Research On Next Generation Network Based On Softswitch Technology

Nowadays, PSTN, CATV networks and IP networks are linked together more closely. NGN based on Softswitch and packet switching will change such situation in future.In essence, NGN is completely different from present generation networks or previous one. NGN is an open packet network architecture following one protocol, which can serve for voice, data, video and multimedia.Softswitch Technology is the kernel of NGN, which provides call control and connection control for real-time tasks. As a new technology, the application of Softswitch will be improving for a long time.In this paper, NGN based on Softswitch technology is discussed mainly. Corresponding strategies are proposed aiming at some existent problems. Firstly, concepts, characteristics and key technologies are introduced.Secondly, Softswitch is discussed. In this part, several important protocols are compared. Thirdly, according to QoS, framework model and mechanism in NGN, a scheme of QoS based on BB are proposed and compared with the model of DiffServ without BB. Then, possible security threatening to NGN is analyzed and secure line of defence architecture of three level and corresponding security strategies are put forward. Finally, works of this paper are summarized and next progresses are pointed out.