Abstract: A driving assistance device according to the present disclosure is capable of being mounted on a vehicle. The vehicle includes: a vehicle body; a detection device capable of detecting a state around the vehicle; and a display unit visually recognizable by a driver. The driving assistance device includes: a memory; and a processor configured to: determine whether the two vehicles are allowed to pass each other based on the state, size information of a vehicle body of another vehicle, and a size of the vehicle body of the vehicle; search for, when determining that passing between the two vehicles is not performable, a first evacuation candidate area to which the vehicle is allowed to evacuate based on the state detected along a traveling trajectory of the vehicle by the detection device; and display a search result of the first evacuation candidate area on the display unit.

Abstract: A wireless communication device according to the present disclosure is set to be mounted on a vehicle including at least one wheel. The wireless communication device includes an input circuit, and an output circuit. The input circuit is set to connect to a lean angle detection circuit capable of detecting a lean angle of the vehicle with a traveling direction of the vehicle as a rotation axis. The output circuit is configured to repeatedly transmit a wireless signal including at least a position of the vehicle, a speed of the vehicle, and the lean angle of the vehicle at predetermined time intervals.

Abstract: A wireless communication device mountable in a vehicle acquires first position information on the vehicle and receives a packet signal from another wireless communication device, the packet signal including second position information on another vehicle in which the other wireless communication device is mounted. The wireless communication device has a storage that stores log information and a controller. The controller predicts whether the vehicle crosses the other vehicle at a point of crossing based on the first position information and the second position information, estimates a structure of crossing corresponding to the point of crossing based on the history information, and determines, when it is predicted that the vehicle crosses the other vehicle at the point of crossing, whether or not to notify a presence of the other vehicle to a driver of the vehicle, in accordance with the structure of crossing corresponding to the point of crossing.

Abstract: A wireless communication device mountable in a vehicle acquires first position information on the vehicle and receives a packet signal from another wireless communication device, the packet signal including second position information on another vehicle in which the other wireless communication device is mounted. The wireless communication device has a storage that stores log information and a controller. The controller predicts whether the vehicle crosses the other vehicle at a point of crossing based on the first position information and the second position information, estimates a structure of crossing corresponding to the point of crossing based on the history information, and determines, when it is predicted that the vehicle crosses the other vehicle at the point of crossing, whether or not to notify a presence of the other vehicle to a driver of the vehicle, in accordance with the structure of crossing corresponding to the point of crossing.

Abstract: A wireless communication device mountable in a vehicle acquires first position information on the vehicle and receives a packet signal from another wireless communication device, the packet signal including second position information on another vehicle in which the other wireless communication device is mounted. The wireless communication device has a storage that stores log information and a controller. The controller predicts whether the vehicle crosses the other vehicle at a point of crossing based on the first position information and the second position information, estimates a structure of crossing corresponding to the point of crossing based on the history information, and determines, when it is predicted that the vehicle crosses the other vehicle at the point of crossing, whether or not to notify a presence of the other vehicle to a driver of the vehicle, in accordance with the structure of crossing corresponding to the point of crossing.

Abstract: A wireless communication device mountable in a vehicle acquires first position information on the vehicle and receives a packet signal from another wireless communication device, the packet signal including second position information on another vehicle in which the other wireless communication device is mounted. The wireless communication device has a storage that stores log information and a controller. The controller predicts whether the vehicle crosses the other vehicle at a point of crossing based on the first position information and the second position information, estimates a structure of crossing corresponding to the point of crossing based on the history information, and determines, when it is predicted that the vehicle crosses the other vehicle at the point of crossing, whether or not to notify a presence of the other vehicle to a driver of the vehicle, in accordance with the structure of crossing corresponding to the point of crossing.

Abstract: A control information extraction unit receives information on a frame that contains at least a plurality slots from an access control apparatus for controlling communications between radio apparatuses. The control information extraction unit generates a frame that contains at least a plurality of slots in such a manner as to synchronize with the frame corresponding to the received information. An estimation unit estimates empty slots in the plurality of slots generated. A selection unit selects, at random, at least one of the estimated. A modem unit and the like broadcast data using the selected slot.

Abstract: An RF unit and a modem unit receive a packet signal, containing information regarding a frame construction, which is transmitted from a base station apparatus in a first period of a frame at least including first periods and second periods. An extraction unit identifies the second period in the frame, based on the received packet signal. A setting unit sets a waiting time period in the identified second period. A carrier sensing unit carries out carrier sensing over the waiting time period set by the setting unit. The modem unit and the RF unit broadcast the packet signal based on a result of the carrier sensing.

Abstract: It is specified that a frame containing at least the plurality of slots is repeated. A detecting unit detects a slot usable in the communications between terminal apparatuses, from among a plurality of slots. A modem unit and an RF unit broadcast the information on the detected slot. A power measuring unit in the detecting unit measures the respective received powers of the plurality of slots, and an empty slot identifying unit identifies a slot whose received power is less than a threshold value.

Abstract: A control information extraction unit receives information on a frame that contains at least a plurality slots from an access control apparatus for controlling communications between radio apparatuses. The control information extraction unit generates a frame that contains at least a plurality of slots in such a manner as to synchronize with the frame corresponding to the received information. An estimation unit estimates empty slots in the plurality of slots generated. A selection unit selects, at random, at least one of the estimated. A modem unit and the like broadcast data using the selected slot.

Abstract: A control information extraction unit receives information on a frame that contains at least a plurality slots from an access control apparatus for controlling communications between radio apparatuses. The control information extraction unit generates a frame that contains at least a plurality of slots in such a manner as to synchronize with the frame corresponding to the received information. An estimation unit (82) estimates empty slots in the plurality of slots generated. A selection unit selects, at random, at least one of the estimated. A modem unit and the like broadcast data using the selected slot.

Abstract: It is specified in a manner such that a frame containing a first period formed by a plurality of slots and a second period having a predetermined length is repeated. A detecting unit detects a slot, which is usable for the communications between a plurality of other terminal apparatuses, from among a plurality of slots in the first period of a frame containing the first period and the second period. A modem unit and an RF unit broadcast information on the detected slot.

Abstract: A data processing unit selects either one of a base station mode and a terminal mode so as to perform communications using packet signals. The base station mode is a mode in which a packet signal, containing data indicating that an initial source and a final destination are not its own radio apparatus, is to be communicated; the terminal mode is a mode in which a packet signal, containing data indicating that the initial source or the final destination is its own radio apparatus, is to be communicated. A control unit starts the radio apparatus by setting the data processing unit in the terminal mode. When a packet signal, which has been transmitted from another radio apparatus and which contains broadcast information, has not been received before a certain period of time elapses after the start, the control unit switches the mode of the data processing unit to the base station mode.

Abstract: An RF unit and a modem unit receive a packet signal, containing information regarding a frame construction, which is transmitted from a base station apparatus in a first period of a frame at least including first periods and second periods. An extraction unit identifies the second period in the frame, based on the received packet signal. A setting unit sets a waiting time period in the identified second period. A carrier sensing unit carries out carrier sensing over the waiting time period set by the setting unit. The modem unit and the RF unit broadcast the packet signal based on a result of the carrier sensing.

Abstract: A packet communication unit and a signal processing unit communicate with a plurality of terminals, respectively, in an infrastructure mode. A control unit controls the communications performed by the packet communication unit and the signal processing unit. The control unit permits two of the plurality of terminal apparatuses to communicate with each other in an ad-hoc mode, over a predetermined period time, and specifies the ad-hoc period to at least the two terminal apparatuses via the packet communication unit and the signal processing unit.

Abstract: A base station apparatus controls inter-terminal communication. A frame in which a first period in which the base station apparatus may broadcast a signal, a second period in which the terminal apparatus may broadcast the signal, and a third period in which one-to-one transmission of the signal between the base station apparatus and the terminal apparatus may be performed are time-division multiplexed is defined. A processing unit generates information about a configuration of the frame. A modem unit and an RF unit broadcast the signal in which the generated information is included in the first period. The RF unit, the modem unit, and the processing unit receive the signal broadcasted from the terminal apparatus in the second period. The RF unit, the modem unit, and the processing unit perform one-to-one communication with the terminal apparatus in the third period.

Abstract: A setting unit defines the first frame and the second frame and selects use of the first frame or the second frame. A generation unit generates control information which is defined by the same format regardless of the selection by the setting unit and which includes at least information related to the base station broadcast period. The generation unit puts information related to the ratio between the priority period and the general period into the control information and reflects the selection by the setting unit to the ratio. The modem unit and the RF unit broadcast a packet signal including the control information in the base station broadcast period.

Abstract: A radio unit transmits a packet signal. An acquiring unit acquires information about a traveling status of a vehicle. When the acquired information indicates a stop of the vehicle, an instructing unit allows the radio unit to stop transmitting the packet signal. A position detecting unit detects, based on positional information of the vehicle, whether the vehicle is present in a predetermined area. If the position detecting unit detects presence, the instructing unit allows the radio unit to continue transmitting the packet signal even when the information acquired by the acquiring unit indicates the stop of the vehicle.

Abstract: A base station apparatus controls inter-terminal communication. Basic information containing information about a first period and extended information containing the information about a second period and a third period are defined and a generation unit generates a packet signal containing an identifier to identify whether the basic information of the basic information and the extended information is contained in the packet signal or the basic information and the extended information are contained in the packet signal. A modem unit and an RF unit broadcast the packet signal containing the identifier generated by the generation unit.

Abstract: A data rate is to be determined depending on circumstances. A control unit (30) transmits, at a predetermined frequency, a request signal by which to supply information on a data rate to a targeted radio apparatus compatible with a variable data rate. The control unit (30) receives rate information from the targeted radio apparatus. The control unit (30) sets a data rate used in the case of transmitting data, based on the information on a data rate contained in the rate information. The control unit (30) identifies the reliability level of the data rate contained in the rate information. And when the reliability level is low, the control unit (30) lowers the frequency at which the rate request signal is transmitted.