Abstract: A user equipment in a radio communication system including the user equipment and a base station, the user equipment including: a transmission unit that transmits a first maximum bandwidth, which is a maximum bandwidth available to the user equipment for communication, to the base station; and a reception unit that receives, from the base station, a center frequency or frequencies on both ends of a band having a bandwidth, which is equal to or less than the first maximum bandwidth, within a band having a second maximum bandwidth that is a maximum bandwidth available to the base station for communication.

Abstract: Provided are a radio communication system and user device that enable smooth interworking in a radio resource control (RRC) layer in the case of implementing interworking between systems by LTE assisted 5G, 5G assisted LTE, or the like. The radio communication system includes an eNB 100 conforming to LTE and a 5G-BS 200 conforming to 5G. The eNB 100 includes an RRC function unit 110 that performs control based on LTE-RRC, which is an RRC protocol in LTE. The 5G-BS 200 includes an RRC function unit 210 that performs control based on 5G-RRC, which is the RRC protocol in 5G. The RRC function unit 210 has at least a function not specified in LTE-RRC.

Abstract: An object of the present invention is to provide a radio communication system and a user device capable of performing appropriate measurement report operations, even during dual connectivity (DC) of LTE (eNB) and NR (gNB). The eNB (100A) includes a first RRC controlling unit that performs control in RRC layer and a first measurement controlling unit that controls reception quality measurement of a target cell performed by the user device. The gNB (100B) includes a second RRC controlling unit that performs control in the RRC layer and a second measurement controlling unit that controls reception quality measurement of a target cell performed by the user device. The first measurement controlling unit shares information on the number of carriers to be measured with the second measurement controlling unit.

Abstract: A base station is provided. The base station includes a first reception unit configured to receive, from a user apparatus included in a mobile communication system including the base station, another base station communicating with the base station, and the user apparatus communicating with the base station, first data including quality information used for scheduling controlling performed by the other base station, and second data different from the first data. The base station also includes a transmission unit configured to transmit the first data to the other base station by giving higher priority to the first data than to the second data.

Abstract: A user equipment in a radio communication system including the user equipment and a base station, the user equipment including: a transmission unit that transmits a first maximum bandwidth, which is a maximum bandwidth available to the user equipment for communication, to the base station; and a reception unit that receives, from the base station, a center frequency or frequencies on both ends of a band having a bandwidth, which is equal to or less than the first maximum bandwidth, within a band having a second maximum bandwidth that is a maximum bandwidth available to the base station for communication.

Abstract: Based on an entering condition for reporting reception quality of a cell via Measurement Report, UE (200) transmits to a radio access network the Measurement Report. The UE (200) judges numberOfTriggeringCell that triggers transmission of the measurement report to the radio access network, and transmits the Measurement Report when the number of neighbor cells that fulfill the entering condition is equal to or more than the numberOfTriggeringCell.

Abstract: A user terminal includes a receiver that receives a downlink shared channel and a processor that obtains a transport block size (TBS) used for the downlink shared channel based on: a TBS index value that is associated with a modulation and coding scheme (MCS) index value used for the downlink shared channel; and a number of resource blocks (RBs) that are allocated to the downlink shared channel. When the downlink shared channel is transmitted by a predetermined transmission scheme and the MCS index value is a predetermined value, the processor modifies the TBS index value associated with the predetermined value and obtains the TBS based on the modified TBS index value and the number of RBs.

Abstract: A technique of promptly implementing appropriate flow control in distributed transmission is provided. An aspect of the present invention relates to a base station serving as a distribution source base station in distributed transmission in which transmission target packets are divided and transmitted from a plurality of base stations to a user equipment, wherein the base station includes a feedback information acquiring unit that acquires radio environment information of a distribution destination base station in the distributed transmission; and a communication control unit that controls the distributed transmission according to the radio environment information.

Abstract: A system for supporting smooth mobility of a mobile terminal apparatus between a plurality of local areas that are arranged in a wide area is disclosed. The system includes a wide area base station apparatus that covers a wide area, a local area base station apparatus that covers a local area arranged in the wide area, and a mobile terminal apparatus that can communicate with the wide area base station apparatus and the local area base station apparatus, and is configured to scramble a data signal and a reference signal by a scrambling sequence that is common between a plurality of local areas in communication between the local area base station apparatus and the mobile terminal apparatus.

Abstract: There is provided user equipment for communicating with a first base station and a second base station, the user equipment including a receiver that receives, form the first base station or the second base station with which an RRC connection is established, a first message indicating to establish a split bearer between the first base station and the second base station; and a communicator that establishes the split bearer between the first base station and the second base station that are reported by the first message, wherein, in the split bearer, a process of a PDCP layer is performed by one of the first base station and the second base station.

Abstract: A user apparatus is provided. The user apparatus is included in a mobile communication system including a first base station, a second base station communicating with the first base station, and the user apparatus communicating with the first base station. The user apparatus includes an obtaining unit configured to obtain from the second base station instruction information indicating an error correction processing operation performed between the first base station and the user apparatus; and a communication unit configured to communicate with the first base station by performing the error correction processing based on the instruction information.

Abstract: Based on an entering condition for reporting reception quality of a cell via Measurement Report, UE (200) transmits to a radio access network the Measurement Report. The UE (200) judges numberOfTriggeringCell that triggers transmission of the measurement report to the radio access network, and transmits the Measurement Report when the number of neighbor cells that fulfill the entering condition is equal to or more than the numberOfTriggeringCell.

Abstract: A technology for realizing an efficient parallelization process in PDCP/RLC layers is provided. According to an embodiment of the invention, a radio communication apparatus includes: a PDCP processing unit configured to perform a process in a PDCP layer; an RLC processing unit configured to perform a process in an RLC layer; and a MAC processing unit configured to perform a process in a MAC layer. The RLC processing unit includes a plurality of RLC entities and the MAC processing unit includes a single MAC entity.

Abstract: A base station is provided. The base station includes a first reception unit configured to receive, from a user apparatus included in a mobile communication system including the base station, another base station communicating with the base station, and the user apparatus communicating with the base station, first data including quality information used for scheduling controlling performed by the other base station, and second data different from the first data. The base station also includes a transmission unit configured to transmit the first data to the other base station by giving higher priority to the first data than to the second data.

Abstract: A user equipment in a wireless communication system that includes a base station and the user equipment, the user equipment includes: a reception unit that receives allocations of radio resources to be used for transmitting uplink reference signals from the base station; a measurement unit that measures reception quality of downlink signals transmitted from the base station; and a transmission unit that starts transmitting uplink reference signals using the radio resources allocated from the base station when the reception quality measured by the measurement unit satisfies a predetermined condition and stops transmission of uplink reference signals when the reception quality measured by the measurement unit does not satisfy the predetermined condition.

Abstract: A technique of promptly implementing appropriate flow control in distributed transmission is provided. An aspect of the present invention relates to a base station serving as a distribution source base station in distributed transmission in which transmission target packets are divided and transmitted from a plurality of base stations to a user equipment, wherein the base station includes a feedback information acquiring unit that acquires radio environment information of a distribution destination base station in the distributed transmission; and a communication control unit that controls the distributed transmission according to the radio environment information.

Abstract: A user equipment in a mobile communication system including a base station and the user equipment, including: a receiving unit that receives a predetermined signaling value which is a signaling value other than a default signaling value and a maximum transmission power value associated with the predetermined signaling value from the base station; and a transmission power control unit that controls transmission power by applying the maximum transmission power value corresponding to the predetermined signaling value when the user equipment supports the predetermined signaling value, wherein the predetermined signaling value is a value which is predetermined as a value common to all bands used in the mobile communication system.

Abstract: Provided are a radio communication system and user device that enable smooth interworking in a radio resource control (RRC) layer in the case of implementing interworking between systems by LTE assisted 5G, 5G assisted LTE, or the like. The radio communication system includes an eNB 100 conforming to LTE and a 5G-BS 200 conforming to 5G. The eNB 100 includes an RRC function unit 110 that performs control based on LTE-RRC, which is an RRC protocol in LTE. The 5G-BS 200 includes an RRC function unit 210 that performs control based on 5G-RRC, which is the RRC protocol in 5G. The RRC function unit 210 has at least a function not specified in LTE-RRC.

Abstract: There is provided user equipment for communicating with a first base station and a second base station, the user equipment including a receiver that receives, form the first base station or the second base station with which an RRC connection is established, a first message indicating to establish a split bearer between the first base station and the second base station; and a communicator that establishes the split bearer between the first base station and the second base station that are reported by the first message, wherein, in the split bearer, a process of a PDCP layer is performed by one of the first base station and the second base station.

Abstract: An adequate transmission rate is guaranteed in a case where “Inter-node UP aggregation” is being performed. In a mobile station according to the present invention, each of MAC layer functions includes a cost management unit configured to manage a cost of an LCH involved in “Inter-node UP aggregation”, a priority management unit configured to manage a priority of the LCH, and a bearer management unit configured to allocate transmission resources to data for the LCH based on the priority and the cost of the LCH. The cost management unit is configured to update the cost of the LCH managed by the cost management unit itself, based on a PBR value informed by a network.