TCP拥塞控制毕业论文

武汉科技大学本科毕业论文I摘要TCP的拥塞控制由“慢启动(Slowstart)”和“拥塞避免(Congestionavoidance)”组成，后来TCPReno版本中又针对性的加入了“快速重传(Fastretransmit)”、“快速恢复(FastRecovery)”算法，再后来在TCPNewReno中又对“快速恢复”算法进行了改进，近些年又出现了选择性应答(SACK)算法，还有其他方面的大大小小的改进，成为网络研究的一个热点。TCP的拥塞控制主要原理依赖于一个拥塞窗口(cwnd)来控制，窗口值的大小就代表能够发送出去的但还没有收到ACK的最大数据报文段，显然窗口越大那么数据发送的速度也就越快，但是也就越可能使得网络出现拥塞，如果窗口值为1，那么就简化为一个停等协议，每发送一个数据，都要等到对方的确认才能发送第二个数据包，显然数据传输效率低下。TCP拥塞控制算法就是要在这两者之间权衡，选取最好的cwnd值，从而使得网络吞吐量最大化且不产生拥塞。[1]计算机网络已经逐渐发展成为现代生活中必不可少的一个部分，本论文的主要研究目的就是针对计算机网络中的TCP协议中的Reno拥塞控制，对其实行可视化，使其变得更加容易理解，让我们对计算机网络有更深刻的认识。关键词：慢启动；拥塞避免；快速重传；快速恢复；可视化武汉科技大学本科毕业论文IIAbstractTCPcongestioncontrolfromSlowstartandCongestionavoidancecomposedofTCPRenoversionslaterthentargetedtojointheFastretransmit,FastRecoveryalgorithm,andthenlateragainintheTCPNewRenointhefastrecoveryalgorithmhasbeenimprovedinrecentyearshasemergedselectiveacknowledgementalgorithm,aswellasotherlargeandsmallimprovementsbecomearesearchhotspotnetwork.ThemainprincipleofTCPcongestioncontrolreliesonacongestionwindow(cwnd)tocontrolthewindowsizevaluerepresentstheabilitytosendoutbutnotyetreceivedthemaximumdatapacketACKDuan,clearwindow,sothegreaterthespeedofdatasentthefaster,butalsomorelikelytomakethenetworkcongestionoccurs,ifthewindowis1,thenreducedtoastopsuchagreement,eachsendingadata,mustwaitforconfirmationoftheotherpartycansendasecondpacket,thedataclearlytransmissionefficiencyislow.TCPcongestioncontrolalgorithmistobalancebetweenthesetwo,choosethebestcwndvalue,allowingthenetworktomaximizethroughputanddoesnotcreatecongestion.Computernetworkhasgraduallybecomeanessentialofmodernlife,apartofthemainresearchobjectiveofthisthesisisacomputernetworkfortheTCPRenocongestioncontrolprotocolinitsimplementationofvisualizationtomakeitmoreeasytounderstand,letthecomputernetworkhasabetterunderstanding.Keywords:Slowstart;Congestionavoidance;Fastretransmit;FastRecovery;Visualization武汉科技大学本科毕业论文III目录1绪论..........................................................................................................................11.1课题背景及意义...................................................................................11.2课题现状...............................................................................................11.3本文的主要研究内容...........................................................................22开发平台与技术的选择及介绍..............................................................................32.1开发环境的介绍...................................................................................32.1.1硬件环境.....................................................................................32.1.2软件环境....................................................................................32.2Reno拥塞控制简介.............................................................................32.3开发平台简介.......................................................................................33需求分析及可行性研究..........................................................................................53.1需求分析...............................................................................................53.1.1时间要求....................................................................................53.1.2功能要求....................................................................................53.1.3Reno拥塞控制的四个阶段......................................................53.1.4性能要求....................................................................................83.2可行性研究...........................................................................................93.2.1成本可行性分析........................................................................93.2.2技术可行性分析........................................................................94相关开发技术的原理性说明................................................................................104.1VisualStuidio2008相关简介..............................................................104.2TCP/IP协议和拥塞控制简介............................................................114.3C#简介及特点....................................................................................134.3.1C#简介.....................................................................................134.3.2C#与C++、JAVA的区别........................................................134.3.3C#的前途....................................................................................145系统功能模块分析...................................................................................................155.1主框架具体功能....................................................................................155.2各功能模块详细设计............................................................................156详细设计及编码实现...............................................................................................176.1主框架详细设计.................................................................................176.2模块的详细设计....................................................................................17武汉科技大学本科毕业论文IV6.2.1程序代码..................................................................................176.2.2