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Zigbee and bluetooth

发布时间:2017-03-27
该论文是我们的学员投稿,并非我们专家级的写作水平!如果你有论文作业写作指导需求请联系我们的客服人员 Differences between Zigbee & Bluetooth Technologies:

Zigbee and Bluetooth are two different technologies with applications and means of designing for those(Zigbee & Bluetooth) applications. For a start, Zigbee focuses on remote control applications and automation, while Bluetooth focuses on connectivity between other peripheral such as laptops, PDA's, Blackberry and other general cable replacement.

Zigbee uses a lower data rate, power consumption and works with smaller packet size. Furthermore, a Zigbee network is capable of supporting a larger number of devices and a longer range between those devices (starting from 10 meters up to 40 meters indoors and 120 meters outdoors). On the other hand, Bluetooth uses a higher data rate, power consumption and works with larger packet devices. Also, its' network capability is less than the Zigbee; where it supports less number of devices (up to 8 nodes only) and a shorter range between devices.

As a result of such differences, both technologies use different applications and don't have the capability to extend to other technologies. For example, Bluetooth rely on the recharging batteries fairly frequently, while Zigbee's aim is to allow the user to put a couple of batteries in the devices and simply leave them; since they can last for months to years.

Speaking of time, Zigbee is designed to respond faster, while Bluetooth takes a longer time and may damage (can be disadvantageous) the application, since these lines are the power pins for the 1-Wire adapter[1]. Finally, both technologies can be easily used as a wireless solution in a PAN to suit all types of applications within that network. [2]

ZigBee lacks the bandwidth of other wireless technologies, but uses less power and enables far more devices to be networked[3]

In addition, Zigbee protocol defines a type of sensor network for residential and commercial applications. For example, heating, air conditioning and lighting control. It combines IEEE 802.15.4, which defines the physical and MAC layers, while the network, security and application layers are specified by the ZigBee Alliance, a consortium of technology companies.

Meanwhile, Bluetooth eliminates cabling between electronic products and accessories. For example, it eliminates cabling between computers and printers, or between phones and headsets. Bluetooth users with handhelds or laptops can exchange files, business cards and calendar appointments. Bluetooth is more oriented toward user mobility and eliminating short-distance cabling; ZigBee aims more for grand-scale automation and remote control. [4]

In terms of Antenna and Hardware, Zigbee requires its own hardware and antenna; while Bluetooth doesn't need additional hardware, one antenna is enough. As for the battery life and power, Zigbee offers 30mW compared to Bluetooth which is 100mW.

As we compared earlier in the previous table, Zigbee has a longer battery life. It is designed to run for six months to two years using two AA batteries. However, Bluetooth must be alert for a faster response time, resulting to a few days life of battery. This is because Bluetooth devices takes about 3 seconds to wake up from a sleep, while Zigbee nodes can wake up in about 15 msec. This difference in wake-up time makes Bluetooth's response time larger than that of a zigbee node; therefore, a Bluetooth device must not sleep often and should always be alerted for data transmissions. In addition, the range in Zigbee can reached up to 75m maximum, while the Bluetooth is only ups to 10m. However, Bluetooth 2.1 can reach up to 30m.

The prices differ as well, during the year 2003 Zigbee targeted a cost of $2, while the Bluetooth was $5 per device. Currently, Zigbee is still $2 but, Bluetooth has dropped to $3.

The network topologies in "Bluetooth operate primarily in ad hoc piconets, where a master device controls multiple slaves. These piconets are limited to 8 devices. ZigBee has far greater flexibility in this arena, supporting mesh and star configurations [4]. Mesh networks offer resilience against severed connections, as Coordinator devices can re-route traffic as needed. Star configurations at the ends of the mesh allow clusters of ZigBee devices to interact with the outside world, while the mesh devices focus on data transmission."[5] Finally, in Time to Wake and Transit "one of ZigBee's greatest strengths over Bluetooth has been its freedom to sleep often. This comes from its quick wake-from-sleep design. A ZigBee device "can wake up and get a packet across a network connection in around 15 milliseconds," while a Bluetooth device would take 3 seconds." [5]

Similarities between Zigbee & Bluetooth Technologies:
  • Both are types of IEEE 802.15 "wireless personal-area networks," or WPANs
  • Run in the 2.4-GHz unlicensed frequency band
  • Use small form factors and low power
  • Both technologies support state-of-the-art 128-bit encryption, and continue to be scrutinized for key distribution vulnerabilities and the like. [5]

References:

  1. C.Contreras. (2010). Bluetooth to 1-Wire® communication using the DS9097U Available [Online]: http://www.maxim-ic.com/app-notes/index.mvp/id/4633 , 2010.
  2. C.I Diamond. (2005). Zigbee vs. Bluetooth. Available [Online]: http://homepage.uab.edu/cdiamond/ZigBee%20vs%20Bluetooth.htm , 2010.
  3. J. Wexler. (2005). Bluetooth and Zigbee:Their similarities and differences. Available [Online]: http://www.stevenswater.com/telemetry_com/bluetooth_zigbee_info.aspx , 2010.
  4. J. Wexler. (2005). Bluetooth and Zigbee:Their similarities and differences. Available [Online]: http://www.computerworld.com.au/article/133309/bluetooth_zigbee_their_similarities_differences/ , 2010.
  5. J. Kooker. (2008). Bluetooth, ZigBee, and Wibree: A Comparison of WPAN Technologies. Available [Online]: http://cseweb.ucsd.edu/classes/fa08/cse237a/topicresearch/jkooker_tr_report.pdf , 2010.

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