Zigbee Technolgy

By Anirudh2210413832

What is Zigbee?• ZigBee is a standard that defines a set of communication protocols for low data-rate,short-range wireless networking

• It has adopted IEEE 802.15.4 standards

• It operates in 3 frequencies (2.4 Ghz , 915Mhz , 868Mhz)

Zigbee characteristics

•Low cost•Low power consumption•Low data rate•Short range•Reliability•High security•Easy implementation & protocols

•Full – function devices•Reduced - funtion

devices

Types of devices

Device roles

• Coordinator• Router• End device

Networking topologies

Networking layers

Communication•It uses single frequency at a time•It implements simple channel access

mechanism CSMA-CA

CSMA-CA

Checks for channel clear and transmits data.

Channel clearEnergy detection method

Carrier sense method

Data transfer•DT to coordinator from device•DT to device from coordinator•DT between two peers

General characteristics•Data verification(16-bit Frame Check Sequence (FCS))

•Addressing •Association and dissociation•Binding•Self healing and self forming

PHY Packet format

MAC layerGenerating beacons (if the device is a coordinator)● Synchronizing the device to the beacons (in a beacon-enabled network)● Employing the CSMA-CA for channel access● Managing GTS channel access● Providing a reliable link between two peer MAC entities (two different devices)● Providing PAN association and disassociation services● Providing support for security; the MAC layer is responsible for its own securityprocessing, but the upper layers determine which security level to use

Mac packet formats

Nwk layer• Configuring a new device. For example, a new device can be configured to

begin• its operation as a ZigBee coordinator or try to join an existing network.• Starting a new network.

Modes of operation•Ideal mode•Transmit mode•Receive mode•Command mode•Sleep mode

•Thank you