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In sensor network applications, data gathering mechanisms, which are based on multi-hop forwarding, can be expensive in terms of energy. This limitation challenges the use of sensor networks for applications that demand a predefined operational-lifetime. To avoid this problem, using of mobile element (ME) as a mechanical data carrier has emerged as a promising approach. However, practical considerations...
Nodes in a Wireless Sensor Network (WSN) are usually powered by battery. In a WSN with multi-hop communications, some routing algorithms place heavy burden of forwarding packets on nodes close to a base station, causing these nodes to drain more battery energy and die earlier than others so that lifetime of the WSN is shortened. To solve the un even energy expenditure among nodes, we present a novel...
In this paper we propose a clustering and routing scheme for wireless sensor networks based on a self-organizing approach. The aim of this approach is for nodes to perform an integrated emergent task (data gathering and reporting to the sink) by simply following rules based on their individual local environment. Clusterhead election is also performed in a distributed manner and is based on sensors...
For wireless sensor networks (WSNs), how to design routing protocols is very important to gather data efficiently so that the life of the network can be prolonged. A usual concept to collect data by a sink node is to transfer data from sensor nodes to the sink node by multihop. However, it gives rise to two problems. The first one is that core sensor nodes being more frequently used to gather data...
Summary form only given. A quorum system is formed by organizing nodes into subsets called quorums, where every two quorums intersect and no quorum includes another quorum. The quorum system reduces the access cost per operation, to balance the load, and to improve the system scalability. All of these properties make quorum systems particularly attractive for large-scale sensor applications involving...
Top-k queries are important to many wireless sensor applications. Conventional Top-k query processing algorithms install a filter at each sensor node and suppress unnecessary sensor updates. However, they have some drawbacks that the sensor nodes consume energy extremely to probe sensor reading or update filters. Especially, it becomes worse, when the variation ratio of top-k result is higher. In...
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