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