PROBLEM TO BE SOLVED: To provide a new on-vehicle machine capable of properly communicating with a new and old optical beacons and multi-rate compatible in an uplink direction.SOLUTION: An on-vehicle machine, which executes wireless communication by an optical signal with an optical beacon installed on a road, comprises: an optical transmission part capable of performing electro-optical conversion at two kinds of high and low transmission rates; an optical reception part capable of performing photoelectric conversion at a prescribed transmission rate; and a communication control part (on-vehicle control device) which executes preceding processing for setting transmission rate of a preceding frame U1 to a low rate, and subsequent processing for setting transmission rate of subsequent frames U2 to U4 to a high rate or for determining whether to set the subsequent frames U2 to U4 to non-transmission or to set the transmission rate thereof to a low rate.SELECTED DRAWING: Figure 8
【課題】新旧の光ビーコンと適切に通信できる、アップリンク方向でマルチレート対応の新車載機を提供する。【解決手段】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は、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、所定の伝送速度での光電気変換が可能な光受信部と、先行フレームU1の伝送速度を低速に設定する先行処理と、後続フレームU2〜U4の伝送速度を高速に設定するか、或いは、後続フレームU2〜U4を非送信に設定又はその伝送速度を低速に設定するかを決定する後続処理とを実行する通信制御部(車載制御機)とを備える。【選択図】図8
ON-VEHICLE MACHINE
車載機
2016-12-28
Patent
Elektronische Ressource
Japanisch
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