{"id":5244,"date":"2022-05-22T18:05:00","date_gmt":"2022-05-22T10:05:00","guid":{"rendered":"https:\/\/store.west-hn.com\/?p=5244"},"modified":"2024-05-16T16:11:43","modified_gmt":"2024-05-16T08:11:43","slug":"indoor-positioning-technology-zigbee","status":"publish","type":"post","link":"https:\/\/store.west-hn.com\/en\/indoor-positioning-technology-zigbee\/","title":{"rendered":"Indoor Positioning Technology] - ZigBee Technology"},"content":{"rendered":"

summarize<\/h2>
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ZigBee, also known as Purple Bee (based on the way bees connect with each other, bees fly through the Zig-Zag to notify the location of food found, distance and direction and other information), is a low-speed, short-range transmission of wireless network protocols, the bottom is the use of the IEEE 802.15.4 standard specification of the media access layer and the physical layer. The main features are low speed, low power consumption, low cost, support for a large number of network nodes, support for a variety of network topologies, low complexity, reliability and security.<\/p>

Developed by the ZigBee Alliance, a group of Honeywell companies, it has been in development since 1998, and in 2001 was introduced to theInstitute of Electrical and Electronic Engineers<\/a>(IEEE)<\/a>proposal into the IEEE 802.15.4 standard specification.IEEE802.15.4<\/a>The agreement isIEEE802.15.4<\/a>The Working Group for Low-Rate Wireless Personal Area Network (WPAN: Wireless Personal Area Network) was formed in December 2002 to define an inexpensive, low-complexity, low-cost, low-power, low-rate wireless connectivity technology for fixed, portable, or mobile devices, and in December 2003 it The first 802.15.4 standard was adopted. With the development of wireless sensor network technology, wireless sensor network standards have also been rapid development. 802.15.4 standard defines the way in the personal area network through the radio frequency mode in the interconnection between the device and the protocol, the standard uses to avoid the conflict of the carrier listening to the multi-access access to the way as a media access mechanism, and at the same time to support the star and peer-to-peer type topology.<\/p>

Two physical frequency bands and Direct Sequence Spread Spectrum (DSSS) physical layer bands are specified in the 802.15.4 standard: 868\/915 MHz and 2.4 GHz.The 2.4 GHz physical layer supports a rate of 250 kilobits per second (kb\/s) over the air, whereas the 868\/915 MHz physical layer supports transmission rates of 20 kb\/s and 40 kb\/s over the air. The actual data throughput will be less than the specified bit rate due to packet overhead and processing delays. As a protocol standard to support low-rate, low-power, and short-range wireless communications, 802.15.4 specifies the radio frequency and data rate, data transmission model, device type, network operating mode, and security. And the protocol model is divided into two sub-layers, the physical layer and the media access control layer for implementation<\/p>

ZigBee Operating Frequency Bands<\/h2>

Channel 0: 868 MHz (Europe)
Channels 1-10: 915 MHz (United States and Australia)
Channels 11-26: 2.4 GHz (worldwide)<\/p>

ZigBee Network Topology<\/h2>

star topology
grid topology
tree topology<\/p>

\"zigbee\"<\/figure>

ZigBee Network Architecture<\/h2>

Zigbee architecture is a combination of 6 layers, which are application layer (belongs to the user level program), application interface layer, security layer, network layer, access control layer, and physical layer; in which the application layer is the user's program, the application interface, security layer, and network layer Zigbee Alliance's are used for storing the data, the access control layer and the physical layer is the IEEE 802.15.4; which is the hardware protocol for the physical layer.<\/p>

Features of the ZigBee standard<\/h3>