Contention window size adjustment in unsaturated IEEE 802.11 WLANs

Chun Hsien Sung, Der-Jiunn Deng

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationIoT as a Service - Third International Conference, IoTaaS 2017, Proceedings
EditorsYi-Bing Lin, Ilsun You, Der-Jiunn Deng, Chun-Cheng Lin
PublisherSpringer Verlag
Number of pages8
ISBN (Print)9783030004095
Publication statusPublished - 2018 Jan 1
Event3rd International Conference on IoT as a Service, IoTaaS 2017 - Taichun, Taiwan
Duration: 2017 Sep 202017 Sep 22

Publication series

NameLecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST
ISSN (Print)1867-8211


Other3rd International Conference on IoT as a Service, IoTaaS 2017

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications

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