| In the process of the telecommunication network developing towards NGN, the Softswitch technique has been widely used. In the marketing structure of drastic competition in 3G service area, the security of the core network equipments become more and more important. How to give the disaster recovery solution of the core network equipment and how to construct a safe, stable and reliable mobile network is the most important problem of the 3G network construction and operation of the China Unicom. To improve the security of core network and provide high quality service, the research and application of disaster recovery solution is obviously very important.Firstly, this thesis presents in the key technique of the core network CS area, and the research work developed in several aspects, such as the system structure of Softswitch, the protocol structure of Softswitch technique and the protocols of Softswitch technique. Based on the research of Softswitch technique, the thesis focuses on the disaster recovery technique in the core network. Through the analysis in the development of 3GPP core network structure, the thesis gives the concealed defect of the core network that is in the R4 structure and provides the disaster recovery solution that is based on the WCDMA core network layers. Secondly, based on the network situation of the China Unicom Fujian branch, the suitable Dual Homing disaster recovery solution is applied to the end office and the Softswitch toll office. With the practice of the solution, the feasibility of the disaster recovery solution in every layer is researched. Finally, the disaster recovery solution of the future network is investigated. |
