In our simulations, we divided every round into several
time slots. The length of the slot is equal to the time of node
wake up. Table 3 summarizes the results with initial energy
per node of 0.25, 0.5 and 1.0 J for the 1003100-m networks.
The simulation results show that our proposed protocol
achieved approximately a 10% increase in the number of
rounds compared with LEACH when 1% and 20% of the
nodes died, respectively. After 20% of the nodes died, the
LEACH protocol was better than our proposed protocol. In
fact, the direct transmission protocol works best under this
situation. This is because the distances between the live nodes
become greater, and the nodes have to form a cluster, which
more often causes the energy to drain rapidly.