CN109831764B - Method and system for adjacent channel interference resisting transaction suitable for OBU electronic tag - Google Patents
Method and system for adjacent channel interference resisting transaction suitable for OBU electronic tag Download PDFInfo
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Abstract
The invention discloses a method and a system for resisting adjacent channel interference transaction, which are suitable for an OBU (on-board unit) electronic tag, and the method and the system are used for identifying by taking awakening interruption generated by that the OBU can only receive an awakening signal of a current lane as a judgment basis, and comprise the following steps: when the bytes of the first second preset number threshold of the received data are broadcast MAC of RSU and the awakening interrupt flag is set, determining the data as BST data of the lane under the condition that the link is not established, and continuously receiving and replying VST data of the corresponding frequency band; and when the bytes of the first preset number threshold of the received data are the special MAC of the OBU, determining the data to be the downlink frame data of the lane, continuously receiving other bytes of the downlink frame data, replying an uplink frame, and establishing a communication link. According to the technical scheme, the OBU receives the lane wake-up signal, and then the received BST data is determined as the effective signal of the lane, so that the adjacent lane interference resistance of the OBU can be effectively enhanced; the preset number of bytes of the received downlink data is compared in advance, so that the transaction time can be greatly shortened.
Description
Technical Field
The invention relates to the technical field of intelligent transportation, in particular to an adjacent channel interference resisting transaction method and system suitable for an OBU electronic tag.
Background
The OBU electronic tag is an important component of an electronic toll collection system, and is based on a 5.8GHz DSRC microwave communication technology, a ground sensing coil is triggered when a vehicle with the OBU passes through a toll lane, the vehicle is communicated with an RSU in a station, functions of checking vehicle card information, deducting fees and the like are completed, a network is uploaded, and a lane controller controls the vehicle to pass after lifting a rod, so that one-time complete transaction is completed. The application scenario is shown in fig. 1.
The OBU and RSU communication process can be divided into five phases: application information acquisition, vehicle information acquisition, consumption transaction, user prompt and link release. The application information acquisition is that the RSU issues broadcast BST through a 5.8GHz microwave channel, and a frame header is a 14KHz wake-up signal for waking up the OBU. And continuously advancing after the vehicle enters the transaction area, when the 14KHz awakening signal reaches the OBU awakening sensitivity range, the OBU awakens and is in a working mode to start receiving BST data, and the OBU receives and analyzes the correctly returned uplink VST data. The vehicle information acquisition is that the RSU sends a GetSecure request instruction with the special MAC of the OBU after receiving the VST, and the OBU replies encrypted data GetSecure request with the vehicle information. The above two steps are communication link establishment. The consumption transaction is to calculate the rate and deduct the amount in the card through vehicle information, entrance and exit information and the like. The user prompt is to prompt the transaction condition through a buzzer, a liquid crystal display and the like. The link release is to disconnect the communication connection between the RSU and the OBU, so that the OBU enters a dormant state.
In practical application, when an OBU passes through a plurality of parallel ETC lanes, due to the fact that the receiving sensitivity of the OBU is too high, a downlink signal of an adjacent-lane RSU is received and a link is established for transaction, so that the transaction of the lane fails, the transaction success rate of the OBU is reduced, and normal transaction of the lane is seriously interfered.
Therefore, a method for resisting adjacent channel interference is needed to solve the problem of how to accurately judge the adjacent channel interference signal and prevent the adjacent channel from interfering the normal transaction of the own channel.
Disclosure of Invention
The invention provides an adjacent channel interference resisting transaction method and system suitable for an OBU (on-board unit) electronic tag, which are used for solving the problem of how to accurately judge an adjacent channel interference signal and prevent an adjacent channel from interfering normal transaction of a current channel.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method for resisting adjacent channel interference transaction suitable for an OBU electronic tag, the method comprising:
step 1, receiving microwave data, and judging whether the received microwave data is BST data, if so, entering step 2, otherwise, entering step 3;
step 2, detecting the number of the preset awakening frequency signals, setting an awakening interrupt flag when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold value, and continuously receiving BST data;
step 3, when the byte number of the currently received data is equal to a second preset number threshold, judging whether the byte of the first second preset number threshold of the currently received data is the broadcast MAC of the RSU, if so, entering step 4, otherwise, entering step 6;
step 4, when the communication link is not established and the awakening interrupt mark is set, determining the currently received data as BST data of the lane;
step 6, judging whether the bytes of a first preset number threshold of the currently received data are the special MAC of the OBU or not;
and 7, when the bytes of the first preset number threshold of the currently received data are the special MAC of the OBU, determining that the currently received data are the downlink frame data of the lane, continuously receiving other bytes of the downlink frame data, replying an uplink frame, and establishing a communication link.
Preferably, the determining whether the received microwave data is BST data includes:
when the received microwave data contains a preset frequency wake-up signal, determining the received microwave data as a BST signal; otherwise, the received microwave data is determined to be downlink frame data.
Preferably, the setting a wake-up interrupt flag when the number of the detected preset wake-up frequency signals is greater than or equal to a first preset number threshold includes:
when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold, the microwave chip awakens the output pin to generate jump from low to high level rising edges to the micro control unit MCU so as to awaken the interrupt pin, the MCU is in a working state after being awakened by interrupt, and an awakening interrupt flag is set.
Preferably, wherein the method further comprises:
after the VST data is replied, the awakening interrupt mark is cleared in time so as to avoid the situation that the adjacent channel BST data which is received again is taken as the BST signal of the lane and the misjudgment is generated because the interrupt mark is not cleared.
Preferably, wherein the method further comprises:
and when the bytes of the first second preset number threshold of the currently received data are not the special MAC of the OBU, determining that the currently received data are non-own-lane data or noise, and directly discarding and not processing the data.
Preferably, wherein the method further comprises:
and when the bytes of the first second preset number threshold of the currently received data are the broadcast MAC of the RSU and a communication link is established, determining that the currently received data are BST data of a non-local lane, and directly abandoning and not processing the BST data.
According to another aspect of the present invention, there is provided a system for anti-splatter transaction for OBU electronic tags, the system comprising:
the microwave data receiving unit is used for receiving microwave data and judging whether the received microwave data is BST data, if so, the interruption flag setting unit is entered, otherwise, the broadcast MAC judging unit is entered;
the interrupt flag setting unit is used for detecting the number of the preset awakening frequency signals, setting the awakening interrupt flag when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold value, and continuously receiving the BST data;
the broadcast MAC judging unit is used for judging whether the bytes of the currently received data with the first preset number threshold are broadcast MAC of the RSU or not when the byte number of the currently received data is equal to the first preset number threshold; if yes, entering a BST data determining unit of the lane, otherwise entering a VST data replying unit;
the lane BST data determining unit is used for determining currently received data as the BST data of the lane when the communication link is not established and the awakening interrupt mark is set;
the VST data reply unit is used for replying VST data of a corresponding frequency band according to the received BST channel frequency band indication of the lane and entering the microwave data receiving unit;
the OBU special MAC judging unit is used for judging whether the bytes of a first preset number threshold of the currently received data are the special MAC of the OBU or not;
and the communication link establishing unit is used for determining that the currently received data is downlink frame data of the lane when the bytes of the first preset number threshold of the currently received data are the special MAC of the OBU, continuously receiving other bytes of the downlink frame data, replying an uplink frame, and establishing the communication link.
Preferably, the determining, by the microwave data receiving unit, whether the received microwave data is BST data includes:
when the received microwave data contains a preset frequency wake-up signal, determining the received microwave data as a BST signal; otherwise, the received microwave data is determined to be downlink frame data.
Preferably, the setting unit of the interrupt flag sets the interrupt flag of waking up when detecting that the number of the preset wake-up frequency signals is greater than or equal to a first preset number threshold, including:
when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold, the microwave chip awakens the output pin to generate jump from low to high level rising edges to the micro control unit MCU so as to awaken the interrupt pin, the MCU is in a working state after being awakened by interrupt, and an awakening interrupt flag is set.
Preferably, wherein the system further comprises:
and the awakening interrupt mark clearing unit is used for clearing the awakening interrupt mark in time after the VST data is replied so as to avoid that the adjacent channel BST data which is received again is taken as the BST signal of the lane and the erroneous judgment is generated because the interrupt mark is not cleared.
Preferably, the communication link establishing unit further includes:
and when the bytes of the first second preset number threshold of the currently received data are not the special MAC of the OBU, determining that the currently received data are non-own-lane data or noise, and directly discarding and not processing the data.
Preferably, the lane BST data determining unit further includes:
and when the bytes of the first second preset number threshold of the currently received data are the broadcast MAC of the RSU and a communication link is established, determining that the currently received data are BST data of a non-local lane, and directly abandoning and not processing the BST data.
The invention provides a method and a system for resisting adjacent channel interference transaction suitable for an OBU (on-board unit) electronic tag, which identify an adjacent channel interference signal and a local channel by using awakening interruption generated by that the OBU can only receive the awakening signal of the local channel as a judgment basis, and comprise the following steps: when the bytes of the first second preset number threshold of the received data are broadcast MAC of the RSU and the awakening interrupt flag is set, determining that the currently received data are BST data of the lane under the condition that the link is not established, continuously receiving the BST data and replying the VST data of the corresponding frequency band according to the received BST channel frequency band indication of the lane; when the bytes of the first preset number threshold of the received data are the special MAC of the OBU, determining the bytes as the downlink frame data of the lane, continuously receiving other bytes of the downlink frame data, replying an uplink frame, and establishing a communication link; otherwise, the data of the adjacent channel is considered, and the data is abandoned for re-receiving. In the technical scheme of the invention, the OBU receives the wake-up signal of the lane, then the received BST data is determined as the effective signal of the lane, the BST of the wake-up interrupt set is not generated, the adjacent channel interference is determined, the response is not given, and the adjacent channel interference resistance of the OBU can be effectively enhanced; the preset number of bytes before the received downlink data is compared in advance, other bytes of the data frame are continuously received after the condition is met, otherwise, adjacent channel interference is judged, the transaction time can be greatly shortened, and the vehicle transaction success rate is improved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a diagram of an application scenario of OBU and RSU communication;
fig. 2 is a flow chart of a method 200 for anti-splatter transactions for OBU tags, according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an OBU microwave wake-up circuit according to an embodiment of the present invention;
FIG. 4 is a diagram of an example of adjacent channel interference rejection according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a system 500 for anti-splatter transaction for OBU electronic tags according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 2 is a flow chart of a method 200 for anti-splatter transactions for OBU tags, according to an embodiment of the present invention. As shown in fig. 2, according to the method for anti-adjacent-channel interference transaction of an OBU electronic tag provided by the embodiment of the present invention, only when the OBU receives the wake-up signal of the current lane, the received BST data is determined as the valid signal of the current lane, and the BST with the wake-up interrupt set is not generated, and is determined as the adjacent-channel interference, and does not reply, so that the OBU can effectively enhance the anti-adjacent-channel interference; the preset number of bytes before the received downlink data is compared in advance, other bytes of the data frame are continuously received after the condition is met, otherwise, adjacent channel interference is judged, the transaction time can be greatly shortened, and the vehicle transaction success rate is improved. The method 200 for adjacent channel interference resistant transaction of an OBU electronic tag according to the embodiment of the present invention starts with step 201, receives microwave data in step 201, and determines whether the received microwave data is BST data, if yes, step 202 is performed, otherwise step 203 is performed.
Preferably, the determining whether the received microwave data is BST data includes: when the received microwave data contains a preset frequency wake-up signal, determining the received microwave data as a BST signal; otherwise, the received microwave data is determined to be downlink frame data.
Fig. 3 is a schematic structural diagram of an OBU microwave wake-up circuit according to an embodiment of the present invention. As shown in fig. 3, in the embodiment of the present invention, the OBU microwave wake-up circuit is composed of a 5.8GHz microwave antenna, a microwave chip and a micro control unit MCU. The microwave antenna and the microwave chip are responsible for receiving/sending 5.8GHz microwave modulation signals, only the BST data frame header carries a 14KHz wake-up signal, and other frames do not carry the wake-up signal. The microwave chip and the MCU are communicated with the data line through a wake-up interrupt line.
According to the regulation of national standard GB/T20851, the receiving sensitivity (less than-50 dbm) of the OBU is higher than the awakening sensitivity (less than-40 dbm), so that even if the received signal power fluctuates after the OBU is awakened, the communication can not be interrupted, and the transaction stability is ensured. The OBU awakening sensitivity requirement is set to be low, frequent awakening by noise signals and the like can be avoided, and the purposes of saving power consumption and prolonging the service life of an OBU battery are achieved. Only the BST awakening signal issued by the RSU of the adjacent parallel lane can reach the awakening sensitivity range of the OBU; the OBU receiving sensitivity is often high, and when the power of the adjacent channel signal is large enough, the adjacent channel signal can still be received after being awakened by the local channel signal although the adjacent channel signal cannot be awakened.
Since it is necessary to restore VST data according to BST data received by the OBU to establish a communication link between the OBU and the RSU, and then receive subsequent downlink frame data according to the established communication link, the difference between BST data and downlink frame data when the communication link is established is whether a wake-up signal is included. Therefore, when establishing a communication link, it is necessary to determine whether to perform data transmission of a downlink frame or to establish the communication link, depending on whether or not the wake-up signal is detected.
Preferably, in step 202, the number of the preset wake-up frequency signals is detected, and when the number of the preset wake-up frequency signals is detected to be greater than or equal to the first preset number threshold, the wake-up interrupt flag is set, and BST data continues to be received.
Preferably, the setting a wake-up interrupt flag when the number of the detected preset wake-up frequency signals is greater than or equal to a first preset number threshold includes:
when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold, the microwave chip awakens the output pin to generate jump from low to high level rising edges to the micro control unit MCU so as to awaken the interrupt pin, the MCU is in a working state after being awakened by interrupt, and an awakening interrupt flag is set.
Preferably, in step 203, when the number of bytes of the currently received data is equal to the second preset number threshold, it is determined whether the bytes of the currently received data before the second preset number threshold are the broadcast MAC of the RSU, if yes, step 204 is performed, otherwise step 206 is performed.
Preferably, in step 204, when the communication link is not established and the wakeup interrupt flag is set, it is determined that the currently received data is BST data of the own lane.
Preferably, wherein the method further comprises:
and when the bytes of the first second preset number threshold of the currently received data are the broadcast MAC of the RSU and a communication link is established, determining that the currently received data are BST data of a non-local lane, and directly abandoning and not processing the BST data.
Preferably, in step 205, the VST data of the corresponding frequency band is replied according to the received BST channel frequency band indication of the current lane, and the step 201 is returned to continue to receive data.
Preferably, wherein the method further comprises:
after the VST data is replied, the awakening interrupt mark is cleared in time so as to avoid the situation that the adjacent channel BST data which is received again is taken as the BST signal of the lane and the misjudgment is generated because the interrupt mark is not cleared.
Preferably, in step 206, it is determined whether the bytes of the first second preset number threshold of the currently received data are the dedicated MAC of the OBU.
Preferably, in step 207, when the bytes of the currently received data, which is preceded by the second preset number threshold, are the dedicated MAC of the OBU, it is determined that the currently received data is downlink frame data of the current lane, and the other bytes of the downlink frame data are continuously received and an uplink frame is replied to establish a communication link.
Preferably, wherein the method further comprises:
and when the bytes of the first second preset number threshold of the currently received data are not the special MAC of the OBU, determining that the currently received data are non-own-lane data or noise, and directly discarding and not processing the data.
The following specifically exemplifies embodiments of the present invention
Fig. 4 is a diagram illustrating an example of adjacent channel interference resistance according to an embodiment of the present invention. As shown in fig. 4, 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.
In an embodiment of the present invention, a communication link between the OBU and the RSU needs to be established first. When the microwave chip receives BST signals, the number of the 14KHz signals is detected, when the number of the 14KHz signals exceeds 8 14KHz signals, the output pin is awakened to generate jump from low level to high level, the jump is sent to the MCU awakening interrupt pin, when the MCU is in a dormant state, the MCU is awakened to be in a working state, the awakening interrupt flag is set, and BST data transmitted by the microwave chip are continuously received.
Since the initial 4 bytes of the BST are broadcast MAC, to ensure fast response of the system, after receiving the data exceeding 4 bytes, it is immediately determined whether the first 4 bytes are broadcast MAC (whether the first 4 bytes are 0 xfffffffff), and the current 4 bytes are broadcast MAC, and a communication link is not established yet, and when the wake-up interrupt flag is set, it can be determined that the currently received BST is the channel data. And the OBU replies VST data (5.79GHz or 5.80GHz) of a corresponding frequency band according to the received BST channel frequency band indication of the lane, ensures that only the RSU of the lane can receive the VST, and establishes a communication link when the downlink effective frame data of the special MAC (media access control) of the OBU is received again. The wake-up interrupt flag should be cleared in time after the VST data is replied, so as to avoid the interrupt flag from not being cleared, and the adjacent channel BST is received again to be used as the BST signal of the local channel to generate misjudgment.
Before the communication link is not established, if the BST is received, the detection of the wake-up signal is returned again, and if the link is established, the VST data is not replied.
If the current 4 bytes are broadcast MAC, but the wakeup interrupt flag is not set, it indicates that the wakeup signal of the BST does not reach the wakeup sensitivity range of the OBU, and is an adjacent channel signal and is not processed.
And when the first 4 bytes of the data are the special MAC of the OBU, determining that the currently received data are the downlink frame data of the lane, continuously receiving other bytes of the downlink frame data, replying an uplink frame, establishing a communication link, and releasing the link after the data transmission is finished. Wherein the downlink frame data includes: GetSecure, transferChannel, SetMMI, Event _ Report. Because the downstream frame data is bound with the special MAC address of the OBU, only the data with the first 4 bytes of each frame data as the special MAC address of the OBU is received, and the data information with the unequal first 4 bytes is identified as adjacent channel interference information and is not processed.
When the first 4 bytes of the data are not the special MAC of the OBU, the received data are determined to be non-own-lane data or noise data and are not processed.
In the embodiment of the invention, the OBU is used for only receiving the awakening interruption generated by the awakening signal of the current lane as a judgment basis, identifying the interference signal of the current lane and the adjacent lane, simultaneously comparing the first 4 bytes of the received downlink data, if the comparison result is broadcast MAC and the awakening mark is set, continuously receiving BST and replying VST under the condition that a link is not established; if the former 4 bytes are the special MAC of the OBU, the special MAC continues to receive other data of the frame, otherwise, the special MAC considers the adjacent channel data and discards the adjacent channel data for re-reception. Compared with the prior art, the RSSI comparison is carried out after data are received each time, the adjacent channel interference signals can be judged more accurately, the link is established quickly, the transaction time is shortened, and the vehicle transaction success rate is improved.
Fig. 5 is a schematic structural diagram of a system 500 for anti-splatter transaction for OBU electronic tags according to an embodiment of the present invention. As shown in fig. 5, an embodiment of the present invention provides a system 500 for anti-splatter transaction for OBU electronic tags, including: a microwave data receiving unit 501, an interrupt flag setting unit 502, a broadcast MAC judgment unit 503, a own-lane BST data determination unit 504, a VST data reply unit 505, an OBU-dedicated MAC judgment unit 506, and a communication link establishment unit 507.
Preferably, the microwave data receiving unit 501 is configured to receive microwave data and determine whether the received microwave data is BST data, if so, enter the interrupt flag setting unit 502, and otherwise, enter the broadcast MAC determining unit 503.
Preferably, the determining, by the microwave data receiving unit 501, whether the received microwave data is BST data includes: when the received microwave data contains a preset frequency wake-up signal, determining the received microwave data as a BST signal; otherwise, the received microwave data is determined to be downlink frame data.
Preferably, the interrupt flag setting unit 502 is configured to detect the number of the preset wake-up frequency signals, set the wake-up interrupt flag when detecting that the number of the preset wake-up frequency signals is greater than or equal to a first preset number threshold, and continue to receive BST data.
Preferably, the setting unit 502 of the interrupt flag sets the wakeup interrupt flag when detecting that the number of the preset wakeup frequency signals is greater than or equal to the first preset number threshold, including: when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold, the microwave chip awakens the output pin to generate jump from low to high level rising edges to the micro control unit MCU so as to awaken the interrupt pin, the MCU is in a working state after being awakened by interrupt, and an awakening interrupt flag is set.
Preferably, the broadcast MAC determining unit 503 is configured to determine whether a byte of a second preset number threshold before the currently received data is a broadcast MAC of an RSU when the byte number of the currently received data is equal to the second preset number threshold; if yes, the lane BST data determination unit 504 is entered, otherwise, the lane BST data recovery unit 505 is entered.
Preferably, the BST data determining unit 504 of the local lane is configured to determine that currently received data is BST data of the local lane when the communication link is not established and the wakeup interrupt flag is set.
Preferably, the lane BST data determining unit 504 further includes: and when the bytes of the first second preset number threshold of the currently received data are the broadcast MAC of the RSU and a communication link is established, determining that the currently received data are BST data of a non-local lane, and directly abandoning and not processing the BST data.
Preferably, the VST data replying unit 505 is configured to reply VST data of a corresponding frequency band according to the received BST channel frequency band indication of the current lane, and enter the microwave data receiving unit.
Preferably, wherein the system further comprises: and the awakening interrupt mark clearing unit is used for clearing the awakening interrupt mark in time after the VST data is replied so as to avoid that the adjacent channel BST data which is received again is taken as the BST signal of the lane and the erroneous judgment is generated because the interrupt mark is not cleared.
Preferably, the OBU dedicated MAC determining unit 506 is configured to determine whether a second preset number threshold of bytes of the currently received data is a dedicated MAC of the OBU.
Preferably, the communication link establishing unit 507 is configured to determine that the currently received data is downlink frame data of the current lane, continue to receive other bytes of the downlink frame data, reply an uplink frame, and establish the communication link when the byte of the second preset number threshold before the currently received data is the special MAC of the OBU.
Preferably, the communication link establishing unit 507 further includes: and when the bytes of the first second preset number threshold of the currently received data are not the special MAC of the OBU, determining that the currently received data are non-own-lane data or noise, and directly discarding and not processing the data.
The system 500 for adjacent channel interference resistant transaction for an OBU electronic tag according to the embodiment of the present invention corresponds to the method 200 for adjacent channel interference resistant transaction for an OBU electronic tag according to another embodiment of the present invention, and will not be described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (8)
1. A method for anti-splatter transaction for OBU tags, the method comprising:
step 1, receiving microwave data, and judging whether the received microwave data is BST data, if so, entering step 2, otherwise, entering step 3;
step 2, detecting the number of the preset awakening frequency signals, setting an awakening interrupt flag when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold value, and continuously receiving BST data;
step 3, when the byte number of the currently received data is equal to a second preset number threshold, judging whether the byte of the first second preset number threshold of the currently received data is the broadcast MAC of the RSU, if so, entering step 4, otherwise, entering step 6;
step 4, when the communication link is not established and the awakening interrupt mark is set, determining the currently received data as BST data of the lane;
step 5, replying VST data of a corresponding frequency band according to the received BST channel frequency band indication of the lane, and returning to the step 1 to continue receiving the data;
step 6, judging whether the bytes of a first preset number threshold of the currently received data are the special MAC of the OBU or not;
step 7, when the bytes of the first preset number threshold of the currently received data are the special MAC of the OBU, determining that the currently received data are the downlink frame data of the lane, continuously receiving other bytes of the downlink frame data, replying an uplink frame, and establishing a communication link;
wherein the method further comprises:
when the bytes of the first preset number threshold of the currently received data are not the special MAC of the OBU, determining that the currently received data are non-vehicle channel data or noise, and directly discarding and not processing the data;
and when the bytes of the first second preset number threshold of the currently received data are the broadcast MAC of the RSU and a communication link is established, determining that the currently received data are BST data of a non-local lane, and directly abandoning and not processing the BST data.
2. The method of claim 1, wherein the determining whether the received microwave data is BST data comprises:
when the received microwave data contains a preset frequency wake-up signal, determining the received microwave data as a BST signal; otherwise, the received microwave data is determined to be downlink frame data.
3. The method of claim 1, wherein setting a wake-up interrupt flag when detecting that the number of preset wake-up frequency signals is greater than or equal to a first preset number threshold comprises:
when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold, the microwave chip awakens the output pin to generate jump from low to high level rising edges to the micro control unit MCU so as to awaken the interrupt pin, the MCU is in a working state after being awakened by interrupt, and an awakening interrupt flag is set.
4. The method of claim 1, further comprising:
after the VST data is replied, the awakening interrupt mark is cleared in time so as to avoid the situation that the adjacent channel BST data which is received again is taken as the BST signal of the lane and the misjudgment is generated because the interrupt mark is not cleared.
5. A system for anti-splatter transactions adapted for OBU tags, the system comprising:
the microwave data receiving unit is used for receiving microwave data and judging whether the received microwave data is BST data, if so, the interruption flag setting unit is entered, otherwise, the broadcast MAC judging unit is entered;
the interrupt flag setting unit is used for detecting the number of the preset awakening frequency signals, setting the awakening interrupt flag when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold value, and continuously receiving the BST data;
the broadcast MAC judging unit is used for judging whether the bytes of the currently received data with the first preset number threshold are broadcast MAC of the RSU or not when the byte number of the currently received data is equal to the first preset number threshold; if yes, entering a BST data determining unit of the lane, otherwise entering a VST data replying unit;
the lane BST data determining unit is used for determining currently received data as the BST data of the lane when the communication link is not established and the awakening interrupt mark is set;
the VST data reply unit is used for replying VST data of a corresponding frequency band according to the received BST channel frequency band indication of the lane and entering the microwave data receiving unit;
the OBU special MAC judging unit is used for judging whether the bytes of a first preset number threshold of the currently received data are the special MAC of the OBU or not;
a communication link establishing unit, configured to determine that the currently received data is downlink frame data of the lane when a byte of a second preset number threshold before the currently received data is a special MAC of the OBU, continue to receive other bytes of the downlink frame data and reply an uplink frame, and establish a communication link;
wherein, the communication link establishing unit further includes:
when the bytes of the first preset number threshold of the currently received data are not the special MAC of the OBU, determining that the currently received data are non-vehicle channel data or noise, and directly discarding and not processing the data;
the lane BST data determining unit further includes:
and when the bytes of the first second preset number threshold of the currently received data are the broadcast MAC of the RSU and a communication link is established, determining that the currently received data are BST data of a non-local lane, and directly abandoning and not processing the BST data.
6. The system of claim 5, wherein the microwave data receiving unit determines whether the received microwave data is BST data, and comprises:
when the received microwave data contains a preset frequency wake-up signal, determining the received microwave data as a BST signal; otherwise, the received microwave data is determined to be downlink frame data.
7. The system of claim 5, wherein the interrupt flag setting unit sets the wakeup interrupt flag when detecting that the number of the preset wakeup frequency signals is greater than or equal to a first preset number threshold, and comprises:
when the number of the preset awakening frequency signals is detected to be larger than or equal to a first preset number threshold, the microwave chip awakens the output pin to generate jump from low to high level rising edges to the micro control unit MCU so as to awaken the interrupt pin, the MCU is in a working state after being awakened by interrupt, and an awakening interrupt flag is set.
8. The system of claim 5, further comprising:
and the awakening interrupt mark clearing unit is used for clearing the awakening interrupt mark in time after the VST data is replied so as to avoid that the adjacent channel BST data which is received again is taken as the BST signal of the lane and the erroneous judgment is generated because the interrupt mark is not cleared.
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| CN112017310A (en) * | 2020-07-20 | 2020-12-01 | 广州市凌特电子有限公司 | Vehicle monitoring method and road network monitoring system under condition of electromagnetic interference |
| CN111818480B (en) * | 2020-09-07 | 2021-01-15 | 四川科道芯国智能技术股份有限公司 | OBU (on-board unit) testing method and system |
| CN115550873B (en) * | 2021-06-30 | 2024-10-18 | 华为技术有限公司 | Communication method and communication device |
| CN114373237B (en) * | 2021-12-15 | 2024-05-14 | 北京万集科技股份有限公司 | Control method and device of road side unit, road side unit and storage medium |
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