ZigBee is a wireless personal area network, which is a world wide standard targeted to low-power, cost-effective, reliable, and scalable products and applications. In data communication networks, one of the most important functions is routing among the nodes. ZigBee standard supports a combination of tree routing and on-demand vector routing. An on-demand routing protocol needs more processing and memory resources, which is the main constraint in the low power wireless sensor networks. Also, the on-demand routing protocols are based on the route discovery, a process which increases the initial latency. On the other side, in hierarchical tree routing, each node sends data to the child nodes or parent node by using parent-child links without using routing table and without using path searching and updating. Therefore, tree routing is simple and uses the resources more efficiently. These features make tree routing suitable for networks consisting of small-memory, low-complexity lightweight nodes and low-power. The study involves various routing techniques in ZigBee wireless networks.
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