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