content-centric networking in delay/disruption-tolerant networks
DESCRIPTION
slides from WWIC 2012 Panel on DTNsTRANSCRIPT
WWIC 2012 Panel on Internetworking with Challenging Conditions
Content-Centric Networking in Delay/Disruption-Tolerant Networks
Torsten BraunUniversität Bern, [email protected]
Torsten Braun: Content-Centric Networking in Delay/Disruption-Tolerant Networks
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Traditional Information / Service Access
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web server / web service
DNS server
search engine /service registry
user’s end system
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Motivation for Content-Centric Networking
> Today’s network traffic is dominated by information retrieval rather than point-to-point communication between machines or humans.
> Today: huge amount of data sent redundantly on a link.> Circuit communication model might not be appropriate any more. > Future communication architecture should focus on information
objects instead of nodes. > Several research projects, e.g.,
— US: NDN/CCNx— Europe: SAIL/NetInf, Pursuit
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Content-Centric Networking (CCN)
> [Jacobson et al., ACM CONEXT, December 2009]> Combination of content lookup and message routing> Idea: describe the users’ interests in the message header,
but not where to get it. > Messages
— Interest: content name, selector— Data: content name, signature (info), data
> Hierarchical content names— Example: /unibe.ch/braun/lecture/20120529
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Content Distribution with CCN
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32
4 5 76
Interest/Data
/unibe.ch/braun/lecture/20120529
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Advantages of CCN
> Automatic content searching and distribution> ≤ 1 round-trip-time> Latency reduction> Bandwidth reduction (cf. multicast)
> Open Issues: routing and naming
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Benefits of CCN in Wireless/Mobile Networks
> Broadcast property of wireless medium single Interest for many neighbor nodes
> No beaconing required to learn about neighbor nodes> Reduced delay and network load due to possible caching> Support of short mobile nodes’ encounters
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CCN in DTNs
Name Origin of Interest
Data
/feeds.sf.tv/podcast/10vor10 me -
/youtube.com/movies/ DesperateHousewives
mydaughter -
… … …
/unibe.ch/braun/lecture/ OperatingSystems
me,mystudent
bs.mpg
… … …
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Encounter
> Possible message exchange at encounter1. Exchange of interests, possibly with priority of own / friends’ interests2. Exchange of relevant data
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Conclusions
> Content-Centric Networks and Delay/Disruption-Tolerant Networks seem to be a good match. — No needs for beacons— Exploitation of wireless broadcast media— Efficient exchange of Interests and Data
> Current work on searching in content directories> Publish / Scribe approaches might be less beneficial.
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Thanks for your attention !
> [email protected] > cds.unibe.ch
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