The method 3, wherein the step of transmitting is performed when information regarding {HEAD ~ availability} of {TAIL ~ the specific radio communication service} is not currently retained by the radio communication unit 
of
The method 3 , wherein the step of transmitting is performed when information regarding { HEAD ~ availability } of { TAIL ~ the specific radio communication service } is not currently retained by the radio communication unit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH