臺灣博碩士論文加值系統

SCTP（Stream Control Transmission Protocol）是新一代的第四層網路傳輸協定，2000年由網路工程組織IETF（Internet Engineering Task Force）的信號傳輸工程組（SIGTRAN Working Group）所提出。提供連結導向（connection-oriented）及可靠性傳輸（reliable transport）的服務，新增multi-homing與multi-streaming的機制，改善傳統TCP在傳輸效率與安全性的缺陷，有效提升網路傳送的效能。
本論文將針對TCP（Transmission Control Protocol）的三種版本（Tahoe、NewReno、SACK）與SCTP（SCTP、NewReno），在擁塞控制方面作傳送效能比較。使用網路模擬軟體NS-2（Network Simulator-Version 2），分別模擬多種封包遺失時的封包接收數量與擁塞視窗（congestion window size）的變化情形，以及同時存在二種第四層傳輸協定時的封包接收數量、吞吐量（throughput）與遺失封包的分布情形。結果證實，SCTP在擁塞控制方面的設計確實優於TCP，尤其是面對多重封包遺失的情形，不但能有效降低封包遺失的機率，傳送效能也比TCP提升許多。

SCTP(Stream Control Transmission Protocol), a new fourth layer transport protocol, was proposed by the SIGTRAN Working Group of the IETF(Internet Engineering Task
Force). The protocol is a connection-oriented and reliable transport service. It also supports multi-homing and multi-streaming mechanisms and can improve the transmission efficiency and enhance the security of traditional TCP.
In this thesis we will focus on the congestion control for TCP (Transmission Control Protocol) (Tahoe, NewReno, SACK) and SCTP(SCTP, NewReno) and will compare the performance issue on delivery. We use the NS-2(Network Simulator-Version 2), a network simulation software, to simulate several scenarios of packet loss and congestion window size. The number of packets received, throughput and distribution of packet loss was simulated under two fourth layer transport protocol existing at the same time. The simulation results shows that the design of congestion control of SCTP is better than using TCP. The SCTP can not only reduce the probability of packet loss, but also improve the performance of delivery than TCP while face the suffering of multiple packet loss.

第一章　緒論
1.1 研究背景------------------------------------------1
1.2 動機與目的----------------------------------------1
1.3 論文架構------------------------------------------2
第二章 SCTP架構
2.1 SCTP簡介------------------------------------------3
2.2 SCTP主要特色與機制--------------------------------5
2.3 SCTP封包格式--------------------------------------8
2.3.1 Common Header-------------------------------8
2.3.2 Chunk--------------------------------------10
2.3.3 DATA Chunk---------------------------------12
2.3.4 INIT Chunk---------------------------------15
2.3.5 SACK Chunk---------------------------------17
2.4 SCTP、TCP與UDP之比較-----------------------------20
第三章 TCP與SCTP擁塞控制機制
3.1 基本的擁塞控制機制-------------------------------21
3.2 TCP Tahoe----------------------------------------22
3.3 TCP NewReno--------------------------------------23
3.4 TCP SACK-----------------------------------------25
3.5 SCTP---------------------------------------------26
3.6 SCTP NewReno-------------------------------------27
第四章 系統模擬
4.1 SCTP multi-homing--------------------------------29
4.2 one packet loss----------------------------------32
4.3 multiple packet loss-----------------------------34
4.4 效能比較-----------------------------------------37
第五章 結論
5.1 結論---------------------------------------------40
參考文獻-------------------------------------------------41

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[13] The Network Simulator ns-2 at
http://www.isi.edu/nsnam/ns/
[14] SCTP Module for ns-2 available at
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[15] The cygwin at
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