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A sensor network consists of a large number of sensor nodes which have sensing functions and wireless communication functions, and a single sink node which is a base station node of the sensor network. Sensor nodes sense some environmental phenomena and send data packets about the phenomena to the sink node by multi-hop communications. Generally sensor nodes are battery-driven. Therefore shortening...
For multicast applications with large-scale groups in large-scale wireless sensor networks, it is an important issue for energy saving in geographic multicasting both to obtain location information of destination nodes and to construct the geographic multicast tree efficiently. To address this issue, there have been proposed global search based hierarchical geographic multicasting protocols. Such...
The research in wireless sensor networks (WSNs)has attracted a lot of attention in recent years. Sensor nodes are often placed in a hostile or dangerous environment where they are not physically protected. Hence, sensor nodes must self-organizationally form a connected network. Additionally,Energy is a decisive resource in WSNs. So the trade-off between connectivity and power control becomes a critical...
In this paper, we propose a novel localization algorithm in Wireless Sensor Network. The proposed method is a kind of range-free localization algorithm which only uses the proximity information between sensor nodes. In the proposed method, a robust weighted algorithm is presented to calculate the average hop distances between sensor nodes and anchor nodes. The proposed method is applied to an isotropic...
Localization is an important research issue in Wireless Sensor Networks (WSNs). Recently, hop-count-based localization has been proposed as a cost-effective alternative to range-based localization algorithms. Traditionally, hop-counts between any pair of nodes can only take on integer values regardless of relative positions of nodes in the hop. We show that by partitioning a node's one-hop neighbor...
Wireless sensor networks are used in many applications like battlefield, patient monitoring, emergence response information and environmental monitoring. To achieve security in WSN, it is important to be able to encrypt the messages sent between sensor nodes. It is required to agree upon a common key before encrypting the messages. The key management task is challenging due to resource constrained...
Recent advances in wireless sensor networks have led to many new routing protocols specifically designed for sensor networks where energy awareness is an essential consideration. At first, this paper gives a short overview of recent routing protocols for sensor networks and presents a classification for the various approaches. The four main categories explored in this paper are data-centric, hierarchical,...
Hybrid sensor networks comprise of mobile and static sensor nodes setup for the purpose of collaboratively performing tasks like sensing a phenomenon or monitoring a region. In this paper, we present a novel approach for navigating a mobile sensor node (MSN) through such a hybrid sensor network. The static sensor nodes in the sensor network guide the MSN to the phenomenon. One or more MSN's are selected...
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