Architecture
This section depicts how the network function components interact during an Rx Authorization.
The SMF and PCF have a bilateral communication over the N7 interface. The AF sends an AAR request to PCF. The PCF performs the Rx Authorization of the request by evaluating the message for the missing Media-AVP and consults the value that is assigned to the Bearer-Authorization column in the STG table for the configured status as accept or reject. PCF fetches the STG information from the associated database. PCF communicates the evaluation result to the SMF through a REST request and AF through the outgoing Diameter messages.
The following figure illustrates how the NF interactions happen over the Rx interface.
