Anhui(chaohu)unicom Soft-switch Core Network Designing And Analyzing

With the continuous development of Internet economy and IP technologies in the 21st century and the fast increasing of mobile services and the arriving of 3G, the amount of mobile services overpasses that of fixed networks. PSTN audio service is greatly challenged by IP services. The emerging of softswitch based Next Generation Network (NGN) provides the PSTN telecommunication operators with an opportunity of their technical transformation and strategic development as well as a hope of revival.Mobile soft- switch is to lead the soft-switch into mobile network, accommodate soft-switch the laye for the next generation separation mobile network construction trend. Mobile soft-switch is a separation that passes to mobile network CS Domain bearer and control,and assemble control and scatters access, becoming the core network programming principle of a net of clear layering, matching the direction of the network development; Lead into the IP loads the speech,making use of the IP address ability of carry to carry,to form the net structure between media gateway, be advantageous to the simplification network structure; The mobile soft-switch that adopts IP bearer can carry out the method of network construction, lowering to construction costs of the net and the operation costs,provide abundant business and functions,and can acheive smothe volution from the existing mobile network to the nextgeneration network.First of all, a systematic description is given of WCDMA system architecture, interface protocols,and introduce softswitch system architecture, interface protocols and functional structure. Then targeting to Anhui(Chaohu) unicom 3G core network of the Fourth-period project, a study is conducted on the planning of softswitch transformation of mobile 3G core network, including the network element provisioning and their capacity prediction, network bandwidth prediction, and planning of operation and maintenance system. Finally the thesis investigates the service application of softswitch network and discusses the issues of network security and investment efficiency.