CN-122002553-A - Timing advance estimation method and device

Abstract

The application provides a timing advance estimation method and a timing advance estimation device, which are applied to terminal UE. According to the timing advance estimation method and device provided by the application, before conditional LTM switching, the UE acquires the timing advance TA of the candidate cell, so that the situation that the UE cannot acquire the neighbor cell TA in the conditional LTM switching is avoided, and the switching time delay is reduced.

Inventors

• LUO YAJUAN
• LI HUI
• DA REN
• GAO QIUBIN

Assignees

• 大唐移动通信设备有限公司

Dates

Publication Date

20260508

Application Date

20241108

Claims (20)

1. 1. A timing advance estimation method, applied to a terminal UE, comprising: Determining that the current state is before switching; the timing advance TA of the candidate cell is acquired.
2. 2. The timing advance estimation method of claim 1 wherein obtaining the timing advance TA of the candidate cell comprises: the method comprises the steps of sending a request message to a service cell, wherein the request message is used for indicating that the UE requests to acquire the TA of a candidate cell; Acquiring a positive response message sent by the service cell; transmitting a preamble sequence to the candidate cell, wherein the preamble sequence is used for estimating the TA of the candidate cell; And acquiring the TA of the candidate cell sent by the service cell.
3. 3. The timing advance estimation method of claim 2, wherein the request message includes one or more of the following information: The indication information of TA needs to be obtained; beam measurement information for the candidate cell; Identification information of the candidate cell.
4. 4. The timing advance estimation method of claim 2, further comprising: the candidate cell is determined based on beam measurements and execution conditions of a conditional layer 1/layer 2 triggered mobility LTM.
5. 5. The timing advance estimation method of claim 2, wherein the request message may be carried by one or more of the following messages: Measurement report MR; scheduling request SR; Uplink control information UCI.
6. 6. The timing advance estimation method of claim 1 wherein obtaining the timing advance TA of the candidate cell comprises: Transmitting a preamble sequence on a physical random access channel PRACH resource of a pre-configured candidate cell, wherein the preamble sequence is used for estimating TA of the candidate cell; acquiring a TA of a serving cell or a candidate cell transmitted by the candidate cell; the TA of the candidate cell is carried by one or more of the following messages; a random access response, RAR, message; The medium access control unit MAC CE message.
7. 7. The timing advance estimation method of claim 6, further comprising: And acquiring PRACH resources of the candidate cell configured by the network equipment.
8. 8. The timing advance estimation method of claim 1 wherein obtaining the timing advance TA of the candidate cell comprises: Acquiring a TA of a serving cell; updating the TA of the candidate cell based on the TA of the service cell to obtain the updated TA of the candidate cell.
9. 9. The timing advance estimation method of claim 8, further comprising: And reporting capability information to the network equipment, wherein the capability information is used for indicating the maximum value of the number of TAs which can be maintained by the UE.
10. 10. The timing advance estimation method of claim 8, further comprising: And acquiring the identification of the candidate cell which is transmitted by the network equipment and needs to update the TA.
11. 11. The timing advance estimation method of claim 8 wherein updating the TA of the candidate cell based on the TA of the serving cell comprises: acquiring a first time delay of a reference signal transmitted by the service cell and a second time delay of the reference signal transmitted by the candidate cell; Determining a delay difference between the first delay and the second delay; updating the TA of the candidate cell based on the TA of the serving cell and the time delay difference.
12. 12. A terminal comprising a memory, a transceiver, and a processor; the system comprises a memory for storing a computer program, a transceiver for receiving and transmitting data under the control of the processor, and a processor for reading the computer program in the memory and performing the following operations: Determining that the current state is before switching; the timing advance TA of the candidate cell is acquired.
13. 13. The terminal of claim 12, wherein obtaining the timing advance, TA, for the candidate cell comprises: the method comprises the steps of sending a request message to a service cell, wherein the request message is used for indicating that the UE requests to acquire the TA of a candidate cell; Acquiring a positive response message sent by the service cell; transmitting a preamble sequence to the candidate cell, wherein the preamble sequence is used for estimating the TA of the candidate cell; And acquiring the TA of the candidate cell sent by the service cell.
14. 14. The terminal of claim 13, wherein the request message includes one or more of the following information: The indication information of TA needs to be obtained; beam measurement information for the candidate cell; Identification information of the candidate cell.
15. 15. The terminal of claim 13, wherein the processor is further configured to read the computer program in the memory and perform the following: the candidate cell is determined based on beam measurements and execution conditions of a conditional layer 1/layer 2 triggered mobility LTM.
16. 16. The terminal of claim 13, wherein the request message may be carried by one or more of the following messages: Measurement report MR; scheduling request SR; Uplink control information UCI.
17. 17. The terminal of claim 12, wherein obtaining the timing advance, TA, for the candidate cell comprises: Transmitting a preamble sequence on a physical random access channel PRACH resource of a pre-configured candidate cell, wherein the preamble sequence is used for estimating TA of the candidate cell; acquiring a TA of a serving cell or a candidate cell transmitted by the candidate cell; the TA of the candidate cell is carried by one or more of the following messages; a random access response, RAR, message; The medium access control unit MAC CE message.
18. 18. The terminal of claim 17, wherein the processor is further configured to read the computer program in the memory and perform the following: And acquiring PRACH resources of the candidate cell configured by the network equipment.
19. 19. The terminal of claim 12, wherein obtaining the timing advance, TA, for the candidate cell comprises: Acquiring a TA of a serving cell; updating the TA of the candidate cell based on the TA of the service cell to obtain the updated TA of the candidate cell.
20. 20. The terminal of claim 19, wherein the processor is further configured to read the computer program in the memory and perform the following: And reporting capability information to the network equipment, wherein the capability information is used for indicating the maximum value of the number of TAs which can be maintained by the UE.

Description

Timing advance estimation method and device Technical Field The present application relates to the field of mobile communications technologies, and in particular, to a method and apparatus for estimating a timing advance (TIMING ADVANCE, TA). Background In the related art, TA acquisition in layer 1/layer 2 triggered mobility (L1/L2-TRIGGERED MOBILITY, LTM) management is controlled by a base station, which transmits a physical downlink control channel (Physical Downlink Control Channel, PDCCH) command (order) to a terminal/User Equipment (UE) to trigger the UE to transmit a preamble sequence on a Random access channel (Random ACCESS CHANNEL, RACH) toward a neighboring cell, and transmits TA estimated by the neighboring cell and a cell handover command to the UE through a medium access control unit (MEDIA ACCESS Control Control Element, MAC CE). However, in the conditional LTM, the UE performs beam measurement of a plurality of candidate cells and determines whether or not the measurement result satisfies a cell handover condition, and if the handover condition is satisfied, the UE performs autonomous cell handover. In this process, how to perform TA acquisition has not been solved. Disclosure of Invention The application provides a timing advance estimation method and a timing advance estimation device, which are used for solving the technical problem of large switching delay caused by the fact that UE (user equipment) in a conditional LTM (Low traffic control) in the related art cannot acquire neighbor cell TA. In a first aspect, the present application provides a timing advance estimation method, applied to a terminal UE, including: Determining that the current state is before switching; the timing advance TA of the candidate cell is acquired. In some embodiments, acquiring the timing advance, TA, of the candidate cell includes: the method comprises the steps of sending a request message to a service cell, wherein the request message is used for indicating that the UE requests to acquire the TA of a candidate cell; Acquiring a positive response message sent by the service cell; transmitting a preamble sequence to the candidate cell, wherein the preamble sequence is used for estimating the TA of the candidate cell; And acquiring the TA of the candidate cell sent by the service cell. In some embodiments, the request message includes one or more of the following information: The indication information of TA needs to be obtained; beam measurement information for the candidate cell; Identification information of the candidate cell. In some embodiments, the method further comprises: the candidate cell is determined based on beam measurements and execution conditions of a conditional layer 1/layer 2 triggered mobility LTM. In some embodiments, the request message may be carried by one or more of the following messages: Measurement report MR; scheduling request SR; Uplink control information UCI. In some embodiments, acquiring the timing advance, TA, of the candidate cell includes: Transmitting a preamble sequence on a physical random access channel PRACH resource of a pre-configured candidate cell, wherein the preamble sequence is used for estimating TA of the candidate cell; acquiring a TA of a serving cell or a candidate cell transmitted by the candidate cell; the TA of the candidate cell is carried by one or more of the following messages; a random access response, RAR, message; The medium access control unit MAC CE message. In some embodiments, the method further comprises: And acquiring PRACH resources of the candidate cell configured by the network equipment. In some embodiments, acquiring the timing advance, TA, of the candidate cell includes: Acquiring a TA of a serving cell; updating the TA of the candidate cell based on the TA of the service cell to obtain the updated TA of the candidate cell. In some embodiments, the method further comprises: And reporting capability information to the network equipment, wherein the capability information is used for indicating the maximum value of the number of TAs which can be maintained by the UE. In some embodiments, the method further comprises: And acquiring the identification of the candidate cell which is transmitted by the network equipment and needs to update the TA. In some embodiments, the updating the TA of the candidate cell based on the TA of the serving cell includes: acquiring a first time delay of a reference signal transmitted by the service cell and a second time delay of the reference signal transmitted by the candidate cell; Determining a delay difference between the first delay and the second delay; updating the TA of the candidate cell based on the TA of the serving cell and the time delay difference. In a second aspect, the present application provides a terminal comprising a memory, a transceiver, and a processor; the system comprises a memory for storing a computer program, a transceiver for receiving and transmitting data under the control o