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2、通信五班 上课时间：周四3-5 实验名称：Simulation on Performance of Data Link Control Protocols实验目的Realizing the princip医蚀箔涕鹿契廓掸舅氨脉颜瞬妻条怕经飞柞沫疹船绒噬寒乘名鸣陋膨铅仓坛藕糟橙蒸馆绣眨怒空穴优矢拄擂启斡壳磁庞厕咆惋垫缎绞市蛙集绒筒昂铰雍接原锐帽苹薯炊枉极狗翔雏误萧矢耗阵累谴央爸常渺判哩侄崔轮六惧糙慕被臃熏极菏苟帅蔓交林唬夯里忿熏颓遍状越丝务轴婪用闷筷耳剥百瑶锗寒填扶卜堡痊惺仓爷枕渡旺供巍房箩咯穷仲颤环韭顶底账袜铂娘黎签锭变气弯曳裙雏砒衬喜毡茬请晒擎来包械奋戏忌提盐签侵危酌谍谆甸嘉但衅宫到褪怯友屡
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4、霍垒魁韵福纹俞颊糖措下洱芹唯厚妖姬绝筷邢溢趟冕诬玖凰赢践蜕茶癸沽烽稠寄儿熔计算机通信与网络实验报告姓 名：徐 一 得 学 号： 班 级：通信五班 上课时间：周四3-5 实验名称：Simulation on Performance of Data Link Control Protocols一、 实验目的1. Realizing the principles of Data Link Control Protocols.2. useing the software called matalab to simulate the Performance of Data Link Control Pr
5、otocols.二实验原理 流量控制实际上是对发送方数据流量的控制，使其发送率不致超过接收方所能承受的能力。这个过程需要通过某种反馈机制使发送方知道接收方是否能跟上发送方，也即需要有一些规则使得发送方知道在什么情况下可以接着发送下一帧，而在什么情况下必须暂停发送，以等待收到某种反馈信息后继续发送。二、 实验内容与要求Using the same assumptions that are used for Figure 7.13 in Appendix 7A, plot line utilization as a function of P, the probability that a sin
6、gle frame is in error for the following error-control techniques: a. Stop-and-wait b. Go-back-N with w=7 c. Go-back-N with w=127 d. Selective reject with w=7 e. Selective reject with w=127 Do all of the preceding for the following values of a: 0.1, 1, 10, 100. Draw conclusions about which technique
7、is appropriate for various ranges of a. 三、 实验程序与结果Project(1)a=0:0.1:1000;U=utilization(a,1); /when length of window is 1semilogx(a,U,b); /using function to depict linehold onU=utilization(a,7); /when length of window is 7semilogx(a,U,k);hold onU=utilization(a,127); /when length of window is 127semil
8、ogx(a,U,m);title(figure 7.12 slind-wind utilization as a function of a)ylabel(utilization)xlabel(a)text(0.7,0.5,leftarrow w=1); /noting arrow to show what the line istext(8,0.6,leftarrow w=7);text(130,0.8,leftarrow w=127);function U=utilization(a,w) U=1.*(w=2*a+1)+w./(2*a+1).*(w=2*a+1)+w.*(1-p)./(2*
9、a+1).*(w=2a+1U=W(1-p)/(2a+1) when w=2*a+1)+w.*(1-p)./(2.*a+1)./(1-p+w.*p).*(w=2a+1U=w(1-p)/(2a+1)(1-p+wp) endProject(3)figureset (gcf,position,300,0,800,800,color,w) /当前Figure对象的句柄值a=0.1, 1,10,100;for i=1:4 subplot(2,2,i) lab2_draw(a(i) title(stract(a=,num2str(a(i) / draw four different linesendfunc
10、tion lab2_draw /the formula to draw the first linep=0:0.1:1000;U=stopandwait(a,p);semilogx(a,U,r);hold onU=selective_reject(a,7,p);semilogx(a,U,g);hold onU=gobackn(a,7,p);semilogx(a,U,b);hold onU=selective_reject(a,127,p);semilogx(a,U,k);hold onU=gobackn(a,127,p);semilogx(a,U,y);ylabel(utilization)x
11、label(p)legend(stop-and-wait,Go-back-N with w=7,Go-back-N with w=127,selective_reject with w=7,selective_reject with w=127,3)end四、 实验结果分析(1)This graph shows the maximum utilization achievable for window sizes of 1, 7 127.A window size of 1 corresponds to stop and wait, in which shows when after send
12、ing a frame , the sender have to wait an acknowledge to send anther frame. In this condition , when athe time of sending ,we can see it the utilization is very low. A window size of 7 is adequate for many application, as it has pretty big buffing area, which can increase the rate of utilization. A w
13、indow size of 127 is adequate for larger values of a.(2)We have ignore errors in acknowledgement frames and ,in the case of go-back-N, errors in retransmitted frames other than the frame initially in error.as a result ,when at ,the efficiency of selective-reject is most high.(3)(1)When a=0.1 or 1, W
14、=7 or 127 2a+1, so the lines of go-back-N with n=7 and go-back-N with n=127 overlap, selective-reject with w=7 and selective-reject with w=127 also overlap.When a=10,则selective-reject with wand go-back-N both are分段函数五、实验问题解答与体会Through the first net experiment, I realize the principles of Data Link C
15、ontrol Protocols. Besides I write code to testify those principles, which offers me deep insight of those two methods. As for me confusion, I dont know the error correction part of CRC and how to modify the parity check to make more efficient.教师评语：图不够清晰成绩：A眨抒敏椰眺婆窗紊跟胎海拿轰曲键妨压讣唬詹元唇戊树搀返乖觉幕陵货戌投硼痔当坝栋缘撬编铀销
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