1. ZigBee protocol stack overview
Embedded Systems Software Training Center
ZigBee protocol stack overview
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2. Assumptions for Using this Teaching Material
DSR and OTSL takes no responsibility about the problem which occurs as a result of applying the technical information written in this document in a commercial product, although the information is based on actual
implementation and our experiences, is reliable enough.
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3. Agenda Basic ZigBee overview 802.15.4 basics Architecture of Zigbee
ZigBee Profiles
Historical necessity of ZigBee
Technical trend and application examples of ZigBee
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4. Objectives Understand 802.15.4 basics
Understand Zigbee basics and applications
Understand Zigbee basic architecture
Understand Zigbee most common issues.
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5. Basic ZigBee Overview
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6. Basic ZigBee overview
ZigBee is a specification for a high level protocol stack using small, low-power and low-cost radios. It based on IEEE standard for Personal Area Network.
ZigBee standard maintained be ZigBee Alliance (
Usually vendors of ZigBee devices use system-on-chip (SoC) solutions with integrated radio and KB of flash memory.
ZigBee data transmission rate varies from 20 to 900kbits.
For non-commercial purposes, the ZigBee specification is available free to the general public. An entry level membership in the ZigBee Alliance ( Adopter ), provides access to draft specifications and permission to create products for market using the specifications.
The requirements for membership in the ZigBee Alliance causes problems for open-source developers because the annual fee conflicts with the GNU GPL
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7. basics
IEEE specifies physical and MAC layer of low- rate WPANs.
It could be and it used as a basis for different protocols and standards. ZigBee, WirelessHART, 6LoWPAN etc.
IEEE specification:
802 = networking group
15 = wireless network
4 = low data rate consuming less power
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8. 802.15.4 basics It operates one of the following bands:
MHz: Europe, allows one communication channel
MHz: North America, up to ten channels (2003), extended to thirty (2006)
New 950–956 MHz band in Japan (2006)
MHz: worldwide use, up to sixteen channels (2003, 2006)
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9. basics

10. baud rates
The original 2003 version: 868/915 MHz bands with transfer rates of 20 and 40 kbit/s, 2450 MHz band with a rate of kbit/s.
The 2006 revision improves the maximum data rates of the 868/915 MHz bands, bringing them up to support 100 and kbit/s as well.
In August 2007, was released ultra-wideband (UWB) PHY is allocated frequencies in three ranges: below 1 GHz, between 3 and 5 GHz, and between 6 and 10 GHz. Support uo to 900kbit/s.
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11. 802.15.4 basics It could use both amplitude and phase keying
Has guaranteed time-slots.
Uses network beaconing.
Has no routing mechanism, so, only star and peer-to- peer allowed.
Enables the transmission of MAC frames through the use of the physical channel. Controls frame validation, guarantees time slots and handles node associations. Finally, it offers hook points for secure services.
And the main: Most of the applications often uses only part of that is suitable for their purposes.
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12. 802.15.4 Network model Full Function Device (FFD)
■ Capable of being the PAN Coordinator
■ Implements processing of “Association Request”
■ Implements a general model of communication which allows it to talk to any other device.
■ Implements processing of “Disassociation Notification”
Reduced Function Device (RFD)
■ Can only associate and communicate with a FFD

13. ZigBee Architecture
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14. ZigBee Architecture
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15. Architecture of ZigBee
Mac layer: controlling media, basic rf transmitting/receiving.
Network (NWK) layer: Routing, addressing, discovery and join.
APS (Application Support Sublayer): Bridge between NWK and upper layers. Binding tables, separate addressing scheme etc.  Routes messages across the layers of the protocol stack.
ZDO (ZigBee Device Object) layer: Different OTA stack parameters management, security keys and policies.
Application/Profiles: Profiles and customer's application.
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16. Architecture of ZigBee
The IEEE PHY layer includes features such as receiver energy detection (ED), link quality indication (LQI) and clear channel assessment (CCA). The network addressing follows 64-bit IEEE and 16-bit short addressing, supporting over 65,000 nodes per network. The IEEE MAC sub layer controls the access to the radio channel using unslotted CSMA-CA (Carrier Sense Multiple Access with Collision Avoidance) method. It is also responsible for flow control via acknowledgement and retransmission of data packets, frame validation, and network synchronization as well as support to upper layers for robust link operation. peer entity control transfers.
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17. Mac Layer The IEEE 802.15.4 MAC defines four frame structures:
The MAC frame structure has been designed to keep the complexity to a minimum while making the system sufficiently robust for transmissions on a noisy channel.
The IEEE MAC defines four frame structures:
· A beacon frame, used by a coordinator to transmit beacons.
· A data frame, used for all transfers of data.
· An acknowledgment frame, used for confirming successful frame reception.
· A MAC command frame, used for handling all MAC (Association Request, Response, Disassociation, Data request, Beacon request e.t.c)
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18. NWK Layer
NWK layer handles network addressing and routing by invoking actions from MAC layer.
Starting the network.
Assigning network addresses.
Adding/removing devices to/from network.
Routing messages to the intended destination
Applying security to the incoming/outgoing messages.
Discovery and store routing information
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19. APS Layer
APS layer responsible for communication with relevant applications and endpoints. As well as for managing binding table.
Here's significant application concepts:
A node may have several applications running on it - for example, a node in an environment monitoring network may be measuring temperature and humidity, each of which is an application. These application instances on a node are said to be endpoints, where messages can originate and terminate.
In order to route messages arriving at the node to the appropriate application, each application on the node must be uniquely identified and is given an endpoint address. Endpoint addresses for user applications are numbered from 1 to 240. Therefore, to identify a particular application instance in a ZigBee network, you need to supply the relevant network address and then the required endpoint address on the node.
Endpoint address 255 can also be used. This is the broadcast endpoint address
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20. ZigBee Cluster Library (ZCL)
Cluster is a structure of message or the message itself. Most of the clusters have pair. For example for input and output messages.
ZigBee cluster library, a set of common clusters and attributes used across multiple application profiles.

21. ZDO Layer
Endpoint address 0 on each node is reserved for a special application called the ZDO (ZigBee Device Objects). This application has a number of roles, including defining the type of node (Co-ordinator, Router or End Device), initialising the node and participating in network creation.
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22. ZigBee Application Profiles
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23. Application Profiles
Every data request in ZigBee is sent (and received) on an Application Profile. Application Profile IDs are 16-bit numbers and range from 0x0000 to 0x7fff for public profiles and 0xbf00 to 0xffff for manufacturer-specific profiles.
Think of a profile as a domain space of related applications and devices. Public profiles are those specified by the ZigBee Alliance (as opposed to private profiles specified by individual OEMs).
Nearly all public profiles use the ZigBee Cluster Library, so I'll leave the example and details to Chapter 6, "The ZigBee Cluster Library."
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24. Application Profiles
The current list of application profiles either published, or in the works are:
Released specifications
ZigBee Home Automation
ZigBee Smart Energy 1.0
ZigBee Telecommunication Services
ZigBee Health Care
ZigBee RF4CE - Remote Control
Specifications under development
ZigBee Smart Energy 2.0
ZigBee Building Automation
ZigBee Retail Services
ZigBee Light Link .
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25. Historical necessity of ZigBee
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26. Why ZigBee? Mesh Networking Technology Open Global Standard
Self-healing mesh networks
Low cost, long battery life, good range, secure
Open Global Standard
2.4GHz is unlicensed, available Worldwide
Anyone can join the ZigBee Alliance
Where can ZigBee fit?
Secure, reliable, Personal Area Networks for sensor, control and low bandwidth data communications.
It’s a low power wireless technology that's ideal for new and old infrastructures.
It can have range between 10m and 2km (with PA) Scalable Networking solutions
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27. Bluetooth vs. WiFi vs. ZigBee vs. Others
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28. Technical Trends and Application Examples
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29. Application Examples
ZigBee is well suited for a wide range of control uses in just about any market. The Alliance has focused its standards development efforts around the commercial, residential, energy, consumer and industrial sectors. It has developed global standards for energy management and efficiency, home and building automation, health care and fitness, telecom and consumer electronics. Here are just a few examples of what our standards control:
Demand Response
Advanced Metering Infrastructure
Automatic Meter Reading
Lighting controls
HVAC control
Heating control
Wireless smoke and CO detectors
Home security
Blind, drapery and shade controls
Medical sensing and monitoring
Remote control of home entertainment systems
Indoor location sensing
Advertising on mobile devices
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30. Technical Trends
The main trend in Zigbee development is improving power management and stack interoperability. These features called Smart Energy 2.0.
The Smart Energy 2.0 effort was launched in 2008 to offer IP-based HAN functionality. It will address the following emerging market requirements:
Deployments in multi-dwelling units
Support multiple Energy Service Interfaces into a single premise
Supports any transport layer based on IETF IP compliant standards, including but not limited to ZigBee IP, other RF-based and Power Line Carrier (PLC)-based transports
Support internationally recognized standards to ensure long-term interoperability with multiple technologies
Accomplishing these goals has led to the adoption of networking standards that ensure interoperability between ZigBee and other network technologies. The ZigBee Alliance is developing an internet protocol (IP) networking layer called ZigBee IP, which is based on the IETF-based 6LoWPAN technology. The application clusters for Smart Energy have been mapped to the IEC Common Information Model, that will be implemented in Smart Energy This provides a migration path for features defined in ZigBee Smart Energy 1.X to be supported in Smart Energy 2.0.

31. Technical Trends
The ZigBee home area network standard already has lots of challengers (Z- Wave, Wi-Fi, and HomePlug to name just three). Now it faces an assault from the biggest, baddest billion-dollar bully of them all – Google.
Google recently announced it will create its own home networking standard as part of its initiative
J. Berst. The founder and chief analyst of Smart Grid News.com
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32. The End
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