Advances in Multimedia

Advances in Multimedia / 2007 / Article
Special Issue

Cross-layer Optimized Wireless Multimedia Communications

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Research Article | Open Access

Volume 2007 |Article ID 90879 | 11 pages | https://doi.org/10.1155/2007/90879

Asymptotic Delay Analysis for Cross-Layer Delay-Based Routing in Ad Hoc Networks

Academic Editor: Haohong Wang
Received21 Dec 2006
Revised20 Apr 2007
Accepted14 May 2007
Published27 Jun 2007

Abstract

This paper addresses the problem of the evaluation of the delay distribution via analytical means in IEEE 802.11 wireless ad hoc networks. We show that the asymptotic delay distribution can be expressed as a power law. Based on the latter result, we present a cross-layer delay estimation protocol and we derive new delay-distribution-based routing algorithms, which are well adapted to the QoS requirements of real-time multimedia applications. In fact, multimedia services are not sensitive to average delays, but rather to the asymptotic delay distributions. Indeed, video streaming applications drop frames when they are received beyond a delay threshold, determined by the buffer size. Although delay-distribution-based routing is an NP-hard problem, we show that it can be solved in polynomial time when the delay threshold is large, because of the asymptotic power law distribution of the link delays.

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Copyright © 2007 Philippe Jacquet et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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