What the BSF does
The BSF supports discovery of the correct PCF for a session by storing binding information.
Why binding matters
External or application-related requests need to reach the policy function responsible for the relevant session rather than an arbitrary PCF instance.
Slicing relevance
In multi-instance, multi-slice environments, correct binding helps keep policy actions associated with the right session context.
Standards note: this page is an explanatory summary. Precise procedures, services and information elements are defined in the applicable 3GPP specifications.