{HEAD ~ The mobile device} 1 receives {TAIL ~ a message data channel signal} from the immobile device 2 at step 710, and checks at step 720 whether it is a release command 
receives
{ HEAD ~ The mobile device } 1 receives { TAIL ~ a message data channel signal } from the immobile device 2 at step 710 , and checks at step 720 whether it is a release command
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH