[Iccrg] Re: [multipathtcp] Please review "Coupled Congestion Control for Multipath Transport Protocols"

[Michael Welzl]

I'll do it!

Cheers,
Michael


On Jan 20, 2011, at 1:25 AM, <philip.eardley at bt.com> <philip.eardley at bt.com 
 > wrote:

> The Multipath TCP WG has developed a congestion control algorithm  
> that enables a TCP connection to use multiple paths.
> http://tools.ietf.org/html/draft-ietf-mptcp-congestion
>
> We’re hoping to WG Last Call this document in February, so it would  
> be great if anyone from ICCRG could review it
>
> Thanks,
> Phil & Yoshifumi
> MPTCP WG Chairs
>
> Abstract
>
>    Often endpoints are connected by multiple paths, but communications
>    are usually restricted to a single path per connection.  Resource
>    usage within the network would be more efficient were it possible  
> for
>    these multiple paths to be used concurrently.  Multipath TCP is a
>    proposal to achieve multipath transport in TCP.
>
>    New congestion control algorithms are needed for multipath  
> transport
>    protocols such as Multipath TCP, as single path algorithms have a
>    series of issues in the multipath context.  One of the prominent
>    problems is that running existing algorithms such as TCP New Reno
>    independently on each path would give the multipath flow more than
>    its fair share at a bottleneck link traversed by more than one of  
> its
>    subflows.  Further, it is desirable that a source with multiple  
> paths
>    available will transfer more traffic using the least congested of  
> the
>    paths, hence achieving resource pooling.  This would increase the
>    overall utilization of the network and also its robustness to
>    failure.
>
>    This document presents a congestion control algorithm which couples
>    the congestion control algorithms running on different subflows by
>    linking their increase functions, and dynamically controls the
>    overall aggresiveness of the multipath flow.  The result is a
>    practical algorithm that is fair to TCP at bottlenecks while moving
>    traffic away from congested links.
>
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