Re: [AVTCORE] Commentson draft-vancaenegem-avtcore-fb-supp-and-retransm-00

[Roni Even <[e-mail]>]

Hi Ali,
Sorry about my email,
I read the retransmission-for-ssm and my comments are on that draft.
Roni

> -----Original Message-----
> From: Ali C. Begen (abegen) [mailto:[e-mail]]
> Sent: Sunday, June 19, 2011 9:07 PM
> To: Roni Even; IETF AVTCore WG; VAN CAENEGEM Tom
> Cc: Magnus Westerlund
> Subject: RE: [AVTCORE] Commentson draft-vancaenegem-avtcore-fb-supp-
> and-retransm-00
> 
> Did you check
> https://datatracker.ietf.org/doc/draft-vancaenegem-avtcore-
> retransmission-for-ssm/
> ? It addresses at least some of the points you made below.
> 
> -acbegen
> 
> > -----Original Message-----
> > From: [e-mail] [mailto:[e-mail]] On Behalf Of
> Roni Even
> > Sent: Sunday, June 19, 2011 6:47 AM
> > To: 'IETF AVTCore WG'; 'VAN CAENEGEM Tom'
> > Cc: 'Magnus Westerlund'
> > Subject: Re: [AVTCORE] Commentson draft-vancaenegem-avtcore-fb-supp-
> and-retransm-00
> >
> > Hi,
> > I have finally found the time to read the document. I agree with
> Magnus that
> > the issue of retransmission in the RAMS architecture where the RS and
> FT are
> > collocated is not specified and it should also be reflected in the
> feedback
> > suppression draft.
> > I think the draft has good text on the analysis of the feedback
> suppression
> > and this should be added to the WG document. Maybe Tom and Qin can
> work on
> > the WG document on this topic.
> > As for the retransmission, I am not sure if this should be as part of
> the
> > suppression draft. If the issue is only for the case where we have
> the FT/RS
> > collocated with unicast feedback as in the RAMS case maybe it can be
> in the
> > RAMS scenario draft. If we are looking at a broader retransmission
> case
> > (that is not well specified in current draft) that includes also the
> > multicast retransmission from the RS or from the DS it may be good to
> > discuss it as part of the WG document.
> >
> > Regards
> > Roni
> >
> >
> >
> > > -----Original Message-----
> > > From: [e-mail] [mailto:[e-mail]] On Behalf
> Of
> > > Magnus Westerlund
> > > Sent: Saturday, March 26, 2011 12:24 PM
> > > To: IETF AVTCore WG; VAN CAENEGEM Tom
> > > Subject: [AVTCORE] Comments on draft-vancaenegem-avtcore-fb-supp-
> and-
> > > retransm-00
> > >
> > > Tom, AVTCORE,
> > >
> > > I have reviewed this draft and have the following comment.
> > >
> > > To me it appears that one big reason for the issues is actually
> that we
> > > haven't specified how RTP retransmission in SSM with unicast
> delivery
> > > is
> > > supposed to work. Because if that was well defined we would likely
> have
> > > concluded that one should not forward NACK request to the DS from a
> FT
> > > for any request it service locally.
> > >
> > > Thus as I raised before in relation to the RAMS work that there
> > > appeared
> > > to be a need for defining this properly, including this aspect. Do
> we
> > > have anyone that is interested in defining this?
> > >
> > > Secondly I think there clearly are some improvements needed of the
> WG
> > > document based on what you comment. One thing is clearly to clarify
> the
> > > WG document on its usages, and then map those usages of suppression
> to
> > > different topologies.
> > >
> > > My personal opinion on how to handle your comments are to include
> your
> > > concerns in the WG document.
> > >
> > > Cheers
> > >
> > > Magnus Westerlund
> > >
> > > -------------------------------------------------------------------
> ---
> > > Multimedia Technologies, Ericsson Research EAB/TVM
> > > -------------------------------------------------------------------
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