Title: An energy-efficient transmission mechanism for VoIP over IEEE 802.11 WLAN
Authors: Tsao, Shiao-Li
Huang, Chung-Huei
Department of Computer Science
Keywords: voice over IP (VoIP);VoIP over WLAN (VoWLAN);low power;cross-layer design;WLAN
Issue Date: 1-Dec-2009
Abstract: Voice over IP (VoIP) over WLAN (VoWLAN) is an important application for public and private WLANs. However, VoWLAN systems suffer from several technical challenges such as power consumption of a WLAN station (STA) and service capacity of an access point (AP), making the commercial deployment of a large-scale VoWLAN service problematic. This study presents a cross-layer and energy-efficient mechanism for transmitting VoIP packets over IEEE 802.11 WLAN. The proposed mechanism considers the characteristics of voice packets that call tolerate certain loss, and dynamically disables the medium access control (MAC) layer acknowledgement for voice packets. In doing so, the time and energy consumed to transmit and receive voice packets for an STA call be reduced. Simulation results demonstrate that the mechanism improves the energy efficiency of a VoWLAN STA and WLAN utilization without sacrificing voice qualities. Copyright (C) 2009 John Wiley & Soils, Ltd.
URI: http://dx.doi.org/10.1002/wcm.747
ISSN: 1530-8669
DOI: 10.1002/wcm.747
Volume: 9
Issue: 12
Begin Page: 1629
End Page: 1644
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