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研究生:陳威名
研究生(外文):WEI-MING CHEN
論文名稱:效能分析整合WLAN及GPRS之行動管理閘道器
論文名稱(外文):Performance Analysis of a Mobility Gateway for GPRS-WLAN Integration
指導教授:陳志成陳志成引用關係
指導教授(外文):Jyh-Cheng Chen
學位類別:碩士
校院名稱:國立清華大學
系所名稱:資訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:英文
論文頁數:56
中文關鍵詞:效能分析閘道器漫遊延遲時間緩衝區大小
外文關鍵詞:performance analysisgatewayhandoff latencybuffer size
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無線通訊網路與手機網路這近年來熱門研究,在目前市場上屬較成熟的無線通訊網路技術當推2.5G的GPRS與無線區域網路,為了要讓此兩不同系統網路能相互運作,提出一個能在兩系統中漫遊整合方法,儘可能減低對現有系統的影響,且針對此方法做效能上的研究與探討。
利用閘道器的方法來解決在兩系統中行動管理上的問題,此閘道器置於GPRS與無線網路的連接點上,且遵循IETF制定的Mobile IP來提供行動管理的功能。本論文是針對此閘道器做效能上的分析,分別對訊號和資料庫成本(Signaling and Database Cost)、漫遊延遲時間(Handoff Latency)、閘道器上緩衝區大小(Buffer Size)各提出一套數學模組來代表這三方面效能分析。在訊號和資料庫成本(Signaling and Database Cost)方面,提出一個簡單且快速數學模組來代表每個使用者在GPRS和WLAN系統中所花費的訊號與資料庫成本。由於本方法是整合兩套系統,漫遊延遲時間對業者或使用者是相當關心的,利用排對理論,提出一個可模組送出Mobile IP註冊訊息到收到註冊成功訊息的過程,此模組是使用MMPP(Markov-Modulated Poisson Process)當作使用者資料量(Traffic),每個使用者都以MMPP方式去傳送資料,每個系統結點(system node)都模組成MMPP/M/1,利用此方法能算出漫遊延遲時間在此兩系統中。最後一部分是分析如何設定閘道器上緩衝區大小,多個使用者的資料量和緩衝區大小表現在所提出的模組中,依據阻礙機率(Blocking Probability)來判斷緩衝區的狀態,且針對阻礙機率來設定出正確的緩衝區大小。此閘道器的方法已經在台灣大哥大和工研院實作出來,本論文提出的模組可供他們對閘道器效能更深入的了解,透過完整模擬的結果,可驗證本論文提出的分析模組。
This paper presents the design and analysis of GPRS-WLAN Mobility Gateway (GWMG) for the integration of GPRS and wireless LANs (WLANs). The proposed architecture leverages
Mobile IP as the mobility management protocol over WLANs. The interworking between GPRS and WLANs is achieved by the GWMG which resides on the border of GPRS and WLAN systems. The design goal is to minimize the modications in GPRS and WLANs as that both systems are widely available in the market already. By deploying the GWMG, users can seamlessly roam among two systems. Both mathematical analysis and simulation are developed to analyze the performance. The analysis models include the cost, handoff latency, and buffer size. The proposed GWMG has also been implemented in a commercial GPRS system. The results show that the GWMG could achieve the design goal to effectively integrate GPRS and WLANs.
1. Introduction 1
1.1. Overview 1
1.2. Mobility Management 4
1.2.1. Mobility Management in GPRS 4
1.2.2. Mobility Management in WLAN 4
1.3. Organization of the Thesis 6

2. The Mobility Gateway for GPRS-WLAN Integration 7
2.1. Design of GPRS-WLAN Mobility Gateway (GWMG) 7
2.1.1. Home in WLAN System 9
2.1.2. Home in GPRS Network 13
2.2. Handoff Management 17
2.3. System Requirements 18
2.3.1. Requirements for GPRS and WLAN Systems 18
2.3.2. Requirements for MS 18

3. The Analysis of Cost 20
3.1. Signaling and Database Cost 20
3.2. Numerical Results 23
3.3. Summary 24

4. The Analysis of Handoff Latency 25
4.1. Handoff Latency 25
4.1.1. Related Works 25
4.1.2. Analysis 28
4.2. Numberical Results 36
4.3. Summary 40

5. Analysis of Buffer Size on GPRS-WLAN Mobility Gateway(GWMG) 41
5.1. Related Works 42
5.1.1. Blocking Probability 42
5.2. Analysis for Buffer Size 44
5.3. Numberical Results 47
5.4. Summary 51

6. Conclusion 53
Bibliography 54
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