樹狀結構為基礎之行動隨意網路IP位址分配機制

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姓名

吳文志(Wen-zhi Wu) 查詢紙本館藏

畢業系所

資訊管理學系

論文名稱

樹狀結構為基礎之行動隨意網路IP位址分配機制
(A tree-based IP assignment scheme in mobile ad hoc network)

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摘要(中)

行動隨意網路為一個多點跳躍的網路，因此裝置間需要時常通訊。在有線網路中裝置可透過DHCP自動取得獨一無二的IP位址，然而行動隨意網路是臨時且隨意形成，因此IP位址分配工作無法由特定單一裝置負責。有鑑於此，本研究設計出一套適用於行動隨意網路中的IP位址分配機制，使所有節點進入網路後均可獲得一個獨一無二的IP位址。
目前行動隨意網路上IP位址分配機制可分為兩類：氾濫式與位址池，本論文以位址池方式為主。在本論文中，只有部份節點可分配IP位址(稱之為分配者)，而無法分配IP位址之節點，彼此間可透過週期性廣播得知目前最近分配者資訊，因此當新節點進入網路後便可使用較少的頻寬資源且不必浪費過多的時間來取得IP位址。
行動隨意網路之拓撲是持續變動，使得網路分離與合併的情況時常出現，因而發生IP位址遺失與衝突，本研究也針對網路分離與合併設計出一套偵測方式，並且解決節點IP位址遺失與衝突情況的發生。在進行網路與合併分離時需要確認目前網路IP位址使用狀況，以往的研究是節點逐一回報IP位址資訊給合併/分離者，本機制利用氾濫訊息建立位址回報樹，因此可減少節點回報IP位址資訊所造成之流量。
本研究透過ns2模擬証明所提出機制之可行性，並且分析不同參數設定值對機制效能所造成之影響，進而從中歸納機制之優缺點與可能改進之處，作為未來改進方向。

摘要(英)

Mobile Ad-hoc Network (MANET) is a multi-hop network for which the communication between mobile nodes is persistent. The IP addresses can be assigned automatically by DHCP server in the wired network. However, it cannot be applied to MANET because of its distributed and dynamic nature. In this paper, we propose a tree-based IP assignment scheme which assigns a unique IP address for each node in MANET.
There are two ways of IP assignment scheme for MANET, flooding based and address-pool based. The presented scheme is based on an address-pool way in which only some of the nodes are assigned as allocators which are responsible for assigning an IP address to a new node in the network. Mobile nodes exchange hello messages to find the closest allocators, hence new incoming node can occupy less bandwidth resource to obtain an IP address quickly.
Because of the rapid change and unpredictability of MANET topology, networks merging and partitioning are occurred frequently. The IP addresses of the nodes may be lost or collide when networks merge or partition. We design methods for detecting and solving such problems. In previous IP assignment schemes, nodes report their IP addresses information to the node which detects networks merging and partitioning through unicast. In our scheme, we design an address-reported-tree in order to reduce the communication overhead occurred by all nodes reporting their IP address at the same time.
In this paper, we use ns-2 simulators to evaluate our scheme by modifying various parameters. According to the simulation results, the advantages and disadvantages of our scheme are discussed, and the future works of our scheme is figured out.

關鍵字(中)

★ 位址分配
★ 行動隨意網路

關鍵字(英)

★ ip assignment
★ mobile ad hoc network

論文目次

第一章緒論 1
1.1 研究背景 1
1.2 研究動機與目的 5
1.3 論文架構 7
第二章背景介紹 8
2.1 行動網路分離與合併 8
2.2 氾濫式(flooding-based)為基礎之IP位址分配機制 10
2.3 位址池(address pool)為主之IP位址分配機制 14
第三章 IP分享機制 20
3.1 封包格式 20
3.2 名詞介紹 23
3.2.1 IP區塊模型 23
3.2.2 網路識別碼 24
3.2.3 角色任務介紹 25
3.2.4 IP區塊的管理 25
3.2.5 位址分配樹 27
3.3 機制介紹 32
3.3.1 機制簡介 32
3.3.2 節點進入 35
3.3.3 節點離開 38
3.3.4 網路分離(Network split) 39
3.3.5 網路合併(Network merge) 42
3.4 機制之強化 44
3.4.1 位址回報樹 44
3.4.2 廣播延遲時間設計 45
第四章模擬數據與效能評估 47
4.1 模擬環境 47
4.2 效能評估指標 47
4.3 廣播延遲係數(α)分析 48
4.4 位址池大小與跳躍數分析 51
4.5 節點速度之分析 54
4.6 節點密度之分析 56
第五章結論 59
5.1 機制特色 59
5.2 論文貢獻 60
5.3 未來研究方向 61

參考文獻

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指導教授

蘇坤良(Kuen-Liang Sue)

審核日期

2007-4-19

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