Ntt Docomo, Inc.

Kunihiko Teshima

Tooru Uchino

Kazuki Takeda

Hideaki Takahashi

Kei Andou

Satoshi Nagata

Anil Umesh

Hiromasa Umeda

Hiroshi Chin

Daisuke Hiratsuka

Wuri Andarmawanti Hapsari

Sadayuki Abeta

Kengo Yagyu

Takuto Arai

A communication device constitutes a management node that manages at least one of a first base station and a second base station provided on fronthaul. The communication device includes an acquisition unit that acquires a delay profile of the second base station, a control unit that determines a window parameter used to specify at least one of a Reception window and a Transmission window used in the first base station based on the delay profile of the second base station and a delay parameter defined by the fronthaul, and a notification unit that notifies the first base station of the window parameter.

Management node, distributed unit, radio communication system, and radio communication method

An O-RAN distributed unit (O-DU) receives, from an intermediate device provided on a fronthaul, processing time information indicating a processing time in the intermediate device. The O-DU decides capability information set for the intermediate device based on at least the processing time information and transmits the decided capability information to the intermediate device.

Communication device

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.

Flexible use of a band with a bandwidth provided in accordance with capability of a terminal

A user apparatus for use in a mobile communication system including a first base station and a second base station that communicate with the user apparatus by inter-base station carrier aggregation, including: measurement means configured to measure a time difference between a subframe in the first base station and a subframe in the second base station; and notification means configured, when detecting a predetermined notification trigger, to notify the first base station or the second base station of time difference information on the time difference measured by the measurement means.

User apparatus, base station, and time difference information notification method

Provided are a mobile station and a mobile communication method in which, when a secondary cell (SCell) is established in an unlicensed band, received power in the unlicensed band can be efficiently measured and reported to a radio access network. A UE () includes an RSSI measurement unit () that repeatedly measures RSSI in the frequency band of the secondary cell, a report determination unit () that determines, based on an RSSI measurement result, whether to report the measurement result to the radio access network, and a measurement report unit () that reports the measurement result to the radio access network. The report determination unit () determines that the measurement result is to be reported to the radio access network when the measurement result exceeds a predetermined threshold.

Mobile station and mobile communication method

A user device for a radio communication system supports uplink carrier aggregation. The user device includes a transmitter that transmits an uplink signal to a base station by using a first component carrier and a second component carrier having a TTI length shorter than a TTI length of the first component carrier, and a calculator that calculates a lower limit and an upper limit of a maximum transmission power of the uplink signal according to predetermined formulas using one of a subframe of the first component carrier and a subframe of the second component carrier as a reference subframe.

User device, base station, communication method, and instruction method

A user apparatus communicating with a first base station and a second base station in a communication system which supports carrier aggregation is provided. The user apparatus includes a measurement unit configured to measure a timing gap between a reception timing of a first radio signal received from the first base station and a reception timing of a second radio signal received from the second base station; and a transmission unit configured to transmit the information indicating the timing gap measured by the measurement unit to the first base station or the second base station.

User apparatus and base station

A user apparatus configured to communicate with a base station in a mobile communication system that supports carrier aggregation formed by a plurality of cells including a first cell and a second cell that uses a unit time length different from a unit time length of the first cell, including: a reception unit configured to receive downlink data transmitted from the base station in the second cell, and generate transmittal acknowledgement information for the downlink data; and a transmission unit configured to bundle a plurality of pieces of transmittal acknowledgement information, generated in the reception unit, for a plurality of pieces of downlink data into one piece of transmittal acknowledgement information to transmit the bundled transmittal acknowledgement information to the base station in the first cell.

User apparatus and transmittal acknowledgement information transmission method

Techniques are disclosed for controlling carrier aggregation appropriately in a radio communication system having a mixture of harmonic measure equipped user equipments and harmonic measure unequipped user equipments. One aspect of the present invention relates to user equipment having a carrier aggregation function. The user equipment manages requirements regarding transmission and reception characteristics supported by the user equipment for respective combinations of carrier aggregation frequency bands and uses an identifier for identifying a combination of channel bandwidths supported for a combination of inter-band carrier aggregation capable frequency bands to report the requirements as capability information to a base station.

User equipment and capability information reporting method

A user apparatus is provided. The user apparatus performs communications with a base station in a mobile communication system in which at least two carriers with different TTIs are used. The user apparatus includes a gap control unit configured to set a gap that is a period in which the user apparatus does not perform communications with the base station. The gap control unit sets a gap common to a gap set for one of the two carriers as a gap for the other of the two carriers.

User apparatus, base station, and gap configuration method

A user terminal is disclosed including a transmitter that communicates with a first cell group (CG) including a first secondary cell (Scell) and transmits uplink control information using an uplink control channel of the first Scell. The user terminal includes a processor that deactivates the first Scell within a predetermined period from a subframe in which a deactivation command for the first Scell is reported or a subframe in which a deactivation timer applied to the first Scell expires.

User terminal, radio base station and radio communication method for deactivation of scell in a cell group

A terminal is provided. The terminal communicates with a base station in a mobile communication system which supports carrier aggregation provided by a first cell and a second cell which uses a subframe whose time interval is shorter than a time interval of a subframe of the first cell. The terminal includes a calculation unit configured to calculate reporting information to be reported to the base station based on a specific subframe, of a plurality of subframes of the second cell corresponding to a predetermined subframe of the first cell, shared by the base station and the terminal; and a reporting unit configured to report the reporting information calculated by the calculation unit to the base station.

Terminal that transmits reporting information and communication control method of transmitting reporting information in mobile communication system

An object of the present invention is to provide techniques for implementing inter-frequency measurement with flexible small gap measurement corresponding to capability of user equipment and/or to-be-measured cells. One aspect of the present invention relates to user equipment for transmitting and receiving radio signals to/from a base station, comprising: a capability information indication unit configured to indicate capability information of the user equipment to the base station; and an inter-frequency measurement unit configured to perform, upon receiving a small gap measurement applied inter-frequency measurement indication from the base station, a small gap measurement applied inter-frequency measurement in accordance with a small gap period for causing communication with the base station to be interrupted and an inter-frequency measurement period indicated in the inter-frequency measurement indication.

User equipment, base station, and method for indicating inter-frequency measurement to a user equipment from a base station

A user apparatus for use in a mobile communication system, including: determination means configured to determine whether the user apparatus can take both states of a discontinuous reception state and a non-discontinuous reception state at the same time; and measurement control means configured, if it is determined that the user apparatus can take both states of a discontinuous reception state and a non-discontinuous reception state at the same time by the determination means, to determine which measurement condition to use for performing measurement between a measurement condition for when in a discontinuous reception state and a measurement condition for when in a non-discontinuous reception state, and to perform measurement using a determined measurement condition.

User apparatus and measurement control method

A user terminal is disclosed that connects with a plurality of radio base stations and the decrease of uplink throughput is reduced. A user terminal connects with a plurality of radio base stations including a first radio base station and a second radio base station, and this user terminal has a transmission section that transmits uplink signals to each radio base station, a receiving section that receives terminal-specific information with respect to the first radio base station, related to the maximum transmission power of the uplink signals, and a maximum transmission power setting section that sets the maximum transmission power for the first radio base station based on the terminal-specific information with respect to the first radio base station.

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Tokyo, Japan

Kunihiko Teshima