1.zigbee final architecture

8/2/2019 1.ZigBee Final Architecture

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LOGO

ZigBeePresentation by

Srinivas Shenoy A.

Yateesh Kumar.M.N.


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Outline

Introduction.ZigBee Architecture.

ZigBee Topologies.

Initialization And Operation.ZigBee Advantages And Applications.


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Introduction.


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What it is?

ZigBee is an established set of specifications for wireless

personal area networking (WPAN), i.e. digital radioconnections between computers and related devices.

It is ratified under IEEE 802.15.4 Wireless NetworkingStandards.

IEEE 802.15.4-2006 is a standard which specifies thephysical layer and media access control for low-ratewireless personal area networks (LR-WPANs).

ZigBee is targeted at radio-frequency (RF) applications

that require a low data rate, long battery life, and securenetworking.


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General characteristics.


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Bluetooth vs. IEEE

802.15.4.Bluetooth based WPAN Few devices

Data range is 10m to

100m Data rate is nearly

1Mb/s

Power consumption is alow.

Battery life is low.

Star only.

IEEE 802.15.4 LR-WPAN

Many devices

Data range is nearly10m

Data rate is 20kb/s,40kb/s,250kb/s.

Power consumption isultra low.

Battery lasts years. peer to peer, Star,

Tree, Mesh.


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Zigbee vs Wifi

zigbee

Data range 0-10 meters.

Data rate is

20,40,250kb/s. Power consumption is

ultra low.

Battery life is high.

Star, tree or meshtopology.

wifi Data range 50-100m

Data rate is 11,54Mb/s.

Power consumption ishigh.

Battery life is very low.

Point to hub topology.


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ZIGBEE alliance.

The ZigBee Alliance is an association of companiesinvolved with building higher-layer standards basedon IEEE 802.15.4. This includes network, security,

and application protocols. A rapidly growing, worldwide, non-profit industry

consortium consisting of Leading semiconductormanufacturers, Technology providers, End-users.

An Organization with a mission to definereliable, cost-effective, low-power, wirelesslynetworked, monitoring and control productsbased on an open global standard.


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Architecture.


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Basic Architecture.


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Basic Architecture.

1.Application Level

The Application level contains the applications that runon the network node.

2.ZigBee Stack Level

It consists of stack layers concerned with networkstructure, routing and security (encryption, keymanagement and authentication).

3.Physical/Data Link Level

The Physical/Data Link level is concerned with low-levelnetwork operation such as addressing and messagetransmission/reception.


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IEEE 802.15.4 PHY

Features

Activation/Deactivation of radio transceiver

Energy Detection (ED) Link Quality Indication (LQI)

Channel Selection

Clear Channel Assessment (CCA) Transmission/Reception of packets over

physical medium


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IEEE 802.15.4 PHY

PLCP protocol data unit

Gives details about all the informationcollected above.

Consists of SHR and PHR.


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IEEE 802.15.4 MAC

Features The Media Access Control (MAC) sub-layer.

Is a sublayer of the Data Link Layer specified in theseven-layer OSI model (layer 2).

It provides addressing and channel access controlmechanisms that make it possible for severalterminals or network nodes to communicate withina multi-point network.


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IEEE 802.15.4 MAC

The MAC layer addressing mechanism is calledphysical address or MAC address.

A MAC address is a unique serial number.

Once a MAC address has been assigned to aparticular piece of network hardware, that deviceshould be uniquely identifiable amongst all othernetwork devices in the world.

This guarantees that each device in a networkwill have a different MAC address.


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Application layer.

EndpointsThese application instances on a nodeare said to be endpoints, wheremessages can originate and terminate.

Endpoint addresses for userapplications are numbered from 1 to 240.Endpoint 255 can be used to send datato all applications on a node.

ZigBee Device Objects (ZDO)Endpoint address 0 on each node isreserved for a special application calledthe ZDO (ZigBee Device Objects).


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Application frameworks and saps

Application Framework

The Application Framework (AF) contains theapplication objects and facilitates interaction between theapplications and the APS layer

Service Access Points

A Service Access Point (SAP) implements a set ofoperations to pass information and commands betweenlayers


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There are usually four types of operation implemented

by a SAP:1. Request .

2. Confirm.

3. Response.

4. Indication.


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1.zigbee final architecture

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