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

Carlos Rodrigues <cmjr@iol.pt> Mon, 20 April 2009 22:27 UTC

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Date: Mon, 20 Apr 2009 23:28:43 +0100
From: Carlos Rodrigues <cmjr@iol.pt>
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Cc: mobopts@irtf.org
Subject: Re: [Mobopts] Same MPA server for 2 access networks
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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@tari.toshiba.com>
To: "Carlos Rodrigues" <cmjr@iol.pt>
Cc: <adutta@research.telcordia.com>om>; <mobopts@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@research.telcordia.com>
>> To: "Carlos Rodrigues" <cmjr@iol.pt>
>> Cc: <mobopts@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@research.telcordia.com>
>>>> To: "Carlos Rodrigues" <cmjr@iol.pt>
>>>> Cc: <mobopts@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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