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Opportunistic networking, where node mobility is utilized to achieve message delivery, has become an important class of mobile ad hoc networking. A critical component of performance analysis for opportunistic networking is a basic understanding of contact and inter-contact times for commonly studied mobility models. In this paper the authors give original results nodal contact-times and analytically show that inter-contact times of mobile nodes can be closely approximated as exponentially distributed in Random Waypoint and Random Direction mobility models.
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