The UE transmits one combined message of an AS control message and a NAS control message including information indicating transmission of an SIP message, thereby having an effect on {HEAD ~ an upper node} to reduce {TAIL ~ a delay} due to message processing 
to reduce
The UE transmits one combined message of an AS control message and a NAS control message including information indicating transmission of an SIP message , thereby having an effect on { HEAD ~ an upper node } to reduce { TAIL ~ a delay } due to message processing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH