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SUMMARY:Large-Scale Peer-to-Peer Discovery Mechanism for Frequency Allocat
 ion - Magnus Skjegstad (University of Oslo)
DTSTART:20121116T150000Z
DTEND:20121116T160000Z
UID:TALK40255@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:Scarcity of frequencies combined with the demand for more band
 width is likely to increase the need for devices that provide high wireles
 s bandwidth in limited areas while using a wired network to carry data ove
 r longer distances. Examples of such devices are Wi-Fi routers and femtoce
 lls and future devices that use TV whitespace. To utilize the available fr
 equencies more efficiently radios must be able to find other users of the 
 frequency bands and adapt so that they are not interfered. As transmitters
  hundreds of kilometers away may cause as much interference as a transmitt
 er located next door\, this mechanism can not be based on location alone. 
 Central databases can be used for this purpose\, but with thousands or mil
 lions of radio devices to coordinate a centralized system may not always b
 e ideal. In this talk\, we describe a decentralized protocol and architect
 ure for discovering interfering radio devices over the Internet. The proto
 col has low bandwidth-\, memory- and processing requirements\, making it s
 uitable for platforms with limited resources. We evaluate the protocol thr
 ough simulation in network topologies with up to 1 000 000 nodes\, includi
 ng topologies generated from three municipalities in Norway. \n\nThis talk
  is based on joint work with Brage Ellingsæter\, Torleiv Maseng and Jon C
 rowcroft.\n\nBio: Magnus Skjegstad is a PhD student at University of Oslo 
 and Norwegian Defence Research Establishment (FFI). He is currently visiti
 ng the NetOS group at Cambridge University.\n
LOCATION:FW26\, Computer Laboratory\, William Gates Builiding
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