4.1 Results of Both Technologies In

4.1 Results of Both Technologies Individually
The performance of each technology is represented by the
following set of results with out the existence of the other. In
fig. 1(a) it can be observed that, as the number of Wi-Fi
nodes increases from 3 to 9, delivery ratio decreases from
94.8% to 73.2% due to more collisions of packets. This will
result in increasing the end to end delays shown in fig. 1(b)
from 0.03 at 3 nodes to around 0.5 seconds 9 nodes. Fig.
2(a) shows the original results for ZigBee nodes in a clear
site environment. Since ZigBee operates with the PAN
coordinators according to predefined schedule, then ZigBee
nodes don't effect each other for any number of nodes.
However, as it can be seen in fig.2(b) as the number of
nodes increases, the average end to end delay will increase.