| 摘要(英) |
In WiMAX network, SS has to send bandwidth request to BS before transmitting data. After SS gets the allocated bandwidth from BS, SS is allowed to upload data. There are three methods to send bandwidth request, including unicast polling, multicast polling, and broadcast polling. In this paper, we focus on the multicast polling issue and divide different quality of services(nrtPS、BE) into several multicast polling group. When the numbers of SSs are increasing, the more collisions occur while at least two SSs send bandwidth request at the same time so that BS cannot receive bandwidth request. Therefore, BS is unable to know that whether SS has encountered collision during transmitting bandwidth request. Based on the reasons motioned before, this paper gives different weight to collision state for qualifying the degree of collision. The collision state is recorded by the SS’’s MAC BR header when SS sends bandwidth request to BS. Therefore, BS can calculate the length of contention window for the group. In addition, we also proposed a method that has joins a beta to count the length of contention window, The method promotes high priority group to send bandwidth request effectively.
The paper provides a brief overview of WiMAX network standard at the beginning and presents the multicast polling group contention mechanism. Then the paper proposes a method to calculate the ratio of contention window of a multicast polling group, and compares the average value of bandwidth request and the allocation of contention window with different weight between different QoS and different priority for different group.
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| 參考文獻 |
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[12] L. Lin, W. Jia, and W. Lu, “Performance Analysis of IEEE 802.16 Multicast and
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[13] Fallah, Y.P. Agharebparast, F. Minhas, M.R. Alnuweiri, H.M. Leung, V.C.M.“Analytical Modeling of Contention-Based Bandwidth Request Mechanism in IEEE 802.16 Wireless Networks,” Vehicular Technology, IEEE Transactions on Publication Date: Sept. 2008, p 3094 – 3107.
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