Fujitsu Corporation

Ntt Docomo, Inc.

Masatsugu Shimizu

Yoshihiro Kawasaki

Yoshiaki Ohta

Yoshiharu Tajima

Katsumasa Sugiyama

Kazuhisa Obuchi

Takayoshi Ode

Yoshinori Tanaka

Shyuichi Murata

A radio communication method includes: by a radio terminal device, generating position indicating signals that are different between blocks of radio resources each of which is an allocation unit of data; mapping the position indicating signals generated and transmission data to the blocks; and transmitting a signal including the blocks; by a base station device, receiving the signal including the blocks of the radio resources; evaluating continuity of the blocks, based on the position indicating signals mapped to the blocks; and demodulating data mapped to the blocks for each radio terminal device, based on an evaluation result.

Device, system, and method for efficiently determining delimiting position

A base station that can transmit a synchronization signal at a predetermined transmission interval in a plurality of cycles includes a processor configured to continuously transmit the synchronization signal in a plurality of radio signals; and control radio measurement of a mobile station connected to the base station such that the mobile station detects the synchronization signal under a condition in accordance with second information that has been scaled by using first information.

Base station, mobile station, communication system, and communication method

Base station, mobile station, communication system, and communication method for performing cell selection/reselection appropriately

A wireless terminal of a wireless communication system, the wireless communication system including a wireless base station and one or more wireless terminals, the wireless terminal includes: a radio communication circuit configured to perform wireless communication with the wireless base station; and a controller configured to allocate a part of an allocation amount of a wireless resource indicated in uplink grant to transmission of a status report of a transmission buffer when the uplink grant is received from the wireless base station, and uplink data stored in the transmission buffer is transmitted by using the radio communication circuit.

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

Radio communication method, radio terminal device, and base station device

A wireless communication apparatus including: at least one antenna configured to transmit a transmission signal including radio signals in parallel, each radio signal having each frequency band, the radio signals including physical channels, each radio signal including at least one of the physical channels, a memory configured to store coefficient values, each coefficient value being associated with each first factor and each second factor, each first factor being each identity among each set of scrambling codes used in each set of specific physical channels among the physical channels, each second factor being each set of transmission formats used in each set of specific physical channels among the physical channels, and a processor configured to: obtain, for each repeated combination taken from the physical channels, each of coefficient values from the stored coefficient values, and estimate an exponential of amplitude of the transmission signal based on the obtained coefficient values.

Wireless communication device and controlled method to transmit a plurality of signals in parallel

An equalization processing apparatus includes a correlation matrix generating unit. The correlation matrix generating unit calculates a correlation value between a plurality of paths of a received signal coming from the paths based on a correlation pattern selected from a plurality of correlation patterns indicating combinations of the numbers of correlation chips as arbitrary chips to be used for calculation of the correlation value among all the chips of the received signal and identification numbers of the correlation chips so as to generate a correlation matrix that is applied to equalization processing on the received signal.

Equalization processing apparatus, wireless communication terminal, and equalization processing method

When transmitting data from a data relay apparatus to a mobile station through a plurality of base stations, the plurality of base stations add sequence numbers to the data and transmits the data with the sequence number. The data relay apparatus transfers a first data and second data to the mobile station through different base stations among the plurality of base stations, in which the data relay apparatus transfers the first data received before the second data to one base station and transfers the second data while adding thereto information indicating the reception order of the first and second data. Each of the plurality of base stations, when the data transferred from the data relay apparatus contains the information added thereto, adds the sequence number to the data based on the information and transmits the data with the sequence numbers to the mobile station.

Data relay apparatus for transferring data to a mobile terminal via a plurality of base stations

A mobile communication system comprises a base station and a relay station to relay data transmitted/received between the base station and a mobile station. The base station includes a first scheduler to perform scheduling of initial transmission of the data transmitted/received between the base station and the mobile station via the relay station, and a first manager to manage predetermined wireless resources which are periodically used, as wireless resources used for the initial transmission of the data. The relay station includes a second scheduler configured to perform scheduling of transmission of a message for confirming necessity of retransmission of the data and retransmission of the data and a second manager configured to manage wireless resources used for the transmission of the message and the retransmission of the data.

Mobile communication system

A wireless communication network system includes: a mobile terminal that transmits a switching request for requesting to switch a connection target from a currently connected first wireless communication apparatus to a second wireless communication apparatus mounted on a mobile body; and a wireless communication apparatus that determines permission or prohibition that the mobile terminal switches the connection target from its own apparatus to the second wireless communication apparatus, based on permission/prohibition setting of the connection target switching from the first wireless communication apparatus to the second wireless communication apparatus in accordance with a type of the first wireless communication apparatus.

Wireless communication network system, wireless communication apparatus, mobile terminal, connection-target switch determining method, and connection-target change determining method

A wireless communication system includes a base station, a user equipment, and a relay station that relays a wireless signal sent and received between the base station and the user equipment. The relay station includes a first processor that executes reconnection processing with the base station, every time a plurality of time durations with respect to certain timing elapse, for a call corresponding to each time duration, and a transmitter that, if a reconnection with the base station is not made until a predetermined time elapses after a start of the reconnection processing for the call corresponding to the each time duration, sends a message for notifying a call disconnection of the corresponding call in response to the lapse of the predetermined time. The user equipment includes a receiver, and a second processor that executes call disconnection processing on the corresponding call in response to the message being received.

Wireless communication system, relay station, user equipment, and wireless communication method

A radio communication system includes a relay station, a first radio base station, second radio base stations, and a mobile station. The relay station is connected by radio to the first radio base station and communicates with the second radio base stations via the first radio base station. When the relay station communicates with the second radio base stations, the relay station requests the first radio base station to communicate with the second radio base stations for the relay station. The requested first radio base station communicates with the second radio base stations for the relay station and transmits a communication result to the relay station.

Radio communication system

A method used in a radio communication system including a first radio base station, a second radio base station that communicates with the first radio base station, a relay station which communicates with the second radio base station via the first radio base station, and a mobile station, the method transmits a request, by the second radio base station, for requesting the first radio base station to communicate with the relay station for the second radio base station and communicating, by the requested first radio base station, with the relay station for the second radio base station and transmits a communication result to the second radio base station.

Systems and methods for enhancing base station performance through the use of a relay station

An MBMS-GW delivers multicast data from a contents management server respectively to base stations, partitions and codes the multicast data into a plurality of pieces of multiple description code data, and delivers the plurality of pieces of MD-code data respectively to the base stations. Each of the base stations arbitrarily sets a plurality of transmission carrier frequencies for respectively transmitting the plurality of pieces of MD code data, and concurrently transmits the plurality of pieces of MD code data delivered from the MBMS-GW by respectively using the plurality of transmission carrier frequencies set by the transmission frequency setting unit. An LTE terminal or an LTE-A terminal receives, from a corresponding base station, any one or more of the plurality of pieces of MD code data transmitted by using the plurality of transmission carrier frequencies, and decodes and reproduces the multicast data from the received MD-code data.

Multicast data communication method and communication system

A wireless communication system includes a relay station, first and second wireless base stations, a gateway device, and a mobile station. The gateway device is connected to the first and second wireless base stations by a cable. The first and second wireless base stations are interconnected by a cable. The relay station is connected wirelessly to the first wireless base station to perform relayed communication via the first wireless base station. When the mobile station at a lower level than the relay station executes handover to the second wireless base station, the first wireless base station switches a data transfer route by redirecting data which is not yet completely transmitted to the mobile station, to be forwarded to the second wireless base station.

Growing community of inventors

Yokohama, Japan

Masatsugu Shimizu