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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/35197

    Title: 在單一收發器之無線隨意網路中,設計一管線化多重頻道媒體存取控制協定以避免資料碰撞
    Other Titles: π-mc: pipelining multi-channel MAC protocols with single transceiver for data collision free in wireless Ad hoc networks
    Authors: 劉書聖;Liu, Shu-sheng
    Contributors: 淡江大學資訊工程學系資訊網路與通訊碩士班
    石貴平;Shih, Kuei-ping
    Keywords: 多重頻道;媒體存取控制協定;管線;單一收發器;無線隨意網路;Multi-channel;MAC;pipeline;single transceiver;Ad hoc network
    Date: 2009
    Issue Date: 2010-01-11 06:08:29 (UTC+8)
    Abstract: 在IEEE 802.11 的規格書當中,雖然在PHY層提供了多個頻道供資料傳輸使用,然而在MAC層卻只針對了單一頻道提出了媒體存取控制協定。由於使用多重頻道進行傳輸,可帶來比單一頻道較好的網路效能是有目共睹的。因此,本論文考量在IEEE 802.11 無線隨意網路中,針對多重頻道提出一簡單並有效率的多重頻道無線隨意網路媒體存取控制協定。此協定的目的在於有效的安排每一筆資料的傳送,使其能夠在適當的時間點與適當的頻道上進行資料傳送,並達到避免資料碰撞的目的進而提升整體的網路效能。基於此目的,本論文將會探討在多重頻道無線隨意網路環境中,將必須克服的種種問題,如隱藏節點問題、接收端節點消失問題與頻道使用率…等等。然而,基於硬體成本上的考量,無線網路通訊設備通常只配備了一個收發器。而若傳輸節點只配備單一收發器時,隱藏節點問題將以另一型態存在於多重頻道的無線隨意網路環境當中。因此本論文將針對在多重頻道無線隨意網路環境中,分析隱藏節點問題的存在型態。並將管線化處理的概念,帶入了多重頻道無線網路的資料傳輸當中,提出一類似管線化處理傳輸機制的多重頻道媒體存取控制協定 (π-Mc),以避免因單一收發器而造成的多重頻道無線隨意網路下之隱藏節點問題。此外,本論文對頻道使用率亦有所琢磨,針對傳輸機制提出改善並有效地提升頻道使用率,進而將無線網路存取媒介資源的使用達到最佳化。由模擬實驗的結果可得知,本論文以管線概念所提出之 π-Mc多重頻道媒體存取控制協定,與IEEE 802.11 DCF機制相較之下,在網路傳輸效能的表現上將會隨著可以用頻道數的增加而有著顯著的改善。
    Due to the consideration of hardware cost, the wireless adapter is only with single transceiver. However, if only single transceiver is available in the multichannel network, the hidden terminal problem will happen in the different way, and name as multichannel hidden terminal problem. Therefore, the paper analyzes this problem and proposes a pipeline-like multichannel MAC protocol (π-Mc) to avoid the multichannel hidden terminal problem. In addition, the paper also tries to increase the usage of the channel. Finally, π-Mc also compares with IEEE DCF and DCA. According to the simulation results, π-Mc can perform well in the network throughput and delay.
    Appears in Collections:[Graduate Institute & Department of Computer Science and Information Engineering] Thesis

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