计算机与通信网络实验报告.docx
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计算机与通信网络实验报告.docx
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计算机与通信网络实验报告
0戴妍
实验一 隐终端和暴露终端问题分析
一、实验设定:
基本参数配置:
仿真时长100s;随机数种子1;仿真区域2000x2000;节点数4。
节点位置配置:
本实验用[1] 、[2]、 [3] 、[4]共两对节点验证隐终端问题。
节点[1]、[2]距离为200m,节点[3]、[4]距离为200m,节点[2]、[3]距离为370m。
业务流配置:
业务类型为恒定比特流CBR。
[1]给[2]发,发包间隔为,发包大小为512bytes;[3]给[4]发,发包间隔为,发包大小为512bytes。
二、实验结果:
Node:
1,Layer:
AppCbrClient,(0)Serveraddress:
2
Node:
1,Layer:
AppCbrClient,(0)Firstpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,(0)Lastpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,(0)Sessionstatus:
Notclosed
Node:
1,Layer:
AppCbrClient,(0)Totalnumberofbytessent:
5120000
Node:
1,Layer:
AppCbrClient,(0)Totalnumberofpacketssent:
10000
Node:
1,Layer:
AppCbrClient,(0)Throughput(bitspersecond):
409600
Node:
2,Layer:
AppCbrServer,(0)Clientaddress:
1
Node:
2,Layer:
AppCbrServer,(0)Firstpacketreceivedat[s]:
Node:
2,Layer:
AppCbrServer,(0)Lastpacketreceivedat[s]:
Node:
2,Layer:
AppCbrServer,(0)Averageend-to-enddelay[s]:
Node:
2,Layer:
AppCbrServer,(0)Sessionstatus:
Notclosed
Node:
2,Layer:
AppCbrServer,(0)Totalnumberofbytesreceived:
4975616
Node:
2,Layer:
AppCbrServer,(0)Totalnumberofpacketsreceived:
9718
Node:
2,Layer:
AppCbrServer,(0)Throughput(bitspersecond):
398078
Node:
3,Layer:
AppCbrClient,(0)Serveraddress:
4
Node:
3,Layer:
AppCbrClient,(0)Firstpacketsentat[s]:
Node:
3,Layer:
AppCbrClient,(0)Lastpacketsentat[s]:
Node:
3,Layer:
AppCbrClient,(0)Sessionstatus:
Notclosed
Node:
3,Layer:
AppCbrClient,(0)Totalnumberofbytessent:
5120000
Node:
3,Layer:
AppCbrClient,(0)Totalnumberofpacketssent:
10000
Node:
3,Layer:
AppCbrClient,(0)Throughput(bitspersecond):
409600
Node:
4,Layer:
AppCbrServer,(0)Clientaddress:
3
Node:
4,Layer:
AppCbrServer,(0)Firstpacketreceivedat[s]:
Node:
4,Layer:
AppCbrServer,(0)Lastpacketreceivedat[s]:
Node:
4,Layer:
AppCbrServer,(0)Averageend-to-enddelay[s]:
Node:
4,Layer:
AppCbrServer,(0)Sessionstatus:
Notclosed
Node:
4,Layer:
AppCbrServer,(0)Totalnumberofbytesreceived:
5120000
Node:
4,Layer:
AppCbrServer,(0)Totalnumberofpacketsreceived:
10000
Node:
4,Layer:
AppCbrServer,(0)Throughput(bitspersecond):
409612
通过仿真结果可以看出,节点[2]无法收到数据。
由于节点[3]是节点[1]的一个隐终端,节点[1]无法通过物理载波检测侦听到节点[3]的发送,且节点[3]在节点[2]的传输范围外,节点[3]无法通过虚拟载波检测延迟发送,所以在节点[1]传输数据的过程中,节点[3]完成退避发送时将引起冲突。
三、课后思考
1、RTS/CTS能完全解决隐终端问题吗如果不能,请说明理由。
答:
能。
对于隐发送终端问题,[2]和[3]使用控制报文进行握手(RTS-CTS),听到回应握手信号的[3]知道自己是隐终端,便能延迟发送;对于隐接受终端问题,在多信道的情况下,[3]给[4]回送CTS告诉[4]它是隐终端,现在不能发送报文,以避免[4]收不到[3]的应答而超时重发浪费带宽。
2、如何设计仿真场景来验证暴露终端问题
答:
只需更改业务流配置:
业务类型为恒定比特流CBR。
[2]给[1]发,发包间隔为,发包大小为512bytes;[3]给[4]发,发包间隔为,发包大小为512bytes。
观察在[2]给[1]发送数据的同时,[3]给[4] 发送数据会不会被影响。
3、如何设计协议使暴露终端场景下的流实现并发
答:
至少要使用两个信道资源,在数据信道上进行RTS-CTS握手,在数据信道上发送数据报文。
在[2]给[1]发送数据报文时,[3]也想向[4]发送数据报文,通过控制信道向[4]发送RTS,[4]也从控制信道向[3]回送CTS,这样[3]就不会因为[2]的数据信号和[4]的回应信号产生碰撞而听不到[4]的回应了。
这样就可以实现并发了。
实验二无线局域网DCF协议饱和吞吐量验证
1、实验设定
基本参数配置:
仿真时长100S随机数种子1仿真区域150x150节点数100。
业务流配置:
业务类型为CBR,发包大小为512bytes,发包间隔为,分别测出5、10、15、20、25、30、35、40、45、50条流的吞吐量。
二、实验结果:
5条:
Node:
1,Layer:
AppCbrClient,(4)Serveraddress:
55
Node:
1,Layer:
AppCbrClient,(4)Firstpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,(4)Lastpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,(4)Sessionstatus:
Notclosed
Node:
1,Layer:
AppCbrClient,(4)Totalnumberofbytessent:
5120000
Node:
1,Layer:
AppCbrClient,(4)Totalnumberofpacketssent:
10000
Node:
1,Layer:
AppCbrClient,(4)Throughput(bitspersecond):
409600
Node:
1,Layer:
AppCbrClient,(3)Serveraddress:
54
Node:
1,Layer:
AppCbrClient,(3)Firstpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,(3)Lastpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,(3)Sessionstatus:
Notclosed
Node:
1,Layer:
AppCbrClient,(3)Totalnumberofbytessent:
5120000
Node:
1,Layer:
AppCbrClient,(3)Totalnumberofpacketssent:
10000
Node:
1,Layer:
AppCbrClient,(3)Throughput(bitspersecond):
409600
Node:
1,Layer:
AppCbrClient,
(2)Serveraddress:
53
Node:
1,Layer:
AppCbrClient,
(2)Firstpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,
(2)Lastpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,
(2)Sessionstatus:
Notclosed
Node:
1,Layer:
AppCbrClient,
(2)Totalnumberofbytessent:
5120000
Node:
1,Layer:
AppCbrClient,
(2)Totalnumberofpacketssent:
10000
Node:
1,Layer:
AppCbrClient,
(2)Throughput(bitspersecond):
409600
Node:
1,Layer:
AppCbrClient,
(1)Serveraddress:
52
Node:
1,Layer:
AppCbrClient,
(1)Firstpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,
(1)Lastpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,
(1)Sessionstatus:
Notclosed
Node:
1,Layer:
AppCbrClient,
(1)Totalnumberofbytessent:
5120000
Node:
1,Layer:
AppCbrClient,
(1)Totalnumberofpacketssent:
10000
Node:
1,Layer:
AppCbrClient,
(1)Throughput(bitspersecond):
409600
Node:
1,Layer:
AppCbrClient,(0)Serveraddress:
51
Node:
1,Layer:
AppCbrClient,(0)Firstpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,(0)Lastpacketsentat[s]:
Node:
1,Layer:
AppCbrClient,(0)Sessionstatus:
Notclosed
Node:
1,Layer:
AppCbrClient,(0)Totalnumberofbytessent:
5120000
Node:
1,Layer:
AppCbrClient,(0)Totalnumberofpacketssent:
10000
Node:
1,Layer:
AppCbrClient,(0)Throughput(bitspersecond):
409600
Node:
51,Layer:
AppCbrServer,(0)Clientaddress:
1
Node:
51,Layer:
AppCbrServer,(0)Firstpacketreceivedat[s]:
Node:
51,Layer:
AppCbrServer,(0)Lastpacketreceivedat[s]:
Node:
51,Layer:
AppCbrServer,(0)Averageend-to-enddelay[s]:
Node:
51,Layer:
AppCbrServer,(0)Sessionstatus:
Notclosed
Node:
51,Layer:
AppCbrServer,(0)Totalnumberofbytesreceived:
5102592
Node:
51,Layer:
AppCbrServer,(0)Totalnumberofpacketsreceived:
9966
Node:
51,Layer:
AppCbrServer,(0)Throughput(bitspersecond):
408219
Node:
52,Layer:
AppCbrServer,
(1)Clientaddress:
1
Node:
52,Layer:
AppCbrServer,
(1)Firstpacketreceivedat[s]:
Node:
52,Layer:
AppCbrServer,
(1)Lastpacketreceivedat[s]:
Node:
52,Layer:
AppCbrServer,
(1)Averageend-to-enddelay[s]:
Node:
52,Layer:
AppCbrServer,
(1)Sessionstatus:
Notclosed
Node:
52,Layer:
AppCbrServer,
(1)Totalnumberofbytesreceived:
5102592
Node:
52,Layer:
AppCbrServer,
(1)Totalnumberofpacketsreceived:
9966
Node:
52,Layer:
AppCbrServer,
(1)Throughput(bitspersecond):
408233
Node:
53,Layer:
AppCbrServer,
(2)Clientaddress:
1
Node:
53,Layer:
AppCbrServer,
(2)Firstpacketreceivedat[s]:
Node:
53,Layer:
AppCbrServer,
(2)Lastpacketreceivedat[s]:
Node:
53,Layer:
AppCbrServer,
(2)Averageend-to-enddelay[s]:
Node:
53,Layer:
AppCbrServer,
(2)Sessionstatus:
Notclosed
Node:
53,Layer:
AppCbrServer,
(2)Totalnumberofbytesreceived:
3926016
Node:
53,Layer:
AppCbrServer,
(2)Totalnumberofpacketsreceived:
7668
Node:
53,Layer:
AppCbrServer,
(2)Throughput(bitspersecond):
314112
Node:
54,Layer:
AppCbrServer,(3)Clientaddress:
1
Node:
54,Layer:
AppCbrServer,(3)Firstpacketreceivedat[s]:
Node:
54,Layer:
AppCbrServer,(3)Lastpacketreceivedat[s]:
Node:
54,Layer:
AppCbrServer,(3)Averageend-to-enddelay[s]:
Node:
54,Layer:
AppCbrServer,(3)Sessionstatus:
Notclosed
Node:
54,Layer:
AppCbrServer,(3)Totalnumberofbytesreceived:
22016
Node:
54,Layer:
AppCbrServer,(3)Totalnumberofpacketsreceived:
43
Node:
54,Layer:
AppCbrServer,(3)Throughput(bitspersecond):
1761
Node:
55,Layer:
AppCbrServer,(4)Clientaddress:
1
Node:
55,Layer:
AppCbrServer,(4)Firstpacketreceivedat[s]:
Node:
55,Layer:
AppCbrServer,(4)Lastpacketreceivedat[s]:
Node:
55,Layer:
AppCbrServer,(4)Averageend-to-enddelay[s]:
Node:
55,Layer:
AppCbrServer,(4)Sessionstatus:
Notclosed
Node:
55,Layer:
AppCbrServer,(4)Totalnumberofbytesreceived:
22016
Node:
55,Layer:
AppCbrServer,(4)Totalnumberofpacketsreceived:
43
Node:
55,Layer:
AppCbrServer,(4)Throughput(bitspersecond):
1761
10、15、20、25、30、35、40、45、50条省略
各发送节点发包间隔较大,当网络中发送节点较少时,网络还未饱和。
逐渐往网络中增加负载,网络总吞吐量逐渐增大,之后,网络吞吐量逐渐趋向于平稳,此时,网络即达到了饱和状态。
三、课后思考
1、总结IEEE协议饱和吞吐量和哪些因素有关。
任选一个时隙,网络中有节点在发送数据的概率 当有节点在发送数据包时,数据包发送成功的概率 数据包发送成功和发送失败所需的时间
2、为什么在数据包长度较长时,采用RTS/CTS模式更合理
"隐藏终端"多发生在大型单元中(一般在室外环境),这将带来效率损失,并且需要错误恢复机制。
当需要传送大容量文件时,尤其需要杜绝"隐藏终端"现象的发生。
3、本实验中提出的马尔科夫链模型只适用于单跳模型,若应用到多跳网络
中时,需如何改进
于定长时隙的多跳adhoc网络DCF协议马尔可夫链模型
实验三 动态源路由协议路由选择验证
一、实验设定
基本参数配置:
仿真时长100S;随机数种子1;仿真区域2000x2000;节点数5。
节点位置配置:
用节点[1]-[5]来验证DSR路由协议的路由发现过程。
[1]和[2]、[2]和[3]、[3]和[4]、[3]和[5]、[4]和[6]、[5]和[6]之间距离为200m。
设置业务流:
[1]给[2]发,发包间隔,发包大小512Bytes。
设置节点移动性:
节点[1]为移动节点,仿真过程中绕网格拓扑转一圈。
二、 实验结果:
Time(s):
Node:
1,Routepath:
2
Time(s):
Node:
1,Routepath:
2
Time(s):
Node:
1,Routepath:
2
Time(s):
Node:
1,Routepath:
2
Time(s):
Node:
1,Routepath:
2
Time(s):
Node:
1,Routepath:
2
Time(s):
Node:
1,Routepath:
2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepath:
4-2
Time(s):
Node:
1,Routepat
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