CN105791042B - Communication quality testing method in ETC system - Google Patents
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Abstract
The invention discloses a method for testing communication quality in an ETC system, which aims to solve the problems of complicated and incomplete quality test in the prior art. The test method comprises the steps of receiving a data frame in an agreed format through an OBU/RSU in an ETC system, recording and storing the data frame, counting missed frames in the data frame by the OBU/RSU, calculating a communication success rate according to the missed frames, testing the communication quality of the OBU/RSU in real time, achieving testing under complex field conditions of multiple angles, multiple distances and the like without the aid of external special measuring equipment, providing effective basic data for debugging of receiving and transmitting performances of the OBU and the RSU, assisting in positioning DSRC communication faults and improving DSRC communication quality.
Description
Technical Field
The invention belongs to the technical field of Electronic Toll Collection (ETC) systems, and particularly relates to a communication quality testing method in an ETC system.
Background
Electronic Toll Collection (ETC) systems are related to Manual Toll Collection (MTC) systems. Under the ETC environment, when a vehicle passes through a toll station, vehicle identification and information communication are realized through vehicle-mounted equipment, and corresponding fees are automatically deducted from a pre-bound IC card or a bank card. The ETC system is an automatic electronic toll collection system which is mainly researched and popularized internationally at present and is suitable for vehicle toll collection on expressways and under the environment of bridges and tunnels with busy traffic.
An On-Board Unit (OBU) and a Road Side Unit (RSU) are standard configurations of the ETC system, as shown in fig. 1. The OBU is generally installed on the vehicle, generally installs on the front windshield of vehicle, and the OBU has IC-card interface, can insert the IC-card that has prestored a certain amount of money, also can link to each other with the PC, shows relevant information. The RSU comprises a vehicle detection unit, an information reading and writing unit, an automatic railing, a corresponding control unit and the like. When the vehicle passes through the ETC lane, the RSU detects the vehicle, the OBU communicates with the RSU, when the effective information of the vehicle is read out through the OBU by the RSU information reading and writing unit, the control unit sends a corresponding instruction to the automatic railing, the vehicle is allowed to pass after charging, and the vehicle can finish charging without stopping, so that the passing speed of the vehicle is increased, and the problem of traffic jam is effectively solved.
The ETC system depends on the communication between the OBU and the RSU, and therefore, the communication quality between the OBU and the RSU is very critical to the normal operation of the ETC system, and the communication quality between the OBU and the RSU needs to be tested and adjusted in real time.
As shown in fig. 1, the Communication between the OBU and the RSU is typically Dedicated Short Range Communication (DSRC). At present, there are generally two ways for testing and evaluating communication quality in an ETC system: the first mode is a single performance test under the microwave darkroom environment by means of external test equipment, and as the communication department has clear requirements on the communication quality, the external test is carried out strictly according to the standard test method of the communication department under normal conditions, but not in real time, so that the test is unhooked from the actual use environment; the second mode is that the effect of transaction is used as the evaluation basis through the actual use of the RSU and the OBU, and because the communication quality in the actual use environment affects the actual operation effect of the ETC system, the effect of the DSRC communication quality of the ETC system in the passage environment is generally adopted for evaluation, so that the evaluation is not comprehensive enough.
Disclosure of Invention
The embodiment of the invention provides a communication quality testing method and a system in an ETC system, which are used for testing the DSRC communication quality in the ETC system in real time.
According to an aspect of the present invention, there is provided a communication quality testing method in an ETC system including at least an on-board device unit OBU, the method including:
the OBU receives a data frame in an agreed format, and records and stores the data frame;
and the OBU counts the missing frames in the data frames and calculates the communication success rate according to the missing frames.
In the above scheme, the ETC system further includes a road side unit RSU, and the RSU transmits the data frame in the agreed format.
In the above scheme, the RSU transmits the data frame of the agreed format in a cyclic manner at fixed intervals.
In the scheme, the OBU sends the data frame to an upper computer in a wireless or wired mode; and the upper computer performs statistics and analysis on the received data frames and evaluates the communication performance of the OBU.
According to another aspect of the present invention, there is also provided a communication quality testing method in an ETC system including at least a roadside unit RSU, the method including:
the RSU receives a data frame in an agreed format, and records and stores the data frame;
and the RSU counts the missed frames in the data frames and calculates the communication success rate according to the missed frames.
In the above scheme, the ETC system further includes an on-board unit (OBU), and the OBU transmits the data frame in the agreed format.
In the above scheme, the OBU transmits the data frame in the agreed format in a cyclic manner at fixed intervals.
In the scheme, the RSU sends the data frame to an upper computer in a wireless or wired mode; and the upper computer performs statistics and analysis on the received data frames and evaluates the communication performance of the RSU.
According to still another aspect of the present invention, there is also provided a communication quality testing method in an ETC system including at least an on-board unit (OBU) and a roadside unit (RSU), the method including:
the OBU transmits a data frame in a first agreed format to the RSU, and the RSU transmits a data frame in a second agreed format to the OBU;
the OBU receives the second appointed format data frame transmitted by the RSU, and records and stores the data frame; the RSU receives the data frame in the first agreed format transmitted by the OBU, and records and stores the data frame;
the OBU counts the missed frames in the received data frames, and calculates a second communication success rate according to the missed frames; and the RSU counts the missed frames in the received data frames and calculates a first communication success rate according to the missed frames.
In the above scheme, the OBU transmits the data frame of the agreed format to the RSU, and transmits the data frame in a cyclic manner at fixed intervals; and the RSU transmits the data frame with the agreed format to the OBU, and the data frame is transmitted in a fixed interval circulating mode.
According to the technical scheme provided by the embodiment of the invention, the OBU/RSU in the ETC system receives the data frames in the appointed format, records and stores the data frames, then the OBU/RSU counts the frames which are missed to be received in the data frames, and calculates the communication success rate according to the frames which are missed to be received, so that the communication quality of the OBU/RSU is tested in real time, the test under the complex field conditions of multiple angles, multiple distances and the like is realized without other external special measuring equipment, effective basic data are provided for the debugging of the receiving and transmitting performances of the OBU and the RSU equipment, the positioning of DSRC communication faults is assisted, and the DSRC communication quality is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art ETC system architecture;
fig. 2 is a flow chart of a communication quality testing method according to a first embodiment of the present invention;
FIG. 3 is a block diagram of a test method according to a preferred embodiment of the first embodiment of the present invention;
fig. 4 is a flow chart illustrating a communication quality testing method according to a second embodiment of the present invention;
FIG. 5 is a block diagram of a test method according to a preferred embodiment of the second embodiment of the present invention;
fig. 6 is a flow chart illustrating a communication quality testing method according to a third embodiment of the present invention;
fig. 7 is a flow chart of a testing method according to a preferred embodiment of the third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The communication quality testing method of the ETC system provided by the embodiment of the invention uses the equipment of the ETC system, namely the On-Board Unit (OBU) and the Road Side Unit (RSU) of the ETC system shown in figure 1 to test the communication quality between the RSU and the OBU, wherein in the testing process, the RSU and the OBU can be tested independently or simultaneously. The present invention will be described in detail below with reference to the following detailed description and accompanying drawings.
Fig. 2 is a flowchart illustrating a communication quality testing method according to a first embodiment of the present invention.
As shown in fig. 2, the flow of the ETC system communication quality testing method of the present embodiment includes the following steps:
and step S11, the OBU receives the data frame in the agreed format and records and stores the data frame.
In this step, the data frame with the agreed format is usually transmitted by a communication peer of the OBU in the ETC system, i.e., the RSU. The data frame with the agreed format is the agreed format for the communication quality test, and may be a data frame which is commonly used by the ETC system and conforms to the national standard, such as a continuous frame conforming to the physical layer protocol of the ETC system. The agreed format may comprise a frame number or be arranged according to a certain rule, wherein the rule can be agreed by the two communication parties before communication. The format generally uses a principle that a communication success rate is determined according to a specific number of received frames in a short time, and is usually a continuous frame with a fixed format, for example, a continuous frame format that is defined to conform to a physical layer protocol of the ETC system. The interval of the fixed format continuous frame transmitted by the opposite communication terminal can be adjusted and determined according to the hardware condition of the receiving party, and can also be transmitted circularly according to the fixed interval.
And step S12, the OBU counts the missing frames in the data frames and calculates the communication success rate according to the missing frames.
In this step, the calculated communication success rate can be displayed through a human-computer interface of the OBU, so that a tester can conveniently master test data at any time and adjust angles, distances and the like, and communication quality conditions of all the distances and angles are obtained without performing complicated equipment change. The stored test data in a certain time period can be sent to the upper computer in a wired or wireless mode, and the upper computer performs data statistics and analysis, so that the overall communication performance of the OBU is evaluated.
Fig. 3 is a flow chart of a test method according to a preferred embodiment of the first embodiment of the present invention.
As shown in fig. 3, the ETC system communication quality testing method of the present preferred embodiment includes the following steps:
in step S101, the RSU in the ETC system transmits a fixed format continuous frame. In this step, the fixed format continuous frames are promised in advance by the RSU and the OBU, and are continuous frames containing frame sequence numbers. Here, the RSU performing the continuous frame transmission may be an RSU in a normal use state, or an RSU used to test the ETC. That is, the test method of the present embodiment is suitable for performance evaluation before the ETC system is put into operation, and also suitable for real-time performance evaluation after the ETC system is put into operation.
And step S102, the OBU receives the fixed format continuous frame transmitted by the RSU, and records and stores the frame.
And step S103, the OBU counts the missing frames in the continuous frames, calculates the communication success rate according to the missing frames, displays the communication success rate, records the communication condition, feeds the communication condition back to the RSU, and shifts to step S101 and starts step S104.
And step S104, the OBU sends the data in a certain appointed time period to the upper computer in a wireless mode, and the upper computer performs statistics and analysis on the received data in the time period and evaluates the overall communication performance of the OBU.
The statistics and analysis comprises integrity analysis and accuracy analysis of the head, tail and body of the data frame, and statistics of all test indexes of all data frames received in a specified time period, so as to evaluate the communication performance of the OBU. This step may also include: and displaying the evaluation result of the OBU communication performance.
It can be seen from the technical solutions of the above embodiments that the technical solution can test the communication quality of the OBU in real time, and realize the test under complex field conditions of multiple angles, multiple distances, and the like without using other external special measuring devices, and provide effective basic data for debugging of the reception and emission performance of the OBU device, and assist in locating DSRC communication faults and improving DSRC communication quality.
Fig. 4 is a flowchart illustrating a communication quality testing method according to a second embodiment of the present invention.
As shown in fig. 4, the flow of the ETC system communication quality testing method of the present embodiment includes the following steps:
in step S21, the RSU receives the data frame in the agreed format, and records and stores the data frame.
In this step, the data frame with the agreed format is usually transmitted by a communication peer of the RSU in the ETC system, i.e., the OBU. The data frame with the agreed format is the agreed format for the communication quality test, conforms to the national standard, and can comprise a frame sequence number or be arranged according to a certain rule, wherein the rule can be agreed by the two communication parties before communication. The format generally uses a principle that a communication success rate is determined according to a specific number of received frames in a short time, and is usually a continuous frame with a fixed format, for example, a continuous frame format that is defined to conform to a physical layer protocol of the ETC system. The interval of the fixed format continuous frame transmitted by the opposite communication terminal can be adjusted and determined according to the hardware condition of the receiving party, and can also be transmitted circularly according to the fixed interval.
And step S22, the RSU counts the missing frames in the data frames and calculates the communication success rate according to the missing frames.
In this step, the calculated communication success rate may be displayed through a human-computer interface of the RSU itself, so that a tester can conveniently grasp test data at any time and adjust angles, distances, and the like, thereby obtaining communication quality conditions of each distance and angle without performing complicated equipment changes. The stored test data in a certain time period can be sent to an upper computer in a wired or wireless mode, and the upper computer performs data statistics and analysis, so that the overall communication performance of the RSU is evaluated.
Fig. 5 is a flow chart of a test method according to a preferred embodiment of the second embodiment of the present invention.
As shown in fig. 5, the ETC system communication quality testing method of the present preferred embodiment includes the following steps:
in step S201, the OBU in the ETC system transmits a fixed format continuous frame. In this step, the fixed format continuous frames are promised in advance by the RSU and the OBU, and are continuous frames arranged according to a certain rule. Here, the RSU performing the continuous frame transmission may be an RSU in a normal use state, or an RSU used to test the ETC. That is, the test method of the present embodiment is suitable for performance evaluation before the ETC system is put into operation, and also suitable for real-time performance evaluation after the ETC system is put into operation.
And step S202, the RSU receives the fixed format continuous frame transmitted by the OBU, and records and stores the frame.
Step S203, the RSU counts the missing frames in the continuous frames, calculates the communication success rate according to the missing frames, displays the communication success rate, records the communication condition, feeds the communication condition back to the OBU, and shifts to step S201 and starts step S204.
And step S204, the RSU sends the data in a certain appointed time period to an upper computer in a wired mode, and the upper computer performs statistics and analysis on the data in the received time period and evaluates the overall communication performance of the RSU.
The statistics and analysis comprises integrity analysis and accuracy analysis of the head, tail and body of the data frame, and statistics of all test indexes of all data frames received in a specified time period, so as to evaluate the communication performance of the RSU. This step may also include: and displaying the evaluation result of the RSU communication performance.
It can be seen from the technical solutions of the above embodiments that the technical solution can test the communication quality of the RSU in real time, realize the tests under complex field conditions of multiple angles, multiple distances, and the like without using external special measuring devices, provide effective basic data for debugging of the receiving and transmitting performance of the RSU device, and assist in locating DSRC communication faults and improving DSRC communication quality.
Fig. 6 is a flowchart illustrating a communication quality testing method according to a third embodiment of the present invention.
As shown in fig. 6, the flow of the ETC system communication quality testing method of the present embodiment includes the following steps:
step S31, the OBU transmits the data frame of the first agreed format to the RSU, and the RSU transmits the data frame of the second agreed format to the OBU. In this step, the data frame of the first agreed format and the data frame of the second agreed format may be the same or different. The data frames in the first agreed format and the data frames in the second agreed format both can conform to the data frames which are commonly used by the ETC system and conform to the national standard, such as continuous frames conforming to the physical layer protocol of the ETC system. The agreed format may comprise a frame number or be arranged according to a certain rule, wherein the rule can be agreed by the two communication parties before communication. The format generally uses a principle that a communication success rate is determined according to a specific number of received frames in a short time, and is usually a continuous frame with a fixed format, for example, a continuous frame format that is defined to conform to a physical layer protocol of the ETC system. The interval of the fixed format continuous frame transmitted by the opposite communication terminal can be adjusted and determined according to the hardware condition of the receiving party, and can also be transmitted circularly according to the fixed interval.
Step S32, the OBU receives the second agreed format data frame transmitted by the RSU, and records and stores the data frame; the RSU receives the data frame in the first agreed format transmitted by the OBU, and records and stores the data frame;
step S33, the OBU counts the missing frames in the received data frames and calculates a second communication success rate according to the missing frames; and the RSU counts the missed frames in the received data frames and calculates a first communication success rate according to the missed frames.
Fig. 7 is a flow chart of a testing method according to a preferred embodiment of the third embodiment of the present invention.
As shown in fig. 7, the ETC system communication quality testing method of the present preferred embodiment includes the following steps:
and step S301, the RSU and the OBU transmit a start frame. The initial frame in this step is agreed by the RSU and the OBU in advance, and is a continuous frame with a certain arrangement order.
Step S302, after the OBU and the RSU of the respective communication opposite ends of the RSU and the OBU receive the data frame, transmitting response data of the received data to the respective opposite ends.
And step S303, the OBU and the RSU calculate the communication success rate according to the received data, record the communication condition, and shift to step S301, and start step S304.
And S304, the OBU and the RSU send data in a certain appointed time period to the upper computer in a wired mode, and the upper computer performs statistics and analysis on the received data in the time period and evaluates the overall communication performance of the OBU and the RSU.
The statistics and analysis comprises integrity analysis and accuracy analysis of the head, tail and body of the data frame, and statistics of all test indexes of all data frames received in a specified time period, so as to evaluate the communication performance of the OBU and the RSU. This step may also include: and displaying the evaluation result of the OBU and the RSU communication performance. It can be seen from the technical solutions of the above embodiments that the technical solution can test the communication quality of the RSU and the OBU in real time, and realize the test under complex field conditions of multiple angles, multiple distances, and the like without using external special measuring devices, provide effective basic data for debugging of receiving and transmitting performance of the RSU and the devices, and assist in locating DSRC communication faults and improving DSRC communication quality.
It should be noted that, those skilled in the art can understand that all or part of the steps and modules for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing related hardware, such as a programmable logic controller PLC, a central controller CPU, and the like; the program may be stored in a computer readable storage medium, which may include memory, magnetic or optical disks, etc., such as a CD-ROM or CD-RAM.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (6)
1. A communication quality testing method in an ETC system including at least an on-board unit (OBU), the method comprising:
the RSU transmits a data frame with an agreed format in a fixed interval circulating mode;
the OBU receives a data frame in an agreed format, and records and stores the data frame;
and the OBU counts the missing frames in the data frames and calculates the communication success rate according to the missing frames.
2. The communication quality testing method according to claim 1, wherein the OBU sends the data frame to an upper computer in a wireless or wired manner; and the upper computer performs statistics and analysis on the received data frames and evaluates the communication performance of the OBU.
3. A communication quality testing method in an ETC system, wherein the ETC system at least comprises a Road Side Unit (RSU), and the method comprises the following steps:
the OBU transmits data frames in an agreed format in a fixed interval circulating mode;
the RSU receives a data frame in an agreed format, and records and stores the data frame;
and the RSU counts the missed frames in the data frames and calculates the communication success rate according to the missed frames.
4. The communication quality testing method according to claim 3, wherein the RSU sends the data frame to an upper computer in a wireless or wired manner; and the upper computer performs statistics and analysis on the received data frames and evaluates the communication performance of the RSU.
5. A communication quality testing method in an ETC system, wherein the ETC system at least comprises an on-board unit (OBU) and a Road Side Unit (RSU), and the method comprises the following steps:
the OBU transmits a data frame in a first agreed format to the RSU, and the RSU transmits a data frame in a second agreed format to the OBU;
the OBU receives the second appointed format data frame transmitted by the RSU, and records and stores the data frame; the RSU receives the data frame in the first agreed format transmitted by the OBU, and records and stores the data frame;
the OBU counts the missed frames in the received data frames, and calculates a second communication success rate according to the missed frames; and the RSU counts the missed frames in the received data frames and calculates a first communication success rate according to the missed frames.
6. The communication quality testing method of claim 5, wherein the OBU transmits the data frames of the agreed format to the RSU in a cyclic manner at fixed intervals; and the RSU transmits the data frame with the agreed format to the OBU, and the data frame is transmitted in a fixed interval circulating mode.
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| CN106851714B (en) * | 2017-01-05 | 2020-05-12 | 中国铁道科学研究院集团有限公司通信信号研究所 | Vehicle-ground wireless communication quality evaluation method based on self-learning mode |
| CN110225534B (en) * | 2019-05-29 | 2022-07-19 | 北京聚利科技有限公司 | Road side unit testing method, device, equipment, system and readable storage medium |
| CN111246421B (en) * | 2019-12-31 | 2023-03-31 | 航天信息股份有限公司 | Method, device, storage medium and electronic equipment for transmitting data |
| CN114826884B (en) * | 2022-05-30 | 2023-08-18 | 苏州浪潮智能科技有限公司 | Method, device, equipment and readable medium for positioning communication faults of cross-equipment protocol |
| CN115357067B (en) * | 2022-08-26 | 2024-05-03 | 上海磐启微电子有限公司 | Full-automatic batch test system for high-low temperature performance of wireless image transmission product |
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