System and method for beam training with relay links

1. A method of wireless communication by a control node, the method comprising:

determining a first set of measurements associated with at least one set of beam pairs to provide first control information in a bandwidth part (BWP) to a relay device and to communicate at least one of data or second control information for at least one second wireless device to be relayed by the relay device over a wider frequency bandwidth than the BWP, wherein the at least one set of beam pairs includes at least a first transmit beam and a first receive beam to facilitate communication via at least one of a wireless backhaul link between a first wireless device and the relay device, a first relay access link portion between the first wireless device and the relay device, or a second relay access link portion between the relay device and the at least one second wireless device;

configuring at least one subset of beam pairs of the at least one set of beam pairs based on the first set of measurements, measured in part by the control node, associated with the at least one set of beam pairs; and

transmitting information indicating the at least one subset of beam pairs to the relay device.

2. The method of claim 1 , wherein the first wireless device comprises the control node, the method further comprising:

communicating, with the relay device, the first control information for the relay device and the at least one of the data or the second control information for the at least one second wireless device to be relayed by the relay device.

3. The method of claim 2 , wherein determining the first set of measurements includes determining each measurement associated with a respective bandwidth part of a set of bandwidth parts available for the first control information in an available system bandwidth that corresponds to the wider frequency bandwidth for the at least one of the data or the second control information,

wherein each bandwidth part of the set of bandwidth parts is associated with the first control information for the relay device at a corresponding interval of a set of intervals.

4. The method of claim 3 , further comprising:

configuring the set of bandwidth parts for the first control information,

wherein each bandwidth part of the set of bandwidth parts is active for the first control information at respective intervals of the set of intervals.

5. The method of claim 3 , wherein determining the first set of measurements associated with the at least one set of beam pairs comprises one of:

receiving the first set of measurements from the relay device based on a first set of reference signals transmitted to the relay device, or

measuring each measurement of the first set of measurements based on a second set of reference signals received from the relay device.

6. The method of claim 3 , wherein configuring the at least one subset of beam pairs based on the first set of measurements comprises:

configuring a first subset of the at least one set of beam pairs for the wireless backhaul link based on the first set of measurements,

wherein each beam pair of the first subset of the at least one set of beam pairs is associated with respective bandwidth parts of the set of bandwidth parts at the corresponding interval of the set of intervals.

7. The method of claim 6 , further comprising:

configuring a second subset of beam pairs of the at least one set of beam pairs for the first relay access link portion based on the first set of measurements,

wherein each beam pair of the second subset of beam pairs is associated with at least one of the data or the second control information carried on a wideband of the available system bandwidth excluding the respective bandwidth part of the set of bandwidth parts at the corresponding interval of the set of intervals.

8. The method of claim 2 , wherein determining the first set of measurements associated with the at least one set of beam pairs comprises one of:

receiving the first set of measurements from the at least one second wireless device based on a first set of reference signals relayed to the at least one second wireless device by the relay device, or

measuring each measurement of the first set of measurements based on a second set of reference signals relayed from the at least one second wireless device by the relay device.

9. The method of claim 8 , wherein configuring the at least one subset of beam pairs based on the first set of measurements comprises at least one of:

configuring a first beam pair of the at least one subset of beam pairs for the wireless backhaul link between the first wireless device and the relay device,

configuring a second beam pair of the at least one subset of beam pairs for the first relay access link portion between the first wireless device and the relay device, or

configuring a third beam pair of the at least one subset of beam pairs for the second relay access link portion between the relay device and the at least one second wireless device.

10. An apparatus for wireless communication at a control node, comprising:

a memory; and

at least one processor coupled to the memory and configured to:

determine a first set of measurements associated with at least one set of beam pairs to provide first control information in a bandwidth part (BWP) to a relay device and to communicate at least one of data or second control information for at least one second wireless device to be relayed by the relay device over a wider frequency bandwidth than the BWP, wherein the at least one set of beam pairs includes at least a first transmit beam and a first receive beam to facilitate communication via at least one of a wireless backhaul link between a first wireless device and the relay device, a first relay access link portion between the first wireless device and the relay device, or a second relay access link portion between the relay device and the least one second wireless device;

configure at least one subset of beam pairs of the at least one set of beam pairs based on the first set of measurements, measured in part by the control node, associated with the at least one set of beam pairs; and

transmit information indicating the at least one subset of beam pairs to the relay device.

11. The apparatus of claim 10 , wherein the first wireless device comprises the control node, and the at least one processor is further configured to:

communicate, with the relay device, the first control information for the relay device and the at least one of the data or the second control information for the at least one second wireless device to be relayed by the relay device.

12. The apparatus of claim 11 , wherein to determine the first set of measurements includes a determination that each measurement associated with a respective bandwidth part of a set of bandwidth parts available for the first control information in an available system bandwidth that corresponds to the wider frequency bandwidth for the at least one of the data or the second control information,

wherein each bandwidth part of the set of bandwidth parts is associated with the first control information for the relay device at a corresponding interval of a set of intervals.

13. The apparatus of claim 12 , wherein the at least one processor is further configured to:

configure the set of bandwidth parts for the first control information,

wherein each bandwidth part of the set of bandwidth parts is active for the first control information at respective intervals of the set of intervals.

14. The apparatus of claim 12 , wherein to determine the first set of measurements associated with the at least one set of beam pairs, the at least one processor is configured to one of:

receive the first set of measurements from the relay device based on a first set of reference signals transmitted to the relay device, or

measure each measurement of the first set of measurements based on a second set of reference signals received from the relay device.

15. The apparatus of claim 12 , wherein to configure the at least one subset of beam pairs based on the first set of measurements, the at least one processor is configured to:

configure a first subset of the at least one set of beam pairs for the wireless backhaul link based on the first set of measurements,

wherein each beam pair of the first subset of the at least one set of beam pairs is associated with respective bandwidth parts of the set of bandwidth parts at the corresponding interval of the set of intervals.

16. The apparatus of claim 15 , wherein the at least one processor is further configured to:

configure a second subset of beam pairs of the at least one set of beam pairs for the first relay access link portion based on the first set of measurements,

wherein each beam pair of the second subset of beam pairs is associated with at least one of the data or the second control information carried on a wideband of the available system bandwidth excluding the respective bandwidth part of the set of bandwidth parts at the corresponding interval of the set of intervals.

17. The apparatus of claim 11 , wherein to determine the first set of measurements associated with the at least one set of beam pairs, the at least one processor is configured to one of:

receive the first set of measurements from the at least one second wireless device based on a first set of reference signals relayed to the at least one second wireless device by the relay device, or

measure each measurement of the first set of measurements based on a second set of reference signals relayed from the at least one second wireless device by the relay device.

18. The apparatus of claim 17 , wherein to configure the at least one subset of beam pairs based on the first set of measurements, the at least one processor is configured to at least one of:

configure a first beam pair of the at least one subset of beam pairs for the wireless backhaul link between the first wireless device and the relay device,

configure a second beam pair of the at least one subset of beam pairs for the first relay access link portion between the first wireless device and the relay device, or

configure a third beam pair of the at least one subset of beam pairs for the second relay access link portion between the relay device and the at least one second wireless device.

19. A method of wireless communication by a relay device, the method comprising:

receiving, from a first wireless device, information indicating a subset of beam pairs of a set of beam pairs based on a first set of measurements, measured in part by the first wireless device, associated with the set of beam pairs that provides first control information in a bandwidth part (BWP) and communicates at least one of data or second control information for at least one second wireless device to be relayed by the relay device over a wider frequency bandwidth than the BWP, wherein the subset of beam pairs includes at least a first transmit beam and a first receive beam to facilitate communication via at least one of a wireless backhaul link between the first wireless device and the relay device, a first relay access link portion between the first wireless device and the relay device, or a second relay access link portion between the relay device and the at least one second wireless device;

receiving the first control information on the wireless backhaul link from the first wireless device; and

relaying the at least one of the data or the second control information between the first wireless device on the first relay access link portion and the at least one second wireless device on the second relay access link portion,

wherein at least one of receiving the first control information or relaying at least one of the data or the second control information is based on the subset of beam pairs.

20. The method of claim 19 , wherein the first set of measurements includes a determination that each measurement is associated with a respective bandwidth part of a set of bandwidth parts available for the first control information in an available system bandwidth that corresponds to the wider frequency bandwidth for the at least one of the data or the second control information,

wherein each bandwidth part of the set of bandwidth parts is associated with the first control information on the wireless backhaul link at a corresponding interval of a set of intervals.

21. The method of claim 20 , further comprising:

receiving, from the first wireless device, second information indicating the set of bandwidth parts for the first control information,

wherein each bandwidth part of the set of bandwidth parts is active for the first control information at respective intervals of the set of intervals.

22. The method of claim 20 , further comprising:

transmitting a set of reference signals to the first wireless device to facilitate measurement of each measurement of the first set of measurements by the first wireless device.

23. The method of claim 20 , further comprising:

receiving a set of reference signals from the first wireless device;

measuring each measurement of the first set of measurements based on the set of reference signals; and

transmitting the first set of measurements to the first wireless device.

24. The method of claim 20 , wherein the information indicating the subset of beam pairs comprises a first subset of beam pairs for the wireless backhaul link,

wherein each beam pair of the first subset of beam pairs is associated with respective bandwidth parts of the set of bandwidth parts at the corresponding interval of the set of intervals.

25. The method of claim 24 , wherein the information indicating the subset of beam pairs comprises a second subset of beam pairs for the first relay access link portion,

wherein each beam pair of the second subset of beam pairs is associated with at least one of the data or the second control information carried on a wideband of the available system bandwidth excluding the respective bandwidth part of the set of bandwidth parts at the corresponding interval of the set of intervals.

26. The method of claim 19 , further comprising:

relaying a set of reference signals between the first wireless device and the at least one second wireless device, and

wherein the first set of measurements is based on the set of reference signals,

wherein the subset of beam pairs comprises a first beam pair associated with the first relay access link portion and a second beam pair associated with the second relay access link portion.

27. The method of claim 19 , wherein the first set of measurements is based on a set of reference signals received from the first wireless device, and wherein the subset of beam pairs comprises a first beam pair associated with downlink communication on the wireless backhaul link.

28. The method of claim 19 , wherein the first set of measurements is based on a set of reference signals transmitted to the first wireless device, and wherein the subset of beam pairs comprises a first beam pair associated with uplink communication on the wireless backhaul link.

29. An apparatus for wireless communication at a relay device, comprising:

a memory; and

at least one processor coupled to the memory and configured to:

receive, from a first wireless device, information indicating a subset of beam pairs of a set of beam pairs based on a first set of measurements, measured in part by the first wireless device, associated with the set of beam pairs that provides first control information in a bandwidth part (BWP) and communicates at least one of data or second control information for at least one second wireless device to be relayed by the relay device over a wider frequency bandwidth than the BWP, wherein the subset of beam pairs includes at least a first transmit beam and a first receive beam to facilitate communication via at least one of a wireless backhaul link between the first wireless device and the relay device, a first relay access link portion between the first wireless device and the relay device, or a second relay access link portion between the relay device and the at least one second wireless device;

receive the first control information on the wireless backhaul link from the first wireless device; and

relay the at least one of the data or the second control information between the first wireless device on the first relay access link portion and the at least one second wireless device on the second relay access link portion,

wherein at least one of receiving the first control information or relaying at least one of the data or the second control information is based on the subset of beam pairs.

30. The apparatus of claim 29 , wherein the first set of measurements includes a determination that each measurement is associated with a respective bandwidth part of a set of bandwidth parts available for the first control information in an available system bandwidth that corresponds to the wider frequency bandwidth for the at least one of the data or the second control information,

wherein each bandwidth part of the set of bandwidth parts is associated with the first control information on the wireless backhaul link at a corresponding interval of a set of intervals.