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IP multimedia system, is a new form of multimedia services, it is now able to meet the end customers more innovative, demand more diverse multimedia services. Currently, IMS is considered to be the core technology of the next generation network, but also to solve the mobile and fixed network integration, the introduction of differentiated services important listingbook way voice, data and video triple fusion. IMS version proposed in 3GPPRelease 5, is the IP multimedia services for network core logic functional entity control in general. The main definition of the core structure of IMS 3GPP R5, NE functions, interfaces, and processes such as content: R6 version adds part of the IMS service features, specifications IMS interworking with other networks and wireless local area network (WLAN) access characteristics; R7 enhanced version for fixed-mobile convergence standardized formulation requires IMS support digital subscriber line (xDSL), cable modem and other fixed access. IMS and softswitch biggest difference lies in the following aspects. (1) Based on Softswitch control and bearer on, IMS further realizes the separation of call control layer and the service control layer; (2) IMS originated in the application of mobile communication networks, so fully considered for mobility support, and adds an external database - Home Subscriber listingbook Server (HSS), for user authentication and protection of user traffic to trigger the rule; (3) IMS all using the Session Initiation Protocol (SIP) as the call control and service control signaling while in Softswitch, SIP call control but can be used for a variety of protocols, more use of the media gateway protocol (MGCP) and H.248 protocols. In general, the difference between IMS and softswitch listingbook is mainly on the network architecture. Softswitch network architecture based on master-slave control features, making it closely with a particular means of access, and the IMS system as a result of the terminal and the core-side SIP-based IP bearer protocol, IP technology and media-independent features that make carrying IMS system can support a variety of access methods, so that the IMS applications ranging from the initial mobile network gradually expanded to the fixed area. In addition, due to the IMS architecture can support mobility management and has a certain quality of service (QoS) guarantee mechanism, so compared to the advantages of IMS softswitch technology listingbook is also reflected in the user's roaming broadband QoS management and security.
In the IMS architecture, the lowest level of the carrier layer, for providing IMSSIP session access and transmission, bearer network must be based on packet switching. Figure way to carry mobile packet network, for example, listingbook describes the IMS IMS users via phone conversation the way, the main bearer layer equipment SGSN (GPRS service support node), GGSN (Gateway GPRS Support Node business) and MGW (Media Gateway). SGSN and GGSN which can be reused existing network equipment does not require hardware upgrades, just by doing the configuration can support IMS. MGW is responsible for media streams in the IMS domain and CS (Circuit Switched) domain interworking listingbook function entity, mainly to solve the problem of voice interoperability. Regardless of what kind of specific access, as long as the IP-based technology, all the IMS subscriber signaling can be well transmitted to the control layer. listingbook The middle layer of the signaling control layer, the network control listingbook server, is responsible for managing the call or session setup, modification and release signaling control all IP multimedia services are done in this layer. The main functional entities have CSCF, HSS (HomeSubscriberServer, Home Subscriber Server), MGCF, etc., these network elements to perform different roles, such as the signaling control server, the database, the media gateway server, etc., for signaling the level of synergistic processing functions, e.g. set up a SIP session release. This layer is responsible only for IMS signaling, the final IMS traffic does not pass through this layer, completely done by the underlying carrier layer routing-end communications.
The top layer is the application layer, the application and content servers, IMS is responsible for providing value-added services for users, mainly NE is a series of multimedia services provided by CAMEL, OSA / Parlay and SIP technology platform. Some operators can develop their own SIP-based applications via standard SIP and IMS system interface; if SP operators need to connect third-party applications, IMS can and standard API, such as OSAAPI connection through OSA / ParlayGW third-party listingbook non- SP business of trust, such as authentication and management. The main application of IMS 1.IP media business type
A third typical application is the integration of applications, mainly in the integration of WLAN and 3G, in order to implement the voice service continuity. In this manner, the user has a dual-mode terminal WLAN / W CDMA is, in the WLAN coverage area, generally prefer to use WLAN access, because in this way a user use lower service charges, more adequate bandwidth listingbook data services . After leaving the WLAN coverage area, the terminal listingbook will automatically switch to WCDMA network, enabling voice continuity between listingbook WLAN and WCDMA. listingbook Currently, this solution is less commercial, but many operators are taking the test.
With the development and evolution of communications networks, convergence is inevitable theme of integration of fixed and mobile (FMC) is an urgent problem to be solved. ETSI to FMC under the definition is: "Fixed mobile convergence is independent of access technology capable of providing network capacity and it does not mean necessarily physical listingbook network integration, but only care about network architecture and a fusion. appropriate standards. These standards can be used to support the fixed services, mobile services and fixed-mobile listingbook hybrid business. An important feature of fixed-mobile convergence is the service subscription and enjoy the business users from different access points and terminals the separated, to permit a user from any fixed or mobile terminal, access the same services via any compatible access point, including the roaming can be obtained when the same traffic. "ETSI defined at the same time to the FMC also on the convergence of fixed and mobile networks put forward the corresponding requirements.
IMS further promote the softswitch architecture business and control the separation, the separation of control and bearer of thought, were more than sufficient softswitch network depolymerization, listingbook network structure more clear and reasonable. Network solution at all levels continue to gather the overall listingbook trend is the development of the telecommunications network. Poly network solution makes vertical business model is broken, is conducive to the development of business; in addition, different types of networks depolymerization also re-create the conditions for the network at different levels of aggregation. This re-aggregation, is the network integration process. Use IMS to achieve fixed access and mobile access, unified core control, mainly IMS has the following characteristics.
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