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Outline

Title
Abstract
Introduction
Data Classification in a WSN
Limitations of Flash Memory
Data-Centric Middlewares
Conclusions
Acknowledgements
References
All Topics
Engineering
Electronic, Optical and Magnetic Materials

Survey of the State-of-the-Art in Flash-based Sensor Nodes

Profile image of Soledad DíazSoledad Díaz

2011, Flash Memories

https://doi.org/10.5772/19407
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27 pages

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Abstract

A wireless sensor network (WSN) is a distributed system composed of many battery-powered devices, which operate with no human intervention for long periods of time. These devices are called sensor nodes or motes. Motes present features of both embedded and general-purpose systems (Han et al., 2005). Their tiny size, scarce resources, and their autonomous nature lead to strong restrictions of computation, communication, power, and storage. Typically, they are deployed in an ad-hoc fashion over a geographical area (e.g. a volcano, a glacier, an office), which is to be monitored. This means that-depending on the environment where they are installed-it could result very difficult to perform activities of maintenance such as the replacement of the node's batteries. Software built for the sensor nodes must be reliable and robust due to the difficulty for accessing sensor nodes, and sensor nodes must operate in an autonomous way even in presence of failures. Motes are interconnected through wireless links and they execute a simple, small application, which is developed using a sensor node-specific operating system. Typically, sensor network applications consist of sensing the environment through different type of sensors (e.g. temperature, humidity, GPS, imagers), transforming analogical data into digital data in the node itself, and forwarding the data to the network. Data is forwarded through a multi-hop protocol to a special node denominated gateway, which is intended to redirect all data from the wireless network to a base station (e.g. PC, laptop), where the data will be permanently stored in order to allow data post-processing and analysis. Figure 1 shows the three elements previously described: sensor nodes, gateway, base station. 1.1 Data classification in a WSN WSNs generate larger data sets as sampling frequency increase. Sensor nodes must manage data proceeding from different sources: internal data produced by the sensor node itself (e.g. sensor measurements, application data, logs), and external data transmitted by other nodes in the network (e.g. protocol messages, data packets, commands). Since the data

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