A New Adaptive EDCA Approach to QoS of Wireless Communications

• 作者: Huibin Wang Lili Zhang Wei Xia Yang Hu
• 来源期刊: 无线工程与技术(英文)
• 学科: 工学
• 关键词: Intelligent TRANSPORTATION Systems WIRELESS Communi-Cation Mac Layer Protocol Enhanced Distribution CHANNEL Access
• 年，卷（期）: wxgcyjsyw_2010,（1）
• 页码范围: 1-9
• 页数: 9页
• 分类号: TP39

摘要

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.