4,014 research outputs found
Improve mobile IP handoff utilizing recorded neighbor information
No full text碩士近年來網際網路的普遍與無線概念興起，除了行動電話之外，人們也希望網際網路的使用可以無線化。在沒有網路線的地方上網，甚至是在移動的過程中上網。因此，IETF（Internet Engineering Task Force）在1996提出了一個繞徑通訊協定 Mobile IP，利用一個固定IP和一個暫時IP來達成無線節點（Mobile Node）在不同網域（domain）之間的移動。但這個方法有著先天的障礙，導致可移動無線設備（Mobile Node）在不同Agent間進行換手時，有大量封包遺失，無線設備因而失去連線。近年來各類的研究致力於減少封包遺失、減少換手（註冊）所需時間、和提出新的換手方式以期望達成無縫連接。這些方法雖然已經可以有效的改善Mobile IP，但都是以理想化的拓普為依據，但理想中的拓普並非總是存在於現實環境中。本論文同樣以改善換手延遲為目標，提出「在Agent中增加一個記錄鄰近Agent的功能」，以達成無縫連接。從評估中可發現，本方法表現與其他方法一樣的品質和效能，即使是在訊號較差的網路拓普中。The concepts of “wireless” and “mobility” were greatly emphasized in recent years. Users desired for using Internet wirelessly and during in motion, just as the use of mobile phone.
Therefore in 1996, IETF（Internet Engineering Task Force）proposed“Mobile IP”, a routing protocol. However, this scheme has congenital problem: When the mobile node hands off between different agents, plenty of packets might be lost, also, the mobile node might be disconnected.
For the solution to this problem, many recent studies has focused on reducing packet loss, minimizing handoff latency or register latency, as well as designing new handoff schemes to make seamless connection.
Although their findings can improve Mobile IP to a certain extent, those methods employed all rely on “ideal topology”, which can barely exist in reality.
This study aims to improve handoff latency, and proposes “adding the recording feature to every agent, so as the information of neighbor agent could be kept”, hence reaches the goal of “a seamless connection”.
According to the simulation result, our scheme can perform as satisfactory outcomes as other schemes, even in tougher topology.目 錄 V
圖 目 錄 VII
第一章 緒論 1
1.1 前言 1
1.2 章節架構 5
第二章 相關研究背景 6
2.1 背景知識 6
2.1.1 Mobile IP 名詞解釋 8
2.1.2 在Home Network 時註冊方式 10
2.1.3 在Foreign Network時註冊方式 14
2.1.4 封包路由方式 20
2.1.5 Mobile IP遭遇的問題 22
2.2 相關研究 23
2.2.1 提升註冊效率 23
2.2.2 封包暫存 26
2.2.3 連結層觸發與多網路介面 27
第三章 新移動IP換手機制（SANR）之架構 29
3.1 研究動機 29
3.2 研究構想 30
3.3 建立鄰居表 31
3.4 封包轉送 34
3.5 改進連結層換手 39
3.6 實例說明 41
第四章 效能評估 46
4.1 無縫傳輸 48
4.2 重疊區域調整 51
Mobile IP 51
4.4 頻寬消耗 65
4.5 類似Paper 67
第五章 結論 69
參考文獻 72
圖 目 錄
圖 1.1：理想環境 2
圖 1.2：艱難環境（1） 3
圖 1.3：艱難環境（2） 3
圖 2.1：無法路由之情況 7
圖 2.2：向HA註冊 10
圖 2.3：透過FA向HA註冊 16
圖 2.4：HMIP 拓普圖 23
圖 2.5：透過GFA向HA註冊 24
圖 2.6：利用GFA的區域註冊 25
圖 2.7：雙網卡工作示意圖 28
圖 3.1：建立Agent鄰居表 32
圖 3.2：建立N_table時的HA流程圖 33
圖 3.3：建立N_table時的FA流程圖 33
圖 3.4：封包轉送時的無線節點流程圖 34
圖 3.5：封包轉送時的oFA流程圖 35
圖 3.6：封包轉送時的HA流程圖 36
圖 3.7：封包轉送時的nFA流程圖 37
圖 3.8：利用N_record實現無縫傳輸 38
圖 3.9：在SANR中加入頻道資訊 40
圖 3.10：Mobile IP 環境拓普圖 41
圖 4.1：模擬環境 47
圖 4.2：Mobile IP方法中的UDP封包傳輸效能（1） 48
圖 4.3：Mobile IP方法中的UDP封包傳輸效能（2） 49
圖 4.4：SANR方法中的UDP封包傳輸效能 50
圖 4.5：Mobile IP在不同重疊區域之換手中斷 52
圖 4.6：SANR在不同重疊區域之換手中斷 55
圖 4.7：LLA-AP在不同重疊區域之換手中斷 58
圖 4.8：延遲一秒情況下SANR與LLA-AP在不同重疊區域之換手中斷 62
圖 4.9：頻寬消耗 66
圖 4.10：IPH方法中的UDP封包傳輸效能（1） 68
圖 4.11：IPH方法中的UDP封包傳輸效能（2） 68
表 目 錄
表 2.1：註冊請求訊息格式 11
表 2.2：註冊回覆訊息格式 11
表 4.1：Mobile IP在不同重疊區域之換手中斷 53
表 4.2：SANR在不同重疊區域之換手中斷 56
表 4.3：LLA-AP在不同重疊區域之換手中斷 59
表 4.4：延遲一秒情況中SANR在不同重疊區域之換手中斷 63
表 4.5：延遲一秒情況中LLA-AP在不同重疊區域之換手中斷 64學號: 694390120, 學年度: 9
IMS: The New Generation of Internet-Protocol-Based Multimedia Services
Get PDFLegacy networks, both fixed and mobile, which were originally designed for voice communications, are progressively migrating to new infrastructures that promise to revolutionize the services offered. In this paper, we will cover this new generation of personal communication services, with an emphasis on the family of Internet protocol (IP)-based multimedia subsystem (IMS)-aided infrastructure that relies on the session initiation protocol (SIP). As a benefit, the end users will enjoy a new generation of personal communications services that are accessible anywhere and anytime. These services are timedia subsystem (IMS)-aided infrastructure that relies on the directly related to the end users rather than to their diverse devices. It is anticipated that the new deployments of next-of the IMS technology. generation networks (all-IP based) will accelerate the adoptio
Perceptions of intellectual property: a review
Get PDFIn “The right to good ideas: patents and the poor”, The Economist depicts two driving forces in the contemporary discourse on IP and globalization. The one is interested in advancing the knowledge economy, an approach based on the belief that knowledge is the driving factor behind economic growth. The other resides on a belief that IP is a major means to advance the process of globalization. While the former is strongly motivated by new economic growth theory, as for example advanced by Stanford professor Paul Romer, the latter is based on typical anti-globalization arguments, such as for example the position that the IP system helps multinational companies to build up monopolies to the detriment of the poor, drives small and medium-sized enterprises (SMEs) and local business in developing countries out of business and increases prices for consumer products, be they pharmaceuticals or software. The purpose of this review is to help understand the current discourse on intellectual property, to grasp underlying themes, assumptions and connotations associated with the term “IP”, so as to identify paths leading to a more comprehensive understanding of IP and the opportunities and pitfalls it may provide
Discriminative, predictive, and evaluative properties of a trunk control measure in patients with stroke
No full textAgreement between the WHOQOL-BREF Taiwan Chinese and Taiwanese versions in elderly people
No full textTest-retest reproducibility and smallest real difference of 5 hand function tests in patients with stroke
No full text
Efficient Learning of Communication Profiles from IP Flow Records
No full textThe task of network traffic monitoring has evolved drastically with the ever-increasing amount of data flowing in large scale networks. The automated analysis of this tremendous source of information often comes with using simpler models on aggregated data (e.g. IP flow records) due to time and space constraints. A step towards utilizing IP flow records more effectively are stream learning techniques. We propose a method to collect a limited yet relevant amount of data in order to learn a class of complex models, finite state machines, in real-time. These machines are used as communication profiles to fingerprint, identify or classify hosts and services and offer high detection rates while requiring less training data and thus being faster to compute than simple models.Accepted author manuscriptCyber Securit
Psychometric Properties of Two Simplified 3-point Balance Scales in Patients with Stroke.
No full textInter-rater reliability and validity of the Action Research Arm test in stroke patients.
No full text- …
