计网实验datalinklayersimulationWord文件下载.docx
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计网实验datalinklayersimulationWord文件下载.docx
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a.Stop-and-wait
b.Go-back-Nwith w=7
c.Go-back-Nwith w=127
d. Selectiverejectwithw=7
e.Selectivereject withw=127
Do alloftheprecedingfor thefollowingvaluesof a:
0.1, 1,10,100.Drawconclusions aboutwhichtechniqueis appropriateforvariousrangesofa.
2.实验结果
A=0.1
A=1
A=10
A=100
a=0.1时,W=7或者127都是大于2a+1;
a=1时,W=7或者127都是大于2a+1;
a=10时,则选择拒绝和返回N都是一个分段函数.
a=100时,则选择拒绝和返回N都是一个分段函数。
3.实验程序
Figure7.12
a=0:
0.1:
1000;
W = [1,7,127];
forj=1:
3
fori =1:
length(a)
ifW(j)>
=2*a(i)+1
U(i)=1;
else
U(i)=W(j)/(2*a(i)+1);
end
end
ifj==1
W1=U;
end
ifj==2
W7=U;
ifj == 3
W10=U;
end
end
plot(a,W1);
holdon;
plot(a,W7);
plot(a,W10);
set(gca,'xscale'
'log');
axis([0.1100001]);
Figure7.13
a = 0:
0.1:
1000;
W=[1,7,127,127];
P=10^(-3);
forj=1:
4
fori=1:
length(a)
ifW(j) ==1
U(i)=(1-P)/(1+2*a(i));
end
ifW(j)==7
if W(2)>=2*a(i)+1
U(i)= 1-P;
else
U(i) = W(j)*(1-P)/(2*a(i)+1);
end
end
ifW(j)==127
ifW(j)>
=2*a(i)+1
U(i)=(1-P)/(1+2*a(i)*P);
Y(i) =1-P;
else
U(i)= W(j)*(1-P)/((2*a(i)+1)*(1-P+W(j)*P));
Y(i)= W(j)*(1-P)/(2*a(i)+1);
end
end
ifj==1
W1=U;
ifj==2
W7=U;
if j==3
W10= U;
end
ifj == 4
W=Y;
end
plot(a,W1);
holdon;
plot(a,W7);
plot(a,W10);
plot(a,W);
set(gca,'xscale','
log');
axis([0.11000 01]);
2、Draw
functionU=stopandwait(a,P)
U=(1-P)./(1+2*a);
end
functionU=selective_reject(a,W,P)
U=(1-P).*(W>
=2*a+1)+W.*(1-P)./(2.*a+1).*(W<2*a+1);
functionU=gobackn(a,W,P)
U=(1-P)./(1+2.*a.*P).*(W>=2*a+1)+W.*(1-P)./(2.*a+1)./(1-P+W.*P).*(W<
2*a+1);
end
functionlab2_draw(a)
P=0:
0.1:
1000;
U=stopandwait(a,P);
semilogx(P,U,'
r'
);
holdon
U=selective_reject(a,7,P);
semilogx(P,U,'
g');
holdon
U=gobackn(a,7,P);
semilogx(P,U,'
b'
);
hold on
U=selective_reject(a,127,P);
semilogx(P,U,'
k');
holdon
U=gobackn(a,127,P);
semilogx(P,U,'
y'
ylabel('
Utilization'
) ;
xlabel('
P'
legend('
Stop-and-wait','
Go-back-Nwithw=7 ','
Go-back-N withw=127','
Selectiverejectwithw=7','
Selectiverejectwithw=127 '
,3)
end
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