Frequency range 2 (FR2) non-standalone sidelink discovery

A method for wireless communications at a first user equipment (UE), comprising:

• providing an indication of sequences associated with a first frequency range to a second UE, said sequences being used for beam training;
• selecting, from a first set of sequences, at least one of the sequences to indicate a capability, wherein the first set of sequences indicate the first UE is capable of operating over the first frequency range and not capable of operating over a second frequency range;
• and
• indicating, via the at least one of the sequences and to the second UE, the capability, wherein indicating the capability includes using the at least one of the sequences as a signature to indicate the capability.

A method for wireless communications by a receiver user equipment (UE), comprising:

• receiving one or more transmissions from a transmitter UE via a first frequency range;
• detecting, based on the one or more transmissions, a beam training sequence indicating a communication capability associated with a second frequency range outside of the first frequency range, wherein the beam training sequence is used as a signature to indicate the communication capability;
• and
• performing one or more actions via the second frequency range, wherein the one or more actions comprise transmitting a discovery message via the second frequency range in response to the detection.

A user equipment (UE), comprising:

• a transceiver;
• memory comprising executable instructions;
• and
• one or more processors, individually or in any combination, configured to execute the executable instructions and cause the UE to:
• transmit, via the transceiver, via at least a first frequency range, and to one or more unspecified UEs, a discovery message to enable wireless communications via a second frequency range different from the first frequency range, wherein the discovery message comprises:
• an indication of a random access channel (RACH) sequence to be used for beam training via the second frequency range, and
• an indication that requests a notification about at least one of beam training sequences or one or more beam training occasions;
• and
• receive, via the first frequency range, via the transceiver, and from the one or more unspecified UEs, a transmission, the transmission including a response that indicates the at least one of the beam training sequences or the one or more beam training occasions.