Section: 16.18.8 BRID and DAA Support via A2X Communication
Content: The Aerial UE supports A2X communication which is broadcasting of BRID and DAA messages using NR sidelink. DAA can also be provided via unicast transmissions in NR sidelink. BRID and DAA message transmission is supported in both in-coverage and out-of-coverage scenarios and relies only 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 stored in table 6.2.4.1-1 of TS 23.256[ Support of Uncrewed Aerial Systems (UAS) connectivity, identification and tracking; Stage 2 ]  [60]. The NG-RAN can configure a separate SL Tx resource pool for BRID and DAA. The SL Tx pool selection for A2X is described in TS 38.321[ NR; Medium Access Control (MAC) protocol specification ]  [6], clause 5.22.