WO2012068973A1

WO2012068973A1 - Method and apparatus for electronic toll collection system road side unit signal downlink

Info

Publication number: WO2012068973A1
Application number: PCT/CN2011/082491
Authority: WO
Inventors: 林树亮; 徐根华; 李兴锐
Original assignee: 深圳市金溢科技有限公司
Priority date: 2010-11-24
Filing date: 2011-11-18
Publication date: 2012-05-31
Also published as: MY162824A

Abstract

Disclosed are a method and apparatus for electronic toll collection system road side unit signal downlink, comprising a searching device and a jamming device. When the electronic toll collection system road side unit (a, b, c) is not transacting with an on board unit (4, 5), if a synchronized transaction command is received, then a transaction signal is synchronously sent to the same driveway (A, B, C); when transacting with the on board unit on the same driveway, if a synchronized transaction command is received, the jamming device synchronously sends jamming signals to the same driveway (A, B, C) so that other on board units (4, 5) entering the same driveway cannot resolve the transaction signal synchronously sent by the road side unit (a, b, c). The present invention avoids the transaction of any other on board unit entering the same driveway transacting with the road side unit when the road side unit transacts with an on board unit on the same driveway.

Description

Signal downlink method and device for electronic non-stop toll road side unit

The present invention relates to a signal down method for an electronic toll roadside unit and a functional module framework for realizing the method mainly by a computer program.

Background technique

The electronic non-stop toll booth has multiple lanes, and one or more roadside units are provided for each lane.

(RSU) The vehicle unit (0BU) is located in the car. When the car enters one of the lanes, the onboard unit generally receives the transaction signal sent by the roadside unit of the vehicle, and is awakened by the transaction signal to be traded. If the roadside unit of the vehicle does not send a transaction signal when the vehicle enters the lane and the bypass side unit just sends a transaction signal, the vehicle unit may erroneously trade with the bypass side unit, causing repeated deduction, mis-delivery, false alarm And so on.

To this end, the patent document with the bulletin number CN201508576U gives a technical solution using a synchronous signal generator (referred to as a synchronizer), the synchronizer issues a synchronous transaction command to the roadside unit, so that each roadside unit synchronizes to its lane. Send a trading signal. Because the trading signal sent by the roadside unit with a relatively close distance is significantly stronger than the trading signal sent by the bypass side unit with a long distance, the vehicle unit entering the lane will trade with the roadside unit without mistakenly Bypass side unit trading.

The problem with the technical solution of the synchronizer in practical application is that when a roadside unit is trading with the onboard unit of the own lane, if other onboard units also enter the own lane at this time, because the roadside unit is in the transaction Therefore, even if the synchronizer issues a synchronous transaction command at this time, the roadside unit will not send the transaction signal to establish another transaction, so the other onboard units that are entered later are likely to be wrong because they receive the transaction signal of the bypass side unit. Trading with other roadside units.

Summary of the invention

The technical problem to be solved by the present invention is: How to avoid the transaction of other onboard units entering the own lane and the bypass side unit when the roadside unit is trading with the onboard unit of the own lane.

The signal down method of the electronic non-stop toll roadside unit, when the electronic non-stop toll roadside unit does not trade with the onboard unit, if it receives the synchronous transaction command, it synchronously transmits to the own lane The transaction signal, when the transaction is carried out with the onboard unit of the lane, if the synchronous transaction command is received, the disturbance signal is synchronously sent to the own lane, so that the other onboard units entering the lane at this time cannot resolve the bypass side unit. The transaction signal sent synchronously. When the roadside unit makes a transaction with the onboard unit of the own lane, if a synchronous transaction command is received, it does not ignore it, but synchronously transmits a disturbance signal to the own lane. Because in this lane, the disturbance signal sent by the nearby roadside unit is significantly stronger than the transaction signal sent by the bypass side unit that is far away, so the other vehicle units that enter the lane at this time are not connected to the road side. Unit trading, but under the counteracting effect of the scrambled signal, the transaction signal sent synchronously by the bypass side unit is not resolved, and the transaction is not performed with the bypass side unit. According to the different coding of the transaction signal, different interference modes are adopted. When the transaction signal coding between the roadside unit and the onboard unit adopts the first code FM0 coding, the disturbance signal is the continuous data of the first code FM0 coded “0”; The length of the signal is 32 μ s~200 μ S o. When the transaction signal between the roadside unit and the onboard unit is encoded, the second coded Manchester code is used, and the scrambled signal is the first code FM0 encoded continuous data "0" or " 1 "; At this time, the length of the disturbance signal is 120 μ s~400 s. Preferably, the time at which the scrambling signal is transmitted is when the frame header or frame information or the end of the frame of the bypass side unit transaction signal is transmitted.

The method presented, in which all or part of the steps can be accomplished by establishing a functional module framework, is controlled by computer program instructions to control the computer system. These computer program instructions are stored in a computer readable storage medium. Means written in a manner that is fully consistent with the steps of the method described, the components of the device are to be understood as functional modules that must be established to implement the steps of the method, devices defined by such a set of functional modules It should be understood that the functional module architecture of the corresponding method is mainly implemented by a computer program, and should not be understood as a physical device that implements the method mainly by hardware.

Another object of the present invention is to provide a signal down-going device for an electronic toll-free toll roadside unit, comprising search means for synchronously transmitting a synchronous transaction command when a transaction with an on-board unit is not being performed The lane sends a transaction signal, which is characterized in that: further comprising: a scrambling device, configured to send a scrambling signal to the lane synchronously if the synchronous transaction command is received when the transaction is performed with the onboard unit of the lane, so as to enter The other onboard units of the lane cannot resolve the transaction signals sent synchronously by the bypass side unit. Preferably, the first encoding FM0 encoding device is further configured to: when the transaction signal encoding between the roadside unit and the onboard unit is encoded by the first encoding FM0, the scrambling signal sent by the scrambling device is a continuous encoding of the first encoding FM0. Data "0"; or preferably, the second coded Manchester code encoding device is used instead of the first coded FM0 encoding device, and the transaction signal coding between the roadside unit and the onboard unit adopts the second coded Manchester code, and the scrambling signal is first Encodes the continuous data "0" or "1" encoded by FM0. Preferably, the time at which the scrambling device transmits the scrambled signal is when the frame header or frame information or the end of the frame of the bypass side unit transaction signal is transmitted.

Preferably, when the first coded FM0 encoding device is selected, the time length of the scrambled signal selected by the scrambling device is 32 μs~200 μs; when the second encoded Manchester code encoding device is selected, the time length of the disturbing signal is 120 s~400 s. The present invention has an advantageous effect of effectively solving the problem that when the roadside unit performs a transaction with the onboard unit of the own lane, the other onboard unit and the bypass side unit are prevented from entering the own lane.

DRAWINGS

FIG. 1 is a schematic diagram of communication status between an electronic toll collection station and an onboard unit.

Fig. 2 is a view showing an example of the encoded data waveform of the first coded FM0 code of the first embodiment.

Fig. 3 is a timing chart showing the synchronous transmission of the transaction signal by the way side unit of the embodiment 1.

Figure 4 is a timing diagram of the first side unit b of the embodiment 1 disturbing the header of the bypass side unit transaction signal. Fig. 5 is a timing chart showing the information of the bypass side unit transaction signal frame of the first side unit b of the embodiment 1. Figure 6 is a timing diagram of the first side unit b of the embodiment 1 disturbing the end of the bypass side unit transaction signal. Figure 7 is a diagram showing an example of the encoded data waveform of the second coded Manchester code of the second embodiment.

Fig. 8 is a timing chart showing the synchronous transmission of the transaction signal by the way side unit of the embodiment 2.

Figure 9 is a timing diagram of the second side unit b of the embodiment 2 disturbing the header of the bypass side unit transaction signal. Fig. 10 is a timing chart showing the information of the bypass side unit transaction signal frame of the second side unit b of the embodiment 2. Figure 11 is a timing diagram of the second side unit b of the embodiment 2 disturbing the end of the bypass side unit transaction signal. detailed description

The present invention will be further described below in conjunction with the accompanying drawings: Example 1

The electronic non-stop toll booth is shown in Figure 1. There are three lanes in the same direction, B and C. One roadside unit is set for each lane. The transaction signal coding between the roadside unit and the vehicle unit uses the first code FM0 code (first An example of the encoded data waveform encoded by the FM0 code is shown in FIG. 2). The first encoded FM0 encoded signal is sequentially arranged as a wake-up signal, a preamble, a frame header, a frame information, and a frame tail. The wake-up signal is used to wake up the on-board unit, and the preamble is provided. The onboard unit performs signal synchronization, and the frame header and the frame tail are used to allow the onboard unit to discriminate the position of the frame information in the timing. Suppose there is a car entering lane B (with onboard unit 4), and lanes A and C are not entering. The synchronizer 3 sends a synchronous transaction command to the roadside units a, b, c, so that each roadside unit synchronously transmits a transaction signal to its lane, as shown in Fig. 3. For lane B, since it is closest to the roadside unit b, the transaction signal strength of the roadside units a, c is significantly weaker than the transaction signal sent by the roadside unit b. Therefore, the onboard unit 4 which is the first to enter the lane B will be dealt with the roadside unit b without being dealt with the roadside units a, c.

When the roadside unit b is being traded with the onboard unit 4, another vehicle (with the onboard unit 5 thereon) also enters the lane B, at which time the lane, C has not yet entered the vehicle. The synchronizer 3 transmits a synchronous transaction command to the roadside units a, b, c, and the roadside unit, c synchronously transmits a transaction signal to the lane in which it is located, and the roadside unit b synchronizes because it is currently trading with the onboard unit 4. A disturbance signal is sent to the lane B. Under the first coded FM0 coding rule, the frame header of the transaction signal transmitted by the roadside units a, c is "01111110" for a duration of 32 s. The roadside unit b preferably transmits the scrambling signal when the roadside units a, c transmit the frame header of the transaction signal. As shown in FIG. 4, the advantage is that the onboard unit 5 resolves the transaction signals transmitted by the roadside units a, c. The frame header, the onboard unit 5 will not receive the subsequent frame information and the end of the frame. Since the data of the first code FM0 coded "0" level flip frequency is higher than the data "1" (see Fig. 2), it is easier to be identified, so the scramble signal preferably uses the first code FM0 encoded continuous data "0"", to achieve better disruption. If the disturbance signal lasts for a shorter time than the frame header, the disturbance effect will be less than ideal; if the disturbance signal lasts too long, it will affect the ongoing transaction between the roadside unit b and the vehicle unit 4, and comprehensively consider that the disturbance signal is the most Choose a moderate length of time. Considering that the first coded FM0 code frame header has a time length of 32 μs, the scrambling signal in this example is preferably 120 μs in length (for the first code FM0 coded frame header, disturbing) The signal length is 32 s to 200 s, which is moderate). Non-preferredly, the time at which the scrambling signal is transmitted may also be when the frame information of the bypass side unit transaction signal is transmitted (as in FIG. 5) or the end of the frame is transmitted (FIG. 6). Example 2

Similarly, the electronic non-stop toll booth is as shown in Fig. 1, and there are three lanes in the same direction, B and C, and one roadside unit is arranged for each lane. In this embodiment, the signal coding between the roadside unit and the onboard unit adopts the second. Encoding the Manchester code (an example of the encoded data waveform of the second coded Manchester code is shown in FIG. 7), and the second coded Manchester code signal is sequentially arranged as a preamble, a frame header, a frame information, and a frame tail, and the preamble is used to wake up the onboard unit and For the vehicle unit to perform signal synchronization, the frame header and the frame tail are used to allow the onboard unit to discriminate the position of the frame information in the timing. Suppose there is a car that enters lane B (there is an onboard unit 4), and lanes A and C do not have a car. The synchronizer 3 sends a synchronous transaction command to the roadside units a, b, c, so that each roadside unit synchronously transmits a transaction signal to its lane, as shown in Fig. 8. For lane B, since it is closest to the roadside unit b, the transaction signal strength of the roadside units a, c is significantly weaker than the transaction signal sent by the roadside unit b. Therefore, the onboard unit 4 which is the first to enter the lane B will be dealt with the roadside unit b without being dealt with the roadside units a, c.

When the roadside unit b is being traded with the onboard unit 4, another vehicle (with the onboard unit 5 thereon) also enters lane B, at which time no lane has entered the lane and C. The synchronizer 3 transmits a synchronous transaction command to the roadside units a, b, c, and the roadside unit, c synchronously transmits a transaction signal to the lane in which it is located, and the roadside unit b synchronizes because it is currently trading with the onboard unit 4. A disturbance signal is sent to the lane B. Under the second coded Manchester coding rule, the transaction time of the transaction signal transmitted by the roadside units a, c is 120 S. The roadside unit b preferably transmits the scrambling signal when the roadside units a, c transmit the frame header of the transaction signal. As shown in FIG. 9, the advantage is that the vehicle unit 5 can resolve the transaction signals transmitted by the roadside unit &, c. The frame header, the onboard unit 5 will not receive the subsequent frame information and the end of the frame. If the disturbance signal lasts for a shorter time than the frame header, the disturbance effect will be less than ideal; if the disturbance signal lasts too long, it will affect the ongoing transaction between the roadside unit b and the vehicle unit 4, and comprehensively consider that the disturbance signal is the most Choose a moderate length of time. Considering that the second coded Manchester frame header has a length of 120 μs, the scrambling signal in this example is preferably 300 μ s in length (for the frame header of the second coded Manchester code, the scrambled signal The length of time is 120 μ 3~400 μ S is moderate).

In general, if the transaction signal coding between the roadside unit and the onboard unit adopts the second coded Manchester code, the second coded Manchester code is also used as the scrambling signal, but in this case, the scrambled signal is the first code. The continuous data "0" or "1" encoded by FM0, that is, the scrambled signal uses a different code than the transaction signal. Comparing the encoded data of the first coded FM0 code (as shown in FIG. 2) and the coded data of the second coded Manchester code (as shown in FIG. 7), the first coded FM0 coded data is "0" or "1". The flat flip frequency is much higher than the second coded Manchester code and is easily recognized, achieving a better disturbance effect. Further, since the data "0" level flip frequency of the first code FM0 code is higher than the data "1" (see FIG. 2), it is easier to be recognized, so the scramble signal is more preferably data "0", reaching Good disturbance effect.

Non-preferredly, the time at which the scrambled signal is transmitted may also be when the frame information of the bypass side unit transaction signal is transmitted (as in Fig. 10) or when the end of the frame is transmitted (Fig. 11).

For the same reason, the above method is also applicable to the opposite lane. The method presented herein, in which all or part of the steps can be accomplished by establishing a functional module framework, is controlled by computer program instructions to control the computer system. These computer program instructions are stored in a computer readable storage medium.

Variations and modifications of the above-described embodiments may also be made by those skilled in the art in light of the above disclosure. Therefore, the present invention is not limited to the specific embodiments disclosed and described, and the modifications and variations of the invention are intended to fall within the scope of the appended claims. In addition, although some specific terms are used in the specification, these terms are merely for convenience of description and do not impose any limitation on the present invention.

Claims

Claim

1. The signal down method of the electronic non-stop toll roadside unit, when the electronic non-stop toll roadside unit does not trade with the onboard unit, if a synchronous transaction command is received, the transaction signal is synchronously transmitted to the own lane, which is characterized in that : When trading with the onboard unit of the own lane, if a synchronous transaction command is received, the disturbance signal is synchronously transmitted to the own lane, so that the other onboard units that enter the lane at this time cannot be parsed by the bypass side unit. Trading signal.

2. The signal down method according to claim 1, wherein: the transaction signal coding between the roadside unit and the onboard unit is encoded by a first coded FM0, and the scrambled signal is a continuous coded data "0" encoded by the first coded FM0.

3. The signal downlink method according to claim 1, wherein the transaction signal coding between the roadside unit and the onboard unit adopts a second coded Manchester code, and the scrambled signal is a continuous coded data "0" encoded by the first code FM0 or " 1 ".

4. The signal down method according to claim 2 or 3, characterized in that: the time at which the scrambled signal is transmitted is when the frame header or frame information or the end of the frame of the bypass side unit transaction signal is transmitted.

5. The signal down method according to claim 2, wherein: the time length of the scrambled signal is 32 μs to 200 s.

6. The signal down method according to claim 3, wherein: the time length of the scrambled signal is 120 μs to 400 s.

7. The signal downlink device of the electronic non-stop toll roadside unit, comprising a search device, for transmitting a transaction signal to the own lane synchronously if a synchronous transaction command is received when the transaction is not performed with the onboard unit, characterized in that : further comprising a scrambling device, configured to send a scrambling signal to the own lane synchronously when receiving the synchronous transaction command when the transaction is performed with the onboard unit of the lane, so that the other onboard units entering the lane at this time do not resolve The transaction signal sent synchronously by the bypass side unit.

8. The signal downlink device according to claim 7, further comprising: a first coded FM0 coding device, configured to encode the transaction signal between the roadside unit and the onboard unit by using the first code FM0 code, and to disturb The scrambling signal transmitted by the device is the continuous data "0" encoded by the first code FM0.

9. The signal downlink device according to claim 7, further comprising: a second coded Manchester code encoding device, wherein the transaction signal code between the roadside unit and the onboard unit is encoded by the second code Manchester The special code, the scrambled signal is the continuous data "0" or "1" encoded by the first coded FMO.

10. The signal downlink device according to claim 7, wherein: the time at which the scrambling device transmits the scramble signal is when the frame header or frame information or the frame end of the bypass side unit transaction signal is transmitted.

11. The signal downlink device according to claim 8, wherein: the disturbance signal transmitted by the disturbance device has a time length of 32 μ 3 to 200 μ S.

12. The signal down device according to claim 9, wherein: the time length of the scramble signal is 120 s to 400 s.