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1. M. S. Desta, E. Hyytiä, J. Ott and J. Kangasharju, Characterizing Content Sharing Properties for Mobile Users in Open City Squares, in In Proc. of WONS'13, 2013 (bib)

   Abstract: For mobile delay-tolerant networks, researchers have utilized different mobility models to assess the performance of routing algorithms or applications. Substantial research has gone into understanding and modeling the contact characteristics of mobile users to allow evaluation under conditions that approximate the real world as closely as possible. One important finding of recent years has been recognizing that contacts humans at a macroscopic level derive from daily routines and social interactions so that analyzing social network structures can assist in determining, e.g., which peers would be suitable for forwarding a message towards a certain destination. However, while mid- to long-term social interaction patterns may assist in delivering messages at larger scales, such patterns become immaterial when considering a microscopic perspective, such as an intersection or a large square in a city and when we consider content sharing in a region rather point-to-point messaging. When considering microscopic scales, we face an ``open'' simulation area in which nodes enter and leave rather than a closed system in which nodes do not disappear. Moreover, small scales show more dynamics (e.g., in terms of node density) so that steady state analysis becomes insufficient since such a state may not be reached in the system. In this paper, we investigate the operation of a content sharing application, Floating Content, under such microscopic mobility conditions and characterize its behavior for city squares. For its validation, we derive a mobility model for open squares to which mobile nodes enter and from which they depart.