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Diameter correlation over multiple Interfaces

+2 votes

In case of multiple OCS node with multiple PCRF/PCEF how correlation happen over multiple interface? i.e. how a user call terminate on a specific node.

posted Aug 30, 2013 by Luv Kumar

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1 Answer

+1 vote

Luv, not sure if I understand the question correctly. If you, by different interfaces, mean Gx, Rx etc (ie, interface between P-GW and PCRF, AF and PCRF etc), then "DRA" (Diameter Routing Agent) function defined in 3GPP specs can identify related sessions on different interfaces and forward them to the same PCRF.
If this is of interest, I can provide more pointers.

answer Sep 2, 2013 by Rathnakumar Kayyar
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+1 vote

From the RFC 6733, it is clear that diameter session is identified bases on session-id, which has to be globally unique. Also in section 2.5 (Connections vs Sessions), its clearly mentioned that one connection can be used to multiplex multiple diameter sessions.

I have following questions related to diameter session -
Is there any implicit correlation between diameter session and origin-host? Does diameter standard allow different requests for the same session to have different origin-host value? Is there any possible problem if the value of Diameter Identity (part of recommended format for session-id) is different from those present in the request (like origin-host/origin-realm)?

+1 vote

Hi all,

We have complexity linked to Gy and Gx interfaces.

Let's say that we have two rules configured as static on PGW with :

Rule1= Reports RatingGroup1
Rule2= Reports RatingGroup2

When PCRF install Rule 1 on Gx, the ratingGroup reported by PGW to OCS is RatingGroup1
When PCRF uninstal Rule1 then install Rule2, the ratingGroup reported by PGW remain RatingGroup1 till a Gy trigger is reached (revalidation time, GSU consumption...).
Then the problem on our system is that when PCRF change the rules on Gx interface the PGW keep reporting the old rating group on Gy interface ie: Gx change do not lead to a Gy change similtanously. I m wondering if there is a standard behaviour for such a use case?

Thanks a lot

+2 votes

Though its a very straight forward question, but none of the place describes the consolidated but crisp list of Diameter Interfaces applicable in LTE. Please help.