CN102446416B - Traffic notification system for reducing communication demand and method thereof - Google Patents
Traffic notification system for reducing communication demand and method thereof Download PDFInfo
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Abstract
The invention relates to a traffic notification system for reducing a communication demand and a method thereof. According to an embodiment of the traffic notification system for reducing a communication demand, each probe vehicle of at least one speed probe vehicle device like a probe vehicle is communicatively coupled to a dynamic traffic service management center; the dynamic traffic service management center periodically broadcasts a high speed in a period collected during the last period as well as irregularly broadcasts an instant high speed which is reported back in a current period; after at least one probe vehicle receives the speed broadcasted by the dynamic traffic service management center, a corresponding instant high speed in the current period is selectively reported to the dynamic traffic service management center.
Description
Technical field
The disclosure relates to a kind of traffic circular (traffic notification) System and method for that reduces communication requirement.
Background technology
Instant transport information, the information such as such as road conditions, the speed of a motor vehicle, vehicle flowrate, are the important rings of Intelligent Transportation System, can provide by the instant transport information of passerby to save running time and energy resource consumption.Take this type of information as basis, value added service dealer can provide the services such as automobile navigation, fleet send, traffic control.The basis of this type of traffic-information service is the collection of instant transport information (as road traffic and the speed of a motor vehicle).Instant transport information collection mode comprises and fixed wagon detector is set, utilizes radio telecommunication network to follow the trail of user's mobile phone location and be equipped with GPS (Global Positioning System, GPS) detective's car (probe vehicle) return transport information.
Fixed wagon detector mode is set and normally at Important Sections, fixed vehicle detection apparatus is set, detect vehicle flowrate and the speed of a motor vehicle in this section; These devices set up and safeguard the expense that common needs are huge.Utilize radio telecommunication network tracking user mobile phone location to estimate the mode of traffic, if cellie takes in the vehicle travelling always, or may there are many travels under consolidated network region, according to data in mobile phone, filter out effective traffic information in the case limited often.
In the mechanism of existing detective's car return (notify) transport information, as shown in the example of Fig. 1, having a kind of is that whole detective's cars 111～113 is periodically returned the instant speed of a motor vehicle to traffic information center 120, with circle internal label 1, represents.By traffic information center 120, broadcast real-time road condition again, with circle internal label 2, represent.The length that detective's car is returned the cycle of instant speed information can affect reported information whether overload (overload).In the case of the quantity of detective's car is enough, this mode need spend a large amount of information return cost and collect real-time road condition.
Another kind is to utilize the period of traffic and/or the association in section to carry out reported information, for example, in one piece of patent documentation, a kind of traffic reporting chain is disclosed, it has between at least one detective's car of GPS and traffic information center is to adopt two-way return method, and broadcast current road conditions by traffic information center, be divided into unimpeded, half congested, congested totally three kinds of road conditions.This at least one detective's car, in each section of journey (trip), is set up the historical data of the traffic of this section of journey.This at least one detective's car is more compared the historical record of identical period in historical data therewith of the current speed of a motor vehicle, if any the real-time road condition that does not meet traffic information center and broadcast, to traffic information center, returns current road conditions.
Fig. 2 is the example schematic that detective's car is set up the historical data of traffic.First, one section during the journey, periodically determine the current position (current position) of this detective's car and current traffic, as shown in step 210.Then, check the corresponding historical record that whether has current position, as shown in step 220.Some words, are embedded in current traffic in the database of historical record of current position, as shown in step 240.It's not true, checks whether set up new historical record instruction (step 230), is carry out step 240; Otherwise, return to step 210.
Fig. 3 is an example table of the two-way return method of GPS detective's car and traffic information center.Wherein, in the database of the historical record of current position, there are 6 records, for example, in the 2nd record, when the current speed of a motor vehicle of detective's car is 31 (miles/hour), and corresponding historical record is 41 (miles/hour), and the car of scouting is returned to traffic information center, traffic information center is returned according to this, sends the warning of " half is congested ".In the 3rd record, when the current speed of a motor vehicle of detective's car is 16 (miles/hour), and the record of corresponding averaged historical is 39 (miles/hour), and the car of scouting is returned to traffic information center, traffic information center is returned according to this, sends the warning of " congested ".Until in the 5th record, when the current speed of a motor vehicle of detective's car is 38 (miles/hour), and the record of corresponding averaged historical is 39 (miles/hour), and the car of scouting is returned to traffic information center, traffic information center is returned according to this, removes warning.In the 6th record, when the current speed of a motor vehicle of detective's car is 51 (miles/hour), and the record of corresponding averaged historical is 41 (miles/hour), and the car of scouting is returned to traffic information center, traffic information center is returned according to this, sends the warning of " unimpeded ".Send return threshold value (reporting threshold) that the warning of " half is congested ", " congested " and " unimpeded " adopts be respectively-10 (miles/hour) ,-20 (miles/hour) and+10 (miles/hour).But, according to the expectation value of the traffic information in historical period and/or section, can reflect actual traffic information limited often.
About the known references that instantaneous velocity information is provided, for example there are patent documentation US5539645, US6594576, US6574548 etc., what instant traffic was provided for example has patent documentation US6438561, US6594576, US7460948, a US6574548 etc., provide reduce return number of times for example have patent documentation US5539645, a US7460948 etc., what solve detective's car data deficiency for example has patent documentation US7555381, a US20080312811 etc.
Summary of the invention
Enforcement example of the present disclosure can provide a kind of traffic reporting chain and method that reduces communication requirement.
In an enforcement example, disclosed person is the traffic reporting chain that reduces communication requirement about a kind of.This system comprises a dynamic traffic service administrative center (Dynamic Traffic Service Management Center) and at least one detective's car.Each detective's car of this at least one detective's car (probe vehicle) communicates to connect to (communicatively coupled to) this dynamic traffic service administrative center.This dynamic traffic service administrative center periodically broadcasts a top speed of the upper cycle collection in a cycle, and irregularly broadcasts at least one instant top speed of return in the current cycle.This at least one detective's car is received after the speed of this dynamic traffic service administrative center broadcast, optionally returns within this current cycle, and its corresponding instant top speed is to this dynamic traffic service administrative center.
At another, implement in example, disclosed person is the traffic report method that reduces communication requirement about a kind of, is applied to a traffic reporting chain, and this system has a dynamic traffic service administrative center and center to center communications connects therewith at least one detective's car.The method comprises: by this dynamic traffic service administrative center, periodically broadcast a top speed of the upper cycle collection in a cycle, and irregularly broadcast at least one instant top speed of return in the current cycle; And according to each detective's car of the speed of this dynamic traffic service administrative center broadcast and this at least one detective's car corresponding instant top speed within this current cycle itself, this at least one detective's car determines that the corresponding instant top speed of whether return itself is to this dynamic traffic service administrative center.
Coordinate now following diagram, implement detailed description and the claim of example, by address other objects and advantages of the present invention and be specified in after.
Accompanying drawing explanation
Fig. 1 is an example schematic, and the mechanism of known a kind of car return transport information of scouting is described.
Fig. 2 is an example schematic, illustrates how known a kind of car of scouting sets up the historical data of traffic.
Fig. 3 is an example table, and known a kind of GPS detective's car and the two-way return method of traffic information center are described.
Fig. 4 A is an a kind of example schematic of the traffic reporting chain that reduces communication requirement, consistent with disclosed some enforcement example.
Fig. 4 B is an example schematic of detective's car of traffic reporting chain and the two-way return of traffic information center, consistent with disclosed some enforcement example.
Fig. 5 is an example schematic, illustrates that dynamic traffic service administrative center receives the flow process that the speed of a motor vehicle is scouted after the car return speed of a motor vehicle faster, with disclosed some to implement example consistent.
Fig. 6 sets timer T
can example schematic, with disclosed some implement example consistent.
Fig. 7 is an exemplary flowchart, and the V of detective's car is described
cmaxtreatment scheme when value increases is consistent with disclosed some enforcement example.
Fig. 8 is an example schematic of setting timer Tm-tmp, consistent with disclosed some enforcement example.
Fig. 9 is the example situation of detective's car return Vcmax, and wherein Vcmax >=β Vm-tmp is consistent with disclosed some enforcement example.
Figure 10 is an a kind of example schematic of the traffic report method that reduces communication requirement, consistent with disclosed some enforcement example.
Figure 11 is the example of the periodicity return of known technology and a comparison diagram of both return number of times of enforcement example of the present disclosure.
[main element symbol description]
111～113 detective's car 120 traffic information centers
210 periodically determine the current position and current traffic of detective's car
220 check the corresponding historical record that whether has current position
230 check whether set up new historical record instruction
240 are embedded in current traffic in the database of historical record of current position
400 traffic reporting chain 410 dynamic traffic service administrative centers
420 current cycles of at least one detective's car T
The top speed that Vmax dynamic traffic service administrative center collected in a upper cycle
The instant top speed of the current period T of Vm-tmp
451 detective's cars 1 are returned the instant top speed in current period T
510 check whether this cycle receives detective's car return speed of a motor vehicle for the first time
520 set the instant top speed Vm-tmp of the current period T speed of a motor vehicle of car return of for this reason scouting, and broadcast Vm-tmp
Do 530 check that the speed of the car return of scouting has the Vm-tmp of being greater than?
T
cdetective's car return V
cmaxmeter α timer T
csetup parameter time device
The Cycle Length of T broadcast Vmax
The top speed of Vmax dynamic traffic service administrative center within the cycle at present
The instant top speed of Vcmax detective car within the cycle at present
710 check that whether receiving 720 adjusts timer T
cvm-tmp
When Tm-tmp detective car accelerates, the timer of return Vcmax
730 check whether Vcmax is greater than Vm-tmp
740 set timer Tm-tmp
The time of the current end cycle of t_end
The time that t_recv detective car is received Vm-tmp
During 910Vcmax >=β V1, return this Vcmax
During 920Vcmax >=β V2, return this Vcmax
The timer of Tc detective car return Vcmax
Tm-tmp, when detective's car accelerates, returns the timer of Vcmax
The t_begin initial time in current cycle
The time of the current end cycle of t_end
The time of the predetermined return of t_report detective car Vcmax
The time that t_recv detective car is received Vm-tmp
The setup parameter of β timer Tm-tmp
1010 by dynamic traffic service administrative center, periodically broadcasts a top speed of the upper cycle collection in a cycle, and irregularly broadcasts at least one instant top speed of return in the current cycle
Each detective's car itself corresponding instant top speed within this current cycle of 1020 speed of broadcasting according to dynamic traffic service administrative center 0 and at least one detective's car, at least one detective's car determines that the corresponding instant top speed of whether return itself is to dynamic traffic service administrative center
Embodiment
Enforcement example of the present disclosure proposes the two-way return technology of at least one detective's car and a dynamic traffic service administrative center.Dynamic traffic service administrative center periodically broadcasts the instant max. speed in each section by wireless network thus, and first return the instant speed of a motor vehicle to dynamic traffic service administrative center by the speed of a motor vehicle car of scouting faster, then by the fastest speed of a motor vehicle of dynamic traffic service administrative center broadcast (broadcast) return.The slower detective's car of other speed of a motor vehicle is no longer returned the speed of a motor vehicle, reduces the quantity of detective's car information return, and alleviates the load of dynamic traffic service administrative center.
Fig. 4 A is an a kind of example schematic of the traffic reporting chain that reduces communication requirement, consistent with disclosed some enforcement example.Fig. 4 B is an example schematic of detective's car of this traffic reporting chain and the two-way return of dynamic traffic service administrative center, consistent with disclosed some enforcement example.Below illustrate please also refer to Fig. 4 A and Fig. 4 B.
In the example of Fig. 4 A, traffic reporting chain 400 can comprise a dynamic traffic service administrative center 410 and at least one detective's car 420, and the car 1 of for example scouting is to detective's car n, n >=1.Each detective's car of at least one detective's car communicates to connect to dynamic traffic service administrative center 410.At least one detective's car 420 can be equipped with as GPS device and have wireless transmission capability, for example, as shown in label 430.Between at least one detective's car 420 of traffic reporting chain 400 and dynamic traffic service administrative center 410, be to adopt two-way return method, with the example of Fig. 4 B, illustrate.
In the example of Fig. 4 A and Fig. 4 B, dynamic traffic service administrative center 410 periodically broadcasts a top speed Vmax of the upper cycle collection of a current period T, and irregularly broadcasts at least one instant top speed Vm-tmp of return in this current period T.And at least one detective's car 420 is received after the speed that dynamic traffic service administrative center 410 broadcasts, selectivity is returned instant top speed Vcmax in this current period T to dynamic traffic service administrative center 410, for example, in the example of Fig. 4 A, in at least one detective's car 420, as shown in label 451, only have detective's car 1 to return an instant top speed in current period T to dynamic traffic service administrative center 410.
In the example of Fig. 4 A and Fig. 4 B, for example, the cycle that dynamic traffic service administrative center 410 broadcasts top speed Vmax is T, can utilize a timer T
bcontrol; As timer T
bduring termination, the top speed Vmax that dynamic traffic service administrative center collected in 410 upper cycles of broadcast, lays equal stress on and establishes timer T
blength is T.So, at least one detective's car 420 can be received top speed Vmax, and optionally returns the corresponding instant top speed Vcmax of this car within this cycle to dynamic traffic service administrative center 410.
In other words, at least one detective's car 420, by the speed of a motor vehicle car of scouting faster, first return instant max. speed to dynamic traffic service administrative center 410, then by dynamic traffic service administrative center 410 broadcast the fastest speed of a motor vehicle in requitable instant max. speed.The slower detective's car of other speed of a motor vehicle is no longer returned the speed of a motor vehicle.So, can reduce the number of times of detective's car information return, also can alleviate the load of dynamic traffic service administrative center 410.
Dynamic traffic service administrative center receives that flow process that the speed of a motor vehicle scouts after the car return speed of a motor vehicle is faster as shown in the example of Fig. 5, and dynamic traffic service administrative center 410 is in timer T
bbefore termination, first check whether this cycle receives detective's car return speed of a motor vehicle (step 510) for the first time.To set instant top speed Vm-tmp in the current period T speed of a motor vehicle of car return of for this reason scouting, and broadcast Vm-tmp (step 520).Vm-tmp is instant Vmax, that is the top speed in current cycle.After this, dynamic traffic service administrative center 410 is greater than Vm-tmp person if any the speed of a motor vehicle that receives again the return of detective's car, upgrades Vm-tmp, and broadcasts Vm-tmp.That is to say, after this, dynamic traffic service administrative center 410 checks that the speed of the car return of whether scouting has the Vm-tmp of being greater than (step 530) person, is carry out step 520.
And detective's car is returned the action that will carry out or process during the speed of a motor vehicle, can illustrate according to following five kinds of events: (1) receives Vmax, (2) receive Vm-tmp, (3) when Vcmax increases, (4) enter new section, (5) have arrived the return time.
When detective's car is received Vmax, (event (1) occurs), this detective's car records the time of receiving Vmax, is designated as t_begin.Make t_current represent the current time, Vcmax represents the maximal rate of this detective's car between t_begin and t_current.This detective's car is set the timer T of return Vcmax
clength is [(α Vmax-Vcmax)/(α Vmax)] × T, and α is timer T
csetup parameter, α > 1.And, as the setting timer T of Fig. 6
cexample figure shown in, when Vcmax>=α Vmax, set timer T
clength is 0; When Vcmax=0, set the timer T of return Vcmax
clength is T, and wherein, transverse axis represents Vcmax value, and the longitudinal axis represents T
clength.As can be seen from Figure 6, when Vcmax value is larger, T
clength is shorter.That is to say, detective's car is set timer T
clength control when return Vcmax.And in conjunction with setup parameter α, allow the faster detective Che Nengyue of the speed of a motor vehicle early return its vehicle velocity V cmax to dynamic traffic service administrative center 410.
The default return time t_report of this detective's car is t_begin+T
cwith t_current this both maximal values, i.e. max{t_begin+T
c, t_current}.So, can allow the faster detective Che Nengyue of the speed of a motor vehicle early return its speed of a motor vehicle to dynamic traffic service administrative center 410, namely the speed of a motor vehicle car of scouting is faster set shorter timer T
clength, allows the slower detective Che Nengyue of other speed of a motor vehicle early know and no longer returns the speed of a motor vehicle, and reduce the number of times of detective's car return dynamic traffic service administrative center 410.
When detective's car is received Vm-tmp, (event (2) occurs), this detective's car is set as infinity by return time t_report, namely by timer T
cremove.So, can prevent slower detective's car (T
clonger) return, use the number of times that reduces detective's car return dynamic traffic service administrative center 410.
When the Vcmax value of detective's car increases (event (3) occurs), this detective's car was divided into different situation processing according to whether receiving Vm-tmp, as shown in the example flow process of Fig. 7, with disclosed some to implement example consistent.In the example of Fig. 7, this detective's car first checks whether received Vm-tmp (step 710).Words that no, this detective's car is adjusted timer T
c(step 720).Be, this detective's car test is looked into Vcmax and whether is greater than Vm-tmp (step 730), is, this detective's car is set timer Tm-tmp (step 740), when wherein timer Tm-tmp accelerates for detective's car, and the timer of return Vcmax.Adjust timer T
ccan react the change of the speed of a motor vehicle of detective's car, use the time that shortens the return of detective's car, detective's car is by timer T
cthe time that resets return Vcmax, its setting means is identical with the setting means of generation event (1), no longer repeats.Below further illustrate detective's car and received after Vm-tmp, how to set timer Tm-tmp.
Detective's car received after Vm-tmp, relatively Vcmax and Vm-tmp, if Vcmax is greater than Vm-tmp, the time t_end that detective's car is set this end cycle is t_begin+T, the namely timer T of dynamic traffic service administrative center 410
bthe time stopping, and detective's car record receives that the time of Vm-tmp is t_recv.Meanwhile, as shown in the example figure of the setting timer Tm-tmp of Fig. 8, detective's car by the length setting of timer Tm-tmp is
{[(βVm-tmp-Vcmax)]/[(β-1)×Vm-tmp]}×(t_end-t_current)，
Wherein, β is the setup parameter of timer Tm-tmp, β > 1.And when Vcmax>=β Vm-tmp, setting timer Tm-tmp length is 0; When Vcmax=Vm-tmp, set the timer T of return Vcmax
clength is t_end-t_recv, and wherein, transverse axis represents Vcmax value, and the longitudinal axis represents Tm-tmp length.
As can be seen from Figure 8, the principle of setting timer Tm-tmp is to allow the larger detective's car of acceleration (Vcmax-Vm-tmp) have shorter Tm-tmp.Detective's car is preset as t_recv+Tm-tmp and this both maximal value of t_current, i.e. max{t_recv+Tm-tmp, t_current} by return time t_report.Therefore accelerate (Vcmax-Vm-tmp) larger detective's car and can first return Vcmax to dynamic traffic service administrative center 410, so can prevent than Vcmax also slow detective's car when accelerating, return continually, thereby lower the number of times of detective's car return speed of a motor vehicle to dynamic traffic service administrative center 410.
Fig. 9 is the example situation of detective's car return Vcmax, wherein Vcmax >=β Vm-tmp, it is the situation that timer Tm-tmp length is 0, that is to say, as long as during instant maximal rate Vcmax >=β Vm-tmp of detective's car, this detective's car is returned Vcmax immediately to dynamic traffic service administrative center 410.In the example situation of Fig. 9, a side of detective's car, when detective's car was received for the first time after Vm-tmp (supposing to equal speed V1), as Vcmax is greater than the words of V1, the time t_end that detective's car is set this end cycle is t_begin+T, and record receives that the time of Vm-tmp is t_recv.Set timer Tm-tmp simultaneously, when Vcmax value increases, and during this Vcmax >=β V1, immediately return this Vcmax to dynamic traffic service administrative center 410, as shown in dotted arrow 910.When detective's car was received for the second time after Vm-tmp (supposing to equal speed V2), as Vcmax is greater than V2, detective's car record receives that the time of Vm-tmp is t_recv, sets timer Tm-tmp simultaneously.When Vcmax value continues to increase, and during this Vcmax >=β V2, immediately return this Vcmax to dynamic traffic service administrative center 410, as shown in dotted arrow 920.When detective's car, received for the third time after Vm-tmp (supposing to equal speed V3), if Vcmax is value≤V3,, when the time of this end cycle t_end (being another t_begin), dynamic traffic service administrative center 410 broadcasts Vmax.
When entering new section, detective's car (there is event (4)), the processing mode of (event (3) occurs) when this detective's car follows Vcmax to increase, that is according to the example flow process of earlier figures 7 and the explanation of Fig. 8 and Fig. 9, no longer repeat.Detective's car hypothesis in enforcement example of the present disclosure still can be received the broadcast message of approach way, and so, the detective's car that enters new section can, according to previous mode processing, also can be simplified the complexity of processing mode.And be not only applicable to the travelling in long-range section, be applicable to the travelling in short distance section yet.
When detective's car to return dynamic traffic service administrative center 410 time time (there is event (5)), namely timer T
cor Tm-tmp is when stop, this detective's car return Vcmax give return dynamic traffic service administrative center 410.
Accept above-mentionedly, the example schematic of Figure 10 can be described the How It Works of traffic reporting chain 400, with disclosed some to implement example consistent.In the example of Figure 10, this How It Works can comprise: by dynamic traffic service administrative center 410, periodically broadcast a top speed of the upper cycle collection in a cycle, and irregularly broadcast at least one instant top speed (step 1010) of return in the current cycle; And each detective's car own corresponding instant top speed within this current cycle of the speed of broadcasting according to dynamic traffic service administrative center 410 and at least one detective's car 420, at least one detective's car 420 determines whether to return corresponding instant top speed own to dynamic traffic service administrative center 410.
The flow process that the speed of a motor vehicle is scouted after the car return speed of a motor vehicle is faster received by dynamic traffic service administrative center, and detective's car is received Vmax to (1), (2) receive Vm-tmp, (3) when Vcmax increases, (4) enter new section, (5) arrived the processing and the time point of setting return of five kinds of events of return time, no longer repeated.
In the disclosure, simulation one environment is also tested being wherein set as follows of this environment: three kinds of different vehicle flowrates are respectively 500,1000,2000/hour; Detective's car accounts for 60% of total vehicle flowrate; And a long-distance road that has three tracks is divided into 6 sections.Under different vehicle flowrates, with the periodicity return of known technology and enforcement example of the present disclosure, return the comparison of number of times.The simulated time of 700 seconds and 730 seconds is respectively carried out in each section, and six section timing statisticses are spent 300 seconds (five minutes) altogether.Figure 11 is the example of a comparison diagram of the periodicity return of known technology and the return number of times of enforcement example of the present disclosure, and wherein the cycle of known technology is 30 seconds.In Figure 11, transverse axis represents vehicle flowrate (unit :/hour), and the longitudinal axis represents Total Return number of times.
From experimental result, can learn, enforcement example of the present disclosure can draw instant road information (Vmax), and its result and periodically return (cycle is a second) are identical.And from the comparison diagram of Figure 11, can find out and utilize aobvious the landing of enforcement example of the present disclosure to reduce the return number of times of detective's car, therefore can reduce communication requirement, and can alleviate the load of dynamic traffic service administrative center.
In sum, enforcement example of the present disclosure can provide a kind of instant high speed per hour of detective's car return of utilizing so that traffic reporting chain and the method for instant transport information to be provided.This technology is collected the instant high-speed of detective's car return by a dynamic traffic service administrative center, and the top speed Vmax that on periodic broadcast, a cycle collects, and irregularly broadcasts the top speed Vm-tmp in current cycle.And the broadcast cycle, Vmax and the Vm-tmp that utilize a group detective car to broadcast according to dynamic traffic service administrative center, and the instant max. speed of itself, determine whether return the instant speed of a motor vehicle to dynamic traffic service administrative center, and set the time point of return.Wherein the speed of a motor vehicle car of scouting faster can be set Zao return time point than the slower detective's car of the speed of a motor vehicle.When detective's car is learnt the return of higher speed, just no longer return.The number of times that so can reduce detective's car return speed of a motor vehicle, therefore can reduce communication requirement, and can alleviate the load of dynamic traffic service administrative center.Also long-range or the excursion time in car return section are applicable to scout.Above-mentioned detective's car is only the common name of an installation detecting vehicle speed device, is not limited to any form.The highest or the fastest speed of a motor vehicle of its what is called also can consider according to traffic safety, adds a positive and negative adjusted value or establishes a threshold value but not get actual measurement to the maximal value to sequence.
As described above is only enforcement example of the present disclosure, when not limiting according to this scope of disclosure enforcement.The equalization of generally doing according to disclosure application claims changes and modifies, and all should still belong to the scope that disclosure claims are contained.
Claims (19)
1. a traffic reporting chain that reduces communication requirement, this system comprises:
One dynamic traffic service administrative center; And
At least one detective's car, each detective's car of this at least one detective's car communicates to connect to this dynamic traffic service administrative center;
Wherein, this dynamic traffic service administrative center periodically broadcasts a top speed of the upper cycle collection in a cycle, and irregularly broadcast at least one instant top speed of return in the current cycle, this at least one detective's car is received after the speed of this dynamic traffic service administrative center broadcast, optionally return within this current cycle, its this corresponding instant top speed is given this dynamic traffic service administrative center.
2. traffic reporting chain as claimed in claim 1, wherein in this at least one detective's car, only by the speed of a motor vehicle, faster than detective's car of the speed of this dynamic traffic service administrative center broadcast, return its this corresponding instant top speed to this dynamic traffic service administrative center, then by this dynamic traffic service administrative center broadcast the fastest speed of a motor vehicle in requitable instant top speed.
3. traffic reporting chain as claimed in claim 1, wherein this dynamic traffic service administrative center utilizes one first timer to control the Cycle Length of this top speed of broadcast.
4. traffic reporting chain as claimed in claim 1, the length that wherein this at least one detective's car is set one second timer controls when return this corresponding instant top speed.
5. traffic reporting chain as claimed in claim 4, wherein this at least one detective's car is greater than 1 setup parameter and sets the length of this second timer in conjunction with a value, allows the faster detective Che Nengyue of the speed of a motor vehicle early return its corresponding instant max. speed to this dynamic traffic service administrative center.
6. traffic reporting chain as claimed in claim 1, wherein, when this corresponding instant top speed of this at least one detective's car is greater than this at least one instant top speed of the irregular broadcast of this dynamic traffic service administrative center, the length that this at least one detective's car is set one the 3rd timer controls when return this corresponding instant top speed.
7. traffic reporting chain as claimed in claim 6, wherein this at least one detective's car is greater than 1 setup parameter and sets the length of the 3rd timer in conjunction with another value, allow in this at least one detective's car, accelerate larger detective Che Nengyue and early return its corresponding instant max. speed to this dynamic traffic service administrative center.
8. reduce a traffic report method for communication requirement, be applied to a traffic reporting chain, at least one detective's car that this system has a dynamic traffic service administrative center and is connected with this center to center communications, the method comprises:
By this dynamic traffic service administrative center, periodically broadcast a top speed Vmax of the upper cycle collection in a cycle, and irregularly broadcast at least one top speed Vm-tmp of return in the current cycle; And
According to each detective's car of the speed of this dynamic traffic service administrative center broadcast and this at least one detective's car corresponding instant top speed Vcmax within this current cycle itself, this at least one detective's car determines that this corresponding instant top speed Vcmax of whether return itself is to this dynamic traffic service administrative center.
9. traffic report method as claimed in claim 8, wherein, in this at least one detective's car, only returns its this corresponding instant top speed to this dynamic traffic service administrative center by the speed of a motor vehicle faster than detective's car of the speed of this dynamic traffic service administrative center broadcast.
10. traffic report method as claimed in claim 8, wherein this dynamic traffic service administrative center controls the Cycle Length of this Vmax of broadcast by one first timer.
11. traffic report methods as claimed in claim 8, wherein, when the detective of one in this at least one detective's car car return speed of a motor vehicle is received by this dynamic traffic service administrative center, this dynamic traffic service administrative center also carries out:
Check whether this current cycle receives detective's car return speed of a motor vehicle for the first time;
Be, set this Vm-tmp and be after the speed of a motor vehicle of this detective's car return, broadcast this Vm-tmp; And
Afterwards, the speed of a motor vehicle that receives again detective's car return when this dynamic traffic service administrative center is greater than this Vm-tmp person, upgrades this Vm-tmp, and broadcasts this Vm-tmp.
12. traffic report methods as claimed in claim 8, wherein this at least one detective's car is carried out corresponding action according to the event of five kinds of aspects during returning the speed of a motor vehicle, and the event of these five kinds of aspects is respectively and receives this Vmax, receives that this Vm-tmp, this Vcmax increase, enter a new section and arrived the return time.
13. traffic report methods as claimed in claim 12, wherein, when receiving that the event of this Vmax occurs, receive that detective's car of this Vmax is also carried out following action:
The time that this Vmax received in record; And
Set the length of a timer Tc of this Vcmax of return, control and when return this Vcmax.
14. traffic report methods as claimed in claim 12, wherein, when receiving that the event of this Vm-tmp occurs, receive that detective's car of this Vm-tmp is removed a timer of this Vcmax of return.
15. traffic report methods as claimed in claim 12, when the event wherein increasing as this Vcmax occurs, the detective's car that increases this Vcmax is also carried out following action:
If this detective's car not yet received this Vm-tmp, adjust a timer of this Vcmax of return;
If this detective's car had received this Vm-tmp,, when Vcmax is greater than this Vm-tmp, set a timer Tm-tmp, when this timer Tm-tmp is this detective's car acceleration, return the timer of this Vcmax.
16. traffic report methods as claimed in claim 15, wherein when entering the event in a new section while occurring, the action when event that the detective's car that enters this new section is carried out this Vcmax to be increased occurs.
17. traffic report methods as claimed in claim 12, wherein, when the detective of one in this at least one detective's car car has arrived the return time, this detective's car is returned this Vcmax to this dynamic traffic service administrative center.
18. traffic report methods as claimed in claim 13, wherein in the setting of the length of this timer Tc, in conjunction with a setup parameter α, α >1, allows this faster detective's car of the speed of a motor vehicle more early return this Vcmax to this dynamic traffic service administrative center.
19. traffic report methods as claimed in claim 15, wherein in the setting of the length of this timer Tm-tmp, in conjunction with a setup parameter β, β >1, allows this larger detective's car of acceleration more first return this Vcmax to this dynamic traffic service administrative center.
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| CN201010501076.4A CN102446416B (en) | 2010-10-09 | 2010-10-09 | Traffic notification system for reducing communication demand and method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551945A (en) * | 2009-05-13 | 2009-10-07 | 东南大学 | Traffic security early warning method of traffic control system on highway |
| CN101567126A (en) * | 2009-05-31 | 2009-10-28 | 上海宝康电子控制工程有限公司 | Urban road traffic information detecting and issuing system |
| CN101814234A (en) * | 2010-01-11 | 2010-08-25 | 北京世纪高通科技有限公司 | Method and system for processing traffic information |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1209644A1 (en) * | 2000-11-23 | 2002-05-29 | Telefonaktiebolaget L M Ericsson (Publ) | Traffic management system including a layered management structure |
| KR20040066351A (en) * | 2003-01-17 | 2004-07-27 | 엘지전자 주식회사 | Device and method for information collecting in navigation system |
| US7246007B2 (en) * | 2004-03-24 | 2007-07-17 | General Motors Corporation | System and method of communicating traffic information |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101551945A (en) * | 2009-05-13 | 2009-10-07 | 东南大学 | Traffic security early warning method of traffic control system on highway |
| CN101567126A (en) * | 2009-05-31 | 2009-10-28 | 上海宝康电子控制工程有限公司 | Urban road traffic information detecting and issuing system |
| CN101814234A (en) * | 2010-01-11 | 2010-08-25 | 北京世纪高通科技有限公司 | Method and system for processing traffic information |
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