CN102314768A - Traffic information collecting method, device and system - Google Patents
Traffic information collecting method, device and system Download PDFInfo
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- CN102314768A CN102314768A CN2010102160948A CN201010216094A CN102314768A CN 102314768 A CN102314768 A CN 102314768A CN 2010102160948 A CN2010102160948 A CN 2010102160948A CN 201010216094 A CN201010216094 A CN 201010216094A CN 102314768 A CN102314768 A CN 102314768A
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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
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 floating car 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 floating car 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 continuous gather traffic data with specific sampling rate (Sampling Rate), 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 dynamic information of whole road network, as: 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, 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; Like this; Between traffic information center and each mobile unit, can be very big through the cordless communication network data quantity transmitted, this need take a large amount of wireless communication resources.In addition, traffic information center needs through complicated calculating such as utilization map match, traffic route suppositions behind the traffic data that receives from detection vehicle; These traffic datas finally are processed into the data message such as driving hourage in traffic information and the highway section of each bar road of city; Wherein, traffic information center will obtain the ride characteristic of each detection vehicle through map match, and then assembles the traffic flow information of the ride characteristic of all detection vehicles that obtained 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 calculated amount and just can be kept a qualified basically traffic flow information and estimate.
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, takies, reduces system operation cost and calculated amount with what reduce wireless communication resources.
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; Said method comprises: said mobile unit is gathered traffic data by sampling rate, and transmits said traffic data through said cordless communication network and give said traffic information center; 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.
The embodiment of the invention also provides a kind of 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, and said device is arranged in said detection vehicle; Said device comprises: global position system GPS module, wireless communication module and sampling rate update module, and wherein: said GPS module is used for gathering traffic data by sampling rate; Said wireless communication module is used for sending the traffic data that said GPS module collects to said traffic information center through said cordless communication network; And said sampling rate update module is used for confirming the sampling rate that said GPS module should adopt according to said detection vehicle place traffic zone and/or the variation of time period of living in, and upgrades the sampling rate of said GPS module.
The embodiment of the invention further provides a kind of traffic information acquisition system, and it comprises: traffic information center, cordless communication network, a plurality of detection vehicle that has above-mentioned traffic information collecting apparatus.
Method, the Apparatus and system that adopts the embodiment of the invention to provide can significantly reduce the traffic data amount that needs collection and transmission; And then; Significantly reduce the communications cost of cordless communication network, also will significantly reduce the running cost and the calculated load of traffic information center simultaneously.
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 the embodiment of the invention;
Fig. 2 is the traffic information collecting apparatus synoptic diagram according to the embodiment of the invention; And,
Fig. 3 is the traffic information acquisition system synoptic diagram according to the 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; Wherein, mobile unit is gathered traffic data with variable sampling rate, and it can upgrade sampling rate according to place traffic zone and/or the variation of time period of living in.
In an embodiment of the present invention, mobile unit upgrades sampling rate according to the variation of place traffic zone.At this moment, in advance the traffic information acquisition system region covered is divided into a plurality of traffic zones; 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 preset rule, carries out traffic data collection with this new sampling rate then.
Concrete, default rule 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; Default rule 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 design 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: 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; 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 an 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&17:00-19:00, normal discharge period 9:00-17:00&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 preset rule, carries out traffic data collection with this new sampling rate then.
Concrete, default rule 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; Default rule 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 design 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: adopt higher sampling rate and adopt lower sampling rate in the traffic peak period of high flow capacity 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 an 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, in advance the 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; 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 preset rule; 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 preset rule.
Concrete; Default rule 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; Default rule 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 can be identical or different; Like this, mobile unit can calculate the sampling rate that mobile unit should adopt in the current time period of living in new traffic zone 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, current time period of living in, detection vehicle etc.; Concrete establishing method about this kind algorithm is not a design 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 and of the influence of magnitude of traffic flow section correlation time sampling rate; Such as: adopt average higher sampling rate and adopt average lower sampling rate at the complicated traffic zone of road network at the simple relatively traffic zone of road network; Further 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 detect the place traffic zone concrete grammar 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 a series of longitude and latitude thresholdings; Mobile unit can be confirmed the traffic zone at current place according to the current latitude and longitude coordinates that collects.
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 traffic zone and the sub-district; In these mapping relations, can confirm unique traffic zone according to a sub-district; The traffic zone that mobile unit can be confirmed current place according to predefined mapping relations and the current sub-district ID that receives of mobile unit from the sub-district to the traffic zone.Here, said mapping relations from the sub-district to the traffic zone can be implemented as from the sub-district ID to the mapping table of traffic zone ID; Because mobile unit itself possesses radio communication function; It can receive the sub-district ID that cordless communication network issues when getting into a sub-district, the present invention utilizes this information of sub-district ID that cordless communication network is handed down to mobile unit to make mobile unit confirm the traffic zone at current place fast.
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. 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 the cordless communication network cell covered, and wherein, each traffic zone comprises one or more sub-districts.As shown in Figure 1, this flow process comprises the steps:
Step 101: the mobile unit in the detection vehicle detects whether enter into new traffic zone, and gathers traffic data with a certain sampling rate.
Step 102: when detecting when getting into new traffic zone, mobile unit is confirmed the sampling rate that new traffic zone is corresponding.
Concrete; Be provided with from the sub-district ID in this mobile unit in advance to the mapping table of 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 from the ID that the sub-district ID that cordless communication network receives can confirm its current place traffic zone according to it.
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 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 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 the time period.
Step 103: the sampling rate so that step 102 is confirmed is gathered traffic data.
The embodiment of the invention also provides a kind of traffic information collecting apparatus; 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, and this device is arranged in detection vehicle, is used for gathering traffic data by sampling rate; Through cordless communication network the traffic data that collects is sent to traffic information center, 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 can comprise: GPS module, wireless communication module and sampling rate update module, wherein:
The GPS module is used for gathering traffic data with certain sampling rate.
Wireless communication module is used for through cordless communication network the traffic data that the GPS module collects being sent to traffic information center.
The sampling rate update module is used for confirming the sampling rate that the GPS module should adopt according to place traffic zone and/or the variation of time period of living in, and upgrades the sampling rate of GPS module.
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, in advance the traffic information acquisition system region covered is 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; 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 according to preset rule.
Concrete, default rule can be the mapping relations of a plurality of traffic zones and a plurality of sampling rates, and the sampling rate update module 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; Default rule 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, the sampling rate update module can calculate sampling rate according to the algorithm to this new traffic zone detecting when getting into new traffic zone.
In an 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, divide a plurality of time periods relevant in advance with the magnitude of traffic flow; When detecting when being 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 preset rule.
Concrete, default rule can be the mapping relations of a plurality of time periods and a plurality of sampling rates, and the sampling rate update module 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; Default rule 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, the sampling rate update module is detecting when being in the new time period, can calculate sampling rate according to the algorithm to this new time period.
In an embodiment of the present 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, in advance the 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; The sampling rate update module detected 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 new traffic zone according to preset rule; 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 preset rule.
Concrete; Default rule 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; Default rule 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 can be identical or different; Like this, the sampling rate update module can calculate the sampling rate that the GPS module should adopt in the current time period of living in new traffic zone according to the algorithm to this new traffic zone detecting when getting into new traffic zone.
In the invention described above embodiment, the sampling rate update module detect the place traffic zone concrete grammar 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 a series of longitude and latitude thresholdings; The sampling rate update module can be confirmed the traffic zone at current place according to the current latitude and longitude coordinates that collects of GPS module.
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; Like this, in these mapping relations, can confirm unique traffic zone according to a sub-district; The traffic zone that the sampling rate update module can be confirmed current place according to predefined mapping relations and the current sub-district ID that receives of wireless communication module from the sub-district to the traffic zone.Here, said mapping relations from the sub-district to the traffic zone can be implemented as from the sub-district ID to the mapping table of traffic zone ID; Because traffic information collecting apparatus itself possesses wireless communication module; It can receive the sub-district ID that cordless communication network issues when getting into a sub-district, the present invention utilizes this information of sub-district ID that cordless communication network is handed down to wireless communication module to make the sampling rate update module confirm the traffic zone at current place fast.
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 traffic information collecting apparatus; 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, the rule of this renewal is sent to the sampling rate update module by wireless communication module.
Fig. 2 is the traffic information collecting apparatus synoptic diagram according to the 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.As shown in Figure 2, this traffic information collecting apparatus comprises: GPS module 201, wireless communication module 202 and sampling rate update module 203, wherein:
Sampling rate update module 203 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 201 is updated to current determined sampling rate.
Concrete; Be provided with from the sub-district ID in the sampling rate update module 203 in advance to the mapping table of traffic zone ID; Utilize this mapping table; Sampling rate update module 203, is found determined traffic zone ID when sampling rate update module 203 and can be confirmed to enter into new traffic zone when changing from the ID that the sub-district ID that cordless communication network receives can confirm current place traffic zone according to wireless communication module 202.
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 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 sampling rate update module 203 detects when getting into new traffic zone, utilize this mapping table; Can obtain an algorithm according to the ID mapping of new traffic zone, obtain the sampling rate that GPS module 201 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 203 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 201 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 203 is detecting when getting into new traffic zone, can obtain an algorithm relevant with the time period according to traffic zone ID mapping, utilizes this algorithm to calculate the sampling rate that GPS module 201 should adopt in the current time period of living in new traffic zone then.
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, Mobile unit in each detection vehicle is gathered traffic data by certain sampling rate; Through cordless communication network the traffic data that collects is sent to traffic information center, and upgrade 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 upgrade sampling rate 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 device for the device 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. 3 is the traffic information acquisition system synoptic diagram according to the embodiment of the invention.As shown in Figure 3, this system comprises: traffic information center, cordless communication network, a plurality of detection vehicle of disposing mobile unit, as the detection vehicle among Fig. 31, 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, and traffic information center is collected these traffic datas to obtain road traffic flow information.Mobile unit in each detection vehicle also 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; The data that mobile unit in the detection vehicle need be gathered and transmit will significantly reduce; Therefore; The communications cost of cordless communication network will significantly reduce, and also will significantly reduce the running cost and the calculated load of traffic information center simultaneously, and then significantly improve the 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 (15)
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 by sampling rate, 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 upgrades said sampling rate according to said detection vehicle place traffic zone and/or the variation of time period of living in.
2. method according to claim 1 is characterized in that, in advance said traffic information acquisition system region covered is divided into a plurality of traffic zones; Said mobile unit upgrades said sampling rate according to the variation of said detection vehicle place traffic zone, comprising:
When detecting when getting into new traffic zone, confirm the sampling rate that adopts said new traffic zone planted agent according to preset rule, and upgrade sampling rate.
3. method according to claim 1 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, comprising:
When detecting when getting into new traffic zone, confirm the sampling rate that in said new traffic zone, should adopt according to preset rule, and upgrade sampling rate in the current time period of living in; Perhaps,
When detecting when being in the new time period, confirm the sampling rate that traffic zone should adopt at current place in said new time period according to preset rule, and upgrade sampling rate.
4. method according to claim 1 is characterized in that, divides a plurality of time periods relevant with the magnitude of traffic flow in advance; Said mobile unit upgrades said sampling rate according to the variation of said detection vehicle time period of living in, comprising:
When detecting when being in the new time period, confirm the sampling rate that should adopt according to preset rule, and upgrade sampling rate in the said new time period.
5. according to claim 2 or 3 described methods; It is characterized in that; Said traffic information acquisition system region covered is divided into a plurality of traffic zones, comprises: a plurality of traffic zones are divided in a plurality of sub-districts based on said cordless communication network covers, wherein; A traffic zone comprises one or more sub-districts, and sets up the mapping of the sign ID from cell ID CELL ID to traffic zone; And,
Said detecting gets into new traffic zone, comprising: the traffic zone sign ID that obtains current place traffic zone according to the cell ID CELL ID mapping of receiving from said cordless communication network; If the traffic zone that mapping obtains sign ID changes, then confirm to get into new traffic zone.
6. method according to claim 5 is characterized in that, further comprises: set up the mapping from traffic zone sign ID to the rule that is used for definite sampling rate;
When confirm getting into new traffic zone, mapping obtains being used for confirming the rule of sampling rate according to said traffic zone sign ID, and confirms the sampling rate that should adopt according to the rule that mapping obtains.
7. according to each described method of claim 2 to 4; It is characterized in that; Said preset rule 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, said preset rule is dynamically updated through said cordless communication network by said traffic information center.
8. 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 sampling rate update module, wherein:
Said GPS module is used for gathering traffic data by sampling rate;
Said wireless communication module is used for sending the traffic data that said GPS module collects to said traffic information center through said cordless communication network; And,
Said sampling rate update module is used for confirming the sampling rate that said GPS module should adopt according to said detection vehicle place traffic zone and/or the variation of time period of living in, and upgrades the sampling rate of said GPS module.
9. device according to claim 8 is characterized in that, said traffic information acquisition system region covered is divided into a plurality of traffic zones;
Said sampling rate update module detects the traffic zone at place, when detecting when getting into new traffic zone, confirms the sampling rate that said GPS module should adopt at said new traffic zone according to preset rule.
10. device according to claim 8 is characterized in that, said traffic information acquisition system region covered is divided into a plurality of traffic zones, and marks off a plurality of time periods relevant with the magnitude of traffic flow;
Said sampling rate update module; Traffic zone and time period of living in thereof to the place are detected; When detecting when getting into new traffic zone, confirm the sampling rate that said GPS module should adopt in the current time period of living in said new traffic zone according to preset rule; Perhaps,
When detecting when being in the new time period, confirm the sampling rate that traffic zone should adopt at current place in said new time period according to preset rule.
11. device according to claim 8 is characterized in that, marks off a plurality of time periods relevant with the magnitude of traffic flow in advance;
Said sampling rate update module detected the time period of living in, when detecting when being in the new time period, confirmed the sampling rate that said GPS module should adopt in the said new time period according to preset rule.
12. according to claim 9 or 10 described devices; It is characterized in that; Said traffic information acquisition system region covered is divided into a plurality of traffic zones based on said cordless communication network cell covered, and wherein, a traffic zone comprises one or more sub-districts; Establish the mapping of the sign ID from cell ID CELL ID to traffic zone in the said sampling rate update module;
Said sampling rate update module, when the place traffic zone was detected, the cell ID CELL ID that receives from said cordless communication network according to said wireless communication module shone upon the traffic zone sign ID that obtains current place traffic zone; If the traffic zone that mapping obtains sign ID changes then confirms to get into new traffic zone.
13. device according to claim 12 is characterized in that, further establishes the mapping from traffic zone sign ID to the rule that is used for definite sampling rate in the said sampling rate update module;
Said sampling rate update module is when confirming to get into new traffic zone, and mapping obtains being used for confirming the rule of sampling rate according to said traffic zone sign ID, and confirms the sampling rate that said GPS module should adopt according to the rule that mapping obtains.
14. according to each described device of claim 9 to 11; It is characterized in that; Said preset rule is the Default Value of said traffic information collecting apparatus; Perhaps, when said traffic information collecting apparatus initialization, be handed down to said wireless communication module through said cordless communication network, send to said sampling rate update module by said wireless communication module again by said traffic information center; And/or,
In said traffic information collecting apparatus operational process; Said preset rule is dynamically updated by said traffic information center; Wherein, Said traffic information center is given said wireless communication module through said cordless communication network with the rule downloading that upgrades, and the rule of sending said renewal by said wireless communication module is again given said sampling rate update module.
15. a traffic information acquisition system comprises: traffic information center, cordless communication network, a plurality of detection vehicle that has like each described traffic information collecting apparatus of claim 8 to 14.
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