CN108040327A - Message relay method, car-mounted terminal, automobile and intelligent transport system - Google Patents
Message relay method, car-mounted terminal, automobile and intelligent transport system Download PDFInfo
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- CN108040327A CN108040327A CN201711059025.9A CN201711059025A CN108040327A CN 108040327 A CN108040327 A CN 108040327A CN 201711059025 A CN201711059025 A CN 201711059025A CN 108040327 A CN108040327 A CN 108040327A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
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- Computer Networks & Wireless Communication (AREA)
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- Traffic Control Systems (AREA)
Abstract
The present invention relates to a kind of message relay method based on DSRC, car-mounted terminal, automobile and intelligent transport system based on V2X, in the message relay method based on DSRC, car-mounted terminal follows the steps below：Repeater mode enters step：Vehicle is detected currently whether in dead ship condition, and when detecting in dead ship condition, into repeater mode；Receiving step：BSM broadcast packets are received in the relay mode；Forward step：Forward the BSM broadcast packets.Implement technical scheme, parked cars by trackside and BSM message is relayed, increase the quantity of DSRC nodes, avoid in special scenes due to blocking, apart from the short situation of line-of-sight transmission caused by limitation etc., moreover, the deployment of roadside unit can be reduced, cost has been saved.
Description
Technical field
The present invention relates to intelligent transportation (Intelligent Transportation System, ITS) field, especially relate to
And a kind of the message relay method based on DSRC, car-mounted terminal, automobile and the intelligent transport system based on V2X.
Background technology
V2X (Vehicle to X) includes V2V (Vehicle to Vehicle) and V2I (Vehicle to
Infrastructure), it is the key technology of following intelligent transport system.It causes car and car, Che Yulu, car and pedestrian
Between can direct real-time Communication for Power, be such as all that driver is mounted with a pair of " multi-functional eyes ", " can see " in advance or
" prediction " arrives the various relevant informations (such as real-time road, road information, pedestrian information) with traffic trip, so as to improve driving
Security, reduce urban traffic blocking, lifting traffic trip quality, the vehicle-mounted life that diversification is provided, city be continuously improved
Vehicle supervision department's management performance etc..
But V2X technologies also have its limitation, due to the use of the frequency spectrum based on 5.9GHz, it is very sensitive to blocking, but
Line-of-sight transmission cannot often meet again in urban environment；The problem of transmission range that high-frequency is brought at the same time is relatively short is not allowed yet
Ignore.
The content of the invention
The technical problem to be solved in the present invention is, for the above-mentioned sighting distance that can not meet in urban environment of the prior art
The defects of transmission, there is provided a kind of message relay method based on DSRC, car-mounted terminal, automobile and the intelligent transportation fortune based on V2X
Defeated system, can meet the line-of-sight transmission in urban environment.
The technical solution adopted by the present invention to solve the technical problems is：Construct a kind of message relay side based on DSRC
Method, car-mounted terminal follow the steps below：
Repeater mode enters step：Vehicle is detected currently whether in dead ship condition, and when detecting in dead ship condition, into
Enter repeater mode；
Receiving step：BSM broadcast packets are received in the relay mode；
Forward step：Forward the BSM broadcast packets.
Preferably, the pattern enter step including：
Whether detection vehicle stops working, or, whether detection vehicle does not move in preset period of time；
If not moved in vehicle stall or preset period of time, the warning function of car-mounted terminal is closed, and enters repeater mode.
Preferably, the BSM broadcast packets include header part and data portion, and the header part includes forwarding and marks；
Moreover,
The forwarding step includes：
Whether the forwarding marker for judgment in the BSM broadcast packets is final jump；
If not final jump, then the forwarding mark of the header part is changed, and forward amended BSM broadcast packets.
Preferably, the forwarding is labeled as hop count；Moreover,
Whether the forwarding marker for judgment in the BSM broadcast packets is final jump, including：
Judge whether the hop count in the BSM broadcast packets is 0, if so, being then determined as final jump；It is if it is not, then true
Fixed is not final jump；
The forwarding mark of the header part is changed, including：
The header part in the BSM broadcast packets is inserted after subtracting one by current hop count.
Preferably, further include：
Normal mode enters step：Vehicle is detected currently whether in dead ship condition, and when detecting not in dead ship condition,
Into normal mode.
Preferably, further include：
Repeater mode exit step：The remaining capacity of the storage battery of vehicle is monitored, and is less than preset value in the remaining capacity
When, exit the repeater mode.
The present invention also constructs a kind of car-mounted terminal, including：
Repeater mode enters module, for whether detecting vehicle currently in dead ship condition, and is detecting in dead ship condition
When, into repeater mode；
Receiving module, for receiving BSM broadcast packets in the relay mode；
Forwarding module, for forwarding the BSM broadcast packets.
The present invention also constructs a kind of car-mounted terminal, including processor, and the processor is used to perform what is stored in memory
The step of message relay method as described above based on DSRC is realized during computer program.
The present invention also constructs a kind of automobile, including above-described car-mounted terminal.
The present invention also constructs a kind of intelligent transport system based on V2X, including multiple above-described car-mounted terminals,
Multiple car-mounted terminals are separately positioned on different vehicles, and wireless connected.
Implement technical scheme, parked cars by trackside and BSM message is relayed, increase DSRC nodes
Quantity, avoids due to blocking, apart from the short situation of line-of-sight transmission caused by limitation etc. in special scenes, moreover, can reduce
The deployment of roadside unit, has saved cost.
Brief description of the drawings
In order to illustrate the embodiments of the present invention more clearly, attached drawing makees letter needed in being described below to embodiment
Singly introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for the common skill in this area
For art personnel, without creative efforts, other attached drawings can also be obtained according to these attached drawings.Attached drawing
In：
Fig. 1 is the flow chart of the message relay embodiment of the method one of the invention based on DSRC；
Fig. 2 is the transmission schematic diagram of DSRC messages of the present invention；
Fig. 3 is the schematic diagram that the present invention applies message relay method in scene of inversely overtaking other vehicles；
Fig. 4 is the schematic diagram that the present invention applies message relay method in anti-collision warning scene；
Fig. 5 is the building-block of logic of car-mounted terminal embodiment one of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the flow chart of the message relay embodiment of the method one based on DSRC of the invention, the embodiment based on
In the message relay method of DSRC, car-mounted terminal follows the steps below：
S10. repeater mode enters step：Vehicle is detected currently whether in dead ship condition, and is being detected in dead ship condition
When, into repeater mode；
S20. receiving step：BSM broadcast packets are received in the relay mode；
S30. step is forwarded：Forward the BSM broadcast packets.
In a preferred embodiment, to avoid network storm, forwarding can be set to mark in DSRC messages, so as to set
The maximum hop count of DSRC messages.Specifically, BSM broadcast packets include header part and data portion, and the header part includes turning
Issue of bidding documents is remembered.Moreover, step S30 includes：
S31. whether the forwarding marker for judgment in the BSM broadcast packets is final jump；
If not S32. final jump, then the forwarding mark of the header part is changed, and forward amended BSM to broadcast
Bag.
In a specific embodiment, forwarding is labeled as hop count, moreover, step S31 includes：
Judge whether the hop count in the BSM broadcast packets is 0, if so, being then determined as final jump；It is if it is not, then true
Fixed is not final jump；
Moreover, in step S32, the step of forwarding mark for changing the header part, includes：
The header part in the BSM broadcast packets is inserted after subtracting one by current hop count.
In this embodiment, the initial value of hop count is arranged to maximum hop count, moreover, BSM broadcast packets often forward once,
Hop count just subtracts one, until hop count is just stopped forwarding for 0, so as to effectively prevent broadcast storm.
Certainly, in other embodiments, also the initial value of hop count can be arranged to 0, moreover, every turn of BSM broadcast packets
Once, hop count just adds one to hair, until hop count is just stopped forwarding for maximum hop count, so also can effectively prevent from broadcasting wind
Cruelly.
Further, since packet receiving side can be also broadcasted after BSM broadcast packets are received, so, at this time, the former party awarding the contract can weigh again
The BSM broadcast packets are received again, so will also result in broadcast storm, and to avoid the generation of such case, car-mounted terminal is receiving
After BSM broadcast packets, also follow the steps below：
Judge whether the BSM broadcast packets are to receive first, if receiving first, then further according to forwarding marker for judgment whether
For final jump.Preferably, the cryptographic Hash of the data portion of the BSM broadcast packets is calculated by default hash algorithm, and is sentenced
The cryptographic Hash of breaking whether there is in local cache table, if being not present in local cache table, it is determined that to receive first, and will
The cryptographic Hash is stored in local cache table.
In this embodiment, car-mounted terminal is established and safeguards that one receives message data storehouse, and message is received for caching
Cryptographic Hash, when there is new message to arrive, does it Hash processing, if obtained cryptographic Hash has existed, without forwarding.
Certainly, in other embodiments, also bag mark, example can be inserted in the header part of BSM broadcast packets when generating BSM broadcast packets
Such as it is bag sequence number.After car-mounted terminal receives BSM broadcast packets, the bag mark in header part is extracted, and judge that the bag identifies
Whether in cache table, so as to judge whether the BSM broadcast packets are to receive first.
In a specific embodiment, step S10 is specifically included：
S11. whether detection vehicle stops working, or, whether detection vehicle does not move in preset period of time；
If S12. not moved in vehicle stall or preset period of time, the warning function of car-mounted terminal is closed, and enter relaying
Pattern.
In this embodiment, car-mounted terminal can be accessed vehicle CAN bus, in this way, the controller of car-mounted terminal can pass through
Vehicle CAN bus detects whether vehicle stops working in real time.In addition, car-mounted terminal can also set GPS module, and examined by GPS module
Whether measuring car does not move in preset period of time, it is readily appreciated that, other locating modules such as Big Dipper, complete identical function.
If stopping working or not moving, other scenes and unrelated function are closed, into trunk module, to save electricity.
Further, in one alternate embodiment, further include：
S40. normal mode enters step：Vehicle is detected currently whether in dead ship condition, and is being detected not in parking shape
During state, into normal mode.
In this embodiment, when car-mounted terminal judges vehicle restarting, normal mode is put into, recovery system is complete
The function of operating.
In another alternative embodiment, further include：
S50. repeater mode exit step：The remaining capacity of the storage battery of vehicle is monitored, and is less than in advance in the remaining capacity
If during value, the repeater mode is exited, for example, monitoring the remaining capacity of the storage battery of vehicle by vehicle CAN bus.
It should be noted that, on the car-mounted terminal on vehicle, it has two operating modes herein：Normal mode and
Repeater mode.
When car-mounted terminal judges normal vehicle operation, i.e., vehicle is not currently in dead ship condition, into normal mode.Just
Under norm formula, car-mounted terminal can generate the BSM information of itself, travel speed of the information including vehicle itself, direction, longitude and latitude
The BSM information generated, is then broadcasted by the important information of the security criticals such as degree, height, historical path information.In addition,
In the normal mode, nearby vehicle can also be received or BSM information that roadside unit is sent, when receiving other vehicle or trackside lists
After the BSM information that member is sent, and then various types of early warning analysis are carried out to the BSM information, for example, anti-collision warning, congestion are pre-
Police, early warning of inversely overtaking other vehicles, speed guiding.
When car-mounted terminal judges vehicle in dead ship condition, for example, vehicle parking is in trackside, into repeater mode.In
After under pattern, car-mounted terminal only selects to open relay function, i.e. does not generate and broadcasts the BSM information of itself, simply receiving
After the BSM information sent to other vehicles or roadside unit, it is broadcasted away.With reference to Fig. 2, the application layer of car-mounted terminal
One application of operation is only needed, which consigns to protocol stack and bottom to received any WSMP message original road, and broadcasts out
Go.In this way, even in complicated urban environment, DSRC messages are relayed using in trackside parked vehicle, it is possible to reduce trackside list
The installation of member, so that cost is reduced, meanwhile, it is capable to the shortcomings that overcoming part DSRC to block the limitation with distance.
On repeater mode, it should be noted that, since car-mounted terminal by preceding dress or rear attaching enters automobile storage battery, and car
Average operating current when mounted terminal is launched is about 0.5A, and general-utility car storage battery electricity is 54AH~60AH, therefore electric with automobile
Bottle supports the car-mounted terminal operating long period, will not cause thanks to point.Moreover, when car-mounted terminal passes through vehicle CAN bus monitoring car
Storage battery remaining capacity, and when the remaining capacity is less than preset value, the repeater mode is exited, so as to prevent storage battery
Thanks to point influences the functions such as igniting.
On car-mounted terminal, it should be noted that, meanwhile, the controller of car-mounted terminal is also monitored by vehicle CAN bus
The remaining capacity of vehicle accumulator, when remaining capacity reaches a lower limit, stops the relaying transmitting-receiving of car-mounted terminal.
The application scenarios of trunking mechanism are exemplified below：
With reference to Fig. 3, the BSM message (underlying security message) sent to always car (vehicle of middle lane) is by rightmost side car
The cart in road blocks, and is intended to passing vehicle (trolley in rightmost side track) and perceives at this time less than to carrying out car to having, causes security risk,
And by the relaying of (vehicle in leftmost side track) of parking cars in trackside, passing vehicle is then received opposed vehicle
BSM message, judges in advance.
With reference to Fig. 4, at the position of intersection, the BSM message that two cars at crossing are sent is hidden by trees and house
Gear, still, at this time, relays BSM message by trackside parked vehicle, two cars " seeing " at crossing can be allow right
Side.In addition, avoiding scene also similar with this scene as bend collides, can be relayed using Roadside Parking vehicle.Although
Roadside unit can also install relay application to be forwarded to, but be laid with the of high cost of roadside unit, it is difficult to all places are covered,
So Roadside Parking vehicle is a supplement well.
In addition, in speed guides scene, if relayed by trackside parked vehicle, traffic light intersection is being closed on
Vehicle can be earlier the phase information for getting traffic lights, driver can be helped to make sentencing for acceleration or deceleration early
It is disconnected, improve economy.In congestion avoids scene, relay vehicle can allow the farther of congestion message transmission, be capable of higher
Lift traffic efficiency.
Fig. 5 is the building-block of logic of car-mounted terminal embodiment one of the present invention, and the car-mounted terminal of the embodiment includes relaying mould
Formula enters module 10, receiving module 20 and forwarding module 30, wherein, repeater mode enters module 10 is currently for detecting vehicle
It is no in dead ship condition, and when detecting in dead ship condition, into repeater mode；Receiving module 20 is used to connect in the relay mode
Receive BSM broadcast packets；Forwarding module 30 is used to forward the BSM broadcast packets.
The present invention also constructs a kind of car-mounted terminal, including processor, and the processor is based on performing and being stored in memory
The step of message relay method based on DSRC as more than is realized during calculation machine program.
The present invention also constructs a kind of automobile, including above-described car-mounted terminal.
The present invention also constructs a kind of intelligent transport system based on V2X, including multiple above-described car-mounted terminals,
Multiple car-mounted terminals are separately positioned on different vehicles, and wireless connected.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, any bun made
Change, equivalent substitution, improvement etc., should be included within scope of the presently claimed invention.
Claims (10)
- A kind of 1. message relay method based on DSRC, it is characterised in that car-mounted terminal follows the steps below：Repeater mode enters step：Vehicle is detected currently whether in dead ship condition, and when detecting in dead ship condition, in After pattern；Receiving step：BSM broadcast packets are received in the relay mode；Forward step：Forward the BSM broadcast packets.
- 2. the message relay method according to claim 1 based on DSRC, it is characterised in that the pattern enters step bag Include：Whether detection vehicle stops working, or, whether detection vehicle does not move in preset period of time；If not moved in vehicle stall or preset period of time, the warning function of car-mounted terminal is closed, and enters repeater mode.
- 3. the message relay method according to claim 1 based on DSRC, it is characterised in that the BSM broadcast packets include Header part and data portion, the header part include forwarding and mark；Moreover, the forwarding step includes：Whether the forwarding marker for judgment in the BSM broadcast packets is final jump；If not final jump, then the forwarding mark of the header part is changed, and forward amended BSM broadcast packets.
- 4. the message relay method according to claim 3 based on DSRC, it is characterised in that the forwarding is labeled as forwarding Number；Moreover,Whether the forwarding marker for judgment in the BSM broadcast packets is final jump, including：Judge whether the hop count in the BSM broadcast packets is 0, if so, being then determined as final jump；If not, it is determined that no For final jump；The forwarding mark of the header part is changed, including：The header part in the BSM broadcast packets is inserted after subtracting one by current hop count.
- 5. the message relay method according to claim 1 based on DSRC, it is characterised in that further include：Normal mode enters step：Vehicle is detected currently whether in dead ship condition, and when detecting not in dead ship condition, is entered Normal mode.
- 6. the message relay method according to claim 1 based on DSRC, it is characterised in that further include：Repeater mode exit step：The remaining capacity of the storage battery of vehicle is monitored, and when the remaining capacity is less than preset value, is moved back Go out the repeater mode.
- A kind of 7. car-mounted terminal, it is characterised in that including：Repeater mode enters module, for whether detecting vehicle currently in dead ship condition, and when detecting in dead ship condition, into Enter repeater mode；Receiving module, for receiving BSM broadcast packets in the relay mode；Forwarding module, for forwarding the BSM broadcast packets.
- 8. a kind of car-mounted terminal, it is characterised in that including processor, the processor is used to perform the calculating stored in memory The step of message relay method based on DSRC as described in any one in claim 1-6 is realized during machine program.
- 9. a kind of automobile, it is characterised in that including the car-mounted terminal described in claim 7 or 8.
- 10. a kind of intelligent transport system based on V2X, it is characterised in that including multiple as claimed in claim 7 or 8 Car-mounted terminal, multiple car-mounted terminals are separately positioned on different vehicles, and wireless connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201711059025.9A CN108040327A (en) | 2017-11-01 | 2017-11-01 | Message relay method, car-mounted terminal, automobile and intelligent transport system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711059025.9A CN108040327A (en) | 2017-11-01 | 2017-11-01 | Message relay method, car-mounted terminal, automobile and intelligent transport system |
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| CN108040327A true CN108040327A (en) | 2018-05-15 |
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| CN110798819A (en) * | 2018-08-01 | 2020-02-14 | 华为技术有限公司 | Message propagation method and device |
| CN112492510A (en) * | 2019-08-23 | 2021-03-12 | 和硕联合科技股份有限公司 | Wireless communication system, wireless communication method, and self-propelled device |
| CN113923625A (en) * | 2021-12-14 | 2022-01-11 | 智道网联科技(北京)有限公司 | Information processing method and device based on V2X communication |
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