CN102104400A - 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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- CN102104400A CN102104400A CN2011100382290A CN201110038229A CN102104400A CN 102104400 A CN102104400 A CN 102104400A CN 2011100382290 A CN2011100382290 A CN 2011100382290A CN 201110038229 A CN201110038229 A CN 201110038229A CN 102104400 A CN102104400 A CN 102104400A
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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 board units and road side base station method for communicating in a kind of highway ambiguous path recognition system.
Background technology
The path ambiguity is meant that mainly there is a more than driving path in vehicle from any to another point in freeway net.Discern a difficult problem in this expressway network toll at ambiguous path, relevant enterprise has also proposed various solutions at present, comprising the ambiguous path recognition system of utilization radio-frequency (RF) identification (RFID) technology.
As described in CN201054714Y number Chinese utility model patent, the ambiguous path recognition system can be made up of road side base station (RSU), track card reader and board units (OBU).Different highway sections are provided with 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 inlet information by the track card reader, gives the driver OBU then; When vehicle during in travels down, the OBU in the car can receive the Path Recognition sign indicating number that RSU sends, and is kept in the 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 among the OBU in the 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 with the Path Recognition sign indicating number in each section path, and RSU broadcasting comprises the message of the Path Recognition sign indicating number in this section path, and OBU receives this message, and the store path identification code.Yet,, communicate by letter for One-to-All Broadcast between RSU and the OBU in aforesaid ambiguous path recognition system.That is to say that 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 the board units and road side base station that can realize in the ambiguous path recognition system.
Summary of the invention
To be partly articulated other aspect of the present invention and/or advantage in the following description, by describing, it can become clearer, perhaps can understand by implementing the present invention.
According to an aspect of the present invention, provide board units and road side base station method for communicating in a kind of ambiguous path recognition system, described method comprises: road side base station broadcasting comprises the broadcast of routing information and at least one board units sign; Board units receives broadcast, the routing information that comprises in the recorded announce message, and in described at least one board units sign that comprises in the broadcast each identified with self board units compare; If board units is confirmed not have the board units sign identical with the board units sign of himself in described at least one board units sign, the affirmation message that then 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 that comprises in the acknowledge message, and the board units that comprises in acknowledge message sign is uploaded to the data center of described ambiguous path recognition system, wherein, a board units sign in described at least one board units sign is updated; Road side base station broadcasting 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 that comprises in the broadcast in the non-volatile memory cells.
In addition, if board units is confirmed to have the board units sign identical with the board units sign of himself in described at least one board units sign, then 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 the 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 uses the board units sign of uploading and comprises the temporal information of the time that receives the confirmation message 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.
Description of drawings
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 that illustrates according to the communication means of the ambiguous path recognition system of the embodiment of the invention;
Fig. 3 illustrates the flow chart according to OBU and RSU method for communicating in the ambiguous path recognition system of the embodiment of the invention.
Embodiment
Now the embodiment of the invention is described in detail, its example shown in the accompanying drawings, wherein, identical label is represented identical parts all the time.Below with reference to the accompanying drawings embodiment is described to explain the present invention.
Fig. 2 is the schematic diagram that illustrates according to the communication means of the ambiguous path recognition system of the embodiment of the invention.With reference to Fig. 2, the data center of ambiguous path recognition system sends to road side base station (RSU) with the routing information (for example, Path Recognition sign indicating number) in each section path.RSU broadcasting comprises the message of routing information and board units sign (OBU ID).OBU receives the message of RSU broadcasting, and will comprise that the affirmation message of the OBUID of self sends to RSU.RSU upgrades original OBU ID according to the OBU ID that receives, and broadcasting comprises the message of the OBU ID of routing information and renewal again, and the OBU ID that receives is uploaded to the data center of ambiguous path recognition system.The OBU ID that data center's storage of ambiguous path recognition system receives, the RSU identification information that receives the time of this OBU ID and upload this OBU ID.
Describe in more detail according to OBU and RSU method for communicating in the ambiguous path recognition system of the embodiment of the invention below with reference to Fig. 3.
Fig. 3 illustrates the flow chart according to OBU and RSU method for communicating in the ambiguous path recognition system of the embodiment of the invention.
According to the embodiment of the invention, main micro-control unit (MCU) can be set among the RSU and carry out other communication modules wireless or wire communication from MCU, radio frequency (RF) reflector and RF receiver and other being used to.Can be provided with RF reflector and RF receiver and non-volatile memory cells among the OBU.Selectively, OBU also can have the other communication module that is used to carry out other radio communications.
With reference to Fig. 3, in operation S301, RSU broadcasting comprises the broadcast of routing information and at least one OBU ID.Specifically, in RSU, from micro-control unit (MCU) control radio frequency (RF) reflector broadcast message.Routing information in the broadcast is provided by the data center of ambiguous path recognition system, and at least one the OBU ID in the broadcast can be upgraded by RSU.Following table 1 shows the Frame of the message of RSU broadcasting 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 invention.Insert 4 OBU id fields in the Frame according to the broadcast of RSU in the ambiguous path recognition system of the embodiment of the invention, thereby can write 4 OBU ID.According to the embodiment of the 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 the Frame is set to 4.Yet, the invention is not restricted to this, the quantity of the OBUID field in the 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 | RSU ID number | |
| 6 | 1 | 0x02 | Command type |
| 7 | 2 | Data | Base station flag information (high byte is preceding, and low byte is in the back) |
| 9 | 2 | CRC | Check code |
Table 2 is according to the Frame of the embodiment of the 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 | RSU ID number | |
| 6 | 1 | 0x02 | Command type |
| 7 | 2 | Data | Base station flag information (high byte is preceding, and low byte is in the back) |
| 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 expression of Frame sum needs when sending data, command type is the field of reserving for expanded function, the sign of base station flag information indication RSU.By the sign of record RSU, OBU just can registration of vehicle the path of process.
In operation S302, OBU receives the broadcast of RSU broadcasting, record path information, and among at least one OBU ID that will receive each compares with himself OBU ID respectively.Specifically, OBU can receive the broadcast of RSU broadcasting by the RF receiver, with path information storage in non-volatile memory cells.
In operation S303, if there be the OBU ID identical with the OBU ID of himself among at least one OBU ID that OBU determines to receive, then OBU determines successful record path information, and described method finishes.At this moment, OBU does not send any information.If there be not the OBU ID identical with the OBU ID of himself among at least one OBU ID that OBU determines to receive, then method changes operation S304 over to.Here, owing to adopt the radio communication mode, so per second can carry out up to a hundred communication, thereby guaranteed that OBU communicates by letter in the coverage of RSU reliably.
In operation S304, OBU will comprise that the affirmation message of the OBU ID of self sends to RSU.Specifically, OBU can will comprise that the affirmation 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 the described confirmation.Vehicles identifications information can comprise number-plate number, car plate color, vehicle of vehicle etc.When vehicle when the expressway access, can vehicles identifications information be written among the OBU by the keeper (for example, storing in the non-volatile memory cells among the OBU).At this moment, OBU can pass through its communication module or RF receiver, receives described vehicles identifications information with various communications.
In operation S305, RSU receives the affirmation message that OBU sends, the OBU ID that comprises in the affirmation message that use receives upgrades an OBUID among at least one the OBU ID that comprises in the broadcast, and the OBU ID that comprises in the affirmation message that will receive uploads to the data center of ambiguous path recognition system.But RSU is the time of the affirmation message that sends to OBU of recorder also, and the temporal information (that is, the call duration time of OBU stabs) that will comprise this time uploads to the data center of ambiguous path recognition system.Specifically, in RSU, main MCU control RF receiver receives described acknowledge message, and this acknowledge message is sent to from MCU.Simultaneously, main MCU is the other communication module of may command also, and OBU ID that comprises in the affirmation 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 uploading that comprises in the affirmation message that main MCU also can will receive by the mode of wireless or wire communication is to the data center of ambiguous path recognition system.On the other hand, in first-in first-out (FIFO) mode, use the OBU ID that comprises in the affirmation message that receives to upgrade the OBU ID that comprises in the broadcast from MCU.
Thereafter, method return S301, thus RSU can broadcast the broadcast of the OBUID that comprises routing information and renewal.
According to the embodiment of the invention, the data center of ambiguous path recognition system can use the OBU ID that uploads and calculate the speed of a motor vehicle of the vehicle with certain OBU, the Real-time Traffic Informations such as vehicle flowrate of RSU position the temporal information that comprises the time that receives the confirmation message.On the other hand, the data center's temporal information that can also use vehicles identifications information and comprise the time that receives the confirmation message determine certain car when through information where.
As mentioned above, by in the message of RSU broadcasting, inserting at least one OBU ID, make RSU to make feedback to the OBU that receives broadcast, OBU receives and can determine that up acknowledge message received by RSU behind the own OBU ID, authenticates number of times mutually 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 the highway environment.In contrast to this,, can adopt the method for in broadcast, inserting OBU ID, make OBU only need launch an acknowledge message and can finish communication, realize the reliability and the speed of communication according to the embodiment of the invention.
Though represented and described some embodiments of the present invention, it should be appreciated by those skilled in the art that under the situation that does not break away from the principle of the present invention that limits its scope by claim and equivalent thereof and spirit, can make amendment to these embodiment.
Claims (10)
1. board units and road side base station method for communicating in the ambiguous path recognition system, described method comprises:
Road side base station broadcasting comprises the broadcast of routing information and at least one board units sign;
Board units receives broadcast, the routing information that comprises in the recorded announce message, and in described at least one board units sign that comprises in the broadcast each identified with self board units compare;
If board units is confirmed not have the board units sign identical with the board units sign of himself in described at least one board units sign, the affirmation message that then 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 that comprises in the acknowledge message, and the board units that comprises in acknowledge message sign is uploaded to the data center of described ambiguous path recognition system, wherein, a board units sign in described at least one board units sign is updated;
Road side base station broadcasting 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 that comprises in the broadcast in the non-volatile memory cells.
5. method according to claim 1, wherein, if board units is confirmed to have the board units sign identical with the board units sign of himself in described at least one board units sign, then 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 the 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 uses the board units sign of uploading and comprises the temporal information of the time that receives the confirmation message 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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| 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 |
| CN103730014A (en) * | 2013-10-29 | 2014-04-16 | 深圳市金溢科技有限公司 | Traffic flow statistical method and system based on ambiguity path recognition system |
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| CN105991181A (en) * | 2015-02-15 | 2016-10-05 | 深圳市金溢科技股份有限公司 | 5.8GHz DSRC-based path recognition wireless communication method, identification antenna and identification terminal |
| 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 |
| CN105741366A (en) * | 2015-12-17 | 2016-07-06 | 深圳市金溢科技股份有限公司 | Anti-car following disturbing transaction method, road side unit, and transaction system |
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| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Luo Ruifa Inventor after: Liu Yongping Inventor after: Wu Hengzhi Inventor after: Wu Jiayi Inventor after: Xu Genhua Inventor after: Liu Yu Inventor after: Liao Yongping Inventor after: He Shouyong Inventor after: Yang Cheng Inventor before: Xu Genhua Inventor before: Liu Yu Inventor before: Liao Yongping Inventor before: He Shouyong Inventor before: Yang Cheng |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: XU GENHUA LIU YU LIAO YONGPING HE SHOUYONG YANG CHENG TO: LUO RUIFA LIU YONGPING WU HENGZHI WU JIAYI XU GENHUA LIU YU LIAO YONGPING HE SHOUYONG YANG CHENG |