Study And Design Of SIP-Based Mobility In Next Generation Network

As a convergence of telecom network and Internet, Next Generation Network encounters the mobility support as well. This paper concentrates on exploring the SIP protocol, especially the SIP mobility support issue, on the basis of which and in accordance with the specific characteristics of telecom and Internet, all kinds of frameworks are presented hoping to improve the mobility support of SIP.The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol distributed by IETF. As one of the two standards for constructing VOIP (Voice over IP) system, SIP is becoming focus because being simple, flexible and open. It is one of the essential protocols to implement Next Generation Network (NGN).The paper discusses some mobility management solutions corresponding to four types of mobility scenarios, i.e. terminal mobility, session mobility, personal mobility and service mobility. Because terminal mobility is the one that happens most frequently, and it's the hardest one to be realized by SIP, this paper pays most of attention to proposing mobility solutions for it. The signaling process for terminal mobility is first described, and then the paper the other three mobility types in short as the SIP protocol is well fitted to support their mobility management.Some ways are brought forward according to the corresponding kinds of mobility scenarios. For example, dedicated terminal server method, third-party call control, and REFER mechanism are used to support all kinds of session mobility scenarios.