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

Yoshihiro Ohba <yohba@tari.toshiba.com> Tue, 21 April 2009 04:04 UTC

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Date: Mon, 20 Apr 2009 23:58:59 -0400
From: Yoshihiro Ohba <yohba@tari.toshiba.com>
To: 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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On Mon, Apr 20, 2009 at 11:28:43PM +0100, Carlos Rodrigues wrote:
> Yeah, that helped.
>
> This MPA server will be more a "AAA server", correct?

Yes.

> 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)?

It can be placed where a AAA server is usually located.  When the AAA
server is also used for IMS, then I would say it is placed in the IMS
core.

Regards,
Yoshihiro Ohba


>
> 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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>>>>>
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