Performance evaluation of SIP based voice conferencing over the IEEE 802.11 wireless networks

There are various types of conferencing models to transfer multimedia data such as voice and video, but they all have certain limitations when applied to the IEEE 802.11 wireless networks using handheld devices. To address these, we have proposed a conferencing architecture that improves the user scalability. We simulated the traditional Session Initiation Protocol based on existing conferencing models and our proposed conferencing model under different number of users using the Optimum Network Engineering Tool. We implemented a process node model in the application layer to create our conferencing server model. We conducted a series of simulation scenarios to measure the performance of the conferencing models in terms of user scalability and QoS. We also demonstrated how the mobile users affect the conferencing performance. Our simulation results indicate that our proposed conferencing model provides a more flexible way to expand the conferencing user scale while maintaining the required QoS.