zigbee networks full report

[seminar class]

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 Introduction
What is Zigbee?
 Technological Standard created for control and sensor networks.
 Based on IEEE 802.15.4 Standard.
 Developed By Zigbee Alliance
Motivation
The ZigBee standard was developed to address the following needs:
• Low cost and secure
• Reliable and self healing
• Flexible and extendable
• Low power consumption
• Easy and inexpensive to deploy
• Global with use of unlicensed radio bands
• Integrated intelligence for network set-up and message routing
The ZigBee Name
 Named for erratic, zig-zagging patterns of bees between flowers
 Symbolizes communication between nodes in a mesh network
 Network components analogous to queen bee, drones, worker bees
IEEE 802.15.4 & ZigBee In Context
IEEE 802.15.4 Overview
 Standard for Low- rate Wireless Personal Area Networks (LR-WPANs)
 Includes features such as low power consumption , high density of nodes per network , low cost and simple implementation
 Uses the unlicensed frequency bands 16 channels at 2.4 GHz , 10 channels at 915 MHz and 1 channel at 868 Mhz.
 Device types- PAN Coordinator , Fully Functional Device , Reduced Functional Device
 Topologies - star , peer-to-peer , cluster-tree
IEEE 802.15.4 PHY(Physical layer)
 Provides interface between MAC Layer and physical radio channel
 Consists of two services PHY data service, PHY management service which form the Physical Layer
Management Entity (PLME)
 Features are activation and deactivation of radio transreciever ,energy detection (ED), Link Quality Indication (LQI), channel selection , Clear Channel Assessment(CCA) and transmitting and receiving packet
• Each Physical Protocol Data Unit(PPDU) consists of Physical header , Synchronisation header and a variable payload
IEEE 802.15.4 MAC
 Interface between System Specific Convergence Sublayer (SSCS) and PHY
 Responsible for reliable communication between a node and its neighbours
 Two services MAC data service and MAC management service forming MAC Layer Management Entity
 MAC data service enables transmission and reception of MAC Data Protocol Units (MPDU)
 Features are beacon management , channel access , GTS management