Maximizing aggregate saturation throughput in IEEE 802.11 wireless LAN with service differentiation

Authors:
A. V. Babu;Lillykutty Jacob
Affiliations:
Department of Electronics and Communication Engineering, National Institute of Technology, Calicut, India;Department of Electronics and Communication Engineering, National Institute of Technology, Calicut, India
Venue:
ICDCN'08 Proceedings of the 9th international conference on Distributed computing and networking
Year:
2008

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Abstract

In this paper, we determine class specific optimal minimum contention window (CWmin) values that simultaneously maximizes aggregate saturation throughput and provides proportional throughput differentiation meeting deterministic target throughput ratios among multiple priority classes in IEEE 802.11 wireless LAN (WLAN). We show that, with the current default CWmin setting, IEEE 802.11e Enhanced Distributed Channel Access (EDCA) cannot provide satisfactory throughput differentiation among multiple priority classes. Compared to EDCA, the proportional throughput differentiation can provide consistent and adjustable differentiation among different service classes. With these optimal CWmin values, the aggregate throughput remains maximum and insensitive to the number of active nodes in the network, thus improving the scalability of the protocol.