Abstract: A user device for implementing error handling is provided. The user device comprises a control unit that establishes, in a Protocol Data Unit (PDU) session establishment procedure using a Local Area Data Network (LADN) Data Network Name (DNN), a PDU session for the LADN; and a transceiver unit that prohibits transmission of a PDU session modification request message for the PDU session, in a PDU session modification procedure, based on reception of a specific cause value, wherein the LADN DNN is provided by the user device in the PDU session establishment procedure.

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: 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: The present disclosure provides a user equipment (UE). The UE comprises 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.

Abstract: Provided is a communication unit for implementing error processing of a control device of a core network and error processing of User Equipment in a case that connectivity to a Local Area Data Network (LADN) is not able to be provided in a 5GS. Provided is a communication unit for implementing error processing in which a request for establishing connectivity to a Local Area Data Network (LADN) requested by a user equipment is rejected by a control device of a core network in a case that the connectivity to the LADN is not able to be provided in a 5GS. Further, a communication unit for implementing appropriate error processing that User Equipment performs in a case that a request for establishing connectivity to the LADN is rejected.

Abstract: In a 5G System (5GS), control processing of a control apparatus in a core network and control processing of a User Equipment (UE) in a case that the UE does not store information related to a Non-Public Network (NPN) even though the UE needs to be connected to and registered with the NPN are not clarified. Provided are a communication unit for providing the UE with information of the Non-Public Network (NPN) and control processing in a case that the UE needs to connect to and be registered with the NPN in the 5G System (5GS). Further provided are a communication unit and control processing in a case that provision of the information of the NPN for the UE fails in the 5GS.

Abstract: Provided is, in 5GS, a communication unit for implementing a Vertical LAN. Provided are, in 5GS, a unit for registration of a UE, a session establishment procedure, and generation of a 5GLAN group for implementing the Vertical LAN and a 5GLAN service, a unit for starting communication using the Vertical LAN and the 5GLAN service, and the communication unit. In addition, provided are a unit for modifying a configuration of the UE registered with a network, a unit for managing an established session, a unit for deleting the 5GLAN group, a unit for deleting the UE from the 5GLAN group, and a unit for stopping communication using the Vertical LAN and the 5GLAN service.

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: A procedure in updating information of a connection in associating an Unmanned Aerial Vehicle (UAV) with a UAV controller to establish the connection is not clarified. For the connection for performing communication of the UAV, a user plane resource is to be activated. The UAV updates stored identification information and IP address of the UAV controller, based on reception, from a network, of a PDU session modification command message including identification information and IP address of the UAV controller. The UAV, in a case of establishing a PDU session that provides a QoS flow for performing Command and Control (C2) communication, transmits and/or receives information for establishing an Always-on PDU session to and/or from a network.

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: Provided is, in 5GS, a communication unit for implementing a Vertical LAN. Provided are, in 5GS, a unit for registration of a UE, a session establishment procedure, and generation of a 5GLAN group for implementing the Vertical LAN and a 5GLAN service, a unit for starting communication using the Vertical LAN and the 5GLAN service, and the communication unit. In addition, provided are a unit for modifying a configuration of the UE registered with a network, a unit for managing an established session, a unit for deleting the 5GLAN group, a unit for deleting the UE from the 5GLAN group, and a unit for stopping communication using the Vertical LAN and the 5GLAN service.

Abstract: A terminal apparatus or a device in a core network exchanges capability information for each function in a registration procedure or a PDU session establishment procedure, and in user data communication additional information is added into an uplink packet to implement terminal apparatus-initiated RQoS control, and additional information is added into a downlink packet to implement network device-initiated RQoS control. A dedicated control message and information for an authentication and/or authorization function by a DN are defined to implement the authentication and/or authorization function by the DN. Furthermore, the terminal apparatus and the device in the core network have a timer or a control process for each network slice to implement a management process such as congestion management for each network slice.

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: A terminal apparatus and an apparatus in a core network exchange information indicating maintenance of a PDU session in a procedure for releasing UP resources, and thereby releases the UP resources associated with a specific PDU session while maintaining establishment of the specific PDU session. A terminal apparatus and an apparatus in a core network further exchange information indicating a release of only the UP resources in a procedure for releasing the UP resources, and thereby the terminal apparatus recognizes the release of the UP resources associated with the specific PDU session. In this manner, in order to release the UP resources associated with the specific PDU session while maintaining establishment of the specific PDU session, and to allow the terminal apparatus to recognize the release of the UP resources, a system and a communication control method are provided.

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: A UE receives, from a first base station apparatus, system information and/or a registration accept message including a first frequency band supported by the first base station apparatus, first S-NSSAI corresponding to a first frequency band, a second frequency band supported by a second base station apparatus, and second S-NSSAI corresponding to a second frequency band. The UE recognizes that a registration request message and/or a PDU session establishment request message including the second S-NSSAI is not transmittable via the first base station apparatus, and in a case of reselecting a cell of the second base station apparatus, recognizes that the registration request message and/or the PDU session establishment request message including the first S-NSSAI is not transmittable via the second base station apparatus. This prevents, in a 5 GS, transmission of a registration request message and/or PDU session establishment request message which is unnecessary.

Abstract: Provided is a communication unit configured to allow a function for CIoT to be used even in a 5GS that supports a network-initiated configuration update procedure and a plurality of types of session and service continuities. Further provided is a communication unit configured to appropriately manage, by a user equipment, connection established between the user equipment and a network even in a case that a network-initiated change of a state of the user equipment has been performed. Thereby, the communication unit for implementing the function for CIoT in the 5GS and the communication unit for implementing a network-initiated procedure of changing the state of the user equipment are provided.

Abstract: A User Equipment (UE) includes: a transmitter configured to transmit, in a case that a timer is running for a piece of Single Network Slice Selection Assistance Information (S-NSSAI) at a time when a Public Land Mobile Network (PLMN) is changed, a Protocol Data Unit (PDU) session establishment request message for an identical piece of S-NSSAI in a changed PLMN without stopping the timer. This configuration allows for provision of a communication control method for the terminal to apply congestion managements expected by the network to the congestion managements applied by the network in 5G congestion management to which multiple congestion managements are applied.

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 is a communication unit for implementing functions for URLLC that requires communication of high reliability and/or low latency in the 5GS. Provided is a communication unit for enabling functions for URLLC even in the 5GS that supports a network-initiated configuration update procedure and multiple types of session and service continuity. Further, provided is a communication unit for, in a case that multiple types of functions for URLLC are possible, sharing which function out of the functions for URLLC is available and appropriately managing shared information between a user equipment and a network.