CN110996267A - Method and device for identifying OBU - Google Patents
Method and device for identifying OBU Download PDFInfo
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- CN110996267A CN110996267A CN201911256627.2A CN201911256627A CN110996267A CN 110996267 A CN110996267 A CN 110996267A CN 201911256627 A CN201911256627 A CN 201911256627A CN 110996267 A CN110996267 A CN 110996267A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B15/00—Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
- G07B15/06—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
- G07B15/063—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems using wireless information transmission between the vehicle and a fixed station
Abstract
The invention provides a method and a device for identifying an OBU (on-board unit), wherein the method comprises the following steps: the method comprises the steps that a Road Side Unit (RSU) broadcasts a first BST message in a target area according to a first downlink time window, VST response signals replied by a plurality of OBUs are received in the uplink time window, and when the VST response signals received by the RSU are scrambled, the RSU starts to broadcast a second BST message according to a second downlink time window. Because the second downlink time window is smaller than the first downlink time window, when the second downlink time window is finished, a part of OBUs do not successfully reply the VST response signal in the uplink time window, the part of OBUs cannot receive the third BST message, and the number of the OBUs receiving the third BST message is reduced, so that the number of the VST response messages replied in the same uplink time window is reduced, the probability of collision of the VST response messages replied by the OBUs, and the success rate of information communication is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for identifying an OBU.
Background
An Electronic Toll Collection (ETC) system is an Electronic automatic Toll Collection system, and comprises a Road Side Unit (RSU) and an On Board Unit (OBU), wherein the RSU and the OBU are communicated by a Dedicated Short Range Communication (DSRC) technology to complete vehicle traffic information delivery, and a lane computer is used for completing deduction operation of an Electronic wallet or a bank account in an integrated circuit (integrated circuit, Short for Short) IC card, so that non-cash payment is realized.
In the ETC system, the OBU is an embedded processing unit mounted on a traveling vehicle, and the RSU is a fixed communication device mounted at a specified place (beside a lane, above the lane, etc.), and is controlled by a lane computer. In the communication process of the RSU and the OBU, the RSU is an initiator, the OBU is a slave, and the OBU can only respond to a command sent by the RSU. The RSU broadcasts a Beacon Service Table (BST) periodically in a downlink time interval through a communication link, and all OBUs entering an active transmission area of the RSU receive the BST. After the OBU successfully receives the BST, a corresponding Vehicle Service Table (VST) is replied as a response in an uplink time interval, and then the connection is established between the current RSU and the OBU. If a plurality of OBUs exist in the RSU effective transmission area, in the same uplink time interval, VSTs replied by the plurality of OBUs may have signal collision, thereby causing VST transmission failure.
In the prior art, the uplink time interval for replying the VST is divided into a plurality of sub-time intervals by the OBU, so that the quantity of the VST replying messages received by the OBU at the same time can be reduced, and the probability of signal collision is reduced.
However, when the number of the OBUs in the RSU transmitting area reaches a certain level, even if a method of several small time intervals is adopted, signal collision interference still exists when a plurality of OBUs reply the VST at the same time, and the success rate of information transaction is reduced.
Disclosure of Invention
The invention provides a method and a device for identifying OBUs (on-board units), which are used for solving the problem of signal collision when multiple OBUs reply VST response information in the same uplink time interval when the multiple OBUs simultaneously receive BST information broadcasted by an RSU (remote subscriber unit).
In a first aspect, an embodiment of the present invention provides a method for identifying an OBU, where the method is applied to a road side unit RSU, and includes:
broadcasting a first BST message in a target area according to a first downlink time interval, wherein the target area comprises a plurality of on-board units (OBUs);
receiving VST response signals returned by the plurality of OBUs according to the first BST messages in an uplink time interval according to preset batches, wherein the first downlink time interval is equal to the uplink time interval of the returned VST response signals;
determining the number of OBUs responding in the uplink time interval according to the VST response signal returned in the uplink time interval;
when the number of the OBUs responding in the uplink time interval exceeds a preset threshold value, broadcasting a second BST message according to a second downlink time interval, wherein the second downlink time interval is smaller than the first downlink time interval;
receiving VST response signals returned by the OBUs according to the second BST messages in the uplink time interval according to the preset batches, and broadcasting a third BST message when the second downlink time interval passes;
and receiving the VST response signal returned by the OBU which has finished responding to the BST message according to the preset batch, and continuously executing the step of broadcasting the next BST message when the second downlink time interval passes.
In one possible design, the method further includes:
and broadcasting a second BST message according to the first downlink time interval when the number of the OBUs responding in the uplink time interval does not exceed a preset threshold value.
In one possible design, the predetermined batch is a time window that divides the uplink time interval into a predetermined number of sub-time windows.
In one possible design, the determining the number of OBUs responded in the upstream time interval according to the VST response signal returned in the upstream time interval includes:
and determining the number of the OBUs responding in the uplink time interval according to the number of the returned VST response signals.
In a second aspect, the present invention provides an apparatus for identifying an OBU, comprising:
the system comprises a broadcasting module, a receiving module and a sending module, wherein the broadcasting module is used for broadcasting a first BST message in a target area according to a first downlink time interval, and the target area comprises a plurality of on-board units (OBUs);
a receiving module, configured to receive VST response signals returned by the plurality of OBUs according to the first BST messages in an uplink time interval according to a preset batch, where the first downlink time interval is equal to an uplink time interval of the returned VST response signals;
the determining module is used for determining the number of OBUs responding in the uplink time interval according to the VST response signal returned in the uplink time interval;
the broadcasting module is further configured to broadcast a second BST message according to a second downlink time interval when the number of the OBUs responded in the uplink time interval exceeds a preset threshold, where the second downlink time interval is smaller than the first downlink time interval;
the receiving module is further configured to receive VST response signals returned by the plurality of OBUs according to the preset batch within an uplink time interval according to the second BST message, and broadcast a third BST message when the second downlink time interval elapses;
the receiving module is further configured to receive the VST response signal returned by the OBU that has completed responding to the BST message according to the preset batch, and continue to perform the step of broadcasting the next BST message when the second downlink time interval elapses.
In one possible design, the broadcasting module is further configured to broadcast a second BST message according to the first downlink time interval when the number of OBUs responding in the uplink time interval does not exceed a preset threshold.
In one possible design, the predetermined batch is a time window that divides the uplink time interval into a predetermined number of sub-time windows.
In one possible design, the determining module is specifically configured to determine the number of OBUs responding in the upstream time interval according to the number of VST response signals returned.
In a third aspect, an embodiment of the present invention provides an apparatus for identifying an OBU, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of identifying an OBU according to any of the first aspects.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, in which computer-executable instructions are stored, and when a processor executes the computer-executable instructions, the method for identifying an OBU according to any one of the first aspect is implemented.
The method for identifying the OBUs comprises the steps that after a RSU broadcasts a first BST message in a target area according to a first downlink time window, VST response signals corresponding to the first BST message returned by a plurality of OBUs in the uplink time window are received, when the number of the VST response signals received by the RSU and replied by the RSU exceeds a preset threshold value, the RSU is considered to have at least the number of the OBUs with the preset threshold value in the target area, and then the RSU starts to broadcast a second BST message according to a second downlink time window. Because the second downlink time window is smaller than the first downlink time window, when the second time window broadcasting the second BST message ends, a part of OBUs do not successfully reply to the VST response signal corresponding to the second BST in the uplink time window, and the part of OBUs cannot receive the third BST message broadcasted by the RSU, the number of OBUs receiving the third BST message and the number of VST response messages replying the third BST message are reduced, so that the number of VST response messages replied in the same uplink time window is reduced, the probability of collision of multiple OBUs replying the VST response messages is reduced, and the success rate of information communication is further improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic view of a scene of an Electronic Toll Collection (ETC) system;
fig. 2 is a schematic diagram of an OBU initialization flow;
fig. 3 is a flowchart of a method for identifying an OBU according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a downlink time window and an uplink time window provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for identifying an OBU according to an embodiment of the present invention;
fig. 6 is a schematic hardware structure diagram of an apparatus for identifying an OBU according to an embodiment of the present invention.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Fig. 1 is a schematic view of a scene of an Electronic Toll Collection (ETC) system, as shown in fig. 1: the electronic toll collection ETC system comprises an electronic toll collection front-end system and an electronic toll collection background clearing and service system, wherein the electronic toll collection front-end system comprises a Road Side Unit (RSU) and an on-board unit (OBU). The RSU is a fixed communication device installed at a designated place (e.g., beside a lane, above a lane, etc.), and the OBU is an embedded processing unit installed on a vehicle. The dedicated short range communication technology DSRC used between the RSU and the OBU establishes a connection, wherein the network coverage radius of the DSRC is 3-30 m.
The RSU broadcasts the BST message circularly according to a certain time interval, when a vehicle carrying the OBU enters a range covered by the RSU, the RSU receives the BST message broadcasted by the RSU and replies the VST response message, and at the moment, the OBU enters a wake-up mode from a sleep mode to complete the initialization function of communication. After the RSU and the OBU establish communication, the RSU acquires vehicle information of the OBU and transmits the vehicle information to the lane computer to verify the validity of the information, and after the lane computer authenticates that the OBU is legal, the lane computer transmits IC card information of the OBU to an electronic charging background clearing and service system to complete a fee deduction process.
Fig. 2 is a schematic diagram of an initialization process of an OBU, and as shown in fig. 2, the process of the OBU from a sleep mode to an awake mode is as follows:
s201: the RSU broadcasts the BST message phase.
The RSU broadcasts BST messages cyclically at certain time intervals within a downlink time window within the range of a DSRC active network.
S202: and the OBU replies a VST response message phase.
And if the OBU enters the coverage of the RSU for the first time and receives the BST message broadcasted by the RSU, the OBU replies the VST response message in the uplink time window corresponding to the BST. After the RSU successfully receives the VST message, the DSRC-specific communication link between the OBU and the RSU is deemed to be successfully established. And the OBU enters the wake-up mode from the sleep mode, and the initialization of the OBU is completed.
In a multi-lane ETC system, there is inevitably a case where at least one or more OBUs are simultaneously in the RSU coverage, which easily causes a signal collision phenomenon in VST response messages returned by a plurality of OBUs. In the prior art, the uplink time window for replying the VST is divided into a plurality of sub-time windows by the OBU, so that the quantity of VST replying messages received by the OBU at the same time can be reduced, and the probability of signal collision is reduced. The vehicle-mounted unit comprises a random number generator, and the vehicle-mounted unit selects the VST response signal returned in the uplink time interval according to the random number generated by the random number generator. However, when the number of the OBUs in the RSU transmitting area reaches a certain level, even if a method of a plurality of time small windows is adopted, signal collision interference still exists when a plurality of OBUs reply to the VST at the same time, and the success rate of information transaction is reduced. The invention provides a method for identifying OBUs, and aims to solve the problem of signal collision interference when a plurality of OBUs reply VSTs at the same time.
The following describes the technical solutions of the present invention and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 3 is a flowchart of a method for identifying an OBU according to an embodiment of the present invention, and as shown in fig. 3, the method of this embodiment may include the following steps:
s301: and broadcasting the first BST message in a target area according to a first downlink time window, wherein the target area comprises a plurality of on-board units (OBUs).
The target area is the DSRC effective network range of the RSU. The RSU broadcasts BST messages within the target area cyclically at time intervals defined by a first downlink time window. When a plurality of OBUs enter the coverage area of the RSU, a first BST message broadcasted by the RSU at a starting node of a first downlink time window is received. Due to the different positions of the plurality of OBUs, the specific time node of the first BST message received by the OBU is also different.
S302: and receiving VST response signals returned by a plurality of OBUs according to the first BST message in an uplink time window according to preset batches.
After the plurality of OBUs in the target area receive the first BST message, the plurality of OBUs reply VST response information in an uplink time window corresponding to the first BST. As shown in fig. 4, fig. 4 is a schematic diagram of a downlink time window and an uplink time window provided in the embodiment of the present invention, where a window time of a first downlink time window is equal to a window time of a first uplink time window. In fig. 4, the uplink time window corresponding to the first BST is divided into 3 equal uplink time sub-windows by the OBUs, and the multiple OBUs reply VST response information according to a preset batch set by the multiple uplink sub-windows.
As shown in fig. 4, for example, the number of the OBUs currently entering the RSU target area is 60, where the 60 OBUs are labeled as nos. 1 to 60, and the 60 OBUs divide the uplink time window 3 into equal parts, that is, into the first uplink sub-window, the second uplink sub-window, and the third uplink sub-window, then the 60 OBUs reply the VST response information corresponding to the first BST message according to the preset batch set by the multiple uplink sub-windows, it can be considered that 20 OBUs of nos. 1 to 20 reply the VST response information in the first uplink sub-window, 20 OBUs of nos. 21 to 40 reply the VST response information in the second uplink sub-window, and 20 OBUs of nos. 41 to 60 reply the VST response information in the third uplink sub-window.
S303: and determining the number of the OBUs responding in the uplink time window according to the VST response signal returned in the uplink time window.
If the number of the VSTs received by the current RSU is 60, it is determined that at least 60 OBUs enter the target region, and at least 60 OBUs respond to the first BST message broadcast by the RSU within the uplink time window.
S304: and when the number of the OBUs responding to the uplink time window exceeds a preset threshold value, broadcasting a second BST message according to a second downlink time window, wherein the second downlink time window is smaller than the first downlink time window.
When the number of OBUs entering the RSU target area is large, the number of VST response messages corresponding to the first BST message replied in the uplink time window is also increased, and there may be a problem that signal collision occurs in the VST response messages replied by a plurality of OBUs in the uplink time window. And setting a preset threshold according to the maximum value of the VST response information processed by the RSU, and when the RSU receives that the number of the VSTs replied in the target area is greater than or equal to the preset threshold, determining that at least OBUs with the preset threshold number exist in the current target area, wherein the VST response information replied by the OBUs with the preset threshold number is likely to have a signal collision problem. For example, if the maximum number of reply CST response messages processed by the current RSU within the uplink time window period is 60, the preset threshold is set to 60. When the number of the VST response messages received by the RSU is greater than or equal to 60, it may be considered that more than 60 OBUs enter the coverage of the RSU, and when these OBUs reply the VST response messages in three uplink sub-windows, there is a high possibility that a signal collision occurs, that is, the RSU may not receive the VST response message corresponding to the first BST replied by a part of the OBUs.
In one implementation, when the RSU receives that the number of VSTs replied in the target region is greater than or equal to the preset threshold number, the RSU broadcasts a second BST message at the start time node of a second downlink time window according to the time interval of the second downlink time window, and sets the window time of the second downlink time window to be less than the first downlink window time. As shown in fig. 4, for example, if the window time of the first downlink time window is 10ms, the window time of the second downlink time window is 9 ms. The window time of the uplink time window is equal to the first downlink time window, the OBU divides the uplink time window into 3 sub-windows, and the window time of each time sub-window is 10/3 ms. Since the window time of the uplink time window is equal to the window time of the first downlink time window, and the window time of the second downlink time window is less than the window time of the first time window, the window time of the second downlink time window is less than the window time of the uplink time window.
In another implementation, if the RSU receives that the number of VSTs replied in the target region is smaller than the preset threshold number, it may be considered that the number of OBUs responded in the uplink time window does not exceed the preset threshold number, and the RSU still broadcasts the second BST message according to the time interval of the first downlink time window.
S305: and receiving VST response signals returned by a plurality of OBUs according to the second BST message in an uplink time window according to preset batches, and broadcasting a third BST message when the second downlink time window passes.
When the RSU receives VST response messages greater than or equal to the preset threshold number, it may be considered that the number of OBUs in the target area of the current RSU exceeds the preset threshold, and when the RSU broadcasts the second BST message, the second BST message is received by the OBUs whose number exceeds the preset threshold. And after the RSU broadcasts the second BST, the RSU broadcasts a third BST message to the OBUs with the number exceeding the preset threshold value in the target area according to the time interval of the second downlink time window.
S306: and receiving VST response signals returned by the OBUs which have finished responding to the BST messages according to the preset batch, and re-executing the step of broadcasting the next BST message when the second downlink time window passes.
In S304, the RSU broadcasts the second BST message to the OBUs exceeding the preset threshold number in the target region according to the time interval of the second downlink time window, and in S305, the OBUs exceeding the preset threshold number reply the VST response information corresponding to the second BST message in the three uplink sub-windows. As shown in fig. 4, when the RSU broadcasts the third BST message according to the time interval of the second downlink time window, since the window time of the second downlink time window is less than the window time of the uplink time window, when the third BST message is broadcast, there is a portion of VST corresponding information corresponding to the second BST replied by the OBU, which has not been successfully transmitted to the RSU in the uplink time sub-window, and this portion of OBUs that have not successfully replied the VST response information cannot receive the third BST message, and the number of OBUs that reply the third BST message is less than the number of OBUs that reply the second BST message.
For example, in step S304, there are more than 60 OBUs in the target range, and the RSU receives that the number of VST response messages corresponding to the first BST message is 60, that is, the number of OBUs replied in 3 uplink sub-windows is 60, and it can be considered that the number of OBUs replied in each uplink sub-window is 20. When the RSU broadcasts the second BST message at a time interval of 9ms according to the second downlink time window, when the second downlink time window is over, the first uplink sub-window and the second uplink sub-window are over, and the third uplink sub-window does not reach the end time, it can be considered that 40 OBUs successfully reply the VST response information corresponding to the second BST in the target region, and 20 OBUs unsuccessfully reply the VST response information corresponding to the second BST. The OBU can receive the next broadcast BST only after successfully replying the corresponding information of the VST corresponding to the previous BST message. Therefore, in this step, since 20 OBUs have failed to successfully reply the VST response message corresponding to the second BST message, the 20 OBUs cannot receive the third BST message broadcasted by the RSU, and only 40 OBUs that successfully reply the second BST message in the first uplink sub-window and the second uplink sub-window can receive the third BST message broadcasted. The number of the OBUs currently replying the third BST message is reduced to 40, and the number of the corresponding VST response messages replying the third BST in the three uplink sub-windows is reduced to 40, so that the number of the VSTs replying in the uplink time window is reduced, and the probability of collision of the multiple OBUs replying the VST response messages is reduced.
As can be seen from this embodiment, after the RSU broadcasts the first BST message in the target region according to the first downlink time window, the RSU receives VST response signals corresponding to the first BST message returned by the plurality of OBUs in the uplink time window, and when the RSU receives the VST response signals in which the number of the replied VST response signals exceeds the preset threshold, it is determined that at least the OBUs with the preset threshold number exist in the target region, the RSU starts to broadcast the second BST message according to the second downlink time window. Because the second downlink time window is smaller than the first downlink time window, when the second time window broadcasting the second BST message ends, a part of OBUs do not successfully reply to the VST response signal corresponding to the second BST in the uplink time window, and the part of OBUs cannot receive the third BST message broadcasted by the RSU, the number of OBUs receiving the third BST message and the number of VST response messages replying the third BST message are reduced, so that the number of VST response messages replied in the same uplink time window is reduced, the probability of information collision and information scrambling code in the VST response replied by a plurality of OBUs is reduced, and the success rate of information communication is improved.
Fig. 5 is a schematic structural diagram of an apparatus for identifying an OBU according to an embodiment of the present invention. As shown in fig. 5, the OBU identifying device 50 includes: a broadcast module 501, a receiving module 501 and a determination module 503.
A broadcasting module 501, configured to broadcast a first BST message according to a first downlink time window in a target area, where the target area includes a plurality of on-board units (OBUs);
a receiving module 502, configured to receive VST response signals returned by the plurality of OBUs according to the first BST messages in an uplink time window according to a preset batch, where the first downlink time window is equal to an uplink time window of the returned VST response signals;
a determining module 503, configured to determine, according to the VST response signal returned in the uplink time window, the number of OBUs responded in the uplink time window;
the broadcasting module 501 is further configured to broadcast a second BST message according to a second downlink time window when the number of the OBUs responded in the uplink time window exceeds a preset threshold, where the second downlink time window is smaller than the first downlink time window;
the receiving module 502 is further configured to receive VST response signals returned by the plurality of OBUs according to the second BST message in the uplink time window according to the preset batch, and broadcast a third BST message when the second downlink time window passes;
the receiving module 502 is further configured to receive the VST response signal returned by the OBU that has completed responding to the BST message according to the preset batch, and continue to perform the step of broadcasting the next BST message when the second downlink time window elapses.
In one possible design, the broadcasting module 501 is further configured to broadcast the second BST message according to the first downlink time window when the number of OBUs responding within the uplink time window does not exceed a preset threshold.
In one possible design, the predetermined batch is a time window obtained by dividing the uplink time window into a predetermined number of sub-time windows.
In one possible design, the determining module 503 is specifically configured to determine the number of OBUs responding within the uplink time window according to the number of VST response signals returned.
The apparatus provided in this embodiment may be used to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
Fig. 6 is a schematic hardware structure diagram of an apparatus for identifying an OBU according to an embodiment of the present invention.
As shown in fig. 6, the apparatus 60 for identifying an OBU of the present embodiment includes: a processor 601 and a memory 602; wherein:
a memory 602 for storing computer-executable instructions;
the processor 601 is configured to execute the computer execution instructions stored in the memory to implement the steps performed by the RSU in the above embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
In one possible design, the memory 602 may be separate or integrated with the processor 601.
When the memory 602 is provided separately, the OBU identifying device further comprises a bus 603 for connecting said memory 602 and the processor 601.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer executing instruction is stored in the computer-readable storage medium, and when a processor executes the computer executing instruction, the method for identifying an OBU as described above is implemented.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (enhanced Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for identifying an OBU, wherein the method is applied to a Road Side Unit (RSU), and comprises the following steps:
broadcasting a first BST message in a target area according to a first downlink time interval, wherein the target area comprises a plurality of on-board units (OBUs);
receiving VST response signals returned by the plurality of OBUs according to the first BST messages in an uplink time interval according to preset batches, wherein the first downlink time interval is equal to the uplink time interval of the returned VST response signals;
determining the number of OBUs responding in the uplink time interval according to the VST response signal returned in the uplink time interval;
when the number of the OBUs responding in the uplink time interval exceeds a preset threshold value, broadcasting a second BST message according to a second downlink time interval, wherein the second downlink time interval is smaller than the first downlink time interval;
receiving VST response signals returned by the OBUs according to the second BST messages in the uplink time interval according to the preset batches, and broadcasting a third BST message when the second downlink time interval passes;
and receiving the VST response signal returned by the OBU which has finished responding to the BST message according to the preset batch, and continuously executing the step of broadcasting the next BST message when the second downlink time interval passes.
2. The method of claim 1, further comprising:
and broadcasting a second BST message according to the first downlink time interval when the number of the OBUs responding in the uplink time interval does not exceed a preset threshold value.
3. The method of claim 1, wherein the predetermined batch is a time window dividing the uplink time interval into a predetermined number of sub-time windows.
4. The method of claim 1, wherein said determining the number of OBUs responded to in an upstream time interval from VST response signals returned in said upstream time interval comprises:
and determining the number of the OBUs responding in the uplink time interval according to the number of the returned VST response signals.
5. An apparatus for identifying an OBU, comprising:
the system comprises a broadcasting module, a receiving module and a sending module, wherein the broadcasting module is used for broadcasting a first BST message in a target area according to a first downlink time interval, and the target area comprises a plurality of on-board units (OBUs);
a receiving module, configured to receive VST response signals returned by the plurality of OBUs according to the first BST messages in an uplink time interval according to a preset batch, where the first downlink time interval is equal to an uplink time interval of the returned VST response signals;
the determining module is used for determining the number of OBUs responding in the uplink time interval according to the VST response signal returned in the uplink time interval;
the broadcasting module is further configured to broadcast a second BST message according to a second downlink time interval when the number of the OBUs responded in the uplink time interval exceeds a preset threshold, where the second downlink time interval is smaller than the first downlink time interval;
the receiving module is further configured to receive VST response signals returned by the plurality of OBUs according to the preset batch within an uplink time interval according to the second BST message, and broadcast a third BST message when the second downlink time interval elapses;
the receiving module is further configured to receive the VST response signal returned by the OBU that has completed responding to the BST message according to the preset batch, and continue to perform the step of broadcasting the next BST message when the second downlink time interval elapses.
6. The apparatus of claim 5,
the broadcasting module is further configured to broadcast a second BST message according to the first downlink time interval when the number of the OBUs responded in the uplink time interval does not exceed a preset threshold.
7. The apparatus of claim 5, wherein the predetermined batch is a time window dividing the uplink time interval into a predetermined number of sub-time windows.
8. The apparatus of claim 5, wherein the determining module is specifically configured to determine the number of OBUs responding in the upstream time interval according to the number of VST response signals returned.
9. An apparatus for identifying an OBU, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of identifying an OBU according to any of claims 1 to 4.
10. A computer-readable storage medium having stored thereon computer-executable instructions which, when executed by a processor, implement the method of identifying an OBU according to any of claims 1 to 4.
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