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Performance analysis under finite load and improvements for multirate 802.11

Cantieni, G. R. and Ni, Q. and Barakat, C. and Turletti, T. (2005) Performance analysis under finite load and improvements for multirate 802.11. Computer Communications, 28 (10). pp. 1095-1109. ISSN 0140-3664

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Abstract

Automatic rate adaptation in Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) wireless networks may cause drastic throughput degradation for high-speed bit rate stations (STAs). The CSMA/CA medium access method guarantees equal long-term channel access probability to all hosts when they are saturated. In previous work it has been shown that the saturation throughput of any STA is limited by the saturation throughput of the STA with the lowest bit rate in the same infrastructure. In order to overcome this problem, we first introduce in this article a new model for finite load sources with multirate capabilities. We use our model to investigate the throughput degradation outside and inside the saturation regime. We define a new fairness index based on the channel occupation time to have more suitable definition of fairness in multirate environments. Further, we propose two simple but powerful mechanisms to partly bypass the observed decline in performance and meet the proposed fairness. Finally we use our model for finite load sources to evaluate our proposed mechanisms in terms of total throughput and Medium Access Control layer delay for various network configurations. (c) 2004 Elsevier B.V. All rights reserved.

Item Type: Article
Journal or Publication Title: Computer Communications
Uncontrolled Keywords: IEEE 802.11b ; Wireless LAN ; Stochastic processes ; Queueing theory ; Network measurements
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Departments: Faculty of Science and Technology > School of Computing & Communications
ID Code: 59629
Deposited By: ep_importer_pure
Deposited On: 19 Nov 2012 10:22
Refereed?: Yes
Published?: Published
Last Modified: 19 Nov 2012 10:22
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/59629

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