ZigBee tree routing is widely applied to low-cost, low-power and low-rate communication fields because it operates without route discovery overhead. However, there exist hop redundancy and traffic concentration due to the limitation of tree topology. This paper proposes two tree routing strategies, i.e., enhanced neighbor tree routing (ENTR) and neighbor hierarchical tree routing (NHTR), by taking into account neighbor relationships among tree nodes. To be specific, ENTR gets the shortcut by establishing the 2-hop neighbor table and the virtual destination neighbor group; while NHTR focuses on the path efficiency of ZigBee tree routing by inserting the initial exploration mechanism and extending the neighbor information in the neighbor table. The simulation results suggest that both ENTR and NHTR can effectively reduce the number of routing hops and achieve smaller end-to-end delay during routing.
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