Dynamic polling mechanism for enhancing voice transmission in IEEE 802.11e wireless LANs
by Yanfeng Zhu, Zhisheng Niu
International Journal of Wireless and Mobile Computing (IJWMC), Vol. 1, No. 3/4, 2006

Abstract: In this paper, we propose a Dynamic Polling Mechanism (DPM) to enhance the system capacity in supported voice stations over IEEE 802.11e based WLANs, which employs Hybrid Co-ordination Function (HCF) to detect the silence and talkspurt alternation of voice stations and dynamically adds and removes the voice station IDs in the polling list. Apart from the existing dynamic polling mechanisms, the DPM detects the silence-to-talkspurt alternation by the reception of the first packet of each talkspurt, which contends to access channel with high Enhanced Distributed Co-ordination Function (EDCF) priority in Contention Period (CP). An analytical model is presented to investigate the access delay of the voice packets transmitted in CP and the system capacity in supported voice stations. The numerical and simulation results show that the performance of the DPM significantly outperforms that of conventional static polling mechanism. In addition, through exploring the impact of the DPM on the throughput of data stations, we conclude that the performance of the DPM can be optimised by configuring the first packet of each talkspurt with the highest EDCF priority.

Online publication date: Thu, 22-Feb-2007

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Wireless and Mobile Computing (IJWMC):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com