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@Inproceedings { 2010-heer-pisa-sa,
   title = {PiSA-SA: Municipal Wi-Fi Based on Wi-Fi Sharing},
   year = {2010},
   month = {8},
   day = {2},
   volume = {1},
   pages = {588-593},
   abstract = {With the goal of providing ubiquitous wireless services (e.g., tourist guides, environmental information, pedestrian navigation), municipal wireless networks are currently being established all around the world. For municipalities, it is often challenging to achieve the bandwidth and coverage that is necessary for many of the envisioned network services. At the same time, Wi-Fi-sharing communities achieve high bandwidth and good coverage at a very low cost by capitalizing on the dense deployment of private access points in urban areas. However, from a technical, conceptual, and security perspective, Wi-Fi sharing community networks resemble a patchwork of heterogeneous networks instead of one well-planned city-wide network. This patchwork character stands in stark contrast to a uniform, secure platform for public and commercial services desirable for the economic success of such a network. Hence, despite its cost-efficiency, the community-based approach cannot be adopted by municipalities easily. In this paper, we show how to realize municipal wireless services on top of a Wi-Fi-sharing infrastructure in a technically sound and economically attractive fashion. In particular, we focus on how to securely provide services to mobile clients with and without client-side software support. Our solution cleanly separates the roles of controlling and administering the network from providing bandwidth and wireless access. With this separation, commercial ISPs and citizens with their private Wi-Fi can contribute to the network infrastructure. This allows municipalities in turn to focus their resources on municipal wireless services.},
   tags = {mobile_access},
   url = {http://www.comsys.rwth-aachen.de/fileadmin/papers/2010/2010-heer-icc-pisa-sa.pdf},
   misc2 = {Print},
   publisher = {IEEE Press},
   address = {Washington, DC, USA},
   booktitle = {International Conference on Computer Communication Networks, ICCCN 2010, Zurich},
   event_place = {Zurich, Switzerland},
   event_name = {International Conference on Computer Communication Networks, ICCCN 2010},
   language = {en},
   ISBN = {978-1-4244-7114-0},
   DOI = {10.1109/ICCCN.2010.5560103},
   reviewed = {1},
   author = {Heer, Tobias and Jansen, Thomas and Hummen, Ren{\'e} and Wirtz, Hanno and G{\"o}tz, Stefan and Weingaertner, Elias and Wehrle, Klaus}
}