Design and Evaluation of a Window
نویسندگان
چکیده
The proliferation of wireless devices calls for a suitable network infrastructure for supporting communication among them. Medium Access Control(MAC), the most crucial part of the protocol stack, is discussed in the thesis. The design of wireless MAC protocols is signi cantly di erent from wired MAC protocols because of distinctive features of wireless medium, such as high error rates, limited radio propagation range and low bandwidth. An e cient, scalable and fair protocol { Wireless Window Protocol(WWP) { is proposed. WWP is a limited contention protocol in which the set of contending mobiles is chosen based on a global contention window maintained by every mobile station. The contention window is adjusted based on three possible channel states: no transmission, success and collision. Window bounds are functions of current channel load. Simulations have shown that WWP can resolve contention in an average of 2:4 contention slots, independent of the number of contending stations. The access delays for each station under heavy load is exponentially distributed, both in a single-cell and multi-cell scenarios. We show that the performance of WWP is superior as compared to the distributed coordination function of IEEE 802:11 draft standard.
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تاریخ انتشار 1997