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Copy pathEH_TDMA.m
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EH_TDMA.m
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% function [throughput,users] = EH_Access_TDMA(n_nodes,buff_cap,batt_cap,max_retx,backoff)
clear();
clc();
%%% INITIALISATION %%%
simlength = 10000;
batt_cap = 8;
buff_cap = 10 ;
% e_arr_v = [0 1] ;
% p_arr_v = [0 1] ;
max_retx = 0 ;
n_nodes = 2;
batt = randi([0 batt_cap],1,n_nodes);
buff = randi([0 buff_cap],1,n_nodes);
retx= zeros(1,n_nodes);
en_prob = 0.6;
pkt_prob = 0.8;
p_burst = 5;
e_burst = 3;
e_curr = zeros(1,n_nodes);
p_curr = zeros(1,n_nodes);
alpha = 0.4;
curr_state = zeros(1,n_nodes);
arr_count = zeros(1,n_nodes) ;
tx_count_t = 0;
tx_count = zeros(1,n_nodes) ;
drop_count = zeros(1,n_nodes);
drop_retx = zeros(1,n_nodes);
time = 0 ;
timer = zeros(simlength,1);
tx_count_v = zeros(simlength,1);
time_slot = zeros(simlength,2);
while time ~= simlength
e_arr_p = rand(1,n_nodes);
p_arr_p = rand(1,n_nodes);
time = time + 1;
for i = 1:n_nodes
slot = mod(time,n_nodes);
if slot == 0
slot = n_nodes;
end
time_slot(time , 1) = slot ;
time_slot(time , 2) = time ;
% modelling packet arrival with burstiness
if (p_curr(i) ==0)
if (p_arr_p >= (1/p_burst))
p_curr(i) = 1;
else
p_curr(i) = 0;
end
elseif(p_curr(i) == 1)
if (p_arr_p >= (pkt_prob/(p_burst*(1-pkt_prob))))
p_curr(i) = 0;
else
p_curr(i) = 1;
end
end
if(p_curr(i) == 1) %packet arrived
arr_count(i) = arr_count(i) + 1;
buff(i) = buff(i) + 1;
if(time_slot(time,1) == i) %choose which node's timer slot it is
if(batt(i)>0)
if(buff(i)>0)
tx_count(i) = tx_count(i) + 1 ;
tx_count_t = tx_count_t + 1;
retx(i) = 0 ;
buff(i) = buff(i) -1;
batt(i) = batt(i) -1;
end
elseif(batt(i)>batt_cap)
% if battery is full
batt(i) = batt_cap;
else % battery exhausted
if(buff(i)>0)
retx(i) = retx(i) + 1;
if(retx(i) > max_retx)
retx(i) = 0;
buff(i) = buff(i) - 1;
drop_retx(i) = drop_retx(i) + 1;
end
end
end
end
else %no packet arrived
if(time_slot(time,1) == i) %choose which node's timer slot it is
if(batt(i)>0)
if(buff(i)>0)
tx_count(i) = tx_count(i) + 1 ;
tx_count_t = tx_count_t + 1;
retx(i) = 0 ;
buff(i) = buff(i) -1;
batt(i) = batt(i) -1;
end
elseif(batt(i)>batt_cap)
% if battery is full
batt(i) = batt_cap;
else % battery exhausted
if(buff(i)>0)
retx(i) = retx(i) + 1;
if(retx(i) > max_retx)
retx(i) = 0;
buff(i) = buff(i) - 1;
drop_retx(i) = drop_retx(i) + 1;
end
end
end
end
end
if(buff(i) > buff_cap)
buff(i)=buff_cap;
drop_count(i) = drop_count(i) + 1;
end
% 2-state markov chain for energy arrival state if (e_arr_p(i) > en_prob)
if (e_curr(i) ==0)
if (e_arr_p(i) >= (1/e_burst))
e_curr(i) = 1;
else
e_curr(i) = 0;
end
elseif(e_curr(i) == 1)
if (e_arr_p(i) >= (en_prob/(e_burst*(1-en_prob))))
e_curr(i) = 0;
else
e_curr(i) = 1;
end
end
if(e_curr(i) == 1)
if(batt(i) < batt_cap)
batt(i) = batt(i) + 1;
end
end
end
timer(time,1) = time;
tx_count_v (time,1) = tx_count_t;
end
% end