Ue, core network device, and communication control method

A user equipment (UE), comprising:

• at least one of a transmission unit and a reception unit, wherein
• the at least one of the transmission unit and the reception unit receives, from a core network, a protocol data unit (PDU) session establishment reject message including first identification information, the first identification information indicating behaviors of the UE after a first public land mobile network (PLMN) is changed;
• and
• a controller, wherein the controller:
• does not stop, when the first PLMN is changed, a back-off timer for congestion management based on single network slice selection assistance information (S-NSSAI), the back-off timer being activated in the first PLMN;
• and
• determines, based on the first identification information, whether initiation of a procedure for the S-NSSAI in a second PLMN is allowed after the first PLMN is changed.

A communication control method for a user equipment (UE), comprising:

• receiving, from a core network, a protocol data unit (PDU) session establishment reject message including first identification information, the first identification information indicating behaviors of the UE after a first public land mobile network (PLMN) is changed;
• not stopping, when the first PLMN is changed, a back-off timer for congestion management based on single network slice selection assistance information (S-NSSAI), the back-off timer being activated in the first PLMN;
• and
• determining, based on the first identification information, whether initiation of a procedure for the S-NSSAI in a second PLMN is allowed after the first PLMN is changed.