The reliability of wireless sensor networks is affected by faults that may occur due to various reasons. In ZigBee sensor networks, ZigBee specification presents a self-healing process which relies on its tree topology. When a ZigBee node failed, all of the descendants of the fault node should rejoin the network. Instead, we present an efficient scheme for repair itself after node failure that just one or some of the descendants should rejoin the network. It allows a subnet of fault node rejoin the network with minimum message exchanges and, therefore, saves energy. Simulation results show that most of subnet rejoin the network in the first level of sub-tree, and confirm the efficiency of the proposed scheme.
In Wireless Sensor networks (WSNs), most existing routing protocols do not consider a node mobility problem, because nodes in sensor network are generally assumed to be static.The network may get partitioned, due to the mobility of some nodes will cause other nodes to lose their connection with the network. Network partitioning poses significant challenges to the provisioning of continuous data streaming services in WSNs. In this paper, we propose a routing scheme which supports node Mobility and Energy-Efficient based on Directed Diffusion(MEDD) for WSNs. In MEDD, we design a gradient model which considers energy consumption balance and real-time requirement. Based on this, we mainly propose a mechanism which makes node be able to localize the gradient reconfiguration whenever its movement occurs. It ensures the robustness of network transmission. Simulation results show that our proposed method decreases the network overhead and prolongs the lifetime of network efficiently.
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