Abstract: The present invention is designed so that UL transmission can be made adequately even when transmission of uplink control information using secondary cells (SCells) is made configurable. A user terminal communicates with a radio base station by using carrier aggregation, and has a receiving section that receives a DL signal transmitted from the radio base station, a transmission section that transmits uplink control information that is generated based on the DL signal received, and a control section that controls transmission of the uplink control information, and, in this user terminal, the control section controls the transmission of the uplink control information using an uplink control channel and controls the transmission of the uplink control information using an uplink shared channel in each of a plurality of cell groups, each cell group including at least one component carrier (CC).

Abstract: To provide a radio communication device and a radio communication method that can surely avoid a state that communication cannot be started because of a disagreement in states in an intermediate layer, which is lower to RRC layer, when transitioning between a connected state (RRC-Connected) and a suspended state (RRC-Suspended) in the RRC layer. UE (100) includes a state controlling unit (120) that controls the RRC layer to be in the connected state or the suspended state, and an interruption processing unit (130) that initializes at least a part of states in the intermediate layer, specifically MAC layer/RLC layer/PDCP layer, after the RRC layer has transitioned from the connected state to the suspended state. The state controlling unit (120) causes the RRC layer to resume from the suspended state to the connected state based on the state of the intermediate layer initialized by the interruption processing unit (130).

Abstract: The present invention is designed so that cross-carrier scheduling is carried out adequately even when the number of component carriers that can be configured in a user terminal is expanded compared to that of existing systems. A user terminal can communicate by using six or more component carriers, and has a receiving section that receives downlink control information including a carrier indicator field (CIF); and a control section that controls a receiving process of a downlink shared channel and/or a transmission process of an uplink shared channel in a predetermined component carrier based on the CIF, and the receiving section receives downlink control information including the same CIF value from different component carriers; and the control section determines the predetermined component carrier, considering an offset that is configured to a CIF value of each component carrier that transmits downlink control information including the CIF.

Abstract: A mobile station for performing communication using component carriers which belong to a plurality of base stations includes a reception unit configured to receive configuration information about a scheme of reporting a data amount of uplink data from a base station; a buffer status management unit configured to manage the data amount of uplink data stored in a transmission buffer; a transmission control unit configured to select a base station to which the data amount of uplink data is to be reported according to the configuration information about the scheme of reporting the data amount of uplink data; and a transmission unit configured to report the data amount of uplink data to the selected base station.

Abstract: A terminal that is disclosed includes a receiver that receives one or a plurality of downlink control information (DCI) for scheduling a plurality of Physical Downlink Shared Channel (PDSCH) and a processor that controls reception of the plurality of PDSCH in a cell based on the one or the plurality of DCI. In other aspects, a radio communication method, a base station, and a system are also disclosed.

Abstract: One object is to provide a radio base station and a communication control method that can realize appropriate control on a user device even when a function of an upper layer such as MAC scheduler and a function of a radio physical layer are mounted separately. A communication control method according to the present invention is implemented in a radio base station (200) including a remote device (260) and a central aggregation device (210) and that performs radio communication with a user device (300). The communication control method includes transmitting including the central aggregation device (210) transmitting to the remote device (260) paging information that is information used for performing paging on the user device (300), and performing including the remote device (260) setting a downlink physical channel based on the paging information received from the central aggregation device (210) and performing the paging.

Abstract: A terminal is disclosed that includes a processor that determines a first time unit or a second time unit per frequency band, the first time unit being formed with a symbol having a symbol length in accordance with a first subcarrier spacing and the second time unit being formed with a symbol having a symbol length in accordance with a second subcarrier spacing and being longer than the first time unit. The terminal further includes a receiver that receives a downlink signal by using any of the first time unit and the second time unit that is determined by the processor and a transmitter that transmits an uplink signal by using the first time unit or the second time unit that is determined by the processor. In other aspects, a base station and radio communication method are also disclosed.

Abstract: An object is to realize appropriate HARQ retransmission of the downlink signals even when the function of the upper layer such as the MAC scheduler and the function of the radio physical layer are mounted separately. A radio base station (200) includes a central aggregation device (210) and a remote device (220), and performs radio communication with a user device (300). The remote device (220) includes a receiving unit (223) that receives from the user device (300) a reception response signal that notifies whether a downlink signal is successfully received or not; a generating unit (224) that generates, based on the reception response signal, delivery confirmation information necessary for the central aggregation device (210) to perform retransmission control of the downlink signal; and a transmitting unit (225) that transmits to the central aggregation device (210) the delivery confirmation information.

Abstract: A terminal is disclosed including a processor that adjusts an uplink transmission timing based on granularity relative to a largest subcarrier spacing among subcarrier spacings of a plurality of uplink bandwidth parts in a same timing advance group and based on a timing advance command; and a transmitter that performs uplink transmission according to the uplink transmission timing. In other aspects, a transmission method performed by a terminal is also disclosed.

Abstract: The present invention is designed so that, in a non-stand-alone radio communication system, multiple UL signals of varying RATs are transmitted properly. According to the present invention, a user terminal has a transmission section that transmits both a first uplink (UL) signal of a first radio access technology (RAT) and a second UL signal of a second RAT, or a single UL signal in which the first UL signal and the second UL signal are multiplexed, by using a UL carrier of the first RAT, and a control section that controls frequency division multiplexing and/or time division multiplexing of the first UL signal and the second UL signal in the UL carrier, or multiplexing of the first UL signal and the second UL signal in the single UL signal.

Abstract: UE 200A transmits to gNB 100 channel state information (CSI) and/or reference signal (SRS) by Semi-Persistent method. When a time alignment timer (TA timer) of an uplink transmission expires, the UE 200A retains the radio resources for CSI/SRS transmission, and deactivates the CSI/SRS transmission.

Abstract: A user device is disclosed including a receiver that receives from a first radio base station of a first system a setting information relating to a signaling radio bearer, and a processor that sets, in a dual connectivity between the first radio base station and a second radio base station of a second system, based on the setting information, a Packet Data Convergence Protocol (PDCP) entity of the signaling radio bearer to a PDCP entity of a second system.

Abstract: A network node in a wireless communication system comprising a user equipment and a plurality of network nodes, comprises: a reception unit for receiving from another network node or a user equipment a protocol data unit related to packet transmission that has a possibility of a plurality of data lengths with respect to sequence numbers; an acquiring unit for acquiring a sequence number of the protocol data unit related to packet transmission; and a notification unit for carrying out, based on the sequence number as acquired, notification related to packet transmission.

Abstract: The present invention provides a user equipment in a wireless communication system in which communication is performed using an anchor carrier and a different carrier from the anchor carrier, the user equipment being an NB-IoT terminal, the user equipment comprising: a transmission and reception unit that performs transmission and reception of a message in a random access procedure with a radio base station; and a control unit that configures a carrier signaled from the radio base station to be the different carrier.

Abstract: Provided is a technique for achieving simultaneous communication with a plurality of wireless communication systems using different radio access techniques. An aspect of the invention relates to a user equipment that supports simultaneous communication with a first wireless communication system and a second wireless communication system using different radio access techniques. The user equipment includes a transmitting and receiving unit that transmits and receives radio signals to and from a first base station in the first wireless communication system and a second base station in the second wireless communication system and a capability information notification unit that transmits, to the first base station or the second base station, capability information related to the simultaneous communication with the first wireless communication system and the second wireless communication system.

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 measurement control method in a mobile communication system is provided. The mobile communication system includes a first base station and a second base station which perform communications with a user apparatus by using inter-base-station carrier aggregation. The measurement control method includes a measurement instruction step of determining, by the second base station, a parameter used for measurement configuration information for the user apparatus and transmitting measurement instruction information including the parameters to the first base station; and a measurement configuration information providing step of generating, by the first base station which has received the measurement instruction information, the measurement configuration information in which the parameter included in the measurement instruction information is set, and transmitting the measurement configuration information to the user apparatus.

Abstract: Provided is a radio communication system capable of implementing a state transition related to an intermediate transition between a connected state and an idle state.

Abstract: A central unit (210) acquires, from a user device (300) via a radio resource control layer, UE Capability indicative of a capability of the user device (300). The central unit (210) forwards the acquired UE Capability to a distributed unit (260). The distributed unit (260) holds parameters for controlling radio communication beforehand and receives the UE Capability forwarded by the central unit (210). The distributed unit 260 determines, based on the received UE Capability, content of the parameters according to the content of the UE Capability.

Abstract: To determine an appropriate spatial resource for an uplink control channel. A user terminal includes a receiving section that receives, by a higher layer, a plurality of pieces of spatial relation information related to spatial resources for an uplink control channel, and receives, through a medium access control-control element, indication information indicating at least one piece of spatial relation information associated with at least one uplink control channel resource among the plurality of pieces of spatial relation information, and a control section that determines a partial band to which the indication information is applied, and controls transmission of an uplink control channel in the partial band by using the at least one piece of spatial relation information and the at least one uplink control channel resource.