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We consider the online data gathering problem in wireless sensor networks and examine the key issues of load balancing the nodes to achieve longer network lifetime, and that of load balancing the network links to achieve greater reliability in the network. We model the given network as a shortest-path DAG D, which defines a set of parent nodes for each node that determine the minimum-hops paths from...
Wireless Sensor Networks (WSNs) consist of a large number of small and low cost sensor nodes powered by small batteries and equipped with various sensing devices. Usually, for many applications, once a WSN is deployed, probably in an inhospitable terrain, it is expected to gather the required data for quite some time, say for years. Since each sensor node has limited energy, these nodes are usually...
The multi-hop routing protocol LEPS in TinyOS has some disadvantages: communication quality can not be guaranteed; and the topology changes frequently. This paper presents an improved multi-hop routing protocol based on LEPS, called I-LEPS. I-LEPS simultaneously considers hop count to the sink node and link quality in parent choosing, and dynamically adjusts network topology according to node energy...
Design an energy efficient routing protocol for wireless sensor network is a very important issue because of the constrained energy of sensor nodes. In this paper, an energy efficient routing protocol (VBT-EBHRP) is proposed. In this protocol, a virtual backbone tree is constructed and based on the virtual backbone tree, a routing tree is constructed. The residual energies of the virtual backbone...
Geographic routing has been considered as an efficient, simple, and scalable routing protocol for wireless sensor networks since it exploits pure location information instead of global topology information to route data packets. Geographic routing requires the source nodes to be aware of the location of the sink nodes. How source nodes efficiently obtain the sink location information has been merely...
Deployed in a harsh oceanic environment for mission critical tasks, underwater acoustic networks have been regarded as a special type of wireless sensor networks. The limited bandwidth and power resources as well as the 3-D topology in such networks have made the geographic routing a favorite choice. In underwater sensor networks environment, most of the detouring strategies of the existing geographic...
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