JP2013149235A5

JP2013149235A5 -

Info

Publication number: JP2013149235A5
Application number: JP2012176085A
Authority: JP
Filing date: 2012-08-08
Publication date: 2015-02-26
Anticipated expiration: 2032-01-11

Description

（１）本発明の車載機は、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、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、下りフレームに含まれるビーコン識別情報に基づいて、前記光ビーコンが高速アップリンク受信に対応する新光ビーコンか非対応の旧光ビーコンかを判定し、この判定結果に応じて、高速の伝送速度でアップリンク送信を行うか、低速の伝送速度でアップリンク送信を行う又は非送信に設定するかを切り替える通信制御部と、備える。 (1) The in-vehicle device of the present invention is an in-vehicle device that performs wireless communication using an optical beacon and an optical signal installed on a road, and an optical transmission unit capable of electro-optical conversion at two types of high and low transmission speeds; Whether the optical beacon is a new optical beacon that supports high-speed uplink reception or an unsupported old optical beacon based on an optical receiver capable of photoelectric conversion at a predetermined transmission rate and beacon identification information included in a downlink frame And a communication control unit that switches whether uplink transmission is performed at a high transmission rate, uplink transmission is performed at a low transmission rate, or non-transmission is set according to the determination result.

本発明の車載機によれば、通信相手が新光ビーコンの場合には、高速の伝送速度でアップリンク送信が行われ、通信相手が旧光ビーコンの場合には、低速の伝送速度でアップリンク送信が行われる又は非送信に設定されるので、新旧の光ビーコンと適切に通信することができる。
従って、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が得られる。 According to the vehicle-mounted device of the present invention, when the communication partner is a new optical beacon, uplink transmission is performed at a high transmission rate, and when the communication partner is an old optical beacon, uplink transmission is performed at a low transmission rate. Is set to non-transmission, it is possible to appropriately communicate with the old and new optical beacons.
Therefore, a new in-vehicle device that can appropriately communicate with the old and new optical beacons and supports multirate in the uplink direction can be obtained.

（２）本発明の車載機において、前記通信制御部は、高速アップリンク送信に対応する新車載機のための信号情報を含む下りフレームの送信を前記光ビーコンにダウンリンク送信させるための車載機識別情報を、上りフレームに含めることができることが好ましい。
このようにすれば、新車載機のための信号情報を含む下りフレームが旧車載機に誤ってダウンリンク送信されるのを確実に防止することができる。 (2) In the in-vehicle device according to the present invention, the communication control unit causes the optical beacon to transmit a downlink transmission including a downlink frame including signal information for a new in-vehicle device corresponding to high-speed uplink transmission. It is preferable that the identification information can be included in the upstream frame.
In this way, it is possible to reliably prevent the downlink frame including the signal information for the new in-vehicle device from being erroneously downlink transmitted to the old in-vehicle device.

Claims

An in-vehicle device that performs wireless communication with an optical beacon and an optical signal installed on a road,
An optical transmitter capable of electro-optical conversion at two transmission speeds, high and low,
An optical receiver capable of photoelectric conversion at a predetermined transmission rate;
Based on the beacon identification information included in the downstream frame, it is determined whether the optical beacon is a new optical beacon that supports high-speed uplink reception or an unsupported old optical beacon, and the transmission speed increases according to the determination result. A communication control unit that switches between performing link transmission, performing uplink transmission at a low transmission rate, or setting to non-transmission, and an in- vehicle device.

The communication control unit may include in-vehicle unit identification information for causing the optical beacon to perform downlink transmission including downlink signal transmission including signal information for a new in-vehicle device corresponding to high-speed uplink transmission in the upstream frame. The in-vehicle device according to claim 1 which can be performed .