WO2011023143A1

WO2011023143A1 - Method, system and device for obtaining traffic information

Info

Publication number: WO2011023143A1
Application number: PCT/CN2010/076496
Authority: WO
Inventors: 喻丹; 徐雷鸣; 邱巍
Original assignee: 西门子公司
Priority date: 2009-08-31
Filing date: 2010-08-31
Publication date: 2011-03-03
Also published as: CN101996486A

Abstract

The invention provides a method, system and device for obtaining traffic information. A mobile storage access device reads time information and location information from a mobile storage device carried in a vehicle, and writes the current time information and the location information of the mobile storage access device to the mobile storage device. The mobile storage access device provides the time information read out, the location information read out, the current time information and the location information of the mobile storage access device. The present invention does not adopt the method of reading the unique identifier of a vehicle, and ignores the trace of a special vehicle. Because the statistical processing of traffic information is separated from the specific vehicle identifier, the privacy of the vehicle user is protected during the statistical processing of traffic information, and thereby it is more advantageous for the statistical processing of traffic information to be accepted by the vehicle user

Description

Method, system and device for acquiring traffic information

The present invention relates to the field of information acquisition technology, and in particular, to a method, system and device for acquiring traffic information. Background technique

In order to collect traffic statistics for traffic flow, the most common way is to identify each vehicle and track its traffic behavior, and infer large-scale traffic information from the traffic behavior of each vehicle.

One of the commonly used methods is to extract the unique identification of each vehicle in the transportation system, such as the license plate, to facilitate tracking of the vehicle. This way, there is no need to install additional hardware devices on the vehicle, but it will be subject to light quality and air quality. Conditional constraints; in addition, character recognition techniques can also be used, for example, infrared devices are used for optical character recognition, but this approach requires complex algorithms, and existing embedded systems are not sufficient to meet the needs of the algorithm.

Another way is to use RFID (Radio Frequency Identification) technology to identify each vehicle. The system of this type is shown in Fig. 1. It mainly includes: an RFID tag installed on each vehicle, a traffic control node (TN) including a reader (Reader), and traffic management for centralized control of each TN. Center (TMC). Among them, the RFID tag uniquely identifies a vehicle, and the TN is placed on the side of the road or on the road support. The TN uses the Reader to read the RFID tags on each passing vehicle, thereby tracking the traffic behavior of each vehicle. For example, the Reader installed in the A reads the RFID tag of a certain vehicle at time t1 to acquire the identification (ID) of the vehicle, and the Reader installed in the B reads the RFID tag of the vehicle at time t2 to acquire the ID of the vehicle, TN The time difference of the vehicle from A to B can be obtained, thereby obtaining the speed of the vehicle. The TN reports the vehicle ID and the read time read from the RFID tag to the TMC, or reports the time difference from A to B calculated using the information read from the RFID tag to the TMC. The TMC stores the received information in the database according to the vehicle ID, and uses the information in the database to perform traffic information statistics.

However, there is a problem with the above two methods of the prior art: The above methods are all based on the unique identification of the vehicle, which will leak the privacy of the vehicle user. Some users or communities The group does not allow or hope that the traffic statistics system will leak its privacy. For example, it does not want to leak to A and B at a certain time today. However, the identification of vehicles in the prior art is with the license plate. Or the unique identity of the vehicle clearly does not protect the privacy of the vehicle user. Summary of the invention

In view of this, the present invention provides a method, system and apparatus for acquiring traffic information to protect the privacy of a vehicle user during the acquisition of traffic information.

A method of obtaining traffic information, the method comprising:

The mobile storage access device reads time information and location information from the mobile storage device carried by the vehicle, and writes current time information and location information of the mobile storage access device into the mobile storage device; providing the read Time information, location information, and current time information and location information of the mobile storage access device.

In addition, the method further includes: determining, by the traffic control node TN where the mobile storage access device is located, a time difference between current time information provided by the mobile storage access device and the read time information, and the mobile storage access The location information read by the device, the location information of the mobile storage access device, and the time difference are reported to the traffic management center TMC;

The TMC stores the time difference, location information read by the mobile storage access device, and location information of the mobile storage access device as entries in a database.

Or the method further includes: reporting, by the TN where the mobile storage access device is located, the information provided by the mobile storage access device to the TMC, where the TMC determines a time difference between the current time information and the read time information;

Or the method further includes: the TN where the mobile storage access device is located reports the information provided by the mobile storage access device to the TMC;

The TMC stores time information read by the mobile storage access device, location information, and current time information provided by the mobile storage access device and location information of the mobile storage access device as entries in a database.

Or the method further includes: determining, by the traffic control node TN where the mobile storage access device is located, a time difference between current time information provided by the mobile storage access device and the read time information, and storing the mobile storage access Location information read by the device, the mobile storage access The location information of the device and the time difference are stored in a local database for performing statistical analysis; when the reporting condition is met, the mobile storage access device reports the result of the statistical analysis to the TMC.

A mobile storage access device, comprising: a reading unit, a writing unit, and a transmitting unit;

The reading unit is configured to read time information and location information from the detected mobile storage device;

The writing unit is configured to write current time information and location information of the mobile storage access device into the mobile storage device;

The sending unit is configured to provide the current time information, location information of the mobile storage access device, and time information and location information read by the reading unit.

A traffic control node TN, the TN includes: the foregoing mobile storage access device, a computing unit, and a reporting unit;

The calculating unit is configured to determine a time difference between current time information provided by the mobile storage access device and time information read;

The reporting unit is configured to report the time difference, the location information read by the mobile storage access device, and the location information of the mobile storage access device to the TMC.

A traffic control node TN, the TN includes: the mobile storage access device and the reporting unit;

The reporting unit is configured to report the current time information provided by the mobile storage access device, the location information of the mobile storage access device, and the time information and location information read by the mobile storage access device to the TMC.

A traffic control node TN, the TN includes: the foregoing mobile storage access device, a computing unit, a storage unit, a statistical analysis unit, and a reporting unit;

The storage unit is configured to store location information read by the mobile storage access device, location information of the mobile storage access device, and the time difference in a database;

The statistical analysis unit is configured to perform statistical analysis of traffic information by using the database; and the reporting unit is configured to report the statistical analysis result of the statistical analysis unit to the TMC when the reporting condition is met.

A system for acquiring traffic information, the system comprising: a mobile storage access device and a mobile storage Device

The mobile storage access device, when detecting the mobile storage device carried by the vehicle, reads time information and location information from the mobile storage device, and writes current time information and location information of the mobile storage access device Entering the mobile storage device; and providing the read time information, location information, and current time information and location information of the mobile storage access device; the mobile storage device, configured to store the mobile storage access device write Time information and location information.

The mobile storage access device is disposed in the TN, the system further includes: a TMC, where the TN is configured to determine a time difference between current time information provided by the mobile storage access device and time information read, and The location information read by the mobile storage access device, the location information of the mobile storage access device, and the time difference are reported to the TMC;

The TMC is configured to store the time difference, the location information read by the mobile storage access device, and the location information of the mobile storage access device as an entry in a database.

Or the mobile storage access device is disposed in the TN, the system further includes a TMC; the TN is configured to report the information provided by the mobile storage access device to the TMC; The time information read by the mobile storage access device, the location information, and the current time information provided by the mobile storage access device, the location information of the mobile storage access device are stored as an entry in a database; or, the mobile storage is determined Accessing a time difference between current time information provided by the device and the read time information, and storing the time difference, location information read by the mobile storage access device, and location information of the mobile storage access device as a database Entry.

Alternatively, the mobile storage access device is disposed in the TN, the system further includes: a TMC, where the TN is configured to determine a time difference between current time information provided by the mobile storage access device and time information read, and And storing the location information read by the mobile storage access device, the location information of the mobile storage access device, and the time difference in a local database for performing statistical analysis; and when the reporting condition is met, reporting the result of the statistical analysis to the TMC;

The TMC is configured to receive a result of the statistical analysis reported by the TN.

It can be seen from the above technical solution that the present invention fully considers the characteristics of traffic information statistics, and the mobile storage access device reads time information and location information from the mobile storage device carried by the vehicle, and stores current time information and the mobile storage access. The location information of the device itself is written into the mobile storage device; thereby, the time information of the vehicle passing the previous mobile storage access device and the previous information can be obtained. The location information of the mobile storage access device, and the time information of the current mobile storage access device and the location information of the mobile storage access device, can be used to perform statistics of traffic information such as traffic, speed, and the like. The invention does not adopt the method of reading the unique identifier of the vehicle, ignoring the whereabouts of the specific vehicle, and because the traffic information statistics are separated from the specific vehicle identification, the privacy of the vehicle user is protected during the traffic information statistics process, thereby facilitating the traffic information statistics. Accepted by vehicle users. DRAWINGS

FIG. 1 is a schematic structural diagram of a traffic information acquiring system in the prior art.

FIG. 2 is a diagram of an example provided by an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a mobile storage access device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a first structure of a TN according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a second structure of a TN according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a third structure of a TN according to an embodiment of the present invention. detailed description

The invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

In order to more effectively supervise and control the traffic system, it is necessary to collect traffic statistics information. However, after analyzing the measurement needs of various traffic information, the inventors found that it is not necessary to acquire and record the whereabouts of each vehicle. For example, what we need to obtain is that a certain vehicle passes through A in time tl, and passes through B in time t2. It is completely negligible for which vehicle, that is, it is completely unnecessary to read the vehicle. The way of identification, even if the vehicle can provide no identification information at all, only provide time and location information, so as to ensure that the traffic behavior of the vehicle can be obtained without leaking the vehicle information.

Therefore, the method provided by the present invention may mainly include: the mobile storage access device reads time information and location information from the mobile storage device carried by the vehicle, and writes the current time information and the location information of the TN into the detected movement. In the storage device; providing read time information, location information, and current time information and location information of the mobile storage access device.

In the present invention, the interaction between the mobile storage access device and the mobile storage device may be in a radio frequency identification (RFID) manner, that is, the mobile storage access device may be a reader/writer with read and write functions. (Reader), the mobile storage device may be a radio frequency identification tag (RFID tag) having a storage function; or, the interaction between the mobile storage access device and the mobile storage device may adopt other wireless communication methods, such as a wireless local area network (WLAN). The mobile storage access device can be an access point device, and the mobile storage device can be a wireless terminal with a storage function. In the following description, Reader and RFID tag are taken as an example for description.

In the present invention, the RFID tag on the vehicle does not contain any identification information, and only the time information and location information written by the Reader need to be stored. The RFID tag can store time information and location information for each write. More preferably, each time the RFID receives the time information and the location information written by the Reader, the written time information and the location information may overwrite the originally stored time information and location information, and the following embodiments take this example as an example. .

The TN set on the roadside, when the vehicle passes, the Reader in the TN will detect the RFID tag on the vehicle, read the stored time information and location information from the detected RFID tag, and the current time information and the Reader's own location information is written to the RFID tag. The time information written may be the time when the RFID tag is detected; since the Reader is set in the TN, the location information of the Reader is the location information of the TN, where the location information may be the Reader or the TN. The identification information may also be the location index of the Reader or TN, and the like.

In addition, the TN where the Reader is located can use the information provided by the Reader to determine the time difference between the current time information and the read time information, which is the time taken by the vehicle from the previous TN to the TN, and then read the time difference together with the Reader. The location information and the location information of the Reader are reported to the TMC. At this time, the calculation function of the time difference needs to be implemented on the TN. In this way, the traffic information from the previous Reader to the Reader can be obtained at the TN. If the TN has the intelligent control function locally, the traffic information of the current location can be realized by using the acquired traffic information, for example, according to statistics. The flow rate information or the speed information to the traffic signal control of the traffic signal is realized. In this way, centralized control of each TN from the original TMC can be converted into distributed control of each TN, which can reduce the processing pressure of TMC and the network bandwidth pressure.

Alternatively, the TN where the Reader is located may also have the time difference calculation function, and directly report the information provided by the Reader to the TMC, and the TMC calculates the difference between the current time information provided by the Reader and the read time information.

The TMC stores the received information in the database. For example, the location information read by the Reader reported by the TN can be stored as the initial location, and the location information of the TN reported by the TN is stored as the end. The end position is then stored together with the time difference as an entry. When traffic information statistics are required, traffic information such as traffic from A to B, average speed information, and road congestion conditions can be obtained by using various entries in the database.

In addition, when the TN directly reports the information provided by the Reader to the TMC, the TMC can also store the time information and the location information read by the Reader, and the current time information provided by the Reader and the location information of the Reader as one entry. . When traffic information statistics are required, the corresponding algorithm is executed according to the entries in the database.

A specific example is given below, as shown in Fig. 2, assuming that a vehicle passes through three TNs in sequence, namely TN1, TN2 and TN3.

When TN1 passes, TN1 detects the RFID tag on the vehicle, reads the time information TO and the position information L0 stored in the RFID tag, and writes the current time information T1 and the position information L1 of TN1 into the RFID tag. The time information and location information stored by the RFID tag are T1 and L1, respectively. The TNI calculates the time difference Tdl = Tl - T0, and reports the time difference Tdl, the position information L0 and L1 to the TMC. The TMC stores Tdl, L0, and L1 as an entry in the database, which can indicate that the time taken from L0 to L1 is Tdl.

When TN2 passes, TN2 detects the RFID tag on the vehicle, reads the time information T1 and the position information L1 stored in the RFID tag, and writes the current time information T2 and the position information L2 of TN2 into the RFID tag. The time information and location information stored by the RFID tag are T2 and L2, respectively. The TNI calculates the time difference Td2 = T2-Tl, and reports the time difference Td2, the position information L1 and L2 to the TMC. The TMC stores Td2, L1 and L2 as an entry in the database, which can indicate that the time taken from L1 to L2 is Td2.

When passing TN3, TN3 detects the RFID tag on the vehicle, reads the time information T2 and the position information L2 stored in the RFID tag, and writes the current time information T3 and the position information L3 of TN3 into the RFID tag. The time information and location information stored by the RFID tag are T3 and L3, respectively. The TNI calculates the time difference Td3 = T3-T2, and reports the time difference Td3, position information L2 and L3 to the TMC. The TMC stores Td3, L2, and L3 as an entry in the database, which can indicate that the time taken from L2 to L3 is Td3.

When statistics are made on a larger number of vehicles, the TMC uses the entry information in the database to count the average speed of the vehicle from one TN to another. According to the average speed of the vehicle from one TN to another TN, it can be known whether the road section is congested, thereby adjusting the dredging or restriction of the road section. If the TN has the data statistics function locally, after the TN obtains the information read by the Reader, it may first determine the time difference between the current time information and the read time information, and the location information read by the Reader and the location information of the TN. And the determined time difference information is stored in the local database; the TN can use the local database for statistical analysis, and when the reporting condition is met, the statistical analysis result is reported to the TMC:. The reporting condition may be a fixed interval duration, a statistical analysis result, or a TMC or artificial trigger. In this way, statistical analysis is performed locally in the TN. The statistical analysis results reported to the TMC are not reported every time the vehicle passes, but are reported when the reporting conditions are met. Obviously, the TN and TMC are reduced. The interaction saves network bandwidth between TN and TMC.

The above is a detailed description of the method provided by the present invention, and the system and apparatus provided by the present invention are described in detail below.

The system provided by the present invention can still be as shown in FIG. 1, and includes: a mobile storage access device and a mobile storage device.

When the mobile storage access device detects the mobile storage device carried by the vehicle, the time information and the location information are read from the mobile storage device, and the current time information and the location information of the mobile storage access device are written into the mobile storage device; Providing read time information, location information, and current time information and location information of the mobile storage access device;

The mobile storage device stores time information and location information written by the mobile storage access device.

Preferably, the mobile storage device can replace the already stored time information and location information with time information and location information written by the mobile storage access device.

The mobile storage access device is disposed in the TN, the system further comprising: TMC;

The TN may have a certain computing function, and the TN determines a time difference between the current time information provided by the mobile storage access device and the read time information, and moves the location information read by the storage access device and the location of the mobile storage access device. Information and time difference are reported to TMC.

The TMC stores the time difference, the location information read by the mobile storage access device, and the location information of the mobile storage access device as entries in the database.

Alternatively, the TN may not have a computing function, but the computing function is centralized in the TMC. That is, the TN reports the information provided by the mobile storage access device to the TMC.

The TMC stores the time information read by the mobile storage access device, the location information, and the current time information provided by the mobile storage access device, the location information of the mobile storage access device as an entry in the database; or, determining the provision provided by the mobile storage access device Current time information and time of reading The time difference between the information, and the time difference, the location information read by the mobile storage access device, and the location information of the mobile storage access device are stored as entries in the database.

Preferably, the TN can have a statistical analysis function. At this time, the TN can determine the time difference between the current time information provided by the mobile storage access device and the read time information, and move the location information read by the mobile storage access device. The location information of the storage device and the determined time difference are stored in the local database for statistical analysis; when the reporting condition is met, the result of the statistical analysis is reported to the TMC. The TMC receives the statistical analysis result reported by the TN.

The above system architecture may be implemented by a virtual private network (VPN) of a public bearer network, or may be implemented by other forms of a private network.

FIG. 3 is a schematic structural diagram of a mobile storage access device according to an embodiment of the present invention. As shown in FIG. 3, the mobile storage access device may include: a reading unit 301, a writing unit 302, and a sending unit 303.

The reading unit 301 reads time information and location information from the detected mobile storage device.

The writing unit 302 writes the current time information and the location information of the mobile storage access device into the mobile storage device.

The transmitting unit 303 provides current time information, location information of the mobile storage access device, and time information and location information read by the reading unit.

In the mobile storage access device, the read time information and the location information can be cached by the storage unit provided by itself, and the time information and the location information to be written are cached.

The TN including the structure shown in Figure 3 can have the following three structures:

The first type: when the computing function is provided, as shown in FIG. 4, in addition to the mobile storage access device, the computing unit 401 and the reporting unit 402 are further included.

The calculation unit 401 determines the time difference between the current time information provided by the mobile storage access device and the read time information.

The reporting unit 402 reports the time difference, the location information read by the mobile storage access device, and the location information of the mobile storage access device to the TMC.

The second type: When the TN does not have the computing function, as shown in FIG. 5, in addition to the mobile storage access device, the reporting unit 501 is further included.

The reporting unit 501 will move the current time information provided by the storage access device, the location information of the mobile storage access device, and the time information and location information read by the mobile storage access device. The information is reported to TMC.

The third type: When the TN has the statistical analysis function, as shown in FIG. 6, in addition to the mobile storage access device, the calculation unit 601, the storage unit 602, the statistical analysis unit 603, and the reporting unit 604 are included.

The calculating unit 601 is configured to determine a time difference between current time information provided by the mobile storage access device and time information read.

The storage unit 602 is configured to store the location information read by the mobile storage access device, the location information of the mobile storage access device, and the time difference in a database.

The statistical analysis unit 603 is configured to perform statistical analysis of traffic information by using a database.

The reporting unit 604 is configured to report the statistical analysis result of the statistical analysis unit 603 to the TMC when the reporting condition is met.

As can be seen from the above description, the present invention fully considers the characteristics of traffic information statistics, the mobile storage access device reads time information and location information from the mobile storage device carried by the vehicle, and uses the current time information and the mobile storage access device. The location information of the user is written into the mobile storage device; thereby, the time information of the vehicle passing the previous mobile storage access device and the location information of the last mobile storage access device, and the time information of the current mobile storage access device and the The location information of the mobile storage access device, by which statistics of traffic information such as traffic, speed, and the like can be performed. The invention does not adopt the method of reading the unique identifier of the vehicle, ignoring the whereabouts of the specific vehicle, and because the traffic information statistics are separated from the specific vehicle identification, the privacy of the vehicle user is protected during the traffic information statistics process, thereby facilitating the traffic information statistics. Accepted by vehicle users.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

Claims

1. A method of obtaining traffic information, the method comprising:

2. The method according to claim 1, wherein the method further comprises: determining, by the traffic control node TN where the mobile storage access device is located, current time information and time of reading provided by the mobile storage access device a time difference between the information, and the location information read by the mobile storage access device, the location information of the mobile storage access device, and the time difference are reported to the traffic management center TMC;

The method according to claim 1, wherein the method further comprises: reporting, by the TN where the mobile storage access device is located, the information provided by the mobile storage access device

TMC, the TMC determines a time difference between the current time information and the read time information; the TMC compares the time difference, location information read by the mobile storage access device, and location of the mobile storage access device Information is stored as an entry in the database.

TMC;

The method according to claim 1, wherein the method further comprises: determining, by the traffic control node TN where the mobile storage access device is located, current time information and time of reading provided by the mobile storage access device a time difference between the information, and storing the location information read by the mobile storage access device, the location information of the mobile storage access device, and the time difference in a local database for statistical analysis; when the reporting condition is met, The mobile storage access device reports the results of the statistical analysis to the TMC.

6. A mobile storage access device, the mobile storage access device comprising: a reading unit, a writing unit, and a transmitting unit;

7. A traffic control node TN, the TN comprising: the mobile storage access device, the computing unit, and the reporting unit of claim 6;

8. A traffic control node TN, the TN comprising: the mobile storage access device and the reporting unit of claim 6;

A traffic control node TN, the TN comprising: the mobile storage access device, the computing unit, the storage unit, the statistical analysis unit, and the reporting unit according to claim 6;

10. A system for obtaining traffic information, the system comprising: a mobile storage access device and a mobile storage device;

The mobile storage access device is configured to detect a mobile storage device carried by the vehicle Reading the time information and the location information in the mobile storage device, and writing the current time information and the location information of the mobile storage access device to the mobile storage device; and providing the read time information, location information, and current The time information and the location information of the mobile storage access device; the mobile storage device is configured to store time information and location information written by the mobile storage access device.

The system according to claim 10, wherein the mobile storage access device is disposed in the TN, the system further comprising: TMC;

The TN is configured to determine a time difference between the current time information provided by the mobile storage access device and the read time information, and the location information read by the mobile storage access device, the mobile storage access device The location information and the time difference are reported to the TMC;

The system according to claim 10, wherein the mobile storage access device is disposed in a TN, the system further comprising a TMC;

The TN is configured to report information provided by the mobile storage access device to the TMC, and the TMC is configured to read time information, location information, and the mobile storage access device of the mobile storage access device. Providing current time information, location information of the mobile storage access device is stored as an entry in a database; or determining a time difference between current time information provided by the mobile storage access device and time information read, and The time difference, the location information read by the mobile storage access device, and the location information of the mobile storage access device are stored as entries in a database.

The TN is configured to determine a time difference between the current time information provided by the mobile storage access device and the read time information, and the location information read by the mobile storage access device, the mobile storage access device The location information and the time difference are stored in the local database for statistical analysis; when the reporting condition is met, the result of the statistical analysis is reported to the TMC;