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Performance analysis of multi‐criteria CAC for distributed access point selection in WLANs

I‐Shyan Hwang (Department of Computer Engineering and Science, Yuan‐Ze University, Taiwan, Republic of China)
Chien‐An Chen (Department of Computer Engineering and Science, Yuan‐Ze University, Taiwan, Republic of China)

International Journal of Pervasive Computing and Communications

ISSN: 1742-7371

Article publication date: 31 December 2007

194

Abstract

Purpose

Wireless local area networks (WLANs) are the predominant option for broadband wireless access network, and multiple access points (APs) will be much more available for wireless stations (WSTAs). Call admission control (CAC) on AP selection problem over 802.11 WLAN is a critical issue. In the existing architecture, strongest‐signal‐first is the default AP selection mechanism in 802.11 WLAN which uses the single criterion, received signal strength indicator, to select AP. However, this method suffers from bandwidth deficiency and unbalanced load among APs due to the uneven distribution of user load, thus degrading the system throughput. Instead, the purpose of this paper is to propose a multi‐criteria CAC on AP selection algorithms.

Design/methodology/approach

The distributed multi‐criteria considered in order are RSSI, minimum required bandwidth of WSTA, estimated effective bandwidth (EEB) and AP‐WSTA distance. A semiMarkov model considering both packet retransmission limit, packet error rate and collision effect is proposed to predict the system throughput and validated through simulation results. Two multi‐criteria AP selection algorithms after EEB is evaluated are proposed and compared based on this analytical model.

Findings

The proposed algorithms outperform the traditional SSF algorithm in terms of the balance index for AP and the average system throughput.

Originality/valve

The paper presents performance analysis for multi‐criteria CAC for distributed access point selection in WLANs.

Keywords

Citation

Hwang, I. and Chen, C. (2007), "Performance analysis of multi‐criteria CAC for distributed access point selection in WLANs", International Journal of Pervasive Computing and Communications, Vol. 3 No. 3, pp. 257-273. https://doi.org/10.1108/17427370710856228

Publisher

:

Emerald Group Publishing Limited

Copyright © 2007, Emerald Group Publishing Limited

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