A Novel Queue Scheduling Scheme for Video Transmission over IEEE 802.11e WLAN

With the widespread applications of mass media and the rapid development of wireless network, much attention has been paid to wireless video transmission. In this paper, we consider video transmission in IEEE 802.11e WLAN, and propose an adaptive cross-layer scheduling scheme to reduce video distortion. The cross-layer scheduling algorithm propose a scheme, namely, Relative Minimum Distortion Buffer Management (RMDBM). In RMDBM, network loads and service rates are taken into account to realize the cross-layer dynamic queue access. We evaluate the cross-layer scheduling in ns-2 and simulation results demonstrate significant performance gain of the cross-layer scheduling algorithm. In the case of different network loads, our proposed scheduling algorithm achieves lower video distortion than pure 802.11e EDCA, static mapping scheme and conventional adaptive scheme. In the case of non-video influence, the proposed scheduling scheme can effectively reduce the negative impacts on video transmission performance from non-video stream data.