Abstract: The invention provides a system and method of identifying when a message is received at a control station from at least one device in a network having a plurality of devices, said method comprising the steps of receiving at the control station a low bandwidth signal from at least one device; obtaining a coarse timestamp estimate of when said low bandwidth signal is received by correlating with a pre-programmed signal template; generating a higher resolution correlation estimate by phase shifting the pre-programmed signal template and repeating the correlation; and detecting where the correlation is above a preselected value; and applying a curve fitting function about the higher resolution correlation estimate to obtain an accurate timestamp when the message was received.

Abstract: The invention provides a system and method of identifying when a message is received at a control station from at least one device in a network having a plurality of devices, said method comprising the steps of receiving at the control station a low bandwidth signal from at least one device; obtaining a coarse timestamp estimate of when said low bandwidth signal is received by correlating with a pre-programmed signal template; generating a higher resolution correlation estimate by phase shifting the pre-programmed signal template and repeating the correlation; and detecting where the correlation is above a preselected value; and applying a curve fitting function about the higher resolution correlation estimate to obtain an accurate timestamp when the message was received.

Abstract: Provided is an RF resource allocation device that distributes to a mobile terminal a communication setting notification including a communication setting to be used in a radio communication. The device includes an acquisition unit configured to acquire a measurement result or an estimation result of communication conditions at a plurality of positions; a generation unit configured to determine for each region the communication setting to be used by the mobile terminal in the radio communication based on the communication conditions, and to generate the communication setting notification including the communication setting for each region; and a transmission unit configured to transmit the communication setting notification to the mobile terminal The acquisition of the communication conditions by the acquisition unit and the generation of the communication setting notification by the generation unit are executed repeatedly at predetermined time intervals.

Abstract: A wireless communication apparatus includes a radar device; a communication device configured to communicate using at least a part of a frequency band that is used by the radar device; an acquirer configured to acquire a position of a target object using the radar device; a predictor configured to predict a trajectory of the target object from history of positions of the target object; and a controller configured to determine a communication start time with the target object based on a communication range of the communication device and the trajectory of the target object, and control the communication device so that data is transmitted to the target object at the determined communication start time using the communication device.

Abstract: Provided is an RF resource allocation device that distributes to a mobile terminal a communication setting notification including a communication setting to be used in a radio communication. The device includes an acquisition unit configured to acquire a measurement result or an estimation result of communication conditions at a plurality of positions; a generation unit configured to determine for each region the communication setting to be used by the mobile terminal in the radio communication based on the communication conditions, and to generate the communication setting notification including the communication setting for each region; and a transmission unit configured to transmit the communication setting notification to the mobile terminal The acquisition of the communication conditions by the acquisition unit and the generation of the communication setting notification by the generation unit are executed repeatedly at predetermined time intervals.

Abstract: A wireless communication apparatus includes a radar device; a communication device configured to communicate using at least a part of a frequency band that is used by the radar device; an acquirer configured to acquire a position of a target object using the radar device; a predictor configured to predict a trajectory of the target object from history of positions of the target object; and a controller configured to determine a communication start time with the target object based on a communication range of the communication device and the trajectory of the target object, and control the communication device so that data is transmitted to the target object at the determined communication start time using the communication device.

Abstract: Provided is an RF resource allocation device that distributes to a mobile terminal a communication setting notification including a communication setting to be used in a radio communication. The device includes an acquisition unit configured to acquire a measurement result or an estimation result of communication conditions at a plurality of positions; a generation unit configured to determine for each region the communication setting to be used by the mobile terminal in the radio communication based on the communication conditions, and to generate the communication setting notification including the communication setting for each region; and a transmission unit configured to transmit the communication setting notification to the mobile terminal The acquisition of the communication conditions by the acquisition unit and the generation of the communication setting notification by the generation unit are executed repeatedly at predetermined time intervals.

Abstract: Provided is an RF resource allocation device that distributes to a mobile terminal a communication setting notification including a communication setting to be used in a radio communication. The device includes an acquisition unit configured to acquire a measurement result or an estimation result of communication conditions at a plurality of positions; a generation unit configured to determine for each region the communication setting to be used by the mobile terminal in the radio communication based on the communication conditions, and to generate the communication setting notification including the communication setting for each region; and a transmission unit configured to transmit the communication setting notification to the mobile terminal The acquisition of the communication conditions by the acquisition unit and the generation of the communication setting notification by the generation unit are executed repeatedly at predetermined time intervals.

Abstract: A safety information transmission method includes a step wherein a first portable terminal transmits the safety information to the vehicle-mounted terminal, a step wherein the vehicle-mounted terminal stores the safety information received from the first portable terminal, a step wherein the vehicle-mounted terminal transmits the safety information to another vehicle-mounted terminal by a vehicle-to-vehicle communication, a step wherein the vehicle-mounted terminal stores the safety information received from the other vehicle-mounted terminal by the vehicle-to-vehicle communication, and a step wherein any of the vehicle-mounted terminals transmits the safety information stored in the vehicle-mounted terminal to an information server via an access point when the vehicle-mounted terminals has reached a communication possible area of the access point, or transmits the safety information stored in the vehicle-mounted terminal to a second portable terminal when the vehicle-mounted terminal has become capable of co

Abstract: Efficient spectrum sensing is implemented taking into account the fading caused by multipath fading and shadow fading in a mobile environment.

Abstract: A safety information transmission method includes a step wherein a first portable terminal transmits the safety information to the vehicle-mounted terminal, a step wherein the vehicle-mounted terminal stores the safety information received from the first portable terminal, a step wherein the vehicle-mounted terminal transmits the safety information to another vehicle-mounted terminal by a vehicle-to-vehicle communication, a step wherein the vehicle-mounted terminal stores the safety information received from the other vehicle-mounted terminal by the vehicle-to-vehicle communication, and a step wherein any of the vehicle-mounted terminals transmits the safety information stored in the vehicle-mounted terminal to an information server via an access point when the vehicle-mounted terminals has reached a communication possible area of the access point, or transmits the safety information stored in the vehicle-mounted terminal to a second portable terminal when the vehicle-mounted terminal has become capable of co

Abstract: Efficient spectrum sensing is implemented taking into account the fading caused by multipath fading and shadow fading in a mobile environment.

Abstract: A wireless communication device which includes: a sensing antenna for sensing communication by a primary user; a first transmission antenna; a second transmission antenna; first transmitting unit that generates a transmission signal to be transmitted from the first transmission antenna; second transmitting unit that generates a transmission signal to be transmitted from the second transmission antenna and that cancels, in the sensing antenna, a transmission signal from the first transmission antenna; digital signal processing unit that suppresses the transmission signal from the first transmission antenna, from a received signal of the sensing antenna; and sensing unit that detects communication by a primary user on the basis of the received signal of the sensing antenna that has been processed by the digital signal processing unit. While performing communication as a secondary user, the device detects communication by a primary user.

Abstract: A wireless communication device which includes: a sensing antenna for sensing communication by a primary user; a first transmission antenna; a second transmission antenna; first transmitting unit that generates a transmission signal to be transmitted from the first transmission antenna; second transmitting unit that generates a transmission signal to be transmitted from the second transmission antenna and that cancels, in the sensing antenna, a transmission signal from the first transmission antenna; digital signal processing unit that suppresses the transmission signal from the first transmission antenna, from a received signal of the sensing antenna; and sensing unit that detects communication by a primary user on the basis of the received signal of the sensing antenna that has been processed by the digital signal processing unit. While performing communication as a secondary user, the device detects communication by a primary user.