Title: Voice over Internet Protocol over IEEE 802.11 Wireless Local Area Networks and effective admission control with transmission interval adaptation

Authors: Zhuo Chen, Lingyun Wang, Xinbing Wang, Hsiao-Hwa Chen

Addresses: School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. ' School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. ' School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China. ' Department of Engineering Science, National Cheng Kung University, Tainan 22044, Taiwan, ROC

Abstract: Voice over Internet Protocol (VoIP) over Wireless Local Area Networks (WLANs) is an important application of WLANs and it has gained more and more attention recently. In this article, we analyse the maximum number of VoIP calls supportable in a WLAN and propose a new call admission control strategy, namely, Adaptive Transmission Interval Call Admission Control (ATICAC) to enhance VoIP calls in 802.11 WLANs. In ATICAC strategy, Base Station adaptively changes transmission interval of the active stations to prevent the network from saturation by controlling the average collision probability of the network. The proposed model gives a very good agreement with our simulation results. ATICAC can not only ensure the Quality of Service (QoS) of VoIP calls in 802.11 WLANs in the network, but also increase the number of VoIP calls in the network.

Keywords: call admission control; IEEE 802.11; quality of service; QoS; voice over internet protocol; VoIP; voice over wireless local area networks; VoWLANs; WLANs; network saturation; collision probability; simulation.

DOI: 10.1504/IJAACS.2008.019201

International Journal of Autonomous and Adaptive Communications Systems, 2008 Vol.1 No.1, pp.82 - 105

Published online: 02 Jul 2008 *

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