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| Applicable Products or Functional Area | 5G-PCF |
| Applicable Platform(s) | SMI |
| Feature Default Setting | Disabled – Configuration Required |
| Related Changes in this Release | Not Applicable |
| Related Documentation | Not Applicable |
| Revision Details | Release |
|---|---|
| First introduced. | 2020.01.0 |
PCF is equipped to retrieve the event triggers from the SMF by sending the N7 Notify Request. Certain features such as Rx bearer authorization, QoS derivation, and rule evaluation rely on specific event triggers such as RAT-Type and AccessType for taking the appropriate action. For instance, the RAT-Type event trigger lets you determine the Radio Access Technology (RAT) that is serving the User Equipment.
Typically, PCF does not subscribe to all the event triggers during the session initiation using N7 Create. If the features are dependent on specific event triggers and PCF did not subscribe to them, then PCF does not fetch the values associated with those events. With the dummy N7 Notify Request, you can send an intermediate request to fetch the event triggers corresponding to the configured Media-Type which is specified in the AAR message from the IMS.
In the Dummy N7 Notify Request feature, the PCF interactions happen in the following sequence:
The SMF sends an N7 Create Request to PCF. The PCF responds to this request with the configured event triggers.
When IMS initiates multimedia calls containing the AAR message with the Media-Type, PCF initiates an N7 Notify Request to assign the PCC rules that are evaluated based on the media details received in the AAR message. However, in some situations PCF cannot compute the rules as it did not subscribe to the specific event triggers such as RAT-Change and AccessType AVP.
The PCF attempts to determine the corresponding event trigger from the SMF by sending an intermediate (dummy) N7 Notify Request to SMF.
The SMF responds with the applicable event triggers that are specified in the dummy N7 request.
The PCF uses these triggers to compute the PCC rules and transmits it to the SMF in the subsequent N7 Notify Request.
This section describes how to configure the dummy Notify Request through which PCF retrieves the triggers for the AAR messages with Media-Type.
The configuration of the proxy N7 Notify Request involves the following steps:
Creating the STG for the N7 Notify Request
Configuring the Dummy N7 Notify Parameters
Configuring the Event Triggers
This section describes how to create the STG N7 Notify request which is referred by the CRD.
Log in to Policy Builder.
Click the Reference Data tab, and from the left pane click Custom Reference Data Tables to view the options.
On the left pane, click the Search Table Groups folder. A default folder is created under the Search Table Groups folder.
Expand the default folder and select the table icon to view the Custom Reference Data Table parameters on the right pane. A default STG is created under the Search Table Groups folder.
Enter the parameters in the Custom Reference Data Table pane. Rename the CRD with a unique name.
Navigate to the Column field and click Add. In the Columns pane, click the row to enter the Name, Display Name, and Type. Select the Use In Condition, Key, and Required check box.
Specify a row for the Media-Type and a row for the event triggers that you want to fetch.
The event triggers row does not require the Use In Condition, Key, and Required check box to be selected.
Save and publish the changes.
This section describes how to configure the dummy N7 Notify event trigger parameters through the PCF Central.
Log in to PCF Central.
Select the Custom Reference Data.
In the Custom Reference Data Tables pane, click the table that you have created in Creating the STG for the N7 Notify Request.
In the dialgox box, click Add Row to include the Media-Type and event trigger. The information is populated based on the configured STG table.
Click Done to save your changes.
This section describes how to subscribe to the N7 event triggers through the dummy N7 Notify request.
Log in to Policy Builder.
Click the Reference Data tab.
In the left pane, click Diameter Defaults > Rx Profiles.
In the Rx Profiles Summary pane, under Create Child, click Rx Profile.
On the left pane, select Rx Profiles > default. In the Rx STG lookup binding pane, rename the default profile name.
In the Stg Reference field, click select to select the STG table that you have configured.
In the List Of Input Column Avp Pairs section, click Add.
Click the row in the Avp Name to specify the media type.
In the Column column, hover the cursor on the first row to click the ellipsis (...) and select the media type that you specified in the STG. For more information, see Creating the STG for the N7 Notify Request.
In the List Of Output Column Avp Pairs section, click Add.
Click the row in the Avp Name to specify the event trigger.
In the Column column, hover the cursor on the first row to click the ellipsis (...) and select the event trigger that you specified in the STG. For more information, see Creating the STG for the N7 Notify Request.
In the left pane, navigate to the Diameter Client > Summary. In the Summary pane, click the Rx Client > default.
In the Rx Client pane, navigate to Request Gx RAA for Event-Triggers section and select the check box in the corresponding row.
In the Rx CRD AVP name to extract Event-Triggers section, click Add.
In the Add Values dialog box, add the triggers. Specify the same values that you have entered for the Diameter Defaults parameters.
The events in the list are populated based on the values of the CRD table (dummy notify table). The input columns of the CRD table are associated to the Rx media details such as Media-Type, and the output columns indicate the event trigger numbers that are to be subscribed or enabled on the SMF.
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