-step random access process of initial access of the SDT; The location information of the terminal device satisfies the third preset condition, which includes at least any one of the following: the distance between the terminal device and the network side device is less than the third distance threshold; the RTT between the terminal device and the network side device is less than the third time threshold; the TA value estimated by the terminal device increases by the third threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by the third threshold relative to the currently used TA value; The RSRP change information satisfies the third change condition including: the currently measured downlink path loss reference RSRP value is greater than the third threshold value; The network side device includes any one of the following: a satellite, a ground reference point, a base station, and a reference point between the satellite and the base station.

2. The method according to claim 1, characterized in that: The determining of the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information includes: Based on the location information and RSRP change information of the terminal device, determine whether the timing advance TA value used for the SDT is valid.

3. The method according to claim 2, characterized in that The determining, according to the location information and RSRP change information of the terminal device, whether the timing advance TA value used for the SDT is valid includes: For an SDT using a configured grant resource allocation method, when the location information of the terminal device meets a first preset condition and the RSRP change information meets a first change condition, it is determined that the TA value used for the SDT is valid.

4. The method according to claim 3, characterized in that: The location information of the terminal device satisfies the first preset condition, which includes at least one of the following: The distance between the terminal device and the network side device is increased by a first distance threshold relative to the distance between the terminal device and the network side device obtained or recorded last time; The distance between the terminal device and the network side device is reduced by the first distance threshold relative to the distance between the terminal device and the network side device acquired or recorded last time; The round-trip time RTT between the terminal device and the network side device is increased by a first time threshold relative to the RTT between the terminal device and the network side device obtained or recorded last time; The round-trip time RTT between the terminal device and the network side device is reduced by the first time threshold relative to the RTT between the terminal device and the network side device obtained or recorded last time; The TA value estimated by the terminal device is increased by a first threshold value relative to the currently used TA value; The TA value estimated by the terminal device is reduced by the first threshold value relative to the currently used TA value.

5. The method according to claim 3, characterized in that: The RSRP change information satisfies a first change condition, including: An absolute value of a difference between a currently measured downlink path loss reference RSRP value and a stored downlink path loss reference RSRP value is smaller than a first threshold value.

6. The method according to claim 1, characterized in that The determining of the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information includes: Whether to initiate small data transmission SDT is determined according to the location information and RSRP change information of the terminal device.

7. The method according to claim 6, characterized in that The determining whether to initiate small data transmission SDT according to the location information and RSRP change information of the terminal device includes: Determining whether the location information of the terminal device meets a second preset condition; Determining whether the RSRP change information satisfies a second change condition; In response to the location information of the terminal device satisfying the second preset condition and the RSRP change information satisfying the second change condition, the SDT is initiated.

8. The method according to claim 7, characterized in that The location information of the terminal device satisfies at least one of the following conditions: The distance between the terminal device and the network side device is less than a second distance threshold; The RTT between the terminal device and the network side device is less than a second time threshold; The TA value estimated by the terminal device is increased by a second threshold value relative to the currently used TA value; The TA value estimated by the terminal device is reduced by the second threshold relative to the currently used TA value.

9. The method according to claim 7, characterized in that: The RSRP change information satisfies the second change condition, including: The currently measured downlink path loss reference RSRP value is greater than the second threshold value.

10. The method according to claim 1, characterized in that The determining of the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information includes: According to the location information and RSRP change information of the terminal device, it is determined whether to initiate the SDT on the supplementary uplink SUL or the normal uplink NUL.

11. The method according to claim 10, characterized in that The determining, according to the location information and RSRP change information of the terminal device, whether to initiate the SDT on a supplementary uplink SUL or a normal uplink NUL comprises: Determining whether the location information of the terminal device meets a fifth preset condition; Determining whether the RSRP change information satisfies a fourth change condition; In response to the location information of the terminal device satisfying the fifth preset condition and the RSRP change information satisfying the fourth change condition, initiating the SDT on the NUL; In response to the location information of the terminal device not satisfying the fifth preset condition, and / or the RSRP change information not satisfying the fourth change condition, initiating the SDT on the SUL; The location information of the terminal device satisfies the fifth preset condition, which includes at least one of the following: the distance between the terminal device and the network side device is less than the fifth distance threshold; the RTT between the terminal device and the network side device is less than the fifth time threshold; The RSRP change information satisfying the fourth change condition includes: The currently measured downlink path loss reference RSRP value is greater than the fourth threshold value.

12. The method according to claim 10, characterized in that The determining, according to the location information and RSRP change information of the terminal device, whether to initiate the SDT on a supplementary uplink SUL or a normal uplink NUL comprises: Determining whether the location information of the terminal device meets a sixth preset condition; Determining whether the RSRP change information satisfies a fifth change condition; In response to the location information of the terminal device satisfying the sixth preset condition and the RSRP change information satisfying the fifth change condition, initiating the SDT on the SUL; In response to the location information of the terminal device not satisfying the sixth preset condition, and / or the RSRP change information not satisfying the fifth change condition, initiating the SDT on the NUL; The location information of the terminal device satisfies the sixth preset condition, which includes at least one of the following: the distance between the terminal device and the network side device is greater than the sixth distance threshold; the RTT between the terminal device and the network side device is greater than the sixth time threshold; The RSRP change information satisfying the fifth change condition includes: The currently measured downlink path loss reference RSRP value is less than the fifth threshold value.

13. The method according to claim 1, characterized in that Also includes: When a timer is started after transmission on a dedicated physical uplink shared channel PUSCH resource configured by the network, enhanced processing is performed on the timer.

14. The method according to claim 13, characterized in that The enhancing process on the timer includes: offsetting the start time of the timer by an RTT between the terminal device and the base station; Alternatively, the value of the timer is increased by an RTT between the terminal device and the base station.

15. The method according to claim 13 or 14, characterized in that The timer is any one of the following: A configuration authorization timer of the SDT; The configuration authorization retransmission timer of the SDT; A preset timer, wherein the preset timer is used to indicate that the terminal device automatically retransmits after the preset timer times out, or waits for feedback from the base station during the operation of the preset timer.

16. The method according to claim 15, characterized in that The preset timer is a dedicated physical uplink shared channel PUSCH resource configured by the network.

17. A SDT processing method for a non-terrestrial network, characterized in that: The method is performed by a network side device, and the method includes: Receiving an SDT random access request sent by a terminal device; wherein the SDT random access request carries a small data transmission indication, and the small data transmission indication is used to inform the network side device that wireless access signaling will be used to carry a small data packet; In response to the SDT random access request, a random access response is sent to the terminal device; the random access response carries uplink configuration authorization resources and threshold configuration information allocated to the terminal device, wherein the threshold configuration information is used by the terminal device as a basis for judging the SDT transmission condition when judging the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information; wherein the judgment of the SDT transmission condition includes at least one of the following: Determining whether a timing advance TA value used for the SDT is valid; Determine whether to initiate small data transmission SDT; Determine whether it is message 3 Msg3 of the four-step random access process for initiating the initial access of the SDT, or message A MsgA of the two-step random access process for initiating the initial access of the SDT; Determine whether to initiate the SDT on a supplementary uplink SUL or a normal uplink NUL; The determining of the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information includes: According to the location information and RSRP change information of the terminal device, it is determined whether the message 3Msg3 of the four-step random access process for initial access of the SDT is initiated or the message AMsgA of the two-step random access process for initial access of the SDT is initiated; wherein, according to the location information and RSRP change information of the terminal device, it is determined whether the message 3Msg3 of the four-step random access process for initial access of the SDT is initiated or the message A MsgA of the two-step random access process for initial access of the SDT is initiated, including: In response to the location information of the terminal device satisfying a third preset condition and the RSRP change information satisfying a third change condition, initiating MsgA of a two-step random access process for initial access of the SDT; In response to the location information of the terminal device not satisfying the third preset condition, and / or the RSRP change information not satisfying the third change condition, initiating Msg3 of the four-step random access process of initial access of the SDT; The location information of the terminal device satisfies the third preset condition, which includes at least any one of the following: the distance between the terminal device and the network side device is less than the third distance threshold; the RTT between the terminal device and the network side device is less than the third time threshold; the TA value estimated by the terminal device increases by the third threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by the third threshold relative to the currently used TA value; The RSRP change information satisfies the third change condition including: the currently measured downlink path loss reference RSRP value is greater than the third threshold value; The network side device includes any one of the following: a satellite, a ground reference point, a base station, and a reference point between the satellite and the base station.

18. A terminal device, characterized in that: The terminal device is used for SDT processing of a non-terrestrial network, and the terminal device includes: A processing module, the processing module is used to determine the location information of the terminal device; A judgment module, wherein the judgment module is used to judge the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information; wherein the judgment of the SDT transmission condition includes at least one of the following: Determining whether a timing advance TA value used for the SDT is valid; Determine whether to initiate small data transmission SDT; Determine whether it is message 3 Msg3 of the four-step random access process for initiating the initial access of the SDT, or message A MsgA of the two-step random access process for initiating the initial access of the SDT; Determine whether to initiate the SDT on a supplementary uplink SUL or a normal uplink NUL; The determining of the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information includes: According to the location information and RSRP change information of the terminal device, it is determined whether the message 3Msg3 of the four-step random access process for initial access of the SDT is initiated or the message AMsgA of the two-step random access process for initial access of the SDT is initiated; wherein, according to the location information and RSRP change information of the terminal device, it is determined whether the message 3Msg3 of the four-step random access process for initial access of the SDT is initiated or the message A MsgA of the two-step random access process for initial access of the SDT is initiated, including: In response to the location information of the terminal device satisfying a third preset condition and the RSRP change information satisfying a third change condition, MsgA of the two-step random access procedure for initiating the initial access of the SDT; In response to the location information of the terminal device not satisfying the third preset condition, and / or the RSRP change information not satisfying the third change condition, initiating Msg3 of the four-step random access process of initial access of the SDT; The location information of the terminal device satisfies the third preset condition, which includes at least any one of the following: the distance between the terminal device and the network side device is less than the third distance threshold; the RTT between the terminal device and the network side device is less than the third time threshold; the TA value estimated by the terminal device increases by the third threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by the third threshold relative to the currently used TA value; The RSRP change information satisfies the third change condition including: the currently measured downlink path loss reference RSRP value is greater than the third threshold value; The network side device includes any one of the following: a satellite, a ground reference point, a base station, and a reference point between the satellite and the base station.

19. The terminal device according to claim 18, characterized in that: The judgment module is specifically used for: Based on the location information and RSRP change information of the terminal device, determine whether the timing advance TA value used for the SDT is valid.

20. The terminal device according to claim 19, characterized in that: The judgment module is specifically used for: For an SDT using a configured grant resource allocation method, when the location information of the terminal device meets a first preset condition and the RSRP change information meets a first change condition, it is determined that the TA value used for the SDT is valid.

21. The terminal device according to claim 20, characterized in that: The location information of the terminal device satisfies the first preset condition, which includes at least one of the following: The distance between the terminal device and the network side device is increased by a first distance threshold relative to the distance between the terminal device and the network side device obtained or recorded last time; The distance between the terminal device and the network side device is reduced by the first distance threshold relative to the distance between the terminal device and the network side device acquired or recorded last time; The round-trip time RTT between the terminal device and the network side device is increased by a first time threshold relative to the RTT between the terminal device and the network side device obtained or recorded last time; The round-trip time RTT between the terminal device and the network side device is reduced by the first time threshold relative to the RTT between the terminal device and the network side device obtained or recorded last time; The TA value estimated by the terminal device is increased by a first threshold value relative to the currently used TA value; The TA value estimated by the terminal device is reduced by the first threshold value relative to the currently used TA value.

22. The terminal device according to claim 20, characterized in that: The RSRP change information satisfies a first change condition, including: An absolute value of a difference between a currently measured downlink path loss reference RSRP value and a stored downlink path loss reference RSRP value is smaller than a first threshold value.

23. The terminal device according to claim 18, characterized in that: The judgment module is specifically used for: Whether to initiate small data transmission SDT is determined according to the location information and RSRP change information of the terminal device.

24. The terminal device according to claim 23, characterized in that: The judgment module is specifically used for: Determining whether the location information of the terminal device meets a second preset condition; Determining whether the RSRP change information satisfies a second change condition; In response to the location information of the terminal device satisfying the second preset condition and the RSRP change information satisfying the second change condition, the SDT is initiated.

25. The terminal device according to claim 24, characterized in that: The location information of the terminal device satisfies at least one of the following conditions: The distance between the terminal device and the network side device is less than a second distance threshold; The RTT between the terminal device and the network side device is less than a second time threshold; The TA value estimated by the terminal device is increased by a second threshold value relative to the currently used TA value; The TA value estimated by the terminal device is reduced by the second threshold relative to the currently used TA value.

26. The terminal device according to claim 24, characterized in that: The RSRP change information satisfies the second change condition, including: The currently measured downlink path loss reference RSRP value is greater than the second threshold value.

27. The terminal device according to claim 18, characterized in that: The judgment module is specifically used for: According to the location information and RSRP change information of the terminal device, it is determined whether to initiate the SDT on the supplementary uplink SUL or the normal uplink NUL.

28. The terminal device according to claim 27, characterized in that: The judgment module is specifically used for: Determining whether the location information of the terminal device meets a fifth preset condition; Determining whether the RSRP change information satisfies a fourth change condition; In response to the location information of the terminal device satisfying the fifth preset condition and the RSRP change information satisfying the fourth change condition, initiating the SDT on the NUL; In response to the location information of the terminal device not satisfying the fifth preset condition, and / or the RSRP change information not satisfying the fourth change condition, initiating the SDT on the SUL; The location information of the terminal device satisfies the fifth preset condition, which includes at least one of the following: the distance between the terminal device and the network side device is less than the fifth distance threshold; the RTT between the terminal device and the network side device is less than the fifth time threshold; The RSRP change information satisfying the fourth change condition includes: The currently measured downlink path loss reference RSRP value is greater than the fourth threshold value.

29. The terminal device according to claim 27, characterized in that: The judgment module is specifically used for: Determining whether the location information of the terminal device meets a sixth preset condition; Determining whether the RSRP change information satisfies a fifth change condition; In response to the location information of the terminal device satisfying the sixth preset condition and the RSRP change information satisfying the fifth change condition, initiating the SDT on the SUL; In response to the location information of the terminal device not satisfying the sixth preset condition, and / or the RSRP change information not satisfying the fifth change condition, initiating the SDT on the NUL; The location information of the terminal device satisfies the sixth preset condition, which includes at least one of the following: the distance between the terminal device and the network side device is greater than the sixth distance threshold; the RTT between the terminal device and the network side device is greater than the sixth time threshold; The RSRP change information satisfying the fifth change condition includes: The currently measured downlink path loss reference RSRP value is less than the fifth threshold value.

30. The terminal device according to claim 18, characterized in that: The judging module is also used for: When a timer is started after transmission on a dedicated physical uplink shared channel PUSCH resource configured by the network, enhanced processing is performed on the timer.

31. The terminal device according to claim 30, characterized in that: The judgment module is specifically used for: offsetting the start time of the timer by an RTT between the terminal device and the base station; Alternatively, the value of the timer is increased by an RTT between the terminal device and the base station.

32. The terminal device according to claim 30 or 31, characterized in that: The timer is any one of the following: A configuration authorization timer of the SDT; The configuration authorization retransmission timer of the SDT; A preset timer, wherein the preset timer is used to indicate that the terminal device automatically retransmits after the preset timer times out, or waits for feedback from the base station during the operation of the preset timer.

33. The terminal device according to claim 32, characterized in that: The preset timer is a dedicated physical uplink shared channel PUSCH resource configured by the network.

34. A network side device, characterized in that: The network side device is used for SDT processing of a non-terrestrial network, and the network side device includes: A transceiver module, the transceiver module is used to receive an SDT random access request sent by a terminal device; wherein the SDT random access request carries a small data transmission indication, and the small data transmission indication is used to inform the network side device that wireless access signaling will be used to carry a small data packet; The transceiver module is further used to send a random access response to the terminal device in response to the SDT random access request; the random access response carries the uplink configuration authorization resources and threshold configuration information allocated to the terminal device, wherein the threshold configuration information is used by the terminal device as a basis for judging the SDT transmission condition when judging the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information; wherein the judgment of the SDT transmission condition includes at least one of the following: Determining whether a timing advance TA value used for the SDT is valid; Determine whether to initiate small data transmission SDT; Determine whether it is message 3 Msg3 of the four-step random access process for initiating the initial access of the SDT, or message A MsgA of the two-step random access process for initiating the initial access of the SDT; Determine whether to initiate the SDT on a supplementary uplink SUL or a normal uplink NUL; The determining of the SDT transmission condition according to the location information of the terminal device and the reference signal received power RSRP change information includes: According to the location information and RSRP change information of the terminal device, it is determined whether the message 3Msg3 of the four-step random access process for initial access of the SDT is initiated or the message AMsgA of the two-step random access process for initial access of the SDT is initiated; wherein, according to the location information and RSRP change information of the terminal device, it is determined whether the message 3Msg3 of the four-step random access process for initial access of the SDT is initiated or the message A MsgA of the two-step random access process for initial access of the SDT is initiated, including: In response to the location information of the terminal device satisfying a third preset condition and the RSRP change information satisfying a third change condition, initiating MsgA of a two-step random access process for initial access of the SDT; In response to the location information of the terminal device not satisfying the third preset condition, and / or the RSRP change information not satisfying the third change condition, initiating Msg3 of the four-step random access process of initial access of the SDT; The location information of the terminal device satisfies the third preset condition, which includes at least any one of the following: the distance between the terminal device and the network side device is less than the third distance threshold; the RTT between the terminal device and the network side device is less than the third time threshold; the TA value estimated by the terminal device increases by the third threshold relative to the currently used TA value; the TA value estimated by the terminal device decreases by the third threshold relative to the currently used TA value; The RSRP change information satisfies the third change condition including: the currently measured downlink path loss reference RSRP value is greater than the third threshold value; The network side device includes any one of the following: a satellite, a ground reference point, a base station, and a reference point between the satellite and the base station.

35. A communication device, characterized in that: The communication device comprises a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program stored in the memory so that the communication device performs the method according to any one of claims 1 to 16.

36. A communication device, characterized in that: The communication device comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program stored in the memory to enable the communication device to perform the method according to claim 17.

37. A computer-readable storage medium storing instructions, which, when executed, enable the method according to any one of claims 1 to 16 to be implemented.

38. A computer-readable storage medium storing instructions, which, when executed, enable the method of claim 17 to be implemented.

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