Re: [Geopriv] Confused about draft-polk-geopriv-pidf-lo-4-agps-00.txt

["James M. Polk" <jmpolk at cisco.com>]

At 09:00 AM 7/17/2008, Tschofenig, Hannes (NSN - FI/Espoo) wrote:
> I just ran into
> http://www.ietf.org/internet-drafts/draft-polk-geopriv-pidf-lo-4-agps-00
> .txt and got the impression that this document assumes some sort of
> L7LCP based on SIP.

glad you found it


> Maybe I am completely off base here but does someone attempt to work on
> another L7 LCP beyond HELD?

In LCPs, both ends (the server and the client) know where the client 
is at the end of the transaction. This is true for each LCP to date.

draft-polk-geopriv-pidf-lo-4-agps-00.txt provides the ability of one 
side to get assistance data from the other in determining where the 
endpoint is.

BTW -- draft-polk-geopriv-pidf-lo-triangulation-00 does the same 
thing, but only the LS (as a LIS) does location determination.

SIP is just used here as a transport, because it alone has the 
ability to have persistent (periodic and triggered state information 
transfer) connections.

Only 2 of the 14 SIP Methods are to be used in this proposal 
(SUBSCRIBE and NOTIFY). There is nothing about voice or video or 
instant messaging in this proposal, so relatively, this is a lite 
implementation of SIP.

So, if this is how you define an LCP, then yes, SIP is being proposed 
as a new one, within this limited usage. If you do not define this as 
an LCP, then no, SIP is not being proposed as a new one.

Either way you define this (as an LCP or not), HTTP lacks the ability 
to have or create persistent connections, which at least one other 
SDO (WiMAX) requires for both triangulation and A-GPS data 
transfers.  SIP has this ability - specified in 2002 in RFC 3265, and 
this poses zero new security or privacy concerns relative to Conveyance.

James


> Ciao
> Hannes
>
>
>
> _______________________________________________
> Geopriv mailing list
> Geopriv at ietf.org
> https://www.ietf.org/mailman/listinfo/geopriv

_______________________________________________
Geopriv mailing list
Geopriv at ietf.org
https://www.ietf.org/mailman/listinfo/geopriv