Simulation of SIP Supported Soft Handover between Enterprise Networks and IP Multimedia Subsystem

Abstract

Providing seamless mobility support is one of the most challenging problems towards the system integration of fourth generation (4G) wireless networks. IP Multimedia Subsystem (IMS) is envisioned to be the common platform for service provisioning in heterogeneous networks. A variation of the Session Initiation Protocol (SIP) is proposed for session control in cellular networks based on the IMS architecture. SIP is also used in many enterprise networks with 802.11 wireless accesses. The interconnection of these two SIP-based networks for extended coverage and persistent service is one of the promising steps for heterogeneous network convergence. A solution for migrating existing sessions between these two networks, known as vertical soft handover is proposed in this thesis. This thesis focuses on the handover procedure between Enterprise network and IMS. Here the proposed architecture is implemented with the help of OpenSER, Asterisk and analyzed using Wireshark network analyzer. The analysis of captured packets is done to measure QoS parameters like Required Bandwidth for SIP call, Packet loss, Delay & Jitter, and also used for evaluate Registration time & Call set up time.