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

Yoshihiro Ohba <yohba@tari.toshiba.com> Mon, 20 April 2009 21:41 UTC

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Date: Mon, 20 Apr 2009 17:42:26 -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 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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