Sharp Kabushiki Kaisha Corporation

Fg Innovation Company Limited

Tsuyoshi Takakura

Masafumi Aramoto

Yudai Kawasaki

Shuichiro Chiba

Yasuo Sugawara

The present invention provides communication control methods relating to control signal management, a user equipment (UE), and a network node. The method includes transmitting a first initial Protocol Data Unit (PDU) session establishment request message containing a request type field to the network node to establish a first PDU session with a Data Network Name (DNN) and a Single Network Slice Selection Assistance Information (S-NSSAI); receiving a PDU session establishment reject message; setting a request type field contained within a second initial PDU session establishment request message to initial request to establish a second PDU session based on a cause value of the PDU session establishment reject message indicating the first PDU session does not exist; and transmitting the second initial PDU session establishment request message to the network node to establish the second PDU session.

User equipment

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.

User device, control device, and communication control method

A User Equipment (UE) includes a controller configured to, in a case of a failure of a first emergency call connection attempt using Packet Switched (PS) domain, perform a second emergency call connection attempt using the PS domain, and a transmission and/or reception unit configured to receive a Packet Data Unit (PDU) SESSION ESTABLISHMENT REJECT message as the failure of the first emergency call connection attempt. The UE uses a first access network for the first emergency call connection attempt, and the UE uses a second access network for the second emergency call connection attempt. Thus, for a 5th Generation (5G) mobile communication system corresponding to a next generation mobile communication system, a control method is provided that is performed by a user equipment, an access network apparatus, a core network apparatus, and an IMS apparatus to allow the user equipment to connect to a network suitable for an emergency notification service.

UE and communication method for same

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.

User equipment and method for congestion management

A user equipment (UE) with a transmission/reception unit is provided. The UE comprises: when a timer for a Single Network Slice Selection Assistance Information (S-NSSAI) and a Data Network Name (DNN) is operating, the transmission/reception unit initiates an Evolved Packet System (EPS) Session Management (ESM) procedure in the EPS by using a Access Point Name (APN); the APN is same as the DNN; and the transmission/reception unit receives a value of the timer in a Protocol Data Unit (PDU) session establishment reject message.

UE and communication control method for establishing a PDU session in a public land mobile network

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.

User equipment, control device, and communication control method

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. This provides a communication control method in order to implement the terminal apparatus-initiated or network-initiated RQoS control, implement the authentication and/or authorization function by the DN, and implement the management process such as congestion management for each network slice.

User equipment, communication control method of user equipment, core network device, communication control method of core network, SMF, and communication control method of SMF

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.

UE and communication method therefor

A User Equipment (UE) includes a transmitter configured to, in a case that, at a time when a Public Land Mobile Network (PLMN) is changed, a first timer is deactivated for a certain Data Network Name (DNN) and an old PLMN but a second timer is not running for the DNN or a new PLMN and is not deactivated, be capable of transmitting a PDU session establishment request message for the DNN or no DNN in the new PLMN without stopping the first timer. Thus, a communication control method is provided that is used in a case that, in 5G congestion control in which multiple types of congestion control are applied, the PLMN is changed during application of the congestion control.

A User Equipment (UE) includes a transmitter configured to, in a case that, at a time when a Public Land Mobile Network (PLMN) is changed, a first timer is running for a certain Data Network Name (DNN) and an old PLMN but that a second timer is not running for the DNN or a new PLMN and is not deactivated, be capable of transmitting a PDU session establishment request message for the DNN or no DNN in the new PLMN without stopping the first timer for the DNN and the old PLMN. Thus, a communication control method is provided that is used in a case that, in 5G congestion control in which multiple types of congestion control are applied, the PLMN is changed during application of the congestion control.

In a case that a network (NW) applies a plurality of congestion controls, various kinds of congestion control identification information along with a back-off timer (Session Management (SM) timer) are notified such that a terminal apparatus (UE) can apply a congestion control expected by the NW. Alternatively, in a case that the UE receives an NW-initiated SM request with the back-off timer activated, the UE is allowed to identify an SM timer intended by the NW-initiated SM request. Alternatively, in a case that the UE receives the NW-initiated SM request with the back-off timer activated, the UE is allowed to modify the association of the activated back-off timer and the congestion control to be applied. Thus, a communication control method for the terminal to apply the congestion control expected by the NW in the congestion controls applied by the NW in 5G congestion control that applies a plurality of congestion controls is provided.

UE and communication control method for UE

Provided is a User Equipment (UE, terminal apparatus) including a transmission and/or reception unit, wherein in a case that a timer for a combination of Single Network Slice Selection Assistance information (S-NSSAI) and no Data Network Name (DNN) is running, the transmission and/or reception unit is capable of initiating an EPS Session Management (ESM) procedure without using an Access Point Name (APN) in an EPS, and the transmission and/or reception unit receives a value of the timer included in a PDU session establishment reject message.

UE and communication control method

A notification is made of information in one PDU session establishment procedure to a terminal apparatus, the information being associated with information for identifying one NW slice that is a target of congestion control and the information for identifying another NW slice associated, to prevent a PDU session establishment procedure using information for identifying multiple NW slices at a time. As a method for interpreting the information for identifying the other NW slice associated, two implementation schemes are defined that use explicit notifications from a network and rules configured for the terminal apparatus. In a case that NW slice based congestion control is applied, information for identifying the NW slice to which establishment of a PDU session is allowed is notified as an exception. In a case that the terminal apparatus notified of a DCN ID during the 5GS connection moves to the EPS after application of 5GS congestion control, connection to the DCN ID that provides the same service level as the NW slice of the target of congestion control is also prevented. This provides a communication control method for implementing a management processing such as 5G congestion control initiated by a terminal apparatus or a network.

User equipment, communication control method of user equipment, core network device, communication control method of core network, SMF, communication control method of SMF, UPF, and communication control method of UPF

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Sakai, Japan

Tsuyoshi Takakura