I went down to Washington D.C. to interview Vint Cerf a few weeks ago and he laid an interesting surprise on me: space communications technology may soon be coming to Android cellphones. Cerf, a Google vice-president and one of the founding fathers of the internet, is currently helping NASA test a delay-tolerant network (DTN) that will greatly improve the efficiency of space-to-Earth communications. (It's part of the fabled "Intergalactic Internet.")
Space-to-Earth communications are currently reliant on complicated schedules - satellites, shuttles and other sensors can only relay information back to the ground during specific connection windows, when they are passing over antennae nodes on the ground. The new DTN will make it possible for satellites and the rest to use a sort of store-and-forward system, where they'll bypass the need to make a direct connection with the ground. Instead, it'll work kind of like a BlackBerry - if you type out an e-mail but don't have cell coverage, the device will store it until it establishes a connection, then send it.
U.S. military tests of a ground-based version of DTN have gone "fantastically well," Cerf said, so we could easily see the technology applied to cellphones running Google's Android operating system to deliver "content-directed routing." Example: one Android phone downloads some map data, then radiates it out to other nearby phones, thus saving those other users having to download the info themselves from the cell network. Cerf said the application could be particularly useful in health care, to establish Star Trek-like tricorders. "We're not very far away from stuff like that," he said. "I don't think it's going to take till 2400."
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