A QoS Enhancement Scheme through Joint Control of Clear Channel Assessment Threshold and Contending Window for IEEE 802.11e Broadcasting

Author:

Chen Chen12ORCID,Zhao Honghui1ORCID,Xiang Hongyu1ORCID,Sun Canding1,Sui Jisheng3,Zhu Lijun3,Wang Shengda3,Cong Li3,Zhou Yang4

Affiliation:

1. State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an 710071, China

2. Xidian-Ningbo Information Technology Institute, Ningbo 315200, China

3. Information and Communication Company, Jilin Electric Power Company Limited, Changchun 130021, China

4. Ministry of Water Resources Information Center, Beijing 100053, China

Abstract

In a WLAN, when a great many nodes coexist, the network may readily be congested, thus causing packets dropping and network performance degradation. To solve this issue, a lot of schemes have been proposed. However, most of the previous works attempt to avoid the possible channel congestion by controlling the packets generation rate and/or transmitting power of nodes, while the effects of Clear Channel Assessment (CCA) threshold are not well examined. In our paper, a Joint CCA threshold and contending window control algorithm (JCCA) is proposed to avoid channel congestion or reduce the congestion probability of broadcasting in an IEEE 802.11e network. Both the network conditions and the priorities of messages are taken into account to improve the broadcasting performance in our paper. According to the simulation results, it can be concluded that our scheme can significantly increase the network throughput as well as packets delivery ratio and reduce the packet transmission delay compared to the IEEE 802.11e and Adaptive Carrier Sensing-Based MAC Designs (ACSBM) protocol.

Funder

National Natural Science Foundation of China

Publisher

Hindawi Limited

Subject

Computer Networks and Communications,Computer Science Applications

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