PCRF: Dedicated bearer deletion in PGW (PCEF) scenario

Question

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)

Answer 1

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

Comments

sir u are simply great :)

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What sir, pulling my leg?
Just learning from people like you :)

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No pulling just appreciation :)

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Thanks a lot :)
I am glad I could help

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Thanks a lot Peeyush and Salil for this great forum...