A method, apparatus, and machine readable non-transitory storage medium for a SDCI pull and push mode optimization are provided, which comprise synchronizing a caching timer and an allowed delay between a Policy and Charging Enforcement Function (PCEF) and a Packet Flow Description Function (PFDF); comparing the caching timer and the allowed delay; and pushing an updated Packet Flow Description (PFD) from the PFDF to the PCEF based on a result of the comparing.