{HEAD ~ The radio communication unit} transmits a request regarding availability of {TAIL ~ one or more specific radio communication services} 
{ HEAD ~ The radio communication unit } transmits a request regarding availability of { TAIL ~ one or more specific radio communication services }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL