Re: [Mobopts] Same MPA server for 2 access networks

[Carlos Rodrigues <cmjr at iol.pt>]

My question is more about a interworking scenario, more specifically  
inter-technology / intra-domain handover.
Like a 3G-Wifi interworking scenario... we need have these agents in  
each access network but we can have a centralized MPA server, right?

Carlos Rodrigues

----- Original Message -----
From: "Ashutosh Dutta" <adutta at research.telcordia.com>
To: "Carlos Rodrigues" <cmjr at iol.pt>
Cc: <mobopts at irtf.org>
Sent: Monday, April 20, 2009 6:52 PM
Subject: Re: [Mobopts] Same MPA server for 2 access networks


> Carlos,
>        As I just replied to your personal email to me, you can have  
> an AA (Authentication Agent) and CA (Configuration Agent) that are  
> two logical components of an MPA server in the core of the IMS  
> network. These two functions of course can coexist on the same  
> physical box if that is what you are asking for.
>
> Thanks
> Ashutosh
>
> Carlos Rodrigues wrote:
> > These agents need to stay with access network but I can have a  
> > centralized MPA server in the edge of IMS core, no?
> >
> > It is like DNS... we don't have several DNS servers to access to  
> > the Internet. It is done relay...
> >
> > Cheers,
> > Carlos Rodrigues (Computer Science BSc student)
> > ESTG - IPL
> > Leiria, Portugal
> >
> > ----- Original Message -----
> > From: "Ashutosh Dutta" <adutta at research.telcordia.com>
> > To: "Carlos Rodrigues" <cmjr at iol.pt>
> > Cc: <mobopts at irtf.org>
> > Sent: Monday, April 06, 2009 7:55 PM
> > Subject: Re: [Mobopts] Same MPA server for 2 access networks
> >
> >
> > > Carlos,
> > >         Let me repeat some of what I have said earlier to you.
> > > MPA server has several logical components, such as Authentication  
> > > Agent, Configuration Agent, Buffering Agent, Tunneling agent. Some  
> > > of these components could be aggregated for each access network,  
> > > such as Authentication Agent, and Configuration Agent. However,  
> > > part of Configuration Agent needs to stay with each access network  
> > > (e.g., DHCP relay). Buffering Agent and Tunneling Agent usually  
> > > stay at the edges with each access network.
> > >
> > > Thus, it is a design decision as to how you want to split the  
> > > functionality of the MPA server.
> > >
> > > Thanks
> > > Ashutosh
> > >
> > >
> > > Carlos Rodrigues wrote:
> > > > Hi!
> > > >
> > > > I have question about the number of MPA servers necessary in a  
> > > > interworking scenario.
> > > > If I have a scenario with 2 access networks (with different  
> > > > technologies), will need two CA, two AA and two tunneling agents  
> > > > and buffering agents if perform handover from both ways (A to B  
> > > > and B to A), right?
> > > >
> > > > First, I'm trying understand why (can give some tips?);
> > > > Second, it's not possible aggregate these 2 MPA server in a  
> > > > single entity? In a intra domain scenario makes sense.
> > > >
> > > > All help or support will be very helpful.
> > > >
> > > > Cheers,
> > > > Carlos Rodrigues (Computer Science BSc student)
> > > > ESTG - IPL
> > > > Leiria, Portugal
> > > >
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