Introduction

The Binding Support Function (BSF) allows Policy Control Function (PCF) to register, update, and remove the binding information from it, and allows Network Function (NF) consumers to discover the selected Policy Control Function.

The BSF stores the binding information for a certain PDU sessions and discovers the selected Policy Control Function according to the binding information. It also acts as diameter proxy agent or diameter redirect agent to Rx requests targeting an IP address of a UE to the selected Policy Control Function.

For any AF using Rx, such as P-CSCF, the Binding Support Function determines the selected Policy Control Function address according to the information carried by the incoming Rx requests.

The BSF provides a PDU session binding functionality, which ensures that an Application Function (AF) request for a certain PDU Session reaches the relevant PCF holding the PDU Session information. This service:

Allows Policy Control Function users to register, update, and remove the binding information
Allows NF consumers to retrieve the binding information

For more information, see Oracle Communications Cloud Native Binding Support Function User's Guide.