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[tsvwg] [iccrg] CCID5 - BBR for DCCP

nathalie.romo-moreno@telekom.de Tue, 09 November 2021 15:03 UTC

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From: nathalie.romo-moreno@telekom.de
To: iccrg@irtf.org
CC: tsvwg@ietf.org
Thread-Topic: [iccrg] CCID5 - BBR for DCCP
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Date: Tue, 09 Nov 2021 15:02:59 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/hzEwUaDzUBEwkNssdH8V95pjSJ0>
Subject: [tsvwg] [iccrg] CCID5 - BBR for DCCP
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Dear all,

As discussed yesterday, at the ICCRG session I would like to bring here 2 topics to discussion.

In a first instance, we would like to start the process to bring BBR as a new CCID profile for DCCP. As an initial step, we have submitted the draft https://www.ietf.org/id/draft-romo-iccrg-ccid5-00.txt and we would be happy to receive any feedback or comment on it. It is worth to mention that our goal is not to propose definitions related to the Congestion Control algorithm itself, which is defined protocol agnostic at https://datatracker.ietf.org/doc/draft-cardwell-iccrg-bbr-congestion-control/, but to outline the necessary requirements to use it within DCCP.

The second topic I would like to discuss, is related to the problem found during the implementation of BBRv1 for DCCP. To summarize it, BBR requires the restoration of the cwnd when leaving the probeRTT phase, that restoration implies a big change (from a low to a high value) of the cwnd, and therefore a previous synchronization of the DCCP sequence and acknowledgement validity windows (RFC4340<https://datatracker.ietf.org/doc/html/rfc4340> section 7.5). Such synchronization is per DCCP RFC4340 a reliable negotiation to be confirmed and therefore takes at least one RTT, increasing the duration of the probeRTT phase. In the presentation slides<https://datatracker.ietf.org/meeting/112/materials/slides-112-iccrg-ccid5-an-implementation-of-bbr-congestion-control-algorithm-for-dccp-00> you can find a more detailed description of the problem as well as the temporary solution that has been implemented. Here we would like to bring to consideration the possibility of enhancing or modifying the DCCP Sequence window negotiation process.


Best Regards
Nathalie Romo Moreno

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