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Correlation between Gx and Gy Interfaces (PGW/PCRF & PGW/OCS)

+1 vote
311 views

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

posted Sep 19, 2016 by Mohamed Charif Benabad

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1 Answer

+2 votes

A static rule can be mapped to a particular Rating-Group as in your case. For every Rule PGW should report the same rating-group to OCS as configured against its name.
Ex: There could be static rule which could be used for IMS APN and there could be few used for internet services. Operator would like to charge differently for them.

Standard behavior says same rating-group should be reported to OCS as sent by OCS or configured locally against a static rule.

Regards,
Peeyush Sharma

answer Sep 21, 2016 by Peeyush Sharma
thank you Mr. Peeyush for your feedback.
Could you please show us which TS in 3GPP show this standard.

Thank you in advance,
In order to understand the complete flow you will have to go through 29.212, 32.299, 32.251 and RFC 4006
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+2 votes

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+1 vote

I am going through the 32.299 and trying to figure out the contents of the CCR message.

Section 6.4.2 lists the AVPS in that message, I am looking for how the PCEF sends the "used bytes" to OCS. The "Multiple services credit control" looks like the one. But need some inputs and help on this AVP. Or please correct me if I am wrong.

+2 votes

This regarding the sessions b/w the PGW and PCRF.

Lets say we have 2 default bearers(DEF1, ad DEF2) for UE1, and 2 dediicated bearers for each of these Default bearers. And for UE2 assume 2 def bearers, DEF3, and DEF4.

Now a CCR is sent for initial default bearer DEF1 creation for UE1. Lets say session(session1) is created for this. with CCRequest number=0.
For Ded bearer1 creation, will it use the same session Id ? and increment the CCRNumber ?
What about the UE2?

I am new to Diameter and earlier, these things were internal and didnot need diameter interface. So the questions are arising.

+2 votes

Hi,

I am going through the spec 3gpp 29.219(Sy interface) and trying to understand the call flow and AVPS between the OCS and PCRF.

The PCRF sends the the list of Policy counters to OCS initially and OCS will store it against the Sy session. How does the Counter identifiers be identified uniquely b.w OCS and PCRF ?

Because the spec says, If the OCS determines that any policy counter identifiers are invalid, the OCS shall return a response with the Result-Code AVP set to DIAMETER_INVALID_AVP_VALUE.

But my doubt is, how the Policy counter Ids are known across the OCS and PCRF.

Any help in this area is very helpful

Thanks

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