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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/95801

    Title: H-MAC---A Channel-Hopping Based Multi-Channel MAC Protocol for 802.11 Wireless LANs
    Authors: Chang, Chih-Yung;Hwang, Lain-Jinn;Lu, Yun-Jung;Chen, Yu-Chieh
    Contributors: 淡江大學資訊工程學系
    Keywords: IEEE 802.11;Medium access control (MAC);Multi-channel;Mobile Ad hoc NETwork (MANET);Communication protocol
    Date: 2008-11
    Issue Date: 2014-02-13
    Abstract: IEEE 802.11 provides a contention-based MAC protocol for single channel wireless environment. Extending IEEE 802.11 to a multi-channel environment not only exploits the bandwidth utilization but also reduces the degree of contentions. However, each station is only equipped with a single antenna, resulting in the situation that station pairs staying on data channels can not maintain the channel usage information which only can be obtained from the control channel. The unavailability of channel utilization can further raise the channel collision problem. This study proposes an efficient 802.11 Multi-Channel MAC protocol, called H-MAC, aiming at maximizing the bandwidth utilization. The proposed protocol adopts the channel hopping sequence (CHS) mechanism to resolve the channel collision problem and reduce the message exchange overhead for switching channels. The proposed H-MAC also exploits the opportunities of spatial reuse, maintains the fairness, and possesses several characteristics including low cache overhead, fewer control packets and collision avoidance. Simulation study shows that the proposed H-MAC protocol largely improve the bandwidth utilization, delay time and throughput while maintaining fairness.
    Relation: Proceedings of the 2008 International Computer Symposium (ICS 2008),6頁
    Appears in Collections:[Graduate Institute & Department of Computer Science and Information Engineering] Proceeding

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