Toronto Networking Seminar

Organized by Department of Computer Science and Department of Electrical and Computer Engineering, University of Toronto

Underprovisioned Mini-P2P Networks

Gwendal Simon
Telecom Bretagne

Date: February 17,  3:10pm
Location: BA024 (Bahen Centre)


The delivery of live streams over the plain old best-effort Internet is a major challenge. Content Delivery Networks (like Akamai) make a great job in ensuring large-scale delivery of the most popular streams, but there are some cases where CDNs admit critical limitations too. We are interested in particular in the case of gamers who wants to broadcast screen-captured video of their games, in live. Each stream should be sent to a small number of other players, with a very low delay. This scenario is one of the use cases where using a peer-to-peer system really makes sense. Two problems arise. First, gamers watch several videos simultaneously, so they have to share their uplink contribution among the peer-to-peer systems they participate in. Second, some peer-to-peer overlays are under-provisioned, meaning that the peers have collectively not enough resources to guarantee the full delivery of the stream. This talk will address both problems, with a description of our proposals and some open perspectives.


Gwendal Simon received his Master Degree in Computer Science in 2000 and his PhD degree in Computer Science in 2004. From 2001 to 2006 he was a researcher at Orange Labs, where he worked on spontaneous networks and social media innovations. Since 2006, he has been Associate Professor at Telecom Bretagne, a graduate engineering school within the Institut Telecom. He is visiting researcher at University of Waterloo since September 2011.