CN117560753B - OBU (on-board unit) false wake-up and portal transaction success rate optimization method - Google Patents
OBU (on-board unit) false wake-up and portal transaction success rate optimization method Download PDFInfo
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Abstract
The invention relates to a method for optimizing the success rate of OBU (on-board unit) mistakenly awakening and portal transaction, which comprises the following steps: step 110, controlling the OBU to carry out dormancy initialization; step 120, judging whether the OBU is awakened by 5.8G, if not, starting operation according to a preset function, repeating step 120, and if yes, turning to step 130; 130, starting a DSRC transaction flow and timing, and obtaining timing duration after finishing DSRC transaction; step 140, dynamically adjusting the receiving sensitivity according to the relation between the timing duration and the transaction time threshold and whether the received first BST is a portal; step 150, calibrating the wake-up bandwidth, and setting a false wake-up level and a corresponding wake-up sensitivity according to the false wake-up frequency record value; step 160, controlling the OBU to go to sleep with the calibrated wake-up bandwidth, the set false wake-up level and the corresponding wake-up sensitivity. The invention not only solves the problem of reducing the electric quantity consumption of the OBU, but also can optimize the success rate of the OBU to wake up the portal transaction by mistake from the source.
Description
Technical Field
The invention relates to the technical field of OBU (on-board unit), in particular to a method for optimizing the success rate of an OBU wrongly awakening and portal transaction.
Background
The ETC products on the market usually need to use a special 5.8G radio frequency chip, and after the test, the chip is found to be possibly activated and awakened by the signals of adjacent channels or the radio frequency signals of a mobile phone and a base station, so that the waste of extra equipment electric quantity is caused on one hand, and the normal ETC transaction is influenced on the other hand, and the ETC use experience of a user is influenced.
The method for resisting false wake-up of the OBU existing on the market at present is as described in the patent number CN 103731908A: according to the method, after the wake-up signal coupled into the MCU is a false wake-up signal and the MCU is awakened by mistake, the MCU enters a sleep mode and cuts into an interrupt trigger state, and the coupled wake-up signal is processed in the interrupt trigger state, so that the consumption of the electric quantity of the OBU is reduced.
Disclosure of Invention
The invention aims to at least solve one of the defects in the prior art and provides an OBU false wake-up and portal transaction success rate optimization method.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
specifically, an optimization method for the success rate of the OBU to wake up with the portal transaction by mistake is provided, which comprises the following steps:
step 110, controlling the OBU to carry out dormancy initialization;
step 120, judging whether the OBU is awakened by 5.8G, if not, starting operation according to a preset function, repeating step 120, and if yes, turning to step 130;
130, starting a DSRC transaction flow and timing, and obtaining timing duration after finishing DSRC transaction;
step 140, judging whether the timing duration exceeds the transaction time threshold, if yes, turning the false wake-up time record value +1 to step 150, if not, judging whether the BST is received, if not, turning the false wake-up time record value +1 to step 150, if the BST is received, resetting the timing duration, the false wake-up time record value and the false wake-up level, then judging whether the received first BST is a BST associated with a door frame, if yes, turning up the receiving sensitivity of the OBU and returning to step 130 for operation, and if not, directly returning to step 130 for operation;
step 150, calibrating the wake-up bandwidth, and setting a false wake-up level and a corresponding wake-up sensitivity according to the false wake-up frequency record value;
step 160, controlling the OBU to go to sleep with the calibrated wake-up bandwidth, the set false wake-up level and the corresponding wake-up sensitivity.
Further, specifically, sleep initialization refers to initializing the wakeup bandwidth, the false wakeup level, and the corresponding wakeup sensitivity of the OBU, and the receive sensitivity of the OBU.
Further, specifically, the process of increasing the reception sensitivity of the OBU includes,
the receiving sensitivity of the OBU is adjusted by a first preset step length every time, the adjusted spectrometer reading is obtained, the error rate after each adjustment is used as a judging standard, when the error rate is lower than a preset threshold value, the receiving sensitivity of the corresponding OBU is the final receiving sensitivity and is not adjusted any more, specifically, the following relational expression is satisfied when the OBU interacts with a portal antenna,
，
wherein, pt: transmitting power, unit W; pr: received power, unit W; gt: transmitting antenna gain, unit dBi; gr: receiving antenna gain, unit dBi; lambda: the wavelength of the center frequency of 5.8GHz is constant, and the unit is mm; d: the distance between the transmitting antenna and the receiving antenna is in m; l: the system loss factors irrelevant to propagation comprise line loss, microstrip line insertion loss and impedance mismatch insertion loss;
based on the above relationship, when subjected to a spectrometer test, there is the following relationship,
，
wherein, PL: path attenuation is calculated based on L; pt0: transmitting cable insertion loss, negative constant; pr0: receiving cable attenuation, negative; pr: the power of the spectrometer, the spectrometer reading,
wherein the mast antenna corresponds to the transmitting antenna and the OBU corresponds to the receiving antenna.
Further, specifically, the wake-up bandwidth is calibrated, and the false wake-up level and the corresponding wake-up sensitivity thereof are set according to the false wake-up number record value, including,
presetting a reference value of wake-up sensitivity, and setting N gears, namely false wake-up grades, for each gear which is reduced by MdBm by the reference value;
judging whether the false wake-up level is greater than 0 level,
if the number of the false wake-up times is larger than 0, judging whether the number of the false wake-up times is larger than a first preset number of times, if the number of the false wake-up times is larger than the first preset number of times, judging whether the number of the false wake-up times is largest, if the number of the false wake-up times is not larger than the first preset number of times, the number of the false wake-up times cannot be reduced, calibrating the wake-up bandwidth, namely converging to 14K square wave bandwidth, then enabling the user to sleep, if the number of the false wake-up times is not yet regulated to the largest, increasing the number of the false wake-up times, namely reducing the wake-up sensitivity, and if the number of the false wake-up times is not larger than the first preset number of times, giving an alarm;
if the number of the false wake-up times is not more than 0, judging whether the number of the false wake-up times is more than a second preset number of times, if the number of the false wake-up times is not more than the second preset number of times, not adjusting, if the number of the false wake-up times is more than the second preset number of times, judging whether the false wake-up level is maximum, if the number of the false wake-up times is not more than the second preset number of times, the number of the false wake-up levels cannot be reduced, if the number of the false wake-up levels is maximum, the corrected wake-up bandwidth is converged to 14K square wave bandwidth, and if the number of the false wake-up levels is not regulated to the maximum, the false wake-up level is increased, and if the number of the false wake-up levels is not regulated to the maximum, the false wake-up sensitivity is reduced.
Further, specifically, M is 1, n is 6, the first preset number is 2000 times, and the second preset number is 1000 times.
Further, specifically, calibrating the wakeup bandwidth, i.e., converging the 14K square wave bandwidth, includes,
and (3) carrying out wake-up bandwidth adjustment by using a second preset step length every time, testing by using a preset interference signal source scheme, and obtaining the wake-up bandwidth when the preset interference signal source scheme cannot wake up by mistake, namely, the final wake-up bandwidth is not adjusted any more.
Further, the actual wake-up bandwidth interval is 13.0Khz to 15.42Khz.
The invention also provides an optimization device for the success rate of the OBU to wake up the portal transaction by mistake, which comprises the following steps:
the initialization module is used for controlling the OBU to carry out sleep initialization;
the wake-up state judging module is used for judging whether the OBU is awakened by 5.8G, if not, starting operation according to a preset function and repeatedly operating the wake-up state judging module, and if yes, turning to the operation transaction timing module;
the transaction timing module is used for starting the DSRC transaction flow and timing, and obtaining timing duration after finishing DSRC transaction;
the transaction duration judging module is used for judging whether the timing duration exceeds a transaction time threshold, if yes, the error wake-up time record value +1 is transferred to the step 150, if not, whether the BST is received, if not, the error wake-up time record value +1 is transferred to the parameter adjusting module for operation, if the BST is received, the timing duration, the error wake-up time record value and the error wake-up level are reset, then whether the received first BST is the BST related to the portal is judged, if yes, the receiving sensitivity of the OBU is increased and the operation of the transaction timing module is returned, and if not, the operation of the transaction timing module is directly returned;
the parameter adjustment module is used for calibrating the wake-up bandwidth and setting the false wake-up level and the corresponding wake-up sensitivity according to the false wake-up frequency record value;
and the dormancy module is used for controlling the OBU to enter dormancy according to the calibrated wakeup bandwidth, the set false wakeup level and the corresponding wakeup sensitivity.
Further, specifically, sleep initialization refers to initializing the wakeup bandwidth, the false wakeup level, and the corresponding wakeup sensitivity of the OBU, and the receive sensitivity of the OBU.
The beneficial effects of the invention are as follows:
the invention provides an optimization method of the OBU false wake-up and portal transaction success rate, which is characterized in that the wake-up transaction process of the OBU is analyzed, the receiving sensitivity and the calibration wake-up bandwidth of the OBU are dynamically adjusted according to the actual situation in the wake-up transaction process of the OBU, and the false wake-up level and the corresponding wake-up sensitivity thereof are set according to the record value of the false wake-up times, so that the method is used as the parameter operation of the next wake-up transaction process of the OBU, the problem of reducing the electric quantity consumption of the OBU is solved, and the OBU false wake-up and portal transaction success rate can be optimized from the source.
Drawings
The above and other features of the present disclosure will become more apparent from the detailed description of the embodiments illustrated in the accompanying drawings, in which like reference numerals designate like or similar elements, and which, as will be apparent to those of ordinary skill in the art, are merely some examples of the present disclosure, from which other drawings may be made without inventive effort, wherein:
FIG. 1 is a schematic diagram of an optimization method for the success rate of the OBU to wake up with a portal transaction by mistake;
FIG. 2 is a schematic diagram of a preferred embodiment of the present invention for calibrating wake-up bandwidth and setting a false wake-up level and its corresponding wake-up sensitivity according to a value of a false wake-up number record.
Detailed Description
The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present invention. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The same reference numbers will be used throughout the drawings to refer to the same or like parts.
Referring to fig. 1, embodiment 1, based on the above-mentioned idea, the invention provides a method for optimizing the success rate of the OBU false wake-up and portal transaction, which comprises the following steps:
step 110, controlling the OBU to carry out dormancy initialization;
step 120, judging whether the OBU is awakened by 5.8G, if not, starting operation according to a preset function, repeating step 120, and if yes, turning to step 130;
130, starting a DSRC transaction flow and timing, and obtaining timing duration after finishing DSRC transaction;
step 140, judging whether the timing duration exceeds the transaction time threshold, if yes, turning the false wake-up time record value +1 to step 150, if not, judging whether the BST is received, if not, turning the false wake-up time record value +1 to step 150, if the BST is received, resetting the timing duration, the false wake-up time record value and the false wake-up level, then judging whether the received first BST is a BST associated with a door frame, if yes, turning up the receiving sensitivity of the OBU and returning to step 130 for operation, and if not, directly returning to step 130 for operation;
step 150, calibrating the wake-up bandwidth, and setting a false wake-up level and a corresponding wake-up sensitivity according to the false wake-up frequency record value;
step 160, controlling the OBU to go to sleep with the calibrated wake-up bandwidth, the set false wake-up level and the corresponding wake-up sensitivity.
As a preferred embodiment of the present invention, specifically, sleep initialization refers to initializing the wakeup bandwidth, the false wakeup level, and the corresponding wakeup sensitivity of the OBU, and the reception sensitivity of the OBU.
As a preferred embodiment of the present invention, specifically, the process of increasing the reception sensitivity of the OBU includes,
the receiving sensitivity of the OBU is adjusted by a first preset step length every time, the adjusted spectrometer reading is obtained, the error rate after each adjustment is used as a judging standard, when the error rate is lower than a preset threshold value, the receiving sensitivity of the corresponding OBU is the final receiving sensitivity and is not adjusted any more, specifically, the following relational expression is satisfied when the OBU interacts with a portal antenna,
，
wherein, pt: transmitting power, unit W; pr: received power, unit W; gt: transmitting antenna gain, unit dBi; gr: receiving antenna gain, unit dBi; lambda: the wavelength of the center frequency of 5.8GHz is constant, and the unit is mm; d: the distance between the transmitting antenna and the receiving antenna is in m; l: the system loss factors irrelevant to propagation comprise line loss, microstrip line insertion loss and impedance mismatch insertion loss, and the loss of radio waves only has relation with propagation distance and wave frequency; only distance is relevant given the frequency of the signal. In an actual propagation environment, the environmental factor n is also considered, and the formula is simplified to l=38.45+10×n×log (dBm). n is generally 2-5 according to the environment;
based on the above relationship, when subjected to a spectrometer test, there is the following relationship,
，
wherein, PL: path attenuation is calculated based on L; pt0: transmitting cable insertion loss, negative constant; pr0: receiving cable attenuation, negative; pr: the power of the spectrometer, the spectrometer reading,
wherein the mast antenna corresponds to the transmitting antenna and the OBU corresponds to the receiving antenna.
In the preferred embodiment, the adjustment of the sensitivity according to the antenna IDs of the portal and the lane is considered comprehensively, the aerial data of other lanes are easy to receive when the sensitivity is too high on the lane, the OBU is used as a response device, only one message can be received at the same time, the interference of adjacent lanes can be reduced by reducing the sensitivity, the waiting time of the reception is reduced, and the rapid transaction is achieved, and the dormancy and the electricity saving are achieved. The portal is set up in the middle of the expressway, so that the signal intensity of the antenna is very high, and meanwhile, the antenna is also strongly received, so that the portal can also realize the transaction under the condition that the user needs to wake up further, the receiving sensitivity needs to be improved (the receiving sensitivity is a certain degree=transaction sensitivity),
the wireless communication between the OBU and the RSU comprises a broadcast belonging to a public link (), wherein the broadcast content comprises an antenna ID, a channel number, unix time and a read-ahead instruction with some attributes. The RSU, after receiving the public link acknowledgement of the OBU, issues a message (one-to-one) instruction for the private link to transact. When the OBU wakes up to receive the broadcast frame of the first RSU, it will determine the first byte in the antenna ID, and national standard specifies that it is greater than 0xA0 as the portal antenna. When judging that the receiving sensitivity needs to be increased after the portal frame, a 5.8G special chip manufacturer provides a mode of adjusting the receiving sensitivity (alias AGC, automatic gain control, gain of an action amplifying circuit is automatically adjusted according to the strength of a signal, so that the level change of an output signal is less) that a configuration table with more than 10 steps of sensitivity is arranged in the chip according to SPI,
the path loss is analyzed in terms of gain and no gain, respectively:
the path loss in free space, when there is gain, is:
in the absence of gain, i.e., the antenna has unity gain, both GT and GR are 1, and the path loss is PL (dB):
for example, when the transmitting and receiving antennas are 1 meter apart, d=1 meter, λ=0.0517 m, then the air attenuation is:
；
for example, when the transmitting and receiving antennas are 2 meters apart, d=2 meters, λ=0.0517 m, then the air attenuation is:
；
for example, when the transmitting and receiving antennas are 4 meters apart, d=4 meters, λ=0.0517 m, then the air attenuation is:
；
for example, when the transmitting and receiving antennas are 8 meters apart, d=8 meters, λ=0.0517 m, then the air attenuation is:
，
in a laboratory environment we use the calibrated antenna and vector signal source to test the actual receive sensitivity according to the formula and select a two-gear configuration for use, the method: and transmitting a signal of 0dbm to a spectrum analyzer by using a vector signal source, using the spectrum analyzer to see actual attenuation at a test distance of one meter, then setting a bit error rate test mode to test receiving sensitivity, and finally selecting 2 gears in a sensitivity configuration table given by a manufacturer to be used for adjustment.
The method is characterized in that the method is to increase the receiving sensitivity, which is set to be about-62 dbm, is relatively low, the adjacent channel interference exists because of complex lane environment, the sensitivity is suitable, a plurality of antennas are arranged on a portal antenna, but the portal antenna is the same in ID, the portal antenna is the same as the portal antenna in communication, an opposite antenna controller can automatically select the portal antenna, the receiving sensitivity is relatively high, which is set to be about-74 dbm, the highest speed per hour of a highway is 120KM/h, 33 meters per second is taken, and the whole transaction time is about hundreds of milliseconds.
In the preferred embodiment, specifically, the wake-up bandwidth is calibrated, and the false wake-up level and the corresponding wake-up sensitivity thereof are set according to the value of the record of false wake-up times, including,
presetting a reference value of wake-up sensitivity, and setting N gears, namely false wake-up grades, for each gear which is reduced by MdBm by the reference value;
judging whether the false wake-up level is greater than 0 level,
if the number of the false wake-up times is larger than 0, judging whether the number of the false wake-up times is larger than a first preset number of times, if the number of the false wake-up times is larger than the first preset number of times, judging whether the number of the false wake-up times is largest, if the number of the false wake-up times is not larger than the first preset number of times, the number of the false wake-up times cannot be reduced, calibrating the wake-up bandwidth, namely converging to 14K square wave bandwidth, then enabling the user to sleep, if the number of the false wake-up times is not yet regulated to the largest, increasing the number of the false wake-up times, namely reducing the wake-up sensitivity, and if the number of the false wake-up times is not larger than the first preset number of times, giving an alarm;
if the number of the false wake-up times is not more than 0, judging whether the number of the false wake-up times is more than a second preset number of times, if the number of the false wake-up times is not more than the second preset number of times, not adjusting, if the number of the false wake-up times is more than the second preset number of times, judging whether the false wake-up level is maximum, if the number of the false wake-up times is not more than the second preset number of times, the number of the false wake-up levels cannot be reduced, if the number of the false wake-up levels is maximum, the corrected wake-up bandwidth is converged to 14K square wave bandwidth, and if the number of the false wake-up levels is not regulated to the maximum, the false wake-up level is increased, and if the number of the false wake-up levels is not regulated to the maximum, the false wake-up sensitivity is reduced.
In the preferred embodiment, the setting of the false wake-up level and the corresponding wake-up sensitivity is only a matter of improvement, if the mobile phone is near or has serious false wake-up when viewing the video internet, and the decrease of the wake-up sensitivity has an influence on the transaction of the OBU. Later, we calculate the bandwidth of the wake-up frequency of 14K by converging the bandwidth (the configuration recommended by the manufacturer is not center aligned, if the configuration is too narrow, the lower limit is too high, the lower limit is released, and the upper limit is also higher), taking out the value obtained by the calibration of the chip, calculating the value to the inside of the radio frequency chip, then making a large number of tests, converging the wake-up frequency of 14K to 13-15K, aligning the center, considering that some ETC antennas may be designed to be out of standard, so the configuration is not too narrow, the effect is good, and the actual false wake-up test is performed.
Referring to fig. 2, where M is preferably 1, n is 6, the first preset number is 2000 times, and the second preset number is 1000 times.
In the preferred embodiment, the test method is used in the laboratory for radiation testing using a vector signal source plus a dual-ridge horn antenna. The OBU is set to wake-up test mode. And after awakening, the lamp is turned on, and then the lamp is quickly turned off in a dormant mode. A default factory setting for wake-up sensitivity, -48dBm, is set first, in this state down, 6 gears are set. Each gear is reduced by 1dBm of wake-up sensitivity, 0 gear is highest (factory default-48), 1 gear-47 dBm, and so on. The sensitivity of the first 1000 false wake-up steps to reduce one gear is set on the application layer, and the sensitivity of the next 2000 false wake-up steps to reduce one gear wake-up is calculated. If the gear can not be lowered any more, the 14K wake-up bandwidth is converged, and the factory default setting is restored after receiving the BST once or when the user wakes up the OBU manually through a key.
After the system is awakened, the system waits for 40ms after the initialization time, if the broadcast frame BST of the antenna is not received within 40ms, the system is judged to be awakened by mistake, the continuous power consumption after the awakening is 40mA/h, the power consumption in the sleep mode is 5.6uA, and the error awakening is about 10 times.
10.04S 40 mA/3600+0.0056mAh=0.0096 mAh=9.6 uAh. Solar charging in the case of indoor dim light is about 10-20 uA/h.
Wherein preferably, specifically, calibrating the wakeup bandwidth, i.e., converging the 14K square wave bandwidth, comprises,
and (3) carrying out wake-up bandwidth adjustment by using a second preset step length every time, testing by using a preset interference signal source scheme, and obtaining the wake-up bandwidth when the preset interference signal source scheme cannot wake up by mistake, namely, the final wake-up bandwidth is not adjusted any more.
Preferably, the actual wake-up bandwidth interval is 13.0 khz-15.42 khz.
In the preferred embodiment, the vector signal source is used to send a 14K square wave modulated onto a 5.83G carrier by a test method, the OBU is set to wake-up mode, and the OBU lights up after waking up and then quickly sleeps.
The OBU software configures the 5.8G dedicated chip wake-up auto-calibration enablement. The actual effect of testing on the signal source is to bias 13.7-16.2K towards the large direction. In this case the result of the automatic calibration stored in the register 7 is read by the SPI. Setting a manual calibration wake-up frequency, adding and subtracting the obtained result, writing into a setting register, looking at the actual wake-up frequency effect, and finally shifting the central point to a small offset, wherein the actual wake-up interval is 13.0 Khz-15.42 Khz, (the situation that some antennas cannot be hung too narrowly because of insufficient standards) is considered), and continuous sending of a broadcast frame BST by using an RSU is stable and continuous wake-up, and the mobile phone and WIFI interference is used for basically calling the wake-up.
The invention also provides an optimization device for the success rate of the OBU to wake up the portal transaction by mistake, which comprises the following steps:
the initialization module is used for controlling the OBU to carry out sleep initialization;
the wake-up state judging module is used for judging whether the OBU is awakened by 5.8G, if not, starting operation according to a preset function and repeatedly operating the wake-up state judging module, and if yes, turning to the operation transaction timing module;
the transaction timing module is used for starting the DSRC transaction flow and timing, and obtaining timing duration after finishing DSRC transaction;
the transaction duration judging module is used for judging whether the timing duration exceeds a transaction time threshold, if yes, the error wake-up time record value +1 is transferred to the step 150, if not, whether the BST is received, if not, the error wake-up time record value +1 is transferred to the parameter adjusting module for operation, if the BST is received, the timing duration, the error wake-up time record value and the error wake-up level are reset, then whether the received first BST is the BST related to the portal is judged, if yes, the receiving sensitivity of the OBU is increased and the operation of the transaction timing module is returned, and if not, the operation of the transaction timing module is directly returned;
the parameter adjustment module is used for calibrating the wake-up bandwidth and setting the false wake-up level and the corresponding wake-up sensitivity according to the false wake-up frequency record value;
and the dormancy module is used for controlling the OBU to enter dormancy according to the calibrated wakeup bandwidth, the set false wakeup level and the corresponding wakeup sensitivity.
As a preferred embodiment of the present invention, specifically, sleep initialization refers to initializing the wakeup bandwidth, the false wakeup level, and the corresponding wakeup sensitivity of the OBU, and the reception sensitivity of the OBU.
In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on this understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or system capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
While the present invention has been described in considerable detail and with particularity with respect to several described embodiments, it is not intended to be limited to any such detail or embodiments or any particular embodiment, but is to be construed as providing broad interpretation of such claims by reference to the appended claims in view of the prior art so as to effectively encompass the intended scope of the invention. Furthermore, the foregoing description of the invention has been presented in its embodiments contemplated by the inventors for the purpose of providing a useful description, and for the purposes of providing a non-essential modification of the invention that may not be presently contemplated, may represent an equivalent modification of the invention.
The present invention is not limited to the above embodiments, but is merely preferred embodiments of the present invention, and the present invention should be construed as being limited to the above embodiments as long as the technical effects of the present invention are achieved by the same means. Various modifications and variations are possible in the technical solution and/or in the embodiments within the scope of the invention.
Claims (9)
- An optimization method for the success rate of the OBU to wake up with a portal transaction by mistake is characterized by comprising the following steps:step 110, controlling the OBU to carry out dormancy initialization;step 120, judging whether the OBU is awakened by 5.8G, if not, starting operation according to a preset function, repeating step 120, and if yes, turning to step 130;130, starting a DSRC transaction flow and timing, and obtaining timing duration after finishing DSRC transaction;step 140, judging whether the timing duration exceeds the transaction time threshold, if yes, turning the false wake-up time record value +1 to step 150, if not, judging whether the BST is received, if not, turning the false wake-up time record value +1 to step 150, if the BST is received, resetting the timing duration, the false wake-up time record value and the false wake-up level, then judging whether the received first BST is a BST associated with a door frame, if yes, turning up the receiving sensitivity of the OBU and returning to step 130 for operation, and if not, directly returning to step 130 for operation;step 150, calibrating the wake-up bandwidth, and setting a false wake-up level and a corresponding wake-up sensitivity according to the false wake-up frequency record value;step 160, controlling the OBU to go to sleep with the calibrated wake-up bandwidth, the set false wake-up level and the corresponding wake-up sensitivity.
- 2. The method for optimizing an OBU false wake-up and portal transaction success rate according to claim 1, wherein concretely, sleep initialization refers to initializing a wake-up bandwidth of the OBU, a false wake-up level, a corresponding wake-up sensitivity thereof, and a reception sensitivity of the OBU.
- 3. The method for optimizing a success rate of an OBU wake-up by mistake and a portal transaction of claim 1, wherein the step of increasing the sensitivity of the OBU to receive comprises,the receiving sensitivity of the OBU is adjusted by a first preset step length every time, the adjusted spectrometer reading is obtained, the error rate after each adjustment is used as a judging standard, when the error rate is lower than a preset threshold value, the receiving sensitivity of the corresponding OBU is the final receiving sensitivity and is not adjusted any more, specifically, the following relational expression is satisfied when the OBU interacts with a portal antenna,，wherein, pt: transmitting power, unit W; pr: received power, unit W; gt: transmitting antenna gain, unit dBi; gr: receiving antenna gain, unit dBi; lambda: the wavelength of the center frequency of 5.8GHz is constant and is in mm; d: the distance between the transmitting antenna and the receiving antenna is in m; l: the system loss factors irrelevant to propagation comprise line loss, microstrip line insertion loss and impedance mismatch insertion loss;based on the above relationship, when subjected to a spectrometer test, there is the following relationship,，wherein, PL: path attenuation is calculated based on L; pt0: transmitting cable insertion loss, negative constant; pr0: receiving cable attenuation, negative; pr: the power of the spectrometer, the spectrometer reading,wherein the mast antenna corresponds to the transmitting antenna and the OBU corresponds to the receiving antenna.
- 4. The method for optimizing the success rate of an OBU false wake-up and portal transaction of claim 1, wherein specifically calibrating the wake-up bandwidth and setting the false wake-up level and its corresponding wake-up sensitivity according to the value of the number of false wake-up times record comprises,presetting a reference value of wake-up sensitivity, and setting N gears, namely false wake-up grades, for each gear which is reduced by MdBm by the reference value;judging whether the false wake-up level is greater than 0 level,if the number of the false wake-up times is larger than 0, judging whether the number of the false wake-up times is larger than a first preset number of times, if the number of the false wake-up times is larger than the first preset number of times, judging whether the number of the false wake-up times is largest, if the number of the false wake-up times is not larger than the first preset number of times, the number of the false wake-up times cannot be reduced, calibrating the wake-up bandwidth, namely converging to 14K square wave bandwidth, then enabling the user to sleep, if the number of the false wake-up times is not yet regulated to the largest, increasing the number of the false wake-up times, namely reducing the wake-up sensitivity, and if the number of the false wake-up times is not larger than the first preset number of times, giving an alarm;if the number of the false wake-up times is not more than 0, judging whether the number of the false wake-up times is more than a second preset number of times, if the number of the false wake-up times is not more than the second preset number of times, not adjusting, if the number of the false wake-up times is more than the second preset number of times, judging whether the false wake-up level is maximum, if the number of the false wake-up times is not more than the second preset number of times, the number of the false wake-up levels cannot be reduced, if the number of the false wake-up levels is maximum, the corrected wake-up bandwidth is converged to 14K square wave bandwidth, and if the number of the false wake-up levels is not regulated to the maximum, the false wake-up level is increased, and if the number of the false wake-up levels is not regulated to the maximum, the false wake-up sensitivity is reduced.
- 5. The method for optimizing the success rate of an OBU false wake-up and portal transaction of claim 4, wherein M is 1, n is 6, the first predetermined number of times is 2000, and the second predetermined number of times is 1000.
- 6. The method of optimizing an OBU false wake up and portal transaction success rate as described in claim 4, wherein calibrating the wake up bandwidth to converge to a 14K square wave bandwidth comprises,and (3) carrying out wake-up bandwidth adjustment by using a second preset step length every time, testing by using a preset interference signal source scheme, and obtaining the wake-up bandwidth when the preset interference signal source scheme cannot wake up by mistake, namely, the final wake-up bandwidth is not adjusted any more.
- 7. The optimization method of the success rate of the OBU false wake-up and portal transaction according to claim 6, wherein the actual wake-up bandwidth interval is 13.0 Khz-15.42 Khz.
- An optimization device for the success rate of the transaction of the OBU with the door frame, which is characterized by comprising:the initialization module is used for controlling the OBU to carry out sleep initialization;the wake-up state judging module is used for judging whether the OBU is awakened by 5.8G, if not, starting operation according to a preset function and repeatedly operating the wake-up state judging module, and if yes, turning to the operation transaction timing module;the transaction timing module is used for starting the DSRC transaction flow and timing, and obtaining timing duration after finishing DSRC transaction;the transaction duration judging module is used for judging whether the timing duration exceeds a transaction time threshold, if yes, the error wake-up time record value +1 is transferred to the step 150, if not, whether the BST is received, if not, the error wake-up time record value +1 is transferred to the parameter adjusting module for operation, if the BST is received, the timing duration, the error wake-up time record value and the error wake-up level are reset, then whether the received first BST is the BST related to the portal is judged, if yes, the receiving sensitivity of the OBU is increased and the operation of the transaction timing module is returned, and if not, the operation of the transaction timing module is directly returned;the parameter adjustment module is used for calibrating the wake-up bandwidth and setting the false wake-up level and the corresponding wake-up sensitivity according to the false wake-up frequency record value;and the dormancy module is used for controlling the OBU to enter dormancy according to the calibrated wakeup bandwidth, the set false wakeup level and the corresponding wakeup sensitivity.
- 9. The apparatus for optimizing a success rate of an OBU's false wake-up and portal transaction according to claim 8, wherein concretely, sleep initialization refers to initializing a wake-up bandwidth of the OBU, a false wake-up level, a corresponding wake-up sensitivity thereof, and a reception sensitivity of the OBU.
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