Re: [Ecrit] Location hiding: Consensus?

[Henning Schulzrinne <hgs at cs.columbia.edu>]

> Issue HR-1 This should not be a requirement. Not all IP address  
> based location determination systems are that accurate.  
> Additionally, giving away course location information should not be  
> required to hide location. Course location information even at the  
> country level is useful commercially. One such example is Google,  
> which uses IP address location determination at the country level  
> to route users to language specific start pages. Access networks  
> should be allowed to charge for location information that is as  
> course as this, since it is a valuable asset on today's Internet. - 
> andy

We are not in the business of creating business opportunities for  
carriers at the expense of others. As long as our main 'customers'  
don't object, it's not our role to make life difficult and less  
debugable for emergency services. Given that GeoMind and others are  
giving away rough location information, the value of such information  
is in doubt in any event.

> Issue 1-3 UAs must now be forbidden from conveying dereferenced  
> location information.

I don't see why. LocationConveyance supports multiple locations.

> Issue 1-4 The semantic difference regarding authorization/ 
> nonauthorization of location information is lost, making it  
> difficult for UAs to know if they truly are not authorized to get  
> true location information. This introduces ambiquity, which should  
> be avoided for emergency situations.

I can't parse this. There is little ambiguity in a 403 Forbidden HTTP  
response, but in any event, the UA without credentials would get  
location, not a refusal, just not with the same accuracy.

> Issue 2a-2 The work around LoST discovery needs to be completed.  
> This is not specific to location hiding.

The issue is that LoST discovery will likely return multiple servers.  
I had earlier pointed out at least three plausible operators (ISP,  
VSP, general public service), provided by several different  
configuration mechanisms. The UA has to use the right one, as things  
will fail otherwise.

Also, from an operator perspective, here the landline ISP has to  
operate a LoST resolver, instead of dumb "return fixed location" server.


http://www.tschofenig.priv.at/twiki/bin/view/EmergencyServices/ 
LocationHiding

On May 4, 2007, at 2:22 PM, Andrew Newton wrote:

> On May 4, 2007, at 1:34 PM, Richard Barnes wrote:
>
> > So, the discussion of location hiding seems to have died down.   
> > Does that mean that we've reached some consensus?  Are we going  
> > with some variant option #1?
>
> I'd appreciate if some of the issues raised were addressed.  See  
> the wiki page.
>
> -andy
>
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