Re: [rohc] Empty CSRC list issue in IR packet.
Ghyslain Pelletier <Ghyslain.Pelletier@ericsson.com> Fri, 29 August 2003 11:30 UTC
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From: Ghyslain Pelletier <Ghyslain.Pelletier@ericsson.com>
Organization: Ericsson Erisoft AB, Ericsson Research Corporate Unit
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To: Remi Pelland <remi.pelland@octasic.com>
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Subject: Re: [rohc] Empty CSRC list issue in IR packet.
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Hi all, Does the following summarizes accurately the consensus that Remi is looking after? 1) Section 4.3.1 and 4.3.2 of the implementer's guide clarifies rfc3095, and they should remain as they are. The text is clear, bring a clarification inline with the standard, and this has been interop tested. These two sections therefore do not need to be modified. In summary, when an empty CSRC list is present, an empty generic list (1-2 octets) must be inserted. Tommy's mail would then represent the consensus on this: http://www1.ietf.org/mail-archive/working-groups/rohc/current/msg01654.html 2) Section 4.3.3 of the implementer's guide should be removed. Section 4.3.3 of the implementer's guide is a "deviation" from the standard that proposes an improvement that would remove the need to send an empty generic list (1-2 octets) in the presence of an empty CSRC list. It is a deviation in the sense that the generic CSRC list in rfc3095 is of variable lenght but is not optional (must be present), while the text in 4.3.3 is keeping it of variable length but makes it optional. Section 4.3.3 should thus be removed from the implementer's guide, but could later be considered as a proposed improvement when bringing rfc3095 to draft standard if the profile gets updated at the same time. Abigail's mail would then represent the consensus on this: http://www1.ietf.org/mail-archive/working-groups/rohc/current/msg01655.html Is my understanding of the conclusions/consensus correct? If so, then we will update the Implementer's guide accordingly. /Ghyslain -- Ghyslain Pelletier, Dipl. Ing. Wireless IP Optimizations AWARE - Advanced Wireless Algorithm Research Ericsson Research, Corporate Unit Ericsson AB, Laboratoriegränd 11 Box 920, S-97128 Luleå, SWEDEN Phone : +46 (0) 920 20 24 32 Mobile: +46 (0) 706 09 27 73 Ghyslain.Pelletier@ericsson.com http://www.ericsson.com I have a new mail address: Ghyslain.Pelletier@ericsson.com My old e-mail address will function until 2004-06-01. Please change my address in your personal address book. Remi Pelland wrote: > > Hi, > > A couple of weeks ago, there was a discussion about a section in the latest > implementer's guide that corrects RFC 3095 with regards to the handling of > empty CSRC lists: section 5.7.7.6 of the RFC says that an empty generic list > is inserted, while section 4.3.3. of the implementer's guide modifies the > RFC by saying that no generic list should be present. > > There seemed to be a concensus among those involved in the discussion to > follow the RFC since this is how interoperability was tested. That's fine > and I do not want to restart the discussion on this. > > Now, it has been a couple of weeks and there hasn't been any final > conclusion on this issue (i.e. officially stating that the RFC method should > be used, anouncing the associated correction to the implementer's guide, > etc...). > > Based on the concensus that existed, I don't think there's a problem for > those who currently receive mailing list messages. However, it seems to me > like there's a risk that future implementations may use either methods, > leading to interoperability problems. > > Thanks, > Remi. > > _______________________________________________ > Rohc mailing list > Rohc@ietf.org > https://www1.ietf.org/mailman/listinfo/rohc _______________________________________________ Rohc mailing list Rohc@ietf.org https://www1.ietf.org/mailman/listinfo/rohc
- [rohc] Empty CSRC list issue in IR packet. Remi Pelland
- RE: [rohc] Empty CSRC list issue in IR packet. Remi Pelland
- Re: [rohc] Empty CSRC list issue in IR packet. Ghyslain Pelletier
- Re: [rohc] Empty CSRC list issue in IR packet. Ghyslain Pelletier
- RE: [rohc] Empty CSRC list issue in IR packet. Lars-Erik Jonsson (LU/EAB)
- Re: [rohc] Empty CSRC list issue in IR packet. Kristofer Sandlund
- RE: [rohc] Empty CSRC list issue in IR packet. Lars-Erik Jonsson (LU/EAB)
- RE: [rohc] Empty CSRC list issue in IR packet. Surtees, Abigail
- RE: [rohc] Empty CSRC list issue in IR packet. Lars-Erik Jonsson (LU/EAB)