CN102104400B - Communication method for on-vehicle unit and roadside base station in ambiguous path identification system - Google Patents
Communication method for on-vehicle unit and roadside base station in ambiguous path identification system Download PDFInfo
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- CN102104400B CN102104400B CN2011100382290A CN201110038229A CN102104400B CN 102104400 B CN102104400 B CN 102104400B CN 2011100382290 A CN2011100382290 A CN 2011100382290A CN 201110038229 A CN201110038229 A CN 201110038229A CN 102104400 B CN102104400 B CN 102104400B
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Abstract
The invention discloses a communication method for an on-vehicle unit and a roadside base station in an ambiguous path identification system. The method comprises the following steps that: the roadside base station broadcasts a broadcast message comprising path information and at least one on-vehicle unit identification; the on-vehicle unit receives the broadcast message, records the path information, and compares each of the at least one on-vehicle unit identification with the on-vehicle unit identification per se, and sends an acknowledgement message comprising the on-vehicle unit identification per se to the roadside base station if the on-vehicle unit confirms that no on-vehicle unit identification is the same as the on-vehicle unit identification per se; the roadside base station receives the acknowledgement message, updates the at least one on-vehicle unit identification by using the on-vehicle unit identification in the acknowledgement message, and uploads the on-vehicle unit identification in the acknowledgement message to a data center, wherein one of the at least one on-vehicle unit identification is updated; and the roadside base station broadcasts the broadcast message comprising the path information and the updated at least one on-vehicle unit identification.
Description
Technical field
The present invention relates to the short-range communication technology of highway ambiguous path recognition system, more particularly, relate to a kind of method that in highway ambiguous path recognition system, board units is communicated by letter with road side base station.
Background technology
The path ambiguity refers to that mainly there is a more than driving path in vehicle from any to another point in freeway net.For ambiguous path, identify the difficult problem in this expressway network toll, relevant enterprise has also proposed various solutions at present, comprising the ambiguous path recognition system of using radio-frequency (RF) identification (RFID) technology.
As described in the CN201054714Y Chinese utility model patent, the ambiguous path recognition system can be comprised of road side base station (RSU), track card reader and board units (OBU).Different sections of highway arranges a kind of radio communication device (that is, road side base station RSU) in road network, and it can broadcast the identification code in path, place continuously; In the road network porch, the fee-collector writes OBU to entrance information by the track card reader, then gives the driver OBU; When vehicle travelled on road, the OBU in car can receive the Path Recognition code that RSU sends, and is kept in non-volatile memory cells; When vehicle arrived destination (road network outlet), the driver returned OBU to the fee-collector, and the fee-collector is entered into all routing informations of preserving in OBU in Fare Collection System by the track card reader; These routing informations are the foundations that accurately split account.
Fig. 1 is the schematic diagram that the communication means of traditional ambiguous path recognition system is shown.As shown in Figure 1, the data center of ambiguous path recognition system sends to RSU by the Path Recognition code in each section path, and RSU broadcast comprises the message of the Path Recognition code in this section path, and OBU receives this message, and the store path identification code.Yet, in ambiguous path recognition system as above, for One-to-All Broadcast, communicate by letter between RSU and OBU.That is to say, information is to flow to OBU from RSU, and can not flow to RSU by OBU.In this case, can't realize the collection of Real-time Traffic Information.Therefore, need a kind of method of two-way communication reliably between board units and road side base station that can realize in the ambiguous path recognition system.
Summary of the invention
To be partly articulated in the following description the other aspect of the present invention and/or advantage, by describing, it can become clearer, or can understand by implementing the present invention.
According to an aspect of the present invention, provide a kind of method that in ambiguous path recognition system, board units is communicated by letter with road side base station, described method comprises: road side base station broadcast comprises the broadcast of routing information and at least one board units sign; Board units receives broadcast, the routing information comprised in recorded announce message, and each in described at least one board units sign comprised in broadcast identified and compare with self board units; If board units confirms in described at least one board units sign not exist the board units sign identical with the board units sign of himself, the confirmation message that will comprise the board units sign of self sends to road side base station; Road side base station confirmation of receipt message, use described at least one the board units sign of the board units identification renewal comprised in acknowledge message, and the board units comprised in acknowledge message is identified to the data center that uploads to described ambiguous path recognition system, wherein, a board units sign in described at least one board units sign is updated; Road side base station broadcast comprises the broadcast of described at least one board units sign of routing information and renewal.
In addition, broadcast comprises 4 board units signs.
In addition, the length of described at least one board units sign is 4 bytes, and default setting is FF FF FF FF.
In addition, board units is recorded in the routing information comprised in broadcast in non-volatile memory cells.
In addition, if board units confirms in described at least one board units sign to exist the board units sign identical with the board units sign of himself, board units does not send acknowledge message.
In addition, acknowledge message also comprises the vehicles identifications information of the vehicle with this board units.
In addition, board units receives the vehicles identifications information of vehicle with communication.
In addition, road side base station uploads to the vehicles identifications information that comprises in acknowledge message and the temporal information that comprises the time that receives the confirmation message the data center of described ambiguous path recognition system.
In addition, road side base station upgrades described at least one board units sign in the first-in first-out mode.
In addition, the data center of described ambiguous path recognition system identifies and comprises the temporal information of the time that receives the confirmation message with the board units of uploading and calculates the speed of a motor vehicle of the vehicle with this board units and the vehicle flowrate of road side base station position.
The accompanying drawing explanation
By the description of embodiment being carried out below in conjunction with accompanying drawing, these and/or other aspect of the present invention and advantage will become clear and be easier to and understand, wherein:
Fig. 1 is the schematic diagram that the communication means of traditional ambiguous path recognition system is shown;
Fig. 2 is the schematic diagram illustrated according to the communication means of the ambiguous path recognition system of the embodiment of the present invention;
Fig. 3 illustrates the flow chart of the method for communicating by letter with RSU according to OBU in the ambiguous path recognition system of the embodiment of the present invention.
Embodiment
Now the embodiment of the present invention is described in detail, in the accompanying drawings, wherein, identical label means identical parts to its example shown all the time.Below with reference to the accompanying drawings embodiment is described to explain the present invention.
Fig. 2 is the schematic diagram illustrated according to the communication means of the ambiguous path recognition system of the embodiment of the present invention.With reference to Fig. 2, the data center of ambiguous path recognition system for example, sends to road side base station (RSU) by the routing information in each section path (, Path Recognition code).RSU broadcast comprises the message of routing information and board units sign (OBU ID).OBU receives the message of RSU broadcast, and will comprise that the confirmation message of the OBUID of self sends to RSU.RSU upgrades original OBU ID according to the OBU ID received, and broadcast comprises the message of the OBU ID of routing information and renewal again, and the OBU ID that will receive uploads to the data center of ambiguous path recognition system.Data center's storing received of ambiguous path recognition system to OBU ID, the RSU identification information that receives the time of this OBU ID and upload this OBU ID.
The method of communicating by letter with RSU according to OBU in the ambiguous path recognition system of the embodiment of the present invention is described in more detail below with reference to Fig. 3.
Fig. 3 illustrates the flow chart of the method for communicating by letter with RSU according to OBU in the ambiguous path recognition system of the embodiment of the present invention.
According to the embodiment of the present invention, main micro-control unit (MCU) can be set and from MCU, radio frequency (RF) reflector and RF receiver and other be used to carrying out other communication modules wireless or wire communication in RSU.In OBU, can be provided with RF reflector and RF receiver and non-volatile memory cells.Selectively, OBU also can have other be used to carrying out the communication module of other radio communications.
With reference to Fig. 3, in operation S301, RSU broadcast comprises the broadcast of routing information and at least one OBU ID.Specifically, in RSU, control radio frequency (RF) reflector broadcast message from micro-control unit (MCU).Routing information in broadcast is provided by the data center of ambiguous path recognition system, and at least one the OBU ID in broadcast can be upgraded by RSU.Following table 1 shows the Frame of the message of RSU broadcast in traditional ambiguous path recognition system, and table 2 shows the Frame according to the broadcast of RSU in the ambiguous path recognition system of the embodiment of the present invention.In Frame according to the broadcast of RSU in the ambiguous path recognition system of the embodiment of the present invention, insert 4 OBU id fields, thereby can write 4 OBU ID.According to the embodiment of the present invention, each OBU ID is 4 bytes, and when RSU started, 4 OBU ID certificates can default setting be FFFF FF FF.Usually, the expressway safety spacing is 100m, and the RSU coverage is less than 100m.On the other hand, highway generally is at most unidirectional 4 tracks.Therefore, in embodiments of the present invention, the OBU id field in Frame is set to 4.Yet, the invention is not restricted to this, the quantity of the OBUID field in Frame (number of track-lines, host-host protocol etc.) is according to actual needs determined.
Table 1 conventional data frame
| Original position | Byte number | Signaling | Explanation |
| 1 | 1 | 0x09 | The Frame total length |
| 2 | 1 | 0x01 | Sequence of data frames number |
| 3 | 1 | 0x01 | The Frame sum |
| 4 | 2 | No. ID, RSU | |
| 6 | 1 | 0x02 | Command type |
| 7 | 2 | Data | Base station flag information (high byte is front, and low byte is rear) |
| 9 | 2 | CRC | Check code |
Table 2 is according to the Frame of the embodiment of the present invention
| Original position | Byte number | Signaling | Explanation |
| 1 | 1 | 0x19 | The Frame total length |
| 2 | 1 | 0x01 | Sequence of data frames number |
| 3 | 1 | 0x01 | The Frame sum |
| 4 | 2 | No. ID, RSU | |
| 6 | 1 | 0x02 | Command type |
| 7 | 2 | Data | Base station flag information (high byte is front, and low byte is rear) |
| 9 | 4 | OBU ID1 | OBU numbering 1 |
| 13 | 4 | OBU ID2 | OBU numbering 2 |
| 17 | 4 | OBU ID3 | OBU numbering 3 |
| 21 | 4 | OBU ID4 | OBU numbering 4 |
| 25 | 2 | CRC | Check code |
In table 1 and table 2, the quantity of the Frame that the Frame sum needs while meaning to send data, command type is to be the reserved field of expanded function, the sign of base station flag information indication RSU.By recording the sign of RSU, OBU just can registration of vehicle the path of process.
In operation S302, OBU receives the broadcast of RSU broadcast, record path information, and each at least one OBU ID that will receive compares with the OBU ID of himself respectively.Specifically, OBU can receive the broadcast of RSU broadcast by the RF receiver, by path information storage in non-volatile memory cells.
In operation S303, if determining at least one the OBU ID received, OBU has the OBU ID identical with the OBU ID of himself, and OBU determines successful record path information, and described method finishes.Now, OBU does not send any information.If OBU determines at least one the OBU ID received, do not have the OBU ID identical with the OBU ID of himself, method proceeds to operation S304.Here, owing to adopting the radio communication mode, so per second can carry out up to a hundred communication, thereby guaranteed that OBU communicates by letter reliably in the coverage of RSU.
In operation S304, OBU will comprise that the confirmation message of the OBU ID of self sends to RSU.Specifically, OBU can will comprise that the confirmation message of the OBU ID of self sends to RSU by the RF reflector.On the other hand, OBU also can be inserted into vehicles identifications information in described confirmation.Vehicles identifications information can comprise number-plate number, car plate color, vehicle of vehicle etc.When vehicle passes through expressway access, can vehicles identifications information be written in OBU and (for example, store in the non-volatile memory cells in OBU) by the keeper.Now, OBU can pass through its communication module or RF receiver, receives described vehicles identifications information with various communications.
In operation S305, RSU receives the confirmation message that OBU sends, the OBU ID comprised in the confirmation message that use receives upgrades an OBUID at least one the OBU ID comprised in broadcast, and the OBU ID comprised in the confirmation message that will receive uploads to the data center of ambiguous path recognition system.RSU also can record the time that receives the confirmation message that OBU sends, and the temporal information (that is, the call duration time of OBU stamp) that will comprise this time uploads to the data center of ambiguous path recognition system.Specifically, in RSU, main MCU controls the RF receiver and receives described acknowledge message, and this acknowledge message is sent to from MCU.Simultaneously, main MCU also can control other communication module, and the OBU ID comprised in the confirmation message that will receive in the mode of wireless or wire communication and the temporal information that comprises the time that receives the confirmation message upload to the data center of ambiguous path recognition system.Selectively, the vehicles identifications information comprised in the confirmation message that main MCU also can will receive by the mode of wireless or wire communication uploads to the data center of ambiguous path recognition system.On the other hand, from MCU, in first-in first-out (FIFO) mode, use the OBU ID comprised in the confirmation message received to upgrade the OBU ID comprised in broadcast.
Thereafter, method is returned to operation S301, thereby RSU can broadcast the broadcast of the OBUID that comprises routing information and renewal.
According to the embodiment of the present invention, the speed of a motor vehicle of the vehicle with certain OBU, the Real-time Traffic Informations such as vehicle flowrate of RSU position can calculate by the OBU ID uploaded and the temporal information that comprises the time that receives the confirmation message in the data center of ambiguous path recognition system.On the other hand, data center can also with vehicles identifications information and the temporal information that comprises the time that receives the confirmation message determine certain car when through information where.
As mentioned above, by in the message in RSU broadcast, inserting at least one OBU ID, make RSU to make feedback to the OBU that receives broadcast, OBU receives after own OBU ID and can determine that up acknowledge message received by RSU, authenticates mutually number of times thereby reduce.
The two-way handshake mechanism of question-response is adopted in existing two-way communication, and it expends time in longer, is unfavorable for the communication of hot-short under highway environment.In contrast to this, according to the embodiment of the present invention, can adopt the method for inserting OBU ID in broadcast, make OBU only need launch an acknowledge message and can complete communication, realize reliability and the speed of communication.
Although meaned and described some embodiments of the present invention, having it should be appreciated by those skilled in the art that and can modify to these embodiment in the situation that do not break away from principle of the present invention and the spirit that is limited its scope by claim and equivalent thereof.
Claims (10)
1. the method that in an ambiguous path recognition system, board units is communicated by letter with road side base station, described method comprises:
Road side base station broadcast comprises the broadcast of routing information and at least one board units sign;
Board units receives broadcast, the routing information comprised in recorded announce message, and each in described at least one board units sign comprised in broadcast identified and compare with self board units;
If board units confirms in described at least one board units sign not exist the board units sign identical with the board units sign of himself, the confirmation message that will comprise the board units sign of self sends to road side base station;
Road side base station confirmation of receipt message, use described at least one the board units sign of the board units identification renewal comprised in acknowledge message, and the board units comprised in acknowledge message is identified to the data center that uploads to described ambiguous path recognition system, wherein, a board units sign in described at least one board units sign is updated;
Road side base station broadcast comprises the broadcast of described at least one board units sign of routing information and renewal.
2. method according to claim 1, wherein, broadcast comprises 4 board units signs.
3. method according to claim 1, wherein, the length of described at least one board units sign is 4 bytes, and default setting is FF FF FF FF.
4. method according to claim 1, wherein, board units is recorded in the routing information comprised in broadcast in non-volatile memory cells.
5., wherein, there be the board units sign identical with the board units sign of himself if board units is confirmed described at least one board units in method according to claim 1 in identifying, and board units does not send acknowledge message.
6. method according to claim 1, wherein, acknowledge message also comprises the vehicles identifications information of the vehicle with this board units.
7. method according to claim 6, wherein, board units receives the vehicles identifications information of vehicle with communication.
8. method according to claim 6, wherein, road side base station uploads to the vehicles identifications information that comprises in acknowledge message and the temporal information that comprises the time that receives the confirmation message the data center of described ambiguous path recognition system.
9. method according to claim 1, wherein, road side base station upgrades described at least one board units sign in the first-in first-out mode.
10. method according to claim 8, wherein, the data center of described ambiguous path recognition system identifies and comprises the temporal information of the time that receives the confirmation message with the board units of uploading and calculates the speed of a motor vehicle of the vehicle with this board units and the vehicle flowrate of road side base station position.
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Families Citing this family (11)
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| CN102956038B (en) * | 2011-08-31 | 2016-09-21 | 深圳光启智能光子技术有限公司 | Vehicle management system based on RF identification |
| CN102622787B (en) * | 2012-04-09 | 2015-05-20 | 中兴通讯股份有限公司 | Communication method and communication device for electronic toll collection (ETC) system |
| ES2524148T3 (en) * | 2012-05-03 | 2014-12-04 | Kapsch Trafficcom Ag | Procedure and devices for the identification of a vehicle that uses a place |
| CN103390346B (en) * | 2012-05-09 | 2015-11-18 | 航天信息股份有限公司 | A kind of ambiguity path identifying system with transport information statistical function |
| CN103391514B (en) * | 2012-05-09 | 2016-06-29 | 航天信息股份有限公司 | A kind of method that board units communicates with trackside antenna equipment |
| CN103632399A (en) * | 2012-08-24 | 2014-03-12 | 深圳市金溢科技有限公司 | Ambiguous path information processing method, on board unit, on desk unit and system |
| CN104517321A (en) * | 2013-10-08 | 2015-04-15 | 航天信息股份有限公司 | Method and system allowing road side unit and on board unit to perform data communication |
| CN103730014B (en) * | 2013-10-29 | 2017-03-08 | 深圳市金溢科技股份有限公司 | A kind of statistical method of traffic flow based on ambiguous path identifying system and system |
| CN105991181B (en) * | 2015-02-15 | 2019-03-26 | 深圳市金溢科技股份有限公司 | Path Recognition wireless communications method, mark antenna and mark terminal based on 5.8GHz DSRC |
| CN105741366B (en) * | 2015-12-17 | 2019-01-15 | 深圳市金溢科技股份有限公司 | A kind of anti-interference with vehicle method of commerce, roadside unit and transaction system |
| CN114697910A (en) * | 2020-12-25 | 2022-07-01 | 株式会社电装 | Unicast communication method and device for Internet of vehicles |
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