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EP-4319331-B1 - ADJUSTING METHOD AND DETERMINING METHOD FOR TRANSMISSION TIMING, AND TERMINAL DEVICE

EP4319331B1EP 4319331 B1EP4319331 B1EP 4319331B1EP-4319331-B1

Inventors

  • WU, ZUOMIN

Dates

Publication Date
20260506
Application Date
20210330

Claims (14)

  1. A transmission timing adjustment method, applied to a non-terrestrial network, NTN, system, wherein the method is performed by a terminal device, and the method comprises: acquiring (S210) first Timing Advance, TA, information, the first TA information is estimated by the terminal device; and adjusting (S220) a first uplink TA value according to the first TA information to obtain a second uplink TA value; wherein if two adjacent time slots overlap due to adjusting the first uplink TA value according to the first TA information, a length of a later one of the two adjacent time slots is reduced relative to an earlier one of the two adjacent time slots; wherein the first TA information being estimated by the terminal device comprises: the first TA information being estimated by the terminal device based on at least one of: a velocity of a satellite, a position of the satellite, ephemeris information, a timestamp, a position of the terminal device, and Global Navigation Satellite System, GNSS.
  2. The method according to claim 1, wherein the first TA information comprises at least one of a first TA value and first TA variation information; and the first TA variation information is used to measure variation of the first TA value within a unit of time.
  3. The method according to any one of claims 1 to 2, further comprising: not expecting, by the terminal device, to adjust the first uplink TA value according to the first TA information during uplink transmission, wherein the uplink transmission comprises scheduled continuous uplink transmissions of the terminal device.
  4. The method according to any one of claims 1 to 3, further comprising: not expecting, by the terminal device, a length of scheduled continuous uplink transmissions to be greater than or equal to a second threshold; or allowing, by the terminal device, the length of the scheduled continuous uplink transmissions to be smaller than or equal to the second threshold.
  5. The method according to any one of claims 1 to 4, wherein when a downlink reference timing of the terminal device changes and is not compensated, or when the downlink reference timing of the terminal device changes and is partially compensated without receiving a TA command, the terminal device adjusts the first TA information; or the terminal device adjusts the first uplink TA value according to the first TA information; or the terminal device adjusts the second uplink TA value according to the first TA information.
  6. The method according to any one of claims 1 to 5, wherein when the terminal device does not receive TA indication information transmitted by a network device or does not acquire second TA information, the terminal device adjusts the first uplink TA value according to the first TA information.
  7. The method according to claim 1, wherein the reduced length is equal to a length of an overlapping portion of the two adjacent time slots.
  8. The method according to any one of claims 1 to 7, further comprising: performing uplink transmission by applying the second uplink TA value in an uplink time unit n+m+1, where n represents an uplink time unit for acquiring or estimating the first TA information, and m is a number greater than or equal to 0; wherein the uplink time unit comprises one of following: a time slot, a subframe, a symbol and a resource unit.
  9. The method according to any one of claims 1 to 8, further comprising: determining, based on an overlapping status of two adjacent time slots due to adjusting the first uplink TA value according to the first TA information, an uplink time unit in which the second uplink TA value is applied for uplink transmission.
  10. The method according to claim 9, wherein when the two adjacent time slots overlap due to adjusting the first uplink TA value according to the first TA information, the terminal device performs uplink transmission by applying the second uplink TA value after the ongoing uplink transmission ends; or when adjusting the first uplink TA value according to the first TA information leads to no overlapping of two adjacent time slots, the terminal device performs uplink transmission by applying the second uplink TA value in an uplink time unit n+m+1, where n represents an uplink time unit for acquiring or estimating the first TA information, and m is a number greater than or equal to 0.
  11. The method according to any one of claims 1, 7, 9, and 10, wherein the two adjacent time slots comprise a first time slot and a second time slot, wherein the first time slot is a first time slot in which the second uplink TA value is applied, and the second time slot is an adjacent time slot before the first time slot.
  12. The method according to any one of claims 1 to 11, wherein said acquiring (S210) the first TA information comprises: acquiring the first TA information according to a first subcarrier spacing.
  13. A terminal device (600), comprising: a processor (610), and a memory (620) that stores a computer program, wherein the processor (610) is configured to invoke and execute the computer program stored in the memory (620) to perform the method according to any one of claims 1 to 12.
  14. A computer-readable storage medium, having a computer program stored thereon, the computer program causing a computer to perform the method according to any one of claims 1 to 12.

Description

TECHNICAL FIELD The embodiments of the present disclosure relate to the field of communication, and more particularly, to an adjustment method for transmission timing, a terminal device and a computer-readable storage medium. BACKGROUND In a New Radio-Non Terrestrial Network (NR-NTN) system, similar to a New Radio (NR) system, a User Equipment (UE) needs to consider impact of Timing Advance (TA) when performing uplink transmission. However, in the terrestrial communication system, a propagation delay of signal communication is usually less than 1ms. In the NR-NTN system, due to a long communication distance between a terminal device and a satellite (or network device), the propagation delay of signal communication is very large, which may range from tens of milliseconds to hundreds of milliseconds, depending on the altitude of the satellite orbit and the traffic type of satellite communication. Based on this, in order to deal with a relatively large propagation delay, the scheme related to the transmission timing of the NR-NTN system needs to be enhanced compared with the NR system. In addition, since the position of the satellite changes in real time, the transmission timing adjustment method for the NR system is not suitable for the NTN system. Therefore, it is desired that the present disclosure needs a transmission timing adjustment method for the NTN system. 3GPP DRAFT, R1-2100927, ERICSSON: "On UL time and frequency synchronization enhancements for NTN" discloses that the purpose of the UE-specific TA is to compensate for the RTT of the service link. The UE-specific TA is autonomously determined by the UE based on GNSS-acquired UE position and serving satellite position from broadcast ephemeris. Proposal 4: the TA to be used by NTN UE in RRC_IDLE, RRC _INACTIVE and RRC _CONNECTED states should be as follows: TTA=(NTA+NTA,offset+NTA,UE-specific+NT4,common)×Tc. Document 3GPP DRAFT R1-2100977: "Timing relationship enhancements to NB-IoT in NTN", ASIA PACIFIC TELECOM ET AL (2021-01-19) discloses a transmission timing adjustment method according to the prior art. SUMMARY In a first aspect, an embodiment of the present disclosure provides a transmission timing adjustment method, which is defined in claim 1. In a second aspect, an embodiment of the present disclosure provides a terminal device, which is defined in claim 13. In a third aspect, an embodiment of the present disclosure provides a computer-readable storage medium, which is defined in claim 14. Further advantageous embodiments of the present disclosure are indicated in the dependent claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary only, and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 to FIG. 3 are schematic block diagrams of system frameworks provided by embodiments of the present disclosure;FIG. 4 and FIG. 5 respectively show schematic diagrams of NTN scenarios based on a transparent payload satellite and a regenerative payload satellite;FIG. 6 is a schematic structural diagram of Case 1 in a timing relationship of an NTN system provided by an embodiment of the present disclosure;FIG. 7 is a schematic structural diagram of Case 2 in a timing relationship of an NTN system provided by an embodiment of the present disclosure;FIG. 8 is a schematic diagram of a timing relationship between a downlink frame and an uplink frame of a terminal device in an NR system provided by an embodiment of the present disclosure;FIG. 9 is a schematic diagram of adjusting NTA when a downlink reference timing changes in an NR system provided by an embodiment of the present disclosure;FIG. 10 is a schematic flowchart of a transmission timing adjustment method provided by an embodiment of the present disclosure;FIG. 11 is a schematic diagram of a timing relationship between a downlink frame and an uplink frame of a terminal device in an NTN system provided by an embodiment of the present disclosure;FIG. 12 is a schematic diagram of overlapping of two adjacent time slots due to adjusting a first uplink TA value according to first TA information according to an embodiment of the present disclosure;FIG. 13 is a schematic diagram of no overlapping of two adjacent time slots due to adjusting a first uplink TA value according to first TA information provided by an embodiment of the present disclosure;FIG. 14 is a schematic comparison diagram before and after adjustment of a first uplink TA value by a terminal device according to first TA information according to an embodiment of the present disclosure;FIG. 15 is an example of reducing a length of a later time slot among two adjacent time slots provided by an embodiment of the present disclosure;FIG. 16 is an exemplary flowchart of a transmission timing determination method provided by an embodiment of the present disclosure;FIG. 17 and FIG. 18 are schematic block diagrams of terminal devices according to embodi