EESS: An Energy-Efficient Spectrum Sensing Method by Optimizing Spectrum Sensing Node in Cognitive Radio Sensor Networks

Algorithm 1

Cluster formation algorithm based on optimal SSN selection.

Input: Optimal SSNs ratio p based on the Eq. (20);

All number of nodes in the network N;

The rest number of nodes in the network .

initialization: counter c = 0; constant C;

←Np, N - Np

for do

randomly selected SSN i sends a message containing a counter c and its ID to neighbor node

end of for

repeat until timer stops

for do

Timer i is on;

cc + 1;

if c <= C

then The neighbor node of SSN i forward its ID and count c;

end of for

end of repeat

for do

for do

if node j has the lowest count c among every SSN in

then node j join the SSN i

end of for

end of for

for do

if node j has similar messages among every node in

then node j select the SSN i who sent the first message

end of for

Output: clusters