Re: [Sipping] Request for Open discussion about SIP mobility

["Saverio Niccolini" <[e-mail]>]

Then my question is:
is SIP mobility something interesting to be investigated for the group?

I would like to stimulate discussion around this set of drafts:
http://www.ietf.org/internet-drafts/draft-izumikawa-sipping-sipbicast-01.txt
http://tools.ietf.org/html/draft-niccolini-sipping-siphandover-03
http://tools.ietf.org/html/draft-salsano-sipping-siphandover-solution

It seems to me that they both address the same issue with similar
scenarios in mind and similar requirements, in the end they differ for the
technical solution proposed (as for the standardization requirements
if it is an additional header we may need ot go to SIP, but if it is up
to changing lines in SDP then it is MMUSIC)

--> if we can get an agreement that the issues/scenario and common
set of requirements then this would be a good basis for discussion
and we can rpoceed from there

Anyone having an opinion on this?

Cheers,
Saverio

============================================================
Dr. Saverio Niccolini
NEC Laboratories Europe, Network Research Division	
Kurfuerstenanlage 36, D-69115 Heidelberg
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> -----Original Message-----
> From: [e-mail] 
> [mailto:[e-mail]] On Behalf Of Paul Kyzivat
> Sent: Thursday, May 08, 2008 5:32 PM
> To: Haruki Izumikawa
> Cc: SIPPING LIST
> Subject: Re: [Sipping] Request for Open discussion about SIP mobility
> 
> 
> 
> Haruki Izumikawa wrote:
> > Dear Stefano,
> > 
> > Thank you for your interest. I have reviewed your updated 
> I-Ds. As you 
> > pointed, I also think that we share common requirements and 
> scenarios.
> > 
> > I understand the addition of a new SIP header could not be a major 
> > concern. In fact, I have proposed a new SIP header for 
> bicasting before.
> > But, I'm afraid that the addition of a new SIP header falls 
> into terms 
> > of reference of SIP WG, not SIPPING WG. How do you feel about it?
> 
> That is true. But the work could and should start in SIPPING. 
> If it eventually is decided that a new header is needed then 
> that work would be shifted to the SIP WG with blessings from 
> SIPPING. Since there is a huge overlap in participation that 
> should not cause any difficulty.
> 
> 	Thanks,
> 	Paul
> 
> > Best wishes,
> > 
> > Haruki
> > 
> > 
> > Stefano Salsano wrote:
> >> Dear Haruki,
> >>
> >> thank you for restarting discussion on SIP mobility. I 
> agree with the 
> >> importance to discuss this topic in this WG.
> >>
> >> I'd like to bring again to the attention of the WG two related 
> >> internet drafts that we submitted some time ago and that we've now 
> >> updated
> >>
> >> [1] Requirements for vertical handover of multimedia 
> sessions using 
> >> SIP
> >> http://tools.ietf.org/html/draft-niccolini-sipping-siphandover-03
> >>
> >> [2] A solution for vertical handover of multimedia 
> sessions using SIP
> >> 
> http://tools.ietf.org/html/draft-salsano-sipping-siphandover-solution
> >> -02
> >>
> >> Now I would like in particular to focus on the 
> requirements draft [1] 
> >> and to make some comparison with your work.
> >>
> >> It seems that the requirements and scenarios we consider 
> are largely 
> >> overlapping (while we take different approaches for solutions).
> >>
> >> We have in common the idea of letting the Correspondant 
> Node as much 
> >> as possible not involved in the seamless handover 
> procedure and the 
> >> introduction of some sort of B2BUA to assist in the procedure. We 
> >> also share the idea that bi-casting can improve the handover and 
> >> needs to be properly managed.
> >>
> >> As you have already outlined in your draft, a difference in the 
> >> requirements is that you would like not to introduce new 
> >> headers/parameters while we allow it.
> >>
> >> My point here is that the introduction of the new headers in our 
> >> scenario only concerns the handover-capable mobile device and the 
> >> intermediate element which is in charge to assist in the handover 
> >> procedure. Correspondant Node and all other SIP elements are not 
> >> touched anyhow. I feel that in any case there the need to 
> implement a 
> >> lot of specicif logic to properly handle the bi-casting (not to 
> >> mention the problem of discovery of intermediate element that you 
> >> deliberately neglect in your draft to simplify the problem). 
> >> Therefore the addition of a new header may not be the 
> biggest issue.
> >>
> >> Anyway these aspects could be clarified with some deeper technical 
> >> discussion, which I hope can start in the WG.
> >>
> >> Best regards,
> >> Stefano
> >>
> >> Haruki Izumikawa wrote:
> >>> Hello folks,
> >>>
> >>> I'd like to have an open discussion about SIP-based 
> mobility in this ML.
> >>> Mobility managements using SIP have been actively studied and 
> >>> developed worldwide since "Mobility Support Using SIP" 
> (by Elin and 
> >>> Henning) was published. SIP-based mobility would have strong 
> >>> advantages such as its great affinity for an application 
> as well as 
> >>> flexibility, i.e., terminal mobility can be optimally 
> supported independent from underlying network.
> >>> On the other hand, despite many advantages, it is not used for 
> >>> large-scale commercial yet. In addition, the discussion about 
> >>> SIP-based mobility in IETF seems to be undynamic.
> >>> These days, a multimode terminal is getting popular. Each access 
> >>> networks, e.g., cellular and WLAN, have different 
> characteristics in 
> >>> terms of throughput or delay. In such a heterogeneous 
> network, SIP 
> >>> becomes more useful tool for mobility management because of its 
> >>> flexibility. The quality of a multimedia service can be 
> adaptively 
> >>> changed in accordance with a nature of an access networks 
> even after 
> >>> changing an access network. I think it is time to resume 
> discussing 
> >>> about SIP-based mobility. For your information, I have 
> submitted I-D 
> >>> regarding seamless session handoff by SIP-based bicasting.
> >>> 
> http://www.ietf.org/internet-drafts/draft-izumikawa-sipping-sipbicas
> >>> t-01.txt
> >>>
> >>> I would be happy to hear frank opinions of SIP specialists.
> >>>
> >>> Best regards,
> >>>
> >>> Haruki
> >>>
> >>>
> >>
> > 
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