In {TAIL ~ a communication system} between mobile communication devices and an immobile communication device, {HEAD ~ a mobile device} receives a FCMC signal from the immobile device upon entering a communication service area of the immobile device 
In
In { TAIL ~ a communication system } between mobile communication devices and an immobile communication device , { HEAD ~ a mobile device } receives a FCMC signal from the immobile device upon entering a communication service area of the immobile device
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH