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One of the widespread types of crime is child kidnapping where the number of cases is increasing each year. With the modern telecommunication technology, the child protection should be better now than before. This paper presents a preliminary study on routing protocol for child tracking using combined infrastructure of Wireless Sensor Network and Cellular Network. The real-time application in these...
Data aggregation is an important issue in wireless sensor networks which gathers and routes information through a multi-hop network and processes data at intermediate nodes. This paper considers how to construct data aggregation tree in wireless sensor network where there are several source nodes and a single sink. Ant Colony Optimization algorithm is an effective distributed approach. It has been...
In wireless sensor networks constructed from battery driven nodes, it is difficult to supply electric power to the nodes. Because of this, the power consumption must be reduced. To cope with this problem, clustering techniques have been proposed. EACLE is a method that uses a clustering technique. In EACLE, the route selection is executed independently after the CH (Cluster Head) selection. These...
Because of the dominating many-to-one communication pattern, traffic load is not evenly distributed over the nodes in a wireless sensor network (WSN). In a large-scale WSN, the multi-hop routing even deteriorates this traffic load imbalance by accumulating traffic flows along their paths to the sink. Understanding the traffic load distribution can guide the network-wide energy allocation, direct the...
Structural monitoring is the collection and analysis of structural response to ambient or forced excitation. One key issue in such monitoring is data aggregation. The sensors are typically sampled at high frequencies, producing large amounts of data; limited network resources make acquiring and processing this data quite challenging. In this paper, we propose an novel data aggregation scheme in WSNs...
Traffic load is not evenly distributed over the nodes in a wireless sensor network (WSN). Understanding the traffic load distribution can guide the network-wide energy allocation, direct the design of routing algorithms, and optimize the node deployment in WSNs. In this paper, we consider a dense WSN with nodes uniformly distributed in a disk sensing area, and find the traffic load distribution over...
In a wireless sensor network (WSN), interesting events are reported to the sink by the sensors in a distributed manner. Applications running at the sink require certain reliability in terms of events per unit time to be able to run satisfactorily. Individual report from sensor nodes is not important, but collective reports from sensor nodes of a region of interest of an application are crucial. Thus,...
Sensors have a function to gather environmental data in sensor networks. They operate by limited, small-size battery depending on applications. Thus there are several kinds of research efforts to make better use of local energy. In this paper, we propose multi-attribute query processing algorithm (Section Bit based scheme (SB)). In the initial setup, routing path is determined based on parent-child...
In general, data communication among sensor nodes requires more energy than internal processing or sensing activities. In this paper, we propose a noble technique to reduce the number of packet transmissions necessary for query dissemination or query results relaying processes among neighboring nodes with the help of context-aware routing tables. The important information maintained in the context-aware...
The MAC based on competition doesn't do any contribution in the energy savings, because it will lead to conflict, crosstalk, idle intercept and control expenses in communication. TDMA scheduling system based on the structure of cluster can effectively improve the scalability, save energy and does not increase node costs, but it also brought transmission interference between clusters. We proposed an...
The feature of 6LoWPAN is the capability of the dynamic assignment of 16bit short addresses. By using this dynamically assigned short address, a hierarchical routing is employed. In case of node failure, this hierarchical routing does not support a technique for path recovery. So, this paper proposes the path recovery technique for hierarchical routing over 6LoWPAN.
In wireless sensor networks (WSNs), a challenging problem is how to advance network QoS. Energy-efficiency, network communication traffic and failure-tolerance, these important factors of QoS are closely related with the applied performance of WSNs. Hence a QoS-aware routing protocol called directed alternative spanning tree (DAST) is proposed to balance the above three factors of QoS. A directed...
A sensor, actuator, and device network (SADN) is composed of sensor, actuator, and device nodes. Sensor nodes sense physical events and send sensed values of the events to actuator nodes. Actuator nodes decide on proper actions on receipt of sensed values and then issue requests of the actions to the device nodes. We propose an SADN model where sensor, actuator, and device functions are replicated...
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