Emmanuel Lochin

He joined ISAE / LAAS-CNRS in September 2007 as researcher and network security officer.

His research interests include DTN, Network Coding, New Transport Protocols, Congestion Control.

Program Committee Membership:

• Workshop Chair of ICST Mobiquitous 2010
• TPC member ICST MONAMI 2010
• TPC member IEEE ICC 2010

Current Research

I am mostly involved in the DTN area and in particular, I study congestion and reliable mechanisms for long delay and satellite links. See my publications page for further details.

TETRYS: reThinking rEliabiliTy foR long-delaY networkS

TETRYS enables a new reliability algorithm specifically useful when retransmission is either problematic or not possible. In case of multimedia or multicast communications and in the context of the Delay Tolerant Networking (DTN), the classical retransmission schemes can be counterproductive in terms of data transfer performance or not possible when the acknowledgment path is not always available. Indeed, over long delay links, packets retransmission has a meaning of cost and must be minimized. The purpose of Tetrys is to propose a novel reliability mechanism with an implicit acknowledgment strategy that could be used either within these new DTN proposals, for multimedia traffic or in the context of multicast transport protocols. This proposal is based on a new on-the-fly erasure coding concept specifically designed to operate efficient reliable transfer over bi-directional links. Tetrys allows to unify a full reliability with an error correction scheme. Tetrys is not sensitive to the loss of acknowledgments while ensuring a faster data availability to the application compared to other traditional acknowledgment schemes. See these papers for details:

• On-the-Fly Coding for Time-Constrained Applications - ISAE Technical Report
• On-the-Fly Coding for Real-Time Applications - In Proc. of ACM Multimedia 2009
• Rethinking Reliability for Long-Delay Networks - In Proc. of IWSSC 2008

TCP Congestion Event Detection Tool

I have a great interest in transport protocols and as a matter of fact, I'm interested in tuning and investigating new TCP versions over satellites and new wireless access. In particular, I work on the design of an efficient algorithm able to accurately estimate TCP congestion events. TCED is a graphical tool analysis for TCP connections. TCED allows the identification of TCP Congestion Event for metrology purpose such as TCP protocol behaviour analysis. The philosophy of TCED is somehow different from others existing softwares such as Tstat or TFStat in the way where TCED is not a TCP losses estimation tool. A Congestion Event is defined as a set of losses occurring on a TCP window which involves a TCP congestion adaptation (i.e. a decrease of the current sending window). TCED proposes a method (based on the LEAST (Mark Allman) and Benko-Veres algorithms) able to identify a congestion event at the border of an autonomous system. TCED can also be used to detect retransmissions, losses and congestion events of many flow.
See TCED webpage for details.

New transport protocols for DTN and satellites

This work aims at studying DCCP/CCID3 and DCCP/CCID4 enhancements to efficiently carry out multimedia streaming and VoIP over long-delay links. This work is done in collaboration with NICTA. Together we are proposing new algorithms in order to fit media characteristics with application requirements.
See my publications for details.

STAMP: Server Topologic Analysis by Message headers Parsing

Check the STAMP webpage to download the code.

P-XCP

Chameleon Protocol

Check also the Chameleon page to download ns-2 code.

TCED: TCP Congestion Event Detection Tool

Kohonen-RED

Traffic Generators and Measurements

DCCP for FreeBSD 6.1

If you want to test gTFRC mechanism [gTFRC-IETF-draft], this following patch based on Lulea implementation contained it: freebsd61-gtfrc-dccp-lulea-01.09.2006.patch. (Special thanks to Sebastien Ardon)
To use it, you need to add in the DCCP traffic generator this setsockopt option:
setsockopt(socket, IPPROTO_DCCP, DCCP_GTFRC, &optval, sizeof(optval));

Performance measurements and comparison with ns-2 implementation are available here.
Others interesting results about the new TFRC in ns-2.30 are available here.

This work has been done at the National ICT Australia Ltd, NPC laboratory.

Others

A very simple httpd daemon based on inetd: lhttpd.

Partial Buffer Sharing queue patch for FreeBSD4.0/Kame/ALTQ is available here.

Je joue du saxophone baryton avec No Fish But Chips depuis mi-2008 et j'ai joué du saxophone baryton avec :

• No Water Please entre 1999 et 2005, co fondateur du groupe et remplacé par mon pote Laurent avant mon départ pour l'Australie
• Urban Sax entre 2002 et 2005
• Ocho Y Media sur l'album Cazador

ainsi que plein de formations alternatives avec différents saxes comme Le Gloub', Zinc2000 et bien d'autres. Je vous conseille d'ailleurs d'écouter Les Gueux dont certains membres sont issus des groupes précités.

J'aime particulièrement ces deux saxophonistes : Akosh S, que j'ai eu la chance de rencontrer le 09/07/04 au festival de la Pamparina à Thiers (63) et François Corneloup, dont j'ai l'impression à chaque fois que j'écoute sa musique (Jardins Ouvriers, Pidgin, ...) de découvrir quelquechose de nouveau. Je suis aussi un fervent admirateur de la musique de Sylvain Cathala, saxophoniste et ami dont vous pouvez consulter les différents projets musicaux ici. Dans un autre registre, j'étais fan de Jasmine Band (maintenant Jasmine Vegas) et de son contrebassiste monumental Stephen Harisson, maintenant dans Freebidou (formation à découvrir d'urgence). J'aimais aller les écouter à l'Atmosphère (café se trouvant prêt du canal Saint Martin à Paris) avec mes amis musiciens Laurent et Loïk. Enfin j'aime tout particulièrement Frix Quartet qui distille une musique super originale que je ne me lasse pas d'écouter.

Tenor sax harmonics