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In this paper, we propose a TDMA slot assignment protocol that assigns slots to sensor nodes according to the skew of traffic load. Our protocol prevents the appearance of unassigned slots and utilize the channel effectively by adopting our previous slot assignment protocol that dynamically changes the frame length of each node. In addition, each node exchanges the information on traffic load with...
In recent years, there has been an increasing interest in sensor networks, in which sensor nodes such as temperature or humidity sensors communicate with each other for environmental monitoring and so on. In sensor networks, it is important to reduce the energy consumption, since sensor nodes have limits in battery. Most researches achieve this by reducing sensor amount of transmitted data. However,...
In this paper, we present the results of performance evaluation of our energy-efficient data transmission reduction method in wireless sensor networks (WSNs). In our method, each node in a WSN autonomously determines whether its own reading is redundant or not by using the overheard packets transmitted by its neighbors. The redundancy of a reading is evaluated by a simple spatial interpolation using...
This paper introduces a new sensor network testbed, X-sensor, that integrates multiple sensor networks deployed at different sites. X-sensor provides three functionalities: (a) a sensor network search which enables users to find a sensor networks appropriate for experiment and data acquisition, (b) a sensor data archive which provides users with various sensor data acquired by sensor nodes, and (c)...
In this paper, we propose a novel energy-efficient data transmission reduction method for periodical data gathering in wireless sensor networks (WSNs). Our method exploits overhearing, which is a typical characteristic of wireless communications. In our method, each node in a WSN autonomously determines whether its own reading is redundant or not by using the overheard packets transmitted by its neighbors...
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