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The first DARPA experiment with wireless mobile Internet - the Packet Radio Network or PRNET - was completely independent of the infrastructure. This model was consistent with DARPA military goals as the PRNET was designed to support tactical operations far away from any wired infrastructure. Beside autonomy, the main challenge was mobility and radio portability. Scarcity of spectrum was not an issue, in contrast with the ARPANET quest to utilize those 50 kbps Telpak trunks more efficiently. Today, the closest civilian descendents of the PRNET are vehicular networks and smart phone based Personal Area Networks.
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