A Solution of Orphan Problem in ZigBee Tree Network

In order to solve the problem that the coverage area of ZigBee tree network is restricted by the depth, so that new nodes can not join the network and become a orphan, this paper introduces a project of expanding network coverage area. In this project, through the manual of the button, we can choose a qualified end device to convert to the router configuration, then the device as a router receives new nodes to join the network, The requirement would be realized by improving and innovating ZigBee protocol stack. The project works well in the experiment, it saves the device energy and expands the scope of network.