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Research Article: Althalji et al 78
LISTEN message does not arrive, then the sends a 'STOP' control message indicating that
mobile node will search for a new parent node . it is still within its domain. Otherwise, it will
• A node that has received a HERE message search for a new parent node . The child node
from a parent node has a timer run for 2.5 which receives 'HERE' control message waits for
seconds. If it does not receive another HERE a time "HERE INTERVAL". After this period, if it
message indicating that the node is moving does not receive another message, it has to wait
within its domain, then it will need to search for for an additional time. If it receives a 'STOP'
a new parent node . control message, this indicates that the node
•A node that received a HERE message from a has stopped and is still in the same radio range.
parent node and did not receive another If the child node does not receive the STOP
message after 2.5 seconds then has to wait for message, it will search for a new parent node .
0.5 seconds . After this period (STOP INTERVAL: The main purpose of this paper is to maintain
3 seconds), if it does not receive a STOP the networks from disconnection for long time
message, indicating that the mobile node has although of moving nodes, and to less changing
stopped and is still within its range, then this parent node, so we make the node stay
detects that this node is out of its range and will connected with the parent node although of its
need to search for a new parent node . movement while it still in its radio range. The
•After the node stops moving for 3 seconds, it proposed control message is sent to inform the
sends a STOP message to tell the child node that node of the change in the location of the parent
it has stopped. If the child node hears this node, which maintains communication
message, it will not search for a new parent between nodes by searching for the parent
node. Otherwise, it will search for a new parent node immediately if it moves. The advantages
node . The mechanism of the proposed protocol of the proposed message compared to previous
is described in Figure 6. When the mobile node works that it is more suitable for LLN networks
moves, it sends the proposed control message because it is sent only when node changes his
'HERE' to children and parent node. As the location so it does not increase the overhead in
parent node receives this control message, it the network.
SJSI – 2023: VOLUME 1-1
