Resource management for beam failure recovery procedures
Wireless communications are described. A wireless device and/or a base station may provide improved resource management. A base station may configure and/or transmit a beam failure recovery medium access control control element (BFR MAC CE) to a wireless device to configure particular cells to use particular assigned candidate beams from a pool of shared candidate beams during beam failure recovery operations. The BFR MAC CE may provide orthogonality in beams that may be designated for use by active cells out of a shared pool of beams that may not be orthogonal across all potentially available cells.
1. A method comprising:
receiving, by a wireless device, one or more configuration parameters that indicate a plurality of beam failure recovery request (BFRQ) resources for one or more secondary cells;
receiving a medium access control (MAC) control element (CE) comprising:
a first field indicating a cell of the one or more secondary cells; and
a second field indicating at least one BFRQ resource, of the plurality of BFRQ resources, for the indicated cell of the one or more secondary cells;
determining to perform a random access procedure for a beam failure recovery of the indicated cell;
determining, based on the at least one BFRQ resource and for the random access procedure, at least one preamble and at least one random access channel resource; and
transmitting, via the at least one random access channel resource the at least one preamble.
2. The method of claim 1 , wherein the MAC CE further comprises a third field indicating a downlink bandwidth part (BWP) of the indicated cell, and wherein the random access procedure for the beam failure recovery of the indicated cell is for the downlink BWP of the indicated cell.
3. The method of claim 1 , wherein:
the plurality of BFRQ resources comprises a first quantity of BFRQ resources;
the at least one BFRQ resource is among a second quantity of orthogonal BFRQ resources that are each indicated by a different value of the second field; and
the second quantity is less than the first quantity.
4. The method of claim 1 , further comprising determining, based on the MAC CE, to perform at least one of:
activating a first BFRQ resource of the at least one BFRQ resource; or
deactivating the first BFRQ resource.
5. The method of claim 1 , further comprising:
based on detecting a beam failure before receiving a second MAC CE, refraining from performing a second random access procedure for a second beam failure recovery of the indicated cell of the one or more secondary cells.
6. The method of claim 1 , wherein the at least one BFRQ resource is associated with a first reference signal of one or more reference signals for a candidate beam selection, and wherein the determining the at least one random access channel resource is further based on the first reference signal.
7. The method of claim 1 , wherein the second field indicating the at least one BFRQ resource of the plurality of BFRQ resources further indicates a preamble index associated with the at least one BFRQ resource, and wherein the determining the at least one preamble is further based on the preamble index.
8. A method comprising:
receiving, by a wireless device, one or more configuration parameters for one or more secondary cells, wherein the one or more configuration parameters indicate a plurality of beam failure recovery request (BFRQ) resources;
receiving a medium access control (MAC) control element (CE) comprising:
one or more first fields indicating a cell of the one or more secondary cells;
one or more second fields indicating at least one BFRQ resource of the plurality of BFRQ resources; and
one or more third fields indicating a downlink bandwidth part (BWP) of the cell;
determining to perform a random access procedure for a beam failure recovery of the downlink BWP of the cell;
determining, based on the one or more first fields and the one or more second fields, at least one preamble; and
transmitting, via an uplink BWP associated with the downlink BWP of the cell, the at least one preamble.
9. The method of claim 8 , wherein:
the plurality of BFRQ resources comprises a first quantity of BFRQ resources;
the at least one BFRQ resource is among a second quantity of orthogonal BFRQ resources that are each indicated by a different value of the one or more second fields; and
the second quantity is less than the first quantity.
10. The method of claim 8 , further comprising determining, based on the MAC CE, to perform at least one of:
activating a first BFRQ resource of the at least one BFRQ resource; or
deactivating the first BFRQ resource.
11. The method of claim 8 , further comprising:
based on detecting a beam failure before receiving a second MAC CE, refraining from performing a second random access procedure for a second beam failure recovery of the cell.
12. The method of claim 8 , wherein the at least one BFRQ resource is associated with a first reference signal of one or more reference signals for a candidate beam selection, and wherein the method further comprises determining, based on the first reference signal, at least one random access channel resource of the uplink BWP.
13. The method of claim 8 , wherein the one or more second fields indicating the at least one BFRQ resource of the plurality of BFRQ resources further a preamble index associated with the at least one BFRQ resource, and wherein the determining the at least one preamble is further based on the preamble index.
14. The method of claim 8 , further comprising determining, based on the at least one BFRQ resource, at least one random access channel resource of the uplink BWP for the transmitting the at least one preamble.
15. A method comprising:
receiving, by a wireless device, one or more configuration parameters indicating a plurality of beam failure recovery request (BFRQ) resources for one or more secondary cells;
receiving a medium access control (MAC) control element (CE) indicating at least one BFRQ resource, of the plurality of BFRQ resources, and indicating a cell of the one or more secondary cells;
determining to perform a random access procedure for a beam failure recovery of the indicated cell of the one or more secondary cells;
determining, based on the at least one BFRQ resource, at least one preamble; and
transmitting, via at least one random access channel resource of the at least one BFRQ resource, the at least one preamble.
16. The method of claim 15 , wherein:
the plurality of BFRQ resources comprises a first quantity of BFRQ resources;
the at least one BFRQ resource is among a second quantity of orthogonal BFRQ resources that are each indicated by a different value of a field in the MAC CE; and
the second quantity is less than the first quantity.
17. The method of claim 15 , further comprising determining, based on the MAC CE, to perform at least one of:
activating a first BFRQ resource of the at least one BFRQ resource; or
deactivating the first BFRQ resource.
18. The method of claim 15 , further comprising:
based on detecting a beam failure before receiving a second MAC CE, refraining from performing a second random access procedure for a second beam failure recovery of the indicated cell.
19. The method of claim 15 , wherein the at least one BFRQ resource is associated with a first reference signal of one or more reference signals for a candidate beam selection, and wherein the method further comprises determining, based on the first reference signal, the at least one random access channel resource.
20. The method of claim 15 , wherein the MAC CE further indicates a preamble index associated with the at least one BFRQ resource, and wherein the determining the at least one preamble is further based on the preamble index.