Embedded controllers in wireless sensor networks (WSNs) efficiently collect and process data from sensors, then communicate with other nodes. The document discusses various configurations such as different interaction patterns, types of sources and sinks, and the challenges posed by communication limitations over distances. It highlights the necessity of relay stations and the complexity of data management when multiple sources and sinks are involved.

1. Presented by
D.S.MYDHEESWARAN
N.SIVA
N.NITHYA

2.  Embedded controllers are small, specialized
computers that are integrated into sensor
nodes.
 They collect data from sensors, processing the
data, and communicate with other nodes in the
network. These controllers are designed to be
very efficient to save energy.

5.  These scenarios vary widely based on the
requirements of the application, the characteristics
of the environment, and the objectives of the
sensor network deployment.
◦ Types of sources and sinks
◦ Single-hop and multi-hop networks
◦ Multiple sinks and sources
◦ Three types of mobility

6.  Several typical interaction patterns found in WSNs – event
detection, periodic measurements, function approximation and
edge detection, or tracking.
 Sources: Any node that provides data / measurements or the
actual nodes that sense data.
 Nodes where information is generated.
 Sinks: Nodes where information is required.
 These sinks sometimes are part of the sensor network itself.
 Sometimes outside the network (Ex: The firefighter’s PDA
communicating with a WSN)
 Is part of an external network (Ex: Internet), somehow connected
to the WSN
 The sink is not interested in the detection of parameters like
source node; In sink data itself is much more important.

8.  The inherent power limitation of radio
communication follows a limitation on the feasible
distance between a sender and a receiver.
 Because of this limited distance, the direct
communication between source and sink is not
always possible, specifically in WSNs, which are
intended to cover a lot of area / ground (Ex: In
environmental or agriculture applications) or that
operate in difficult radio environments with strong
attenuation (Ex: In buildings).
 To overcome limited communication distances in
Wireless Sensor Networks (WSNs), relay stations can
be used

9.  In many cases, there are multiple sources
and/or multiple sinks present.
 In the most challenging case, multiple sources
should send information to multiple sinks,
where either all or some of the information has
to reach all or some of the sinks.

11. Node mobility
Sink mobility
Event mobility