CFSFDP-E Algorithm

1  Input: $r_{\max }$, $N$, $\eta$

2  For each round $r$

3    For each node $i$

4      calculate its residual energy $E_i$

5      If $E_i$ > 0

6        the node is still alive, calculate its local density ${\rho }_i$, distance ${\delta }_i$ and density-energy ${\omega }_i$

7        calculate ${\gamma }_i$

8        If ${\gamma }_i$ > $\eta$

9          select node $i$ as cluster head

10      end

11     else

12      the node $i$ is dead

13     end

14     Sort all the $\omega$ in descending order

15     Allocate normal nodes into several clusters based on the value of $\omega$

16     Data transmission phase

17   end

18 end