Resource selection in beam failure recovery transmissions

1. A method comprising:

determining, by a wireless device, a beam failure of a cell;

determining, for beam failure recovery, a first measurement of a first reference signal (RS) associated with a first candidate beam of the cell and a second measurement of a second RS associated with a second candidate beam of the cell;

based on the beam failure, sending a first preamble corresponding to the first RS;

monitoring, via the first candidate beam, a downlink control channel for downlink control information (DCI); and

after the monitoring and based on the second measurement being greater than a threshold, sending a second preamble corresponding to the second RS.

2. The method of claim 1 , wherein the sending the second preamble is further based on not receiving the DCI during the monitoring.

3. The method of claim 1 , further comprising:

determining, based on the monitoring, unsuccessful reception of the DCI,

wherein the determining the unsuccessful reception of the DCI is performed after the determining the first measurement and the second measurement.

4. The method of claim 1 , wherein the sending the first preamble is further based on at least one of:

the first measurement being greater than the second measurement;

a random selection associated with measurements, of a plurality of reference signals, being greater than the threshold; or

the first measurement being greater than the threshold.

5. The method of claim 1 , wherein the determining the first measurement and the second measurement is performed after the determining the beam failure.

6. The method of claim 1 , further comprising:

selecting, based on the first measurement and the second measurement, the first candidate beam; and

determining, based on the selecting the first candidate beam, to send the first preamble.

7. The method of claim 1 , further comprising:

selecting, based on not receiving the DCI, the second candidate beam; and

determining, based on the selecting the second candidate beam, to send the second preamble.

8. The method of claim 1 , further comprising selecting, based on the first measurement being greater than the second measurement, the first RS for the sending the first preamble.

9. The method of claim 1 , further comprising:

determining a difference between a first transmission time interval (TTI) associated with the first RS and a second TTI associated with the second RS; and

selecting, based on the difference exceeding a second threshold, the second RS for the sending the second preamble.

10. The method of claim 1 , further comprising:

determining a difference between a first frequency associated with the first RS and a second frequency associated with the second RS; and

selecting, based on the difference exceeding a second threshold, the second RS for the sending the second preamble.

11. The method of claim 1 , wherein the determining the second measurement is before the monitoring the downlink control channel for DCI, and

wherein the monitoring the downlink control channel for DCI is based on the sending the first preamble.

12. A method comprising:

determining, by a wireless device, a beam failure of a cell;

determining, for beam failure recovery, a first measurement of a first reference signal (RS) associated with a first candidate beam of the cell and a second measurement of a second RS associated with a second candidate beam of the cell;

based on the beam failure, sending a first preamble corresponding to the first RS;

monitoring, via the first candidate beam, a downlink control channel for downlink control information (DCI); and

based on unsuccessful reception of the DCI and based on the second measurement being greater than a threshold, sending a second preamble corresponding to the second RS.

13. The method of claim 12 , further comprising:

determining the unsuccessful reception of the DCI after the determining the first measurement and the second measurement.

14. The method of claim 12 , wherein the sending the first preamble is further based on at least one of:

the first measurement being greater than the second measurement;

a random selection associated with measurements, of a plurality of reference signals, being greater than the threshold; or

the first measurement being greater than the threshold.

15. The method of claim 12 , wherein the determining the first measurement and the second measurement is performed after the determining the beam failure.

16. The method of claim 12 , wherein the DCI is associated with the first preamble.

17. The method of claim 12 , further comprising:

selecting, based on the first measurement and the second measurement, the first candidate beam; and

determining, based on the selecting the first candidate beam, to send the first preamble.

18. The method of claim 12 , further comprising:

selecting, based on the unsuccessful reception of the DCI, the second candidate beam; and

determining, based on the selecting the second candidate beam, to send the second preamble.

19. The method of claim 12 , further comprising selecting, based on the first measurement being greater than the second measurement, the first RS for the sending the first preamble.

20. The method of claim 12 , further comprising:

determining a difference between a first transmission time interval (TTI) associated with the first RS and a second TTI associated with the second RS; and

selecting, based on the difference exceeding a second threshold, the second RS for the sending the second preamble.

21. The method of claim 12 , further comprising:

determining a difference between a first frequency associated with the first RS and a second frequency associated with the second RS; and

selecting, based on the difference exceeding a second threshold, the second RS for the sending the second preamble.

22. 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:

determine a beam failure of a cell;

determine, for beam failure recovery, a first measurement of a first reference signal (RS) associated with a first candidate beam of the cell and a second measurement of a second RS associated with a second candidate beam of the cell;

based on the beam failure, send a first preamble corresponding to the first RS;

monitor, via the first candidate beam, a downlink control channel for downlink control information (DCI); and

after monitoring the downlink control channel and based on the second measurement being greater than a threshold, send a second preamble corresponding to the second RS.

23. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to send the second preamble further based on not receiving the DCI during monitoring the downlink control channel.

24. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to determine, based on monitoring the downlink control channel, unsuccessful reception of the DCI, and

wherein determining the unsuccessful reception of the DCI is performed after determining the first measurement and the second measurement.

25. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to send the first preamble further based on at least one of:

the first measurement being greater than the second measurement;

a random selection associated with measurements, of a plurality of reference signals, being greater than the threshold; or

the first measurement being greater than the threshold.

26. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to determine the first measurement and the second measurement after determining the beam failure.

27. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

select, based on the first measurement and the second measurement, the first candidate beam; and

determine, based on selecting the first candidate beam, to send the first preamble.

28. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

select, based on not receiving the DCI, the second candidate beam; and

determine, based on selecting the second candidate beam, to send the second preamble.

29. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to select, based on the first measurement being greater than the second measurement, the first RS for sending the first preamble.

30. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

determine a difference between a first transmission time interval (TTI) associated with the first RS and a second TTI associated with the second RS; and

select, based on the difference exceeding a second threshold, the second RS for sending the second preamble.

31. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

determine a difference between a first frequency associated with the first RS and a second frequency associated with the second RS; and

select, based on the difference exceeding a second threshold, the second RS for sending the second preamble.

32. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to monitor the downlink control channel for DCI based on sending the first preamble, and

wherein the second measurement is determined before monitoring the downlink control channel for DCI.

33. 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:

determine a beam failure of a cell;

determine, for beam failure recovery, a first measurement of a first reference signal (RS) associated with a first candidate beam of the cell and a second measurement of a second RS associated with a second candidate beam of the cell;

based on the beam failure, send a first preamble corresponding to the first RS;

monitor, via the first candidate beam, a downlink control channel for downlink control information (DCI); and

based on unsuccessful reception of the DCI and based on the second measurement being greater than a threshold, send a second preamble corresponding to the second RS.

34. The wireless device of claim 33 , wherein the instructions, when executed by the one or more processors, cause the wireless device to determine the unsuccessful reception of the DCI after determining the first measurement and the second measurement.

35. The wireless device of claim 33 , wherein the instructions, when executed by the one or more processors, cause the wireless device to send the first preamble further based on at least one of:

the first measurement being greater than the second measurement;

a random selection associated with measurements, of a plurality of reference signals, being greater than the threshold; or

the first measurement being greater than the threshold.

36. The wireless device of claim 33 , wherein the instructions, when executed by the one or more processors, cause the wireless device to determine the first measurement and the second measurement after determining the beam failure.

37. The wireless device of claim 33 , wherein the DCI is associated with the first preamble.

38. The wireless device of claim 33 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

select, based on the first measurement and the second measurement, the first candidate beam; and

determine, based on selecting the first candidate beam, to send the first preamble.

39. The wireless device of claim 33 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

select, based on the unsuccessful reception of the DCI, the second candidate beam; and

determine, based on selecting the second candidate beam, to send the second preamble.

40. The wireless device of claim 33 , wherein the instructions, when executed by the one or more processors, cause the wireless device to select, based on the first measurement being greater than the second measurement, the first RS for sending the first preamble.

41. The wireless device of claim 33 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

determine a difference between a first transmission time interval (TTI) associated with the first RS and a second TTI associated with the second RS; and

select, based on the difference exceeding a second threshold, the second RS for sending the second preamble.

42. The wireless device of claim 33 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:

determine a difference between a first frequency associated with the first RS and a second frequency associated with the second RS; and

select, based on the difference exceeding a second threshold, the second RS for sending the second preamble.