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題名 | A New Scheduling MAC Mechanism for AODV Protocol=結合新排程媒介存取控制機制之AODV協定 |
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作者 | 周碩聰; 彭賓鈺; 姜子龍; | 書刊名 | 康大學報 |
卷期 | 8 2018.06[民107.06] |
頁次 | 頁61-80 |
分類號 | 448.6 |
關鍵詞 | 競爭視窗; 接收端壅塞; 內部資料流競爭; 鏈結失敗率; 發送端訊框成本; 目的端訊框成本; Contention window; Receiver blocking; Intra-flow contention; Link failure probability; Frame cost of source; Frame cost of destination; |
語文 | 英文(English) |
中文摘要 | 在隨意式無線網路(Ad Hoc Network)中,各結點與相鄰的結點共用同一個無線通道,由於結點間互相競爭(Contention)使用同一無線資源,將因無線頻道壅塞而產生資料訊框(Data Frame)的碰撞(Collision),導致隨意式無線網路效能低落。有鑑於此,許多的文獻皆説明:傳統的IEEE 802.11媒介存取控制採用競争模式,無法減少資料訊框的碰撞、舒緩無線通道壅塞,使得隨意式無線網路的整體效能無法有效地提升。本論文將以網路層AODV協定及資料鏈結層IEEE 802.11協定作為研究標的,根據隨意式無線網路的主動式路由及多點跳躍特性,提出一種新的媒體層(Medium Access Control, MAC)排序演算法;將上層AODV路由協定之資料傳輸路徑總長及距離目的地節點剩餘跳躍數當作耦合參數,傳遞給下層IEEE 802.11協定,做為後續各結點競爭視窗(Contention Window)大小的計算依據。此一架構將改善上層AODV協定的網路傳輸效能,達到較高的資料封包傳輸率(Throughput)、較好的資料封包成功送達率(Packet Delivery Ratio)、較小且穩定的資料封包路由成本(Routing Load)及較低的鏈路失敗機率(Link-failure Probability)。最後,我們將經由電腦模擬來驗證本論文所提策略之正確性與優越性。 |
英文摘要 | In a multi-hop ad hoc network, nodes contend for shared wireless channel with neighbors. The contention results in congestion and greatly degrades the performance of a network due to severe packet collisions. Several recent studies have shown that the performance of multi-hop ad hoc network is poor and the IEEE 802.11 scheme fails to achieve optimum scheduling for medium access contention. The present study demonstrtates a multi-hop packet scheduling framework to achieve high throughput, good packet delivery ratio, low routing load, and small link-failure probability in ad hoc environments. The routing information about the total hop count and the remaining hop count, required by a packet to reach its destination, is exploited by this scheme in the MAC layer to recalculate the contention window size of the nodes along routing path and to give priorities for the packets that are closer to their destination. Extensive simulations show that the proposed scheme is able to earn significant improvement over the conventional algorithm. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。