What is the operation of band pass in mobile phone nas signaling?

Good answer (adoption time: 2011-04-0721:14) UU interface protocol is divided into access layer and non-access layer, in which the access layer includes physical layer (L 1), data link layer (L2) and network layer. The non-access layer includes mobile management layer and connection management layer. ，y 4 b 2j 7 o & amp； After r UE establishes RRC connection with UTRAN, UE establishes signaling connection with CN through RNC, which is called NAS message, such as authentication and service request.