Implementation method and system for avoiding adjacent channel interference in electronic toll of collection (ETC)

Abstract

The invention discloses an implementation method and device for avoiding adjacent channel interference in electronic toll of collection (ETC). The method comprises the following steps that: an on-board unit (OBU) receives a beacon service table (BST) signal transmitted by a road-side unit (RSU), records a channel number field identifier of the RSU in the BST and establishes a communication link with the RSU, wherein RSUs of adjacent lanes are provided with different channel number field identifiers; and when the OBU receives the BST signal once again in an area covered by an RSU antenna, the OBU verifies a channel number field identifier in the BST, determines that the BST signal which is received once again is transmitted by the RSU if the channel number field identifier is consistent with the recorded channel number field identifier, and completes charging operation with the RSU in response to the BST signal which is received once again. After the method and the device are adopted, two communicating parties are arranged at the same fixed frequency point during a transaction between the RSU and the OBU, so that the probability of adjacent channel interference is effectively lowered.

Description

technical field [0001] The present invention relates to the technical field of dedicated short range communication (Dedicated Short Range Communication, DSRC), in particular to a method and device for avoiding adjacent channel interference in an ETC system. Background technique [0002] The Electronic Toll of Collection (ETC) is a system that uses professional short-range microwave communication technology to exchange information between the Road-Side Unit (RSU) and the On-Board Unit (OBU). It is a fully automatic charging method that automatically completes the deduction of vehicle tolls when the driver does not stop and the toll collector performs any payment operation. ETC technology has the advantages of fast passing without parking, high traffic capacity and service level, exemption from cash transactions, simplified toll management, and reduced environmental pollution. [0003] The roadside unit RSU refers to the reader and antenna located on the lane. It is connected...

AI Technical Summary

Problems solved by technology

If the OBU on the adjacent channel has just completed the entry transaction and completes the exit transaction because of this RSU, the OBU will be deducted at the maximum milestone; if the OBU on the adjacent channel has not completed the entry transaction and then trades with this RSU, it will be charged because there is no entry information. Make the transaction fail, resulting in a traffic jam in this lane

[0005] In the actual system, because the installation of the RSU antenna is not in compliance with the specifications and there are deviations; the design of the RSU antenna is unreasonable; the design of the OBU is unreasonable and the consistency is not good; Adjacent channel interference problem

[0006] In solving the problem of adjacent channel interference, although it is possible to standardize the engineering installation of the RSU antenna, optimize the design of the RSU antenna, and improve the consistency of the OBU, etc., the solution period of these methods is relatively long and the cost is high. In the lane environment, there will still be adjacent channel interference problems due to signal reflection and refraction

Images