Abstract: A user equipment is disclosed including a receiver that receives an RRC message related to configuration information of a second radio base station for a split hearer that splits from the second radio base station toward a first radio base station, and a processor that releases resources related to a radio link of the second radio base station based on the RRC message when a radio link failure in the second radio base station is detected.

Abstract: A terminal (200) configures PCell and SCell simultaneously. The terminal (200) includes a receiving unit (220) that receives a reference signal for use in a detection of a beam failure in the SCell, and a controller (270) that performs a beam failure recovery procedure based on a reception quality of the reference signal. The SCell belongs to a predetermined group regarding the BFR procedure. The controller (270) performs the BFR procedure in a predetermined cell within the predetermined group.

Abstract: User equipment for receiving an instruction to perform a random access procedure from a base station apparatus is provided. The user equipment includes a receiver configured to receive, from the base station apparatus, information specifying available random access channel transmission occasions associated with a synchronization block, a controller configured to identify a random access channel transmission occasion based on the information, and a transmitter configured to transmit a random access preamble by using the identified random access channel transmission occasion.

Abstract: A terminal (200) includes: a receiving unit (220) that receives, from a source gNB (100A), configuration information of a candidate target cell subordinate to a target gNB (100B); and a control unit (240) that performs a procedure for transition to the target gNB (100B) based on the configuration information of the candidate target cell without performing a reestablishment procedure when a radio link failure occurs. The control unit (240) resumes a radio bearer suspended between the terminal (200) and the target gNB (100B) in a case of performing the procedure for transition to the target gNB (100B) based on the configuration information of the candidate target cell.

Abstract: A session management apparatus including: a reception unit configured to receive, from a user plane apparatus, a time offset between a TSN time of a TSN time domain and a 5G time, and identification information of the TSN time domain; and a transmission unit configured to transmit, to a base station apparatus, a TSC assistance information determined based on the time offset and the identification information of the TSN time domain.

Abstract: A terminal is disclosed including a receiving unit that receives, from a source radio base station, information on a candidate cell and a transition condition to the candidate cell; a control unit that performs a synchronization with the candidate cell based on the transition condition and performs a transition to a target radio base station which configures the information on the candidate cell, without transmitting a re-establishment request message, when a radio link failure is detected; and a transmitting unit that transmits a complete message to the target radio base station when the control unit performs the transition to the target radio base station, wherein the control unit includes, in the complete message, information for notifying the radio link failure.

Abstract: A terminal (200) configures PCell and SCell simultaneously. The terminal (200) includes a receiving unit (220) that receives a reference signal for use in a detection of a beam failure in the SCell, a controller (270) that detects the beam failure based on a reception quality of the reference signal, and a transmitting unit (210) that transmits a beam failure recovery request. The controller (270) determines that a BFR procedure is completed when a predetermined condition is satisfied.

Abstract: A terminal (200) configures PCell and SCell simultaneously. The terminal (200) includes a receiving unit (220) that receives a reference signal for use in a detection of a beam failure in the SCell, and a controller (270) that performs at least one of the detection of the beam failure and a beam failure recovery request based on a reception quality of the reference signal. The controller (270) performs at least one of the detection of the beam failure and the beam failure recovery request when a predetermined condition is satisfied.

Abstract: A terminal (200) configures PCell and SCell simultaneously. The terminal (200) includes a receiving unit (220) that receives a reference signal for use in a detection of a beam failure in the SCell, a controller (270) that detects the beam failure based on a reception quality of the reference signal, and a transmitting unit (210) that transmits a beam failure recovery request via a predetermined uplink.

Abstract: A terminal includes a receiver that receives an instruction signal indicating to modify a configuration of a radio link monitoring; and a controller that modifies a parameter used for the configuration of the radio link monitoring in accordance with the instruction signal received by the receiver.

Abstract: A terminal is disclosed including a receiving unit that receives, from a source radio base station, a message which has a list including plural pieces of information on candidate cells and transition conditions associated with the candidate cells, a first transaction ID being included in a piece of information on each candidate cell, and a second transaction ID being included in the message; a control unit that performs, when one transaction condition included in the list in the message is satisfied, a synchronization with one candidate cell associated with the one transaction condition, and performs a transition to a target radio base station which configures one piece of information of the one candidate cell, without receiving a handover command; and a transmitting unit that transmits, to the source radio base station, a first complete message in which the second transaction ID is included, before a start of the synchronization, and transmits, to the target radio base station, a second complete message in w

Abstract: A terminal is disclosed including a receiving unit that receives, from a source radio base station, a first configuration message including information on a candidate cell and a transition condition to the candidate cell; a transmitting unit that transmits, to the source radio base station, a complete message to the first configuration message; and a control unit that performs a modification of the information on the candidate cell and the transition condition to the candidate cell based on a second configuration message received from the source radio base station, after the complete message is transmitted, wherein in a case where the transition condition is satisfied, the control unit performs a synchronization with the candidate cell and performs a transition to a target radio base station which configures the information on the candidate cell, without receiving a handover command.

Abstract: A gNB includes a transmitting unit that transmits, to a source gNB, a first message including configuration information of a cell subordinate to the gNB; and a control unit that determines deletion of the configuration information of the cell depending on a state of the cell. The transmitting unit transmits, to the source gNB, a second message giving an instruction to delete the configuration information of the cell.

Abstract: A terminal (200) includes a control unit (250) that controls to a dormant state in which monitoring of PDCCH is not performed at least in a cell. The control unit (250) suspends transmission of a specific uplink signal using the cell in the dormant state.

Abstract: A terminal is disclosed including a transmitting unit that transmits a request signal for requesting a radio base station to transmit a reference time, to the radio base station; and a receiving unit that receives a radio resource control message from the radio base station according to the transmission of the request signal, the radio resource control message including a reference system frame number and the reference time associated with the reference system frame number. In other aspects, radio base stations, a radio communication method, and a radio communication system are also disclosed.

Abstract: A user equipment includes a transmission unit that transmits a first message to a base station apparatus, the first message including a random access preamble in a two-step random access procedure, a reception unit that receives a second message for contention resolution in the two-step random access procedure from the base station apparatus, and a control unit that determines a transport block size of an uplink shared channel included in the first message based on a parameter associated with communication to the base station apparatus.

Abstract: A user apparatus that performs beamforming-applied communications with a base station apparatus is provided. The user apparatus includes a reception unit configured to receive a beam transmitted from the base station apparatus, a control unit configured to perform control related to recovery of connection to the base station apparatus in a case where the reception unit fails to receive the beam, and a transmission unit configured to transmit a random access preamble or an uplink control signal based on the control related to recovery of connection.

Abstract: User equipment for transmitting an uplink control channel in multiple cells simultaneously in a radio communication system where transmission of the uplink control channel in a secondary cell is supported is disclosed.

Abstract: A user equipment includes a receiving unit configured to receive, from a base station apparatus, information for requesting a report of a User Equipment (UE) capability, a control unit configured to generate the report including a supported UE capability, and a transmitting unit configured to, in a case where an Access Stratum (AS) security with the base station apparatus is activated, transmit the report to the base station apparatus.

Abstract: A UE determines whether or not a gNB different from an eNB to which the UE is connected retains related information indicating a situation of the UE. The UE transmits a connection request with the gNB to the gNB even in a case where the gNB does not retain the related information.