DocumentCode :
1028941
Title :
Efficient silence suppression and call admission control through contention-free medium access for VoIP in WiFi networks
Author :
Qaimkhani, Irshad A. ; Hossain, Ekram
Author_Institution :
Univ. of Manitoba, Winnipeg
Volume :
46
Issue :
1
fYear :
2008
fDate :
1/1/2008 12:00:00 AM
Firstpage :
90
Lastpage :
99
Abstract :
In view of the rapidly growing trend of migrating customers from traditional wired phones to mobile phones and then to VoIP services in the recent past, there is a tremendous demand for wireless technologies to support VoIP, specially on WiFi technologies which have already matured commercially. This has put forth great research challenges in the area of wireless VoIP. In this article we have addressed two core issues, efficient silence suppression and call admission control, in QoS provisioning for VoIP services in WiFi networks. In this connection we present a QoS-aware wireless MAC protocol called hybrid contention-free access (H-CFA) and a VoIP call admission control technique called the traffic stream admission control (TS-AC) algorithm. The H-CFA protocol is based on a novel idea that combines two contention-free wireless medium access approaches, round-robin polling and TDMA-like time slot assignment, and provides substantial multiplexing capacity gain through silence suppression of voice calls. The TS-AC algorithm ensures efficient admission control for consistent delay bound guarantees and further maximizes the capacity through exploiting the voice characteristic so that it can tolerate some level of non-consecutive packet loss. We expose the benefits of our schemes through numerical results obtained from simulations.
Keywords :
Internet telephony; quality of service; telecommunication congestion control; telecommunication traffic; time division multiple access; time division multiplexing; wireless LAN; QoS-aware wireless MAC protocol; TDMA-like time slot assignment; VoIP; WiFi network; call admission control; contention-free medium access; hybrid contention-free access; round-robin polling; silence suppression; substantial multiplexing capacity; traffic stream admission control; voice-over-IP; Bandwidth; Broadcasting; Call admission control; Communication system traffic control; Data communication; Delay; Internet telephony; Jitter; Media Access Protocol; Multiaccess communication;
fLanguage :
English
Journal_Title :
Communications Magazine, IEEE
Publisher :
ieee
ISSN :
0163-6804
Type :
jour
DOI :
10.1109/MCOM.2008.4427236
Filename :
4427236
Link To Document :
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