Beam recovery frame structure and recovery request for communication systems

1. An apparatus for a base station, comprising baseband circuitry having: a radio frequency (RF) interface; and

one or more processors configured to:

determine a beam recovery frame structure that includes one or more recovery channels associated with a configured PUCCH resource, wherein the beam recovery frame structure is based at least partially on beam correspondence capabilities;

receive a beam recovery signal corresponding to the beam recovery frame structure; and

select a scaling factor K between a subcarrier spacing of a recovery channel of the one or more recovery channels and the beam recovery signal.

2. The apparatus of claim 1 , wherein the beam correspondence capabilities include that beam correspondence is supported by one or more of the base station or a user equipment (UE) device.

3. The apparatus of claim 1 , wherein the determined beam recovery frame structure includes a plurality of repetitions of a recovery channel, where each repetition includes a cyclic prefix (CP) as a time boundary.

4. The apparatus of claim 1 , wherein the determined beam recovery frame structure includes a plurality of repetitions of a recovery channel, where each repetition omits a time boundary.

5. The apparatus of claim 1 , wherein the one or more recovery channels include one or more of a physical random access channel (PRACH) and a physical uplink control channel (PUCCH).

6. The apparatus of claim 1 , wherein the determined beam recovery frame structure aligns repetitions of the one or more recovery channels by time.

7. The apparatus of claim 1 , wherein the scaling factor K is provided by higher layer signaling or downlink control information (DCI).

8. The apparatus of claim 1 , wherein the one or more processors are further configured to determine a frame structure for a first recovery channel independent of a frame structure for a second recovery channel and wherein the first recovery channel is not aligned with the second recovery channel.

9. The apparatus of claim 1 , wherein the one or more processors are configured to initiate beam recovery on a quality of at least one maintained beam or a subset of maintained beams falling below a threshold.

10. The apparatus of claim 1 , wherein the one or more processors are configured to perform beam sweeping using one or more beam recovery signals from a received recovery frame via the RF interface, where the received recovery frame is in accordance with the determined beam recovery frame structure.

11. The apparatus of claim 1 , further configured to provide the determined beam recovery frame structure to the RF interface before receiving the beam recovery signal.

12. The apparatus of claim 1 , wherein the one or more recovery channels are selected based on one or more recovery factors including a user equipment (UE) antenna structure of a UE device.

13. An apparatus for a user equipment (UE) device, comprising baseband circuitry having:

a radio frequency (RF) interface configured to receive a beam recovery frame structure that includes one or more recovery channels associated with a PUCCH resource; and

one or more processors configured to:

generate one or more beam recovery signals based on the beam recovery frame structure; and

transmit the one or more beam recovery signals wherein a scaling factor K is selected between a subcarrier spacing of the one or more recovery channels and the transmitted one or more beam recovery signals.

14. The apparatus of claim 13 , wherein the one or more processors are further configured to determine the beam recovery frame structure.

15. The apparatus of claim 13 , further configured to generate a recovery frame having a first recovery channel and a second recovery channel that is different from the first recovery channel using the beam recovery frame structure wherein the first recovery channel is a physical uplink control channel (PUCCH) and the second recovery channel is a physical random access channel (PRACH).

16. The apparatus of claim 13 , further configured to generate a recovery frame having a first recovery channel and a second recovery channel that is different from the first recovery channel using the beam recovery frame structure wherein the one or more processors are further configured to select the first recovery channel and the second recovery channel based on recovery channel factors including beam correspondence capabilities, directionality of the UE device, and recovery signal type.

17. The apparatus of claim 16 , wherein the recovery signal type is a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS).

18. The apparatus of claim 13 , wherein the one or more processors are further configured to select one or more recovery channels based on beam correspondence capabilities and to generate a beam recovery request using the selected one or more recovery channels.

19. A non-transitory computer-readable media having instructions that, when executed, cause a base station to:

determine a beam recovery frame structure that includes a recovery channel associated with a configured PUCCH resource;

receive one or more beam recovery signals associated with the recovery channel; and

select a scaling factor K between a subcarrier spacing of the recovery channel and a beam recovery signal of the one or more beam recovery signals.

20. The non-transitory computer-readable media of claim 19 , wherein the recovery channel is selected based on recovery channel factors that include beam correspondence capabilities.

21. The non-transitory computer-readable media of claim 19 , wherein the instructions, when executed, further cause the base station to maintain a plurality of beams for a user equipment (UE) device and to initiate beam recovery on a beam quality for a beam of the plurality of beams being below a threshold.