IMS (IP Subsystem) essentially say in a network structure. The technology is rooted in mobile field, was originally for mobile network defined the 3GPP, while in NGN framework, IMS should also support fixed access and mobile access. At present the IMS enhancement 3GPPR6 covering basic already frozen, marks the IMS technology have to mature.
In the framework of NGN, terminal and access network is various, and its core network only, the core of a IMS SIP protocol and characteristic is adopted with access irrelevance.
Conform to the trend of network IP, IMS system USES SIP protocol to end-to-end call control. IP technology in the Internet application has been very mature, is the leading technology, Internet and it convenient to provide various information service flexibly, and can according to customer's need to quickly create new services. But one of the most prominent IP technology feature is "do our best", in the security of data transmission and billing control, but ragged, and only consider fixed the access method. Based on the traditional circuit switching mobile network, albeit with access flexibility, can the phonetic anytime and anywhere, but unable to exchange support IP technology, so can form a vertical business launched way, different business application interoperability is lower and the need to more business gateway access mobile communication network. Different business separately business access, networking and operation control and business application development, including even such main network business charging units are must establish independent operation system. So, until now telecom business mainstream is still voice business. The deployment of new business, in the present condition is very easy to incur greater risks and costs. In this case, whether YiDongWang or fixed nets are based on IP network evolution to an inevitable trend, has become.
However will IP technology is introduced into the telecommunication level field, we must consider the actual network operation to operators of demand, need from nets yuan IMS network function, interface protocols, QoS and safety, billing the aspects of fixed access support. From the current research look, SIP is a simplicity, compatibility, modular design and third-party control based on Internet communications market to become the mainstream of the agreement. So based on SIP IMS framework through the utmost reuse Internet technologies and protocols, inheritance of cellular mobile communication system network technology and fully endemic soft exchange network technology for reference, so it can provide the QoS guarantee, telecommunication level of business and effective flexible pricing, and with a fusion of the powerful ability comprehensive network business. So, using the IMS system, telecommunications operator can low cost into its have long sought mobile field, and mobile operators can be in guarantee its original voice and text message service quality is not affected, relaxed under the premise of the rich multimedia introduced new business, the so-called whole business operations.
As for access irrelevance, refers to the soft exchange network technology IMS reference image based on the gateway, solutions, including signaling gateway (SGW), media gateway (MGW), media gateway controllers (MGCF), and in such nets yuan MGCF and MGW also adopt the IETF and ITU - T together to develop of h. 248 / MEGACO agreement. Such design makes the IMS system terminal can be mobile terminal, also can be fixed telephone terminal, multimedia terminal, PC, etc, access is not limited to cellular rf interface can be is wireless WLAN, or cable LAN, DSL technologies. In addition, because in business floor adopts an IMS the soft exchange network open business provides frame, can fully support based on the application server third-party service provision, which means operators may not to change the existing network structure, don't put any equipment costs conditions, easily develop new business, and applied upgrades.
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