Re: [EXT] Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbit-measurements)

Hello Ian,

I confirm that the implementation of our solution is pretty simple.

Follows the link to our implementation in quic-go; the last two functions of linked source file handle the logic needed to process Q and R bits.

https://github.com/fabiobulgarella/quic-go/blob/tim-pl2-qr/packet_packer.go

Thanks and happy easter,

Fabio B.

Telecom Italia (TIM)

________________________________
Da: ippm <ippm-bounces@ietf.org> per conto di Ian Swett <ianswett=40google.com@dmarc.ietf.org>
Inviato: mercoledì 8 aprile 2020 21:43
A: Cociglio Mauro
Cc: quic@ietf.org; IETF IPPM WG (ippm@ietf.org); Lubashev, Igor; alexandre.ferrieux@orange.com; isabelle.hamchaoui@orange.com; Riccardo Sisto
Oggetto: [EXT] Re: [ippm] New QUIC Packet Loss Measurement (draft-cfb-ippm-spinbit-measurements)

Thanks for sharing this.  From my perspective, this is an improvement upon the previous proposal in terms of robustness.  This design feels very similar to the spin bit, and seems trivial to implement, which are also nice properties.

Also, QUIC doesn't really have retransmissions, so the 'R bit' name always made me a bit uncomfortable.

I'm not saying QUIC should adopt this yet, but I'd be interested in seeing a privacy analysis completed for it.

Ian

On Wed, Apr 8, 2020 at 4:25 AM Cociglio Mauro <mauro.cociglio=40telecomitalia.it@dmarc.ietf.org<mailto:40telecomitalia.it@dmarc.ietf.org>> wrote:
Dear QUIC WG Members.

We submitted to IPPM WG a draft where we described a new 2 bit packet loss methodology (https://tools.ietf.org/html/draft-cfb-ippm-spinbit-measurements-01).
The measurement of packet loss is under discussion in QUIC WG and our draft introduces two alternatives about it.
The first one is a spin-bit dependent signal and uses a single bit. The second one, described in the following linked slides, is a standalone solution based on a two bits loss signal and on alternate marking (RFC8321)..
This last methodology improves, in our opinion, the algorithm proposed by Orange and Akamai described in https://tools.ietf.org/html/draft-ferrieuxhamchaoui-quic-lossbits-03.

The 2 bits are the sQuare bit (Q-bit) and the Reflection square bit (R-bit).
The Q-bit doesn’t change from the Ferrieux-Hamchaoui draft but the R-bit substitutes the L-bit.
This avoids the L-bit dependence from an internal protocol variable, a problem raised in the last QUIC interim meeting.

You can find the slides, we prepared for the IPPM interim meeting, at the following link: https://github.com/ietf-ippm/meeting-materials/blob/aa486f7ead28b9f55c5ef499e5c9ed33ab06daf9/ietf107-virtual/Slides/07-spinbit-measurements.pdf

Comments and suggestions are always welcome.

Of course we are available to present our proposals in the next QUIC WG meeting or to arrange a Webex side meeting if needed.

Best regards.

Mauro, Fabio, Giuseppe, Massimo and Riccardo

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Mauro Cociglio
TIM - CT.TA.EI
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Mobile: +393357669751<tel:+39%20335%20766%209751>
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