ZigBee 802.15.4 and the ZigBee Alliance Motorola 802.15.4/ZigBee™ Platform
zigbee full ppt
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ZIGBEE
S.Ranjitha
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WHAT IS ZIGBEE
Technological standard created for control and sensor networks
Based on the IEEE 802.15.4 standard Wireless personal area networks(WPANs) High level communication Frequency band up to 2.4GHz
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ZIGBEE GENERAL CHARACTERISTICS
Data rates of 20 kbps and up to 250 kbps Support for Low Latency Devices CSMA-CA Channel Access Low Power Usage consumption 3 Frequencies bands with 27 channels Extremely low duty-cycle (<0.1%) Supports large number of nodes Very long battery life
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ZIGBEE PROTOCOL STACK ARCHITECTURE
Defined in zigbee specification
Defined in 802.15.4 standard
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PHY LAYER TASKS
Activation and deactivation of the radio transceiver
• Transmitting• Receiving• Sleeping
Receiver Energy Detection
• Estimating received signal power
Link Quality Indication
• Quality of a received signal• Tune its transceiver in to specific channel
Clear Channel Assessment
• Energy Detection mode• Carrier Sense mode• Carrier Sense with Energy Detection mode
Channel Frequency Selection
• Tune its transceiver in to specific channel
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MODES IN MAC LAYER
802.15.4 MAC
BEACON-ENABLED MODE
Super frame
Contention access period(without GTS)
Slotted CSMA/CA
Contention Free Period(with GTS)
Slotted CSMA/CA/slot allocations
NON BEACON-ENABLED MODE
Unslotted CSMA/CA
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SUPER FRAME
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NETWORK DEVICES
IEEE 802.15.4 device roles
FFD
PAN coordinator
Coordinator
Device
RFDZigbee device roles
Coordinator Router End
device
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DATA TRANSFER MODELS
Peer to peerStar
mesh
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COMMUNICATION MECHANISMS-I
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COMMUNICATION MECHANISMS-II
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NETWORK LAYER
NETWORK DATA SERVICE
Generates NPDU
Topology specific routing
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APPLICATION LAYERAPPLICATION
SUPPORT SUB-LAYER
•Maintaining tables for binding•Message forwarding between bound end devices•Providing services
THE APPLICATION FRAMEWORK
•Key Value Pair service•Generic Message service
APPLICATION OBJECTS
•Manufacturer defined component• Holds key-value attributes
ZIGBEE DEVICE OBJECT
•Role of the device•Responsible for Discovery
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ZIGBEE ROUTING IN A MESH NETWORK
S
a
C
T
D
Discard route request B
Unicast
Broadcast
Without routing capacity