Sharp Kabushiki Kaisha Corporation

Huawei Technologies Co., Limited

Yuhsuke Takagi

Katsutoshi Ishikura

Shigeto Suzuki

Tadashi Shimonabe

Mitsuru Sakamoto

Akira Ohshima

Shinichi Sawada

Shumpei Fuse

Atsushi Yamazaki

Hideyuki Nakanishi

Hirokazu Kobayashi

Akio Yoshihara

Shuichi Takehana

Keiji Hikoso

Hiroyuki Saga

Takashi Naito

Fumiyo Satoh

Kouki Suzuki

Ryoki Hinata

Sawada Shinichi

A communication system is for improving utilization efficiency of radio resources. The communication system includes a base station device and a plurality of terminal devices that communicate with the base station device. The base station device includes a first control unit that assigns radio resources including at least one or more resource blocks to at least one of the plurality of terminal devices. The at least one of the plurality of terminal devices comprises a second control unit that transmits transmission data by using at least some of the radio resources assigned to the at least one of the plurality of terminal devices.

Communication system, base station device, terminal device, communication method, and program

A base-station apparatus includes: a communicator that performs wireless communication; and a controller. During communication with at least a first terminal apparatus, when a communication volume used for communication that is newly stated with a second terminal apparatus becomes smaller than or equal to an un-used communication volume, the controller transmits, to a target terminal apparatus that is one of the first and second terminal apparatuses, a communication instruction for communication with a second base-station apparatus having a coverage range in which the target terminal apparatus is located, and when a communication volume used for communication with the target terminal apparatus exceeds the un-used communication volume, the controller transmits a callback instruction for callback from the second base-station apparatus to the base-station apparatus to the target terminal apparatus or the second base-station apparatus.

Base-station apparatus, communication system, and communication method

A base station device includes: a communication unit configured to wirelessly communicate with a terminal device; a storage unit; and a control unit. The control unit is configured to refer to discontinuous reception information, stored in the storage unit, which indicates a plurality of discontinuous reception settings, transmit transmission data to the terminal device in at least a portion of a first reception period of time corresponding to at least one of the discontinuous reception settings, and transmit the transmission data to the terminal device in at least a portion of a second reception period of time corresponding to at least another one of the discontinuous reception settings in a case that it is determined that response information with respect to the transmitted transmission data is not received.

Base station device, communication system, terminal device, communication method, and program

A wireless communication system includes a first base station device, a second base station device, a mobile station device configured to communicate with the first base station device using a first component carrier and to communicate with the second base station device using a second component carrier. The first base station device includes a disconnection preparation requesting unit configured to transmit to the second base station device, a disconnection preparation request that requests the second base station device to prepare to disconnect the second component carrier.

Wireless communication system, wireless communication method, mobile station device, base station device, program, and recording medium

A mobile station device is provided with a communication unit for simultaneously executing a first communication with a first base station device executed over a first frequency band, and a second communication with a second base station that differs from the first base station apparatus over a second frequency band that differs from the first frequency band, and a control unit for adjusting individual ones of a first transmission power and second transmission power on the basis of both the first transmission power, which is used for the first communication, and the second transmission power, which is used for the second communication.

Communication system, mobile station apparatus, and communication method

A wireless communication system allows a handover operation to a base station communicating through a plurality of frequency bands. The mobile terminal includes a communication unit adapted to perform communication with any of the base stations through a plurality of frequency bands. The communication unit of the base station notifies, when communication through a plurality of frequency bands is possible, a mobile terminal about information directed to identifying a main frequency band from relevant frequency bands in a manner allowing discrimination from one or more frequency bands other than the main frequency band. The communication unit of the mobile terminal determines that, upon receiving information directed to identifying a main frequency band from the second base station during having communication connection with the first base station, that the frequency band identified by the relevant information is a subject of handover towards the second base station.

Wireless communication system, communication method, base station, and mobile terminal

A wireless communication system includes a plurality of base station devices, and a mobile station device configured to communicate with the plurality of base station devices. The mobile station device includes: a necessity determining unit configured to refer to a communication state of a first base station device that is a base station device in communication with the mobile station device, and determine necessity of carrier aggregation; a cell search unit configured to, in a case that the necessity determining unit determines that carrier aggregation is necessary, search a communication available base station device from the plurality of base station devices; and a carrier aggregation requesting unit configured to, in a case that at least one communication available base station device is detected by the search, transmit a request for carrier aggregation to the first base station device, thus providing a wireless communication system that can obtain an excellent speed.

Wireless communication system, wireless communication method, mobile station device, and base station device

A wireless communication system includes a first base station device, a second base station device, and a mobile station device configured to communicate with the first and second base station devices. The first base station device includes a request notifying unit configured to notify the mobile station device of a request for carrier aggregation. The mobile station device includes: a cell search unit configured to, upon receiving the request, perform cell search and thereby search the second base station device available for carrier aggregation; and a base station notifying unit configured to notify the first base station device of information indicating the second base station device detected by the cell search unit performing the cell search.

During a period of parallel-like radio communication with two or more first base stations, the first base station designates a second base station correlated with one of the two or more first base stations, and temporarily suspends the radio communication in accordance with a first communications standard to issue, to a mobile station, a request of measurement for the designated second base station. The first base station receives a result of the measurement for the designated second base station. The first base station notifies the mobile station of a handover from the first communications standard to a second communications standard, and also notifies the mobile station of a request for starting a coordination mode in which the two or more second base stations including the designated second base station establish communication with the mobile station in coordination with each other.

Communication system and communication method

A radio communication system includes transmission/reception devices which perform communication by dynamically switching a first transmission mode and a second transmission mode having a lower quality than the first transmission mode, wherein the transmission/reception devices have a transmission mode decision means which fixes a transmission mode upon communication to the first transmission mode for a given period of time.

Radio communication system and method using spatial diversity and spatial multiplexing modes

A communication system includes: a determination unit, provided in any one of a first base station, a second base station, and a mobile station, which determines a transmission timing change amount on the basis of reception timing of a signal transmitted between the first or second base station and the mobile station. The mobile station includes a handover execution unit which performs a handover from the first base station to the second base station on the basis of the transmission timing change amount calculated by the determination unit.

Communication system, mobile station, base station, and communication method

It is possible to complete a re-connection in a short time and prevent instantaneous interruption of communication by including a plurality of base station apparatuses and a mobile station apparatus; the mobile station apparatus includes: a delay difference detecting unit that detects a difference in reception timing between a signal from the base station apparatus with which the mobile station apparatus currently communicates and a signal from the base station apparatus that is a re-connection destination candidate; a transmission timing calculating unit that calculates, based on the difference in reception timing, a transmission timing to the base station apparatus that is the re-connection destination candidate; and a re-connection processing unit that, having detected a disconnection of the communication with the base station apparatus with which the mobile station apparatus currently communicates, uses the transmission timing to start a communication with the base station apparatus that is the re-connection destination candidate.

Mobile communication system, mobile station apparatus and re-connection method

A mobile communication device includes antennas, transmitting units, and receiving units. A baseband processing unit of the mobile communication device transmits data signals to a base station device through a receiving unit and an antenna that are selected based on an instruction received from the base station device. The baseband processing unit transmits reference signals to the base station device through the transmitting units and the antennas while preventing transmission frequencies of the reference signals from overlapping one another. A baseband processing unit of the base station device transmits, to the mobile communication device based on qualities of the received reference signals, a signal indicating information concerning which of the antennas and the transmitting units of the mobile communication device are used for transmitting the data signals, the signal also indicating information concerning whether or not to make the transmitting units and the antennas share transmission of the reference signals. Thus, interferences due to degradation of communication quality and to an increase in the number of reference signals can be prevented.

Mobile communication system, mobile communication device, and method for employing antenna and transmitting unit selection for transmission of reference and data signals

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Osaka, Japan

Yuhsuke Takagi