Transcript MultiCarrier – Orthogonal Frequency Division Multiple Access

50 PhD Graduates Celebration Event
Aalborg, April 11, 2008
Beyond 2020
Content Centric Networking
Martijn Kuipers
© 2007, it - instituto de telecomunicações. Todos os direitos reservados.
Conversation & Dissemination
• Today's networks exist (circuit switched
and TCP/IP) to allow two entities to have a
conversation.
• More than 99% of today’s networks is for
an entity to acquire or distribute named
chunks of data (like web pages or email
messages).
• Acquiring or distributing named chunks
of data is not conversation, it’s a
dissemination.
Beyond 2020
Content Centric Networking
2 | Aalborg, April 11, 2008
Data matters !
• In a dissemination (e.g., getting a web
page) the data matters but not who gives it
to you.
• It’s possible to disseminate via
conversation and accomplish the user’s
goal as a side effect but:
• It’s inefficient (hotspots, poor reliability,
poor utilization).
• Users have to do the translation
between their goal & its realization.
Beyond 2020
Content Centric Networking
3 | Aalborg, April 11, 2008
Data matters !
• Data is requested, by name, using any and
all means available.
• Anything that hears the request and has a
valid copy of the data can respond.
• The returned data is signed, and optionally
secured, so its integrity & association with
the name can be validated.
Beyond 2020
Content Centric Networking
4 | Aalborg, April 11, 2008
Trust the content, not the
connection
• Trust & data integrity are foundation of the
design, not an add-on.
• Trust is associated with user level objects,
not abstractions like an SSL connection.
• Network transacts in content, not
conversations, so popular content won’t
generate congestion.
Beyond 2020
Content Centric Networking
5 | Aalborg, April 11, 2008
Advantages of dissemination
• Since nodes don’t need names, wireless &
sensor nets can use simpler, local protocols
(e.g., proximity, diffusion).
• Data can be cached by any node so
intermittent operation doesn’t preclude
communication.
• Delay is not only tolerated, it’s irrelevant.
• Can use opportunistic transport (e.g., planes
overhead, car-roadway-car, fellow travellers).
Beyond 2020
Content Centric Networking
6 | Aalborg, April 11, 2008
Conclusion
• With IP the need to switch the “wires” is
gone, but we still need to switch the data !
Dissemination would fix this.
• Dissemination is already here in the form
of overlays (BitTorrent p2p, Sonos mesh,
Apple Rendezvous). There clearly is a
need.
• We need to look beyond the current way of
doing things and start concentrating more
on the data instead of the network.
Beyond 2020
Content Centric Networking
7 | Aalborg, April 11, 2008
References
• IST-4WARD Project, http://www.4wardproject.eu
• Van Jacobsen, “If a Clean Slate is the
solution what was the problem?”, Stanford
‘Clean Slate’ Seminar, February 27, 2006
Beyond 2020
Content Centric Networking
8 | Aalborg, April 11, 2008