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// Exa 6.10
// To calculate the data link protocol efficiency with
//(1) Stop and Wait protocol — full duplex,
//(2) SRP with window size W=8, and
//(3) Go-Back-N protocol with window size W=8.
clc;
clear all;
Tprop=4; //maximum propogation delay in sec
R=10; // data rate in Mbps
PackLen=400; //data packet length in bits
ACK=20; //length of ACK packet in bits
Tproc=1; //processing time(sec)
p=0.01;//probability that a data packet or its ACK can be corrupted during transmission
//solution
Tp=PackLen/R; //packet transmission time in microsec
Ta=ACK/R; // transmission time for an ACK in microsec
T=Tp+2*Tprop+2*Tproc+Ta;// total time for transmission time
// Stop and wait ARQ
Eff0=(1-p)*Tp/((1-p)*T+p*Tp);
//SRP with window size W=8
W=8;
Eff1=(2+p*(W-1))/(2+p*(3*W-1));
//Go-Back-N protocol with window size W=8
Eff2=1/(1+W*(p/(1-p)));
printf('The data link protocol efficiency with Stop and Wait protocol, SRP and GBN are \n %.3f, %.3f abd %.3f respectively\n',Eff0,Eff1,Eff2);
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