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Mobicom Rehearsal Day

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1)Media Sharing based on Colocation Prediction in Urban Transport Liam McNamara, Cecilia Mascolo and Licia Capra MOBICOM

People living in urban areas spend a considerable amount of time on public transport, for example, commuting to/from work. During these periods, opportunities for inter-personal networking present themselves, as many members of the public now carry electronic devices equipped with Bluetooth or other wireless technology. Using these devices, individuals can share content (e.g., music, news and video clips) with fellow travellers that are on the same train or bus. Transferring media content takes time; in order to maximise the chances of successful downloads, users should identify neighbours that possess desirable content and who will travel with them for long-enough periods. In this work, we propose a user-centric prediction scheme that collects historical colocation information to determine the best content sources. The scheme works on the assumption that people have a high degree of regularity in their movements. We ?rst validate this assumption on a real dataset, that consists of traces of people moving in a large citys mass transit system. We then demonstrate experimentally on these traces that our prediction scheme signi?cantly improves communication e?ciency, when compared to a memory(history)-less source selection scheme.

2) Phase Transitions of Opportunistic Communications Pan Hui and Anders Lindgren CHANTS Workshop

In this paper, we study the utility of opportunistic communication
systems with the co-existence of network infrastructure. We study how
some important performance metrics change with varying degrees of
infrastructure and mobile nodes willing to participate in the
opportunistic forwarding. In doing so, we observe phase transitions
in the utility of infrastructure and opportunistic forwarding
respectively at different points in the design space.  We discuss
the implications that this has for the design of future network
deployments and how this observation can be used to improve network
performance, while keeping cost at a minimum.

3) Networking in the Land of Northern Lights – Two Years of Experiences from DTN System Deployments’ Anders Lindgren, Avri Doria, Jan Lindblom and Mattias Ek, WiNS-DR Workshop

The Smi Network Connectivity (SNC) project was started to enable Internet connectivity for the Smi population of reindeer herders in the Laponia region in northern Sweden. In this area, no infrastructure and thus, no Internet connectivity is normally available. Thus, DTN functionality is used to enable connectivity through the use of mobile relays. This paper describes deployments and field tests done within the SNC project and its continuation SNC +1, in which a Delay-Tolerant Networking system was deployed in the target region. During these deployments, the PRoPHET routing protocol, and three different applications were deployed and tested sucessfully.

4) A Framework for Multi-region Delay Tolerant Networking Mirco Musolesi and Cecilia Mascolo WiNS-DR Workshop

Almost all the existing work on routing in delay tolerant networks has focussed on the problem of delivery of messages inside a single region, characterized by the same network infrastructure and namespace. However, many deployment scenarios, especially in developing regions, will probably involve routing among di?erent regions composed of several heterogeneous types of network domains such as WiMAX or satellite networks and ad hoc networks composed of short- range radio enabled devices, like mobile phones with Bluetooth interface. In this work, we introduce a proposal for inter-region routing based on both probabilistic and deterministic forwarding mechanisms, embedded in an architectural framework able to support it. We also compare our solution to existing approaches in delay tolerant networking, discussing the main requirements and possible solutions, and outlining the open research problems.

This talk is part of the Computer Laboratory Systems Research Group Seminar series.

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