May be developed for delay tolerant applications. WirelessHART and ZigBee share same standard (802.15.4) and one of is for real time communication and other isn't.
I wish it will be helpful
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http://www2.ece.gatech.edu/academic/courses/ece4007/11spring/ECE4007L04/da2/ECE4007TRP_Sheng.pdf
Wireless Automotive Communications
Thomas Nolte and Hans Hansson
MRTC, Department of Computer Science
and Electronics
M¨alardalen University
V¨aster°as, SWEDEN
Lucia Lo Bello
RETISNET Lab, Department of Computer
Engineering and Telecommunications
University of Catania
Catania, ITALY
http://ant.comm.ccu.edu.tw/course/97_ITS/1_HW1/0.Wireless%20Automotive%20Communications.pdf
Regards...
Perhaps one of the impediments in realizing real time data communication with ZigBee is the lack of superior data rate support. ZigBee only supports data rate up to 250Kbps.
ZigBee is a wireless technology developed as an open global standard to address the unique needs of low-cost, low-power wireless M2M networks. The ZigBee standard operates on the IEEE 802.15.4 physical radio specification and operates in unlicensed bands including 2.4 GHz, 900 MHz and 868 MHz.
The 802.15.4 specification upon which the ZigBee stack operates gained ratification by the Institute of Electrical and Electronics Engineers (IEEE) in 2003. The specification is a packet-based radio protocol intended for low-cost, battery-operated devices. The protocol allows devices to communicate in a variety of network topologies and can have battery life lasting several years.
The ZigBee protocol has been created and ratified by member companies of the ZigBee Alliance. Over 300 leading semiconductor manufacturers, technology firms, OEMs and service companies comprise the ZigBee Alliance membership. The ZigBee protocol was designed to provide an easy-to-use wireless data solution characterized by secure, reliable wireless network architectures.
Zigbee is bidirectional wireless communication technology of short distance, low
complexity, low cost, low power consumption, and low data
rate, mainly used in automatic control.
it provides data integrity check and authentication, and uses AES-128 security algorithm. Each application has the flexibility to determine its safety properties
It uses collision avoidance mechanism, and at the same time it reserves a dedicated time slot to require a fixed bandwidth of the communication service, avoid the competition and conflicts when data is sent.
for short delays : enhanced communication delays for delay-sensitive applications. Communication delay and sleep wake up time delay are very short. Typical device
search delay is 30ms, typical sleep-wake up time delay is 15ms, and active channel access delay is 15ms.
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