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has been cited by the following article:

• TITLE: A New Adaptive EDCA Approach to QoS of Wireless Communications

  AUTHORS: Huibin Wang, Yang Hu, Lili Zhang, Wei Xia

  KEYWORDS: Intelligent Transportation Systems, Wireless Communi-Cation, Mac Layer Protocol, Enhanced Distribution Channel Access

  JOURNAL NAME: Wireless Engineering and Technology, Vol.1 No.1, July 30, 2010

  ABSTRACT: Under the background of intelligent transportation application, QoS for various services is different in wireless com-munication. Based on the MAC layer protocol, this paper analyzes the QoS in IEEE 802.11 MAC protocol framework, and proposes a new design of a Differentiation Enhanced Adaptive EDCA (enhanced distribution channel access) approach. The proposed approach adjusts the window zooming dynamically according to the collision rate in sending data frames, makes random offset, and further distinguishes the competition parameters of the data frames that have the same priority, so as to reduce the conflict among the data frames, and improve the channel utilization. Experiments with different service cases were conducted. The simulation results show that: comparing with the conventional EDCA method, the proposed approach can ensure that high priority services are sent with priority, and the overall QoS is highly improved.