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12
K Zahedi et al. / International Journal of Computer Networks and Communications Security, 1 (1), JUNE 2013

Fig. 2. PDR and No. of nodes per route

In this figure, we can see that the (Packet
delivery ratio) is decreasing for both protocols as
the number of nodes per route is increasing, but the
decreasing in the case of (DSR modified) is much
less than the decreasing in the (DSR original). The
reason of decreasing in the PDR is that when the
number of nodes in the route increases this means
that the number of links in that route also increases,
so the probability of link breakages occurrence also
increases. Also, we can notice that the difference in
PDR between the two protocols is big when the
number of nodes per route is low (as it is clear
when there is 5 nodes), but this difference is
reduced gradually as the number of nodes per route
increases (as it is clear when there is 50 nodes).
The reason behind this is that the increase in the
number of nodes per route reduces the efficiency of
the new mechanism where link breakages will so
frequently occur.

Fig. 3. No. of dropped packets and No. of nodes per route

In this figure, we can see that the (Number of
dropped data packets) is increasing for both

protocols as the number of nodes per route is
increasing, but the increasing in the case of (DSR
modified) is much less than the increasing in the
(DSR original). The reason of increasing in the
number of dropped data packets is that when the
number of nodes in the route increases this means
that the number of links in that route also increases,
so the probability of link breakages occurrence also
increases. Also, we can notice that the difference in
the number of dropped data packets between the
two protocols is big when the number of nodes per
route is low (as it is clear when there is 5 nodes),
but this difference is reduced gradually as the
number of nodes per route increases (as it is clear
when there is 50 nodes). The reason behind this is
that the increase in the number of nodes per route
reduces the efficiency of the new mechanism where
link breakages will so frequently occur.

Fig. 4. Delay and No. of nodes per route

In this figure, we can see that the (Average End
to End Delay) is increasing for both protocols as the
number of nodes per route is increasing, but the
increasing in the case of (DSR modified) is much
less than the increasing in the (DSR original). The
reason of increasing in the average end to end delay
is that when the number of nodes in the route
increases this means that the number of links in that
route also increases, so the probability of link
breakages occurrence also increases. Also, we can
notice that the difference in the average end to end
delay between the two protocols is big when the
number of nodes per route is low (as it is clear
when there is 5 nodes), but this difference is
reduced gradually as the number of nodes per route
increases (as it is clear when there is 50 nodes).
The reason behind this is that the increase in the
number of nodes per route reduces the efficiency of
the new mechanism where link breakages will so
frequently occur.
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