443Performance Evaluation ofFlooding Algorithms forWireless Sensor Networks
In the third step, see Figure 16.4, notications keep on ooding the network, reaching the S sink
node. At this stage, the gateway gets notications about exactly the same event from three different
devices replicated. It is an obvious advantage should high notication reliability be required. Nodes
1, 16, and 19 only receive notications and are not allowed to relay them due to exceeded TTL.
Thisis why, in step four, sensor nodes 4, 11, and 14 do not get any messages. In Figure 16.5, local
loop prevention and message expiration can be observed. The sink receives one more event message
from node number 6. In the fth step, the sensor with an ID equal to 5 performs ...