Information Technology Reference
In-Depth Information
Fig. 4.
Modify Route Request Message
Fig. 5.
Set energy in RREQ Message
From Fig. 5, source node (S) sent the information to a Destination node (D). At the
beginning source node will broadcast RREQ and set energy parameter in RREQ
message to 100%. When node 1 receives RREQ message, it will check the routing
table. If the route is not found, node 1 has the energy at 20%. The energy in RREQ
has been update to 20% when the energy in Node 1 is less than the energy in
RREQ. Then the RREQ is broadcasted to the neighbor nodes. When Node 2 receives
RREQ from Node 1, there is no need to update the energy in RREQ due to the
remaining energy in node 2 is larger than RREQ. When the destination receives
RREQ message from Node 2, it will set energy in routing table and sent RREP back
to source node (via node 1,2). If the destination receives multiple RREQ messages in
the same time, the algorithm of energy update will be explained in Fig. 6.
The destination receives the first RREQ message from Node 2. After that it
receives the second RREQ message from Node 4. In the original AODV, if a
destination receives RREQ the same source it will discard the second RREQ message.
