Abstract: A roadside apparatus according to the first aspect includes: a housing including an antenna mounting surface; an antenna connection terminal being provided on the antenna mounting surface, and supporting both a rod antenna and a planar antenna; and a circuit being housed in the housing, and being configured to perform road-to-vehicle communication via a connection antenna connected to the antenna connection terminal. An area of the antenna mounting surface is equal to or larger than an area of the planar antenna. An antenna selected out of the planar antenna and the rod antenna is connected as the connection antenna to the antenna connection terminal.

Abstract: A base station 200 provided around a road including: a receiver 213 configured to receive a first communication signal broadcasted from a mobile station installed on a vehicle, a controller 230 configured to calculate antenna weight forming a beam to the mobile station based on the received first communication signal, and a transmitter 214 configured to transmit a second communication signal to the mobile station by a transmission beamforming, by using the calculated antenna weight.

Abstract: A roadside apparatus according to the first aspect includes: a housing including an antenna mounting surface; an antenna connection terminal being provided on the antenna mounting surface, and supporting both a rod antenna and a planar antenna; and a circuit being housed in the housing, and being configured to perform road-to-vehicle communication via a connection antenna connected to the antenna connection terminal. An area of the antenna mounting surface is equal to or larger than an area of the planar antenna. An antenna selected out of the planar antenna and the rod antenna is connected as the connection antenna to the antenna connection terminal.

Abstract: A base station used in a traffic communication system includes a communicator configured to receive, via wireless communication, information transmitted from a vehicle traveling on a road, and a controller configured to identify, based on the information received by the communicator, a traveling behavior including a travel route of the vehicle on the road. The controller is configured to execute first processing for performing statistical learning or machine learning on a plurality of the traveling behaviors respectively identified for a plurality of the vehicles traveling on the road, and second processing for determining, based on a result of the first processing, whether a traffic obstacle is present on the road and a position of the traffic obstacle on the road.

Abstract: A vehicle that performs communication with a roadside apparatus installed in a roadside of a road at least, the vehicle includes a communicator configured to transmit a message including an information element indicating whether or not one or more towed vehicles are towed by a towing vehicle.

Abstract: A base station 200 provided around a road including: a receiver 213 configured to receive a first communication signal broadcasted from a mobile station installed on a vehicle, a controller 230 configured to calculate antenna weight forming a beam to the mobile station based on the received first communication signal, and a transmitter 214 configured to transmit a second communication signal to the mobile station by a transmission beamforming, by using the calculated antenna weight.

Abstract: A vehicle that performs communication with a roadside apparatus installed in a roadside of a road at least, the vehicle includes a communicator configured to transmit a message including an information element indicating whether or not one or more towed vehicles are towed by a towing vehicle.

Abstract: In the presence of an assignment of the downlink resource block to the UE2-1, the eNB1-1 requests the UE2-1 to transmit SRS in the frequency band corresponding to the comb 0, and in the absence of the assignment of the downlink resource block to the UE2-1, the eNB1-1 requests the UE2-1 to transmit SRS in the frequency band corresponding to the comb 1. The UE2-1 transmits the SRS of the frequency band corresponding to the request.

Abstract: An eNB1-1 employs frequency hopping that assigns a radio resource to a UE2-1 in response to switching of a frequency of an SRS from the UE2-1, and determines an MCS in a first radio resource block when a first downlink radio resource block is assigned to the UE2-1, on the basis of SINR acquired for a second downlink radio resource block having a frequency bandwidth equal to a frequency bandwidth of the first downlink radio resource and being assigned to the UE2-1 in the past.

Abstract: A mobile station transmits an appropriate reference signal to substantialize appropriate AAS control. A mobile station 100 according to the present invention includes a transmission and reception unit 110 configured to perform a radio communication with a base station 1 and a control unit 130 configured to, by using a reference signal region of an uplink communication channel in the same frequency band as a downlink communication channel assigned to the mobile station itself in assignment information of a communication channel from the base station 1 received by the transmission and reception unit 110, transmit a reference signal from the transmission and reception unit to the base station.

Abstract: In the presence of an assignment of the downlink resource block to the UE2-1, the eNB1-1 requests the UE2-1 to transmit SRS in the frequency band corresponding to the comb 0, and in the absence of the assignment of the downlink resource block to the UE2-1, the eNB1-1 requests the UE2-1 to transmit SRS in the frequency band corresponding to the comb 1. The UE2-1 transmits the SRS of the frequency band corresponding to the request.

Abstract: An eNB1-1 employs frequency hopping that assigns a radio resource to a UE2-1 in response to switching of a frequency of an SRS from the UE2-1, and determines an MCS in a first radio resource block when a first downlink radio resource block is assigned to the UE2-1, on the basis of SINR acquired for a second downlink radio resource block having a frequency bandwidth equal to a frequency bandwidth of the first downlink radio resource and being assigned to the UE2-1 in the past.

Abstract: A communication system includes: an RF/IF/BB unit (21) for receiving, in a mobile station device (20), a transmission signal from a base station device; a received power calculation unit (221) for obtaining received power thereof; a communication rate modification unit (23) for changing a communication rate by changing a modulation scheme used by the base station device to modulate the transmission signal in a predetermined case; and a communication rate increase limit unit (27) for limiting the communication rate to be increased by the communication rate modification unit (23), according to received power required for the mobile station device (20) to demodulate the transmission signal and according to the received power obtained when receiving the transmission signal after the communication rate is changed by the communication rate modification unit (23) and predicted based on the received power obtained by the received power calculation unit (221) and based on a decrease amount of a transmission power of a

Abstract: A mobile station transmits an appropriate reference signal to substantialize appropriate AAS control. A mobile station 100 according to the present invention includes a transmission and reception unit 110 configured to perform a radio communication with a base station 1 and a control unit 130 configured to, by using a reference signal region of an uplink communication channel in the same frequency band as a downlink communication channel assigned to the mobile station itself in assignment information of a communication channel from the base station 1 received by the transmission and reception unit 110, transmit a reference signal from the transmission and reception unit to the base station.

Abstract: A wireless communication system includes a plurality of base stations and a management server. Each base station includes: a carrier sensing unit which performs carrier sensing for other base stations; a list generating unit which generates a monitor list including a difference in frame timing between the base station and each other base station; and a base station transmitter which transmits the monitor list. The management server includes: a management receiver which receives the monitor lists; a calculation unit which calculates a shift amount by which the frame timing of a target base station is to be shifted, based on the monitor lists; and a shift instructing unit which instructs to shift the frame timing of the target base station by the shift amount if the differences in frame timing among the base stations when reflecting the shift amount is improved from those before reflecting the shift amount.

Abstract: A communication system includes: an RF/IF/BB unit (21) for receiving, in a mobile station device (20), a transmission signal from a base station device; a received power calculation unit (221) for obtaining received power thereof; a communication rate modification unit (23) for changing a communication rate by changing a modulation scheme used by the base station device to modulate the transmission signal in a predetermined case; and a communication rate increase limit unit (27) for limiting the communication rate to be increased by the communication rate modification unit (23), according to received power required for the mobile station device (20) to demodulate the transmission signal and according to the received power obtained when receiving the transmission signal after the communication rate is changed by the communication rate modification unit (23) and predicted based on the received power obtained by the received power calculation unit (221) and based on a decrease amount of a transmission power of a

Abstract: A communication system includes: an RF/IF/BB unit (21) for receiving, in a mobile station device (20), a transmission signal from a base station device; a received power calculation unit (221) for obtaining received power thereof; a communication rate modification unit (23) for changing a communication rate by changing a modulation scheme used by the base station device to modulate the transmission signal in a predetermined case; and a communication rate increase limit unit (27) for limiting the communication rate to be increased by the communication rate modification unit (23), according to received power required for the mobile station device (20) to demodulate the transmission signal and according to the received power obtained when receiving the transmission signal after the communication rate is changed by the communication rate modification unit (23) and predicted based on the received power obtained by the received power calculation unit (221) and based on a decrease amount of a transmission power of a

Abstract: A communication system includes: an RE/IF/BB unit (21) for receiving, in a mobile station device (20), a transmission signal from a base station device; a received power calculation unit (221) for obtaining received power thereof; a communication rate modification unit (23) for changing a communication rate by changing a modulation scheme used by the base station device to modulate the transmission signal in a predetermined case; and a communication rate increase limit unit (27) for limiting the communication rate to be increased by the communication rate modification unit (23), according to received power required for the mobile station device (20) to demodulate the transmission signal and according to the received power obtained when receiving the transmission signal after the communication rate is changed by the communication rate modification unit (23) and predicted based on the received power obtained by the received power calculation unit (221) and based on a decrease amount of a transmission power of a

Abstract: A wireless communication system includes a plurality of base stations and a management server. Each base station includes: a carrier sensing unit which performs carrier sensing for other base stations; a list generating unit which generates a monitor list including a difference in frame timing between the base station and each other base station; and a base station transmitter which transmits the monitor list. The management server includes: a management receiver which receives the monitor lists; a calculation unit which calculates a shift amount by which the frame timing of a target base station is to be shifted, based on the monitor lists; and a shift instructing unit which instructs to shift the frame timing of the target base station by the shift amount if the differences in frame timing among the base stations when reflecting the shift amount is improved from those before reflecting the shift amount.