Method, equipment and system for controlling signal transmission time sequence of road side equipment

Abstract

The invention discloses a method for controlling the signal transmission time sequence of road side equipment, which is used for ensuring that vehicle-mounted equipment locks a correct channel. The method comprises the following steps of: determining first road side equipment and second road side equipment corresponding to any two adjacent lanes; and controlling the first road side equipment to transmit data with a preset byte size of a BST (Beacon Service Table) signal according to a first frequency, and then controlling the second road side equipment to transmit an interference signal according to a second frequency, Wherein the first road side equipment and the second road side equipment alternately transmit the BST signal and the interference signal according to the set period. The invention also discloses a system and equipment for controlling the signal transmission time sequence of the road side equipment.

Description

technical field [0001] The invention relates to the technical field of intelligent transportation, in particular to a method, device and system for controlling the timing sequence of signal transmission of roadside equipment. Background technique [0002] The electronic toll collection system (Electronic Toll Collection System, ETC) of the expressway adopts the dedicated short-range communication (Dedicated Short Range Communication, DSRC) technology to complete the roadside unit (Roadside Unit, RSU, referred to as the roadside equipment in this article) and the on-board unit (On Board Unit, Two-way communication between OBU, which is referred to as on-board equipment in this paper, performs data interaction through wireless communication, realizes security authentication and consumption deduction, so as to achieve the purpose of non-stop charging. [0003] However, unlike single-lane ETC, multi-lane ETC needs to solve the problem of adjacent lane interference. In the exist...

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Problems solved by technology

[0004] However, for a narrowband OBU, sending an interference signal will affect the channel locking of the OBU. The following two situations will be explained

[0005] In the first case, if figure 1 As shown, assuming that the vehicle is driving in lane 1, after the 14kHz wake-up square wave and BST (Beacon Service Table, Beacon Service Table) signal sent by the RSU of this road wakes up the OBU for the first time, the OBU enters the working state from the sleep state, but at this time The default setting in this OBU is the frequency corresponding to channel 0, and then the RSU in the adjacent lane sends the 14kHz wake-up square wave and BST signal with channel 0, and the RSU in this lane sends the interference signal of channel 1. The BST is sent at the same time or delayed. When the OBU is awakened again by the interference signal of the lane, its sensitivity to receive microwave data will be higher than the wake-up sensitivity, so it will receive BST according to the frequency corresponding to the default channel 0 (that is, the adjacent channel) Signal and confirm the physical channel, so that the channel of OBU will be locked to channel 0, resulting in channel locking error and transaction failure;

[0006] In the second case, if the attached figure 2 As shown, assuming that the vehicle is driving in the lane of channel 1, when the adjacent RSU sends a 14kHz wake-up square wave with channel 0 and BST, the RSU of this lane sends an interference signal with channel 1. After the interference signal wakes up the OBU for the first time, the OBU starts from Dormant state and working state, but at this time the default setting in the OBU is the frequency corresponding to channel 0, and then the RSU of this lane sends the 14kHz wake-up square wave and BST signal with channel 1, if the interference signal of the adjacent channel is sent at the same time or ahead of time , then when the OBU is awakened again by the BST signal of this lane, its receiving sensitivity is higher than the awakening sensitivity, and it will receive and send the interference signal according to the frequency corresponding to the 0 channel (that is, the adjacent channel) set by default and confirm the physical channel, so that the OBU The channel will be locked to channel 0, resulting in channel locking error and transaction failure

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