YesDR Core Network YACP PFCP GTP YSMP YNRF YAMF YRMF YCRF YNEF YAUSF YNSSF YUDM YPCF YSMF YUPF YSM YBS YUE DN Start YNRF Start YAMF Start YRMF Start YCRF Start YNEF Start YAUSF Start YNSSF Start YUDM Start YPCF Start YSMF Start YUPF Start YSM Start YBS Start YUE Spectrum Report Radio Parameter Request Radio Parameter Assignment Registration Request Authentication Request Authentication Response Registration Accept PDU Session Request PDU Session Accept Downlink Data Transfer SBI YSDAP YPDCP YRLC YMAC YPHY YSDAP YPDCP YRLC YMAC YPHY YAP YAIF YSS YPHY