Beam management procedures in wireless networks
A wireless device may increment a beam failure instance counter based on detecting a first beam failure instance associated with one or more first reference signals, RSs, for beam failure detection. The wireless device may receive a medium access control control element, MAC CE, activating one or more second RSs for beam failure detection. The wireless device may resetting the beam failure instance counter in response to receiving the MAC CE. increment the beam failure instance counter based on detecting a second beam failure instance associated with the one or more second RSs. The wireless device may initiate a beam failure recovery based on the beam failure instance counter being equal to or greater than a first value.
1. A method comprising:
incrementing, by a wireless device, a beam failure instance counter based on detecting a first beam failure instance associated with one or more first reference signals (RSs) for beam failure detection;
receiving a medium access control control element (MAC CE) activating 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 detecting a second beam failure instance associated with the one or more second RSs; and
initiating a beam failure recovery based on the beam failure instance counter being equal to or greater than a first value.
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 for candidate beam detection.
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 , wherein:
the detecting the first beam failure instance comprises measuring a first block error rate (BLER) of the one or more first RSs; or
the detecting the second beam failure instance comprises measuring a second BLER of the one or more second RSs.
7. The method of claim 6 , wherein:
the detecting the first beam failure instance 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 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 for beam failure detection.
10. The method of claim 1 , wherein the initiating 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, cause the wireless device to:
increment a beam failure instance counter based on detecting a first beam failure instance associated with one or more first reference signals (RSs) for beam failure detection;
receive a medium access control control element (MAC CE) activating one or more second RS s 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 detecting a second beam failure instance associated with the one or more second RSs; and
initiate a beam failure recovery based on the beam failure instance counter being equal to or greater than a first value.
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 for candidate beam detection.
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 by measuring a first block error rate (BLER) of the one or more first RSs; or
detect the second beam failure instance by measuring a second BLER of the one or more second RSs.
17. The wireless device of claim 16 , wherein the instructions further cause the wireless device to:
detect the first beam failure instance by determining each of the one or more first RSs has a respective first BLER value greater than a first threshold; or
detect the second beam failure instance by determining each of the one or more second RSs has a respective second BLER value greater a second threshold.
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 RS s for beam failure detection.
20. A system comprising:
a base station;
one or more first processors; and
first memory storing first instructions that, when executed by the one or more first processors, cause the base station to transmit a medium access control control element (MAC CE) activating one or more second reference signals (RSs) for beam failure detection; and
a wireless device comprising:
one or more second processors; and
second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to:
increment a beam failure instance counter based on detecting a first beam failure instance associated with one or more first RSs for beam failure detection;
receiving the MAC CE;
reset the beam failure instance counter in response to receiving the MAC CE;
increment the beam failure instance counter based on detecting a second beam failure instance associated with the one or more second RSs; and
initiate a beam failure recovery based on the beam failure instance counter being equal to or greater than a first value.