Scalable Ubiquitous Data Access in Clustered Sensor Networks

Wireless sensor networks have drawn much attention due to their ability to monitor ecosystems and wildlife habitats. In such systems, the data should be intelligently collected to avoid human intervention. For this, the authors propose a network infrastructure in which the sensor nodes are designated as "Data-generating" or "Data-storage" nodes. Data-generating nodes take measurements, whereas data-storage nodes make themselves available to compute and store checksums of data received from nearby data-generating nodes. They propose a spatially-clustered architecture for their storage nodes and a coding scheme that allows a data collector to recover all original data by querying only a small random subset of storage nodes from each cluster.