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