隨意無線網路移動場景對繞徑與傳輸控制協定之效能分析與探討

Performance Analysis of MANETs Routing Protocols under TCP variants with Mobility Consideration

陳信宏(Hsin-Hung Chen)

指導教授 ： 陳永耀

國立臺灣大學/電機資訊學院/電機工程學研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.02562

摘要

隨意無線移動網路具有自我組織及設定特性的自治型動態網路，由具移動性的節點應用於無或缺乏基礎架構的環境下。由於隨意網路具有一些鮮明的特性，如動態的拓墣型態、非對稱式通訊連結特性、多跳躍式通訊、無基礎設施操作、頻寬限制以及電力限制等特點。在如此嚴苛條件下欲達成具效率的通訊架構，繞徑協定與傳輸控制協定，以及移動情境模式對無線移動網路傳輸效率之影響成為研究的重心。
本碩士論文以AODV 與DSDV 兩種不同類型的繞徑協定，並選擇Reno 與Vegas 傳輸控制協定，利用四種不同的節點移動速度，在繞徑、傳輸控制協定交叉設定下，企圖尋找出對傳輸效率具關鍵性的影響因子。由於相關研究確認RandomWaypoint 不足以完整確認隨意無線移動網路的效能，是以本論文除了在RandomWaypoint 上進行實驗外，更進一步於Manhattan Grid 與Reference Point Group Mobility 上，尋求在不同的移動情境模式下，該傳輸效率影響因子的異同。於本論文的分析結果，不僅令我們對於隨意無線移動網路的動態網路拓撲結構有更深刻的理解，更提供未來進行實際研究分析研究之基礎。本文中並以模擬數據來驗證分析結果的正確性。

關鍵字

隨意無線網路繞徑協定 ； 傳輸控制協定 ； 移動情境模式 ； NS-2

並列摘要

Mobile Ad Hoc Network (MANET) is a self-organizing, self-configuring, and dynamic topology autonomous networks of mobile nodes in an infrastructure-less environment. Due to ad hoc networks have several salient characteristics, for example, dynamic topologies, asymmetric link characteristics, multi-hop communication, decentralized operation, bandwidth-constrained variable-capacity links and energy constrained operation. In order to facilitate communication within MANET in efficiency way, a routing protocol is used to discover routes between the mobile nodes. In MANET, temporary link failures and route changes happen frequently. Assuming that all packet losses are due to congestion, Transport Control Protocol (TCP) performs poorly in such an environment. Many TCP variants have been developed for the improved performance of communication in MANET. Simulations were carried out using Network Simulator-2 (NS-2), the mobility scenario models are generated by BonnMotion, and the selected MANET Routing protocols. Ad hoc On-demand Distance vector (AODV) and Destination sequenced distance vector (DSDV) were analyzed in accordance with their best performance packet delivery rate, average end-to-end delay, and packet dropping, under TCP Vegas with mobility considerations.
The simulation results indicate that AODV has a better throughput performance and low average end-to-end delay compared with DSDV. With simulations of various ad
hoc network scenarios, it observes that when both TCP variants coexist in the same wireless ad hoc network, TCP Vegas generally dominates to obtain more throughput
than the competing TCP Reno.

並列關鍵字

MANETs ； AODV ； DSDV ； TCP ； Mobility model ； NS-2

參考文獻

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