Indian Journal of Science and Technology

Abstract

Objective: The video transmission over Wireless LAN (WLAN) requires the better Quality of Service (QoS). Over the time varying characteristics of WLAN, better QoS requirement for the video applications makes it a more challenging task. Presently IEEE802.11n standard is in use for supporting WLAN with the main goal to provide higher throughput. In IEEE 802.11n, the main emphasis is on achieving higher throughput. However, real time video applications such as video conferencing are more sensitive to delay, so an adequate provision has to be imposing at MAC layer of IEEE802.11n to overcome the delay dependencies of video traffic. Methodology: We proposed an adroit buffer augmentation methodology for the reliable H.264/SVC video codec transmission over WLAN. The proposed methodology dynamically adjusts the video queue length (AC [VI]) at MAC layer and there after use cross-layer mapping. The dynamically adjustment of video queue length is achieved by measuring the traffic congestion. Findings: After exhaustive experimental simulations, the obtained result shows that our proposed methodology performs better than the conventional video transmission schemes. Application: The proposed methodology can be imposed at IEEE 802.11 MAC for achieving better video quality.

Keywords: Cross-Layer Mapping, EDCA, IEEE802.11n, QoS, Video Over WLAN