uTupleSpace: A Bi-Directional Shared Data Space for Wide-Area Sensor Network

A sensor network covering a large area enables connection to various types of sensors and actuators, but application development becomes complicated because of the uncontrollable behavior of such a large number of devices. We propose the u Tuple Space model for uniform and indirect communication with two extensions to the original tuple space model. The extensions enable efficient range search for multi-dimensional keys and bi-directional communications. Our implementation of our proposed model also integrates load balancing by using a distributed hash table, and the experimental results indicate good scalability in multiple servers. The trial application of gathering and plotting GPS sensor data works well in the field.