Does OCS have capability to terminate the session

Question

Hi,

this question is related to gy interface. whenever OCS sends terminate or restrict access in the Final unit action avp to GGSN. does ocs convey the message to GGSN to disconnect the session from GGSN side or OCS will disconnect the session .

I mean Does OCS have the authority to disconnect the ongoing online charging session or it always decided on core N/W

Answer 1

Hi Dhinesh,

From RFC-4006 Section 5.4 , It states that "When the end user terminates the service session, or when the graceful service termination described in section 5.6 takes place, the Diameter credit-control client MUST send a final Credit-Control-Request message to the credit-control server. The CC-Request-Type AVP is set to the value TERMINATION_REQUEST. The Service-Context-Id AVP indicates the service specific document applicable to the request."

Also one more scenario If the user logs off during an ongoing credit-control session, or if some other reason causes the user to become logged off (e.g., final-unit indication causes user logoff according to local policy), the service element, according to application specific policy, may send a Session-Termination-Request (STR) to the home Diameter AAA server as usual [DIAMBASE]. Figure 4 illustrates the case when the final-unit indication causes user logoff upon consumption of the final grantedunits and the generation of STR.

 Service Element        AAA Server        CC Server
   End User         (CC Client)
      | Service Delivery  |                    |                    |
      |<----------------->|                    |                    |
      |         :         |                    |                    |
      |         :         |                    |                    |
      |         :         |                    |                    |
      |                   |                    |                    |
      |                   | CCR(Update,Used-Units)                  |
      |                   |------------------->| CCR(Update,Used-Units)
      |                   |                    |------------------->|
      |                   |                  CCA(Final-Unit, Terminate)
      |              CCA(Final-Unit, Terminate)|<-------------------|
      |                   |<-------------------|                    |
      |         :         |                    |                    |
      |         :         |                    |                    |
      |  Disconnect user  |                    |                    |
      |<------------------| CCR(Termination,Used-Units)             |
      |                   |------------------->| CCR(Term.,Used-Units)
      |                   |                    |------------------->|
      |                   |                    |                CCA |
      |                   |                CCA |<-------------------|
      |                   |<-------------------|                    |
      |                   | STR                |                    |
      |                   |------------------->|                    |
      |                   |               STA  |                    |
      |                   |<-------------------|                    |

       Figure 1: User disconnected due to exhausted account

I request you to please refer the diagram from RFC-4006 from Section 5.4 , here I am not able to do proper identation.
Basically it is always Diameter Credit Control Client which may be GGSN or P-GW.

Thanks

Comments

Thanks Buddy