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Distribution de contenu à grande échelle appliquée aux fichiers et vidéos

Christoph Neumann 1
1 PLANETE - Protocols and applications for the Internet
Inria Grenoble - Rhône-Alpes, CRISAM - Inria Sophia Antipolis - Méditerranée
Abstract : Reliable multicast is certainly one of the most effective solutions to
distribute content, like files and videos, to a very large number
(i.e. possibly millions) of clients.
To that respect the ALC and FLUTE protocols, both coming from the IETF
Reliable Multicast Transport (RMT) working group, have recently been
adopted in the context of 3G cellular networks in 3GPP/MBMS and for
DVB-H IP Datacast services.

This work focuses on reliable multicast with massive scalability as a
core requirement, and it builds upon the RMT IETF solutions. These
reliable multicast protocols rely on several building blocks that we
investigate in detail:
- Forward Error Correction (FEC) Building Block:

We examine the broad class of ``Low Density Parity Check'' (LDPC)
large block FEC codes. We design derivates, namely LDGM-Staircase
and LDGM-Triangle, and benchmark these codes in detail with respect
to their error correcting capacities, memory requirements and
decoding/encoding speeds, and compare them to the Reed Solomon
small block code.
We find that LDPC codes and their implementation have very promising
performance, especially when used with large files.

The FEC building block must be adapted to the channel, and we
experimentally evaluate how to best schedule packets, and
derive some recommendations.

Finally, we analyze the codes with respect to their ability to
offer a partial reliability service, i.e. their ability to decode
parts of the content even if the whole decoding process cannot
finish because too many packet are missing. This study leads
to quite surprising results.

- Congestion Control Building Block:

We look at the startup behavior of the three congestion control
protocols RLC, FLID-SL and WEBRC. We show that the startup phase
of these protocols significantly impacts the performance of a file
download application.

This thesis has also several contributions at application level:
- FLUTE extensions:

The larger the content, the more efficient FEC protection is.
We therefore propose a mechanism to aggregate several files in
the file delivery protocol FLUTE, and also explain how to logically
group files.

- Video Streaming:

Designing a video streaming solution for an environment having no
or a constrained back channel, due for instance to scalability
leads to many challenges. We introduce the SVSoA version 1 and version 2
approaches, based on ALC.
The first one requires hierarchically encoded videos, while the latter
is more adapted to a wireless broadcast use case and does not need
hierarchical encoded videos anymore.
These approaches benefits from all the ALC reliable multicast protocols
assets in terms of unlimited scalability, congestion control and
error recovery.
Complete list of metadatas
Contributor : Christoph Neumann <>
Submitted on : Tuesday, March 7, 2006 - 5:38:16 PM
Last modification on : Thursday, March 5, 2020 - 6:50:28 PM
Long-term archiving on: : Saturday, April 3, 2010 - 8:15:16 PM


  • HAL Id : tel-00011791, version 1



Christoph Neumann. Distribution de contenu à grande échelle appliquée aux fichiers et vidéos. Réseaux et télécommunications [cs.NI]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00011791⟩



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