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Journal of Computer Systems, Networks, and Communications
Volume 2008 (2008), Article ID 414073, 17 pages
Research Article

Dynamic Retransmission Limit Scheme in MAC Layer for Routing in Multihop Ad hoc Networks

LIA/CERI, University of Avignon, Agroparc, BP 1228, 84911 Avignon Cedex 9, France

Received 27 January 2008; Accepted 20 April 2008

Academic Editor: Tarik Taleb

Copyright © 2008 Ralph El-Khoury and Rachid El-Azouzi. 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.


We consider a wireless ad hoc network with random access channel. We present a model that takes into account topology, routing, random access in MAC layer, and forwarding probability. In this paper, we focus on drawing benefit from the interaction of the MAC (governed by IEEE 802.11 or slotted Aloha) and routing by defining a new cross-layer scheme for routing based on the limit number of retransmission. By adjusting dynamically and judiciously this parameter in a saturated network, we have realized that both stability of forwarding queues and average throughput are significantly improved in linear networks with symmetric traffic: a gain of 100% can be reached. While in asymmetric topology network with asymmetric traffic, we achieve a better average delay (resp., throughput) for each connection without changing the average throughput (resp., delay). In addition, we show the efficiency of our new scheme in case of multimedia applications with delay constraint. A detailed performance study is presented using analytical and simulation evaluation.