वहत इस सेंसर networking

In December 2004, the OSU DARPA-NEST team headed by Anish Arora completed the first demonstration and experiments of ExScal. This demonstration covered an area 1.3km by 300m with about 1000 sensor nodes and around 200 backbone nodes making it the largest wireless sensor network assembled to date. ExScal's demonstration is also the largest ad hoc 802.11 network thus far created.

It is widely believed that someday there will be sensor network deployments of hundreds of thousands of nodes. The challenges in scaling to networks of this size are quite different than the ones encountered in fielding much smaller networks of dozens or hundreds of nodes. The former subsumes the latter and add a host of new problems. The motivation for the DARPA Extreme Scaling project, code-named "ExScal," was to investigate the challenges in scaling to a network of 10,000 sensor nodes. While 10,000 nodes is still a fraction of "hundreds of thousands," we have encountered many of the basic challenges of extreme scaling that we believe will be encountered with larger numbers of nodes. Consequently, the ExScal project has provided us with a rich set of experiences and has given us a visceral understanding of the "real" problems that are posed by networks of extreme scale.