PUCCH based beam failure recovery procedure
A wireless device receives one or more messages comprising one or more configuration parameters indicating: one or more reference signals for a beam failure detection procedure; and a discontinuous reception (DRX) configuration for controlling transitions between a DRX inactive state and a DRX active state. The beam failure detection procedure is performed based on measurements of the one or more reference signals. A first value of a counter is determined based on detecting at least one beam failure instance during the DRX active state. A transition from the DRX active state to the DRX inactive state is made based on the DRX configuration. The beam failure detection procedure is stopped in response to the transitioning. The beam failure detection procedure continues with the first value of the counter after transitioning from the DRX inactive state to the DRX active state.
1. A method comprising:
receiving, by a wireless device, one or more messages comprising one or more configuration parameters indicating:
one or more reference signals for a beam failure detection procedure; and
a discontinuous reception (DRX) configuration for controlling transitions between a DRX inactive state and a DRX active state;
performing the beam failure detection procedure based on measurements of the one or more reference signals;
incrementing, in the DRX active state, a counter of detected beam failure instances to a first value based on detecting at least one beam failure instance during a time period of a beam failure detection timer;
transitioning from the DRX active state to the DRX inactive state based on the DRX configuration;
in response to the transitioning from the DRX active state to the DRX inactive state and during the DRX inactive state spanning a plurality of time periods of the beam failure detection timer:
stopping the measurements of the one or more reference signals for the beam failure detection procedure; and
retaining the first value; and
continuing to perform the beam failure detection procedure with the first value of the counter after transitioning from the DRX inactive state to the DRX active state.
2. The method of claim 1 , wherein the one or more configuration parameters further indicate the beam failure detection timer.
3. The method of claim 2 , further comprising stopping the beam failure detection timer based on transitioning from the DRX active state to the DRX inactive state.
4. The method of claim 2 , further comprising restarting the beam failure detection timer based on transitioning from the DRX inactive state to the DRX active state.
5. The method of claim 2 , further comprising restarting the beam failure detection timer based on transitioning from the DRX active state to the DRX inactive state.
6. The method of claim 2 , further comprising not resetting, during the DRX inactive state, the first value of the counter to zero based on an expiry of the beam failure detection timer in the DRX inactive state.
7. The method of claim 2 , further comprising restarting the beam failure detection timer based on the detecting the at least one beam failure instance.
8. The method of claim 2 , further comprising resetting the first value of the counter to zero based on an expiry of the beam failure detection timer in the DRX active state.
9. The method of claim 1 , wherein the stopping the beam failure detection procedure comprises not providing a beam failure instance indication, by a physical layer of the wireless device, to a medium-access control layer of the wireless device.
10. The method of claim 1 , wherein the performing the beam failure detection procedure comprises assessing a radio link quality of the one or more reference signals.
11. The method of claim 10 , wherein the detecting at least one beam failure instance comprises assessing the radio link quality of the one or more reference signals lower than a threshold.
12. The method of claim 11 , wherein the one or more configuration parameters indicate the threshold.
13. The method of claim 11 , wherein the threshold is based on a hypothetical block error rate.
14. The method of claim 1 , wherein the stopping the beam failure detection procedure comprises not assessing a radio link quality of the one or more reference signals.
15. The method of claim 1 , further comprising providing a beam failure instance indication in the DRX inactive state, by a physical layer of the wireless device to a medium-access control layer of the wireless device, wherein the beam failure instance indication is the same as a previous beam failure instance indication.
16. The method of claim 1 , further comprising providing a beam failure instance indication, by a physical layer of the wireless device, to a medium-access control layer of the wireless device in the DRX inactive state.
17. The method of claim 1 , wherein the one or more configuration parameters further indicate a beam failure instance counter.
18. The method of claim 17 , further comprising initiating a beam failure recovery procedure based on the first value of the counter being equal to or greater than the beam failure instance counter.
19. The method of claim 1 , wherein the one or more reference signals comprise one or more channel state information RSs.
20. The method of claim 1 , wherein the one or more reference signals comprise one or more synchronization signal/physical broadcast channel blocks.