This paper envisions an urban scenario where people carry radio devices that can be dynamically networked, by exploiting human contact opportunities, to create unplanned, improvised and localized wireless connectivity, which has been recently called Pocket Switched Networks (PSN). PSNs are a subclass of Delay Tolerant Networks, but the fascinating idea of considering people as the switching nodes of a mobile network infrastructure is progressively moving the application of DTN from rural, or deep space, to urban scenarios where nodes are more densily distributed, and people contacts are more frequent and dependent on their social relationships. In such a scenario, the design of forwarding protocols is heavily influenced by human mobility, whose understanding has motivated a large amount of researches mainly addressed (i) to the analysis of the distribution of contacts and their duration, (ii) to derive the mobility models, to seamlessly re-create the real patterns of human mobility, and, more recently, (iii) to capture the role of human social attitudes and relationships [5]. This process of understanding and properly reproducing the human mobility is far from fulfilment when densily populated settings (urban locations, workplaces, small campuses) are involved.
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