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PCRF: Dedicated bearer deletion in PGW (PCEF) scenario

+3 votes
254 views

Lets say we have a session-0 established for the UE (IPaddress1) for the default bearer. This is when the PGW send the CCRequest(cctype=initial and ccnum=0). Lets say "Policy1" is sent by PCRF in CCA. Does this initial CCRequest has the "Flowdescription" AVP in this ?

Now a dedicated bearer1 is established so CCRequest is sent with (ccrtype =modify and ccnum=1). Lets say PCRF assigns "Policy 2".

Now dedicated bearer 1 is deleted, then what does the PGW send to PCRF ?

Another question: As of now I am storing the list of PolicyRules in PCRF, based on IMSI (IPAddress)..i.e c++ map of IPAddress and PolicyRules. But when the dedicated bearer is removed how do i access the map ? (to find which Policy is deleted)

posted Jul 14, 2015 by Pdk

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1 Answer

+1 vote

First Query

Does this initial CCRequest has the "Flowdescription" AVP in this ?

A. No, there will not be any Flow in CCR-I as through NAS it is not possible for UE to request flow during attach

During UE's request to create a dedicated bearer to update default or dedicated bearer Flows will go in Packet-Filter-Information towards PCRF. PCRF will then take qos and flows requested in Packet-Filter-Information and send CCA with Charging-Rule-Install

Second Query

Now dedicated bearer 1 is deleted, then what does the PGW send to PCRF ?

A. Hoping this request to delete the filters/bearer is from UE side
PGW will send the packet filter ids to PCRF in Packet-Filter-Information and Packet-Filter-Operation as DELETION. Now PCRF will send Charging-Rule-Remove for all the rules mapped to those filters.
PGW on analyzing that all the rules mapped to Ded1 are removed will trigger a Delete Bearer Request to SGW

Query 3

Another question: As of now I am storing the list of PolicyRules in PCRF, based on IMSI (IPAddress)..i.e c++ map of IPAddress and PolicyRules. But when the dedicated bearer is removed how do i access the map ? (to find which Policy is deleted)

A. I am not in develop so could not help much here. Can you rephrase it in simple terms. I'll try to sort something out

Regards,
Peeyush Sharma

answer Jul 15, 2015 by Peeyush Sharma
sir u are simply great :)
What sir, pulling my leg?
Just learning from people like you :)
No pulling just appreciation :)
Thanks a lot :)
I am glad I could help
Thanks a lot Peeyush and Salil for this great forum...
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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 ?

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