Enterprise solution of bandwidth optimization for multimedia transmission

To support multimedia transmission over an enterprise wireless network, in this paper we propose a B2BSIP(Back-to-Back Session Initiation Protocol) enterprise solution which provides multimedia QoS adaptation at the application layer as well as dynamic rate control at the link layer. A B2BUA (Back-to-Back User Agent) does not have any improvisation for wireless part of an enterprise network, since the QoS parameters in B2BUA primarily focus on the wired network which is deployed with enough bandwidth. This paper presents the B2BSIP server architecture to induce the quality of service for the wireless network by developing a new rate adaptation scheme that reduces the I frame occurrence of the video while meeting the delay requirement of the video and thus saving the bandwidth. Based on feedback from the wireless link layer, the algorithm identifies the optimal application layer QoS requirements and applies to the B2BUA server that lies near the wireless base station in the enterprise which leads to quick parameter adaptation. Our work is verified to work well by the ns-2 simulator that emulates the access link of mobile WiMAX systems.