Information Technology Reference
In-Depth Information
Chapter 20
FH-MAC:
A Multi-Channel Hybrid MAC Protocol
for Wireless Mesh Networks
Djamel Tandjaoui
Center of Research on Scientific and Technical Information, Algeria
Messaoud Doudou
University of Science and Technology Houari Boumediène, Algeria
Imed Romdhani
Napier University School of Computing, UK
ABSTRACT
In this article, the authors propose a new hybrid MAC protocol named H-MAC for wireless mesh net-
works. This protocol combines CSMA and TDMA schemes according to the contention level. In addition,
it exploits channel diversity and provides a medium access control method that ensures the QoS require-
ments. Using ns-2 simulator, we have implemented and compared H-MAC with other MAC protocol
used in Wireless Network. The results showed that H-MAC performs better compared to Z-MAC, IEEE
802.11 and LCM-MAC.
INTRODUCTION
MAC protocols for wireless networks suffer
from many problems such as scalability; data
throughput degrades significantly when increas-
ing the number of nodes or hops in the network.
Furthermore, many other MAC problems persist
for example the interference effect and radio
channel allocation strategies. These problems are
caused by using advanced radio technologies such
as directional antenna, omnidirectional antenna
and multi-channel/multi-radio systems. Thus,
Wireless mesh networks are an attractive field for
several research labs, and they were the subject of
many papers in the few last years. These intensive
works try to solve different open issues which
concern mainly the capacity of the wireless mesh
network protocols, and especially MAC protocols
capacity (Akyildiz, Wang and Wang, 2005).
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