Abstract: A User Equipment (UE) includes a transmission and reception unit, a storage unit, and a controller, in which the transmission and reception unit is configured to receive Allowed Network Slice Selection Assistance Information (NSSAI) and one or more first mapped Single Network Slice Selection Assistance Information (S-NSSAI) for the Allowed NSSAI, and unless the storage unit stores an S-NSSAI associated with second mapped S-NSSAI in rejected NSSAI and the second mapped S-NSSAI is not included in the one or more first mapped S-NSSAI for the Allowed NSSAI, the controller removes an S-NSSAI included in the Allowed NSSAI from the rejected NSSAI stored in the storage unit.

Abstract: A unit is provided through an application of a disaster condition to a PLMN in 5GS, the unit being for transmitting and/or receiving a notification in a case that a communication service cannot be provided to a UE and for selecting a roaming destination PLMN by the UE. Provided are a procedure to allow the UE to recognize a state of a certain PLMN and transmit and/or receive information for appropriately selecting a PLMN as a moving destination in a case that a disaster condition applies or no longer applies to the certain PLMN, a method of selecting a PLMN based on information received and stored by the UE through a notification from the PLMN or the like, and a communication unit.

Abstract: A User Equipment (UE) includes transmission and reception circuitry, and a controller, wherein while one or more Tsor-cm timers are running, and upon receiving a new Steering of roaming connected mode control information (SOR-CMCI), the controller sets a Tsor-cm timer value for an associated PDU session or service to a timer value in the new SOR-CMCI.

Abstract: In a case that user equipment (UE) that has established a communication path for direct C2 communication receives, from a network, a PDU session release command message for revoking authentication and/or authorization of the communication path for the direct C2 communication or a PDU session modification command message, the UE can indicate an appropriate cause value in the procedure of releasing the communication path for the direct C2 communication.

Abstract: A unit is provided through an application of a disaster condition to a PLMN in 5GS, the unit being for transmitting and/or receiving a notification in a case that a communication service cannot be provided to a UE and for selecting a roaming destination PLMN by the UE. Provided are a procedure to allow the UE to recognize a state of a certain PLMN and transmit and/or receive information for appropriately selecting a PLMN as a moving destination in a case that a disaster condition applies or no longer applies to the certain PLMN, a method of selecting a PLMN based on information received and stored by the UE through a notification from the PLMN or the like, and a communication unit.

Abstract: A User Equipment (UE) includes a controller. The controller is in automatic network selection mode, and the controller stops a Tsor-cm timer in a case that the controller switched to manual network selection mode and the Tsor-cm timer is running.

Abstract: This user equipment (UE) is characterized by comprising a transmit/receive unit and a storage unit, wherein, if, during non-roaming, the transmit/receive unit has received Single Network Slice Selection Assistance Information (S-NSSAI) included in rejected NSSAI included in Extended rejected Network Slice Selection Assistance Information (NSSAI) IE, the S-NSSAI is deleted from allowed NSSAI stored in the storage unit, wherein the rejected NSSAI is rejected NSSAI with respect to a current Public land mobile network (PLMN) or Stand-alone Non-Public Network (SNPN), or is rejected NSSAI with respect to a current registration area.

Abstract: A User Equipment (UE) includes a transmission and/or reception unit and a storage unit. During roaming, in a case that the transmission and/or reception unit receives Single Network Slice Selection Assistance Information (S-NSSAI) included in rejected Network Slice Selection Assistance Information (NSSAI) included in an Extended rejected NSSAI IE, one or more mapped S-NSSAI for the S-NSSAI included in allowed NSSAI are stored in the storage unit, and the Extended rejected NSSAI IE includes all of the one or more mapped S-NSSAI, the S-NSSAI is removed from the allowed NSSAI stored in the storage unit, and the rejected NSSAI is rejected NSSAI with respect to a current Public land mobile network (PLMN) or Stand-alone Non-Public Network (SNPN) or rejected NSSAI with respect to a current registration area.

Abstract: A User Equipment (UE) includes a transmission and/or reception unit and a storage unit. During non-roaming, in a case that the transmission and/or reception unit receives Single Network Slice Selection Assistance Information (S-NSSAI) included in rejected Network Slice Selection Assistance Information (NSSAI) included in an Extended rejected NSSAI IE, the S-NSSAI is removed from pending NSSAI stored in the storage unit, and the rejected NSSAI is rejected NSSAI with respect to a current Public land mobile network (PLMN) or Stand-alone Non-Public Network (SNPN) or rejected NSSAI with respect to a current registration area.

Abstract: Provided is a communication procedure for data transmission and/or reception suitable for a Network Slice and a DeCOR. One or a plurality of Network Slices are included in a core network managed by the network operator, the Network Slice is configured of one or a plurality of Network Functions, and based on registration information of a terminal apparatus or a request of the terminal apparatus, the terminal apparatus performs processing to connect to the one or the plurality of Network Slices corresponding to a service or an application. Furthermore, based on an authentication result from the network, the terminal apparatus performs processing to connect to a supplemental Network Slice.

Abstract: In a 5GS, a communication unit is provided that is intended to implement functions related to management of information regarding a network slice. In the 5GS, a method and a communication unit are provided for initial registration of UE and for a periodic registration procedure or a registration procedure based on movement for achieving management of information regarding network slices. Furthermore, a method and a communication unit are provided for a network slice-specific authentication and/or authorization procedure, and a UE configuration update procedure, and a de-registration procedure after completion of a registration procedure.

Abstract: In a communication system constituting a first core network and a second core network, a location management device deployed in a first core network initiates a switching procedure between the core networks. In the switching procedure, the second core network is selected by MME selection of a base station device, allowing a terminal device to connect to the second core network. This configuration provides a communication control method and the like for enabling a terminal device to switch between core networks in a communication system in which multiple core networks are overlaid.

Abstract: A User Equipment (UE) includes a transmission and reception unit, a controller, and a storage unit. The transmission and reception unit receives allowed Network Slice Selection Assistance Information (NSSAI). The controller deletes mapped Single Network Slice Selection Assistance Information (S-NSSAI) of the allowed NSSAI from rejected NSSAI stored by the storage unit.

Abstract: A User Equipment (UE) includes a transmission and reception unit, a controller, and a storage unit. The transmission and reception unit receives allowed Network Slice Selection Assistance Information (NSSAI). In a case that the UE is roaming, the controller deletes mapped Single Network Slice Selection Assistance Information (S-NSSAI) of the allowed NSSAI from pending NSSAI stored by the storage unit.

Abstract: A communication system implemented providing a service based on ProSe under the management of a network operator. Processing based on a discovery request procedure for discovering a proximity terminal is performed based on authentication of a server device operated by the network operator. In addition, the network operator updates the processing based on the discovery request procedure in accordance with a policy of the network operator.

Abstract: Communications control in response to establishment of a multi-access PDN connection or with rejection of establishment of a multi-access PDN connection is performed based on a response to a PDN connectivity establishment request from a terminal device. This provides a method of communication control and the like in response to a multi-access PDN connectivity establishment request from the terminal device.

Abstract: Provided are procedures for initial UE registration and periodic or movement-based registration, and a communication unit to achieve management of the maximum number of UEs connected to each slice in 5GS. Furthermore, a method for managing a timer running after completion of the registration procedure, and a method of registration procedure and a communication unit for both a UE in which the timer is running and a UE in which the timer is not running are provided, thus providing a communication unit to implement functions related to the management of the maximum number of UEs connected to each slice in 5GS.

Abstract: Provided are procedures for initial UE registration and periodic or movement-based registration, and a communication unit to achieve management of the maximum number of UEs connected to each slice in 5GS. Furthermore, a method for managing a timer running after completion of the registration procedure, and a method of registration procedure and a communication unit for both a UE in which the timer is running and a UE in which the timer is not running are provided, thus providing a communication unit to implement functions related to the management of the maximum number of UEs connected to each slice in 5GS.

Abstract: A procedure for initial registration of a UE and a procedure for periodic registration or registration based on movement, and a communication means are provided which are used to implement Network Slice Specific Authentication and Authorization in 5GS. Furthermore, by providing the Network Slice Specific Authentication and Authorization initiated by a network, a procedure for changing UE configurations initiated by the network, the procedure being initiated based on completion of the Network Slice Specific Authentication and Authorization, a de-registration procedure initiated by the network, and a communication means, a communication means is provided that is used to implement functions related to the Network Slice Specific Authentication and Authorization in the 5GS.

Abstract: According to an aspect of the present invention, provided are a procedure and a communicator for initial registration of UE or periodic or mobility-based registration for achieving Network Slice Specific Authentication and Authorization in 5GS. Furthermore, a communicator for achieving a function related to Network Slice Specific Authentication and Authorization in 5GS is provided by providing Network Slice Specific Authentication and Authorization initiated by a network, a procedure, initiated by the network and initiated based on completion of the Network Slice Specific Authentication and Authorization, for changing a UE configuration, a de-registration procedure initiated by the network, and a communicator.