CN102314768A - Traffic information collecting method, device and system - Google Patents

Abstract

The invention provides a traffic information collecting method, which is applied to a traffic information collecting system. The traffic information collecting system comprises a traffic information center, a wireless communication network and a plurality of detection vehicles with a vehicle-mounted device. The method comprises the following steps that: the vehicle-mounted device collects traffic data according to a sampling rate, and the collected traffic data is transmitted to the traffic information center through the wireless communication network; and the vehicle-mounted device also updates the sampling rate according to the traffic area and/or the time period in which the detection vehicle stays. The invention also provides a traffic information collecting device and a system. Due to the adoption of the method, the device and the system, the communication cost for the traffic data transmission can be reduced, and the operating cost and the calculation load of the traffic information center can be reduced.

Description

A traffic information collection method, device and system

technical field

The present invention relates to traffic information collection technology, in particular to a traffic information collection method, device and system based on floating car data (FCD, Floating Car Data).

Background technique

With the rapid development of our country's society and economy, the phenomenon of urban traffic congestion and oversaturation is becoming more and more serious. In order to improve the situation of urban traffic congestion, intelligent transportation systems (ITS, Intelligent Transportation System) have been gradually established in cities. Intelligence, traffic engineering, computer technology, information collection and intelligent control and other technologies. Among them, the traffic information collection system based on floating car data (FCD, Floating Car Data) is one of the key technologies of the intelligent transportation system. The data is analyzed to obtain real-time road traffic information in the city.

The FCD-based traffic information collection system (see "Research on Traffic Information Collection System Based on GPS Floating Vehicle", Authors: Jiang Guiyan, Chang Ande, Zhang Wei, "Traffic Information and Safety", Volume 27, Issue 04, 2009) mainly includes: Traffic information centers, wireless communication networks and a large number of probe vehicles (Probe Vehicles) used to collect traffic data, also known as floating vehicles, currently mainly use urban taxis as probe vehicles. Each detection vehicle is equipped with a vehicle-mounted device with GPS function and wireless communication function. This vehicle-mounted device can continuously collect traffic data at a specific sampling rate (Sampling Rate). The collected traffic data includes: latitude and longitude coordinates, time, speed , direction and other information. The on-board equipment in each detection vehicle sends the collected real-time traffic data to the traffic information center through the wireless communication network, and the traffic information center processes the traffic data centrally to generate road traffic flow information. Among them, the data sent by the vehicle-mounted equipment to the traffic information center may specifically include: the ID number of the vehicle-mounted equipment, latitude and longitude coordinates, instantaneous speed, direction, return time, vehicle running status and other fields; the traffic information center stores the data uploaded by the vehicle-mounted equipment, Preprocessing, combined with maps, using corresponding calculation models to estimate and predict traffic parameters such as speed and travel time, so as to obtain real-time dynamic traffic information of the entire road network, such as: driving speed, driving time and congestion status.

However, in the traffic information collection system of a city (especially a super-large city), there will be a large number of detection vehicles, and the vehicle-mounted equipment in each detection vehicle must upload the traffic data collected in each time period to the traffic network. In this way, the amount of data transmitted through the wireless communication network between the traffic information center and each vehicle-mounted device will be very large, which requires a large amount of wireless communication resources. In addition, after the traffic information center receives the traffic data from the detection vehicles, it needs to use complex calculations such as map matching and driving route estimation to finally process these traffic data into traffic condition information of various roads in the city and driving trips on road sections. Time and other data information, in which, the traffic information center needs to obtain the driving characteristics of each detected vehicle through map matching, and then gather the obtained driving characteristics of all detected vehicles to estimate the traffic flow information of the road. In this way, for a single detected vehicle The operation complexity and calculation amount of the system are relatively large, and at the same time, the number of detected vehicles is still large. Therefore, the traffic information center needs to bear a high operation cost and calculation amount to maintain a basically qualified traffic flow information estimate.

Contents of the invention

In order to solve the above technical problems, the embodiments of the present invention propose a method, device and system for collecting traffic information, so as to reduce the occupation of wireless communication resources, and reduce system operating costs and calculations.

An embodiment of the present invention provides a traffic information collection method, which is applied to a traffic information collection system. The traffic information collection system includes: a traffic information center, a wireless communication network, and a plurality of detection vehicles with on-board equipment. The method includes: the on-board device collects traffic data at a sampling rate, and transmits the traffic data to the traffic information center through the wireless communication network; the method further includes: the on-board device collects traffic data according to the detection vehicle The sampling rate is updated according to the change of the traffic area and/or the time period.

The embodiment of the present invention also provides a traffic information collection device, which is applied to a traffic information collection system. The traffic information collection system includes: a traffic information center, a wireless communication network, and multiple detection vehicles. The device is located at In the detection vehicle; the device includes: a global positioning system GPS module, a wireless communication module and a sampling rate update module, wherein: the GPS module is used to collect traffic data at a sampling rate; the wireless communication module is used to Transmit the traffic data collected by the GPS module to the traffic information center through the wireless communication network; and, the sampling rate updating module is used to transmit the traffic data collected by the GPS module according to the traffic area and/or the time period where the detection vehicle is located The change of determines the sampling rate that the GPS module should adopt, and updates the sampling rate of the GPS module.

An embodiment of the present invention further provides a traffic information collection system, which includes: a traffic information center, a wireless communication network, and a plurality of detection vehicles equipped with the above-mentioned traffic information collection device.

Using the method, device and system provided by the embodiments of the present invention can significantly reduce the amount of traffic data that needs to be collected and transmitted, thereby significantly reducing the communication cost of the wireless communication network, and will also significantly reduce the operating cost and calculation load of the traffic information center.

Description of drawings

Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those of ordinary skill in the art will be more aware of the above-mentioned and other features and advantages of the present invention. In the accompanying drawings:

FIG. 1 is a flowchart of a method for collecting traffic information according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a traffic information collection device according to an embodiment of the present invention; and,

Fig. 3 is a schematic diagram of a traffic information collection system according to an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The embodiment of the present invention proposes a traffic information collection method, which is applied to a traffic information collection system. The traffic information collection system includes: a traffic information center, a wireless communication network, and a plurality of detection vehicles with vehicle-mounted equipment, wherein the vehicle-mounted equipment Traffic data is collected at a variable sampling rate, which can be updated according to changes in the traffic area and/or time period.

In an embodiment of the present invention, the on-vehicle device updates the sampling rate according to the change of the traffic area where it is located. At this time, the area covered by the traffic information collection system should be divided into multiple traffic areas in advance; when the detection vehicle is driving across multiple traffic areas, the on-board equipment in the detection vehicle will detect the traffic area where it is located; When a new traffic area is detected, the vehicle-mounted device can determine a new sampling rate according to preset rules, and then collect traffic data at this new sampling rate.

Specifically, the preset rule can be a mapping relationship between multiple traffic areas and multiple sampling rates. When the vehicle-mounted device detects entering a new traffic area, it can determine the sampling rate corresponding to the new traffic area according to the mapping relationship. ; Optionally, the preset rule can also be an algorithm for calculating the sampling rate, and the algorithms for calculating the sampling rate for different traffic areas can be the same or different, so that when the vehicle-mounted device detects that a new traffic area, the sampling rate can be calculated according to the algorithm for this new traffic area. Here, the algorithm used to calculate the sampling rate may be related to the traffic area detected by the on-board equipment, the driving speed/direction of the detected vehicle, etc. The specific setting method of this algorithm is not the content of the present invention, and will not be further detailed here. stated.

By adopting the above-mentioned embodiment, it is possible to make the on-board equipment adopt different sampling rates in different traffic areas, for example: a higher sampling rate is used in a traffic area with a complex road network and a lower sampling rate is used in a traffic area with a relatively simple road network. The rate can significantly reduce redundant traffic data, and significantly reduce the communication cost of the wireless communication network and the operating cost and calculation load of the traffic information center.

In an embodiment of the present invention, the on-vehicle device updates the sampling rate according to the change of the time period. At this time, it is necessary to pre-divide multiple time periods related to traffic flow, such as three time periods: low-traffic period 22:00-7:00, high-traffic period 7:00-9:00&17:00-19:00 , Normal traffic period 9:00-17:00&19:00-22:00; when it is detected that it is in a new time period (for example: from a low-traffic period to a high-traffic period), the on-board equipment can determine according to the preset rules A new sampling rate, and then collect traffic data at this new sampling rate.

Specifically, the preset rule can be a mapping relationship between multiple time periods and multiple sampling rates. When the on-board device detects that it is in a new time period, it can determine the sampling rate corresponding to the new time period according to the mapping relationship. ; Optionally, the preset rule can be an algorithm for calculating the sampling rate, and the algorithms for calculating the sampling rate for different time periods can be the same or different, so that the on-board device detects that it is in a new time period When , the sampling rate can be calculated according to the algorithm for this new time period. Here, the algorithm used to calculate the sampling rate may be related to the time period detected by the on-board equipment, the driving speed/direction of the detected vehicle, etc. The specific setting method of this algorithm is not the content of the design of the present invention, and will not be further detailed here. stated.

By adopting the above-mentioned embodiment, it is possible for the on-board equipment to adopt different sampling rates in different time periods, for example: a higher sampling rate is used in high traffic peak hours and a lower sampling rate is used in relatively low traffic periods , thereby significantly reducing redundant traffic data, and significantly reducing the communication cost of the wireless communication network and the operating cost and computing load of the traffic information center.

In an embodiment of the present invention, the on-vehicle device updates the sampling rate according to changes in the traffic area and the time period. At this time, the area covered by the traffic information collection system should be divided into multiple traffic areas in advance, and multiple time periods related to traffic flow should be divided; the vehicle-mounted equipment detects the traffic area and its time period. When entering a new traffic area, the vehicle-mounted device can determine the new sampling rate that the vehicle-mounted device should adopt in the current time period in the new traffic area according to preset rules, or, when it detects that it is in a new time period , the vehicle-mounted device may determine the sampling rate that the vehicle-mounted device should adopt in the current traffic area within the new time period according to preset rules.

Specifically, the preset rule can be a mapping relationship between multiple traffic areas, multiple time periods, and multiple sampling rates. When the vehicle-mounted device detects entering a new traffic area, it can determine the new The sampling rate of each time period corresponding to the traffic area, and then determine the sampling rate corresponding to the current time period of the new traffic area; optionally, the preset rule can be an algorithm for calculating the sampling rate , and the algorithms used to calculate the sampling rate for different traffic areas can be the same or different, so that when the on-board device detects entering a new traffic area, it can be calculated according to the algorithm for this new traffic area to obtain the new traffic The sampling rate that the on-board devices in the area should adopt in the current time period. Here, the algorithm used to calculate the sampling rate may be related to the traffic area detected by the on-board equipment, the current time period, the driving speed/direction of the detected vehicle, etc. The specific setting method of this algorithm is not the content of the design of the present invention , without further details here.

Adopt above-mentioned embodiment, not only take into account the impact of traffic area on sampling rate, but also consider the impact on sampling rate of time period related to traffic flow, such as: use average higher sampling rate in traffic area with complex road network and in Traffic areas with relatively simple road networks use an average lower sampling rate, and further, different sampling rates can be used at different times in the same traffic area, so that the sampling rate of on-board equipment is more in line with actual needs and can further reduce redundancy traffic data, further reduce the communication cost of the wireless communication network and the operating cost and calculation load of the traffic information center, and further improve the performance of the FCD-based traffic information collection system.

In the above-mentioned embodiments of the present invention, the specific method for detecting the traffic area where the vehicle-mounted device is located may be as follows:

1. Divide the area covered by the traffic information collection system into multiple traffic areas based on latitude and longitude in advance, that is, each traffic area can be defined by a series of latitude and longitude thresholds; the on-board equipment can determine the current traffic location according to the latitude and longitude coordinates currently collected. area.

2. Divide the area covered by the traffic information collection system into multiple traffic areas based on the cells covered by the wireless communication network in advance, so that a traffic area includes one or more cells, and establish a mapping relationship between traffic areas and cells. In this mapping relationship, the only traffic area can be determined according to a cell; the vehicle-mounted device can determine the current traffic area according to the preset mapping relationship from the cell to the traffic area and the cell ID currently received by the vehicle-mounted device. Here, the mapping relationship from the cell to the traffic area can be implemented as a mapping table from the cell ID to the traffic area ID; since the vehicle-mounted device itself has a wireless communication function, it can receive a message issued by the wireless communication network when entering a cell. Cell ID, the present invention uses the information of the cell ID sent to the vehicle-mounted device by the wireless communication network to enable the vehicle-mounted device to quickly determine the current traffic area.

In the above-mentioned embodiments of the present invention, the rules for determining the sampling rate may be sent to the vehicle-mounted equipment by the traffic information center through the wireless communication network when the vehicle-mounted equipment is initialized, or it may be the factory setting of the vehicle-mounted equipment. Further, this rule also It can be dynamically updated by the traffic information center through a wireless communication network (such as a broadcast channel, etc.) during the operation of the vehicle-mounted equipment.

Fig. 1 is a flow chart of a method for collecting traffic information according to an embodiment of the present invention. In this embodiment, the area covered by the traffic information collection system is divided into multiple traffic areas based on the cells covered by the wireless communication network, wherein each traffic area includes one or more cells. As shown in Figure 1, this process includes the following steps:

Step 101: The on-board equipment in the detection vehicle detects whether a new traffic area is entered, and collects traffic data at a certain sampling rate.

Step 102: When detecting entering a new traffic area, the vehicle-mounted device determines a sampling rate corresponding to the new traffic area.

Specifically, the vehicle-mounted device is pre-configured with a mapping table from cell ID to traffic area ID. Using this mapping table, the vehicle-mounted device can determine the ID of the traffic area it is currently in according to the cell ID it receives from the wireless communication network. When the on-vehicle device finds that the determined traffic area ID changes, it can determine to enter a new traffic area.

Specifically, the above mapping table may further include a mapping from the traffic area ID to the sampling rate, so that when a new traffic area is detected, the sampling rate can be obtained according to the ID mapping of the new traffic area by using this mapping table; Optionally, the above-mentioned mapping table may further include a mapping from the traffic area ID to an algorithm for calculating the sampling rate, so that when a new traffic area is detected, the mapping table can be used according to the ID of the new traffic area The mapping results in an algorithm according to which the sampling rate can be calculated.

Specifically, the aforementioned mapping from the traffic area ID to the sampling rate may also be related to the time period. At this time, the above mapping table includes the mapping from the traffic area ID to each time period and each sampling rate. When entering a new traffic area, the sampling rate of each time period corresponding to the new traffic area can be determined according to the traffic area ID, and then the sampling rate that the on-board equipment in the new traffic area should adopt in the current time period is determined; The aforementioned algorithm for calculating the sampling rate can also be related to the time period, so that when the vehicle-mounted device detects entering a new traffic area, it can obtain an algorithm related to the time period according to the traffic area ID mapping, and then use this algorithm to calculate The sampling rate that the on-board device should adopt in the current time period in the new traffic area.

Step 103: collect traffic data at the sampling rate determined in step 102.

The embodiment of the present invention also provides a traffic information collection device, which is applied to a traffic information collection system. The traffic information collection system includes: a traffic information center, a wireless communication network, and a plurality of detection vehicles. The traffic data is collected according to the sampling rate, and the collected traffic data is sent to the traffic information center through the wireless communication network, and the sampling rate can be updated according to the change of the traffic area and/or the time period. This device can be embodied as an on-board device in the detection vehicle or integrated in the on-board device. This device may include: a GPS module, a wireless communication module and a sampling rate update module, wherein:

The GPS module is used to collect traffic data at a certain sampling rate.

The wireless communication module is used to send the traffic data collected by the GPS module to the traffic information center through the wireless communication network.

The sampling rate update module is used to determine the sampling rate that the GPS module should adopt according to the change of the traffic area and/or the time period, and update the sampling rate of the GPS module.

In an embodiment of the present invention, the sampling rate updating module updates the sampling rate according to the change of the traffic area where it is located. At this time, the area covered by the traffic information collection system should be divided into multiple traffic areas in advance; when the detection vehicle is driving across multiple traffic areas, the sampling rate update module detects the traffic area where it is located; When entering a new traffic area, the sampling rate update module can determine a new sampling rate that the GPS module should adopt according to preset rules.

Specifically, the preset rule can be a mapping relationship between multiple traffic areas and multiple sampling rates. When the sampling rate update module detects entering a new traffic area, it can determine the corresponding traffic area of the new traffic area according to the mapping relationship. Sampling rate; Optionally, the preset rule can also be an algorithm for calculating the sampling rate, and the algorithms for calculating the sampling rate for different traffic areas can be the same or different, so that the sampling rate update module detects When entering a new traffic area, the sampling rate can be calculated according to the algorithm for this new traffic area.

In an embodiment of the present invention, the sampling rate updating module updates the sampling rate according to the change of the time period. At this time, multiple time periods related to traffic flow should be pre-divided; when a new time period is detected, the sampling rate updating module can determine a new sampling rate that the GPS module should adopt according to preset rules.

Specifically, the preset rule can be a mapping relationship between multiple time periods and multiple sampling rates. When the sampling rate update module detects that it is in a new time period, it can determine the corresponding time period of the new time period according to the mapping relationship. Sampling rate; optionally, the preset rule can be an algorithm for calculating the sampling rate, and the algorithms for calculating the sampling rate for different time periods can be the same or different, so that when the sampling rate update module detects that it is in When a new time period is specified, the sampling rate can be calculated according to an algorithm for the new time period.

In an embodiment of the present invention, the sampling rate update module updates the sampling rate according to changes in the traffic area and the time period. At this time, the area covered by the traffic information collection system should be divided into multiple traffic areas in advance, and multiple time periods related to traffic flow should be divided; the sampling rate update module detects the traffic area and its time period, When it is detected that a new traffic area is entered, the sampling rate update module can determine the new sampling rate that the GPS module should adopt in the current time period in the new traffic area according to preset rules, or when it is detected that it is in a new traffic area. During the time period, the sampling rate update module can determine the sampling rate that the GPS module should adopt in the current traffic area within the new time period according to preset rules.

Specifically, the preset rule can be a mapping relationship between multiple traffic areas, multiple time periods, and multiple sampling rates. When the vehicle-mounted device detects entering a new traffic area, it can determine the new The sampling rate of each time period corresponding to the traffic area, and then determine the sampling rate corresponding to the current time period of the new traffic area; optionally, the preset rule can be an algorithm for calculating the sampling rate , and the algorithms used to calculate the sampling rate for different traffic areas can be the same or different, so that when the sampling rate update module detects entering a new traffic area, it can be calculated according to the algorithm for this new traffic area. The sampling rate that the GPS module should adopt in the current time period in the traffic area.

In the above-mentioned embodiment of the present invention, the specific method for detecting the traffic area where the sampling rate update module is located may be:

1. Divide the area covered by the traffic information collection system into multiple traffic areas based on latitude and longitude in advance, that is, each traffic area can be defined by a series of latitude and longitude thresholds; the sampling rate update module can be determined according to the latitude and longitude coordinates currently collected by the GPS module Current traffic zone.

2. Divide the area covered by the traffic information collection system into multiple traffic areas based on the cells covered by the wireless communication network in advance, so that one traffic area includes one or more cells, and establish links between multiple traffic areas and multiple cells Mapping relationship, like this, in this mapping relationship, can determine unique traffic zone according to a cell; The sampling rate update module can determine according to the mapping relationship from cell to traffic zone preset and the cell ID currently received by the wireless communication module Current traffic zone. Here, the mapping relationship from the cell to the traffic area can be implemented as a mapping table from the cell ID to the traffic area ID; since the traffic information collection device itself has a wireless communication module, it can receive information from the wireless communication network when entering a cell. The cell ID sent, the present invention uses the information of the cell ID sent to the wireless communication module by the wireless communication network to make the sampling rate update module quickly determine the current traffic area.

In the above-mentioned embodiments of the present invention, the rules for determining the sampling rate may be sent to the wireless communication module by the traffic information center through the wireless communication network when the traffic information collection device is initialized, and the wireless communication module sends the rules to the sampling rate updating Module, this rule can also be the factory setting of the traffic information collection device; further, this rule can also be dynamically updated by the traffic information center through the broadcast channel of the wireless communication network during the operation of the traffic information collection device, wherein the traffic information The center sends the updated rules to the wireless communication module through the wireless communication network, and the wireless communication module sends the updated rules to the sampling rate updating module.

Fig. 2 is a schematic diagram of a traffic information collection device according to an embodiment of the present invention. In this embodiment, the area covered by the traffic information collection system is divided into multiple traffic areas based on the multiple cells covered by the wireless communication network, wherein each traffic area includes one or more cells. As shown in Figure 2, this traffic information collecting device comprises: GPS module 201, wireless communication module 202 and sampling rate updating module 203, wherein:

The GPS module 201 collects traffic data at a certain sampling rate.

The wireless communication module 202 sends the traffic data collected by the GPS module 201 to the traffic information center through the wireless communication network.

Sampling rate updating module 203 detects whether to enter into new traffic area, when detecting to enter new traffic area, determines the corresponding sampling rate of new traffic area, and the sampling rate of GPS module 201 is updated as the currently determined sampling rate .

Specifically, the sampling rate updating module 203 is pre-configured with a mapping table from the cell ID to the traffic area ID. Using this mapping table, the sampling rate updating module 203 can determine the current cell ID according to the cell ID received by the wireless communication module 202 from the wireless communication network The ID of the traffic area where the user is located can be determined to enter a new traffic area when the sampling rate update module 203 finds that the determined traffic area ID changes.

Specifically, the above mapping table may further include a mapping from the traffic area ID to the sampling rate, so that when a new traffic area is detected, the sampling rate can be obtained according to the ID mapping of the new traffic area by using this mapping table; Optionally, the above-mentioned mapping table may further include a mapping from traffic area ID to an algorithm for calculating the sampling rate, so that when the sampling rate updating module 203 detects that a new traffic area is entered, the mapping table can be used to calculate the sampling rate according to the new traffic area. An algorithm is obtained from the ID mapping of the traffic area, and then the sampling rate that the GPS module 201 should adopt in the new traffic area is calculated according to the algorithm.

Optionally, the aforementioned mapping from the traffic area ID to the sampling rate can also be related to the time period. At this time, the above-mentioned mapping table includes the mapping from the traffic area ID to each time period and each sampling rate, and the sampling rate update module 203 When a new traffic area is detected, the sampling rate of each time period corresponding to the new traffic area can be determined according to the traffic area ID, and then the GPS module 201 in the new traffic area should be determined in the current time period. Sampling rate adopted; Optionally, the aforementioned algorithm for calculating the sampling rate may also be related to the time period, so that the sampling rate update module 203 can obtain a and An algorithm related to the time period, and then use this algorithm to calculate the sampling rate that the GPS module 201 should adopt in the current time period in the new traffic area.

The device provided by the above embodiments of the present invention may be implemented as a hardware device, or may be a virtual device implemented in software.

The embodiment of the present invention also provides a traffic information collection system, which includes: a traffic information center, a wireless communication network, and a plurality of detection vehicles equipped with on-board equipment; Collect traffic data, send the collected traffic data to the traffic information center through the wireless communication network, and update the sampling rate according to the change of the traffic area and/or the time period.

Specifically, the on-vehicle device in the above system can update the sampling rate according to the method provided in the foregoing embodiments of the present invention.

Optionally, the on-vehicle device in the above system may be the device provided by the foregoing embodiments of the present invention or be built with the device.

Optionally, the traffic information center in the above-mentioned system can issue rules for determining the sampling rate to the vehicle-mounted device through the wireless communication network when the vehicle-mounted device is initialized. Further, this rule can also be determined by the traffic information during the operation of the vehicle-mounted device. The center updates dynamically through the broadcast channel of the wireless communication network.

Fig. 3 is a schematic diagram of a traffic information collection system according to an embodiment of the present invention. As shown in Figure 3, this system includes: a traffic information center, a wireless communication network, and multiple detection vehicles deployed with on-board equipment, such as detection vehicle 1, detection vehicle 2, ..., detection vehicle n in Figure 3 . in:

The on-board equipment in each detection vehicle collects traffic data at a certain sampling rate and transmits it to the traffic information center through the wireless communication network. The traffic information center collects these traffic data to obtain road traffic flow information. The on-board equipment in each detection vehicle also updates the sampling rate according to the change of the traffic area and/or the time period. Here, each vehicle-mounted device in the detection vehicle 1 to detection vehicle n can update the sampling rate according to the method provided in the above-mentioned embodiment of the present invention, and the specific method for updating the sampling rate will not be repeated here.

When the on-board equipment in each detection vehicle is initialized, the traffic information center issues the rules for determining the sampling rate to the on-board equipment through the wireless communication network; further, during the operation of these on-board equipment, the traffic information center can also pass the wireless communication network (For example, through a broadcast channel, etc.) Dynamically update the rules for determining the sampling rate in the on-board device. Wherein, the in-vehicle device may be the traffic information collection device provided in the foregoing embodiments or have the traffic information collection device built in, and the specific implementation principle of the in-vehicle device will not be repeated here.

By adopting the traffic information collection method, device and system provided by the above-mentioned embodiments of the present invention, the data to be collected and transmitted by the on-board equipment in the detection vehicle will be significantly reduced. Therefore, the communication cost of the wireless communication network will be significantly reduced, and at the same time it will be significantly reduced. The operating cost and computing load of the traffic information center are reduced, thereby significantly improving the overall performance of the FCD-based traffic information collection system.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (15)

1. A traffic information collection method is applied to a traffic information collection system, and the traffic information collection system comprises: a traffic information center, a wireless communication network, and a plurality of probe vehicles with onboard devices, the method comprising:

the vehicle-mounted equipment acquires traffic data according to a sampling rate and transmits the traffic data to the traffic information center through the wireless communication network;

characterized in that the method further comprises:

and the vehicle-mounted equipment updates the sampling rate according to the change of the traffic area and/or the time period of the detection vehicle.

2. The method according to claim 1, characterized in that the area covered by the traffic information acquisition system is divided into a plurality of traffic areas in advance; the on-board device updates the sampling rate according to the change of the traffic area where the detection vehicle is located, and the method comprises the following steps:

when entering a new traffic area is detected, determining a sampling rate to be adopted in the new traffic area according to a preset rule, and updating the sampling rate.

3. The method according to claim 1, characterized in that the area covered by the traffic information acquisition system is divided into a plurality of traffic areas in advance, and a plurality of time periods related to traffic flow are divided; the method for updating the sampling rate by the vehicle-mounted equipment according to the change of the traffic area and the time period of the detection vehicle comprises the following steps:

when entering a new traffic area is detected, determining a sampling rate to be adopted in the current time period in the new traffic area according to a preset rule, and updating the sampling rate; or,

and when detecting that the traffic area is in a new time period, determining the sampling rate which should be adopted in the current traffic area in the new time period according to a preset rule, and updating the sampling rate.

4. The method according to claim 1, characterized in that a plurality of time periods related to traffic flow are divided in advance; the on-board device updates the sampling rate according to the change of the time period of the detection vehicle, and comprises the following steps:

and when detecting that the time is in a new time period, determining the sampling rate to be adopted in the new time period according to a preset rule, and updating the sampling rate.

5. The method of claim 2 or 3, wherein dividing the area covered by the traffic information collection system into a plurality of traffic zones comprises: dividing a plurality of traffic areas based on a plurality of CELLs covered by the wireless communication network, wherein one traffic area comprises one or more CELLs, and establishing a mapping from a CELL identity CELL ID to a traffic area identity ID; and a process for the preparation of a coating,

the detecting of entry into a new traffic zone includes: mapping according to the CELL identification CELL ID received from the wireless communication network to obtain the traffic area identification ID of the current traffic area; and if the mapped traffic area identification ID is changed, determining to enter a new traffic area.

6. The method of claim 5, further comprising: establishing a mapping from the traffic zone identification ID to a rule for determining a sampling rate;

and when the new traffic area is determined to enter, mapping according to the traffic area identification ID to obtain a rule for determining the sampling rate, and determining the sampling rate to be adopted according to the rule obtained by mapping.

7. The method according to any one of claims 2 to 4, wherein the preset rule is factory setting of the vehicle-mounted device, or is issued to the vehicle-mounted device by the traffic information center through the wireless communication network when the vehicle-mounted device is initialized; and/or the presence of a gas in the gas,

and in the running process of the vehicle-mounted equipment, the preset rule is dynamically updated by the traffic information center through the wireless communication network.

8. A traffic information collection device applied to a traffic information collection system, the traffic information collection system comprising: a traffic information center, a wireless communication network, and a plurality of probe vehicles, wherein the apparatus is located in the probe vehicles; the device comprises: global positioning system GPS module, wireless communication module and sampling rate update module, wherein:

the GPS module is used for collecting traffic data according to a sampling rate;

the wireless communication module is used for transmitting the traffic data acquired by the GPS module to the traffic information center through the wireless communication network; and a process for the preparation of a coating,

and the sampling rate updating module is used for determining the sampling rate which the GPS module needs to adopt according to the change of the traffic area and/or the time period in which the detection vehicle is positioned, and updating the sampling rate of the GPS module.

9. The apparatus of claim 8, wherein the area covered by the traffic information collection system is divided into a plurality of traffic zones;

and the sampling rate updating module detects the traffic area where the GPS module is located, and determines the sampling rate which the GPS module should adopt in the new traffic area according to a preset rule when the GPS module is detected to enter the new traffic area.

10. The apparatus according to claim 8, wherein the area covered by the traffic information collection system is divided into a plurality of traffic areas and a plurality of time periods related to traffic flow;

the sampling rate updating module is used for detecting the traffic area and the time period of the traffic area, and when the traffic area enters a new traffic area, the sampling rate which is adopted by the GPS module in the new traffic area in the current time period is determined according to a preset rule; or,

and when detecting that the traffic area is in a new time period, determining the sampling rate which should be adopted in the current traffic area in the new time period according to a preset rule.

11. The apparatus according to claim 8, characterized in that a plurality of time periods related to the traffic flow are previously divided;

and the sampling rate updating module detects the time period, and determines the sampling rate to be adopted by the GPS module in the new time period according to a preset rule when the time period is detected to be in the new time period.

12. The apparatus of claim 9 or 10, wherein the area covered by the traffic information collection system is divided into a plurality of traffic areas based on the cells covered by the wireless communication network, wherein one traffic area comprises one or more cells; the sampling rate updating module is internally established with mapping from a CELL identifier CELL ID to a traffic area identifier ID;

the sampling rate updating module is used for mapping to obtain a traffic area identifier ID of the current traffic area according to a CELL identifier CELL ID received by the wireless communication module from the wireless communication network when detecting the traffic area; and determining to enter a new traffic area if the mapped traffic area identification ID is changed.

13. The apparatus of claim 12, wherein the sampling rate update module is further configured to map traffic zone Identification (ID) to rules for determining sampling rate;

and when the sampling rate updating module determines to enter a new traffic area, mapping according to the traffic area identification ID to obtain a rule for determining the sampling rate, and determining the sampling rate which should be adopted by the GPS module according to the rule obtained by mapping.

14. The device according to any one of claims 9 to 11, wherein the preset rule is factory setting of the traffic information collection device, or is issued to the wireless communication module by the traffic information center through the wireless communication network when the traffic information collection device is initialized, and then is sent to the sampling rate update module by the wireless communication module; and/or the presence of a gas in the gas,

and in the running process of the traffic information acquisition device, the preset rule is dynamically updated by the traffic information center, wherein the traffic information center issues the updated rule to the wireless communication module through the wireless communication network, and then the wireless communication module sends the updated rule to the sampling rate updating module.

15. A traffic information collection system, comprising: traffic information center, wireless communication network, a plurality of probe vehicles with a traffic information collecting device according to any of claims 8 to 14.

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