The packet End-to-End delay is the average time that a packet takes to traverse the network.
This is the time from the generation of the packet in the sender up to its reception at the
destination’s application layer and it is measured in seconds. It therefore includes all the delays
in the network such as buffer queues, transmission time and delays induced by routing activities
and MAC control exchanges.
Various applications require different levels of packet delay. Delay sensitive applications such
as voice require a low average delay in the network whereas other applications such as FTP may
be tolerant to delays up to a certain level. MANETs are characterized by node mobility, packet
retransmissions due to weak signal strengths between nodes, and connection tearing and
making. These cause the delay in the network to increase. The End-to-End delay is therefore a
measure of how well a routing protocol adapts to the various constraints in the network and
represents the reliability of the routing protocol.
The Figures 8,9 &10 depict the average End-to-End delay for the DSDV, AODV and DSR
protocols for the number of nodes 50, 75 & 100 respectively as per Table 3. It is clear that
DSDV has the shortest End-to-End delay than AODV and DSR, because DSDV is a proactive
protocol i.e. all routing informations are already stored in table. Hence, it consumes lesser time than others. On average case, DSR shows better performance than AODV but worse than
DSDV. As AODV needs more time in route discovery, it produces more End-to-End delay.
From the above study on End-to-End delay, DSDV has high reliability than AODV and DSR.
The packet End-to-End delay is the average time that a packet takes to traverse the network.This is the time from the generation of the packet in the sender up to its reception at thedestination’s application layer and it is measured in seconds. It therefore includes all the delaysin the network such as buffer queues, transmission time and delays induced by routing activitiesand MAC control exchanges.Various applications require different levels of packet delay. Delay sensitive applications suchas voice require a low average delay in the network whereas other applications such as FTP maybe tolerant to delays up to a certain level. MANETs are characterized by node mobility, packetretransmissions due to weak signal strengths between nodes, and connection tearing andmaking. These cause the delay in the network to increase. The End-to-End delay is therefore ameasure of how well a routing protocol adapts to the various constraints in the network andrepresents the reliability of the routing protocol.The Figures 8,9 &10 depict the average End-to-End delay for the DSDV, AODV and DSRprotocols for the number of nodes 50, 75 & 100 respectively as per Table 3. It is clear thatDSDV has the shortest End-to-End delay than AODV and DSR, because DSDV is a proactiveprotocol i.e. all routing informations are already stored in table. Hence, it consumes lesser time than others. On average case, DSR shows better performance than AODV but worse thanDSDV. As AODV needs more time in route discovery, it produces more End-to-End delay.From the above study on End-to-End delay, DSDV has high reliability than AODV and DSR.
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