Presence and IntComm WG

[Candace Holman <>]

Thanks Xiaotao.

Thanks for the clarification.  For n PUAs in p2p an update creates n-1 
notifies but in pa an update creates 1 publish plus n-1 notifies.  It 
doesn't count as a reduction because the traffic is only reduced locally, 1 
publish vs n-1 notifies.  It reappears elsewhere in the network.

So, how about the multi-PUA case - if I have x devices/PUAs/accounts for 
one user, and user presence changes, does that send one publish to the pa, 
but in p2p mode it sends x notifies to each watcher/peer?

Candace

At 03:49 PM 5/17/2005, Xiaotao Wu wrote:
> inline.
>
> On Tue, 17 May 2005, Candace Holman wrote:
>
> > In anticipation of this week's conference call, Ben and I have been
> > discussing some of the advantages of using a presence agent over using peer
> > to peer communication.  I question some of the advantages that I came up,
> > so please comment on this list.  Also, please add to this list if you know
> > of additional advantages.
> >
> > 1. Reduced traffic, more scaleable as number of peers rises
>
> I would say 'reduced traffic as number of each user's end devices rises'.
> If every user has only one PUA, there is no traffic reduction (in fact,
> more traffic because the PUA needs to send PUBLISH to the PA).
> In terms of scalability, why a centralized model is more scaleable? In
> fact, if every user has only one PUA, as the number of peers rises, P2P is
> more scalable.
>
> >
> > 2. Reduced access control administration (traffic comes from single source)
> >
> > 3. Synthesized multi-ua information (presence update merging when multiple
> > devices are used by a single presentity)
> >
> > 4. Identity assurance (not strongly authenticated, but some assurance of
> > intradomain identity)
> >
> > 5. Centrally managed contact lists and blacklists (not yet in PIC-SER)
> >
> > 6. Partial presence publishing (not yet in PIC-SER, not sure this has to be
> > centralized either)
>
> Yes, this has to be centralized. Each PUA uses PUBLISH to send its status
> to its PA and the PA do the composing.
>
> Thanks!
>
> -Xiaotao
>
> >
> > Thanks,
> > Candace
> >
> >