The non-access stratum(NAS) includes the protocols outside the access stratum,i.e. the protocols not related to the transport of user data or network signaling. They concern all data and signaling messages exchanged between the UE and the CN independently on the radio access technology implemented within the UMTS network. The UTRAN does not analyze these NAS messages and just plays the role of a relaying function. The user plane in NAS comprises basically user application protocols generating data streams to be transported by AS, that may or not adhere to GSM/UMTS standards. On the other hand, the NAS control plane encompasses all the protocols associated to Connection Management(CM) and Mobility Management (MM) functions for circuit-switched services, and Session Management(SM) and GPRS Mobility Management(GMM) functions for packet-switched services.
The NAS is a function layer running between the User Equipment(UE) and the Core Network(CN). The layer support traffic and signalling messages between CN and UE.
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| NAS (non-access stratum) |
The NAS is a function layer running between the User Equipment(UE) and the Core Network(CN). The layer support traffic and signalling messages between CN and UE.
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