Multi-hop delay performance in wireless mesh networks

Authors:
Yu Chen;Jia Chen;Yang Yang
Affiliations:
Department of Electronic and Electrical Engineering, University College London, London, UK;Department of Electronic and Electrical Engineering, University College London, London, UK;Department of Electronic and Electrical Engineering, University College London, London, UK
Venue:
Mobile Networks and Applications
Year:
2008

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Abstract

Wireless Mesh Network (WMN) technology is an attractive solution to meet the demand of broad-band network access anywhere and anytime. In order to effectively support delay-sensitive applications such as video streaming and interactive gaming in a WMN, it is crucial to develop feasible methodologies and techniques for accurately analyzing, predicting and guaranteeing end-to-end delay performance over multi-hop wireless communication paths. In this paper, we extend the link-layer effective capacity model and derive a lower bound of delay-bound violation probability, or complementary cumulative distribution function, over multi-hop wireless connections. A fluid traffic model with cross traffic and a Rayleigh fading channel with additive Gaussian noise and Doppler spectrum are considered in our study. The average multi-hop delay and jitter performance bounds are also obtained. Analytical results are verified by extensive computer simulations under different traffic load and wireless channel conditions. We find that multi-hop delay performance is much more sensitive to traffic load and maximum Doppler rate than traffic correlation.