Method for monitoring radio link and terminal device

1. A method for wireless link monitoring (RLM), wherein the method comprises:

starting, by a terminal device, a timer T 310 , when a number of out of sync (OOS) indications continuously received by the terminal device exceeds a first number N 310 ; and

determining, by the terminal device, whether to stop the timer T 310 before the timer T 310 expires, according to a number of in sync (IS) indications received after the timer T 310 is started or according to a proportional relation between the IS indication and the OOS indication received after the timer T 310 is started,

wherein the method further comprises:

stopping, by the terminal device, the timer T 310 , if a ratio of the number of the IS indications to the number of the OOS indications is greater than or equal to a first threshold; and/or

stopping, by the terminal device, the timer T 310 , if a ratio of the number of the IS indications to a total number of the IS indications and the OOS indications is greater than or equal to a second threshold; and/or

stopping, by the terminal device, the timer T 310 , if a ratio of the number of the OOS indications to the number of the IS indications is less than or equal to a third threshold; and/or

stopping, by the terminal device, the timer T 310 , if a ratio of the number of the OOS indications to the total number of the IS indications and the OOS indications is less than or equal to a fourth threshold,

wherein the method further comprises:

determining, by the terminal device, whether a radio link failure (RLF) occurs when the timer T 310 expires, according to the number of the in sync (IS) indications received after the timer T 310 is started or according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started.

2. The method according to claim 1 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started, comprises:

determining, by the terminal device, whether the total number of the IS indications and the OOS indications reaches a fifth threshold; and

determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication, if the total number of the IS indications and the OOS indications reaches the fifth threshold.

3. The method according to claim 1 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started, comprises:

determining, by the terminal device, whether a running time of the timer T 310 reaches a predetermined time duration; and

determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication, If the running time of the timer T 310 reaches the predetermined time duration.

4. The method according to claim 1 , wherein the method further comprises:

updating, by the terminal device, the number of the IS indications and the number of the OOS indications received after the timer T 310 is started, based on a time duration, and determining whether to stop the timer T 310 according to an updated proportional relation between the IS indication and the OOS indication,

wherein updating, by the terminal device, the number of the IS indications and the number of the OOS indications received after the timer T 310 is started, based on the time duration, comprises:

updating, by terminal device, the number of the IS indications and the number of the OOS indications received after the timer T 310 is started, every time a time duration T 1 has passed.

5. The method according to claim 1 , wherein the method further comprises:

updating, by the terminal device, the number of the IS indications and the number of the OOS indications received after the timer T 310 is started, based on the IS indication and the OOS indication, and determining whether to stop the timer T 310 according to an updated proportional relation between the IS indication and the OOS indication,

wherein updating, by the terminal device, the number of the IS indications and the number of the OOS indications received after the timer T 310 is started, based on the IS indication and the OOS indication, comprises:

updating, by the terminal device, the numbers of the IS indications and the OOS indications received after the timer T 310 is started, every time a number of M of the IS indications and the OOS indications are received newly, wherein M is a positive integer.

6. The method according to claim 1 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started, comprises:

determining, by the terminal device, whether to stop the timer T 310 in each of time periods T 2 , according to the proportional relation between the IS indication and the OOS indication received in each of the time periods T 2 ; or

determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication in a number of N of the IS indications and the OOS indications newly received, every time the number of N of the IS indications and the OOS indications are received newly, wherein N is a positive integer.

7. The method according to claim 1 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started, comprises:

determining, by the terminal device, a sliding window, wherein the sliding window comprises the IS indication and the OOS indication received the most recent K times, or the sliding window comprises the IS indication and the OOS indication received within the most recent time length T 3 , and K is a positive integer; and

determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication received in the sliding window.

8. The method according to claim 1 , wherein when or after the timer T 310 is started by the terminal device, the method further comprises:

starting a first timer by the terminal device, and

wherein determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started, comprises:

determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication, when the first timer expires.

9. The method according to claim 1 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the number of the IS indications received after the timer T 310 is started, comprises:

stopping the timer T 310 by the terminal device, if the number of the IS indications reaches a sixth threshold.

10. The method according to claim 9 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the number of the IS indications received after the timer T 310 is started, comprises:

determining, by the terminal device, whether to stop the timer T 310 in each of time periods T 2 , according to the number of the IS indications received in each of the time periods T 2 ; or

determining, by the terminal device, whether to stop the timer T 310 according to the number of the IS indications in a number of N of the IS indications and the OOS indications newly received, every time the number of N of the IS indications and the OOS indications are received newly, wherein N is a positive integer.

11. The method according to claim 9 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the number of the IS indications received after the timer T 310 is started, comprises:

determining, by the terminal device, a sliding window, wherein the sliding window comprises the IS indication and the OOS indication received the most recent K times, or the sliding window comprises the IS indication and the OOS indication received within the most recent time length T 3 , and K is a positive integer; and

determining, by the terminal device, whether to stop the timer T 310 according to the number of the IS indications received in the sliding window.

12. The method according to claim 9 , wherein when or after the timer T 310 is started by the terminal device, the method further comprises:

starting a second timer by the terminal device, and

wherein determining, by the terminal device, whether to stop the timer T 310 according to the number of the IS indications received after the timer T 310 is started, comprises:

determining, by the terminal device, stopping the timer T 310 before the second timer expires, if the number of the IS indications reaches the sixth threshold.

13. The method according to claim 1 , wherein determining, by the terminal device, whether the RLF occurs according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started, comprises:

determining, by the terminal device, that the RLF does not occur, if a ratio of the number of the IS indications to the number of the OOS indications is greater than or equal to a first threshold; and/or

determining, by the terminal device, that the RLF does not occur, if a ratio of the number of the IS indications to a total number of the IS indications and the OOS indications is greater than or equal to a second threshold; and/or

determining, by the terminal device, that the RLF does not occur, if a ratio of the number of the OOS indications to the number of the IS indications is less than or equal to a third threshold; and/or

determining, by the terminal device, that the RLF does not occur, the timer T 310 , if a ratio of the number of the OOS indications to the total number of the IS indications and the OOS indications is less than or equal to a fourth threshold.

14. A terminal device, wherein the terminal device comprises:

a memory, storing computer programs; and

a processor, configured to call and run the computer programs stored in the memory to execute a method for wireless link monitoring (RLM), comprising:

starting, by a terminal device, a timer T 310 , when a number of out of sync (OOS) indications continuously received by the terminal device exceeds a first number N 310 ; and

determining, by the terminal device, whether to stop the timer T 310 before the timer T 310 expires, according to a number of in sync (IS) indications received after the timer T 310 is started or according to a proportional relation between the IS indication and the OOS indication received after the timer T 310 is started,

wherein the method further comprises:

stopping, by the terminal device, the timer T 310 , if a ratio of the number of the IS indications to the number of the OOS indications is greater than or equal to a first threshold; and/or

stopping, by the terminal device, the timer T 310 , if a ratio of the number of the IS indications to a total number of the IS indications and the OOS indications is greater than or equal to a second threshold; and/or

stopping, by the terminal device, the timer T 310 , if a ratio of the number of the OOS indications to the number of the IS indications is less than or equal to a third threshold; and/or

stopping, by the terminal device, the timer T 310 , if a ratio of the number of the OOS indications to the total number of the IS indications and the OOS indications is less than or equal to a fourth threshold,

wherein the method further comprises:

determining, by the terminal device, whether a radio link failure (RLF) occurs when the timer T 310 expires, according to the number of the in sync (IS) indications received after the timer T 310 is started or according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started.

15. The terminal device according to claim 14 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started, comprises:

determining, by the terminal device, whether the total number of the IS indications and the OOS indications reaches a fifth threshold; and

determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication, if the total number of the IS indications and the OOS indications reaches the fifth threshold.

16. The terminal device according to claim 14 , wherein determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication received after the timer T 310 is started, comprises:

determining, by the terminal device, whether a running time of the timer T 310 reaches a predetermined time duration; and

determining, by the terminal device, whether to stop the timer T 310 according to the proportional relation between the IS indication and the OOS indication, If the running time of the timer T 310 reaches the predetermined time duration.