自適性傳輸範圍之行動隨意網路路由

行動隨意網路是由一群可互為通訊之無線行動設備動態所形成的無線網路架構。此網路中之無線行動設備通常具備有限的頻寬、高度的移動性、有限的電量及容易變化的網路拓樸等特性。因此，如何有效節省行動設備之電量及減少端對端之傳送延遲時間，以提供行動隨意網路良好的服務品質，是一項值得研討的議題。由於行動隨意網路具有拓樸變動及路由存活時間短等特性，使得於行動隨意網路上要提供良好傳送的品質較為不易。本論文提出一自適性傳輸範圍之行動隨意網路路由方法，此方法假設每個節點都具有一大一小之傳輸半徑，並可依傳遞的資訊特質訂定其優先權，具高優先權之資料，以大功率傳輸範圍作資料傳遞；反之，低優先權資料，則以小功率傳輸範圍作資料傳遞。以此可加速行動隨意網路之路由搜尋效能及減低封包傳遞所需之跳躍數，並且考量節點的剩餘電能，作為節點自我調節傳輸範圍的依據，以選擇較佳的路由及延長節點的存活時間。本文以定義之封包的傳達率、節點的存活率、端對端延遲時間及節點的跳躍數作為效能的評量標準，並以NS2為模擬平台建置一模擬系統，來評量、分析及比較動態來源路由、改良式動態來源路由及自適性傳輸範圍路由等三者的效能。

關鍵字

行動隨意網路；服務品質；自適性傳輸範圍路由

並列摘要

Mobile ad-hoc network (MANET) is a kind of wireless network. MANET is dynamically constructed with a group of mobile hosts within the range of wireless transmission. The characteristics of mobile devices in a MANET include the high mobility, limited bandwidth and limited power energy. To guarantee the QoS of a routing in MANET, we proposed an adaptive mechanism that nodes can adjust its radio power to forward packets base on certain conditions. That is, every node has a large and a small transmission range. Such an adaptive policy could save power energy, the node’s lifetime, and reduce the propagation delay time. However the proposed routing protocol could search an adequate path for forwarding packets, but it needs not to maintain the information of whole MANET. The data to be forwarded are classified into high priority mode and low priority mode. High priority data is transmitted by a large radio power, and low priority data is sent by a small radio power. The other condition to adapt the adjust transmission range is according to the residual power energy of nodes. We use NS2 to measure the data deliver ratio, end-to-end time delay, node live ratio and the node’s hop counts. A simulation system is built to measure, analysis and compare the routing efficiency between DSR, MDSR and ADSR.

並列關鍵字

mobile ad-hoc network ； QoS ； adaptive transmission range route

參考文獻

[1] R. Ramanathan and J. Redi, “A Brief Overview of Ad Hoc Networks: Challenges and Directions,” IEEE Commun. Mag., vol. 40, no. 5, pp. 20-22, May 2002.

[2] David B. Johnson, David A Maltz, and Yin-Chun Hu, “The Dynamic Source Routing Protocol for Mobile Ad Hoc Network,” IETF Internet draft 10, July 2004.

[3] Nguon Taing, et al., “Performance Improvement of Dynamic Source Routing Protocol for Multimedia Services in Mobile Ad Hoc Network,” in Proceding the 2006 Wireless and Optical Commun-cations Networks, IFIP, pp. 1-5, April 2006.

[6] Elizabeth M. Royer, Santa Barbara, and Chai-Hai-Keong Toh, “A Review of Current Routing Protocols for Ad Hoc Mobile Wireless Networks,” IEEE Personal Communications, pp. 46-55, April 1999.

[7] M. R. Pearlman, Z. J. Haas, and S. I. Mir, “Using Routing Zones to Support Route Maintenance in Ad Hoc Networks,” in Proceeding of IEEE Wireless Communications and Networking, vol. 3, pp. 1280-1285, 2000.

國際替代計量

自適性傳輸範圍之行動隨意網路路由

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