Sy interface related

Question

I have a question regarding the mapping the Policy counter to Bearers.

Does Policy counter relates to subscriber or it relates to services. I mean how the OCS manages the poilicy counter..
And how it maps to bearers

Lets say we have default bearer which is used for the internet browsing and dedicated bearer for voice.

Now lets say we have Policy counter id1 for subscriber 1, which says the "service as Internet" ..And lets say APN-AMBR (for internet is 5 Mbps upto 5GB ) and 2 Mbps for more than 5GB.

Now in the OCS , we configure for
subscriber1:
Policy counterid1: status 5 Mbps upto 5GB and 2 Mbps for more than 5GB.

And on registration, CCR is sent by PGW to PCRF, which inturn sends the SLR with Policy counter id1 with session Id lets say Sysession1

Now the PCRF sends the CCA to PGW with "service type as Internet", Metering method as "volume" and Rating Group some random value. But there is no way to indicate to PGW about the details of counter like on counting 5Mb, it needs to send the CCR-U to OCS. Or lets say on every 2MB PGW indicates to OCS. The Gy session is created for each bearer ? (i.e one for default bearer here and may be another for dedicated bearer related to that..)

On reaching the 5MB limit, the OCS, sends the SNR to PCRF with the Sysession1.

And when the IP CAN is terminated, CCR-T is sent to OCS and also to PCRF by PGW. PCRF inturn sends the STR to OCS.

Now my Q is about a for 2nd APN for the same subsribers, whatabout the Gy and Sy interfaces, are they reused ?

And whatabout the dedicated bearers related to first APN, will they be using the same Gy and Sy interfaces ?

thanks a lot. Any help or any hints in this very helpful for me to correct my understanding and which will correct my code and finally test it !!!

Answer 1

Qouta management is taken care by OCS on Gy interface separately.On Sy interface policy counter status is reported to PCRF at the time of initial attach or if any previous Sy session is there and if any changes happen in the policy counter status for a given policy counter identifier.Now as per your example.when user consumed 5GB den its policy is getting changed to throttled value.It will be indicated by OCS to PCRF on Sy interface in SNR.As far as Gy interface is concerned,In the initial attach,OCS grants some CC-total Octets value and also threshold data.If that threshold data is reached than only PGW will send Update message to OCS. That 5GB may be sent as a threshold value to PGW.

For the 2nd part of your query.I think internet browsing happened on default bearer and dedicated bearer mostly include AUDIO,Video,some high speed messaging and these all things will be taken care by Offline charging System.And it is also operator dependent.Just tell me the what types of traffic is flowing on default and dedicated bearer,than it will be easy for me address Your 2nd part