Ntt Docomo, Inc.

Kohei Kiyoshima

Hideaki Takahashi

Tooru Uchino

Hiroyuki Ishii

Kazuaki Takeda

Satoshi Nagata

Wuri Andarmawanti Hapsari

Yuta Sagae

Naoto Okubo

Takahiro Takiguchi

Sadayuki Abeta

Kenichiro Aoyagi

Kazuki Takeda

Yoshihisa Kishiyama

Anil Umesh

Yoshiaki Ofuji

Naoto Ookubo

Kengo Yagyu

Tadashi Uchiyama

Takayuki Isogawa

Tatsuro Yajima

Yoshitsugu Shimazu

Hiroshi Chin

Naoki Nakaminami

Yoshitaka Hiramoto

Masaaki Ohtake

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 () including a remote device () and a central aggregation device () and that performs radio communication with a user device (). The communication control method includes transmitting including the central aggregation device () transmitting to the remote device () paging information that is information used for performing paging on the user device (), and performing including the remote device () setting a downlink physical channel based on the paging information received from the central aggregation device () and performing the paging.

Radio base station and communication control method

A communication device used as a first communication device in a wireless communication system including the first communication device, a second communication device communicating with the first communication device, and a user equipment communicating with the first communication device, includes an acquisition unit configured to acquire a parameter used for performing a random access procedure from the second communication device; and a control unit configured to transmit, in the case of receiving a random access preamble from the user equipment in a random access channel indicated by the parameter, information indicating that the random access preamble indicated by the parameter is received from the user equipment to the second communication device.

Communication device and random access control method

A user apparatus configured to perform communication with a base station in a mobile communication system that supports carrier aggregation, including: transmission means configured to transmit, to the base station, the number of layers for each of component carriers that form the carrier aggregation as information of downlink MIMO capability; and reception means configured to receive, from the base station, the number of layers that is used for determining a bit width of a rank indicator for each of the component carriers that form the carrier aggregation.

User apparatus, base station and information reception method

Based on an entering condition for reporting reception quality of a cell via Measurement Report, UE () transmits to a radio access network the Measurement Report. The UE () 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.

User device and measurement report transmitting method

A base station used as a first base station in a wireless communication system including the first base station, a second base station that communicates with the first base station, and a user equipment that communicates with the first base station includes: a reception unit that receives a parameter used for generating a downlink physical data channel and data to be transmitted toward the user equipment from the second base station; a generating unit that generates the downlink physical data channel by performing processing of Layer 1 on the data using the parameter; and a transmission unit that transmits the generated downlink physical data channel.

Base station and transmission method

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.

User terminal, radio base station, and radio communication method

There is provided a terminal for communicating with a base station apparatus, the terminal including a receiver that receives, from the base station apparatus, instruction information for performing an operation of an error correction process to be executed between the base station apparatus and the terminal, the instruction information including at least one of a process number of a process to be used for the error correction process, a time from receiving a signal until transmitting a reception response, and a timer value indicating a time from receiving the signal until receiving a retransmitted signal; and a processor that executes the error correction process based on the instruction information received by the receiver.

Terminal and communication system

There is provided user equipment of a radio communication system provided with a base station and the user equipment, the user equipment including a reporting unit that reports, to the base station, a band combination supported by the user equipment, a MIMO layer number, and a modulation scheme, and a UE category supported by the user equipment; and a receiver that receives, upon detecting that a maximum bit rate that is achievable by carrier aggregation performed with the band combination supported by the user equipment, the MIMO layer number, and the modulation scheme exceeds a maximum bit rate to be supported by the UE category supported by the user equipment, data from the base station with a bit rate that is less than or equal to the maximum bit rate to be supported by the user equipment under the UE category.

User equipment, base station, and communication method

A mobile station which configures a plurality of component carriers to communicate with a base station is discloses herein including a reception unit configured to receive from the base station a gap pattern according to which a portion of an inter-frequency measurement duration is used for data communication and a communication control unit configured to control communication according to the gap pattern.

Mobile station, base station, and communication control method

The present invention is designed so that mismatches in the recognition of TPC command-accumulated values between a radio base station and a user terminal are resolved in a simple way. The user terminal of the present invention provides a user terminal that transmits uplink channels, and that has a receiving section that receives transmission power control (TPC) commands from each of a plurality of cells that are grouped, a control section that controls the uplink channel transmission power of each of the multiple cells based on accumulated values of the TPC commands, and, when a reset condition is fulfilled in one of the multiple cells, the control section resets the accumulated values of all of the multiple cells.

User terminal, radio base station and radio communication method

A user apparatus configured to perform discontinuous reception control for discontinuously receiving a signal transmitted from a base station, including: a reception unit configured to receive information, from the base station, specifying a transmission cycle of a control signal in discontinuous reception performed at a predetermined discontinuous reception cycle; and a transmission control unit configured, when performing the discontinuous reception at the predetermined discontinuous reception cycle, to transmit the control signal in an active period in the discontinuous reception at a cycle longer than the discontinuous reception cycle based on the information specifying the transmission cycle.

User apparatus and signal transmission control method

Even in the case of satellite communications to which LTE is applied, a difference between reception timings of uplink singles transmitted from a plurality of mobile stations UE located in the same cell is kept within GI specified in LTE. A mobile station UE#according to the present invention includes: an offset calculation unitconfigured to calculate an offset &#x3b4; from a transmission timing to be referenced, based on a distance Lbetween the mobile station UE#and a satelliteused in satellite communications, and a distance Lbetween the satelliteand a reference mobile station UE; and an RACH functional unitconfigured to adjust a transmission timing of a random access preamble based on the calculated offset &#x3b4;.

Mobile station

To execute appropriate process when 'Time-Switched UL CA' is executed and even when transmission of uplink information using a plurality of CCs has been scheduled in a same TTI. A radio base station eNB according to the present invention includes a UL transmission processing unitconfigured to transmit uplink information at TTI#n+4 using a CC allocated over a PDCCH to the mobile station UE at TTI#n. The UL transmission processing unitis configured to transmit the uplink information at each of TTIs using only one CC, and when a plurality of CCs is allocated at TTI#n, the UL transmission processing unitis configured to select uplink information to be transmitted at TTI#n+4, based on a priority corresponding to the uplink information to be transmitted using each of the plurality of CCs allocated.

Mobile station for uplink carrier aggregation using component carriers

A mobile station UE notifies a radio base station of a total amount of data accumulated in a buffer with granularity finer than an LCG. A mobile station UE according to the present invention includes: a management unitconfigured to manage LCGs and manage DFGs each of which is a group of one or more priorities assigned to one or more data flows; and a transmission unitconfigured to notify a radio base station eNB of a total amount of data remaining in a buffer for each of combinations of the LCGs and DFGs.

Mobile station and radio base station

In order to control feedback control information in uplink transmission appropriately even when using carrier aggregation in HetNet, the present invention provides a user terminal that is able to communicate with a plurality of radio base stations having overlapping coverage areas by using carrier aggregation, the user terminal comprising: a reception section that receives downlink shared channel signals using component carriers of a primary cell and a secondary cell; a generating section that generates transmission acknowledgement signals in response to the downlink shared channel signals; and an allocating section that allocates the transmission acknowledgement signals to predetermined uplink control channel resources, wherein the allocating section allocates the transmission acknowledgement signals to either or both of uplink control channel resources of the primary cell and uplink control channel resources of the secondary cell in accordance with contents of the transmission acknowledgement signals and/or an uplink control channel format.

Growing community of inventors

Tokyo, Japan

Kohei Kiyoshima