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Modeling the Effect of Forwarding in IEEE-802.11e-Based Ad Hoc Networks with Weighted Fair Queueing
Ralph El-Khoury and Rachid El-Azouzi

We present in this paper a model that takes into account topology, routing, random access in MAC layer governed by IEEE 802.11 and forwarding probability. We are focusing to study the effect of cooperation and PHY/MAC layers (such as transmit power and physical carrier sense) on the stability and throughput of ad-hoc network. In this paper, we first extended the results of Yang’s model [1] to a multi-hop ad-hoc network with asymmetric topology and traffic load. Based on this analysis, we reach a fixed-point formulation which characterizes the system operating points and allows us to compute the attempt rate of MAC layer which depends on the traffic flows on the network layer.With the use of the analytical model derived, we use an approach to derive throughput of multi-hop routes and stability of forwarding queues. However, in this paper, we get extended results for general network case.

Keywords: Ad-hoc networks, cross layer, performance evaluation, stability, IEEE 802.11.

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