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SUMMARY:Mobicom Rehearsal Day - Liam McNamara (UCL)\, Anders Lindgren (U. 
 Cambridge)\, Mirco Musolesi (U.Cambridge)
DTSTART:20080911T120000Z
DTEND:20080911T140000Z
UID:TALK13465@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:1)Media Sharing based on Colocation Prediction in Urban Transp
 ort\nLiam McNamara\, Cecilia Mascolo and Licia Capra\nMOBICOM\n\nPeople li
 ving in urban areas spend a considerable amount of time on  \npublic trans
 port\, for example\, commuting to/from work. During these  \nperiods\, opp
 ortunities for inter-personal networking present  \nthemselves\, as many m
 embers of the public now carry electronic devices  \nequipped with Bluetoo
 th\nor other wireless technology. Using these devices\, individuals can  \
 nshare content (e.g.\, music\, news and video clips) with fellow  \ntravel
 lers that are on the same train or bus. Transferring media  \ncontent take
 s time\; in order to maximise the chances of successful  \ndownloads\, use
 rs should identify neighbours that possess desirable  \ncontent and who wi
 ll travel with them for long-enough periods. In this  \nwork\, we propose 
 a user-centric prediction scheme that collects  \nhistorical colocation in
 formation to determine the best content  \nsources. The scheme works on th
 e assumption that people have a high  \ndegree of regularity in their move
 ments. We ?rst validate this  \nassumption on a real dataset\, that consis
 ts of traces of people moving  \nin a large citys mass transit system. We 
 then demonstrate  \nexperimentally on these traces that our prediction sch
 eme  \nsigni?cantly improves communication e?ciency\,\nwhen compared to a 
 memory(history)-less source selection scheme.\n\n2) Phase Transitions of O
 pportunistic Communications\nPan Hui and Anders Lindgren\nCHANTS Workshop\
 n\n  In this paper\, we study the utility of opportunistic communication\n
   systems with the co-existence of network infrastructure. We study how\n 
  some important performance metrics change with varying degrees of\n  infr
 astructure and mobile nodes willing to participate in the\n  opportunistic
  forwarding. In doing so\, we observe phase transitions\n  in the utility 
 of infrastructure and opportunistic forwarding\n  respectively at differen
 t points in the design space.  We discuss\n  the implications that this ha
 s for the design of future network\n  deployments and how this observation
  can be used to improve network\n  performance\, while keeping cost at a m
 inimum.\n\n\n3) Networking in the Land of Northern Lights - Two Years of  
 \nExperiences from DTN System Deployments' Anders Lindgren\, Avri Doria\, 
  \nJan Lindblom and Mattias Ek\,\nWiNS-DR Workshop\n\nThe Smi Network Conn
 ectivity (SNC) project was started to\n  enable Internet connectivity for 
 the Smi population of reindeer\n  herders in the Laponia region in norther
 n Sweden. In this area\, no\n  infrastructure and thus\, no Internet conne
 ctivity is normally\n  available. Thus\, DTN functionality is used to enab
 le connectivity\n  through the use of mobile relays.  This paper describes
  deployments\n  and field tests done within the SNC project and its contin
 uation\n  SNC+1\, in which a Delay-Tolerant Networking system was\n  deplo
 yed in the target region. During these deployments\, the PRoPHET  \nroutin
 g\n  protocol\, and three different applications were deployed and tested\
 n  sucessfully.\n\n4) A Framework for Multi-region Delay Tolerant Networki
 ng\nMirco Musolesi and Cecilia Mascolo\nWiNS-DR Workshop\n\nAlmost all the
  existing work on routing in delay tolerant networks has  \nfocussed on th
 e problem of delivery of messages inside a single  \nregion\, characterize
 d by the same network infrastructure and  \nnamespace. However\, many depl
 oyment scenarios\, especially in  \ndeveloping regions\, will probably inv
 olve routing among di?erent  \nregions composed of several heterogeneous t
 ypes of network domains  \nsuch as WiMAX or satellite networks and ad hoc 
 networks composed of  \nshort- range radio enabled devices\, like mobile p
 hones with Bluetooth  \ninterface. In this work\, we introduce a proposal 
 for inter-region  \nrouting based on both probabilistic and deterministic 
 forwarding  \nmechanisms\, embedded in an architectural framework able to 
 support it.  \nWe also compare our solution to existing approaches in dela
 y tolerant  \nnetworking\, discussing the main requirements and possible s
 olutions\,  \nand outlining the open research problems.\n
LOCATION:Lecture Theatre 2\, Computer Laboratory\, William Gates Builiding
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