Abstract: A terminal includes: a reception section that receives adjustment information for adjusting a communication timing based on a reference time; and a control section that controls a granularity of adjusting the communication timing according to a size of the adjustment information.

Abstract: The present invention is designed so that multiple UL signals of varying RATs are transmitted properly in non-stand-alone radio communication systems. A user terminal has a transmission section that transmits a first uplink (UL) signal of a first radio access technology (RAT) and a second UL signal of a second RAT, at different times, and a control section that controls switching between a first time, which is used to transmit the first UL signal using a first UL carrier of the first RAT, and a second time, which is used to transmit the second UL signal using a second UL carrier of the second RAT.

Abstract: A terminal is disclosed that includes a receiver that receives a downlink (DL) signal transmitted from each of a plurality of component carriers (CC) in dual connectivity and a processor that makes measurement of the DL signal based on a measurement requirement. The terminal further includes a first measurement requirement of a first secondary CC to which listening before transmission is applied is different from a second measurement requirement of a second secondary CC to which the listening before transmission is not applied.

Abstract: A terminal is disclosed for performing communication in dual connectivity, the terminal comprising a transmitter that performs a first communication with a first base station and performs a second communication with a second base station; and a processor that starts or restarts a data inactivity timer when data reception occurs at a first MAC (Media Access Control) entity associated with the first communication, and starts or restarts the data inactivity timer when data reception occurs at a second MAC entity associated with the second communication. In other aspects, a radio communication system and a communication method are also disclosed.

Abstract: A user apparatus that communicates with a base station apparatus is provided. The user apparatus includes a reception unit configured to receive, from the base station apparatus, an indication for an individual random access preamble, information indicating correspondence to non-contention based random access procedure, and a random access response; a transmission unit configured to transmit the individual random access preamble to the base station apparatus; and a control unit configured to, in response to receiving the random access response to the individual random access preamble, the random access response being transmitted from the base station apparatus, determine whether the random access procedure has been successfully completed based on the information indicating correspondence to the non-contention based random access procedure.

Abstract: A base station includes a receiving unit that receives, from an external system, a reference time of the external system; a control unit that generates, based on the reference time of the external system, association information for a user equipment to calculate the reference time of the external system to which the user equipment belongs; and a transmitting unit that transmits the association information to the user equipment.

Abstract: A user equipment includes a reception unit configured to receive an instruction for packet duplication from a base station apparatus; a control unit configured to determine, based on the instruction for packet duplication, a primary RLC (Radio Link Control) and a plurality of secondary RLCs to be used with respect to packet duplication; and a communication unit configured to apply packet duplication to all or a part of the determined primary RLC and plurality of secondary RLCs and perform communication.

Abstract: A user equipment includes a control unit configured to determine, based on a difference between a first timing advance value of a first cell group in dual connectivity and a second timing advance value of a second cell group in the dual connectivity, a transmission timing for the first cell group and a transmission timing for the second cell group, and a transmitting unit configured to perform transmission in the first cell group based on the determined transmission timing for the first cell group, and perform transmission in the second cell group based on the determined transmission timing for the second cell group.

Abstract: Provided is a terminal that includes a reception section which receives adjustment information for adjusting a communication timing that is based on a reference point in time, and a control section which determines a specific timing for receiving the adjustment information.

Abstract: A device is disclosed that is used as a first device in a radio communication system including the first device, a second device communicating with the first device, and a user equipment communicating with the first device. The device includes a processor being configured to acquire from the second device, a plurality of parameters used for an initial cell setting, the plurality of parameters including at least one of: information indicating a center frequency, a bandwidth and a duplex mode of a cell, a physical cell ID, information related to a master information block (MIB) for the initial cell setting, information related to a system information block (SIB) for the initial cell setting, and maximum transmission power. Additionally, the first device is a remote radio unit and the second device is a central unit. Further, the first device performs a predetermined layer function. In another aspect, a method is disclosed.

Abstract: When RRC connection release in a radio resource control layer reaches UE (200A), gNB-DU (110) transmits UE CONTEXT RELEASE COMPLETE of the UE (200A) to gNB-CU (120). The gNB-CU (120) releases a context allocated to the UE (200A) based on the UE CONTEXT RELEASE COMPLETE.

Abstract: A user apparatus and a control information detection method executed by a user apparatus are disclosed. The user apparatus includes a memory that stores a preamble and identification information of the user apparatus; a processor that detects control information, addressed to the user apparatus, by monitoring a candidate area of a common candidate area where a plurality of user apparatuses commonly perform monitoring and an individual candidate area for the user apparatus; and a transmitter that transmits the preamble to a base station. The processor monitors, during a period when the user apparatus monitors a random access response, the individual candidate area using the identification information of the user apparatus to detect control information that is scrambled by the base station using the identification information of the user apparatus.

Abstract: Provided is a communication system that can sustain a reduction in delay in FFT/IFFT processing by code blocking user data, even in a case where the functions of upper layers such as a MAC scheduler and the function of the radio physical layer are implemented separately. In a radio base station (communication system) including a central aggregation device 210 and a remote device 220, the central aggregation device 210 transmits code blocks in a number necessary for generating an OFDM symbol as a piece of data to the remote device 220, the code blocks being produced by dividing user data into units of encoding processing.

Abstract: UE (100) sets a single transmission timing in simultaneous communication performed between a user equipment (100) and a plurality of radio base stations (200a, 200b). The UE (100) transmits an uplink signal to the plurality of radio base stations (200a, 200b) by using the single transmission timing.

Abstract: A terminal is disclosed that includes a receiving section that receives downlink control information (DCI) and a control section that assumes that scheduling of 1 ms Transmission Time Interval (TTI) length in a first CC is performed based on DCI that is received in 1 ms TTI length of a second CC that is different from the first CC and is not performed based on DCI that is received in TTI length shorter than 1 ms of a third CC that is different from the first CC. In other aspects, a radio communication method for a terminal and a radio base station are disclosed.

Abstract: Provided is a base station used as a first base station in a radio communication system including the first base station, a second base station communicating with the first base station, and a user equipment communicating with the first base station. The base station includes: an acquiring unit that acquires a plurality of parameters used for an initial cell setting; and a setting unit that performs a cell setting using the acquired plurality of parameters.

Abstract: User equipment of a radio communication system including a base station that performs communication using a maximum bandwidth which is a largest bandwidth available for communication and the user equipment in which a largest bandwidth available for communication is equal to or less than the maximum bandwidth, the user equipment including a receiver unit configured to receive a radio signal transmitted from the base station; and an acquisition unit configured to acquire a radio resource of a master information block corresponding to a synchronization signal, a radio resource of a system information block, and a radio resource of a paging channel, wherein the receiver unit monitors the radio resource of the synchronization signal, the radio resource of the master information block, the radio resource of the system information block, or the radio resource of the paging channel, when the user equipment is in an RRC idle mode.

Abstract: A terminal includes a receiver configured to receive a Timing Advance command; and a controller configured to control a timer related to uplink time alignment, wherein, in response to receiving the Timing Advance command by the receiver, the controller starts the timer, and wherein, upon receiving, by the receiver, a contention resolution message, the controller stops the timer after a time period from the reception of the contention resolution message.

Abstract: A user apparatus includes an information storage unit configured to store band combination information indicating a combination of bands that can be used in carrier aggregation in the user apparatus, and a notification control unit configured to explicitly or implicitly add, to the band combination information, capability information indicating whether the user apparatus is able to set a primary cell by using a band of a first duplex mode in the carrier aggregation, and to notify a base station of the band combination information to which the capability information is added.

Abstract: UE (200) executes dual connectivity in which it simultaneously connects to a radio base station and other radio base station. The UE (200) includes a transmitting unit (210) that transmits to the radio base station and the other radio base station uplink transmission related information indicating an uplink transmission state, and a control unit (230) that controls transmission or stop of transmission of the uplink transmission related information of a predetermined type.