PROBLEM TO BE SOLVED: To make it possible to increase the possibility that an optical beacon may appropriately receive a high-speed frame transmitted after a low-speed frame from an on-vehicle apparatus in road-to-vehicle communication performed between the optical beacon and the on-vehicle apparatus that support multiple rates in an uplink direction.SOLUTION: An on-vehicle device is mounted on a vehicle and performs wireless communication with an optical beacon installed on a road by an optical signal. The on-vehicle device comprises: a light receiving unit capable of photoelectric conversion at a prescribed transmission speed; a light transmitting unit capable of electro-optical conversion at two types of high and low transmission speeds; and a communication control unit capable of transmitting one or more high-speed frames after transmission of a low-speed frame. The communication control unit re-transmits a prescribed high-speed frame when a prescribed condition is met.SELECTED DRAWING: Figure 16
【課題】アップリンク方向でマルチレート対応の光ビーコンと車載機との間で行う路車間通信において、車載機から低速フレームの後に送信される高速フレームを光ビーコンが適切に受信する可能性を高めることができるようにする。【解決手段】車両に搭載されるとともに、道路に設置された光ビーコンと光信号による無線通信を行う車載機であって、所定の伝送速度での光電気変換が可能な光受信部と、高低2種類の伝送速度での電気光変換が可能な光送信部と、低速フレームの送信後に1又は複数の高速フレームを送信可能な通信制御部と、を備えており、前記通信制御部は、所定の条件を満たしたときに、所定の高速フレームを再送信する、車載機。【選択図】図16
ON-VEHICLE DEVICE AND OPTICAL BEACON
車載機及び光ビーコン
2017-04-13
Patent
Electronic Resource
Japanese