Does PGW/PCEF tells an IP address of an UE to PCRF during IP-CAN session establishment ??

Question

There is one use case here. PCEF has sent CCR (due to IP-CAN session modify) to PCRF and it again sends CCR to (due to another update) without receiving previous CCA. What should be the behavior ?

Answer 1

That depends on when address assignment takes place. First request from PCEF to PCRF (CCR-Initial) will have IPAddress and/or subscription-id (IMSI/SIP URI/...). Apart from this, there will be the APN (Called Station Id). Based on these, PCRF can identify the session - as well as correlate sessions on other interfaces like Rx.

Comments

Thanks a lot. Your answer helped me to get solved my problem.

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How does the PCRF store the PCC Rules (based on what index). I mean lets say same QOS is applied for two Applications (mapped to SDF1 and SDF2, both mapped to dedicated bearer id 1. So lets say the App related to SDF#1 is stopped. Then PCRF needs to delete PCC Rule related to SDF#1. But the rule is still valid for SDF#2. Any pointers on how this is implemented in PCRF. It will be great if you can give some practical example (with just 1 or two rules in PCRF) . Also what will be sent in the Diameter messages esp in Gx interface...