Abstract: Wireless sensor network (WSN) is a multi-hop and self-organizing network composed of a large number of micro-sensor nodes deployed in the monitoring area through wireless communication.Distributed environment awareness and simple and flexible deployment make WSN become an important factor affecting our daily life.With the continuous development of micro-electronics and communication technology,WSN has been widely used in national defense,military,environmental monitoring,medical health,smart home and industrial manufacturing.ZigBee is a global standard for wireless personal area networks that support low-rate transmission,low power consumption,security and reliability for available products and applications.Different from the other wireless personal area network standard such as Bluetooth,Wi-Fi,ZigBee provides the low power wireless tree and mesh networking,and supports up to thousands of wireless sensor devices in a network.There exist isolated nodes in the Distributed Address Assignment Mechanism of ZigBee technology,which results in unavailable of idle address and waste of resources.To solve this problem,a novel tree-based Address Assignment Algorithm for Tree Network (AAN) is proposed in this paper.This algorithm can decrease the idle address space and the number of isolated nodes in the network,optimize the network topology,and reduce the time and storage space needed to establish and maintain the routing table.Simulation experiment results show that our algorithm is more advantage than DAAM and one of its present improvements in terms of the success rate of address assignment,number of isolated nodes,and network depth.

Key words: Address assignment, DAAM, Tree network, Wireless sensor network, ZigBee