CN109831764A - A kind of method and system that the anti-monkey chatter suitable for OBU electronic tag is traded - Google Patents
A kind of method and system that the anti-monkey chatter suitable for OBU electronic tag is traded Download PDFInfo
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- CN109831764A CN109831764A CN201910127121.5A CN201910127121A CN109831764A CN 109831764 A CN109831764 A CN 109831764A CN 201910127121 A CN201910127121 A CN 201910127121A CN 109831764 A CN109831764 A CN 109831764A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a kind of method and system that the anti-monkey chatter suitable for OBU electronic tag is traded, it is identified using the wake-up interrupts that OBU can only receive the generation of this lane wake-up signal as judgment basis, the byte for including: the preceding second predetermined number threshold value for working as received data is the broadcast MAC of RSU, and when wake-up interrupts flag set, it is determined as the BST data in this lane in the case where link is not set up, continues to and reply the VST data of corresponding frequency band；When the byte of the second predetermined number threshold value is the dedicated MAC of OBU before received data, it is determined as the downlink frame data in this lane, continues to other bytes of the downlink frame data and reply uplink frame, establish communication link.OBU satisfaction receives this lane wake-up signal in technical solution of the present invention, and received BST data just regard as this lane useful signal again later, can effectively enhance the anti-monkey chatter of OBU；The downlink data predetermined number byte received compares in advance, can greatly shorten exchange hour.
Description
Technical field
The present invention relates to field of intelligent transportation technology, and more particularly, to a kind of suitable for the anti-of OBU electronic tag
The method and system of monkey chatter transaction.
Background technique
OBU electronic tag is the important component of electronic toll collection, logical based on 5.8GHz DSRC microwave
Letter technology, the vehicle equipped with OBU trigger ground induction coil when passing through the lane in which the drivers should pay fees, and interior RSU is communicated with standing, and completes vehicle card information school
It the functions such as tests, deduct fees and uploading network, driveway controller control rear vehicle of arguing for the sake of arguing passes through, and completes a transaction.Applied field
Scape is as shown in Figure 1.
OBU and RSU communication process can be divided into five stages: application message acquisition, information of vehicles acquisition, consumer sale,
User's prompt and link release.Application message acquisition, which is RSU, to be issued by 5.8GHz microwave channel and broadcasts BST, frame head 14KHz
Wake-up signal is for waking up OBU.Vehicle, which drives into behind transaction area, constantly to move ahead, when 14KHz wake-up signal reach OBU wake up it is sensitive
Range is spent, OBU, which wakes up and is in operating mode, to be started to receive BST data, and OBU receives and parses through correct return uplink VST data.
It is to issue the GetSecure.request instruction with the dedicated MAC of the OBU after RSU receives VST that information of vehicles, which obtains, and OBU is replied
Encryption data GetSecure.response with information of vehicles.Above two step is communication link foundation.Consumer sale is logical
It crosses the COMPREHENSIVE CALCULATINGs rates such as information of vehicles, entrance information, deduct card amount.User's prompt is by buzzer and liquid crystal display
Etc. modes prompt trading situation.Link release is to disconnect RSU and OBU to communicate to connect, and OBU is made to enter dormant state.
In practical applications, OBU is when passing through a plurality of parallel lane ETC, when excessively high because of OBU receiving sensitivity itself, meeting
It receives the downlink signal of neighboring trace RSU and establishes link and trade, lead to this lane Fail Transaction, reduce OBU and trade successfully
The arm's length dealing in this lane of rate severe jamming.
Therefore, it is necessary to a kind of methods of anti-monkey chatter to prevent neighbour to solve how accurately to judge monkey chatter signal
Interfere the problem of this lane arm's length dealing in lane.
Summary of the invention
The present invention proposes a kind of method and system that the anti-monkey chatter suitable for OBU electronic tag is traded, to solve such as
The problem of what accurately judges monkey chatter signal, prevents adjacent lane from interfering this lane arm's length dealing.
To solve the above-mentioned problems, according to an aspect of the invention, there is provided it is a kind of suitable for the anti-of OBU electronic tag
The method of monkey chatter transaction, which is characterized in that the described method includes:
Step 1, microwave data is received, and judges whether received microwave data is BST data, if so, entering step
2, conversely, entering step 3；
Step 2, the number for detecting default wakeup frequency signal, when the quantity for detecting default wakeup frequency signal is greater than etc.
When the first predetermined number threshold value, by wake-up interrupts flag set, and BST data are continued to；
Step 3, when the byte number of currently received data is equal to the second predetermined number threshold value, judge currently received number
The broadcast MAC that whether byte of the second predetermined number threshold value is RSU before if so, entering step 4, otherwise is entered step
6；
Step 4, when communication link is not set up, and when the set of wake-up interrupts mark, determine that currently received data are
The BST data in this lane；
Step 5, the VST data of reply corresponding frequency band are indicated according to the channel the BST frequency range in this lane received, and are returned
Step 1 continues to data；
Step 6, judge the preceding second predetermined number threshold value of currently received data byte whether the dedicated MAC for being OBU；
Step 7, it when the byte of the second predetermined number threshold value is the dedicated MAC of OBU before currently received data, determines
Currently received data are the downlink frame data in this lane, continue to other bytes of the downlink frame data, and reply uplink
Frame establishes communication link.
Preferably, wherein described judge whether received microwave data is that BST data include:
When received microwave data includes predeterminated frequency wake-up signal, determine that received microwave data is BST signal；Instead
It, it is determined that received microwave data is downlink frame data.
Preferably, wherein it is described when the quantity for detecting default wakeup frequency signal is more than or equal to the first predetermined number threshold value
When, by wake-up interrupts flag set, comprising:
When the quantity for detecting default wakeup frequency signal is more than or equal to the first predetermined number threshold, microwave chip wakes up output
The rising edge that pin generates level from low to high is jumped to micro-control unit MCU with wake-up interrupts pin, after MCU is interrupted wake-up
It is in running order, by wake-up interrupts flag set.
Preferably, wherein the method also includes:
After replying VST data, wake-up interrupts mark is removed in time, not removing to avoid interrupt identification causes to receive again
Neighboring trace BST data as make this lane BST signal, and generate erroneous judgement.
Preferably, wherein the method also includes:
When the byte of the second predetermined number threshold value is not the dedicated MAC of OBU before currently received data, determine current
Received data are this non-lane data or noise, directly give up and disregard.
Preferably, wherein the method also includes:
The byte of the second predetermined number threshold value is the broadcast MAC of RSU, and communication link before currently received data
When having been established, determines that currently received data are the BST data in this non-lane, directly give up and disregard.
According to another aspect of the present invention, provide what a kind of anti-monkey chatter suitable for OBU electronic tag was traded
System, which is characterized in that the system comprises:
Microwave data receiving unit for receiving microwave data, and judges whether received microwave data is BST data,
If so, into interrupt identification set unit, conversely, entering broadcast MAC judging unit；
Interrupt identification set unit, for detecting the number of default wakeup frequency signal, when detecting default wakeup frequency
When the quantity of signal is more than or equal to the first predetermined number threshold value, by wake-up interrupts flag set, and BST data are continued to；
MAC judging unit is broadcasted, for sentencing when the byte number of currently received data is equal to the second predetermined number threshold value
The broadcast the MAC whether byte of the preceding second predetermined number threshold value for currently received data of breaking is RSU；If so, into this vehicle
Road BST data determination unit, on the contrary enter VST data recovery unit；
This lane BST data determination unit, for not set up when communication link, and when the set of wake-up interrupts mark,
Determine that currently received data are the BST data in this lane；
VST data recovery unit, for replying corresponding frequency band according to the channel the BST frequency range instruction in this lane received
VST data, and enter microwave data receiving unit；
The dedicated MAC judging unit of OBU, for judging that the byte of the second predetermined number threshold value before currently received data is
The no dedicated MAC for OBU；
Communication link establishes unit, and the byte for the second predetermined number threshold value before currently received data is OBU
Dedicated MAC when, determine currently received data be this lane downlink frame data, continue to other of the downlink frame data
Byte, and uplink frame is replied, establish communication link.
Preferably, wherein the microwave data receiving unit, judges whether received microwave data is BST data, comprising:
When received microwave data includes predeterminated frequency wake-up signal, determine that received microwave data is BST signal；Instead
It, it is determined that received microwave data is downlink frame data.
Preferably, wherein the interrupt identification set unit, when the quantity for detecting default wakeup frequency signal is greater than etc.
When the first predetermined number threshold value, by wake-up interrupts flag set, comprising:
When the quantity for detecting default wakeup frequency signal is more than or equal to the first predetermined number threshold, microwave chip wakes up output
The rising edge that pin generates level from low to high is jumped to micro-control unit MCU with wake-up interrupts pin, after MCU is interrupted wake-up
It is in running order, by wake-up interrupts flag set.
Preferably, wherein the system also includes:
Wake-up interrupts mark clearing cell, for removing wake-up interrupts mark in time after replying VST data, to avoid
Interrupt identification does not remove the neighboring trace BST data for causing to receive again as the BST signal for making this lane, and generates erroneous judgement.
Preferably, wherein the communication link establishes unit, further includes:
When the byte of the second predetermined number threshold value is not the dedicated MAC of OBU before currently received data, determine current
Received data are this non-lane data or noise, directly give up and disregard.
Preferably, wherein described lane BST data determination unit, further includes:
The byte of the second predetermined number threshold value is the broadcast MAC of RSU, and communication link before currently received data
When having been established, determines that currently received data are the BST data in this non-lane, directly give up and disregard.
The present invention provides a kind of method and system that the anti-monkey chatter suitable for OBU electronic tag is traded, and utilize OBU
The wake-up interrupts of this lane wake-up signal generation can only be received as judgment basis, identify this road and monkey chatter signal, comprising:
The byte of the second predetermined number threshold value is the broadcast MAC of RSU before received data, and when wake-up interrupts flag set,
It determines that currently received data are the BST data in this lane in the case where link is not set up, continues to and according to receiving
This lane the channel BST frequency range instruction reply corresponding frequency band VST data；The second predetermined number threshold before received data
When the byte of value is the dedicated MAC of OBU, it is determined as the downlink frame data in this lane, continues to other of the downlink frame data
Byte, and uplink frame is replied, establish communication link；Otherwise it is assumed that neighboring trace data, give up and receive again.Technical side of the invention
OBU satisfaction receives this lane wake-up signal in case, and received BST data just regard as this lane useful signal again later, not
The BST for generating wake-up interrupts set, is determined as monkey chatter, not replys, can effectively enhance the anti-monkey chatter of OBU；It receives
To downlink data before predetermined number byte compare in advance, the condition of satisfaction is further continued for receiving other bytes of the data frame, otherwise
It is determined as monkey chatter, exchange hour can be greatly shortened, improves vehicle transaction success rate.
Detailed description of the invention
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by:
Fig. 1 is the application scenario diagram that OBU and RSU is communicated；
Fig. 2 is the method 200 traded according to the anti-monkey chatter suitable for OBU electronic tag of embodiment of the present invention
Flow chart；
Fig. 3 is the structural schematic diagram according to the OBU microwave wake-up circuit of embodiment of the present invention；
Fig. 4 is the instance graph according to the anti-monkey chatter of embodiment of the present invention；
Fig. 5 is the system 500 traded according to the anti-monkey chatter suitable for OBU electronic tag of embodiment of the present invention
Structural schematic diagram.
Specific embodiment
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be at large and fully disclose
The present invention, and the scope of the present invention is sufficiently conveyed to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon note.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related fields has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 2 is the method 200 traded according to the anti-monkey chatter suitable for OBU electronic tag of embodiment of the present invention
Flow chart.As shown in Fig. 2, the side that the anti-monkey chatter suitable for OBU electronic tag that embodiments of the present invention provide is traded
Method, only OBU satisfaction receive this lane wake-up signal, and received BST data just regard as this lane useful signal again later,
The BST for not generating wake-up interrupts set is determined as monkey chatter, not replys, and can effectively enhance the anti-monkey chatter of OBU；It connects
Predetermined number byte compares in advance before the downlink data received, and the condition of satisfaction is further continued for receiving other bytes of the data frame, no
Then it is determined as monkey chatter, exchange hour can be greatly shortened, improves vehicle transaction success rate.Embodiments of the present invention mention
The method 200 that the anti-monkey chatter suitable for OBU electronic tag supplied is traded, in step 201, is received since step 201 place
Microwave data, and judge whether received microwave data is BST data, if so, 202 are entered step, conversely, entering step
203。
Preferably, wherein described judge that received microwave data whether be BST data includes: when received microwave data packet
When wake-up signal containing predeterminated frequency, determine that received microwave data is BST signal；It is on the contrary, it is determined that received microwave data is
Downlink frame data.
Fig. 3 is the structural schematic diagram according to the OBU microwave wake-up circuit of embodiment of the present invention.As shown in figure 3, in this hair
In bright embodiment, OBU microwave wake-up circuit is made of 5.8GHz microwave antenna, microwave chip and micro-control unit MCU.It is micro-
Wave antenna and microwave chip are responsible for reception/transmission 5.8GHz microwave modulated signal, and only BST data frame head carries 14KHz and wakes up
Signal, other frames do not carry.Microwave chip is communicated with MCU by wake-up interrupts line and data line.
It is provided according to national standard GB/T 20851, it is (small that the receiving sensitivity (being less than -50dbm) of OBU is higher than wakeup sensitivity
In -40dbm), after such OBU is waken up, even if received signal power fluctuates, communication disruption will not be caused, is guaranteed
Transaction stability.OBU wakeup sensitivity requires setting lower, can guarantee not waken up frequently by noise signal etc., reach saving
Power consumption, the purpose for extending OBU battery life.The adjacent and runway BST wake-up signal that only this road RSU is issued can reach OBU
Wakeup sensitivity range；And OBU receiving sensitivity is often higher, when neighboring trace signal power is sufficiently large, although cannot be by neighboring trace
It wakes up, the road Dan Beizhe signal remains to receive neighboring trace signal after waking up, as premise.
The communication link between OBU and RSU is established due to needing to restore VST data according to the received BST data of OBU,
BST data when then receiving subsequent downlink frame data further according to the communication link of foundation, and establishing communication link and under
Whether the difference of row frame data is comprising wake-up signal.Therefore, it when establishing communication link, needs to call out according to whether detecting
Awake signal determines, is in the data transmission for carrying out downlink frame or in order to establish communication link.
Preferably, in step 202, the number of default wakeup frequency signal is detected, when detecting default wakeup frequency signal
Quantity be more than or equal to the first predetermined number threshold value when, by wake-up interrupts flag set, and continue to BST data.
Preferably, wherein it is described when the quantity for detecting default wakeup frequency signal is more than or equal to the first predetermined number threshold value
When, by wake-up interrupts flag set, comprising:
When the quantity for detecting default wakeup frequency signal is more than or equal to the first predetermined number threshold, microwave chip wakes up output
The rising edge that pin generates level from low to high is jumped to micro-control unit MCU with wake-up interrupts pin, after MCU is interrupted wake-up
It is in running order, by wake-up interrupts flag set.
Preferably, in step 203, when the byte number of currently received data is equal to the second predetermined number threshold value, judgement
The broadcast the MAC whether byte of the preceding second predetermined number threshold value of currently received data is RSU, if so, entering step
204, on the contrary enter step 206.
Preferably, in step 204, when communication link is not set up, and when the set of wake-up interrupts mark, determination is currently connect
The data of receipts are the BST data in this lane.
Preferably, wherein the method also includes:
The byte of the second predetermined number threshold value is the broadcast MAC of RSU, and communication link before currently received data
When having been established, determines that currently received data are the BST data in this non-lane, directly give up and disregard.
Preferably, in step 205, the VST for replying corresponding frequency band is indicated according to the channel the BST frequency range in this lane received
Data, and return step 201 continues to data.
Preferably, wherein the method also includes:
After replying VST data, wake-up interrupts mark is removed in time, not removing to avoid interrupt identification causes to receive again
Neighboring trace BST data as make this lane BST signal, and generate erroneous judgement.
Preferably, in step 206, judge the preceding second predetermined number threshold value of currently received data byte whether be
The dedicated MAC of OBU.
Preferably, in step 207, the byte of the second predetermined number threshold value is the special of OBU before currently received data
When with MAC, determines that currently received data are the downlink frame data in this lane, continue to other words of the downlink frame data
Section, and uplink frame is replied, establish communication link.
Preferably, wherein the method also includes:
When the byte of the second predetermined number threshold value is not the dedicated MAC of OBU before currently received data, determine current
Received data are this non-lane data or noise, directly give up and disregard.
The embodiment illustrated the present invention in detail below
Fig. 4 is the instance graph according to the anti-monkey chatter of embodiment of the present invention.As shown in figure 4, in implementation of the invention
In mode, the first predetermined number threshold value is 8, and the second predetermined number threshold value is 4, and the frequency for presetting wakeup frequency signal is 14kHz.
In embodiments of the present invention, it is necessary first to establish the communication link of OBU and RSU.When microwave chip receives BST
When signal, the number of 14KHz signal is detected, output pin is waken up when more than 8 14KHz signals and generates the upper of level from low to high
Rise along jump gives MCU wake-up interrupts pin, when MCU in a dormant state when, it is in running order after MCU is waken up, will wake up
Interrupt identification set, and continue to the BST data transmitted by microwave chip.
Because BST starts 4 bytes as broadcast MAC, to guarantee system quick response, stood after receiving more than 4 byte datas
Judge whether preceding 4 byte is broadcast MAC (whether preceding 4 byte is 0xFFFFFFFF), and current 4 byte is broadcast MAC, and is led to
Letter link is not set up also, when meeting wake-up interrupts flag set, then can determine that the BST being currently received is this lane data.OBU
The VST data (5.79GHz or 5.80GHz) of reply corresponding frequency band are indicated according to the channel the BST frequency range in this lane received, are protected
Card only have this lane RSU can receive VST, and the downlink available frame count for receiving the dedicated MAC of this OBU again according to when establish communicate
Link.Wake-up interrupts mark should be removed in time after replying VST data, and avoidance breakout mark is not removed, then when receiving neighboring trace BST
Erroneous judgement is generated as this road BST signal.
Wherein, before communication link is not set up, BST is such as received, then returns to the detection for re-starting wake-up signal, such as link
VST data are then no longer replied after foundation.
Wherein, if current 4 byte then illustrates the wake-up signal of the BST to broadcast MAC, but the non-set of wake-up interrupts mark
The wakeup sensitivity range of not up to OBU is neighboring trace signal, disregards.
When 4 bytes are the dedicated MAC of OBU before data, it is determined that currently received data are the downlink frame in this lane
Data, continue to other bytes of the downlink frame data, and reply uplink frame, establish communication link, complete data transmission
Laggard line link release.Wherein, downlink frame data includes: GetSecure, TransferChannel, SetMMI, Event_
Report.Since downlink frame data is all bundled with the dedicated MAC Address of the OBU, so 4 bytes are before only receiving every frame data
The data of the dedicated MAC of OBU, the preceding unequal data information of 4 byte are regarded as monkey chatter information, are disregarded.
When 4 bytes are not the dedicated MAC of OBU before data, it is determined that received data are this non-lane data or make an uproar
Sound data, are disregarded.
In embodiments of the present invention, using OBU can only receive this lane wake-up signal generation wake-up interrupts as
Judgment basis identifies this road and monkey chatter signal, at the same dock receive downlink data preceding 4 byte compare, for example broadcast MAC and
Wake up sign set continues to BST when link is not set up and replys VST；If preceding 4 byte is the dedicated MAC of this OBU
Other data of the frame are continued to, otherwise it is assumed that neighboring trace data, give up and receive again.Compared to original technology, received by each
Complete data carry out RSSI comparison again, monkey chatter signal can be more accurately judged, when quickly establishing link, while shortening transaction
Between, improve vehicle transaction success rate.
Fig. 5 is the system 500 traded according to the anti-monkey chatter suitable for OBU electronic tag of embodiment of the present invention
Structural schematic diagram.As shown in figure 5, the anti-monkey chatter suitable for OBU electronic tag that embodiments of the present invention provide is traded
System 500, comprising: microwave data receiving unit 501, interrupt identification set unit 502, broadcast MAC judging unit 503, this
Lane BST data determination unit 504, VST data recovery unit 505, the dedicated MAC judging unit 506 of OBU and communication link are established
Unit 507.
Preferably, the microwave data receiving unit 501 for receiving microwave data, and judges received microwave data
It whether is BST data, if so, into interrupt identification set unit 502, conversely, entering broadcast MAC judging unit 503.
Preferably, wherein the microwave data receiving unit 501, judges whether received microwave data is BST data, packet
It includes: when received microwave data includes predeterminated frequency wake-up signal, determining that received microwave data is BST signal；Conversely, then
Determine that received microwave data is downlink frame data.
Preferably, the interrupt identification set unit 502 works as detection for detecting the number of default wakeup frequency signal
To default wakeup frequency signal quantity be more than or equal to the first predetermined number threshold value when, by wake-up interrupts flag set, and continue
Receive BST data.
Preferably, wherein the interrupt identification set unit 502, when the quantity for detecting default wakeup frequency signal is greater than
When equal to the first predetermined number threshold value, by wake-up interrupts flag set, comprising: when the quantity for detecting default wakeup frequency signal
More than or equal to the first predetermined number threshold, the rising edge that microwave chip wake-up output pin generates level from low to high is jumped to micro-control
Unit MCU processed with wake-up interrupts pin, MCU be interrupted wake-up after it is in running order, by wake-up interrupts flag set.
Preferably, it is pre- to be equal to second for the byte number when currently received data for the broadcast MAC judging unit 503
If when number threshold value, the broadcast the MAC whether byte of the preceding second predetermined number threshold value of currently received data is RSU judged；
If so, into this lane BST data determination unit 504, otherwise enter VST data recovery unit 505.
Preferably, this lane BST data determination unit 504, for not set up when communication link, and wake-up interrupts
When mark set, determine that currently received data are the BST data in this lane.
Preferably, wherein described lane BST data determination unit 504, further includes: before currently received data
The byte of two predetermined number threshold values is the broadcast MAC of RSU, and when communication link has been established, determines that currently received data are
The BST data in this non-lane, directly give up and disregard.
Preferably, the VST data recovery unit 505, for the channel the BST frequency range instruction according to this lane received
The VST data of corresponding frequency band are replied, and enter microwave data receiving unit.
Preferably, wherein the system also includes wake-up interrupts mark clearing cell, for after reply VST data, and
When remove wake-up interrupts mark, do not remove the neighboring trace BST data that cause to receive again to avoid interrupt identification as this lane of work
BST signal, and generate erroneous judgement.
Preferably, the dedicated MAC judging unit 506 of the OBU, for judging before currently received data second default
Number threshold values byte whether the dedicated MAC for being OBU.
Preferably, the communication link establishes unit 507, for the second predetermined number threshold before currently received data
When the byte of value is the dedicated MAC of OBU, determines that currently received data are the downlink frame data in this lane, continue under this
Other bytes of row frame data, and uplink frame is replied, establish communication link.
Preferably, wherein the communication link establishes unit 507, further includes: second is pre- before currently received data
If the byte of number threshold value is not the dedicated MAC of OBU, determine currently received data be this non-lane data or noise, directly
It connects to give up and disregard.
The system 500 and of the invention that the anti-monkey chatter suitable for OBU electronic tag of the embodiment of the present invention is traded
The method 200 that the anti-monkey chatter suitable for OBU electronic tag of another embodiment is traded is corresponding, and details are not described herein.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
Defined by subsidiary Patent right requirement, in addition to the present invention other embodiments disclosed above equally fall in it is of the invention
In range.
Normally, all terms used in the claims are all solved according to them in the common meaning of technical field
It releases, unless in addition clearly being defined wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate sequence, unless explicitly stated otherwise.
Claims (12)
1. a kind of method that the anti-monkey chatter suitable for OBU electronic tag is traded, which is characterized in that the described method includes:
Step 1, microwave data is received, and judges whether received microwave data is BST data, if so, entering step 2, instead
It, enters step 3；
Step 2, the number for detecting default wakeup frequency signal, when the quantity for detecting default wakeup frequency signal is more than or equal to the
When one predetermined number threshold value, by wake-up interrupts flag set, and BST data are continued to；
Step 3, when the byte number of currently received data is equal to the second predetermined number threshold value, judge currently received data
The broadcast the MAC whether byte of preceding second predetermined number threshold value is RSU if so, entering step 4, otherwise enters step 6；
Step 4, when communication link is not set up, and when the set of wake-up interrupts mark, determine that currently received data are this vehicle
The BST data in road；
Step 5, the VST data of reply corresponding frequency band, and return step are indicated according to the channel the BST frequency range in this lane received
1 continues to data；
Step 6, judge the preceding second predetermined number threshold value of currently received data byte whether the dedicated MAC for being OBU；
Step 7, it when the byte of the second predetermined number threshold value is the dedicated MAC of OBU before currently received data, determines current
Received data are the downlink frame data in this lane, continue to other bytes of the downlink frame data, and reply uplink frame, build
Vertical communication link.
2. judging whether received microwave data is BST data the method according to claim 1, wherein described
Include:
When received microwave data includes predeterminated frequency wake-up signal, determine that received microwave data is BST signal；Conversely,
Then determine that received microwave data is downlink frame data.
3. the method according to claim 1, wherein described ought detect that the quantity of default wakeup frequency signal is big
When being equal to the first predetermined number threshold value, by wake-up interrupts flag set, comprising:
When the quantity for detecting default wakeup frequency signal is more than or equal to the first predetermined number threshold, microwave chip wakes up output pin
The rising edge for generating level from low to high is jumped to micro-control unit MCU with wake-up interrupts pin, and MCU is in after being interrupted wake-up
Working condition, by wake-up interrupts flag set.
4. the method according to claim 1, wherein the method also includes:
After replying VST data, wake-up interrupts mark is removed in time, does not remove the neighbour for leading to receive again to avoid interrupt identification
Road BST data generate erroneous judgement as the BST signal for making this lane.
5. the method according to claim 1, wherein the method also includes:
When the byte of the second predetermined number threshold value is not the dedicated MAC of OBU before currently received data, current receive is determined
Data be this non-lane data or noise, directly give up and disregard.
6. the method according to claim 1, wherein the method also includes:
The byte of the second predetermined number threshold value is the broadcast MAC of RSU before currently received data, and communication link is built
Immediately, it determines that currently received data are the BST data in this non-lane, directly gives up and disregard.
7. a kind of system that the anti-monkey chatter suitable for OBU electronic tag is traded, which is characterized in that the system comprises:
Microwave data receiving unit for receiving microwave data, and judges whether received microwave data is BST data, if so,
Then enter interrupt identification set unit, conversely, entering broadcast MAC judging unit；
Interrupt identification set unit, for detecting the number of default wakeup frequency signal, when detecting default wakeup frequency signal
Quantity be more than or equal to the first predetermined number threshold value when, by wake-up interrupts flag set, and continue to BST data；
MAC judging unit is broadcasted, for when the byte number of currently received data is equal to the second predetermined number threshold value, judgement to be worked as
The broadcast the MAC whether byte of the preceding second predetermined number threshold value of preceding received data is RSU；If so, into this lane BST
Data determination unit, on the contrary enter VST data recovery unit；
This lane BST data determination unit is determined for not setting up when communication link, and when the set of wake-up interrupts mark
Currently received data are the BST data in this lane；
VST data recovery unit replys the VST of corresponding frequency band for the channel the BST frequency range instruction according to this lane received
Data, and enter microwave data receiving unit；
The dedicated MAC judging unit of OBU, for judge the second predetermined number threshold value before currently received data byte whether be
The dedicated MAC of OBU；
Communication link establishes unit, and the byte for the second predetermined number threshold value before currently received data is the special of OBU
When with MAC, determines that currently received data are the downlink frame data in this lane, continue to other bytes of the downlink frame data
And uplink frame is replied, establish communication link.
8. system according to claim 7, which is characterized in that the microwave data receiving unit judges received microwave
Whether data are BST data, comprising:
When received microwave data includes predeterminated frequency wake-up signal, determine that received microwave data is BST signal；Conversely,
Then determine that received microwave data is downlink frame data.
9. system according to claim 7, which is characterized in that the interrupt identification set unit is called out when detecting to preset
When the quantity of awake frequency signal is more than or equal to the first predetermined number threshold value, by wake-up interrupts flag set, comprising:
When the quantity for detecting default wakeup frequency signal is more than or equal to the first predetermined number threshold, microwave chip wakes up output pin
The rising edge for generating level from low to high is jumped to micro-control unit MCU with wake-up interrupts pin, and MCU is in after being interrupted wake-up
Working condition, by wake-up interrupts flag set.
10. system according to claim 7, which is characterized in that the system also includes:
Wake-up interrupts mark clearing cell, for removing wake-up interrupts mark, in time to avoid interruption after replying VST data
Mark does not remove the neighboring trace BST data for causing to receive again as the BST signal for making this lane, and generates erroneous judgement.
11. system according to claim 7, which is characterized in that the communication link establishes unit, further includes:
When the byte of the second predetermined number threshold value is not the dedicated MAC of OBU before currently received data, current receive is determined
Data be this non-lane data or noise, directly give up and disregard.
12. system according to claim 7, which is characterized in that this lane BST data determination unit, further includes:
The byte of the second predetermined number threshold value is the broadcast MAC of RSU before currently received data, and communication link is built
Immediately, it determines that currently received data are the BST data in this non-lane, directly gives up and disregard.
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