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Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/3332
Title: On optimal QoS-aware physical carrier sensing for IEEE 802.11 based WLANs : theoretical analysis and protocol design
Authors: Zhu, Yanfeng
Zhang, Qian
Niu, Zhisheng
Zhu, Jing
Keywords: Quality of service
Physical carrier sensing
Wireless LAN
IEEE 802.11
Issue Date: 2008
Citation: IEEE transactions on wireless communications, v. 7, no. 4, April 2008, p. 1369-1378
Abstract: In Wireless Local Area Networks (WLANs), traditionalPhysical Carrier Sensing (PCS), which aims at eliminating hidden terminals completely, brings too many exposed terminals and degrades the throughput seriously. Some existing work has proven that an aggressive PCS, which turns up the PCS threshold to allow the existence of hidden terminals, can improve the throughput by balancing the tradeoff between hidden terminals and exposed terminals. However, little work has been conducted to compute the optimal PCS threshold. To address this issue, in this paper we develop an analytical model, which can be used to compute the optimal PCS threshold and investigate the impact of the aggressive PCS on the Quality-of-Service (QoS) in terms of the packet loss rate. Then, we propose a QoS-aware aggressive PCS tuning algorithm, with which users can adapt the PCS threshold to the varying network conditions and the QoS requirement. Extensive simulation results show that the proposed algorithm obtains significant throughput gain compared to the traditional PCS and bounds the packet loss rate below the QoS requirement. The unfairness issue brought by the aggressive PCS is also discussed and evaluated with experimental results at the end of the paper.
Rights: © 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
URI: http://hdl.handle.net/1783.1/3332
Appears in Collections:CSE Journal/Magazine Articles

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