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A method and a system for resisting adjacent channel interference transaction of an OBU electronic tag

A technology of adjacent lane interference and electronic tags, which is applied in the field of anti-adjacent lane interference transactions, and can solve problems such as interfering with normal lane transactions

Active Publication Date: 2019-05-31
BEIJING YUNXINGYU TRAFFIC SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention proposes a method and system for anti-adjacent lane interference transactions suitable for OBU electronic tags to solve the problem of how to accurately judge adjacent lane interference signals and prevent adjacent lanes from interfering with normal transactions in this lane

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  • A method and a system for resisting adjacent channel interference transaction of an OBU electronic tag
  • A method and a system for resisting adjacent channel interference transaction of an OBU electronic tag
  • A method and a system for resisting adjacent channel interference transaction of an OBU electronic tag

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Embodiment approach

[0072] Figure 4 It is an example diagram of anti-adjacent channel interference according to an embodiment of the present invention. Such as Figure 4 As shown, in the embodiment of the present invention, the first preset number threshold is 8, the second preset number threshold is 4, and the frequency of the preset wake-up frequency signal is 14 kHz.

[0073] In the embodiment of the present invention, it is first necessary to establish a communication link between the OBU and the RSU. When the microwave chip receives the BST signal, it detects the number of 14KHz signals. When there are more than 8 14KHz signals, the wake-up output pin generates a rising edge transition from low to high level to the MCU wake-up interrupt pin. When the MCU is in a sleep state When the MCU wakes up, it is in the working state, sets the wakeup interrupt flag, and continues to receive the BST data transmitted by the microwave chip.

[0074] Because the first 4 bytes of BST are broadcast MAC, ...

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Abstract

The invention discloses an anti-adjacent channel interference transaction method and system suitable for an OBU electronic tag, the OBU can only receive the awakening interruption generated by the lane awakening signal to serve as a judgment basis for identification.The method comprises the following steps: when bytes of a second preset number of front thresholds of received data are broadcast MACof an RSU and a wake-up interrupt flag is set, determining the BST data as BST data of a lane under the condition that a link is not established, and continuously receiving and replying VST data of acorresponding frequency band; and when the bytes of the first preset number threshold value and the second preset number threshold value of the received data are special MAC of the OBU, determining the bytes as downlink frame data of the lane, continuously receiving other bytes of the downlink frame data and replying to an uplink frame, and establishing a communication link. According to the technical scheme provided by the invention, the OBU receives the lane wake-up signal and then the received BST data is identified as the effective signal of the lane, so that the adjacent lane interference resistance of the OBU can be effectively enhanced; and the received downlink data is compared with preset numeric nodes in advance, so that the transaction time can be greatly shortened.

Description

technical field [0001] The present invention relates to the technical field of intelligent transportation, and more specifically, relates to a method and system for anti-adjacent channel interference transactions suitable for OBU electronic tags. Background technique [0002] The OBU electronic tag is an important part of the electronic non-stop toll collection system. It is based on 5.8GHz DSRC microwave communication technology. When the vehicle equipped with the OBU passes through the toll lane, it triggers the ground sense coil and communicates with the RSU in the station to complete the card information verification and deduction. Fees and other functions are uploaded to the network, and the lane controller controls the vehicle to pass after lifting the pole to complete a complete transaction. Application scenarios such as figure 1 shown. [0003] The communication process between OBU and RSU can be divided into five stages: application information acquisition, vehicl...

Claims

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Application Information

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IPC IPC(8): H04W4/80H04W4/44H04W52/02G07B15/06
CPCY02D30/70
Inventor 张岱祥陈日强段起志冯勇平
Owner BEIJING YUNXINGYU TRAFFIC SCI & TECH
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