Timing in beam failure recovery procedure
View Patent ↗A wireless device receives one or more messages comprising configuration parameters. The configuration parameters indicate: a plurality of bandwidth parts (BWPs) comprising a first BWP and a second BWP; and a timer value for a BWP inactivity timer. The BWP inactivity timer associated with the timer value starts in response to switching to the first BWP as an active BWP. A beam failure recovery procedure is initiated based on reaching a number of beam failure instance indications for the first BWP. Based on an expiry of the BWP inactivity timer during the beam failure recovery procedure: the beam failure recovery procedure for the first BWP is aborted; and the active BWP is switched from the first BWP to the second BWP.
1. A method comprising:
receiving, by a wireless device, one or more messages comprising configuration parameters indicating:
a plurality of bandwidth parts (BWPs) comprising a first BWP and a second BWP of a cell; and
a timer value for a BWP inactivity timer;
starting the BWP inactivity timer associated with the timer value in response to switching to the first BWP as an active BWP;
initiating a beam failure recovery procedure based on reaching a number of beam failure instance indications for the first BWP, wherein the initiating the beam failure recovery procedure for the cell comprises transmitting at least one beam failure recovery signal for the beam failure recovery procedure via a physical uplink control channel (PUCCH); and
based on an expiry of the BWP inactivity timer during the beam failure recovery procedure:
aborting the beam failure recovery procedure for the cell initiated via the PUCCH by not transmitting at least one subsequent beam failure recovery signal via the second BWP; and
switching the first BWP to the second BWP as the active BWP.
2. The method of claim 1 , further comprising initiating a random-access procedure based on the switching the first BWP to the second BWP as the active BWP.
3. The method of claim 1 , further comprising transmitting a channel state information (CSI) report for the second BWP based on the switching the first BWP to the second BWP as the active BWP.
4. The method of claim 1 , wherein the first BWP is a non-default BWP.
5. The method of claim 1 , wherein the second BWP is a default BWP.
6. The method of claim 1 , wherein the configuration parameters further indicate a beam failure recovery timer.
7. The method of claim 6 , further comprising starting the beam failure recovery timer based on the initiating the beam failure recovery procedure.
8. The method of claim 6 , further comprising stopping the beam failure recovery timer based on the expiry of the BWP inactivity timer.
9. The method of claim 1 , further comprising stopping monitoring, by the wireless device, at least one downlink control channel of the first BWP based on the switching the first BWP to the second BWP as the active BWP.
10. The method of claim 1 , further comprising starting monitoring, by the wireless device, at least one second downlink control channel of the second BWP based on the switching the first BWP to the second BWP as the active BWP.
11. The method of claim 1 , wherein the configuration parameters further indicate one or more reference signals for the first BWP.
12. The method of claim 11 , wherein the one or more reference signals comprise one or more channel state information reference signals.
13. The method of claim 11 , wherein the one or more reference signals comprise one or more synchronization signal/physical broadcast channel blocks.
14. The method of claim 1 , wherein the configuration parameters further indicate the number of beam failure instance indications for the first BWP.
15. The method of claim 14 , wherein a beam failure instance indication of the beam failure instance indications comprises an assessment of one or more reference signals with radio quality lower than a threshold.
16. The method of claim 15 , wherein the configuration parameters further indicate the threshold.
17. The method of claim 15 , wherein the threshold is based on a hypothetical block error rate.
18. The method of claim 1 , wherein the at least one beam failure recovery signal for the beam failure recovery procedure is transmitted via a PUCCH resource of the PUCCH.