Beam management procedures in wireless networks
A wireless device increments a beam failure instance counter based on a first beam failure instance indication for one or more first reference signals (RSs) for beam failure detection. The wireless device receives a medium access control control element (MAC CE) indicating one or more second RSs for beam failure detection. The wireless device resets the beam failure instance counter in response to receiving the MAC CE. The wireless device increments the beam failure instance counter based on a second beam failure instance indication for the one or more second RSs. The wireless device based on the beam failure instance counter being equal to or greater than a first value, triggers a beam failure recovery for the one or more second RSs.
1. A method comprising:
incrementing, by a wireless device, a beam failure instance counter based on a first beam failure instance indication for one or more first reference signals (RSs) for beam failure detection;
receiving a medium access control control element (MAC CE) indicating one or more second RSs for beam failure detection;
resetting the beam failure instance counter in response to receiving the MAC CE;
incrementing the beam failure instance counter based on a second beam failure instance indication for the one or more second RSs; and
based on the beam failure instance counter being equal to or greater than a first value, triggering a beam failure recovery for the one or more second RSs.
2. The method of claim 1 , further comprising transmitting, for the beam failure recovery, an uplink signal indicating a candidate RS among one or more third RSs used for candidate beam detection.
3. The method of claim 2 , further comprising receiving configuration parameters indicating:
a plurality of reference signals for beam failure detection, wherein the plurality of reference signals comprise the one or more first RSs and the one or more second RSs; and
the one or more third RSs.
4. The method of claim 1 , further comprising receiving configuration parameters indicating the first value.
5. The method of claim 1 , wherein each of the one or more first RSs and each of the one or more second RSs comprises a channel state information reference signal (CSI-RS) or a synchronization signal physical broadcast channel (SS/PBCH block).
6. The method of claim 1 , further comprising:
detecting the first beam failure instance indication based on a first block error rate (BLER) measurement of the one or more first RSs; or
detecting the second beam failure instance indication based on a second BLER measurement of the one or more second RSs.
7. The method of claim 6 , wherein:
the detecting the first beam failure instance indication comprises determining each of the one or more first RSs has a respective first BLER value greater than a first threshold; or
the detecting the second beam failure instance indication comprises determining each of the one or more second RSs has a respective second BLER value greater a second threshold.
8. The method of claim 7 , further comprising receiving configuration parameters indicating the first threshold or the second threshold.
9. The method of claim 1 , wherein the MAC CE indicates deactivation of the one or more first RSs.
10. The method of claim 1 , wherein the triggering the beam failure recovery comprises triggering a random access procedure for the beam failure recovery.
11. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, causes the wireless device to:
increment a beam failure instance counter based on a first beam failure instance indication for one or more first reference signals (RSs) for beam failure detection;
receive a medium access control control element (MAC CE) indicating one or more second RSs for beam failure detection;
reset the beam failure instance counter in response to receiving the MAC CE;
increment the beam failure instance counter based on a second beam failure instance indication for the one or more second RSs; and
based on the beam failure instance counter being equal to or greater than a first value, trigger a beam failure recovery for the one or more second RSs.
12. The wireless device of claim 11 , wherein the instructions further cause the wireless device to transmit, for the beam failure recovery, an uplink signal indicating a candidate RS among one or more third RSs used for candidate beam detection.
13. The wireless device of claim 12 , wherein the instructions further cause the wireless device to receive configuration parameters indicating:
a plurality of reference signals for beam failure detection, wherein the plurality of reference signals comprise the one or more first RSs and the one or more second RSs; and
the one or more third RSs.
14. The wireless device of claim 11 , wherein the instructions further cause the wireless device to receive configuration parameters indicating the first value.
15. The wireless device of claim 11 , wherein each of the one or more first RSs and each of the one or more second RSs comprises a channel state information reference signal (CSI-RS) or a synchronization signal physical broadcast channel (SS/PBCH block).
16. The wireless device of claim 11 , wherein the instructions further cause the wireless device to:
detect the first beam failure instance indication based on a first block error rate (BLER) measurement of the one or more first RSs; or
detect the second beam failure instance indication based on a second BLER measurement of the one or more second RSs.
17. The wireless device of claim 16 , wherein the instructions further cause the wireless device to:
determine each of the one or more first RSs has a respective first BLER value greater than a first threshold, for detecting the first beam failure instance indication; or
determine each of the one or more second RSs has a respective second BLER value greater a second threshold, for detecting the second beam failure instance indication.
18. The wireless device of claim 17 , wherein the instructions further cause the wireless device to receive configuration parameters indicating the first threshold or the second threshold.
19. The wireless device of claim 11 , wherein the MAC CE indicates deactivation of the one or more first RSs.
20. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
increment a beam failure instance counter based on a first beam failure instance indication for one or more first reference signals (RSs) for beam failure detection;
receive a medium access control control element (MAC CE) indicating one or more second RSs for beam failure detection;
reset the beam failure instance counter in response to receiving the MAC CE;
increment the beam failure instance counter based on a second beam failure instance indication for the one or more second RSs; and
based on the beam failure instance counter being equal to or greater than a first value, trigger a beam failure recovery for the one or more second RSs.