Radio link failure detection method and apparatus for wireless communication system
A radio link failure detection method of a user equipment transitioning between a Discontinuous Reception (DRX) mode and non-DRX mode cyclically in a wireless communication system includes transitioning between a Discontinuous Reception (DRX) mode and a non-DRX mode in a wireless communication system. The method also includes adjusting, when a mode transition occurs, a size of a monitoring window for a transitioned operation mode; reporting a radio channel condition acquired by monitoring and averaging the channel condition within the monitoring window; and repeating adjustment of the monitoring window size and report of the radio channel condition while moving the monitoring window as time progress.
1. A method for monitoring a radio link by a terminal in a wireless communication system, the method comprising:
estimating a radio link condition based on channel conditions measured during a first evaluation period in a first reception mode;
for a duration of time after transitioning from the first reception mode to a second reception mode, estimating a radio link condition based on channel conditions measured during an evaluation period, the evaluation period used during the duration of time in the second reception mode; and
estimating a radio link condition based on channel conditions measured during a second evaluation period in the second reception mode, after the duration of time,
wherein the duration of time is equal to the second evaluation period.
2. The method of claim 1 , wherein the first reception mode is one of a Discontinuous Reception (DRX) mode and a non-DRX mode and the reception second mode is another of the DRX mode and the non-DRX mode.
3. The method of claim 2 , wherein the evaluation period is not less than a minimum of the first evaluation period and the second evaluation period.
4. The method of claim 1 , wherein, if the first reception mode is a non-DRX mode, a length of the first evaluation period is a preset value.
5. The method of claim 1 , wherein a length of the first evaluation period is 200 milliseconds (ms).
6. The method of claim 1 , wherein a length of the first evaluation period or the second evaluation period is defined as M cycles times a DRX cycle length, wherein M is an integer.
7. The method of claim 6 , wherein the M cycles denote an elapse of time sufficient to determine a complete transition from the first reception mode to the second reception mode.
8. The method of claim 1 , wherein the evaluation period is an arbitrary value plus a minimum among the first evaluation period and the second evaluation period.
9. A terminal for monitoring a radio link in a wireless communication system, the terminal comprising:
a transceiver configured to transmit and receive a signal; and
at least one processor configured:
to estimate a radio link condition based on channel conditions measured during a first evaluation period in a first reception mode,
for a duration of time after transitioning from the first reception mode to a second reception mode, to estimate a radio link condition based on channel conditions measured during an evaluation period, the evaluation period used during the duration of time in the second reception mode, and
to estimate a radio link condition based on channel conditions measured during a second evaluation period in the second reception mode, after the duration of time,
wherein the duration of time is equal to the second evaluation period.
10. The terminal of claim 9 , wherein the first reception mode is one of a Discontinuous Reception (DRX) mode and a non-DRX mode and the second reception mode is another of the DRX mode and the non-DRX mode.
11. The terminal of claim 10 , wherein the evaluation period is not less than a minimum of the first evaluation period and the second evaluation period.
12. The terminal of claim 9 , wherein, if the first reception mode is a non-DRX mode, a length of the first evaluation period is a preset value.
13. The terminal of claim 9 , wherein a length of the first evaluation period is 200 milliseconds (ms).
14. The terminal of claim 9 , wherein a length of the first evaluation period or the second evaluation period is defined as M cycles times a DRX cycle length, wherein M is an integer.
15. The terminal of claim 14 , wherein the M cycles denote an elapse of time sufficient to determine a complete transition from the first reception mode to the second reception mode.
16. The terminal of claim 9 , wherein the evaluation period is an arbitrary value plus a minimum among the first evaluation period and the second evaluation period.