Abstract: A terminal can control an execution of a conditional handover and an execution of a procedure for an addition/change of a secondary cell, and transmit a radio resource control layer message. When the conditional handover and the procedure for the addition/change are configured simultaneously, or when an execution condition of the conditional handover and an execution condition of the procedure for the addition/change are met simultaneously, the terminal prioritizes either the conditional handover or the procedure for the addition/change according to a state of the message.

Abstract: A base station includes a receiving unit that receives capability information including information indicating a first group consisting of band combinations that can be used only for a specific dual connectivity, and information indicating a second group consisting of band combinations that can be used for the specific dual connectivity in a terminal; a control unit that assigs a plurality of indexes to a corresponding plurality of band combinations of a third group, the third group consisting of the plurality of band combinations consisting of the band combinations of the first group and the band combinations of the second group, so that each band combination of the plurality of band combinations of the third group can be identified; and a transmitting unit that transmits, to another base station, a signal that can be used for communication between the base stations, the signal including the indexes.

Abstract: A radio base station includes: a control unit that controls an execution of a procedure for an addition/change of a secondary cell; a reception unit that receives a first message relating to the secondary cell from another base station; and a transmission unit that transmits a second message including update information of an execution condition of the procedure for the addition/change to another base station when receiving the first message.

Abstract: A terminal according to one aspect of the present disclosure includes a receiving section that receives a configuration indicating that disabling or enabling of a transform precoder for a physical downlink shared channel (PUSCH) is dynamically switched by at least one of downlink control information (DCI) and a Medium Access Control Control Element (MAC CE), and a control section that uses, as a period from reception of the DCI until transmission of the PUSCH, a second period longer than a first period in a case where the waveform is not switched. According to one aspect of the present disclosure, it is possible to easily perform switching of a waveform.

Abstract: A user device comprises a communication unit configured to perform communication to which dual connectivity is applied, wherein a master cell group and a secondary cell group are configured in the dual connectivity, a control unit configured to detect occurrence of a failure in the master cell group, and a transmission unit configured to transmit information related to the occurrence of the failure in the master cell group to a master node of the master cell group, wherein the control unit changes a primary cell to another cell by performing handover to a different RAT (Radio Access Technology).

Abstract: A terminal includes a receiving unit that receives configuration information of a transition destination cell from a gNB by a conditional cell transition in the gNB in which the terminal resides, and a control unit that performs a transition to the transition destination cell based on the configuration information of the transition destination cell, without receiving a transition command. In a case where the receiving unit receives the configuration information of the transition destination cell, the control unit starts a CHO timer and can perform the conditional cell transition before the CHO timer expires.

Abstract: A terminal that communicates simultaneously with a first communication node and a second communication node includes a detection unit that detects a failure in communication with the second communication node; and a transmitting unit that transmits notification including failure information and positional information to the first communication node, the failure information concerning a failure in communication with the second communication node and the positional information being obtained at the time when the failure was detected. In another aspect a communication node is also disclosed.

Abstract: A radio base station includes a first device including a radio communication unit with a terminal, and a second device connected to the first device. The first device is directly connected to a first device of another radio base station using a specific interface. The first device includes a control unit that controls radio communication with the terminal, and a transmission and reception unit that transmits or receives information on the radio communication via the specific interface.

Abstract: A terminal selects a cell supporting a slice in which a network is divided into specific units, or a cell not supporting the slice, and transmits a report including slice related information to the network when the selected cell does not support a requested slice.

Abstract: A terminal includes a reception unit for receiving, from a base station that is a master node, a first message to configure communications with a master cell group and a secondary cell group, a communication unit for performing the communications with the master cell group and the secondary cell group configured that are based on the first message, a control unit for detecting an occurrence of a failure in communications with the secondary cell group, and a transmission unit for transmitting, when the control unit detects the occurrence of the failure in the communications with the secondary cell group, a second message including information indicating the occurrence of the failure in the secondary cell group, wherein the control unit includes location information in the second message when the first message is configured to have information indicating that the location information is to be included in the second message.

Abstract: A terminal includes: a reception unit configured to receive an inquiry related to terminal capability including bands and a parameter from a first base station, the bands being supported by a second base station that performs communication together with the first base station according to DC (Dual Connectivity) and the parameter being supported by the second base station in the bands; a control unit configured to determine the terminal capability corresponding to the bands and the parameter; and a transmission unit configured to transmit a report related to the determined terminal capability to the first base station.

Abstract: A radio base station is disclosed including a first communication device that supports a cell; and a second communication device that is connected to the first communication device and controls the first communication device, wherein the second communication device transmits system information including a reference system frame number and a reference time associated with the reference system frame number to the first communication device, and the first communication device broadcasts the system information. In other aspects, a radio communication method and a radio communication system are also disclosed.

Abstract: An SN (100C) includes a transmitting unit (110b) that transmits, to an MN (100A) to which a terminal (200) is connected, a first message including configuration information of a cell formed by the SN (100C), and a control unit (140b) that determines to delete the configuration information of the cell according to a state of the cell. The transmitting unit (110b) transmits, to the MN (100A), a second message instructing deletion of the configuration information of the cell.

Abstract: A base station includes: a processor that sets a value in a second field when a CG-ConfigInfo message includes the second field other than a first field for a configuration of a terminal, the CG-ConfigInfo message being a request for configuring, modifying, or releasing a cell group of a secondary base station; and a transmitter that transmits the message to another base station. Upon addition and change of the cell group of the secondary base station, the CG-ConfigInfo message mandatorily includes ue-CapabilityInfo, and the ue-CapabilityInfo includes Multi Radio Access Technology dual connectivity (MRDC) capability and New Radio (NR) capability.

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 base station includes a communication unit configured to perform communication with a plurality of terminals through one or more cells, and a control unit configured to perform measurement of the number of active terminals in layer 2 measurement, wherein the control unit measures the number of the active terminals for each cell.

Abstract: A terminal deactivates a secondary cell group according to a state of the secondary cell group. The terminal also transmits failure information of the secondary cell group to a network. When a failure of the secondary cell group in an inactive state occurs, the terminal transmits failure information including an information element indicating a state of cells of the secondary cell group.

Abstract: A network configures different values for a secondary cell identifier assigned to a secondary cell, and a serving cell identifier assigned to a primary secondary cell, the primary secondary cell being a primary cell in a plurality of the secondary cells included in the same cell group, and transmits configuration information including the secondary cell identifier and the serving cell identifier to a terminal.

Abstract: A user device includes a receiving unit configured to receive first information and second information from a base station device, the first information indicating one or more bands that are candidates for a band combination to be supported, the second information indicating which RAT (Radio Access Technology) is to be used; a control unit configured to determine, based on the second information, the band combination to be supported from among the one or more bands included in the first information; and a transmitting unit configured to transmit, to the base station device, is terminal capability information including the determined band combination.

Abstract: A terminal 200 includes a receiving unit 220 that receives a plurality of pieces of configuration information of transition destination cells from a gNB 100A by a conditional cell transition in the gNB 100A in which the terminal 200 resides, and a control unit 250 that performs a transition to a transition destination cell based on configuration information of the transition destination cell, without receiving a transition command. When the receiving unit 220 receives modification information indicating whether there is a modification to the configuration information of the transition destination cell, the control unit 250 modifies the configuration information of the transition destination cell based on the modification information.