Fig: 7, 8, 9, shows the graphs for end to end delay versus pause time. From these graphs we see
that the average packet delay increase for increase in number of nodes waiting in the interface
queue while routing protocols try to find valid route to the destination. Besides the actual
delivery of data packets, the delay time is also affected by route discovery, which is the first
step to begin a communications session. The source routing protocols have a longer delay
because their route discovery takes more time as every intermediate node tries to extract
information before forwarding the reply. The same thing happens when a data packet is
forwarder hop by hop. Hence while source routing makes route discovery more profitable, it
slows down the transmission of packets.
Out of the tree routing protocols, Q-CBRP has the shortest average end to end delay. Then
CBRP and AODV.
The AODV protocol is already the best which provide End To End delay in a mesh network
following previous researchs; In our case the use of a clustering approach, due to
communications between Cluster Head (CH) and gateway and only between CH and mesh
users, these facts reduced the network load and automatically improves Delay in Mesh
networks