Interruption phases are inserted in {HEAD ~ a UMTS transmission} in order to monitor {TAIL ~ GSM base stations} 
Interruption phases are inserted in { HEAD ~ a UMTS transmission } in order to monitor { TAIL ~ GSM base stations }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL