Mitsubishi Electric Corporation

Nec Corporation

Tetsuya Aoyama

Seiya Nagashima

Yuji Miyake

Masaaki Kusano

Keijiro Take

Yusuke Kinoshita

Yuya Takatsuka

Keiko Sameshima

The wireless relay device according to the present disclosure includes: a reception unit to receive train control information; an information classification unit to classify the train control information into first control information requiring immediacy and second control information not requiring immediacy; a message generation unit to generate one message from the first control information contained in a piece of the train control information and to generate one message from a plurality of pieces of the second control information contained in a plurality of pieces of the train control information; and a transmission unit to transmit the messages generated by the message generation unit. With this configuration, it is possible to reduce the number of the data transfer messages which does not require immediacy while the instantaneous communication for the control information which requires immediacy is maintained.

Wireless relay device, and memory to store program for controlling wireless relay device

Provided are: a sending/receiving unit to receive data frames sent from another wireless station and receivable, the receivable data frames including a first data frame that is a relay target; an interference time storage unit to store an interference time that is a time from when the sending/receiving unit starts receiving each of the data frames to when the sending/receiving unit terminates receiving the data frame; a waiting time determination unit to determine a waiting time on a basis of the interference time; a frame generation unit to generate a second data frame by changing a destination of the first data frame to a data aggregation station that aggregates the data frames or to a wireless station that serves as a relay destination; and a transmission control unit to wait for the waiting time and cause the sending/receiving unit to send the second data frame.

Wireless station, data aggregation station, wireless system, transmission control method for wireless station, transmission control method for data aggregation, control circuit, and non-transitory storage medium

In a wireless communication system including a plurality of wireless base stations, the wireless base stations other than the uppermost wireless base station among the plurality of wireless base stations each determine a frame timing on the basis of synchronization timing information received from the upper wireless base station, and the wireless base stations other than the lowermost wireless base station among the plurality of wireless base stations each notify the lower wireless base station of the synchronization timing information. A communication path from the uppermost wireless base station to the lowermost wireless base station includes a branch point and a merge point, and a junction base station that is the wireless base station installed at the merge point measures a synchronization error between a priority synchronization path and a non-priority synchronization path different from the priority synchronization path, the priority synchronization path being one of a plurality of the communication paths from the branch point to the merge point. Each of the plurality of wireless base stations installed on the non-priority synchronization path adjusts the frame timing on the basis of the synchronization error.

Wireless communication system, wireless communication method, and storage medium of the system

A wireless communication unit transmits and receives signals to and from a base station and measures the received quality of downlink signals. A position information acquisition unit acquires position information on a mobile station. A measurement information management unit acquires the position information, received quality information, and received quality information that is measurement result of received quality of uplink signals from the mobile station, and stores measurement information which is received quality information on signals transmitted and received between the mobile station and the base station. A communication connection control unit acquires the position information from the position information acquisition unit, and performs a handover when a position of the mobile station is a handover position so as to switch base stations to be connected.

Mobile station, base station, maintenance device, mobile communication system and handover position determination method

A train control system controls an operation of a train by transmitting and receiving, between an on-vehicle wireless station mounted on the train and a ground wireless base station, information that includes train control information by wireless communication. General transmission information, which is information included in the information that includes the train control information and is transmitted only once from the ground wireless base station to the on-vehicle wireless station. The train control information is transmitted repeatedly a plurality of times from the ground wireless base station to the on-vehicle wireless station. Among the repeatedly transmitted train control information, the on-vehicle wireless station uses, for an operation of the train, a piece of train control information, which the on-vehicle wireless station receives without lack of data lack for a first time.

Train control system, base-station control device, ground wireless base station, and on-vehicle wireless station

A train control system enabling a train to smoothly travel while performing handover. The system includes an on-vehicle wireless station mounted on a train following a preceding train and connected to an on-vehicle control device of the train, ground wireless base stations capable of wirelessly communicating with the on-vehicle wireless station, and a base station control device to control the base stations. The ground wireless base station is located between the ground wireless base station with which the on-vehicle wireless station is communicating and the ground wireless base station forming a communication area including a travelling permission point determined by a position of the train. The base station control device reserves radio resources of the ground wireless base stations while communicating with the ground wireless base station.

Train control system, base station control device, and ground wireless base station system

A communication control method executed in a multi-hop cellular network including at least one gateway and a plurality of radio base stations includes: a first radio base station performing radio resource management and movement management concerning a radio mobile station requesting, when the first radio base station determines it is necessary to switch a connection destination of the radio mobile station, a second radio base station at a handover destination to perform handover processing and instructing the radio mobile station (a handover execution mobile station) to perform handover to the second radio base station; and the second radio base station determining, based on the number of times of transfer until a signal transmitted from the first radio base station reaches the own station, whether to change the radio base station that performs the radio resource management and the movement management concerning the handover execution mobile station.

Communication control method and radio base station

A synthesis constraint creating unit has a process emergence number acquiring unit that acquires, for each process attribute, the emergence number of the process belonging to each process attribute, the process being in the behavior level description, a circuit structure component specifying unit that specifies a kind of a circuit structural component which can embody the process belonging to each process attribute and which can be described in a register transfer level description, for each process attribute, and a synthesis constraint creating unit that creates synthesis constraint information indicating the kind and number of circuit structural component necessary for expressing the process described in the behavior level description by the register transfer level description based on the emergence number of the process acquired for each process attribute and the kind of the circuit structural component specified for each process attribute.

Synthesis constraint creating device, behavioral synthesis device, synthesis constraint creating method and recording medium

A behavioral synthesis unit generates an intermediate level description that describes a plurality of processes indicated by a behavioral level description and data passed over during the plurality of processes based oil a behavioral level description describing the behavior of an electronic circuit and synthesis constraint information constituting constraints to be satisfied while generating a register transfer level description based on the behavioral level description and the number and type of circuit configuration elements that can be described in the register transfer level description. The data flow path information analyzing unit acquires path information indicating a data path and at least one process executed on the path based on the intermediate level description. A synthesis constraint generating unit then generates new synthesis constraint information that improves prescribed circuit performance of the electronic circuit based on library information and path information.

Data processing device, behavioral synthesis device, data processing method, and recording medium

An aspect of the invention provides a circuit generation system that can automatically generate a power control circuit. In the circuit generation system according to the aspect of the invention includes a behavioral synthesis unit that generates synthesis-attached information and RT-level circuit information based on behavioral-level description information in which information on a circuit is described by a program language; and a power control circuit generation unit that generates a power control circuit based on the synthesis-attached information, and connects the generated power control circuit to an RT-level circuit of the RT-level circuit information.

Growing community of inventors

Tokyo, Japan

Tetsuya Aoyama