16.18.8 BRID and DAA Support via A2X Communication

The Aerial UE supports A2X communication, as defined in 3.2. BRID relies on broadcasting while DAA can be provided either via unicast or broadcast transmissions in NR sidelink. BRID and DAA message transmission is supported in both in-coverage and out-of-coverage scenarios and relies on UE autonomous resource selection for NR sidelink communication.

BRID and DAA follow the QoS framework defined for NR sidelink and dedicated A2X PQI values are specified in table 6.2.4.1-1 of TS 23.256 [60]. The NG-RAN can configure separate SL Tx resource pool(s) for BRID and/or DAA. The procedure for SL Tx pool selection for A2X is described in TS 38.321 [6], clause 5.22.