CN106846912A - Highway communication early warning and method based on ZigBee - Google Patents
Highway communication early warning and method based on ZigBee Download PDFInfo
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- CN106846912A CN106846912A CN201710203885.9A CN201710203885A CN106846912A CN 106846912 A CN106846912 A CN 106846912A CN 201710203885 A CN201710203885 A CN 201710203885A CN 106846912 A CN106846912 A CN 106846912A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/16—Anti-collision systems
- G08G1/161—Decentralised systems, e.g. inter-vehicle communication
- G08G1/162—Decentralised systems, e.g. inter-vehicle communication event-triggered
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/16—Anti-collision systems
- G08G1/164—Centralised systems, e.g. external to vehicles
Abstract
It is mutually to set up a communication network at random between a kind of terminal the present invention relates to ZigBee networkings, any node into network can mutually propagate information and reach the very first time and propagates early warning by many jump mechanisms；Specifically related to it is based on highway communication early warning and the method for ZigBee.If highway is divided into trunk section, each section includes：At least one route service node unit, and some vehicle-mounted ZigBee node units；Therefore, the invention has the advantages that：1. the remote spread speed of early warning distance is fast, and information can be delivered to outside several kilometers by multi-hop between vehicle, to the sufficient reaction distance of driver and time.2. early warning information route of transmission is not disturbed by bad weather, and ZigBee uses 2.4G frequency range antijamming capability strong securities.3. the accident reaction speed of traffic control department is improve.The networking capacity of 4.ZigBee is big, can allow a large amount of car-mounted terminal gold such as section.The functional expansionary of 5.ZigBee is strong, can extend on the basis of ZigBee more multi-functional.
Description
Technical field
It is mutually to set up a communication network at random between a kind of terminal, into network the present invention relates to ZigBee networkings
Any node can by many jump mechanisms mutually propagate information reach the very first time propagate early warning；Specifically related to it is based on ZigBee
Highway communication early warning and method.
Background technology
Zigbee is the low-power consumption Personal Area Network agreement based on IEEE802.15.4 standards.According to the technology that this agreement specifies
It is the wireless communication technology of a kind of short distance, low-power consumption.This title is waved from eight words of honeybee, because honeybee (bee) is
By circle in the air and " drone " (zig) shake wing " dancing " come and companion transmission pollen where azimuth information, that is to say, that honey
Honeybee constitutes the communication network in colony by such mode.Be characterized in closely, low complex degree, self-organizing, low-power consumption,
Low data rate, low cost.It is mainly suitable for, for automatically controlling and remote control field, various equipment being embedded in.In short
It, ZigBee is exactly a kind of cheap, the near radio networking mechanics of communication of low-power consumption.ZigBee digital transmission modules are similar to shifting
Dynamic network base station.Communication distance supports wireless extensions from 75 meters to hundreds of meters, several kilometers of standard.
Existing vehicle anti-collision early warning system is mainly used in assisting driver to avoid high speed, low speed from knocking into the back, and is not intended in high speed
Run-off-road is known, with the major traffic accidents such as pedestrian impact.Driver, continual detection car are helped as the 3rd eye
Road ahead situation, system can recognize and judge various potential dangerous situations, and by different sound and visual alerts,
To help driver to avoid or slow down collision accident.
Vehicle anti-collision early warning system is the vehicle anti-collision early warning system based on intelligent video analysis treatment, by dynamic video
Camera technique, computer image processing technology realize its warning function.Major function is：It is spacing monitoring and early warning of knocking into the back, preceding
Square anti-collision warning, lane departure warning, navigation feature, black box function.Relative to domestic and international existing vehicle anti-collision early warning system
System, such as ultrasonic anti-collision early warning system, radar collision early warning system, laser anti-collision early warning system, infrared ray anti-collision early warning system
Deng all there is unrivaled advantage in, function, stability, accuracy, hommization, price.Performance is remarkable, can be round-the-clock, long
Time stable operation, greatly improves the comfortableness and security of car steering.
But vehicle anti-collision early warning system senses scope of the prior art is nearer, it is only limitted to onboard sensor or image is adopted
The sensing range of collection equipment.Sighting distance is usually no more than, and is limited larger by weather conditions.On the highway run at high speed
When, its early warning range cannot meet the demand under high-speed case.And equipment cost is higher, algorithm and system are more complicated, easily go out
Existing failure also has easily by adverse weather conditions.
The content of the invention
Expressway of the present invention mainly existing for solution prior art is in the bad weather such as low visibility or road surface slippery situation
In the case of traffic accident early warning, with preventing secondary accidents or and the chain of rings knock into the back the technical problem of major traffic accidents；There is provided one
Kind of low-power consumption, low data bulk and low cost, and use free frequency range 2.4G, can anti-interference, high security high and can from
The highway communication early warning based on ZigBee of dynamic dynamic group net and method
Above-mentioned technical problem of the invention is mainly what is be addressed by following technical proposals：
Highway communication early warning system based on ZigBee, it is characterised in that if highway is divided into trunk section, each road
Section includes：
At least one route service node unit：It is arranged on the isolation road between both direction track, for receiving simultaneously
Forwarding accident early warning information；
Some vehicle-mounted ZigBee node units：It is arranged on driving vehicle, when a certain vehicle occurs accident, accident occurs
The vehicle-mounted ZigBee node unit of vehicle sends accident early warning information to other vehicle-mounted ZigBee node units, and other are vehicle-mounted
ZigBee node unit receives, carries and forward accident early warning information to route service node unit and by route service node list
Accident early warning information is transmitted to the route service node unit in adjacent former and later two sections for unit.
Highway communication method for early warning based on ZigBee, it is characterised in that if highway is divided into trunk section, each road
Intersegmental part is same network number PANID；The route service node being arranged between both direction track is provided with each section
Unit is some, and into the vehicle-mounted ZigBee node unit on the both direction track in section, defines one of direction
Vehicle-mounted ZigBee node unit is the vehicle-mounted ZigBee node unit of the first group number, another rightabout vehicle-mounted ZigBee node
Unit is the vehicle-mounted ZigBee node unit of the second group number, and the traffic prewarning method includes：
Vehicle-mounted ZigBee node unit networking step：Route service node unit real time scan covers the wagon flow shape in section
Condition, when the vehicle for carrying vehicle-mounted ZigBee node unit enters covering section, assigns vehicle-mounted ZigBee node unit and puts on record letter
Breath, that is, distribute network number PANID, short address and group number, when the vehicle for carrying vehicle-mounted ZigBee node unit exits covering road
Duan Shi, empties network number PANID, short address and group number；
Accident prediction occurring step：When a fault occurs, occur vehicle-mounted ZigBee node unit where accident vehicle to away from
From the nearest vehicle-mounted ZigBee node unit of normally travel or route service node cell broadcast accident early warning information, from generation thing
Therefore the vehicle-mounted ZigBee node unit of the nearest normally travel of vehicle-mounted ZigBee node cell distance is received, carried and turns where vehicle
Hair accident early warning information travels vehicle-mounted ZigBee node units or route service node unit to other, when generation accident vehicle institute
After the front and back route service node unit in region receives accident early warning information, there is the rear of accident vehicle region
Accident early warning information is uploaded traffic control department, or the route service node for first receiving accident early warning information by route service node unit
Accident early warning information is uploaded traffic control department by unit, the route service node list that the previous section of accident vehicle region occurs
Accident early warning information is transmitted to the vehicle-mounted ZigBee node unit of traveling in place section for unit, and accident vehicle region occurs
The accident early warning information that the route service node unit reception vehicle-mounted ZigBee node unit of traveling in latter section sends, and according to
Whether accident early warning validation of information eliminates early warning.
In the above-mentioned highway communication method for early warning based on ZigBee, in accident prediction occurring step, it is divided into vehicle flowrate
Big and vehicle flowrate hour, the information passing steps of early warning, specifically：
When vehicle flowrate is big, that is, vehicle-mounted ZigBee node unit covering maximum delivered radius where there is accident vehicle is present
The vehicle-mounted ZigBee node unit of closest normally travel, sends out to the closest vehicle-mounted ZigBee node unit of normally travel
Vehicle-mounted ZigBee node unit is to the closest vehicle-mounted ZigBee node unit of normally travel, Yi Jisuo where raw accident vehicle
In the route service node cell broadcast accident early warning information in region, the vehicle-mounted ZigBee node unit of closest normally travel
Continue to broadcast accident early warning information successively to the vehicle-mounted ZigBee node unit of other normally travels, other normally travels are vehicle-mounted
ZigBee node unit receives accident early warning information and believes to the Partial route service node unit forwards accident early warning at place
Breath；
When vehicle flowrate hour, that is, vehicle-mounted ZigBee node unit covering maximum delivered radius where there is accident vehicle is not deposited
In the closest vehicle-mounted ZigBee node unit of normally travel, also in the absence of route service node unit, then to different group numbers
Rightabout normally travel vehicle-mounted ZigBee node unit send accident early warning information, rightabout normally travel
Vehicle-mounted ZigBee node unit receives the vehicle-mounted ZigBee node unit region to normally travel after accident early warning information
Vehicle-mounted ZigBee node unit or route service node unit send accident early warning information, the vehicle-mounted ZigBee of other normally travels
Node unit receives accident early warning information and to the Partial route service node unit forwards accident early warning information at place.
In the above-mentioned highway communication method for early warning based on ZigBee, in the accident prediction occurring step, from generation thing
Therefore the vehicle-mounted ZigBee node unit of the nearest normally travel of vehicle-mounted ZigBee node cell distance is received, carried and turns where vehicle
Send out accident early warning information is to other specific methods for travelling vehicle-mounted ZigBee node units or route service node unit：
Step 1, receives accident early warning information, and judges whether group number where accident vehicle is identical with the machine, and according to sentencing
Disconnected result selection is performed：
Selection performs one：If group number where accident vehicle is identical with the machine, reading incident area position coordinate, and after
It is continuous to perform next step；
Selection performs two：If group number where accident vehicle is different from the machine, and current the machine is in route service node unit
When in coverage, forwarding accident early warning information is to removing accident early warning information after route service node unit；Current the machine is not
When in route service node unit coverage, accident early warning information is carried, parallel to a route service section in incident area
Dot element region, and accident early warning information is sent to accident early warning information is removed after route service node unit；
Whether step 2, judges incident area in front of the machine, and is selected to perform according to judged result：
Selection performs one：If incident area calculates the machine and thing in local front, the vehicle-mounted ZigBee node unit of the machine
Therefore there is point distance prompt local user, and accident early warning information is carried, parallel to the next route service node list of incident area
First region, and accident early warning information is sent to accident early warning information is removed after route service node unit；
Selection performs two：If incident area is not or not local front, it is pre- that the vehicle-mounted ZigBee node unit of the machine carries accident
Alert information, parallel to the next route service node unit region of incident area, and is sent to route by accident early warning information
Accident early warning information is removed after service node unit.
In the above-mentioned highway communication method for early warning based on ZigBee, it is characterised in that the accident prediction occurring step
In, after route service node unit receives accident early warning information, carry out forwarding accident early warning information, and by accident early warning information
Upload comprising the concrete steps that for traffic control department：
Step 1, current route service node unit receives early warning accident early warning information, and judges that the early warning accident early warning is believed
Whether breath is the early warning accident early warning information of vehicle-mounted ZigBee node unit forwards, and is selected to perform according to judged result：
Selection performs one：If the early warning accident early warning information of vehicle-mounted ZigBee node unit forwards, then judge current road
By service node unit whether be incident area a upper region service node unit：
If so, then knowing the services sites of subsequent region by 4G Netcoms and being covered to current route service node unit
All vehicles in communication range send accident early warning information；
If it is not, the services sites in a upper region is then known by 4G Netcoms, until there is vehicle-mounted ZigBee node unit to send
After early warning accident early warning information to current route service node unit, accident early warning information is removed；
Selection performs one：If not the early warning accident early warning information of vehicle-mounted ZigBee node unit forwards, then judge current
Route service node unit whether be incident area a upper region service node unit：
If so, all vehicles in the communication range for then being covered to current route service node unit send accident early warning
Information；
If it is not, until thering is vehicle-mounted ZigBee node unit to send early warning accident early warning information to current route service node
After unit, accident early warning information is removed.
In the above-mentioned highway communication method for early warning based on ZigBee, also including a real-time anticipation early warning information step：
After any one normally travel vehicle enters in the communication range that route service node unit is covered, route service node unit
Vehicle-mounted ZigBee node unit record information in the normally travel vehicle is informed next route clothes of vehicle heading
Business node unit, next route service node unit starts timing after receiving record information, and is judged according to timing time：
Judge one：If next route service node unit from after receiving the record information of the vehicle-mounted ZigBee node unit
Do not driven in setting time in the communication range that next route service node unit is covered and put on record, then judged
The vehicle where vehicle-mounted ZigBee node unit breaks down, and performs accident prediction occurring step；
Judge two：If next route service node unit from after receiving the record information of the vehicle-mounted ZigBee node unit
Driven in setting time in the communication range that next route service node unit is covered and put on record, then judge that this is vehicle-mounted
Vehicle traveling is normal where ZigBee node unit.
In the above-mentioned highway communication method for early warning based on ZigBee, in vehicle-mounted ZigBee node unit networking step,
Vehicle-mounted ZigBee node unit first enters into the short address bag being endowed in the communication range that route service node unit is covered
Initial coordinate is included, and is performed：In real time read speed calculate operating range add deduct initial coordinate estimation coordinate and：
If vehicle-mounted ZigBee node unit continues to refresh after travelling in the communication range that next service node unit is covered
Coordinate, and to repeat read in real time speed and calculate operating range and add deduct initial coordinate estimation until vehicle-mounted ZigBee node list
Unit's traveling empties all information to after exporting；
If vehicle-mounted ZigBee node unit continues directly to traveling to exporting, all information are emptied
In the above-mentioned highway communication method for early warning based on ZigBee, accident early warning information transmission content is included：Accident vehicle
Short address, time of casualty, accident vehicle group number, accident estimated position, accident kind number, accident vehicle license plate number, information hair
Make arrangements for his funeral and hold short address, information to send terminal group number.
In the above-mentioned highway communication method for early warning based on ZigBee, route service node unit determines the seat of Current vehicle
The specific method of cursor position is：
Vehicle location is represented using one-dimensional coordinate；Initial coordinate bit is endowed when car-mounted terminal is into Entry to motorway
Put X0；Terminal was every one second velocity information v of reading vehiclei, then to drive to acquisition time t seconds before next service node, row
The distance x for sailing0Can be estimated asSo estimated coordinates are X=X0±x0, unlike signs determine by direction；Due to service
Node communication radius R is big, and car-mounted terminal r is small, thus only when car-mounted terminal away from next service node distance for r when car-mounted terminal
Node and service terminal node can just be in communication with each other；So car-mounted terminal be just close to service node r apart from when send standby
Part information, one coordinate X of now service node response1Refresh now coordinate；Next stage travels distanceEstimate
Coordinate X=X1±x1。
Therefore, the invention has the advantages that：1. the remote spread speed of early warning distance is fast, and information can be by multi-hop between vehicle
It is delivered to outside several kilometers, to the sufficient reaction distance of driver and time.2. early warning information route of transmission is not dry by bad weather
Disturb, ZigBee uses 2.4G frequency range antijamming capability strong securities.3. the accident reaction speed of traffic control department is improve.
The networking capacity of 4.ZigBee is big, can allow a large amount of car-mounted terminal gold such as section.The functional expansionary of 5.ZigBee is strong, can
It is more multi-functional to extend on the basis of ZigBee..
Brief description of the drawings
Accompanying drawing 1 is car-mounted terminal node networking flow chart of the invention.
Accompanying drawing 2 is that vehicle-mounted node location of the invention estimates flow chart.
Accompanying drawing 3 is node packet and early warning information transmission schematic diagram (1- service sections when vehicle flowrate is big in the embodiment of the present invention
The communication radius of the communication radius R- service nodes of the point 2- vehicle 3- vehicles vehicle-mounted nodes of r-, red node is accident vehicle, red
Color solid line is early warning information direction of transfer, and red dotted line is 4G net transmission informations direction).
Accompanying drawing 4 is the packet of vehicle flowrate hour node and early warning information transmission schematic diagram (1- service sections in the embodiment of the present invention
The communication radius of the communication radius R- service nodes of the point 2- vehicle 3- vehicles vehicle-mounted nodes of r-, red node is accident vehicle, red
Color solid line is early warning information direction of transfer, and red dotted line is 4G net transmission informations direction, and dashed rectangle is place after vehicle movement
Position).
Accompanying drawing 5 is accident prediction occurring flow chart of the present invention.
Accompanying drawing 6 is car-mounted terminal accident treatment flow chart in the present invention.
Accompanying drawing 7 is service node accident treatment flow chart in the present invention.
Accompanying drawing 8 is that service node accident judges flow in the case of not receiving early warning information in the present invention.
Specific embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
The present invention relates to ZigBee, early warning information is sent using ZigBee flexible networkings and remote multi-hop communication is fed
Enter all vehicles of accident section.The present invention needs to arrange ZigBee node on automobile and highway.Particular content is as follows：
A certain section is considered as a network, section inside is same network number (PANID).And by the node in network
It is divided into three groups.One group is the route service node being manually arranged between both direction track, and its function is to receive and forward pre-
Alert information.Second group is not into the vehicle-mounted ZigBee node on the both direction track in section with third component.Service node
Need to receive accident information and for all car-mounted terminals in section provide early warning information, so route service node can be to 2 groups 3 groups
Send different group information, it is also possible to receive 2 groups 3 groups of different group information.Due to typically having isolation strip between both direction track, so
If the automobile normal running that accident is not interfered with another direction lane occurs in a direction lane, so car-mounted terminal section
Point to receive to judge whether after early warning information.Service node judgement is during appearance accident
The accident information of which group, needs to take accident group number in early warning information.In addition route service node also has assistance vehicle to enter
The function of row location estimation：When vehicle enters the communication range of a certain route service node, route service node can be to vehicle-mounted end
End sends the service range that the information of oneself tells that vehicle enters oneself and waits vehicle feedback self information, but due to route
Service node communication radius are big, and car-mounted terminal communication radius are small, so only vehicle is away from the logical of one car-mounted terminal of service node
Self information could be fed back to route service node during letter radius.So when vehicle feeds back successfully for the first time, and service node
Own coordinate is, it is known that be service node coordinate plus-minus car-mounted terminal communication half according to the vehicle coordinate that vehicle group number can be tried to achieve now
Footpath distance (because section is a line, thus coordinate here we use one-dimensional coordinate, plus-minus to be determined by group number).Service section
Point now to car-mounted terminal, will refresh its coordinate position by car-mounted terminal coordinates feedback.Coordinate afterwards is added by the coordinate for refreshing
Subtract automobile real-time speed and be multiplied by the mileage number of time and estimated, coordinate is refreshed until next service node can be fed back.
When vehicle enters section, the router of special ZigBee-network is provided with the gateway of section, into after section
Network number, short address and group number will be endowed with the router networking.The vehicle-mounted ZigBee for leaving section can be special by exit
Being informed with router will leave section, and vehicle-mounted ZigBee node understands networking and initializes oneself into search after leaving section
Network state.
Route service node communication range wants any region on high way coverage end, and the early warning for reaching unshadowed area is led to
Know.The service node of network needs power amplification and skilled antenna and is reduced to reach the coverage of 5km service section in section
The arrangement quantity of point.Route service node can every 10km arrange one just can be to section all standing.Service node is furnished with 4G
Communication equipment, can directly be connected into 4G networks, and accident information is sent to traffic control department with interconnected network mode, be also convenient for traffic control portion
Door is monitored or by service node additional notifications emergency traffic information to vehicle by network to each service node.
Vehicle-mounted ZigBee node and acceleration transducer, crash sensor etc. are connected, and if there is collision alarm, are then regarded
To there is traffic accident, and the minor accident information such as cast anchor slightly can manually inform car-mounted terminal.Moment is produced in fault message
ZigBee node can broadcast accident information, and this information includes accident vehicle short address, time of casualty, the accident vehicle group of oneself
Number, accident estimated position, accident kind number, accident vehicle license plate number, information sends terminal short address, information and sends set of terminal
Number.Neighbouring car-mounted terminal receives early warning information and judges whether it is that same track accident judges that oneself is closed with incident area position again
System, if accident section, alerting drivers, if having sailed out of incident area but still having been warned in certain risk distance will be sailed into
Driver.In addition, because car-mounted terminal communication radius are limited, car-mounted terminal away from route service node farther out when cannot be with road
Information from route service node may only be received by service node communication.Accident section is sailed out of based on this car-mounted terminal to be followed by
Stop warning, then judge whether to receive the early warning accident information from routing node, if then going off the air, if without if
Continue to broadcast and realize being gone off the air and multi-hop until receiving the accident notification from route service node.When vehicle is rare without
When method completes multi-hop, vehicle directly carries the accident information to next route service node and forwards, and the route service node is obtained
Accident information is sent in incident area by a service node by 4G networks after to accident information and traffic control department is notified.Such as
Fruit vehicle judges just be forwarded into incident area, and the orientation result in formation of information floods, by the multi-hop of such information
Propagate early warning information far, early warning information floods until traveling to a service node Stop message orientation in incident area,
And this accident information is transmitted to a service node in incident area.Warning function avoids the need for vehicle-mounted node multi-hop afterwards
To realize, but the vehicle front accident information sailed into its communication radius is informed by service node.In addition, to prevent car
Rareness cannot complete multi-hop and wear information to service node, using the car on incorgruous track receive different group of accident information by this
Information is carried to a service node in incident area.Extreme case is considered further that, if accident vehicle cannot communicate informs route
Service node and nearby some time be not by a car.To solve this extreme case, each car enters route service section
Point information can be put on record (packet group number containing vehicle, vehicle short address sail the time into) on route service node, the route service
The route service section region that this will be sailed into by the 4G network signals vehicles.If next route service node is being exceeded well over
T (t=10km/ sections require minimum speed) does not reach next route service node record information yet, then think that the car may
Broken down between the two route service nodes or event may occur between the two route service nodes in the car car-mounted terminal
Barrier.Either which kind of reason route service node sends early warning information, informs that front section is likely to occur accident, and inform traffic control
Department is processed.
Such one the vehicle very first time between two service nodes of the moment of fault can be allowed to obtain early warning as described above, may be used also
Early warning is obtained outside at least 5km with the vehicle that will be sailed into after allowing, this distance is not considerably beyond sighting distance and by bad weather shadow
Ring to the vehicle enough reaction time.A system will be contacted between vehicle mutually coordinated, be an individually system much than vehicle
System has more preferable security.
Specific embodiment described herein is only to the spiritual explanation for example of the present invention.Technology neck belonging to of the invention
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from spirit of the invention or surmount scope defined in appended claims.
Claims (9)
1. the highway communication early warning system of ZigBee is based on, it is characterised in that if highway is divided into trunk section, each section
Including：
At least one route service node unit：It is arranged on the isolation road between both direction track, for receiving and forwards
Accident early warning information；
Some vehicle-mounted ZigBee node units：It is arranged on driving vehicle, when a certain vehicle occurs accident, accident vehicle occurs
Vehicle-mounted ZigBee node unit send accident early warning information to other vehicle-mounted ZigBee node units, other vehicle-mounted ZigBee sections
Dot element is received, carried and forwards accident early warning information to route service node unit and by route service node unit by accident
Early warning information is transmitted to the route service node unit in adjacent former and later two sections.
2. the highway communication method for early warning of ZigBee is based on, it is characterised in that if highway is divided into trunk section, each section
Inside is same network number PANID；The route service node list being arranged between both direction track is provided with each section
Unit is some, and into the vehicle-mounted ZigBee node unit on the both direction track in section, defines the car in one of direction
It is the vehicle-mounted ZigBee node unit of the first group number, another rightabout vehicle-mounted ZigBee node list to carry ZigBee node unit
Unit is the vehicle-mounted ZigBee node unit of the second group number, and the traffic prewarning method includes：
Vehicle-mounted ZigBee node unit networking step：Route service node unit real time scan covers the traffic state in section,
When the vehicle for carrying vehicle-mounted ZigBee node unit enters covering section, vehicle-mounted ZigBee node unit record information is assigned,
I.e. distribution network number PANID, short address and group number, section is covered when the vehicle for carrying vehicle-mounted ZigBee node unit is exited
When, empty network number PANID, short address and group number；
Accident prediction occurring step：When a fault occurs, vehicle-mounted ZigBee node unit is to apart from most where there is accident vehicle
The vehicle-mounted ZigBee node unit of near normally travel or route service node cell broadcast accident early warning information, from generation accident vehicle
The vehicle-mounted ZigBee node unit of the nearest normally travel of the vehicle-mounted ZigBee node cell distance in place receives, carries and forward thing
Therefore early warning information is to other vehicle-mounted ZigBee node units of traveling or route service node unit, when generation accident vehicle location
After the front and back route service node unit in domain receives accident early warning information, there is the rear route of accident vehicle region
Accident early warning information is uploaded traffic control department, or the route service node unit for first receiving accident early warning information by service node unit
Accident early warning information is uploaded into traffic control department, the route service node unit that the previous section of accident vehicle region occurs will
Accident early warning information is transmitted to the vehicle-mounted ZigBee node unit of traveling in place section, and the latter of accident vehicle region occurs
The route service node unit in section receives the accident early warning information that the vehicle-mounted ZigBee node unit of traveling sends, and according to accident
Early warning information is confirmed whether to eliminate early warning.
3. the highway communication method for early warning based on ZigBee according to claim 2, it is characterised in that occur in accident pre-
In alert step, it is divided into vehicle flowrate greatly and vehicle flowrate hour, the information passing steps of early warning, specifically：
When vehicle flowrate is big, that is, there is distance in vehicle-mounted ZigBee node unit covering maximum delivered radius where there is accident vehicle
, there is thing to the closest vehicle-mounted ZigBee node unit of normally travel in the vehicle-mounted ZigBee node unit of nearest normally travel
Therefore vehicle-mounted ZigBee node unit is to the closest vehicle-mounted ZigBee node unit of normally travel, and location where vehicle
The route service node cell broadcast accident early warning information in domain, the vehicle-mounted ZigBee node unit of closest normally travel continues
Accident early warning information is broadcasted successively to the vehicle-mounted ZigBee node unit of other normally travels, the vehicle-mounted ZigBee sections of other normally travels
Dot element receives accident early warning information and to the Partial route service node unit forwards accident early warning information at place；
When vehicle flowrate hour, that is, vehicle-mounted ZigBee node unit covering maximum delivered radius where there is accident vehicle do not exist away from
From the nearest vehicle-mounted ZigBee node unit of normally travel, also in the absence of route service node unit, then to the phase of different group numbers
The vehicle-mounted ZigBee node unit of the normally travel of opposite direction sends accident early warning information, rightabout normally travel it is vehicle-mounted
ZigBee node unit receives the car of the vehicle-mounted ZigBee node unit region to normally travel after accident early warning information
Carry ZigBee node unit or route service node unit sends accident early warning information, the vehicle-mounted ZigBee node of other normally travels
Unit receives accident early warning information and to the Partial route service node unit forwards accident early warning information at place.
4. the highway communication method for early warning based on ZigBee according to claim 2, it is characterised in that the accident occurs
In warning step, the vehicle-mounted ZigBee sections of the nearest normally travel of the vehicle-mounted ZigBee node cell distance where it there is accident vehicle
Dot element is received, carried and forwards accident early warning information to other vehicle-mounted ZigBee node units of traveling or route service node list
Unit specific method be：
Step 1, receives accident early warning information, and judges whether accident vehicle place group number is identical with the machine, and is tied according to judgement
Fruit selection is performed：
Selection performs one：If group number where accident vehicle is identical with the machine, incident area position coordinate is read, and continue to hold
Row next step；
Selection performs two：If group number where accident vehicle is different from the machine, and current the machine is covered in route service node unit
In the range of when, forwarding accident early warning information to after route service node unit remove accident early warning information；Current the machine Bu roads
During by service node unit coverage, accident early warning information is carried, parallel to a route service node list in incident area
First region, and accident early warning information is sent to accident early warning information is removed after route service node unit；
Whether step 2, judges incident area in front of the machine, and is selected to perform according to judged result：
Selection performs one：If incident area is in local front, the vehicle-mounted ZigBee node unit of the machine calculates the machine and is sent out with accident
Raw point distance prompt local user, and accident early warning information is carried, parallel to the next route service node unit institute of incident area
In region, and accident early warning information is sent to accident early warning information is removed after route service node unit；
Selection performs two：If not in local front, the vehicle-mounted ZigBee node unit of the machine carries accident early warning letter to incident area
Breath, parallel to the next route service node unit region of incident area, and is sent to route service by accident early warning information
Accident early warning information is removed after node unit.
5. the highway communication method for early warning based on ZigBee according to claim 2, it is characterised in that characterized in that,
In the accident prediction occurring step, after route service node unit receives accident early warning information, forwarding accident early warning is carried out
Information, and accident early warning information is uploaded into comprising the concrete steps that for traffic control department：
Step 1, current route service node unit receives early warning accident early warning information, and judges that the early warning accident early warning information is
No is the early warning accident early warning information of vehicle-mounted ZigBee node unit forwards, and is selected to perform according to judged result：
Selection performs one：If the early warning accident early warning information of vehicle-mounted ZigBee node unit forwards, then current route clothes are judged
Business node unit whether be incident area a upper region service node unit：
If so, the communication then known the services sites of subsequent region and covered to current route service node unit by 4G Netcoms
In the range of all vehicles send accident early warning information；
If it is not, the services sites in a upper region is then known by 4G Netcoms, until there is vehicle-mounted ZigBee node unit to send early warning
After accident early warning information to current route service node unit, accident early warning information is removed；
Selection performs one：If not the early warning accident early warning information of vehicle-mounted ZigBee node unit forwards, then judge current route
Service node unit whether be incident area a upper region service node unit：
If so, all vehicles in the communication range for then being covered to current route service node unit send accident early warning believing
Breath；
If it is not, until thering is vehicle-mounted ZigBee node unit to send early warning accident early warning information to current route service node unit
Afterwards, accident early warning information is removed.
6. the highway communication method for early warning based on ZigBee according to claim 2, it is characterised in that also including a reality
When anticipation early warning information step：Any one normally travel vehicle enters in the communication range that route service node unit is covered
Afterwards, the vehicle-mounted ZigBee node unit record information in the normally travel vehicle is informed that vehicle is travelled by route service node unit
Next route service node unit in direction, next route service node unit starts timing, and root after receiving record information
Judged according to timing time：
Judge one：If next route service node unit is from after the record information for receiving the vehicle-mounted ZigBee node unit in setting
Do not driven in time in the communication range that next route service node unit is covered and put on record, then judge the car
Carry vehicle where ZigBee node unit to break down, and perform accident prediction occurring step；
Judge two：If next route service node unit is from after the record information for receiving the vehicle-mounted ZigBee node unit in setting
Driven in time in the communication range that next route service node unit is covered and put on record, then judge that this is vehicle-mounted
Vehicle traveling is normal where ZigBee node unit.
7. the highway communication method for early warning based on ZigBee according to claim 1, it is characterised in that in vehicle-mounted ZigBee
In node unit networking step, vehicle-mounted ZigBee node unit first enters into the communication range that route service node unit is covered
The short address being inside endowed includes initial coordinate, and performs：Speed is read in real time calculate the operating range initial coordinate that adds deduct estimate
Calculate coordinate and：
If vehicle-mounted ZigBee node unit continues to refresh coordinate after travelling in the communication range that next service node unit is covered,
And to repeat read in real time speed and calculate operating range and add deduct initial coordinate estimation until vehicle-mounted ZigBee node cell row
Sail to outlet and empty all information；
If vehicle-mounted ZigBee node unit continues directly to traveling to exporting, all information are emptied.
8. the highway communication method for early warning based on ZigBee according to claim 2, it is characterised in that accident early warning information
Transmission content is included：Accident vehicle short address, time of casualty, accident vehicle group number, accident estimated position, accident kind number, thing
Therefore vehicle license plate number, information send terminal short address, information and send terminal group number.
9. the highway communication method for early warning based on ZigBee according to claim 1, it is characterised in that route service node
Unit determines that the specific method of the coordinate position of Current vehicle is：
Vehicle location is represented using one-dimensional coordinate；Initial coordinate position X is endowed when car-mounted terminal is into Entry to motorway0；
Terminal was every one second velocity information v of reading vehiclei, then to drive to acquisition time t seconds before next service node, traveling
Distance x0Can be estimated asSo estimated coordinates are X=X0±x0, unlike signs determine by direction；Due to service node
Communication radius R is big, and car-mounted terminal r is small, thus only when car-mounted terminal away from next service node distance for r when car-mounted terminal node
Can be just in communication with each other with service terminal node；So car-mounted terminal be just close to service node r apart from when send backup letter
Breath, one coordinate X of now service node response1Refresh now coordinate；Next stage travels distanceThe coordinate of estimation
X=X1±x1。
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