Delay-constrained adaptive early drop for real-time video delivery over IEEE 802.11 wireless networks

Abstract

he recent proliferation of mobile devices increases the demand for high-quality real-time video services in wireless network. However, the characteristics of wireless medium such as interferences and ease of congestion make it difficult for the delivered video to be played out in a timely manner. The latency introducedby those wireless characteristics severely degrades the perceptual quality of real-time videodue to intermittent playoutat the client side. In this paper, we propose adelay-constrained adaptive early drop scheme for real-time video delivery over IEEE 802.11 wireless networks. In our scheme, an intermediate router forcibly discards the less important video packetswhich are expected not to be played out in time. The simulation results demonstratethat the proposed scheme can achieve 20% lower end-to-end delay and60% less frame loss ratio with32% better Peak Signal-to-Noise Ratio (PSNR) compared to the existing cross-layer mapping schemes.