PROBLEM TO BE SOLVED: To provide an optical beacon that can appropriately receive a high-speed frame transmitted after a low-speed frame, and copes with a multi-rate in an uplink direction.SOLUTION: An optical beacon 4 performs wireless communication with an on-vehicle device 2 on a travelling vehicle by optical signal. The optical beacon comprises: an optical reception unit 11 capable of photo-electric conversion at two types, high and low, of transmission speed; a beacon head 8 including an optical transmission unit 10 capable of electric-photo conversion at prescribed transmission speed; and a communication control unit (beacon controller) 7 capable of reproducing a low-speed frame or high-speed frame from an electric signal output by the optical reception unit 11. In addition, the communication control unit 7 can measure the uplink position of the low-speed frame from the electric signal output by the optical reception unit 11, and the communication control unit 7 performs downlink switching on the basis of the low-speed frame.SELECTED DRAWING: Figure 1

    【課題】低速フレームの後に送信される高速フレームを適切に受信できる、アップリンク方向でマルチレート対応の光ビーコンを提供する。【解決手段】走行中の車両の車載機2と光信号による無線通信を行う光ビーコン4は、高低2種類の伝送速度での光電気変換が可能な光受信部11と、所定の伝送速度での電気光変換が可能な光送信部10を有するビーコンヘッド8と、光受信部11が出力する電気信号から低速フレーム又は高速フレームを再生可能な通信制御部(ビーコン制御機)7とを備える。また、通信制御部7は、光受信部11が出力する電気信号から低速フレームのアップリンク位置を測定可能であり、通信制御部7は、低速フレームに基づくダウンリンク切り替えを行う。【選択図】図1


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    Title :

    OPTICAL BEACON


    Additional title:

    光ビーコン


    Contributors:
    HAYAMA KOJI (author)

    Publication date :

    2017-01-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS / G01S RADIO DIRECTION-FINDING , Funkpeilung / H04B TRANSMISSION , Übertragung



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