NDLI: Adaptive QoS control approaches for VoIP over multi-rate WLANs

Content Provider	IEEE Xplore Digital Library
Author	Kazemitabar, H. Said, A.M.
Copyright Year	2012
Description	Author affiliation: Universiti Teknologi PETRONAS, Bandar Seri Iskandar, 31750 Tronoh, Perak, Malaysia (Kazemitabar, H.; Said, A.M.)
Abstract	IEEE 802.11 is the most popular standard for WLAN networks. It offers different physical transmission rates. This paper focuses on this multi transmission rate of 802.11 WLANs and its effect on speech quality. In non-adaptive systems, when the physical layer switches from a higher transmission rate to a lower one, different than the one that the VoIP flow needs, the switching may result in congestion, high delay and packet loss, and consequently speech quality degradation. However, there are some algorithms that adapt the transmission parameters according to the channel conditions. In this study we demonstrate how choosing parameter (different codec and packet size) can affect the voice quality, network delay and packet loss. Further, this study presents a comparison between adaptive and non-adaptive methods. The adaptive method has also been evaluated for different congestion level from perceived speech quality point of view.
Starting Page	790
Ending Page	795
File Size	967012
Page Count	6
File Format	PDF
ISBN	9781467319379
e-ISBN	9781467319386
DOI	10.1109/ICCISci.2012.6297134
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-12
Publisher Place	Malaysia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive rate control algorithm IEEE 802.11 Codecs Codec Multi-Rate WLAN QoS Bit rate Bandwidth VoIP Speech Packetization interval Delay
Content Type	Text
Resource Type	Article

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