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Most disruption-tolerant networking protocols available have focused on mere contact and inter-contact characteristics to make forwarding decisions. The authors propose to relax such a simplistic approach and include multi-hop opportunities by annexing a node's vicinity to its network vision. They investigate how the vicinity of a node evolves through time and whether such information is useful when routing data. By analyzing a modified version of the pure WAIT forwarding strategy, they observe a clear tradeoff between routing performance and cost for monitoring the neighborhood. By observing a vicinity-aware WAIT strategy, they emphasize how the pure WAIT misses interesting end-to-end transmission opportunities through nearby nodes.
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