TCN - Lecture 2
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Transcript of TCN - Lecture 2
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Wireless Sensor NetworksWireless Sensor Networks
(IEEE 802.15.4 RFC)(IEEE 802.15.4 RFC)
Presented By
Mr. Fasee UllahCUSIT
Peshawar
Lecture 2
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OutlinesOutlines
y Basic components of WSNs
y WSN Protocol Stack
y
Topology
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Components ofSensor NodeComponents ofSensor Node
y Sensor node consists of four main
components
Sensing unit
Processing unit
Transceiver
Power unit
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Sensing unitSensing unit
y Sensing unit has further subunits
Sensor
ADC
y The analog unit (ADC) produced analog
signal based on sensor observations and
converts into digital signal for further
processing
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processing unitprocessing unit
y It has also two units
Processor
Storage
y This processor is just like a computer
processor for various computational and
decision making purposes
y storage unit is used for storing of sensedinformation for future use
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Transceiver unitTransceiver unit
y Another component of sensor node
which has the capability to send and
receiver different input and output data
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Power unitPower unit
y last unit is power unit which is the vital
thing for sensor nodes and sensor
network
y Used to maintain the voltage of the
sensors
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Sensor Node ArchitectureSensor Node Architecture
Figure : Components of Sensor Node [1]
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Optional unitsOptional units
y Dotted format is optional
y Sensor node also requires the knowledgefrom other node and accurate routing path,
to achieve this target use locationfindingsystem.
y Mobilizeris the feature of the sensornetwork
y Sometimes sensor required to move todifferent directions to find out the assignedtasks can do through mobilizer
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Sensor Network Protocol Stack
Figure: Sensor NetworkProtocol Stack [1]
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Protocol StackProtocol Stack
y Added some extra functionality to handle andmonitor the Power
Movement
Task distribu
tion among different sensor nodes.y Powermanagement plane monitors the power of
each sensor usage
y Mobility management plane observes themovement of sensor
y
keeps update the list of neighbors in registryy Taskmanagement plane assigns tasks and schedule
to different sensing devices in dynamic environment
y The aim of these tasks is to share resources
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Application layer protocolsApplication layer protocols
y Sensor Management Protocol (SMP), Task
Assignment and Data Advertisement
Protocol(TADAP), Sensor Query and Data
Dissemination Protocol (SQDDP) [1]
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Direct DiffusionDirect Diffusion
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Sensor Network TopologySensor Network Topology
y Pre-deployment anddeployment
phase
y All the sensor nodes must be placed in
sensor filed with some specific
arrangement
y This arrangement must maintain by
human or roboty used in battlefield to drop from plane
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PostPost--deployment phasedeployment phase
y Topology is changed due to sensor nodes
displacement
y The conditions of topology can change
any time according to the needs of sensor
nodes
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Redeployment ofadditionalRedeployment ofadditional
nodes phasenodes phasey Due to continuous changes in topology
need some nodes to add in sensor filed
y in some situation to replace sensor node
due to malfunction