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A First Introduction to
Wireless Sensor Networks
Aparna S BalanVidya Academy of Science and Technology,
Thrissur -680 501, India
16 July 2010
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Wireless Sensor Networks
→ Number of sensors spread across a geographical area.
→Each sensor has → wireless communication capability
→ some level of intelligence
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A
B
KC
D
E
H
I
JSink
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Control
SignalProces
sorSensors
Wireless
Transmitte
r/ Receiver
Processing And Decisio
n Making
Schematic of Node
Power
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Classification of Sensor Networks
→Proactive → provides the snapshot of the relevant parameters at regular intervals
→Reactive→ nodes react immediately to the events
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Protocols for Sensor Networks
→To avoid collision at a time only one node will transmit
→ Static channel allocation→If N node, bandwidth is divided into N equal partitions
→ Dynamic channel allocation
→No fixed assignment of bandwidth
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Protocols for Sensor Networks
→ Directed Diffusion→ SPIN→ Hierarchical Routing→ Cluster-Based Routing→ LEACH
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Base Station
Second Level Cluster HeadFirst Level Cluster HeadSimple Sensor Nodes
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Goal of WSN
→ Determine value of some parameters
→ Detect the occurrence of events
→ Classify a detected object
→ Track an object
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WSN requirements
→Large number of sensors
→Low energy use→ Network self-organization
→ Collaborative signal processing
→ Querying ability
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Applications
→ Defense Application→ Crisis-Management Applications
→ Detect Environmental changes
→ Motor Vehicle traffic monitoring
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Thanks …