12-03-2011, 09:25 AM
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ZigBee Technology: Wireless Control that Simply Works
ABSTRACT:
Today most wireless industries focus on high data throughput, simple wireless connectivity, relaxed throughput, very low power and an inexpensive device. On the telecom front, numerous wireless technologies have been introduced in the country such as Wi-Fi, Wimax, Bluetooth,etc. Bluetooth is not the end of world. The engineers across the globe are working on solutions that can be customized according to user's needs. ZIGBEE is one such solution.Zigbee is the dominant technology among all other wireless devices because of its low cost, low power consumption, small size, fast and easy deployment.
This presentation involves the detail explanation about what is Zigbee, why we need it, how it works, advantages they offer and their limitations. Also explained are some of the possible that can make possible with it.
Zigbee is designed to provide highly efficient connectivity between small packet devices.Zigbee’s current focus is to define a general-purpose,inexpensive,self organizing mesh network that can be used for embedded sensing, medical data collection and home automation,etc.This keeps Zigbee far ahead from the existing technologies like Wi-Fi,Wimax and Bluetooth,etc.
This paper will outline Zigbee principles with a clear depiction.Additionally the comparision of Zigbee with other wireless devices is also mentioned.
INTRODUCTION:
Zigbee is a rather new wireless technology that looks to have applications in a variety of fields. Zigbee is a technological standard based on the IEEE 802.15.4 specification for low data rates in the Industrial, Scientific, and Medical (ISM) radio bands. The technology allows for devices to communicate with one another with very low power consumption, allowing the devices to run on simple batteries for several years. Zigbee is targeting various forms of automation, as the low data rate communication is ideal for sensors, monitors, and the like.
WHAT IS ZIGBEE?
ZigBee is a technological standard, based on the IEEE 802.15.4 standard, which was created specifically for control and sensor networks. In the Institute of Electrical and Electronics Engineers (IEEE), the 802 group is the section that deals with network operations and technologies. Group 15 works more specifically with wireless networking, and Task Group 4 drafted the 802.15.4 standard for a low data rate wireless personal area network (WPAN).
As can be seen in the figure, IEEE 802.15.4 defined MAC Layer and Physical (PHY) Layer address such things as the frequency and data rate specifications. ZigBee, meanwhile, develops the Network Layer and Application Layer, which includes the Applications Support Sub layer, the ZigBee Device Object, and the Security Services. The Network Layer and Application Layer are more specific than the IEEE layers and involves such things as how a ZigBee network is to be set up, how the devices in the network relate to one another, and so on.
ZIGBEE ARCHITECTURE: There are three different types of Zigbee devices:
5.1.ZigBee coordinator(ZC): The most capable device, the coordinator forms the root of the network tree and might bridge to other networks. There is exactly one ZigBee coordinator in each network since it is the device that started the network originally. It is able to store information about the network, including acting as the Trust Centre & repository for security keys.
5.2.ZigBee Router (ZR): As well as running an application function a router can act as an intermediate router, passing data from other devices.
5.3ZigBee End Device (ZED): Contains just enough functionality to talk to the parent node (either the coordinator or a router); it cannot relay data from other devices. This relationship allows the node to be asleep a significant amount of the time thereby giving long battery life. A ZED requires the least amount of memory, and therefore can be less expensive to manufacture than a ZR or ZC.
HOW ZIGBEE WORKS?
ZigBee basically uses digital radios to allow devices to communicate with one another. Every ZigBee network must contain a network coordinator. Other Full Function Devices (FFD' s) may be found in the network, and these devices support all of the 802.15.4 functions. They can serve as network coordinators, network routers, or as devices that interact with the physical world. The final device found in these networks is the Reduced Function Device (RFD), which usually only serve as devices that interact with the physical world.
The figure above introduces the concept of the ZigBee network topology. Several topologies are supported by ZigBee, including star, mesh, and cluster tree. Star and mesh networking are both shown in the figure above. As can be seen, star topology is most useful when several end devices are located close together so that they can communicate with a single router node. That node can then be a part of a larger mesh network that ultimately communicates with the network coordinator. Mesh networking allows for redundancy in node links, so that if one node goes down, devices can find an alternative path to communicate with one another.
ZigBee operates in two main modes: non-beacon mode and beacon mode. Beacon mode the network coordinator will periodically "wake-up”. On the other hand, the non beacon mode the coordinator must always be awake to listen for signals, thus requiring more power. In any case, ZigBee obtains its overall low power consumption because the majority of network devices are able to remain inactive over long periods of time.
ZIGBEE APPLICATIONS:
• Home Entertainment and Control — Smart lighting, advanced temperature control, safety and security, movies and music
• Home Awareness — Water sensors, power sensors, smoke and fire detectors, smart appliances and access sensors
• Mobile Services — m-payment, m-monitoring and control, m-security and access control, m-healthcare and tele-assist
• Commercial Building — Energy monitoring, HVAC, lighting, access control
ZigBee Technology: Wireless Control that Simply Works
ABSTRACT:
Today most wireless industries focus on high data throughput, simple wireless connectivity, relaxed throughput, very low power and an inexpensive device. On the telecom front, numerous wireless technologies have been introduced in the country such as Wi-Fi, Wimax, Bluetooth,etc. Bluetooth is not the end of world. The engineers across the globe are working on solutions that can be customized according to user's needs. ZIGBEE is one such solution.Zigbee is the dominant technology among all other wireless devices because of its low cost, low power consumption, small size, fast and easy deployment.
This presentation involves the detail explanation about what is Zigbee, why we need it, how it works, advantages they offer and their limitations. Also explained are some of the possible that can make possible with it.
Zigbee is designed to provide highly efficient connectivity between small packet devices.Zigbee’s current focus is to define a general-purpose,inexpensive,self organizing mesh network that can be used for embedded sensing, medical data collection and home automation,etc.This keeps Zigbee far ahead from the existing technologies like Wi-Fi,Wimax and Bluetooth,etc.
This paper will outline Zigbee principles with a clear depiction.Additionally the comparision of Zigbee with other wireless devices is also mentioned.
INTRODUCTION:
Zigbee is a rather new wireless technology that looks to have applications in a variety of fields. Zigbee is a technological standard based on the IEEE 802.15.4 specification for low data rates in the Industrial, Scientific, and Medical (ISM) radio bands. The technology allows for devices to communicate with one another with very low power consumption, allowing the devices to run on simple batteries for several years. Zigbee is targeting various forms of automation, as the low data rate communication is ideal for sensors, monitors, and the like.
WHAT IS ZIGBEE?
ZigBee is a technological standard, based on the IEEE 802.15.4 standard, which was created specifically for control and sensor networks. In the Institute of Electrical and Electronics Engineers (IEEE), the 802 group is the section that deals with network operations and technologies. Group 15 works more specifically with wireless networking, and Task Group 4 drafted the 802.15.4 standard for a low data rate wireless personal area network (WPAN).
As can be seen in the figure, IEEE 802.15.4 defined MAC Layer and Physical (PHY) Layer address such things as the frequency and data rate specifications. ZigBee, meanwhile, develops the Network Layer and Application Layer, which includes the Applications Support Sub layer, the ZigBee Device Object, and the Security Services. The Network Layer and Application Layer are more specific than the IEEE layers and involves such things as how a ZigBee network is to be set up, how the devices in the network relate to one another, and so on.
ZIGBEE ARCHITECTURE: There are three different types of Zigbee devices:
5.1.ZigBee coordinator(ZC): The most capable device, the coordinator forms the root of the network tree and might bridge to other networks. There is exactly one ZigBee coordinator in each network since it is the device that started the network originally. It is able to store information about the network, including acting as the Trust Centre & repository for security keys.
5.2.ZigBee Router (ZR): As well as running an application function a router can act as an intermediate router, passing data from other devices.
5.3ZigBee End Device (ZED): Contains just enough functionality to talk to the parent node (either the coordinator or a router); it cannot relay data from other devices. This relationship allows the node to be asleep a significant amount of the time thereby giving long battery life. A ZED requires the least amount of memory, and therefore can be less expensive to manufacture than a ZR or ZC.
HOW ZIGBEE WORKS?
ZigBee basically uses digital radios to allow devices to communicate with one another. Every ZigBee network must contain a network coordinator. Other Full Function Devices (FFD' s) may be found in the network, and these devices support all of the 802.15.4 functions. They can serve as network coordinators, network routers, or as devices that interact with the physical world. The final device found in these networks is the Reduced Function Device (RFD), which usually only serve as devices that interact with the physical world.
The figure above introduces the concept of the ZigBee network topology. Several topologies are supported by ZigBee, including star, mesh, and cluster tree. Star and mesh networking are both shown in the figure above. As can be seen, star topology is most useful when several end devices are located close together so that they can communicate with a single router node. That node can then be a part of a larger mesh network that ultimately communicates with the network coordinator. Mesh networking allows for redundancy in node links, so that if one node goes down, devices can find an alternative path to communicate with one another.
ZigBee operates in two main modes: non-beacon mode and beacon mode. Beacon mode the network coordinator will periodically "wake-up”. On the other hand, the non beacon mode the coordinator must always be awake to listen for signals, thus requiring more power. In any case, ZigBee obtains its overall low power consumption because the majority of network devices are able to remain inactive over long periods of time.
ZIGBEE APPLICATIONS:
• Home Entertainment and Control — Smart lighting, advanced temperature control, safety and security, movies and music
• Home Awareness — Water sensors, power sensors, smoke and fire detectors, smart appliances and access sensors
• Mobile Services — m-payment, m-monitoring and control, m-security and access control, m-healthcare and tele-assist
• Commercial Building — Energy monitoring, HVAC, lighting, access control
