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研究生(外文):Bing-Jung Hsieh
論文名稱(外文):Density-Aware Routing Scheme in Delay Tolerant Networks
指導教授(外文):Chih-Lin Hu
外文關鍵詞:Delay Tolerant NetworksRouring SchemeDensity-Aware
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Delay-tolerant networks emphasize high node mobility and connecting opportunity in wireless and mobile ad hoc network environments. Since network topologies in such environments are partitioned extremely, it is difficult to ensure the existence and reliability of end-to-end paths between any pair of source and destination nodes. Delay-tolerant data delivery mechanisms perform in a store-carry-and-forward routing manner where nodes repeatedly replicate messages and forward message copies to encountered nodes during their movements. In order to improve message delivery ratio and reduce transfer delay, conventional delay-tolerant routing mechanisms mainly apply replication-based or history-based routing protocols to increase the delivery ratio or decrease the transfer deal. However, routing based on message replication can induce extra message traffic and communication overhead; on the other hand, routing based on encountering history information can complicate the routing decision and cause database overhead. The study of this paper proposes a density-aware routing scheme in delay tolerant networks. Considering non-uniform node distributions, it has higher probability to encounter target nodes with lower delay time. This paper formulates the tendency of inter-meeting time between nodes to determine the node density in proximity and then keep message replicas in dense areas as more as possible. This design derives the linear and the tree-based models for density estimation in proximity. The density estimation takes into account the temporal weighting and spatial angle difference to improve the estimation accuracy. In addition, the density estimation depends on only the variance of inter-meeting time, so its scalability is irrelevant to node population in the network. Furthermore, this design generates only a small and constant number of message copies to avoid traffic congestion and resource waste. Finally, this study conducts extensive experiments to evaluate the performance sensitivities to the metrics of message delivery ratio and message transfer delay under a variety of simulation parameters. Consequently, the proposed density-aware scheme enables mobile nodes to estimate the local density and forward messages towards the dense areas, significantly increasing the delivery ratio in delay-tolerant networks.
摘要 i
目錄 iii
圖目錄 v
表目錄 vii
第一章簡介 1
第二章 相關文獻探討 7
2.1.1 Flooding based 7
2.1.2 Quota based 9
2.2 Impact of Mobility on Routing Protocol 11
2.3 Density Aware Applications 12
第三章 系統模型 15
3.1 DTN Networking Environment 15
3.2 System Model 17
3.3 符號表 20
第四章 Density Aware Routing Scheme 21
4.1 線狀記錄區域密度估測 22
4.2 樹狀記錄區域密度估測 25
4.3 即將前往區域之密度預測 29
4.4 Density Aware Routing Scheme(DARS) 30
4.5 分析節點移動速度的對IMT造成的影響並修正 33
第五章 模擬及數據分析 36
5.1 模擬效能指標 36
5.2 模擬環境及各項參數設定 36
5.3 模擬結果及數據分析 37
5.4 總結分析 54
第六章 結論與未來研究工作 56
參考文獻 57
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