Non-access stratum is a functional layer in the UMTS wireless telecom protocol stack

Protocol stack

The protocol stack is an implementation of a computer networking protocol suite. The terms are often used interchangeably. Strictly speaking, the suite is the definition of the protocols, and the stack is the software implementation of them....

 between a core network

Core network

A core network, or network core, is the central part of a telecommunication network that provides various services to customers who are connected by the access network. One of the main functions is to route telephone calls across the PSTN....

 and user equipment.
The layer supports signalling and traffic between those two elements.

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| HTTP  | | Application

Application layer

The Internet protocol suite and the Open Systems Interconnection model of computer networking each specify a group of protocols and methods identified by the name application layer....

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| TCP

Transmission Control Protocol

The Transmission Control Protocol is one of the core protocols of the Internet Protocol Suite. TCP is one of the two original components of the suite, complementing the Internet Protocol , and therefore the entire suite is commonly referred to as TCP/IP...

  | | Transport

Transport layer

In computer networking, the transport layer or layer 4 provides end-to-end communication services for applications within a layered architecture of network components and protocols...

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| IP

Internet Protocol

The Internet Protocol is the principal communications protocol used for relaying datagrams across an internetwork using the Internet Protocol Suite...

  | | Internet

Internet layer

The internet layer or IP layer is a group of internetworking methods in the Internet protocol suite, commonly also called TCP/IP, which is the foundation of the Internet...

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| NAS | | Network

Network layer

The network layer is layer 3 of the seven-layer OSI model of computer networking.The network layer is responsible for packet forwarding including routing through intermediate routers, whereas the data link layer is responsible for media access control, flow control and error checking.The network...

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| AS

Access Stratum

The access stratum is a functional layer in the UMTS wireless telecom protocol stack between radio network and user equipment.The radio network is also called access network. +- - - - - -+ +- - - - - - -+ | HTTP | | Application |...

  | | Link

Link Layer

In computer networking, the link layer is the lowest layer in the Internet Protocol Suite , the networking architecture of the Internet . It is the group of methods or protocols that only operate on a host's link...

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| Channels

Channel access method

In telecommunications and computer networks, a channel access method or multiple access method allows several terminals connected to the same multi-point transmission medium to transmit over it and to share its capacity...

  | | Physical

Physical layer

The physical layer or layer 1 is the first and lowest layer in the seven-layer OSI model of computer networking. The implementation of this layer is often termed PHY....

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Functionality

The following functions exist in the non-access stratum:

• Mobility management
  Mobility management
  Mobility management is one of the major functions of a GSM ora UMTS network that allows mobile phones to work. The aim of mobility management is to track where the subscribers are, allowing calls, SMS and other mobile phone services to be delivered to them....
  
  
• Call control
  Call control
  In telephony, call control refers to the software within a telephone switch that supplies its central function. Call control decodes addressing information and routes telephone calls from one end point to another. It also creates the features that can be used to adapt standard switch operation to...
  
  
• Session management
  Session management
  In human-computer interaction, session management is the process of keeping track of a user's activity across sessions of interaction with the computer system....
  
  
• Identity management
  Identity management
  Identity management is a broad administrative area that deals with identifying individuals in a system and controlling access to the resources in that system by placing restrictions on the established identities of the individuals.Identity management is multidisciplinary and covers many...
  
  

See also

• Mobility management
  Mobility management
  Mobility management is one of the major functions of a GSM ora UMTS network that allows mobile phones to work. The aim of mobility management is to track where the subscribers are, allowing calls, SMS and other mobile phone services to be delivered to them....
  
  
• GSM
• Network protocol design principles
• Internet protocol suite
  Internet protocol suite
  The Internet protocol suite is the set of communications protocols used for the Internet and other similar networks. It is commonly known as TCP/IP from its most important protocols: Transmission Control Protocol and Internet Protocol , which were the first networking protocols defined in this...
  
  
• X.25 protocol suite
• OSI protocol suite
• Solution stack
  Solution stack
  In computing, a solution stack is a set of software subsystems or components needed to deliver a fully functional solution, e.g. a product or service....