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

[Carlos Rodrigues <cmjr at iol.pt>]

Yeah, that helped.

This MPA server will be more a "AAA server", correct?
And this server needs to be first point first contact point for users  
within the IMS (before P-CSCF), or can be placed in the IMS core (like  
a AS)?

Carlos Rodrigues

----- Original Message -----
From: "Yoshihiro Ohba" <yohba at tari.toshiba.com>
To: "Carlos Rodrigues" <cmjr at iol.pt>
Cc: <adutta at research.telcordia.com>; <mobopts at irtf.org>
Sent: Monday, April 20, 2009 10:42 PM
Subject: Re: [Mobopts] Same MPA server for 2 access networks


> On Mon, Apr 20, 2009 at 07:08:06PM +0100, Carlos Rodrigues wrote:
> > 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?
>
> That's right.  For example, Authentication Agent and Configuration
> Agent placed in each access network can communicate with a centralized
> server such as a AAA server for authenticating MNs as well as
> allocating IP addresses.  You may refer such a centralized server to
> as an "MPA server".
>
> Hope this helps,
> Yoshihiro Ohba
>
>
> > 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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