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