Various cOngestion conTrol
prOtocols over Satellite
JA-2410 Integration Meeting
Italian National Research Council (CNR)
Istituto di Scienza e Tecnologie dell’Informazione “A. Faedo” (ISTI)
Pisa –July 25th 2006
JA2410-FT VOTOS
Istituto di Scienza e Tecnologie
dell’Informazione “A Faedo”
The Votos FT: first experiments
•
•
Born in 2006 with the aim of studying the behavior of various TCP
flavors on several experimental platforms
First experiments made with various TCP flavors on CNIT's Skyplex in steady
state
Pisa –July 25th 2006
JA2410-FT VOTOS
Istituto di Scienza e Tecnologie
dell’Informazione “A Faedo”
The Votos FT: first experiments
•
•
•
Newreno Sack experiences
the maximum throughput
Westwood+ is more robust
with respect to packet
losses
SACK option does not add
significant improvement on
Westwood+
Pisa –July 25th 2006
JA2410-FT VOTOS
Istituto di Scienza e Tecnologie
dell’Informazione “A Faedo”
The Votos FT: TCP startup on DAMA
First experiments
showed that DAMA
interacts very badly
with TCP startup
behavior due to the
Slow Start algorithm
Pisa –July 25th 2006
JA2410-FT VOTOS
Istituto di Scienza e Tecnologie
dell’Informazione “A Faedo”
The Votos FT: validating a DAMA
simulator
• In order to better understand DAMA interactions with TCP, we wrote
a DAMA module for the ns-2 simulator
• The module was validated against measurements made on Skyplex
Pisa –July 25th 2006
JA2410-FT VOTOS
Istituto di Scienza e Tecnologie
dell’Informazione “A Faedo”
The Votos FT: TFRC over DAMA
• TFRC over DAMA is shown to exhibit
performance problems thanks to the
simulator we developed
• Quick Start (QS) protocol reduces the
startup delay
• Cross layer interaction between QS and
DAMA further enhances performance
Pisa –July 25th 2006
JA2410-FT VOTOS
Istituto di Scienza e Tecnologie
dell’Informazione “A Faedo”
The Votos FT: TFRC over DAMA
TFRC only
Pisa –July 25th 2006
TFRC+QS
JA2410-FT VOTOS
TFRC+QS with
Cross-layer DAMA
interaction
Istituto di Scienza e Tecnologie
dell’Informazione “A Faedo”
Related Publications
• Congress:
– Advanced Satellite Infrastructure in Future
Global Grid Computing: Network Solution to
Compensate Delivery Delay, in proceeding of
INGRID 2007, S.MARGHERITA LIGURE PORTOFINO, ITALY, APRIL 16-18, 2007
• Journal:
– Improving TFRC behavior in DVB Satellite
Networks, submitted to Computer Networks,
on May 2007
Pisa –July 25th 2006
JA2410-FT VOTOS
Istituto di Scienza e Tecnologie
dell’Informazione “A Faedo”