How it Works

The SMF sends the N7 Create Request to PCF. PCF then sends the query to LDAP to find the subscriber profile. The LDAP notifications from the LDAP client are supported in the following way:

  1. For any changes in a subscriber profile, PCF receives an LDAP notification. PCF then sends a requery to find the updated subscriber profile.

  2. On receiving the LDAP notification, PCF sends the N28 Subscribe Update on the Charging Function (CHF). PCF sends this update to receive the updated status of policy counters for the policy that the subscriber has subscribed.

  3. After reevaluating the counters that PCF receives from CHF over the N28 interface, if policy has changed, then SMF is updated with the Update Notify message over the N7 interface.