CN107889077A - A kind of rapid data transmission method based on car networking technology - Google Patents
A kind of rapid data transmission method based on car networking technology Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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Abstract
The invention discloses a kind of rapid data transmission method based on car networking technology, this method carries out initial channel distribution to vehicle node and via node first, via node and vehicle node carry out data transmission in the channel of distribution, switch the data transmission channel of vehicle node in data transmission procedure according to the mobile status of vehicle node.This method carries out the classification of node according to the travel direction of vehicle, distributes different channels.Vehicle node and via node can only communicate in the channel distributed, reduce the interference of data transfer.This method also includes channel and switched, and solves the channel switching problem during the traveling of vehicle node.The transmission direction limitation of via node is defined, by quick method of diffusion and emergency data bag prioritised transmission, the reliability of data has not only been ensured, has also improved the efficiency and speed of data transfer.In addition, this method considers the three-layer network of vehicle node, via node and aggregation node composition.
Description
Technical field
The present invention relates to communication technical field, more particularly to sensor network technology field, in particular to one kind to be based on car
The rapid data transmission method of networking technology.
Background technology
In current life production, highway transportation and traffic activity have already taken up extremely important status, but with
The fast development of traffic, road vehicle quantity are substantially increased, and cause many traffic congestions and traffic accident to occur.In full generation
In the range of boundary, the people for having 500,000 every year dies from traffic accident, and increases year by year.Therefore car networking technology is by increasing people institute
Pay attention to.The development of car networking is very rapid both at home and abroad at present, and DOT proposes first in 2010-2014 strategic plan books
The conception of " car networking ", in order to establish comprehensive, multi-mode a surface transportation system.Japan, Europe follow closely
Thereafter the conception of car networking is proposed.China also proposed car networking construction in 2010, and the same year is listed in national key special subjects
Big event.Car networking technology be realized using radio network technique between vehicle and vehicle or vehicle and road side facility it
Between communication, the function such as Traffic monitoring, path planning, intelligent reminding can be achieved, be now subjected to domestic and foreign scholars and enterprise
Extensive concern.
In car networking VANET (Vehicle Ad Hoc Network), data generally use is wirelessly transferred.But in nothing
In line transmitting procedure, vehicle is also quickly moving.Therefore the requirement of real-time of information transfer is that car networking is badly in need of the pass to be solved
One of key problem, efficient Routing Protocol are essential.Up to the present, some scholars both domestic and external are automobile-used certainly in research
Some achievements are achieved in terms of the method for routing for organizing network, some scholars prevent vehicle node spacing from making greatly very much using multipath
Into interrupted communication link, it is achieved thereby that data are effectively and stable transmission, also scholar's research is except city or highway
Research background outside car networking method for routing, to realize that comprehensive car networking has all dedicated a strength to.Although these methods
The communication of car networking can be realized to a certain extent, but still come with some shortcomings：1) it is main to improve number using Routing Protocol
According to the reliability of transmission, the efficiency of transmission and expansion rate of vehicle data are not improved：2) only under the ecotopia of simulation
Tested, not in view of different roads complexity and data transfer interference.
The content of the invention
The present invention is in order to solve the above technical problems, purpose in this is to provide and a kind of can reduce the dry of data transfer
Disturb, improve the efficiency of data transfer and the rapid data transmission method based on car networking technology of diffusion velocity.
In order to realize the purpose of the present invention, the rapid data transmission method based on car networking technology that is provided is right first
Vehicle node and via node carry out initial channel distribution, and via node and vehicle node carry out data biography in the channel of distribution
It is defeated, switch the data transmission channel of vehicle node in data transmission procedure according to the mobile status of vehicle node.This method is advanced
Row channel distribution, via node and vehicle node carry out data transmission in pre-assigned channel, avoid between channel
Interfere, improve the efficiency and diffusion velocity of data transfer.
Specifically, the initial channel distribution concretely comprises the following steps：
A1：Electronic map information is analyzed, is divided into M region, and with each region of digital number and its region
All roads；
A2：Start to dispose some via nodes on both sides of the road along road in each road one end, and to each via node
Name address；
A3：The initial of the via node of adjacent this road is distributed according to vehicle node travel direction as defined in every road
Channel；
A4：The initial channel of vehicle node is distributed according to the travel direction of vehicle node itself.
Specifically, the initial channel of the via node is allocated as follows：Vehicle node travel direction as defined in road is north,
The initial channel of via node is set as channel 1；Vehicle node travel direction as defined in road is southern, via node initial channel
It is set as channel 2；Vehicle node travel direction as defined in road is east, and via node initial channel is set as channel 3；Road is advised
Fixed vehicle node travel direction is west, and via node initial channel is set as channel 4.
Specifically, the initial channel of the vehicle node is allocated as follows：Vehicle node travel direction is northern, at the beginning of vehicle node
Beginning channel setting is channel 1；Vehicle node travel direction is south, and vehicle node initial channel is set as channel 2；Vehicle node row
Sail direction and be set as channel 3 for east, vehicle node initial channel；Vehicle node travel direction is western, vehicle node initial channel
It is set as channel 4.
Specifically, the relay node address name is in the following way：1st~4 byte is the numbering in region；5th~8
Byte is the numbering of road in region；9th~12 byte is the numbering of via node on present road；13rd byte is compiled for channel
Number.
Specifically, the via node and vehicle node carry out data transmission in the channel of distribution, the data transfer is abided by
Follow following steps：
B1：Initiation parameter：Queue and the routing table of via node and vehicle node are initialized, and according to initial channel point
Channel corresponding to method of completing the square selection；
B2：Broadcast data packet：Via node and vehicle node judge oneself state respectively, and broadcast packet is containing source address, target
Address, package number, packet hop count, the positional information of source node, the relaying of the data transmitted by source node and check bit
Node data bag and vehicle node packet；
B3：Received data packet：It is different with received object according to main body is received, one of following steps are performed respectively：
1st, via node receives regeneration node data bag, then first determines whether is relay node address in the packet
More than own node address；If being more than, its data bag, and the letter in received regeneration node data bag are sent
Breath updates itself routing table, does not otherwise send its data bag；Secondly the urgent of received regeneration node data bag is judged
Situation flag bit, and following steps are performed according to judged result：
1-1：If the emergency flag bit of regeneration node data bag is not 1, step 1-3 is performed, is otherwise urgent number
According to bag, whether the forwarding hop count for the emergency data bag that need to judge to receive is less than 7, if less than 7, performs step 1-2；If it is not less than
7, then perform step B4；
1-2：Analyze whether next forward node in emergency data bag is own node, if so, then by emergency data bag
In data be stored in itself urgent queue, perform step B4；If not then directly perform step B4；
1-3：Judge whether the forwarding hop count of regeneration node data bag is less than 5, if less than 5, the data in packet are deposited
Enter itself regular queue, jump to step B4；Step B4 is leapt to if not less than 5；
2nd, via node receives vehicle node packet, feeds back itself regeneration node data bag；And analyze what is received
The emergency flag bit of vehicle node packet, judges whether vehicle node occurs emergency, if vehicle node packet
Emergency flag bit be 1, then emergency occurs for vehicle node, and vehicle node data are stored in into urgent queue, jump to step
Rapid B5；Otherwise emergency is not present, then vehicle node data is stored in regular queue, jumps to step B5；
3rd, vehicle node receives regeneration node data bag, and judgement is with the via node channel inquired in electronic map
It is no consistent, if unanimously, be verified, the routing table of the vehicle node is updated, according to electronic map and vehicle running state,
The travel situations of vehicle are analyzed, switch the data transmission channel of vehicle node；Otherwise it is right to search road residing for Current vehicle node
Side and closest relay node address；
B4：Judge urgent queue with the presence or absence of etc. emergency data to be sent, if so, then utilizing quick method of diffusion immediately
The emergency data bag is sent, jumps to step B5；Step B5 is leapt to if nothing；
B5：Judge whether urgent queue is the routine datas to be sent such as empty and regular queue presence, if so, then conventional number
The rear via node farthest according to physical location in routing table is transferred to, jumps to step B2；It is on the contrary then leap to step B2.
Specifically, the quick method of diffusion is as follows：
In the routing table, the current hop node via node farthest with physical location in routing table is determined, is selected in this
After node as next forward node, and broadcast transmission packet；If the packet of other via nodes is received, and root
According to information in packet judge itself whether next forward node as the packet, if it is, the number received
Sent according to packet broadcast, otherwise monitor the packet of other via nodes, do not forward the packet.
Specifically, the data transmission channel of the switching vehicle node is according to vehicle node transport condition and vehicle node institute
The road conditions of traveling switch over, and concrete mode is as follows：
If the 1, vehicle does not change travel along present road, according to electronic map and vehicle running state, sentence
One of disconnected present road situation, and followed the steps below according to road conditions：
If 1) present road allows to keep straight on and reversed end for end, vehicle node does not switch channel, still existed when straight trip passes through crossing
Carry out data transmission in present channel；If present road allows to turn left, keeps straight on and reverse end for end, vehicle node passes through crossing in straight trip
When, do not switch channel, still carry out data transmission in the current channel；
If 2) present road allows to turn right, keep straight on and reverse end for end, vehicle node is sequentially switched to when straight trip passes through crossing
Road corresponding to Current vehicle node travel direction via node numbering be 1 via node channel and present road it is reverse
The via node channel of road, respectively sends a packet, and vehicle straight trip switches back into the progress of present road channel after passing through crossing
Data transfer；
If 3) present road allows to turn left, turns right, keeps straight on and reverses end for end, vehicle node is when straight trip passes through crossing, successively
It is switched to the two kinds of channels and present road of the right side via node of two roads corresponding to Current vehicle node travel direction
The via node channel of reverse road, respectively sends a packet, and vehicle straight trip switches back into present road channel after passing through crossing
Carry out data transmission；
If the 2, head end operation changes travel, in head end operation, one is sent to the via node of present road
Packet, the via node channel that vehicle completes to be switched to reverse road after reversing end for end carry out data transmission；
If the 3, vehicle turns left to change travel along present road, according to electronic map and vehicle running state,
One of judge present road situation, and followed the steps below according to road conditions：
If 1) present road allows to turn left and turned right, vehicle is switched to Current vehicle node when left-hand rotation passes through crossing
The channel of the right side via node of two roads corresponding to travel direction sends a packet, after left side road is transferred to, cuts
The channel for changing to the right side via node of road corresponding to Current vehicle node travel direction carries out data transmission；
If 2) present road allows to turn left, keeps straight on and reverses end for end, vehicle is when left-hand rotation passes through crossing, according to vehicle traveling side
To being sequentially switched to corresponding to vehicle heading, via node numbers the via node channel for being 1 and current road on the road of left side
The via node channel of the reverse road on road, a packet is respectively sent, corresponding track is switched to after turning left to pass through crossing
Right side via node channel carries out data transmission；
If 3) present road allows to turn left, turns right, keeps straight on and reverses end for end, vehicle switches successively when left-hand rotation passes through crossing
To the reverse of two kinds of channels of the right side via node of two roads corresponding to Current vehicle node travel direction and present road
The via node channel of road, a packet is respectively sent, the right side that corresponding track is switched to after turning left to pass through crossing relays
The channel of node carries out data transmission；
If the 4, vehicle is turned right along present road and changes travel, according to electronic map and vehicle running state,
One of judge present road situation, and followed the steps below according to road conditions；
1) if present road allows to turn left and turned right or present road allows to turn left, turned right, keeping straight on and reversing end for end, vehicle
When right-hand rotation passes through crossing, the right side via node of two roads corresponding to Current vehicle node travel direction is sequentially switched to
Two kinds of channels, a packet is respectively sent, after completing to be transferred to the right side road of present road, be switched to vehicle node traveling side
Carry out data transmission to the channel of the right side via node in corresponding track；
If 2) present road allows to turn right, keep straight on and reverse end for end, vehicle is switched to present road when right-hand rotation passes through crossing
The channel of right side via node carry out data transmission；
If the 5, vehicle is under other special road conditions, the channel for being switched to the right side via node of present road is carried out
Data transfer.
Specifically, the form of the packet is as follows：
1st~8 bit is source address；9th~16 bit is destination address；17th~24 bit is package number；The
25~28 bits are packet hop count；29th~32 bit is the positional information of source node；33rd~50 bit is source node institute
The data of transmission；51st bit is emergency flag bit, when emergency flag bit is 0, represents that current data packet is normal
Packet is advised, when emergency flag bit is 1, expression current data packet is emergency data bag；52nd~53 bit is verification
Position.
Compared with prior art, beneficial effects of the present invention are mainly manifested in：Node is carried out according to the travel direction of vehicle
Classification, distribute different channels.Vehicle node and via node can only communicate in the channel distributed, reduce data biography
Defeated interference.This method also includes channel and switched, and solves the channel switching problem during the traveling of vehicle node.In defining
Transmission direction after node limits, and by quick method of diffusion and emergency data bag prioritised transmission, not only ensured data can
By property, the efficiency and speed of data transfer are also improved.This method improves the transmission time of information, is applicable to fast-changing
Vehicle running environment.In addition, this method considers the three-layer network of vehicle node, via node and aggregation node composition.
Brief description of the drawings
Fig. 1 is the initial channel allocation process diagram of the present invention；
Fig. 2 is the data transfer flow figure of the present invention；
Fig. 3 is the straight road analysis examples figure of the present invention；
Fig. 4 is the T-shaped road analysis examples figure of the present invention；
Fig. 5 is the crossroad analysis examples figure of the present invention.
Embodiment
It is described in further detail herein with reference to accompanying drawing technical scheme.
Referring to figs. 1 to Fig. 5, the present invention not only allows for vehicle node, via node, it is also contemplated that aggregation node, three kinds
Node has collectively constituted Three Tiered Network Architecture, there is provided a kind of rapid data transmission method based on car networking technology, this method
Initial channel distribution is carried out to vehicle node and via node first, via node and vehicle node are carried out in the channel of distribution
Data transfer, switch the data transmission channel of vehicle node in data transmission procedure according to the mobile status of vehicle node.Wherein
Via node refers to transmission point signal, and in actual application, base station or user do not send a signal to each other directly, but
By via node, the repeated node amplification of signal or regeneration treatment are forwarded.And vehicle node is then people is driven
Automobile, positioner is integrated with thereon, as the travel direction of GPS location instrument, and vehicle node is defined as follows：When vehicle node
The angle of travel direction and direct north is less than or equal to 45 degree, then the travel direction of vehicle node is north；When vehicle node
Travel direction and the angle in due south direction are less than or equal to 45 degree, then the travel direction of vehicle node is south；When vehicle node
Travel direction and the angle in due east direction are less than 45 degree, then the travel direction of vehicle node is east；When the traveling side of vehicle node
It is less than 45 degree to the angle in due west direction, then the travel direction of vehicle node is west.
Described channel distribution can use existing any of which in above method；As shown in figure 1, the application
Method for channel allocation is as follows provided herein：
A1：Electronic map information is analyzed, is divided into M region, and with each region of digital number and its region
All roads；
A2：Start to dispose equidistant or Unequal distance some via nodes on both sides of the road along road in each road one end,
As being spaced 350m between two via nodes；After having disposed via node, the address of each via node is named；The life of via node
Name mode can use existing any of which, and used naming method is the application herein：1st~4 byte is area
The numbering in domain；5th~8 byte is the numbering of road in region；9th~12 byte is the numbering of via node on present road；
13rd byte is channel number；
A3：Adjacent this road is distributed according to vehicle node travel direction as defined in every road or apart from this road
The initial channel of nearest via node；Between vehicle node travel direction as defined in the initial channel and road of via node
Relation can be any, such as：When vehicle node travel direction as defined in road is northern, the initial channel of via node is set as
Channel 1；When vehicle node travel direction as defined in road is southern, via node initial channel is set as channel 2；As defined in road
When vehicle node travel direction is eastern, via node initial channel is set as channel 3；Vehicle node travel direction as defined in road
For it is western when, via node initial channel is set as channel 4.Except of course that except in the case of above-mentioned hypothesis, can also be according to regulation
Vehicle heading arbitrarily distributes the initial channel of via node.
A4：Using satellite positioning module, the travel direction of vehicle node is analyzed, channel is carried out to vehicle node and initially divided
To match somebody with somebody, the initial channel of vehicle node can be distributed arbitrarily, such as：Vehicle node travel direction is northern, vehicle node initial channel
It is set as channel 1；Vehicle node travel direction is south, and vehicle node initial channel is set as channel 2；Vehicle node travel direction
For east, vehicle node initial channel is set as channel 3；Vehicle node travel direction is west, and vehicle node initial channel is set as
Channel 4.
After via node and the initial channel of vehicle node distribute, between via node, via node and vehicle node
Between pass through distributed channel and carry out data transmission, via node most transmit to base station at last by related data, for control centre
Or Surveillance center uses.And between via node, and data transfer between via node and vehicle node have followed necessarily
The step of, as shown in Figure 2；The step of followed, is as follows：
B1：Initiation parameter：Queue and the routing table of via node and vehicle node are initialized, and according to initial channel point
Channel corresponding to method of completing the square selection；
B2：Broadcast data packet：Via node and vehicle node judge oneself state respectively, and broadcast packet is containing source address, target
Address, package number, packet hop count, the positional information of source node, the relaying of the data transmitted by source node and check bit
Node data bag and vehicle node packet；
B3：Received data packet：It is different with received object according to main body is received, one of following steps are performed respectively：
1st, via node receives regeneration node data bag, then first determines whether is relay node address in the packet
More than own node address；If being more than, its data bag, and the letter in received regeneration node data bag are sent
Breath updates itself routing table, does not otherwise send its data bag；Secondly the urgent of received regeneration node data bag is judged
Situation flag bit, and following steps are performed according to judged result：
1-1：If the emergency flag bit of regeneration node data bag is not 1, step 1-3 is performed, is otherwise urgent number
According to bag, whether the forwarding hop count for the emergency data bag that need to judge to receive is less than 7, if less than 7, performs step 1-2；If it is not less than
7, then perform step B4；
1-2：Analyze whether next forward node in emergency data bag is own node, if so, then by emergency data bag
In data be stored in itself urgent queue, perform step B4；If not then directly perform step B4；
1-3：Judge whether the forwarding hop count of regeneration node data bag is less than 5, if less than 5, the data in packet are deposited
Enter itself regular queue, jump to step B4；Step B4 is leapt to if not less than 5；
2nd, via node receives vehicle node packet, feeds back itself regeneration node data bag；And analyze what is received
The emergency flag bit of vehicle node packet, judges whether vehicle node occurs emergency, if vehicle node packet
Emergency flag bit be 1, then emergency occurs for vehicle node, and vehicle node data are stored in into urgent queue, jump to step
Rapid B5；Otherwise emergency is not present, then vehicle node data is stored in regular queue, jumps to step B5；
3rd, vehicle node receives regeneration node data bag, and judgement is with the via node channel inquired in electronic map
It is no consistent, if unanimously, be verified, the routing table of the vehicle node is updated, according to electronic map and vehicle running state,
The travel situations of vehicle are analyzed, switch the data transmission channel of vehicle node；Otherwise it is right to search road residing for Current vehicle node
Side and closest relay node address；
B4：Judge urgent queue with the presence or absence of etc. emergency data to be sent, if so, then utilizing quick method of diffusion immediately
The emergency data bag is sent, jumps to step B5；Step B5 is leapt to if nothing；
B5：Judge whether urgent queue is the routine datas to be sent such as empty and regular queue presence, if so, then conventional number
The rear via node farthest according to physical location in routing table is transferred to, jumps to step B2；It is on the contrary then leap to step B2.
In above-mentioned data transmission step, the regeneration node data bag and vehicle node packet broadcasted include respectively：
1st~8 bit is source address；9th~16 bit is destination address；17th~24 bit is package number；The
25~28 bits are packet hop count；29th~32 bit is the positional information of source node；33rd~50 bit is source node institute
The data of transmission；51st bit is emergency flag bit, when emergency flag bit is 0, represents that current data packet is normal
Packet is advised, when emergency flag bit is 1, expression current data packet is emergency data bag；52nd~53 bit is verification
Position.
And described quick method of diffusion transmission data can then use existing any data transmission method, this
Application is in via node routing table in this used data transfer, determines current hop node and physics in its routing table
The farthest via node in position, the via node is selected as next forward node, and broadcast transmission packet；If receive
To the packet of other via nodes, and according to information in packet judge itself whether next forwarding as the packet
Node, if it is, the data packet broadcast received is sent, the packet of other via nodes is otherwise monitored, does not forward this
Packet.
Due in moving process, travel direction may be changed at any time in vehicle node, can also run into various
Crossing is converged, such as keep straight on crossing, crossroad, T junction.According to electronic map and vehicle running state, the row of vehicle is analyzed
Situation is sailed, performs channel switching method.Reference picture 3, on two way road, via node B1, B2, B3 and vehicle node V3
Communicated with V4 using channel B.Via node A1, A2, A3 and vehicle node V1, V2 are communicated using channel A.Vehicle node V4 is believing
Broadcast data in road B, via node B2 receive data and send packet toward via node B3, and vehicle node V3 receives vehicle
Node V4 and front via node B2 packet；Vehicle node V1 then communicates with vehicle node V2 in channel A, with B channels
It does not interfere with each other.Reference picture 4, on T junction, vehicle V1 travels along road B, is only needed during traveling in channel B
Broadcast data；Vehicle V2 turns left to enter road B by road D, during traveling, turns left during passing through T-shaped crossing,
The upper broadcasting van data of channel B, D；Vehicle V3 is travelled on road D, is only broadcasted on channel D；Vehicle V4 passes through along road C
T-shaped crossing, channel C is broadcasted；Vehicle V5 is turned right by road D enters road C, is broadcasted in channel C, D.Reference picture 5,
On crossroad, vehicle V1 is travelled on road D, only enters row data communication to the vehicle node on channel and via node；Car
V2 is turned left by road D enters road A, turns to and passes through other roads, therefore during steering, number is broadcasted in all channel
According to；Vehicle V3 enters road A, only in the enterprising row data communications of channel A；Vehicle V4 is travelled on road A by crossroad,
Broadcast data in channel C；Vehicle V5 is turned right by road D enters road C, only has an impact to channel C and channel D, so only believing
Broadcast data in road C and channel D.
It is compound channel to be present in each convergence crossing, in order to which ensure also can be by convergence crossing vehicle node and via node
Carry out data transmission according to respective channel, the data that the application also describes switching vehicle node in above-mentioned data transmission procedure pass
Defeated channel, i.e. vehicle node channel switching, as moving traffic node channel be 1, then switch when converging crossing
Into channel 2, or the road that vehicle node will be transferred to is switched to, the channel of nearest via node with the road distance.
Present embodiment there is provided herein a kind of channel switch step, what the channel switch step was travelled based on vehicle node
What the situation for the present road that state and vehicle node are travelled was realized, it is specific as follows：
If the 1, vehicle does not change travel along present road, according to electronic map and vehicle running state, sentence
One of disconnected present road situation, and followed the steps below according to road conditions：
If 1) present road allows to keep straight on and reversed end for end, vehicle node does not switch channel, still existed when straight trip passes through crossing
Carry out data transmission in present channel；If present road allows to turn left, keeps straight on and reverse end for end, vehicle node passes through crossing in straight trip
When, do not switch channel, still carry out data transmission in the current channel；
If 2) present road allows to turn right, keep straight on and reverse end for end, vehicle node is sequentially switched to when straight trip passes through crossing
Road corresponding to Current vehicle node travel direction via node numbering be 1 via node channel and present road it is reverse
The via node channel of road, respectively sends a packet, and vehicle straight trip switches back into the progress of present road channel after passing through crossing
Data transfer；
If 3) present road allows to turn left, turns right, keeps straight on and reverses end for end, vehicle node is when straight trip passes through crossing, successively
It is switched to the two kinds of channels and present road of the right side via node of two roads corresponding to Current vehicle node travel direction
The via node channel of reverse road, respectively sends a packet, and vehicle straight trip switches back into present road channel after passing through crossing
Carry out data transmission；
If the 2, head end operation changes travel, in head end operation, one is sent to the via node of present road
Packet, the via node channel that vehicle completes to be switched to reverse road after reversing end for end carry out data transmission；
If the 3, vehicle turns left to change travel along present road, according to electronic map and vehicle running state,
One of judge present road situation, and followed the steps below according to road conditions：
If 1) present road allows to turn left and turned right, vehicle is switched to Current vehicle node when left-hand rotation passes through crossing
The channel of the right side via node of two roads corresponding to travel direction sends a packet, after left side road is transferred to, cuts
The channel for changing to the right side via node of road corresponding to Current vehicle node travel direction carries out data transmission；
If 2) present road allows to turn left, keeps straight on and reverses end for end, vehicle is when left-hand rotation passes through crossing, according to vehicle traveling side
To being sequentially switched to corresponding to vehicle heading, via node numbers the via node channel for being 1 and current road on the road of left side
The via node channel of the reverse road on road, a packet is respectively sent, corresponding track is switched to after turning left to pass through crossing
Right side via node channel carries out data transmission；
If 3) present road allows to turn left, turns right, keeps straight on and reverses end for end, vehicle switches successively when left-hand rotation passes through crossing
To the reverse of two kinds of channels of the right side via node of two roads corresponding to Current vehicle node travel direction and present road
The via node channel of road, a packet is respectively sent, the right side that corresponding track is switched to after turning left to pass through crossing relays
The channel of node carries out data transmission；
If the 4, vehicle is turned right along present road and changes travel, according to electronic map and vehicle running state,
One of judge present road situation, and followed the steps below according to road conditions；
1) if present road allows to turn left and turned right or present road allows to turn left, turned right, keeping straight on and reversing end for end, vehicle
When right-hand rotation passes through crossing, the right side via node of two roads corresponding to Current vehicle node travel direction is sequentially switched to
Two kinds of channels, a packet is respectively sent, after completing to be transferred to the right side road of present road, be switched to vehicle node traveling side
Carry out data transmission to the channel of the right side via node in corresponding track；
If 2) present road allows to turn right, keep straight on and reverse end for end, vehicle is switched to present road when right-hand rotation passes through crossing
The channel of right side via node carry out data transmission；
If the 5, vehicle is under other special road conditions, the channel for being switched to the right side via node of present road is carried out
Data transfer.
This method considers the three-layer network of vehicle node, via node and aggregation node composition, according to the traveling side of vehicle
To the classification for carrying out node, different channels is distributed.Vehicle node and via node can only communicate in the channel distributed, subtract
The interference of data transfer is lacked.This method also includes channel and switched, and solves the switching of the channel during the traveling of vehicle node and asks
Topic.The transmission direction limitation of via node is defined, by quick method of diffusion and emergency data bag prioritised transmission, is not only ensured
The reliability of data, also improve the efficiency and speed of data transfer.This method improves the transmission time of information, is applicable to
Fast-changing vehicle running environment.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that it can still make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings are considered as illustrative
It is and nonrestrictive.
Claims (9)
- A kind of 1. rapid data transmission method based on car networking technology, it is characterised in that：This method first to vehicle node and Via node carries out initial channel distribution, and via node and vehicle node carry out data transmission in the channel of distribution, and data pass Switch the data transmission channel of vehicle node during defeated according to the mobile status of vehicle node.
- A kind of 2. rapid data transmission method based on car networking technology as claimed in claim 1, it is characterised in that：It is described first Beginning channel distribution concretely comprises the following steps：A1：Electronic map information is analyzed, is divided into M region, and with owning in each region of digital number and its region Road；A2：Start to dispose some via nodes on both sides of the road along road in each road one end, and to the address of each via node Name；A3：The initial letter of the via node of adjacent this road is distributed according to vehicle node travel direction as defined in every road Road；A4：The initial channel of vehicle node is distributed according to the travel direction of vehicle node itself.
- A kind of 3. rapid data transmission method based on car networking technology as claimed in claim 2, it is characterised in that：In described Initial channel after node is allocated as follows：Vehicle node travel direction as defined in road is north, and the initial channel of via node is set It is set to channel 1；Vehicle node travel direction as defined in road is south, and via node initial channel is set as channel 2；Road provides Vehicle node travel direction be east, via node initial channel is set as channel 3；Vehicle node travel direction as defined in road For west, via node initial channel is set as channel 4.
- A kind of 4. rapid data transmission method based on car networking technology as claimed in claim 3, it is characterised in that：The car The initial channel of node is allocated as follows：Vehicle node travel direction is north, and vehicle node initial channel is set as channel 1；Car Node travel direction is south, and vehicle node initial channel is set as channel 2；Vehicle node travel direction is eastern, vehicle node Initial channel is set as channel 3；Vehicle node travel direction is west, and vehicle node initial channel is set as channel 4.
- A kind of 5. rapid data transmission method based on car networking technology as claimed in claim 4, it is characterised in that：In described After node address name in the following way：1st~4 byte is the numbering in region；5th~8 byte is the volume of road in region Number；9th~12 byte is the numbering of via node on present road；13rd byte is channel number.
- 6. a kind of rapid data transmission method based on car networking technology as described in claim 1 or 2 or 3 or 4 or 5, it is special Sign is：The via node and vehicle node carry out data transmission in the channel of distribution, and the data transfer follows following step Suddenly：B1：Initiation parameter：Queue and the routing table of via node and vehicle node are initialized, and according to initial channel distribution side Channel corresponding to method selection；B2：Broadcast data packet：Via node and vehicle node judge oneself state respectively, broadcast packet containing source address, destination address, Package number, packet hop count, the positional information of source node, the via node number of the data transmitted by source node and check bit According to bag and vehicle node packet；B3：Received data packet：It is different with received object according to main body is received, one of following steps are performed respectively：1st, via node receives regeneration node data bag, then first determines whether the relay node address in the packet is more than Own node address；If being more than, its data bag is sent, and the information in received regeneration node data bag is more Itself new routing table, does not otherwise send its data bag；Secondly the emergency of received regeneration node data bag is judged Flag bit, and following steps are performed according to judged result：1-1：If the emergency flag bit of regeneration node data bag is not 1, step 1-3 is performed, is otherwise emergency data bag, Whether the forwarding hop count for the emergency data bag that need to judge to receive is less than 7, if less than 7, performs step 1-2；If not less than 7, Perform step B4；1-2：Analyze whether next forward node in emergency data bag is own node, if so, then by emergency data bag Data are stored in itself urgent queue, perform step B4；If not then directly perform step B4；1-3：Judge whether the forwarding hop count of regeneration node data bag is less than 5, if less than 5, by the data deposit in packet certainly Body regular queue, jump to step B4；Step B4 is leapt to if not less than 5；2nd, via node receives vehicle node packet, feeds back itself regeneration node data bag；And analyze the vehicle received The emergency flag bit of node data bag, judges whether vehicle node occurs emergency, if vehicle node packet is tight Anxious situation flag bit is 1, then emergency occurs for vehicle node, and vehicle node data are stored in into urgent queue, jump to step B5； Otherwise emergency is not present, then vehicle node data is stored in regular queue, jumps to step B5；3rd, vehicle node receives regeneration node data bag, judge with the via node channel that is inquired in electronic map whether one Cause, if unanimously, be verified, update the routing table of the vehicle node, according to electronic map and vehicle running state, analysis The travel situations of vehicle, switch the data transmission channel of vehicle node；Otherwise search residing for Current vehicle node on the right side of road and Closest relay node address；B4：Judge urgent queue with the presence or absence of etc. emergency data to be sent, if so, then immediately using quick method of diffusion send The emergency data bag, jumps to step B5；Step B5 is leapt to if nothing；B5：Judge whether urgent queue is the routine datas to be sent such as empty and regular queue presence, if so, then routine data passes The farthest rear via node of physical location in routing table is defeated by, jumps to step B2；It is on the contrary then leap to step B2.
- A kind of 7. rapid data transmission method based on car networking technology as claimed in claim 6, it is characterised in that：It is described fast Fast method of diffusion is as follows：In the routing table, the current hop node via node farthest with physical location in routing table is determined, selects the relaying section Point is used as next forward node, and broadcast transmission packet；If the packet of other via nodes is received, and according to number According to information in bag judge itself whether next forward node as the packet, if it is, the packet received Broadcast transmission, otherwise monitors the packet of other via nodes, does not forward the packet.
- 8. a kind of rapid data transmission method based on car networking technology as described in claim 1-7 any one, its feature It is：The road that the data transmission channel of the switching vehicle node is travelled according to vehicle node transport condition and vehicle node Situation switches over, and concrete mode is as follows：If the 1, vehicle does not change travel along present road, according to electronic map and vehicle running state, judge to work as One of preceding road conditions, and followed the steps below according to road conditions：If 1) present road allows to keep straight on and reversed end for end, vehicle node does not switch channel, still current when straight trip passes through crossing Carry out data transmission in channel；If present road allows to turn left, keeps straight on and reverse end for end, vehicle node when straight trip passes through crossing, Do not switch channel, still carry out data transmission in the current channel；If 2) present road allows to turn right, keep straight on and reverse end for end, vehicle node is sequentially switched to current when straight trip passes through crossing The via node channel and the reverse road of present road that the via node numbering of road corresponding to vehicle node travel direction is 1 Via node channel, respectively send a packet, vehicle straight trip pass through crossing after switch back into present road channel carry out data Transmission；If 3) present road allows to turn left, turns right, keeps straight on and reverses end for end, vehicle node switches successively when straight trip passes through crossing To the reverse of two kinds of channels of the right side via node of two roads corresponding to Current vehicle node travel direction and present road The via node channel of road, respectively sends a packet, and vehicle straight trip switches back into the progress of present road channel after passing through crossing Data transfer；If the 2, head end operation changes travel, in head end operation, a data are sent to the via node of present road Bag, the via node channel that vehicle completes to be switched to reverse road after reversing end for end carry out data transmission；If the 3, vehicle turns left to change travel along present road, according to electronic map and vehicle running state, judge One of present road situation, and followed the steps below according to road conditions：If 1) present road allows to turn left and turned right, vehicle is switched to Current vehicle node traveling when left-hand rotation passes through crossing The channel of the right side via node of two roads corresponding to direction sends a packet, after left side road is transferred to, is switched to The channel of the right side via node of road carries out data transmission corresponding to Current vehicle node travel direction；If 2) present road allows to turn left, keeps straight on and reverses end for end, vehicle when left-hand rotation passes through crossing, according to vehicle heading according to It is secondary to be switched to the via node channel and present road that via node numbering is 1 on the road of left side corresponding to vehicle heading The via node channel of reverse road, respectively sends a packet, and the right side in corresponding track is switched to after turning left to pass through crossing Via node channel carries out data transmission；If 3) present road allows to turn left, turns right, keeps straight on and reverses end for end, vehicle is sequentially switched to work as when left-hand rotation passes through crossing Two kinds of channels of the right side via node of two roads corresponding to vehicle in front node travel direction and the reverse road of present road Via node channel, respectively send a packet, the right side via node in corresponding track be switched to after turning left to pass through crossing Channel carry out data transmission；If the 4, vehicle is turned right along present road changes travel, according to electronic map and vehicle running state, judge One of present road situation, and followed the steps below according to road conditions；1) if present road allows to turn left and turned right or present road allows to turn left, turned right, keeping straight on and reversing end for end, vehicle is on the right side When turning to pass through crossing, two kinds of the right side via node of two roads corresponding to Current vehicle node travel direction are sequentially switched to Channel, a packet is respectively sent, after completing to be transferred to the right side road of present road, be switched to vehicle node travel direction pair The channel of the right side via node in track is answered to carry out data transmission；If 2) present road allows to turn right, keep straight on and reverse end for end, vehicle is switched to the right side of present road when right-hand rotation passes through crossing The channel of side via node carries out data transmission；If the 5, vehicle is under other special road conditions, the channel for being switched to the right side via node of present road carries out data Transmission.
- 9. a kind of rapid data transmission method based on car networking technology as described in claim 6-8 any one, its feature It is：The form of the packet is as follows：1st~8 bit is source address；9th~16 bit is destination address；17th~24 bit is package number；25th~ 28 bits are packet hop count；29th~32 bit is the positional information of source node；33rd~50 bit is transmitted by source node Data；51st bit is emergency flag bit, and when emergency flag bit is 0, expression current data packet is conventional number According to bag, when emergency flag bit is 1, expression current data packet is emergency data bag；52nd~53 bit is check bit.
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Denomination of invention: A fast data transmission method based on Internet of vehicles technology Effective date of registration: 20220627 Granted publication date: 20200609 Pledgee: Zhuji Branch of Industrial and Commercial Bank of China Ltd. Pledgor: ZHEJIANG RUXIN INTELLIGENT TECHNOLOGY CO.,LTD. Registration number: Y2022980008876 |
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