Subject: RE: [Geopriv] draft-hdesinen-geopriv-pidflo-extn-00.txt

From: "Winterbottom, James" <[email-masked]>
Date: Thu, 20 Jul 2006 20:44:38 -0500

Actually PSAPs use this information to help them in deciding if it is
possible to obtain more accurate information if they were to ask for it
again. This is not really a matter of confidence.

> -----Original Message-----
> From: Andrew Newton [mailto:[email-masked]]
> Sent: Friday, 21 July 2006 11:25 AM
> To: Brian Rosen
> Cc: [email-masked]
> Subject: Re: [Geopriv] draft-hdesinen-geopriv-pidflo-extn-00.txt
> 
> Forgive me, this isn't my use case... I'm only trying to understand
it.
> 
> On Jul 20, 2006, at 9:08 PM, Brian Rosen wrote:
> 
> > No they don't care HOW you got location, they just want you to tell
> > them
> > where you are so they can route it.  They won't have any different
> > behavior
> > if the location you sent was determined by A-GPS or by TDOA.  PSAPs
> > care
> > about things like confidence, but not about mechanism.
> 
> Actually, RFC 4119 creates a "method" registry... which lists "A-
> GPS".  As I recall the discussion around this, it was precisely about
> PSAPs using it to judge confidence in the location.  Of course, this
> begs the question why the current mechanism isn't good enough.
> 
> > Then, why is it interesting that the PIDF-LO has A-GPS in it?  The
> > visited
> > network knows that already.  It also knows what protocols are
> > supported.
> > The scenario you present is entirely within the visited network,
> > and the
> > protocol is between the VNR and the VNP, which is within one
> > domain, and can
> > use any protocol it likes.  Conveying choices via the PIDF isn't
> > helping
> > anyone.  There has to be a use case where the VNP doesn't know what
> > protocol
> > it needs to use to contact the VNR.  I don't think such a case
exists.
> 
> My understanding was that the visited network doesn't know that the
> UAC supports A-GPS before hand.  You are right that the protocol
> between the VNP and VNR is not our concern.
> 
> -andy
> 
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