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Mobility has become a hot research topic in WSN recently. In some of the
considered network models, the sink moves around the deployment region and
collects data from the sensor nodes. For example, in [5], mobile "Mules" are used as
forwarding agents. Another protocol, called SEAD, has been introduced in [6] where
access points are defined for the mobile sink to collect the data. In these approaches
the sink node moves randomly in the deployment area without a known travel path. In
fact, these approaches are geared for handling the sink motion rather than employing
such mobility to enhance the network performance. Unlike such work, this network configuration diagram
promotes mobility as a solution to the void around the sink problem. A novel Densitybased
Touring Strategy (DTS) is proposed where the sink node is programmed to
travel through areas that are highly populated with sensors in order to enhance the
performance.
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