IoT as a Service. Third International Conference, IoTaaS 2017, Taichung, Taiwan, September 20–22, 2017, Proceedings

Research Article

Contention Window Size Adjustment in Unsaturated IEEE 802.11 WLANs

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  • @INPROCEEDINGS{10.1007/978-3-030-00410-1_1,
        author={Chun-Hsien Sung and Der-Jiunn Deng},
        title={Contention Window Size Adjustment in Unsaturated IEEE 802.11 WLANs},
        proceedings={IoT as a Service. Third International Conference, IoTaaS 2017, Taichung, Taiwan, September 20--22, 2017, Proceedings},
        proceedings_a={IOTAAS},
        year={2018},
        month={10},
        keywords={IEEE 802.11 Optimal contention window Dense environment Collision rate},
        doi={10.1007/978-3-030-00410-1_1}
    }
    
  • Chun-Hsien Sung
    Der-Jiunn Deng
    Year: 2018
    Contention Window Size Adjustment in Unsaturated IEEE 802.11 WLANs
    IOTAAS
    Springer
    DOI: 10.1007/978-3-030-00410-1_1
Chun-Hsien Sung1,*, Der-Jiunn Deng2,*
  • 1: Beijing Institute of Technology
  • 2: National Changhua University of Education
*Contact email: scotsung@gmail.com, djdeng@cc.ncue.edu.tw

Abstract

In next generation mobile networks, more and more throughput of network is required under the dense environment. There are some researches discuss how to solve the predicament of throughput. But they usually analyze it under the saturated environment. Most of their contention window size are also not optimal to fetch the maximum throughput. This paper is the first one to fetch the fixed optimal window size under the unsaturated environment which is closer to the real network. It is based on the Distributed Coordination Function (DCF) in Medium Access Control layer of IEEE 802.11 Wireless LAN to control the contention window size for reducing the collision problem and improving the throughput. A simplified one-dimension Markov Chain with a new idle state is proposed to simulate the unsaturated model. Then the formula of transmission probability under the unsaturated model and the equation which is used to fetch the optimized contention window size are analyzed. Comparing with the related analysis model in the simulation of the throughput and the collision rate. The result shows that the proposed model under unsaturated environment is better than before.