Learn More
The ZigBee standard which has been widely adopted for wireless sensor networks specifies two routing protocols. One is a path search protocol which finds the best path by flooding whole or part of the network with path search messages costing significant amount of energy and bandwidth. The other is a simple tree routing protocol which eliminates path search(More)
Self-healing is an important feature of robust and reliable wireless sensor networks. ZigBee is an industrial standard widely adopted for wireless sensor networks. We propose an efficient process for a ZigBee network to repair itself after node failure or communication breakdown. It allows a disconnected subnet to rejoin the network with minimum message(More)
In clustered wireless sensor networks, cluster-heads (CHs) are the key. And the CH selection methods can affect the efficiency of the cluster and even influence the lifetime of an energy-constrained network. In this paper, we propose the Energy-consumption-cycle based Cluster-heads Selection (ECHS) protocol. ECHS selects CHs via two phases. In the first(More)
We investigate the performance of IEEE 802.15.4 MAC (Medium Access Control) sublayer in beacon-enabled tree-topologyWireless Sensor Networks (WSNs). To our knowledge, current literature has mostly focused on relatively simpler star topology or non-beacon-enabled peer-to-peer networks. In our work, we first respectively evaluate the impact of different(More)