Enhancing QoS of voice over WLANs

Voice over IP (VoIP) service is emerging as a popular application in wireless local area networks (WLANs). However, the existing rate adaptation (or link adaptation) schemes for WLANs have been developed to improve the throughput of data traffic, not the quality of service (QoS) of VoIP traffic. In...

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Bibliographic Details
Published in2012 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM) pp. 1 - 9
Main Authors Byoungjin Kim, Hyewon Lee, Seongho Byeon, Kwang Bok Lee, Sunghyun Choi
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2012
Subjects
Delay
Fading
IEEE 802.11
IEEE 802.11 Standards
Quality of service
quality of service (QoS)
Radiation detectors
rate adaptation
voice over IP (VoIP)
Wireless communication
Wireless LAN
WLAN
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Summary:Voice over IP (VoIP) service is emerging as a popular application in wireless local area networks (WLANs). However, the existing rate adaptation (or link adaptation) schemes for WLANs have been developed to improve the throughput of data traffic, not the quality of service (QoS) of VoIP traffic. In this paper, we investigate the characteristics of VoIP traffic and the limitations of state-of-the-art rate adaptation schemes, and then enhance the QoS of voice over WLANs (VoWLANs) by ameliorating the existing rate adaptation schemes. Specifically, we design fast decrease to control the transmission rate of retransmissions, and retry scheduling to avoid the deep fading of the wireless channel as well as hidden terminal interference. We comparatively evaluate the QoS of the revised rate adaptation schemes via ns-3 simulations and MadWiFi implementations in various communication environments, and demonstrate that the proposed scheme improves the R-score performance by up to 80% depending on the network scenarios.
ISBN:9781467312387
146731238X
DOI:10.1109/WoWMoM.2012.6263693