System and method for beam training with relay links

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.

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.

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.