Saturday, June 25, 2011

Generation of M|M|1 model [Matlab]


clc;
clear all;
arrival_rate = input('Enter the arrival rate : ');
service_rate = input('Enter the service rate : ');
error_rate = input('Enter the max acceptable packet loss : ');
timeslots = input('Enter the number of timeslots : ');
t = 1:timeslots;
tarr = zeros (1,timeslots);
tser = zeros (1,timeslots);
tarr(1,:) = poissrnd( arrival_rate, 1, timeslots);
tser(1,:) = poissrnd( service_rate, 1, timeslots);
%Timeslot vs Packet loss
n = zeros (1,timeslots);
for j = 1:timeslots
if ( tarr(1,j) > tser(1,j) )
n(1,j) = ( tarr(1,j) - tser(1,j) ) ;
end
end
bar (t,n,.01);
xlabel ('Timeslot');
ylabel ('Packet loss');
disp ('The max packet loss is :');
disp (max(n));
disp ('The average packet loss before buffering is :');
avg = mean(n);
disp (avg);
%Buffer size vs Packet loss
buff = 0;
count = 1;
avg_loss(1,count) = avg ;
buffer_size(1,count) = buff;
while (avg > error_rate)
count = count+1;
buff = buff+1;
tser = tser+1;
for j = 1:timeslots
if (n(1,j) > 0)
n(1,j) = (tarr(1,j) - tser(1,j));
end
end
avg = mean(n);
avg_loss (1,count) = avg;
buffer_size (1,count) = buff;
end
disp('The maximum packet loss after buffering is :');
disp(avg);
disp('The maximum buffer size for the given error rate is :');
disp(buff);
figure(2);
line (buffer_size,avg_loss);
xlabel('Buffer size');
ylabel('Packet loss');

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