The V2X architecture is described in
TS 23.287 which describes V2X communication over both the Uu reference point supported by E-UTRA connected to 5GC and/or NR connected to 5GC and PC5 reference point supported by E-UTRA and/or NR. The NR based PC5 reference point supports unicast, groupcast and broadcast modes (see
TS 23.287).
The security for PC5 reference point supported by E-UTRA is given in
TS 33.185. The security for the other cases is given in the present document.