Biomedical Engineering Reference
In-Depth Information
Fig. 1 Architecture of the
protocol
• If a node does not meet a ferry during its movement, it will stay at a point and
wait for the arrival of the ferry.
• The buffer of a ferry is limited.
• The ferry gathers every node's location information present in its zone and
transfers it to the corresponding infostation.
The Algorithm
The basic steps involved in the routing process are as follows:
1. A sender node waits for a ferry.
2. When in contact it transfers its own ID, the message and the receiver details to
the ferry.
3. If the receiver is in the same zone, the ferry delivers the message, and
acknowledges the infostation and the sender.
4. Else the ferry transfers the message and receiver details to the infostation.
5. The infostation either forwards the message to some other ferry (in case of
adjacent zone) or it forwards the message to its parent infostation (in case of
non-adjacent zone).
6. The message climbs up the hierarchy of infostations until it encounters an
infostation which has the receiver registered in its buffer.
7. Now, the message descends the hierarchy to Level 1 infostation to the ferry and
finally to the receiver.
The proposed protocol has advantages over the Infostation model and the
Message-ferrying approach. The Infostation model based routing has a single
point of failure. If the head infostation fails, the whole network will become dead.
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