| Summary: | 碩士 === 輔仁大學 === 資訊工程學系 === 95 === As the communication technology advances rapidly, the wireless communication becomes more and more popular. The first version of IEEE 802.11 standard was released in 1997. Although more advanced standards, such as IEEE 802.11a, IEEE 802.11b and IEEE 802.11g, have been evolved for greater data transmission, the medium access control mechanism of these revisions remained the same. Besides, IEEE 802.11 was originally designed for infrastructure-based network rather than ad hoc networks. Using IEEE 802.11 as the link layer protocol in ad hoc networks causes serious performance and fairness problems.
In this thesis, we first discuss the impacts on these known topologies which suffer from the fairness issues, and then propose an improved coordination mechanism to solve these problems by maintaining a neighbor list for each wireless device. Each device can decide whether to receive the frame sent by the others or not by consulting the neighbor list. Finally, we also compare our mechanism with the IEEE 802.11 using ns-2 to show that all the fairness issues in these known topologies have been improved.
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