CN102385798A - Traffic information collecting method, device and system - Google Patents
Traffic information collecting method, device and system Download PDFInfo
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- CN102385798A CN102385798A CN2010102709847A CN201010270984A CN102385798A CN 102385798 A CN102385798 A CN 102385798A CN 2010102709847 A CN2010102709847 A CN 2010102709847A CN 201010270984 A CN201010270984 A CN 201010270984A CN 102385798 A CN102385798 A CN 102385798A
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Abstract
The invention provides a traffic information collecting method, which is applied to a traffic information collecting system, and the traffic information collecting system comprises a traffic information center, a wireless communication network and a plurality of detecting vehicles with a vehicle-mounted device. The traffic information collecting method is that: the vehicle-mounted device collects traffic data, and the traffic data are transmitted to the traffic information center through a wireless communication network; after collecting the traffic information, the vehicle-mounted device defines the traffic regions of the traffic data and interlinks the traffic data with the traffic regions; after transmitting the traffic data, the vehicle-mounted device transmits the information of the traffic regions interlinked with the traffic data to the traffic information center; and the traffic information center groups the received traffic data and respectively performs traffic flow information evaluation to each group of the traffic data. The traffic data interlinked with the information of the same traffic region belong to the same group. The invention further provides a corresponding traffic information collecting device and the traffic information collecting system. The traffic information collecting method, the traffic information collecting device and the traffic information collecting system can improve the processing efficiency of the traffic information center and reducing operation cost and computer loads.
Description
Technical field
The present invention relates to the traffic information collection technology, particularly a kind of traffic information collection method, device and system based on unsteady vehicle data (FCD, Floating Car Data).
Background technology
Along with Chinese society and rapid development of economy; Urban traffic blocking and supersaturation are on the rise; For improving the urban traffic blocking situation; Begun in the city, progressively to set up intelligent transportation system (ITS, Intelligent Transportation System) at present, it combines technology such as artificial intelligence, traffic engineering, computer technology, information acquisition and Based Intelligent Control.Wherein, Based on unsteady vehicle data (FCD; Floating Car Data) traffic information acquisition system is one of gordian technique of intelligent transportation system; The GPS that it can collect unsteady vehicles a large amount of in the city (GPS, Global Position System) data are analyzed, to obtain city Real-time Road transport information.
Based on the traffic information acquisition system of FCD (referring to " based on the traffic information acquisition system research of GPS Floating Car "; Author: Jiang Guiyan, Chang Ande, Zhang Wei; " transport information and safety " 2009 the 27th the 04th phase of volume) mainly comprises: traffic information center, cordless communication network and be used to gather the detection vehicle (Probe Vehicle) of traffic data in a large number; It is also referred to as unsteady vehicle, mainly is to utilize urban taxi as detection vehicle at present.Each detection vehicle has all been disposed the mobile unit with GPS function and radio communication function; This mobile unit can be gathered traffic data with specific sampling rate (Sampling Rate) continuously, and the traffic data of being gathered comprises: information such as latitude and longitude coordinates, time, speed, direction.Mobile unit in each detection vehicle sends to traffic information center through the real time traffic data that cordless communication network will collect separately, by traffic information center these traffic datas is focused on, to generate road traffic flow information.Wherein, the mobile unit data that send to traffic information center can specifically comprise: field such as mobile unit ID number, latitude and longitude coordinates, instantaneous velocity, direction, passback time, travel condition of vehicle; The data that traffic information center is uploaded mobile unit are stored, pre-service; In conjunction with map use corresponding calculated model to estimating like traffic parameters such as speed, journey times and predicting; Thereby obtain the real-time and dynamic traffic flow information of whole road network, for example comprise: travel speed, running time and congestion etc.
Yet; In the traffic information acquisition system in a city (especially super large city); The huge detection vehicle of quantity will be arranged, and the mobile unit in each detection vehicle all will be uploaded to traffic information center with its traffic data that collects in each time period, and traffic information center is behind the traffic data that receives from each detection vehicle; Need and utilize the corresponding calculated model through map match; These traffic datas finally are processed into the traffic flow information of each bar road of city, and wherein, traffic information center at first will restore the ride characteristic of each detection vehicle; For example comprise: Vehicle Speed, running time, travel direction etc., and then assemble the traffic flow information of the ride characteristic of all detection vehicles that restored with the estimation road.Like this; Complicated operation degree and calculated amount to the single detective vehicle are bigger, and simultaneously, the quantity of detection vehicle is also very big; Therefore, traffic information center need be born very high running cost and have very high computing power and kept a qualified basically traffic flow information estimation.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the invention has proposed a kind of traffic information collection method, Apparatus and system, estimates so that traffic information center can utilize system resource to accomplish traffic flow information more fully.
The embodiment of the invention provides a kind of traffic information collection method; This method is applied to a kind of traffic information acquisition system; Said traffic information acquisition system comprises: traffic information center, cordless communication network and a plurality of detection vehicle that has mobile unit; This method comprises: said mobile unit is gathered traffic data, and transmits said traffic data through said cordless communication network and give said traffic information center; Further, said mobile unit is confirmed the traffic zone under the said traffic data after gathering said traffic data, and with said traffic data with its under the information of traffic zone be associated; Said mobile unit transmits the information of the traffic zone that is associated with said traffic data and gives said traffic information center when transmitting said traffic data; And said traffic information center divides into groups to the traffic data of being received, and each group traffic data is carried out traffic flow information respectively estimate; Wherein, belong to same group with the traffic data that the information of identical traffic zone is associated.
The embodiment of the invention also provides a kind of traffic information collecting apparatus, and this device is applied to a kind of traffic information acquisition system, and said traffic information acquisition system comprises: traffic information center, cordless communication network and a plurality of detection vehicle; Said device is arranged in said detection vehicle; Said device comprises: global position system GPS module, wireless communication module and traffic zone relating module, and wherein: said GPS module is used to gather traffic data; Said traffic zone relating module is used to receive the traffic data from said GPS module, confirms the traffic zone under the said traffic data, and said traffic data is associated with the information of traffic zone under it; Said wireless communication module is used for will sending to said traffic information center from the information of the traffic data of said traffic zone relating module and related traffic zone thereof through said cordless communication network.
The embodiment of the invention further provides a kind of traffic information acquisition system, comprising: traffic information center, cordless communication network and a plurality of detection vehicle, and wherein, said detection vehicle has above-mentioned traffic information collecting apparatus; Said traffic information center is used for the traffic data of being received is divided into groups, and each group traffic data is carried out traffic flow information respectively estimate; Wherein, belong to same group with the traffic data that the information of identical traffic zone is associated.
The method that the employing embodiment of the invention provides, the treatment effeciency that Apparatus and system can significantly improve traffic information center; Make distributed treatment and parallel processing become possibility, and then reduce the running cost and the calculated load of traffic information center for traffic data.
Description of drawings
To make clearer above-mentioned and other feature and advantage of the present invention of those of ordinary skill in the art through describe exemplary embodiment of the present invention in detail with reference to accompanying drawing below, in the accompanying drawing:
Fig. 1 is the traffic information collection method flow diagram according to one embodiment of the invention;
Fig. 2 is the traffic information collection method flow diagram according to another embodiment of the present invention;
Fig. 3 is the traffic information collecting apparatus synoptic diagram according to one embodiment of the invention;
Fig. 4 is the traffic information collecting apparatus process flow diagram according to another embodiment of the present invention;
Fig. 5 is the traffic information collection method synoptic diagram according to one embodiment of the invention;
Fig. 6 A is the traffic information collecting apparatus synoptic diagram according to one embodiment of the invention;
Fig. 6 B is the traffic information collecting apparatus synoptic diagram according to another embodiment of the present invention; And,
Fig. 7 is the traffic information acquisition system synoptic diagram according to one embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only is used to explain the present invention, and be not used in qualification the present invention.
The embodiment of the invention has proposed a kind of traffic information collection method; It is applied to traffic information acquisition system; This traffic information acquisition system comprises: traffic information center, cordless communication network and a plurality of detection vehicle that has mobile unit; Each mobile unit is used to gather traffic data, and transmits the traffic data that collects through cordless communication network and give traffic information center.Further; Mobile unit is after gathering traffic data; Confirm the traffic zone under this traffic data, and this traffic data is associated with the information of traffic zone under it, in addition; Mobile unit also transmits the information of the traffic zone that is associated with traffic data transmitting traffic data in the traffic information center.Afterwards, traffic information center divides into groups to the traffic data of being received according to the information of the traffic zone of being received, and each group traffic data is carried out traffic flow information respectively estimate.
Wherein, Each part traffic data that mobile unit is sent to traffic information center is the information of a related traffic zone all; Like this; Traffic information center can confirm to belong to the traffic data of each traffic zone according to the information of the traffic zone of being received, and then can divide into groups to the traffic data of being received by traffic zone, will be classified as one group with the traffic data that the information of identical traffic zone is associated.When traffic information center carries out the traffic flow information estimation to certain group traffic data; It can utilize this group traffic data to restore the ride characteristic of each detection vehicle in the traffic zone of this group under traffic data through map match; And then assemble the traffic flow information that the ride characteristic of each detection vehicle in this traffic zone is estimated road in this traffic zone, and such as: estimate Vehicle Speed, congestion etc. in this traffic zone.
In embodiments of the present invention, mobile unit with the traffic data of being gathered with its under the concrete grammar that is associated of the information of traffic zone can for:
1, based on longitude and latitude the traffic information acquisition system region covered is divided into a plurality of traffic zones in advance, that is: each traffic zone can be delimited by one group of longitude and latitude thresholding; To each part traffic data that collects; Mobile unit can be confirmed the traffic zone under the latitude and longitude coordinates of this part traffic data according to the longitude and latitude thresholding that is used for delimiting traffic zone, and with the information of determined traffic zone therewith a part traffic data associate.
2, based on the cordless communication network cell covered traffic information acquisition system region covered is divided into a plurality of traffic zones in advance; Make a traffic zone comprise one or more sub-districts; And set up the mapping relations between a plurality of traffic zones and a plurality of sub-district; In these mapping relations, can confirm unique traffic zone according to a sub-district; When collecting a traffic data at every turn; The traffic zone that mobile unit is confirmed current place according to predefined mapping relations and the current cell ID that receives (CELL ID) from the sub-district to the traffic zone associates the information of current definite traffic zone and the traffic data of current collection again.Here, said mapping relations from the sub-district to the traffic zone can be implemented as the mapping table from cell ID (CELL ID) to the information of traffic zone;
Because mobile unit itself possesses radio communication function; It can receive the CELL ID that cordless communication network issues when getting into a sub-district, the present invention can utilize this information of CELL ID that cordless communication network is handed down to mobile unit to make mobile unit confirm the traffic zone at current place fast.
In embodiments of the present invention; The information that mobile unit transmits the traffic zone be associated with traffic data give traffic information center concrete grammar can for: transmit the new message unit of increase in the communication information of traffic data at mobile unit to traffic information center, this new message unit is used to carry the information of traffic zone.In addition, mobile unit can with initiatively or passive mode transmit traffic data and the information of the traffic zone that is associated with it to traffic information center.Here, so-called mode initiatively refers to mobile unit and perhaps initiatively transmits data to traffic information center with the mode of Event triggered at interval by preset time; So-called passive mode refers to the traffic information center initiation request and extracts data from mobile unit.
In embodiments of the present invention, can set unique identification (ID) for each traffic zone, this sign can be described as traffic zone sign (traffic zone ID), and like this, the information of above-mentioned traffic zone just can be traffic zone ID.In addition, the information of said traffic zone also can be the information that other suitable being used to identifies each traffic zone.
In embodiments of the present invention; Compared with prior art; Traffic information center needn't utilize all traffic datas that collected to restore and the ride characteristic of interior all detection vehicles of gathering traffic information acquisition system institute's region covered is estimated to carry out traffic flow information; But can utilize the traffic flow information of each traffic zone in the traffic information acquisition system institute region covered is estimated respectively through the traffic data that divides into groups; Make traffic information center carry out distributed or parallel processing, and then the counting yield of traffic information center is significantly improved collected magnanimity traffic data.
Fig. 1 is the traffic information collection method flow diagram according to the embodiment of the invention.In this embodiment, traffic information acquisition system institute region covered is divided into a plurality of traffic zones based on longitude and latitude.Of Fig. 1, this flow process comprises the steps.
Step 101: the mobile unit in the detection vehicle is gathered traffic data.
Step 102: extract latitude and longitude coordinates in the traffic data that mobile unit is gathered from step 101, and confirm the traffic zone under this latitude and longitude coordinates, afterwards, this traffic data is associated with the traffic zone ID of determined traffic zone.
Wherein, the mobile unit longitude and latitude thresholding that can be used to delimit traffic zone according to preset one group is determined the traffic zone under this latitude and longitude coordinates.Such as: traffic information acquisition system institute region covered can be divided into four quadrants (quadrant 1, quadrant 2, quadrant 3, quadrant 4) by longitude and latitude; These four quadrants are similar to four quadrants in the two-dimensional coordinate system; Their respectively corresponding four traffic zones, the latitude and longitude coordinates that the common initial point of these four quadrants is corresponding (A, B) just can be used as be used to delimit traffic zone one group of longitude and latitude thresholding (wherein; A is the longitude thresholding, and B is the latitude thresholding); Suppose the latitude and longitude coordinates from traffic data, extracted for (X, Y), wherein, X is a longitude, Y is a latitude, then: 1) if X equals A greatly and Y equals B greatly, then (X Y) belongs to the corresponding traffic zone of quadrant 1 to latitude and longitude coordinates; 2) if X equals A and Y greatly less than B, then (X Y) belongs to the corresponding traffic zone of quadrant 2 to latitude and longitude coordinates; 3) if X equals B greatly less than A and Y, then (X Y) belongs to the corresponding traffic zone of quadrant 3 to latitude and longitude coordinates; 4) if X less than A and Y less than B, then (X Y) belongs to the corresponding traffic zone of quadrant 4 to latitude and longitude coordinates.
Step 103: this mobile unit transmits traffic data that collects and related traffic zone ID thereof through cordless communication network again to traffic information center.
Wherein, mobile unit increases the message unit (Information Unit) that is used to carry traffic zone ID at the communication information that is used for to traffic information center transmission traffic data.Suppose that traffic information acquisition system institute region covered is divided into four traffic zones; The message unit that then can in this communication information, increase dibit (2bits) carries traffic zone ID; At this moment; This communication information can comprise following message unit: vehicle ID, timestamp, GPS latitude and longitude coordinates, taxi state (as: take, empty wagons, wait ...), parameter (as: speed, the direction derived ...), sampling rate (as: indicate per 30 seconds gather a traffic data), quadrant information (2bits) or the like; Wherein, quadrant information is used to carry traffic zone ID.
Above-mentioned steps 101-103 is the processing to a traffic data, and in practical application, mobile unit can collect many parts of traffic datas by predetermined sampling rate, all can carry out the processing of above-mentioned steps 101-103 to each part traffic data of being gathered.
Step 104: through the processing of above-mentioned steps 101-103; Traffic information center receives the traffic zone ID of a large amount of traffic datas and each auto correlation thereof; Afterwards, traffic information center divides into groups to traffic data by traffic zone ID, is classified as one group with the traffic data that identical traffic zone ID is associated that is:; And each group traffic data is carried out traffic flow information respectively estimate, such as: estimate the interior Vehicle Speed of certain traffic zone, congestion etc.
Fig. 2 is the traffic information collection method flow diagram according to another embodiment of the present invention.In this embodiment, traffic information acquisition system institute region covered is divided into a plurality of traffic zones based on the cordless communication network cell covered.Of Fig. 2, this flow process comprises the steps.
Step 201: the mobile unit in the detection vehicle is gathered traffic data.
Step 202: mobile unit according to predefined from the sub-district to the traffic zone mapping relations and confirm the traffic zone at current place from the CELL ID that wireless network receives, again the traffic zone ID of current definite traffic zone and the traffic data of current collection are associated.
Concrete; Can be provided with mapping table in this mobile unit in advance from CELL ID to traffic zone ID; Utilize this mapping table, mobile unit can be determined the traffic zone ID of current place traffic zone fast according to its CELL ID that receives from cordless communication network.
Step 203: this mobile unit transmits traffic data that collects and related traffic zone ID thereof through cordless communication network again to traffic information center.The concrete realization and the abovementioned steps 103 of this step are similar, repeat no more here.
Step 204: through the processing of above-mentioned steps 201-203; Traffic information center receives the traffic zone ID of a large amount of traffic datas and each auto correlation thereof; Afterwards; Traffic information center divides into groups to traffic data by traffic zone ID, is classified as one group with the traffic data that identical traffic zone ID is associated that is:, and each group traffic data is carried out traffic flow information respectively estimate.
Above-mentioned steps 201-203 is the processing to a traffic data, and in practical application, mobile unit can collect many parts of traffic datas by predetermined sampling rate, all can carry out the processing of above-mentioned steps 201-203 to each part traffic data of being gathered.
The traffic information collection method that provides based on the invention described above embodiment; The embodiment of the invention also provides a kind of traffic information collecting apparatus; It is applied to traffic information acquisition system, and this traffic information acquisition system comprises: traffic information center, cordless communication network and a plurality of detection vehicle.This traffic information collecting apparatus is arranged in detection vehicle, is used to gather traffic data, through cordless communication network the traffic data that collects is sent to traffic information center; Further; This traffic information collecting apparatus is used for the traffic zone under definite this traffic data after gathering traffic data; Again this traffic data is associated with the information of traffic zone under it; And when transmitting traffic data, further transmit the information of the traffic zone that is associated with traffic data to traffic information center.This traffic information collecting apparatus can specifically be embodied as the mobile unit in the detection vehicle or be integrated in the mobile unit.This traffic information collecting apparatus can comprise: GPS module, wireless communication module and traffic zone relating module, wherein:
The GPS module is used to gather traffic data.
The traffic zone relating module is used to receive the traffic data from the GPS module, confirms the traffic zone under this traffic data, and this traffic data is associated with the information of traffic zone under it.
Wireless communication module is used for will sending to traffic information center from the information of the traffic data of traffic zone association module and related traffic zone thereof through cordless communication network.
In an embodiment of the present invention; The traffic zone relating module can be directed against each part traffic data that the GPS module collects; Confirm the traffic zone under the latitude and longitude coordinates in this part traffic data, and with the information of determined traffic zone therewith a part traffic data associate.Here; Based on longitude and latitude the traffic information acquisition system region covered is divided into a plurality of traffic zones in advance; That is: each traffic zone can be delimited by one group of longitude and latitude thresholding; Like this, the traffic zone relating module can be confirmed the traffic zone under the latitude and longitude coordinates of this part traffic data according to the longitude and latitude thresholding that is used for delimiting traffic zone.
In another embodiment of the present invention; The a traffic data that the traffic zone relating module collects to the GPS module at every turn; The traffic zone that can confirm current place according to predefined mapping relations and the current CELL ID that receives of wireless communication module from the sub-district to the traffic zone associates the information of current definite traffic zone and the traffic data of current collection again.Here, said mapping relations from the sub-district to the traffic zone can be implemented as the mapping table from CELL ID to traffic zone ID; Because when detection vehicle gets into a sub-district; Wireless communication module can be received the CELL ID that cordless communication network issues, and the traffic zone relating module in the embodiment of the invention can utilize this information of CELL ID that cordless communication network is handed down to wireless communication module to come the quick traffic zone of confirming current place.Here; Based on the cordless communication network cell covered traffic information acquisition system region covered is divided into a plurality of traffic zones in advance; Make a traffic zone comprise one or more sub-districts; And set up the mapping relations between a plurality of traffic zones and a plurality of sub-district, in these mapping relations, can confirm unique traffic zone according to a sub-district.
In embodiments of the present invention; The information of the traffic zone that the radio communication mold block transfer is associated with traffic data give traffic information center concrete grammar can for: in the communication information that transmits traffic data to traffic information center, increase new message unit, this new message unit is used to carry the information of traffic zone.In addition, wireless communication module can with initiatively or passive mode transmit traffic data and the information of the traffic zone that is associated with it to traffic information center.
Fig. 3 is the traffic information collecting apparatus synoptic diagram according to the embodiment of the invention.In this embodiment, traffic information acquisition system institute region covered is divided into a plurality of traffic zones based on longitude and latitude.As shown in Figure 3, this traffic information collecting apparatus comprises: GPS module 301, wireless communication module 302 and traffic zone relating module 303, wherein:
The traffic data that traffic zone relating module 303 receives from GPS module 301; From then on extract latitude and longitude coordinates in the traffic data; And confirm the traffic zone under this latitude and longitude coordinates, afterwards, this traffic data is associated with the traffic zone ID of traffic zone under it.Here, the traffic zone relating module 303 longitude and latitude thresholding that can be used to delimit traffic zone according to preset one group is determined the traffic zone under this latitude and longitude coordinates.
Fig. 4 is the traffic information collecting apparatus synoptic diagram according to another embodiment of the present invention.In this embodiment, traffic information acquisition system institute region covered is divided into a plurality of traffic zones based on the cordless communication network cell covered in advance.As shown in Figure 4, this traffic information collecting apparatus comprises: GPS module 401, wireless communication module 402 and traffic zone relating module 403, wherein:
The traffic data that traffic zone relating module 403 receives from GPS module 401, and from wireless communication module 402 reception CELL ID; According to this CELL ID and predefined ID confirms the traffic zone at current place to the mapping relations of traffic zone ID from the sub-district, again the traffic zone ID of the traffic zone at current place and the traffic data of GPS module 401 current collections are associated.Here; Traffic zone relating module 403 can be provided with the mapping table from CELL ID to traffic zone ID in advance; Utilize this mapping table, the CELL ID that traffic zone relating module 403 receives from cordless communication network according to wireless communication module 402 can determine the traffic zone ID of current place traffic zone fast.
On the basis of each embodiment of the invention described above, the preferred embodiments of the present invention have also proposed a kind of improvement project of traffic information collection method, with the running cost and the calculated load of further reduction traffic information center.In this traffic information collection method, mobile unit is gathered traffic data with variable sampling rate further, and it can upgrade sampling rate according to place traffic zone and/or the variation of time period of living in.
In a preferred embodiment of the invention, mobile unit upgrades sampling rate according to the variation of place traffic zone.The traffic information acquisition system region covered is divided into a plurality of traffic zones in advance; When detection vehicle went in the scope of a plurality of traffic zones of leap, the mobile unit in the detection vehicle detected the traffic zone at place; When detecting when getting into new traffic zone, mobile unit can be confirmed new sampling rate according to the rule of setting, and carries out traffic data collection with this new sampling rate then.
Concrete, the rule that sets can be the mapping relations of a plurality of traffic zones and a plurality of sampling rates, and mobile unit is detecting when getting into new traffic zone, can confirm the sampling rate of this new traffic zone correspondence according to these mapping relations; Optional; The rule that sets can also be for being used for the algorithm of calculating sampling rate; And the algorithm that is used for the calculating sampling rate to different traffic zones can be identical or different; Like this, mobile unit can calculate sampling rate according to the algorithm to this new traffic zone detecting when getting into new traffic zone.Here, the algorithm that is used for the calculating sampling rate can be relevant with travel speed/direction of the detected traffic zone of mobile unit, detection vehicle etc., is not content of the present invention about the concrete establishing method of this kind algorithm, do not do further detailed description here.
Adopt the foregoing description; Just can make mobile unit adopt different sampling rates at different traffic zones; Such as: the traffic zone complicated at road network adopts higher sampling rate; And adopt lower sampling rate at the simple relatively traffic zone of road network, and then significantly reduce redundant traffic data, and significantly reduce the running cost and the calculated load of the communications cost and the traffic information center of cordless communication network.
In another preferred embodiment of the present invention, mobile unit upgrades sampling rate according to the variation of time period of living in.At this moment, divide a plurality of time periods relevant in advance, such as dividing three time periods: low discharge period 22:00-7:00, high flow capacity period 7:00-9:00 and 17:00-19:00, normal discharge period 9:00-17:00 and 19:00-22:00 with the magnitude of traffic flow; When detect when being in the new time period (such as: enter into the high flow capacity period from the low discharge period), mobile unit can be confirmed new sampling rate according to the rule of setting, and carries out traffic data collection with this new sampling rate then.
Concrete, the rule that sets can be the mapping relations of a plurality of time periods and a plurality of sampling rates, and mobile unit is detecting when being in the new time period, can confirm the sampling rate of this correspondence of new time period according to these mapping relations; Optional; The rule that sets can be for being used for the algorithm of calculating sampling rate; And the algorithm that is used for the calculating sampling rate to different time sections can be identical or different; Like this, mobile unit is detecting when being in the new time period, can calculate sampling rate according to the algorithm to this new time period.Here, the algorithm that is used for the calculating sampling rate can be relevant with travel speed/direction of detected time period of mobile unit, detection vehicle etc., is not content of the present invention about the concrete establishing method of this kind algorithm, do not do further detailed description here.
Adopt the foregoing description; Just can make mobile unit adopt different sampling rates in the different time section; Such as: the traffic peak period at high flow capacity is adopted higher sampling rate; And adopt lower sampling rate in the relatively low period of flow, and then significantly reduce redundant traffic data, and significantly reduce the running cost and the calculated load of the communications cost and the traffic information center of cordless communication network.
In another preferred embodiment of the present invention, mobile unit upgrades sampling rate according to place traffic zone and the variation of time period of living in.At this moment, the traffic information acquisition system region covered is divided into a plurality of traffic zones in advance, and the division a plurality of time periods relevant with the magnitude of traffic flow; Mobile unit detected the traffic zone and the time period of living in thereof at place; When detecting when getting into new traffic zone; Mobile unit can be confirmed the new sampling rate that mobile unit should adopt in the current time period of living in this new traffic zone according to the rule of setting; Perhaps, when detecting when being in the new time period, mobile unit can be confirmed the mobile unit sampling rate that traffic zone should adopt at current place in this new time period according to the rule of setting.
Concrete; The rule that sets can be the mapping relations between a plurality of traffic zones, a plurality of time period and a plurality of sampling rate; Mobile unit is detecting when getting into new traffic zone; Can confirm the sampling rate of each time period that this new traffic zone is corresponding according to these mapping relations, and then confirm pairing sampling rate of time period current of living in to this new traffic zone; Optional; The rule that sets can be for being used for the algorithm of calculating sampling rate; And the algorithm that is used for the calculating sampling rate to different traffic zones and different time sections can be identical or different, and like this, mobile unit is detecting when getting into new traffic zone; Can calculate the sampling rate that mobile unit should adopt in the current time period of living in new traffic zone according to algorithm to this new traffic zone; Perhaps, mobile unit can calculate the sampling rate that mobile unit should adopt at current traffic zone of living in the new time period according to the algorithm to this new time period detecting when getting into the new time period.Here; The algorithm that is used for the calculating sampling rate can be relevant with travel speed/direction of the detected traffic zone of mobile unit, current time period of living in, detection vehicle etc.; Concrete establishing method about this kind algorithm is not a content of the present invention, does not do further detailed description here.
Adopt the foregoing description; Not only consider the influence of traffic zone to sampling rate; But also consider the influence of the time period relevant to sampling rate with the magnitude of traffic flow; Such as: adopt higher sampling rate and adopt lower sampling rate at the complicated traffic zone of road network at the simple relatively traffic zone of road network; The different periods in same traffic zone also can be adopted different sampling rates, and then make the sampling rate of mobile unit meet actual demand more, can further reduce redundant traffic data; And further reduce the running cost and the calculated load of the communications cost and the traffic information center of cordless communication network, further improve performance based on the traffic information acquisition system of FCD.
In the invention described above embodiment; Mobile unit with the traffic data of being gathered with it under the information of traffic zone when being associated; Can detect the traffic zone at its place, and the concrete grammar that mobile unit detects traffic zone repeats no more here at the existing detailed description of preamble.
In the invention described above embodiment; Be used for confirming that the rule of sampling rate can be handed down to mobile unit by traffic information center through cordless communication network when the mobile unit initialization; Also can be the Default Value of mobile unit; Further, this rule also can be dynamically updated through cordless communication network (like broadcast channel etc.) by traffic information center in the mobile unit operational process.
Fig. 5 is the traffic information collection method flow diagram according to the embodiment of the invention.In this embodiment, traffic information acquisition system institute region covered is divided into a plurality of traffic zones based on the cordless communication network cell covered, and wherein, each traffic zone comprises one or more sub-districts.As shown in Figure 5, this flow process comprises the steps:
Step 501: the mobile unit in the detection vehicle is gathered traffic data with a certain sampling rate.
Step 502: mobile unit detects whether to enter into new traffic zone, and when detecting when getting into new traffic zone, confirms the sampling rate of new traffic zone correspondence.
Concrete; Can be provided with mapping table in this mobile unit in advance from CELL ID to traffic zone ID; Utilize this mapping table; Mobile unit is found determined traffic zone ID when mobile unit and can be confirmed to enter into new traffic zone when changing according to the traffic zone ID that its CELL ID that receives from cordless communication network can confirm its current place traffic zone.
Concrete, above-mentioned mapping table can further comprise the mapping from traffic zone ID to sampling rate, like this, when detecting when getting into new traffic zone, utilizes this mapping table, can obtain sampling rate according to the traffic zone ID mapping of new traffic zone; Optional; Above-mentioned mapping table also can further comprise the mapping from traffic zone ID to the algorithm that is used for the calculating sampling rate; Like this, when detecting when getting into new traffic zone, utilize this mapping table; Can obtain an algorithm according to the traffic zone ID mapping of new traffic zone, can calculate sampling rate according to this algorithm.
Concrete; Aforementioned mapping from traffic zone ID to sampling rate can also be relevant with the time period; At this moment, comprise from traffic zone ID to each time period in the above-mentioned mapping table and the mapping each sampling rate, mobile unit is detecting when getting into new traffic zone; Can confirm the sampling rate of each time period that this new traffic zone is corresponding according to traffic zone ID, and then confirm the sampling rate that mobile unit should adopt in the current time period of living in this new traffic zone; The aforementioned algorithm that is used for the calculating sampling rate also can be relevant with the time period; Like this; Mobile unit is detecting when getting into new traffic zone; Can obtain the algorithm relevant according to traffic zone ID mapping, utilize this algorithm to calculate the sampling rate that mobile unit should adopt in the current time period of living in new traffic zone then with each time period.
Step 503: the sampling rate that mobile unit is confirmed with step 502 is gathered traffic data.
Above-mentioned steps 502-503 is mobile unit collection traffic data and the processing procedure of upgrading sampling rate, and parallel, mobile unit is also carried out following steps:
Step 504: each part traffic data that will collect is associated with corresponding traffic zone ID.The concrete realization such as the preceding step 202 of this step are said, repeat no more here.
Step 505: this mobile unit transmits traffic data that collects and related traffic zone ID thereof through cordless communication network again to traffic information center.The concrete realization and the abovementioned steps 103 of this step are similar, repeat no more here.
Step 506: through the processing of above-mentioned steps 501-505; Traffic information center receives the traffic zone ID of a large amount of traffic datas and each auto correlation thereof; Afterwards; Traffic information center divides into groups to traffic data by traffic zone ID, is classified as one group with the traffic data that identical traffic zone ID is associated that is:, and each group traffic data is carried out traffic flow information respectively estimate.
Adopt the foregoing description; Not only can improve the treatment effeciency of traffic information center; Can also significantly reduce the data volume that data that mobile unit need gather and transmit and traffic information center need be handled; And then significantly reducing the communications cost of cordless communication network, the running cost of traffic information center and calculated load also will further reduce.
Above Fig. 5 has only provided a kind of embodiment of the inventive method; Aforesaid various detection traffic zone and upgrade sampling rate method and with traffic data with its under the information of traffic zone be associated and the method that sends traffic information center to all can combination in any constitute various embodiment; Here detail no longer one by one, but all fall within protection scope of the present invention.
Accordingly; On the basis of aforementioned traffic information collecting apparatus; The embodiment of the invention also provides a kind of improved traffic information collecting apparatus, and it is applied to traffic information acquisition system, and this traffic information acquisition system comprises: traffic information center, cordless communication network and a plurality of detection vehicle; Said traffic information collecting apparatus is arranged in detection vehicle; Except realizing the function of aforementioned traffic information collecting apparatus, it also is used for gathering traffic data by sampling rate, and can upgrade sampling rate according to place traffic zone and/or the variation of time period of living in.This device can specifically be embodied as the mobile unit in the detection vehicle or be integrated in the mobile unit.This device further comprises the sampling rate update module with respect to aforementioned traffic information collecting apparatus, and promptly this device comprises: GPS module, wireless communication module, traffic zone relating module and sampling rate update module, wherein:
The GPS module is used for gathering traffic data with certain sampling rate.
The traffic zone relating module is used to receive the traffic data from the GPS module, confirms the traffic zone under this traffic data, and this traffic data is associated with the information of traffic zone under it.
Wireless communication module is used for will sending to traffic information center from the information of the traffic data of traffic zone association module and related traffic zone thereof through cordless communication network.
The sampling rate update module is used for upgrading the sampling rate of GPS module according to belonging to traffic zone and/or the variation of time period of living in.
In an embodiment of the present invention, the sampling rate update module is upgraded sampling rate according to the variation of place traffic zone.At this moment, can in advance the traffic information acquisition system region covered be divided into a plurality of traffic zones; When detection vehicle went in the scope of a plurality of traffic zones of leap, the sampling rate update module detected the traffic zone at place, perhaps received the traffic zone of the information of traffic zone with definite current place from the traffic zone relating module; When confirming to get into new traffic zone, the sampling rate update module can be confirmed the new sampling rate that the GPS module should adopt according to the rule of setting.
In another embodiment of the present invention, the sampling rate update module is upgraded sampling rate according to the variation of time period of living in.At this moment, can divide a plurality of time periods relevant in advance with the magnitude of traffic flow; When confirming to be in the new time period, the sampling rate update module can be confirmed the new sampling rate that the GPS module should adopt according to the rule of setting.
In further embodiment of this invention, the sampling rate update module is upgraded sampling rate according to place traffic zone and the variation of time period of living in.At this moment, can in advance the traffic information acquisition system region covered be divided into a plurality of traffic zones, and the division a plurality of time periods relevant with the magnitude of traffic flow.The sampling rate update module can detect the traffic zone and the time period of living in thereof at place; When detecting when getting into new traffic zone; The sampling rate update module can be confirmed the new sampling rate that the GPS module should adopt in the current time period of living in according to the rule of setting in new traffic zone; Perhaps, when detecting when being in the new time period, the sampling rate update module can be confirmed the GPS module sampling rate that traffic zone should adopt at current place in this new time period according to the rule of setting.The sampling rate update module also can be directly according to the traffic zone of confirming current place from the information of the traffic zone of traffic zone relating module; And detect the time period of living in; When confirming to get into new traffic zone; The sampling rate update module can be confirmed the new sampling rate that the GPS module should adopt in the current time period of living in according to the rule of setting in new traffic zone; Perhaps, when confirming to be in the new time period, the sampling rate update module can be confirmed the GPS module sampling rate that traffic zone should adopt at current place in this new time period according to the rule of setting.
Among above-mentioned each embodiment, the concrete grammar of confirming the new sampling rate that the GPS module should adopt according to the rule of setting repeats no more at the existing detailed description of preamble here.
In the invention described above embodiment, the concrete grammar that the sampling rate update module detects the place traffic zone is identical with the concrete grammar that the said traffic zone relating module of preamble detects affiliated traffic zone, repeats no more here.In the invention described above embodiment; Be used for confirming that the rule of sampling rate can be handed down to wireless communication module by traffic information center through cordless communication network when the traffic information collecting apparatus initialization; By wireless communication module this rule is sent to the sampling rate update module, this rule also can be the Default Value of sampling rate update module; Further; This rule also can be in the traffic information collecting apparatus operational process be dynamically updated by traffic information center broadcast channel through cordless communication network etc.; Wherein, Give wireless communication module through cordless communication network with the rule downloading that upgrades by traffic information center, and the rule of this renewal is sent to the sampling rate update module by wireless communication module.
About the realization principle of the information of the realization principle of traffic zone relating module and radio communication mold block transfer traffic data and affiliated traffic zone thereof, detail in that preamble is existing, repeat no more here.
Fig. 6 A is the traffic information collecting apparatus synoptic diagram according to one embodiment of the invention.In this embodiment, a plurality of sub-districts that traffic information acquisition system institute region covered covers based on cordless communication network and be divided into a plurality of traffic zones, wherein, each traffic zone comprises one or more sub-districts.Shown in Fig. 6 A, this traffic information collecting apparatus comprises: GPS module 601, wireless communication module 602, traffic zone relating module 603 and sampling rate update module 604, wherein:
The traffic data that traffic zone relating module 603 receives from GPS module 601; Receive CELL ID from wireless communication module 602; The traffic zone of confirming current place according to predefined mapping relations and CELLID from the sub-district to the traffic zone associates the traffic zone ID of current definite traffic zone and the traffic data of GPS module 601 current collections again.Here; Traffic zone relating module 603 can be provided with the mapping table from CELL ID to traffic zone ID in advance; Utilize this mapping table, the CELL ID that traffic zone relating module 603 receives from cordless communication network according to wireless communication module 602 can determine the traffic zone ID of current place traffic zone fast.
Sampling rate update module 604 detects whether enter into new traffic zone, detecting when getting into new traffic zone, confirms the sampling rate that new traffic zone is corresponding, and the sampling rate of GPS module 601 is updated to current determined sampling rate.
Concrete; Can be provided with mapping table in the sampling rate update module 604 in advance from CELL ID to traffic zone ID; Utilize this mapping table; The CELL ID that sampling rate update module 604 receives from cordless communication network according to wireless communication module 602 can confirm the traffic zone ID of current place traffic zone, finds determined traffic zone ID when sampling rate update module 203 and can confirm to enter into new traffic zone when changing.
Can further be provided with mapping in advance in the sampling rate update module 604, like this,, utilize this mapping table, can obtain sampling rate according to the traffic zone ID mapping of new traffic zone when detecting when getting into new traffic zone from traffic zone ID to sampling rate; Optional; Above-mentioned mapping table also can further comprise the mapping from traffic zone ID to the algorithm that is used for the calculating sampling rate; Like this, when sampling rate update module 604 detects when getting into new traffic zone, utilize this mapping table; Can obtain an algorithm according to the traffic zone ID mapping of new traffic zone, obtain the sampling rate that GPS module 601 adopts new traffic zone planted agent according to this algorithm computation again.
Optional; Aforementioned mapping from traffic zone ID to sampling rate can also be relevant with the time period; At this moment, comprise from traffic zone ID to each time period in the above-mentioned mapping table and the mapping each sampling rate, sampling rate update module 604 is detecting when getting into new traffic zone; Can confirm the sampling rate of each time period that this new traffic zone is corresponding according to traffic zone ID, and then confirm the sampling rate that GPS module 601 should adopt in the current time period of living in this new traffic zone; Optional; The aforementioned algorithm that is used for the calculating sampling rate also can be relevant with the time period; Like this; Sampling rate update module 604 can obtain the algorithm relevant with each time period according to traffic zone ID mapping detecting when getting into new traffic zone, utilizes this algorithm to calculate the sampling rate that GPS module 601 should adopt in the current time period of living in new traffic zone then.
Fig. 6 B is the traffic information collecting apparatus synoptic diagram according to another embodiment of the present invention.In this embodiment, a plurality of sub-districts that traffic information acquisition system institute region covered covers based on cordless communication network and be divided into a plurality of traffic zones, wherein, each traffic zone comprises one or more sub-districts.Shown in Fig. 6 B, this traffic information collecting apparatus comprises: GPS module 601, wireless communication module 602, traffic zone relating module 603 ' and sampling rate update module 604 ', wherein:
The traffic data that traffic zone relating module 603 ' receives from GPS module 601; Receive CELL ID from wireless communication module 602; The traffic zone of confirming current place according to predefined mapping relations and CELLID from the sub-district to the traffic zone; Again the traffic zone ID of current definite traffic zone and the traffic data of GPS module 601 current collections are associated, and send this traffic zone ID and give sampling rate update module 604 '.Here, traffic zone relating module 603 ' is adopted the traffic zone that uses the same method to confirm current place with the traffic zone relating module 603 among Fig. 6 A, repeats no more here.
Sampling rate update module 604 ' judges whether to get into new traffic zone according to the traffic zone ID from traffic zone relating module 603 '; When confirming to get into new traffic zone; And then confirm the sampling rate that new traffic zone is corresponding, and the sampling rate of GPS module 601 is updated to current determined sampling rate.Here, when sampling rate update module 604 ' found that traffic zone ID changes, the promptly current traffic zone ID that receives was different with the traffic zone ID that received last time, just can confirm to get into new traffic zone.The concrete grammar of the sampling rate that sampling rate update module 604 ' and sampling rate update module 604 among Fig. 6 A are used for confirming that new traffic zone is corresponding is identical, repeats no more here.
Above Fig. 6 A and Fig. 6 B have only provided two embodiment of apparatus of the present invention; The implementation of the implementation of aforesaid various traffic zone relating modules and aforesaid various sampling rate update module all can combination in any constitute various device embodiment; Here just detail no longer one by one, but all fall within protection scope of the present invention.
The device that the invention described above embodiment provided can be implemented as hardware unit, also can be a kind of virtual bench of realizing with software mode.
The embodiment of the invention also provides a kind of traffic information acquisition system, and it comprises: traffic information center, cordless communication network, a plurality of detection vehicle that is deployed with mobile unit; Wherein, the mobile unit in each detection vehicle is used to gather traffic data, and transmits the traffic data that collects through cordless communication network and give traffic information center.Further; Mobile unit is after gathering traffic data; Confirm the traffic zone under this traffic data, and this traffic data is associated with the information of traffic zone under it, in addition; Mobile unit also transmits the information of the traffic zone that is associated with traffic data transmitting traffic data in the traffic information center; Traffic information center divides into groups to the traffic data of being received according to the information of the traffic zone of being received, and each group traffic data is carried out traffic flow information respectively estimate.Optional, mobile unit also can be gathered traffic data by certain sampling rate, through cordless communication network the traffic data that collects is sent to traffic information center, and upgrades sampling rate according to place traffic zone and/or the variation of time period of living in.
Concrete, the mobile unit in the said system can be confirmed the traffic zone under the traffic data and this traffic data is associated with the information of traffic zone under it by the method that the aforementioned embodiment of the invention provided.
Concrete, the mobile unit in the said system can by method that the aforementioned embodiment of the invention provided with traffic data and the information of related traffic zone send traffic information center to.
Concrete, the mobile unit in the said system can upgrade sampling rate by the method that the aforementioned embodiment of the invention provided.
Concrete, the traffic information center in the said system can divide into groups and each group traffic data is carried out traffic flow information respectively estimate traffic data by coming by the method that the aforementioned embodiment of the invention provided.
Optional, the mobile unit in the said system can perhaps be built-in with this traffic information collecting apparatus for the traffic information collecting apparatus that the aforementioned embodiment of the invention provided.
Optional; Traffic information center in the said system can issue the rule that is used for definite sampling rate through cordless communication network and give mobile unit when the mobile unit initialization; Further, this rule also can be in the mobile unit operational process be dynamically updated by traffic information center broadcast channel through cordless communication network etc.
Fig. 7 is the traffic information acquisition system synoptic diagram according to the embodiment of the invention.As shown in Figure 7, this system comprises: traffic information center, cordless communication network, a plurality of detection vehicle of disposing mobile unit, as the detection vehicle among Fig. 71, detection vehicle 2 ..., detection vehicle n.Wherein:
Mobile unit in each detection vehicle is gathered traffic data and is sent to traffic information center through cordless communication network by certain sampling rate; Each mobile unit is after gathering traffic data; Confirm the traffic zone that this traffic data is affiliated; This traffic data is associated with the information of traffic zone under it, and when transmitting traffic data and giving traffic information center, transmits the information of the traffic zone that is associated with traffic data; Afterwards, traffic information center divides into groups to the traffic data of being received according to the information of the traffic zone of being received, and each group traffic data is carried out traffic flow information respectively estimate.Here; Detection vehicle 1 each mobile unit to the detection vehicle n can by the method that the aforementioned embodiment of the invention provided confirm under the traffic data traffic zone, the traffic data and the information of traffic zone under it are associated, transmit traffic data and related traffic zone thereof information to traffic information center, repeat no more here about concrete implementation method.
Optional, the mobile unit in each detection vehicle is gathered traffic data by certain sampling rate, and upgrades sampling rate according to place traffic zone and/or the variation of time period of living in.Here, detection vehicle 1 to each mobile unit among the detection vehicle n can upgrade sampling rate by the method that the aforementioned embodiment of the invention provided, and repeats no more here about the concrete grammar that upgrades sampling rate.
Issue through cordless communication network during the mobile unit initialization of traffic information center in each detection vehicle and be used for confirming that the rule of sampling rate gives mobile unit; Further, in these mobile unit operational processs, traffic information center also can dynamically update the rule that is used for confirming sampling rate in the mobile unit through cordless communication network (such as through broadcast channel etc.).Wherein, the traffic information collecting apparatus that mobile unit can provide for previous embodiment or be built-in with this traffic information collecting apparatus repeats no more about the concrete realization principle of this mobile unit here.
The traffic information collection method, the Apparatus and system that adopt the invention described above embodiment to be provided; Utilize the information of the traffic zone that the mobile unit in the detection vehicle uploads; Traffic information center can carry out distributed or parallel processing to collected magnanimity traffic data, and then the counting yield of traffic information center is significantly improved; Further; Through realizing variable sampling rate; The data that mobile unit need be gathered and transmit will significantly reduce, and therefore, the communications cost of cordless communication network will significantly reduce; Also will further significantly reduce the running cost and the calculated load of traffic information center simultaneously, and then significantly improve overall performance based on the traffic information acquisition system of FCD.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (17)
1. traffic information collection method, this method is applied to a kind of traffic information acquisition system, and said traffic information acquisition system comprises: traffic information center, cordless communication network and a plurality of detection vehicle that has mobile unit, said method comprises:
Said mobile unit is gathered traffic data, and transmits said traffic data through said cordless communication network and give said traffic information center;
It is characterized in that said method further comprises:
Said mobile unit is confirmed the traffic zone under the said traffic data after gathering said traffic data, and with said traffic data with its under the information of traffic zone be associated;
Said mobile unit transmits the information of the traffic zone that is associated with said traffic data and gives said traffic information center when transmitting said traffic data; And,
Said traffic information center divides into groups to the traffic data of being received, and each group traffic data is carried out traffic flow information respectively estimate; Wherein, belong to same group with the traffic data that the information of identical traffic zone is associated.
2. method according to claim 1 is characterized in that, based on longitude and latitude said traffic information acquisition system region covered is divided into a plurality of traffic zones in advance, and each traffic zone delimited by one group of longitude and latitude thresholding;
Said mobile unit is confirmed the traffic zone under the latitude and longitude coordinates in the said traffic data according to said longitude and latitude thresholding, and with the traffic zone identification associated of said traffic data and determined traffic zone.
3. method according to claim 1; It is characterized in that; The a plurality of sub-districts that cover based on said cordless communication network in advance are divided into a plurality of traffic zones with said traffic information acquisition system region covered; Wherein, a traffic zone comprises one or more sub-districts, and sets up the mapping of the sign from cell ID CELL ID to traffic zone;
The traffic zone sign of traffic zone under said mobile unit is confirmed according to the said mapping that identifies from CELL ID to traffic zone and from the CELL ID that said cordless communication network receives, and with said traffic data and determined traffic zone identification associated.
4. method according to claim 1 is characterized in that, in the communication information that transmits traffic data to said traffic information center, increases the message unit of the information that is used to carry traffic zone;
When said mobile unit transmits said traffic data at the said communication information of employing, the information of in said message unit, carrying the traffic zone that is associated with said traffic data.
5. method according to claim 1 is characterized in that, said mobile unit is gathered traffic data by sampling rate;
Said method further comprises: said mobile unit upgrades said sampling rate according to said detection vehicle place traffic zone and/or the variation of time period of living in.
6. method according to claim 5 is characterized in that, in advance said traffic information acquisition system region covered is divided into a plurality of traffic zones, and the division a plurality of time periods relevant with the magnitude of traffic flow;
Said mobile unit upgrades said sampling rate according to said detection vehicle place traffic zone and the variation of time period of living in, wherein:
When confirming to get into new traffic zone, said mobile unit is according in said new traffic zone, upgrading said sampling rate in the sampling rate of current time period setting of living in; Perhaps,
When confirming to be in the new time period, said mobile unit upgrades said sampling rate according to the sampling rate that traffic zone is set at current place in said new time period.
7. method according to claim 6; It is characterized in that; A plurality of traffic zones are divided with said traffic information acquisition system region covered in a plurality of sub-districts that cover based on said cordless communication network in advance; Wherein, a traffic zone comprises one or more sub-districts, and sets up the mapping of the sign from cell ID CELL ID to traffic zone;
The traffic zone sign of traffic zone under said mobile unit is confirmed according to the said mapping that identifies from CELL ID to traffic zone and from the CELL ID that said cordless communication network receives, and with said traffic data and determined traffic zone identification associated;
If the traffic zone of affiliated traffic zone sign changes, then confirm to get into new traffic zone.
8. according to claim 6 or 7 described methods; It is characterized in that; The sampling rate of said setting is the Default Value of said mobile unit, perhaps when said mobile unit initialization, is handed down to said mobile unit by said traffic information center through said cordless communication network; And/or,
In said mobile unit operational process, the sampling rate of said setting is dynamically updated through said cordless communication network by said traffic information center.
9. traffic information collecting apparatus; This device is applied to a kind of traffic information acquisition system; Said traffic information acquisition system comprises: traffic information center, cordless communication network and a plurality of detection vehicle is characterized in that said device is arranged in said detection vehicle; Said device comprises: global position system GPS module, wireless communication module and traffic zone relating module, wherein:
Said GPS module is used to gather traffic data;
Said traffic zone relating module is used to receive the traffic data from said GPS module, confirms the traffic zone under the said traffic data, and said traffic data is associated with the information of traffic zone under it;
Said wireless communication module is used for will sending to said traffic information center from the information of the traffic data of said traffic zone relating module and related traffic zone thereof through said cordless communication network.
10. device according to claim 9 is characterized in that, said device further comprises: the sampling rate update module:
Said GPS module is used for gathering traffic data by sampling rate;
Said sampling rate update module is used for upgrading according to said detection vehicle place traffic zone and/or the variation of time period of living in the sampling rate of said GPS module.
11. device according to claim 10 is characterized in that, said traffic information acquisition system region covered is divided into a plurality of traffic zones in advance, and has divided in advance a plurality of time periods relevant with the magnitude of traffic flow; Said sampling rate update module is used for upgrading according to said detection vehicle place traffic zone and the variation of time period of living in the sampling rate of said GPS module, wherein:
When confirm getting into new traffic zone, said sampling rate update module is upgraded the sampling rate of said GPS module according to the sampling rate of in said new traffic zone, setting in the current time period of living in; Perhaps,
When confirming to be in the new time period, said sampling rate update module is upgraded the sampling rate of said GPS module according to the sampling rate that traffic zone is set at current place in said new time period.
12. device according to claim 11; It is characterized in that; Said traffic information acquisition system region covered is divided into a plurality of traffic zones by a plurality of microzonations that cover based on said cordless communication network in advance; Wherein, a traffic zone comprises one or more sub-districts, and establishes the mapping of the sign from cell ID CELL ID to traffic zone;
Said sampling rate update module is confirmed the traffic zone sign of current place traffic zone according to the said CELL ID that mapping and the said wireless communication module of sign received from said cordless communication network from CELL ID to traffic zone; If determined traffic zone sign changes, then confirm to get into new traffic zone.
13. device according to claim 11 is characterized in that, the information of traffic zone was to confirm to get into new traffic zone under said sampling rate update module was obtained from said traffic zone relating module.
14., it is characterized in that said traffic information acquisition system region covered is divided into a plurality of traffic zones based on longitude and latitude in advance according to claim 9 or 13 described devices, each traffic zone delimited by one group of longitude and latitude thresholding;
Said traffic zone relating module is confirmed the traffic zone under the latitude and longitude coordinates in the said traffic data according to said longitude and latitude thresholding, and with the traffic zone identification associated of said traffic data and determined traffic zone.
15. according to claim 9 or 13 described devices; It is characterized in that; Said traffic information acquisition system region covered is divided into a plurality of traffic zones by a plurality of microzonations that cover based on said cordless communication network in advance; Wherein, a traffic zone comprises one or more sub-districts, and establishes the mapping of the sign from cell ID CELL ID to traffic zone;
The traffic zone sign of traffic zone under said traffic zone relating module is confirmed according to the said CELL ID that mapping and the said wireless communication module of sign received from said cordless communication network from CELL ID to traffic zone, and with said traffic data and determined traffic zone identification associated.
16. according to each described device of claim 11 to 13; It is characterized in that; The sampling rate of said setting is the Default Value of said sampling rate update module; Perhaps, when said traffic information collecting apparatus initialization, be handed down to said wireless communication module through said cordless communication network, and send to said sampling rate update module by said wireless communication module by said traffic information center; And/or,
In said traffic information collecting apparatus operational process; The sampling rate of said setting is dynamically updated by said traffic information center; Wherein, Said traffic information center is handed down to said wireless communication module through said cordless communication network with the sampling rate of upgrading, and sends to said sampling rate update module by said wireless communication module.
17. a traffic information acquisition system comprises: traffic information center, cordless communication network and a plurality of detection vehicle, it is characterized in that,
Said detection vehicle has according to each described device of claim 9 to 16;
Said traffic information center is used for the traffic data of being received is divided into groups, and each group traffic data is carried out traffic flow information respectively estimate; Wherein, belong to same group with the traffic data that the information of identical traffic zone is associated.
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| CN110140326A (en) * | 2017-12-08 | 2019-08-16 | 华为技术有限公司 | The method and apparatus that the performance data of equipment is sampled |
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