A study on QoS enhancement of MPEG-4 video transmission over Wireless Mesh Network

Recently there is tremendous growth in the applications that require video streaming over wireless networks. Enhancing and maintaining the video quality over IEEE 802.11e Wireless Mesh Networks is one of the challenging tasks. Quality of video is affected by varying channel conditions, interference from the neighboring nodes and several problems created by wireless links. This review paper discusses the approach which implements cross-layer design that enhances the quality of MPEG-4 video transmission by optimizing the control parameters across the different protocol layers. Multimedia transmission has constraints on delay whereas the normal traffic has constraints on loss. Routing protocol must be modified so as to add proper routing metric depending on the content at the application layer. Hence by dynamically adapting the routing metrics- Expected Transmission Count (ETX) metric and hopcount, best QoS route can be selected. This approach improves the performance of network with respect to parameters such as throughput, average end-to-end delay, packet delivery ratio, average peak signal to noise ratio.