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Communication method for on board unit and road side unit of ETC system

A technology for in-vehicle equipment and roadside equipment, applied in ticketing equipment, instruments, etc., can solve the problems affecting the success rate of communication, increase the bit error rate, low transmission power, etc., and achieve the effect of improving communication quality and improving the success rate.

Active Publication Date: 2011-08-17
CHINA TRANSINFO TECH CORP
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AI Technical Summary

Problems solved by technology

The transmit power of the film car is 4dB lower than that of the non-film car, and the wake-up and receiving sensitivity is 4dBm weaker
Due to the existence of this difference, under the same roadside equipment receiving sensitivity communication conditions, the microwave signal strengths received by the OBUs of the two vehicles will be different. Under the same conditions, the signal strength is inversely proportional to the bit error rate. A weak signal may increase the bit error rate, thereby affecting the communication success rate

Method used

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  • Communication method for on board unit and road side unit of ETC system
  • Communication method for on board unit and road side unit of ETC system
  • Communication method for on board unit and road side unit of ETC system

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Embodiment Construction

[0051] In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0052] One of the core concepts of the embodiments of the present invention is that, according to the intensity information of the microwave signal received by the in-vehicle device during the communication process between the in-vehicle device and the roadside device, the current internal communication parameters of the in-vehicle device, such as wake-up sensitivity, receiving sensitivity, The transmission power is adjusted to adapt to the different installation environments of the on-board equipment, such as the angle, thickness and filming of the windshield of different cars, so as to improve the communication quality and improve the microwave communication between the on-board equipment and the roadside equipment of the ETC sy...

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Abstract

The invention discloses a communication method for an on board unit (OBU) and a road side unit (RSU) of an electronic toll collection (ETC) system. The method comprises that: the OBU receives microwave signals transmitted by the RSU, and acquires intensity information of the received microwave signals; the OBU adjusts internal communication parameters according to the intensity information of the microwave signals; and the OBU communicates with the RSU by adopting the internal communication parameters. The success rate of microwave communication between the OBU and the RSU of the ETC system can be improved by the method.

Description

technical field [0001] The present invention relates to the technical field of intelligent transportation ITSC, in particular to a communication method between an ETC system vehicle-mounted device and a roadside device, and an ETC system-mounted device. Background technique [0002] ETC (Electronic Toll Collection, fully automatic electronic toll collection or non-stop toll collection) system uses dedicated short-range wireless communication (Dedicated Short-Range Communication, DSRC) technology to complete the entire charging process, allowing vehicles to keep driving during the entire charging process without using parking. For this reason, it needs to install roadside equipment (RSU, Road Side Unit) at the toll point, install on-board equipment (OBU, On Board Unit, also known as on-board electronic label) on the driving vehicle, and use DSRC technology to complete the connection between RSU and OBU. Communication. [0003] Specifically, the OBU is a microwave device ins...

Claims

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Application Information

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IPC IPC(8): G07B15/06
Inventor 刘起昌赵志泳周双全张志平夏曙东
Owner CHINA TRANSINFO TECH CORP
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