g., on a dedicated ship), or can be placed on seabirds.
2. Data Gathering Protocol: The sensors gather various data related to
the whales, and store the information as a time-tagged packets in their
memory. Whenever a whale comes in proximity of a sink, i.e., the sink
is within the communication range of the sensor, the gathered data is
transmitted to the sink using single-hop transmissions. To reduce the potentially
large delay due to high whale mobility and limited number of
sinks, the sensor nodes share their measured data with each other. In
other words, when two sensor nodes come within communication range
of each other, some or all of the packets of each of the sensor nodes are
replicated on the other sensor node via single-hop communication. When
a node is able to communicate with a sink, it o??oads all the data it has
gathered, i.e., its own measurements, and the measurements replicated
from other nodes. Thus, with a higher number of nodes, the data measured
by a node will be replicated on more nodes, and consequently, the
delay in reporting this measurement to the sink is reduced.
25 Chapter 1 Design of Large-scale Sensor Networks
Aravind Iyer et al.
3. Packet Replication and Bu?®er Dimensioning: While packet replication
reduces delays, it results in increased storage requirements at each
node. A naive way to replicate packets would be for two nodes to exchange
all their measurements with each other.
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