| dc.contributor.advisor | 張宏慶 | zh_TW |
| dc.contributor.author (Authors) | 徐富寬 | zh_TW |
| dc.contributor.author (Authors) | Hsu ,Fu-Kuan | en_US |
| dc.creator (作者) | 徐富寬 | zh_TW |
| dc.creator (作者) | Hsu ,Fu-Kuan | en_US |
| dc.date (日期) | 2005 | en_US |
| dc.date.accessioned | 11-Sep-2009 16:05:05 (UTC+8) | - |
| dc.date.available | 11-Sep-2009 16:05:05 (UTC+8) | - |
| dc.date.issued (上傳時間) | 11-Sep-2009 16:05:05 (UTC+8) | - |
| dc.identifier (Other Identifiers) | G0927530301 | en_US |
| dc.identifier.uri (URI) | https://nccur.lib.nccu.edu.tw/handle/140.119/29700 | - |
| dc.description (描述) | 碩士 | zh_TW |
| dc.description (描述) | 國立政治大學 | zh_TW |
| dc.description (描述) | 資訊科學學系 | zh_TW |
| dc.description (描述) | 92753030 | zh_TW |
| dc.description (描述) | 94 | zh_TW |
| dc.description.abstract (摘要) | SCTP (Steam Control Transmission Protocol)是由IETF[2]提出在傳輸層的新機制。SCTP像TCP一樣提供擁塞控制機制(congestion control mechanism)。此外，SCTP提供Multi-Homing和Multi-Streaming兩個TCP所缺乏的重要機制。然而，SCTP和TCP一樣無法分辨當快速重傳機制(Fast-Rtx)或是Timeout機制啟動時，packet-loss發生的真正原因，如瞬間的通道錯誤或因網路擁塞引起的封包拋棄。於此，SCTP會不正確地啟動擁塞控制機制來防止網路擁塞狀況的持續惡化。 本篇論文目的在於改善SCTP在無線網路所遭遇效能低落的問題。我們提出三種解決問題的機制，分別是SCTP-EnhancedProbing、SCTP-Duplicate 及SCTP-Changeover。SCTP-EnhancedProbing機制是一種點對點的方法，用以判斷packet-loss發生的真正原因。SCTP-Duplicate機制則藉由multi-homing機制來幫助提升SCTP-EnhancedProbing機制的效能。SCTP-Changeover機制則是一個必要的方法來補足SCTP-Duplicate機制所引發的問題，以提供良好的改善方案。最後，我們將利用網路模擬器NS-2 (Network Simulator ver. 2)來驗證並評估我們所提出三種方法的效能。 | zh_TW |
| dc.description.abstract (摘要) | SCTP (Stream Control Transmission Protocol) is a new proposed mechanism by IETF [2] at the transport layer. SCTP has similar congestion control mechanism as that in TCP, and embeds multi-homing and multi-streaming mechanisms that are not offered by TCP. However, SCTP can’t identify exactly whether the cause of packet-loss is from transient channel error or congestion error as fast-transmission or timeout is triggered. SCTP will thus invoke congestion control mechanism incorrectly. The objective of the thesis is to improve the performance of SCTP which suffers performance degradation in a wireless network. We propose SCTP-EnhancedProbing, SCTP-Duplicate and SCTP-Changeover three mechanisms for this end. SCTP-EnhancedProbing is an end-to-end mechanism used to identify the cause of packet-loss. SCTP-Duplicate employs the multi-homing feature to enhance SCTP-EnhancedProbing performance. SCTP-Changeover is a necessary complement to SCTP-Duplicate mechanism. Moreover, the proposed SCTP-Changeover is an effective solution to the changeover problem in SCTP. At last, we verify and evaluate the performances of the three proposed mechanisms using Network Simulator 2 (NS-2), respectively. | en_US |
| dc.description.tableofcontents | Chapter 1 Introduction................................................................................................................1 1.1 Motivation.....................................................................................................................1 1.2 Contribution of the Research........................................................................................2 1.3 Thesis Organization......................................................................................................2 Chapter 2 Background and Related Works.................................................................................3 2.1 Overview of SCTP........................................................................................................3 2.1.1 Multi-homing.....................................................................................................4 2.1.2 Association Phases.............................................................................................6 2.1.3 Moible SCTP......................................................................................................8 2.1.3.1 M-SCTP IP Configuration......................................................................8 2.1.4 SCTP Protocol –Recommended Parameter Values.........................................10 2.1.5 Fault Management............................................................................................11 2.1.5.1 Endpoint Failure Detection...................................................................11 2.1.5.2 Path Failure Detection...........................................................................11 2.1.5.3 Failure Detection...................................................................................12 2.1.6 Congestion Control Mechanism in SCTP........................................................13 2.2 Related Work of SCTP-EnhancedProbing..................................................................15 2.2.1 Problems of TCP-Probing.. .............................................................................16 2.3 Related Work of SCTP-Duplicate...............................................................................17 2.4 Related Work of SCTP-Changeover...........................................................................19 2.4.1 Problems of Changeover in SCTP...................................................................19 2.4.2 Relative Researches on Changeover................................................................21 2.4.2.1 C-CACC Algorithm..............................................................................22 2.4.2.2 SFP-CACC Algorithm..........................................................................22 Chapter 3 Proposed Mechanisms..............................................................................................24 3.1 SCTP-EnhancedProbing Mechanism..........................................................................24 3.1.1 New Probing Chunk in SCTP..........................................................................24 3.1.2 Differences between TCP and SCTP...............................................................25 3.1.3 Action of SCTP-EnhancedProbing..................................................................25 3.1.4 Procedure of 2 Level Suspend Probing States.................................................27 3.1.5 The Congestion Control Mechanism of SCTP-EnhancedProbing...................28 3.2 SCTP-Duplicate Mechanism.......................................................................................29 3.3 SCTP-Changeover Mechanism...................................................................................30 3.3.1 Proposed Scheme.............................................................................................30 3.3.2 The Algorithm of Block Based SCTP-Changeover.........................................31 Chapter 4 Simulation and Evaluation.......................................................................................34 4.1 Simulation Tool and module.......................................................................................34 4.2 Simulation and Analysis.............................................................................................34 4.2.1 SCTP-EnhancedProbing Mechanism..............................................................34 4.2.1.1 Discussion.............................................................................................43 4.2.2 SCTP-Duplicate Mechanism...........................................................................44 4.2.3 SCTP-Changeover Mechanism........................................................................51 4.2.3.1 Evaluation.............................................................................................54 Chapter 5 Conclusion and Future Work...................................................................................59 5.1 Conclusion..................................................................................................................59 5.2 Future Work................................................................................................................59 Reference..................................................................................................................................61 | zh_TW |
| dc.language.iso | en_US | - |
| dc.source.uri (資料來源) | http://thesis.lib.nccu.edu.tw/record/#G0927530301 | en_US |
| dc.subject (關鍵詞) | SCTP | en_US |
| dc.subject (關鍵詞) | Changeover | en_US |
| dc.title (題名) | Improving SCTP End-to-End Performance in Wireless Network | zh_TW |
| dc.title (題名) | 改善SCTP協定於無線網路中點對點效能之研究 | zh_TW |
| dc.type (資料類型) | thesis | en |
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