RE: [Geopriv] Comments on HELD-03

["Winterbottom, James" <[e-mail]>]

Doug, 

Ted's response hit the spirit of what I was trying to get at and I am
more than happy with his wording.

Different URIs will result in different types of behaviour at the LIS
and its subsequent responses. Defining, creating and controlling these
URIs is what the Context Management document
(http://tools.ietf.org/html/draft-winterbottom-geopriv-held-context-01)
addresses.

Cheers
James


> -----Original Message-----
> From: Stuard, Doug
> Sent: Tuesday, 8 January 2008 8:20 AM
> To: Ted Hardie; Winterbottom, James; Mary Barnes; Arolick, Eric;
Thomson,
> Martin; [e-mail]
> Subject: RE: [Geopriv] Comments on HELD-03
> 
> Perhaps the location returned should be the most recent. Merely
accessing
> the URI should not re-initiate location determination, as numerous
> spurious location taskings could result.  An update should be
specifically
> requested (although such update could be automated in some
applications).
> 
> _____________________________________________
> Doug Stuard
> Andrew Network Services
> 19700 Janelia Farm Blvd.
> Ashburn, VA 20147
> 703-726-5630
> (fax) 703-726-5600
> 
> Notice:
> 
> This communication from Andrew Corporation, including attachments,
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If
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> Thank you.
> 
> 
> > -----Original Message-----
> > From: Ted Hardie [mailto:[e-mail]]
> > Sent: Monday, January 07, 2008 2:21 PM
> > To: Winterbottom, James; Mary Barnes; Arolick, Eric; Thomson,
Martin;
> > [e-mail]
> > Subject: RE: [Geopriv] Comments on HELD-03
> >
> > >[AJW] The Location URIs defined originally for HELD would always
> > return the current location of the Target device, these other types
of
> > reference had not really been considered. I believe that for clear
> > implementation guidance we need state what the expected behaviour of
> > the reference is. I would propose therefore text something like the
> > following:
> > >
> > >"The location URI provide the LIS is a current location reference,
and
> > the Target Device should assume that the LIS will determine its
> > location each time the URI is accessed."
> > I don't think this is implementation guidance, so much as deployment
> > guidance
> > and I'm somewhat concerned as a result.  I believe, in particular,
that
> > "the LIS will determine its location each time the URI is accessed"
> > reflects
> > a particular deployment mode.   I think it would be better to say
> > something
> > like
> >
> > "The location URI provided by the LIS is a reference to the most
> > current available
> > reference, and the Target Device should understand that it is not a
> > stable reference
> > to a specific location".
> >
> > To make the reference as current as possible, the LIS may
re-determine
> > a location
> > for the target, but it is possible it will return the freshest
> > available data if it
> > cannot do so or is configured to treat location requests within some
> > time frame
> > able to use previous responses (two dereference request within the
same
> > second, for example).
> >
> > To give a concrete example here, I have in the past made 911 calls
to
> > report
> > cars broken down on the highway.  If I made such a call while at the
> > location,
> > it would be routed to the correct PSAP (since my car and the
disabled
> > vehicle
> > are at the same place).  But if I continue on, my location URI will
get
> > updated
> > with new locations as I move, and a later dereference will give a
> > different
> > location.  We definitely need to make that clear; we may eventually
> > want
> > to add functionality to provide a stable reference to a location,
> > for cases where you want to pass both current and stable.
> >
> > 			regards,
> > 				Ted
> >
> >
> > _______________________________________________
> > Geopriv mailing list
> > [e-mail]
> > https://www1.ietf.org/mailman/listinfo/geopriv

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