An Energy Efficient Routing Protocol Based on Layers and Unequal Clusters in Underwater Wireless Sensor Networks

Algorithm 2

Next forwarder selection algorithm.

1: Procedure forwarder selection

2: for each head node Hi

3: for each head Hj neihgbors Hi’s LN-1 = Hj’s LN

4: calculate H_cost(j)

5: end for

6: select two nodes as forwarders with two largest H_cost

7: send N_DATA packet to forwarder

8: end for

9: for each node Ni received data packet

10: if next hop id1 in received packet = Ni’s id

11: if the data packet records

12:  record data packet

13:  forward data packet

14: else drop the data packet

15: end if

16: else if next hop id2 in received packet = Ni’s id

17: if the data packet records

18:  record data packet

19:  waiting for a certain time

20:  if not receive the same packet

21:  forward data packet

22:  else drop the data packet

23:  end if

24: else drop the data packet

25: end if

26: else drop the data packet

27: end if

28: end for