| This article mainly carries on the discussion from the soft exchange technology development and the application angle, elaborated the soft exchange system concept, the composition, the function and the service application and so on, and introduced the soft exchange technology application present situation, and take the Jilin telecommunication NGN network as an example, entered the application to the soft exchange technology to carry on the concrete elaboration.NGN network concept, characteristic and development present situation1. The NGN (NEXT GENERATION NETWORK) namely the next generation correspondence network, is take the soft exchange as the core, can provide including the pronunciation, the data, the video frequency and the multimedia services, NGN has the grouping transmission, the control function from the load bearing, the call/conversation, in the application/service separates, provision of service and the network separate, provide the opening connection, uses each basic service composition module, provides the widespread service and the application, the permission user free turning on different service provider, the fusion fixed and characteristics and so on mobile service.Therefore, until now, in the global scope, already had many telecommunication operation business, has developed positively in the NGN aspect experiment and the commercial deployment, has obtained the information industrial department correlation department's vigorously support in my NGN development.Among them, the telecommunication transmission research institute coordination network and the exchange standard study team and IP and the multimedia study teams were earlier than 2000 start, to draw up and to promulgate aspect and so on Chinese NGN system frame network equipment network agreement technology standards as well as the test standard.Was entering the net examination aspect, the information industrial department telecommunication equipment enters the net examination center also one after another to complete the partial factory soft commutation equipment in 2002 to enter the net test.Domestic each big telecommunication transportation business and so on positively has also carried out the NGN network deployment including Chinese telecommunication China Netcom 2. Soft exchange technology overall construction, agreement and technical superioritySoft exchange technology is the next generation network construction core technologiesOn generalized looked that, exchanged the system to contain the next generation network each constituent softly, was representing the entire network technical system construction, but if narrow sense looking at, SOFTSWITCH also might regard as is located the key-course the control device.The soft exchange basic meaning is (transmission level) separates the call control function from the media gateway, through the similar server function entity and the corresponding software realization basic call control function, contains the call routing, manages the control, the connection control (establishment conversation, demolition conversation), signaling intercommunication (for example from SS7 to IP).The SOFTSWITCH system technology skeleton mainly is the lamination thought, divides into the network system four, the service level, the key-course, the core transmission level, the edge turning on level.Between the level and the level uses the standard the connection to be connected.Involves the agreement includes: Media controlling agreement, service controlling agreement, internet protocol, application support agreement and so on.Analyzes SOFTWITCH the network construction, we may see the SOFTWITCH network construction the characteristic mainly to manifest in the below aspect:(1)Uses the lamination the network model.SOFTSWITCH architecture based on lamination model, between each through explicit standard opening function connection correspondence.This causes each function in the concrete realization mutually independent, does not affect mutually, any equipment promotion transformation cannot affect other various levels normal work.(2)Supports the equipment synthesis turning on.The SOFTSWITCH architecture has realized in PSTN/ISDN, PLMN, IN and INTERNET each kind of equipment synthesis turning on, meanwhile can satisfy each kind of new service terminal the turning on request.( 3 ) Realizes the formidable professional ability.The SOFTSWITCH architecture provides the new service fast through the opening standard service connection using APPLICATION SERVER.Simultaneously has also realized with the existing SCP intercommunication, has realized the existing intelligent network service inheritance and the fusion.Because the network uses the lamination system construction, therefore the service can produce independently, also the production is fast, provision of service does not need to the network other each node to carry on the modification, as soon as passes through the production, may pass through the network any edge turning on rapid supplies network use.Moreover, new provision of service may realize by the third party.(4)Provides based on the strategy network management mechanism.The SOFTSWITCH architecture provided brand-new has realized the dynamic timely network management based on the strategy network management mechanism.3.Soft exchange technology application exampleHas carried on the concrete elaboration take the Jilin telecommunication soft exchange network as the example to the soft exchange technology practical application.The Jilin telecommunication soft exchange network started in March, 2003 to construct, at present has developed into covers the entire province 9 prefectures the large-scale CLASS4 soft exchange networksConsidered the soft exchange service still at develops the initial period, the provincial level telecommunication network only suits set of platforms the cover, many platform intercommunication also has the route server and so on the many kinds of standardization the link, therefore the present soft exchange only uses Chung set of platforms; The soft exchange signaling gateway has used the centralism backup establishment, the distinction and two LSTP has carried on the intercommunication; Relays the gateway the establishment fully to consider each place service development potential the situation and each place long-distance divergence potential.The Jilin telecommunication soft exchange service development has own special and the self-innovation, along with some for instance facsimiles and so on the key technologies solution, has carried on some key big customer AG way turning on and wide range speech service turning on, at present already with emphasis developed one to pass and so on the increment services commercial. Since the Jilin telecommunication NGN network has passed through for more than 2 year to try commercial, already gradually mature.The initial period some influence network operation question already could solve.At present, the network architecture tends to the consummation, the equipment movement condition is stable, is big in the volume of users, the network situation complex situation, has undergone the long-term movement test, has met the telecommunication level application requirements. |
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