This paper discusses how to allow users to use the 5 G SA network in a non-registration" fashion.We adopt a joint PCRF/PCF/OCS discovery mechanism

identify a user’s IMEI information from attach

registration signaling and charging online request

compared with the 5 G SA terminal DB

judge whether the user is using a 5 G SA terminal

capture when the user changes device in realtime

identify the trigger points of 5 G plan initialization

realize 5 G SA terminal discovery under different networking scenarios

lockdown 5 G target users in a timely

accurate fashion with few omissions.