SCell beam failure recovery

1. A method of a user equipment (“UE”) comprising:

receiving a scheduling request (“SR”) configuration comprising a set of Physical Uplink Control Channel (“PUCCH”) resources, wherein the SR configuration corresponds to one or more logical channels;

detecting that a beam failure recovery procedure has been triggered for a secondary cell (“SCell”);

triggering an SR for a SCell beam failure recovery in response to unavailable Uplink Shared Channel (“UL-SCH”) resources for a new transmission of a beam failure recovery Medium Access Control (“MAC”) control element (“MAC-CE”); and

transmitting the SR on a PUCCH resource of the SR configuration in response to triggering the SR for the SCell beam failure recovery.

2. The method of claim 1 , further comprising:

receiving an indication indicating a mapping of the SCell beam failure recovery to the SR configuration.

3. The method of claim 1 , further comprising:

determining an uplink (“UL”) resource for the beam failure recovery MAC-CE in response to the transmitted SR, wherein the UL resource is associated with a Hybrid Automatic Repeat Request (“HARQ”) process; and

transmitting the beam failure recovery MAC-CE on the UL resource.

4. The method of claim 3 , further comprising:

receiving an UL grant for a HARQ transmission associated with the HARQ process and the beam failure recovery MAC-CE; and

determining that the beam failure recovery procedure is successfully completed based at least in part on the UL grant.

5. The method of claim 4 , wherein receiving the UL grant comprises receiving a downlink control information (“DCI”) addressed to a cell-specific radio network temporary identifier (“C-RNTI”) of the UE, and wherein the UL grant comprises a new data indicator (“NDI”) that is toggled as compared to a reference NDI for the HARQ process.

6. The method of claim 1 , wherein receiving the SR configuration comprises receiving a beam failure recovery SR configuration including a PUCCH resource for a SCell beam failure recovery request (“BFRQ”) and one or more parameters associated with a SCell beam failure recovery SR procedure.

7. The method of claim 6 , wherein the beam failure recovery SR configuration is for a primary cell or a primary secondary cell.

8. The method of claim 6 , wherein the beam failure recovery SR configuration is configured on a respective SCell different that the SCell associated with the beam failure recovery procedure.

9. The method of claim 1 , wherein transmitting the SR on the PUCCH resource of the SR configuration comprises transmitting a beam failure recovery SR using one or more valid SR PUCCH resources configured for the UE.

10. The method of claim 1 , further comprising:

ignoring one or more uplink (“UL”) grants allocating one or more resources associated with the SCell until a successful completion of the beam failure recovery procedure.

11. The method of claim 1 , further comprising:

transmitting the beam failure recovery MAC-CE according to an uplink grant in response to one or more unavailable UL-SCH resources available for the new transmission of the beam failure recovery MAC-CE.

12. The method of claim 1 , further comprising:

refraining from transmitting the beam failure recovery MAC-CE on a semi-persistently scheduled uplink (“UL”) resource.

13. The method of claim 1 , further comprising:

retriggering the SR for the SCell beam failure recovery based on the beam failure recovery procedure being unsuccessful and an expiration of a timer.

14. The method of claim 1 , wherein transmitting the SR on the PUCCH resource of the SR configuration comprises:

transmitting a beam failure recovery SR using the SR configuration or one or more PUCCH resources of a Special Cell (“SpCell”) based on SR resources being configured on the SpCell, the SpCell comprising a primary cell or a primary secondary cell; and

performing a random access (“RACH”) procedure on the SpCell based on the SR resources not being configured on the SpCell.

15. A user equipment (“UE”) for wireless communication, comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the UE to:

receive a scheduling request (“SR”) configuration comprising a set of Physical Uplink Control Channel (“PUCCH”) resources, wherein the SR configuration corresponds to one or more logical channels;

detect that beam failure procedure has been triggered for a secondary cell (“SCell”);

trigger an SR for a SCell beam failure recovery in response to unavailable Uplink Shared Channel (“UL-SCH”) resources available for a new transmission for the transmission of a beam failure recovery Medium Access Control (“MAC”) control element (“MAC-CE”); and

transmit the SR on a PUCCH resource of the SR configuration in response to triggering the SR for the SCell beam failure recovery.

16. The UE of claim 15 , wherein the at least one processor is configured to cause the UE to receive an indication indicating a mapping of the SCell beam failure recovery to the SR configuration.

17. The UE of claim 15 , wherein the at least one processor is configured to cause the UE to:

determine that an uplink (“UL”) resource for the beam failure recovery MAC-CE in response to the transmitted SR, wherein the UL resource is associated with a Hybrid Automatic Repeat Request (“HARQ”) process; and

transmit the beam failure recovery MAC-CE on the UL resource.

18. The UE of claim 17 , wherein the at least one processor is configured to cause the UE to:

receives an UL grant for a HARQ transmission associated with the HARQ process and the beam failure recovery MAC-CE; and

determines that the beam failure recovery procedure is successfully completed based at least in part on the UL grant.

19. The UE of claim 18 , wherein to receive the UL grant, the at least one processor is configured to cause the UE to receive a downlink control information (“DCI”) addressed to a cell-specific radio network temporary identifier (“C-RNTI”) of the UE, and wherein the UL grant comprises a new data indicator (“NDI”) that is toggled as compared to a reference NDI for the HARQ process.

20. The UE of claim 15 , wherein, to receive the SR configuration, the at least one processor is configured to cause the UE to receive a beam failure recovery SR configuration including a PUCCH resource for a SCell beam failure recovery request (“BFRQ”) and one or more parameters associated with a SCell beam failure recovery SR procedure.