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 an upper node to reduce {HEAD ~ a delay} due to {TAIL ~ message processing} 
due to
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 an upper node to reduce { HEAD ~ a delay } due to { TAIL ~ message processing }
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