QoS of video delivered over 802.11e WLANs
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Performance evaluation of h.264 mapping strategies over IEEE 802.11e WLAN for robust video streaming
PCM'05 Proceedings of the 6th Pacific-Rim conference on Advances in Multimedia Information Processing - Volume Part II
Overview of the H.264/AVC video coding standard
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
Wireless Mesh Networks for In-Home IPTV Distribution
IEEE Network: The Magazine of Global Internetworking
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802.11 wireless local area networks are now common in the home. The 802.11e amendment allows for quality of service (QoS) provisioning over these networks to help meet the QoS demands of the growing number of multimedia applications on these home networks. The H.264 video coding standard is suitable for most multimedia applications due to its high compression and error resilience. This paper investigates how the quality of H.264 video is affected as the number of concurrent video streams sent over an 802.11e network is increased. We compare two traffic mapping schemes with and without the use of the flexible macroblock ordering (FMO) tool of H.264. We show that the mapping scheme which prioritises video packets based on their frame type is more successful at maintaining the quality of video when congestion occurs. A more gradual degradation in quality can be achieved rather than the cliff-edge drop that otherwise occurs. We also identify that errors caused by congestion tend to occur towards the bottom of each frame and that FMO can reduce this effect.