CN106603658A - IOV (Internet of vehicles) data transmission method and device based on software definition network - Google Patents
IOV (Internet of vehicles) data transmission method and device based on software definition network Download PDFInfo
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- CN106603658A CN106603658A CN201611143296.8A CN201611143296A CN106603658A CN 106603658 A CN106603658 A CN 106603658A CN 201611143296 A CN201611143296 A CN 201611143296A CN 106603658 A CN106603658 A CN 106603658A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/38—Flow based routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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Abstract
The invention provides an IOV (Internet of vehicles) data transmission method and device based on a software definition network, and an IOV comprises an application layer, a control layer, and a data forwarding layer. The control layer carries out the information interaction with the application layer and the data forwarding layer through a northbound interface and a southbound interface. The method comprises the steps that control layer equipment obtains the position information and future track information of all data forwarding layer equipment; the control layer equipment judges whether to transmit a data message through a long-distance cellular wireless communication network or not when the control layer equipment knows that the data forwarding layer equipment needs to send a data message: indicating the data forwarding layer equipment to carry out the forwarding of the data message from a cellular interface if the data message needs to be transmitted through the long-distance cellular wireless communication network, or else, generating a flow table corresponding to the data message according to the position information of the data forwarding layer equipment and the future track information, and transmitting the flow table to the data forwarding layer equipment, so as to enable the data forwarding layer equipment to carry out the forwarding of the data message, and achieve the short-distance wireless communication of the data message.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of car networking data biography based on software defined network
Transmission method and device.
Background technology
In recent years, car networking technology is considered as to improve vehicle driving safety, lift traffic circulation efficiency, reduce traffic energy
Source consumes, reduces one of important technical of traffic pollution, of increasing concern.Additionally, being entered as the Internet by the use of vehicle
Mouthful, provide more information and entertainment service for the user in moving traffic by car networking；Or by the use of vehicle as
Sensing node, is perceived, is gathered, is transmitted to urban environment and vehicle Various types of data itself, is also increasingly becoming and is concerned by people
New opplication demand.
The current widely accepted main flow car networking network architecture can be roughly divided into two big class：Car based on cellular architecture joins
Net and the car networking based on short-distance wireless communication technology (such as Wi-Fi, 802.11p, DSRC etc.), wherein, the latter with vehicle ad-
Hoc network (referred to as VANET) is main representative.
Car networking based on cellular architecture does not exist with the identity of a separate network system：Vehicle is used as cellular network
In a class node, by honeycomb access obtain network accessibility.Cellular network architecture (such as 4G, 5G) of new generation is directed to vehicle
The technical need that the particularity and related application of node is proposed, to the communications such as the air protocol of itself and procotol and parameter
It is adjusted and is adapted to, make cellular network disclosure satisfy that the demand covered to vehicle node, and supports vehicle driving safety, information
The types of applications such as amusement.In cellular networks, when any vehicle need to send packet, must send via cellular uplink
To cellular basestation, likewise, all downlink data packets are sent to vehicle via cellular downlink.
Relatively, based on the car networking of short-distance wireless communication technology be it is a kind of independently of cellular network outside, by vehicle
Node be connected to each other by short-distance wireless communication means and rely on each vehicle itself route self-organizing network.At such
In type network, the long-distance transmissions of packet are often necessary to be completed by way of multi-hop relay, i.e.,：End-to-end path is by several
The temporary link composition that vehicle is formed because meeting, packet must pass through relaying transmission multiple between vehicle could be from source node
Vehicle is transmitted to destination node vehicle.
As can be seen that cellular architecture car networking can be good at supporting the related applications such as vehicle safety real-time to data transfer
The demand of property and reliability.Multi-hop transmission mode in short-distance wireless communication technology car networking framework, then can be in data transfer mistake
Larger delay and drop probabilities are brought in journey.
However, with the arrival in big data epoch, being passed through during the equipment operating data and its traveling of vehicle itself
Zones of different in the related data such as environment, business, be considered with huge application potential and value.It is especially current right
The perception of these data and acquisition means are more and more ripe so as to such mass data transfers and collection demand also increasingly into
For the important consideration that urban network is built.From this angle, had based on the car networking of short-distance wireless communication technology
Have it is free, flexible, free the features such as so as to can occupy a tiny space in mass data collection scene, its reason is：
First, the characteristics of its is free can be the huge flow of each side user saving and rate expense in mass data transfers；Secondly,
The non-time-delayed sensitive data of magnanimity is transmitted using multi-hop transmission technology, can greatly alleviate cellular network pressure, while to travel
Security classes application dramatically saves on the Internet resources such as bandwidth；Finally, the vehicle network based on short-distance wireless communication technology is accessed
Can be completed (such as utilize 802.11p and Wi-Fi) using existing mature technology by vehicle enterprise, produced and transmission data
Can also moderately be maintained secrecy by specific collection mode, and need not make in a large number to there is high commercial value or be related to the guarantor of drive safety
Ciphertext data must pass through publicly-owned carrier network to be transmitted.This feature to vehicle manufacturing enterprise, especially with stronger market
The enterprise of superiority, with stronger captivation, so as to increased the space of short distance access technology application.
In sum, if it is possible to efficiently coordinate and using heterogeneous networks transmission means, example under the same network architecture
Such as on the basis of the real-time application that ensured traffic safety with cellular network, make full use of with short distance peer-to-peer communicationss as handss
The transmission of the insensitive data of network transmission Modal split time delay such as the multi-hop transmission of section, then can effectively share mass data transfers
To the transmission pressure that cellular network brings, with stronger practical value and realistic meaning.
The content of the invention
In view of this, it is an object of the invention to provide a kind of car networking implementation method and dress based on software defined network
Put, can realize under car networking environment multiple network transmission means being managed and can meeting mass data collection answering
Use demand.
In order to achieve the above object, the invention provides following technical scheme：
A kind of car networking data transmission method based on software definition, the car networking includes application layer, key-course sum
According to forwarding；Key-course carries out information exchange by northbound interface, southbound interface and application layer and data forwarding respectively；The party
Method includes：
Key-course equipment obtains the positional information and Future Trajectory information of all data forwarding layer equipment；
When key-course equipment knows that data forwarding layer equipment needs to send datagram, judge whether to need by over long distances
Cellular radio communication network data message transmission, if it is, indicating that data forwarding equipment forwards datagram from cellular interface
Text, otherwise, under generating the corresponding flow table of data message simultaneously according to the positional information and Future Trajectory information of data forwarding layer equipment
Data forwarding layer equipment is sent to, so that data forwarding layer equipment is based on flow table forwarding data packets, the short distance of data message is realized
From radio communication.
A kind of car networking data transmission device based on software definition, the car networking includes application layer, key-course sum
According to forwarding；Key-course carries out information exchange by northbound interface, southbound interface and application layer and data forwarding respectively；The dress
Put and be applied to key-course equipment, including：
Acquiring unit, for obtaining the positional information and Future Trajectory information of all data forwarding layer equipment；
Decision package, during for knowing that data forwarding layer equipment needs to send datagram, judges whether to need by length
Apart from cellular radio communication network data message transmission, if it is, indicating that data forwarding equipment forwards number from cellular interface
According to message, otherwise, the corresponding flow table of data message is generated according to the positional information and Future Trajectory information of data forwarding layer equipment
And data forwarding layer equipment is issued to, so that data forwarding layer equipment is based on flow table forwarding data packets, realize data message
Short-distance wireless communication.
From technical scheme above, in the present invention, in the car networking framework based on software defined network, key-course
Equipment when knowing that data forwarding layer equipment needs to send datagram, the network of decision-making data message transmission, when need pass through
During long range cellular radio communication network data message transmission, indicate that data forwarding equipment forwards datagram from cellular interface
Text, when needing by Small Area Wireless Communication Networks data message transmission, according to the positional information of data forwarding layer equipment and
Future Trajectory information generates the corresponding flow table of data message and is issued to data forwarding layer equipment, so that data forwarding layer sets
It is standby to be based on flow table forwarding data packets, realize the short-distance wireless communication of data message.
Description of the drawings
Fig. 1 is car networking configuration diagram of the embodiment of the present invention based on software defined network；
Fig. 2 is vehicle network data transmission method flow chart of the embodiment of the present invention based on software defined network；
Fig. 3 is structural representation of the embodiment of the present invention based on the car networking data transmission device of software definition.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with the accompanying drawings and according to embodiment,
Technical scheme is described in detail.
In the present invention, software defined network is realized into that thought is applied in car networking, realize being based on software defined network
Car networking framework.Based on the vehicle planar network architecture of software defined network, as shown in figure 1, turning including application layer, key-course, data
Three level of layer are sent out, wherein,
Application layer：
Various types of service applications in car networking, such as traffic flow monitoring, network condition monitoring, aware application field are provided
The acquisition of all kinds of perception datas and key element under scape, user are to management of agreement etc..Compared with other software defines the network architecture, this
In the proposed car networking framework of invention, application layer is characterised by providing the various application models under car networking environment, and
And can be by the normal use of these patterns of the design guarantee of other hierarchical structures.
Key-course：
Key-course is made up of key-course equipment, and the quantity of key-course equipment is according to network size and the concrete tissue for intending adopting
Structures shape, it can also be several that can be one.In car networking framework proposed by the present invention, when there is more than one control
During layer equipment, hierarchical structure can be adopted, that is, there is a master control preparative layer equipment and its next stage key-course equipment is coordinated
And management, the hierarchical structural support two-stage of this classification and more than.Forwarding behavior and plan of the key-course equipment to network data
Slightly carry out centralized control, including but not limited to following control function：Control of network flow quantity, route test, scheduling controlling, plan
Slightly management etc.；Each control module can support the replacement of algorithm, agreement, strategy etc., namely support software definition.Key-course sets
The standby grasp using to global information, is managed to network and controls, and to scheduling of resource, Route Selection etc. decision-making is carried out.
The global information that key-course equipment will appreciate that is included but is not limited to：Positional information (the table of data forwarding layer equipment
The current location of bright data forwarding layer equipment, can be represented with longitude, latitude, be uploaded by data forwarding layer equipment itself or by handing over
Logical administrative organization is obtained by monitoring meanss) and trace information (including past trace information and Future Trajectory information).
Because key-course equipment can be scheduled decision-making using global visual angle, its route and the accuracy dispatched (refer to guarantor
Card packet can be delivered the probability without losing) necessarily significantly larger than even only rely on single node only in accordance with local message
Information carry out the VANET of distributed routing decision.
Data forwarding layer：
Data forwarding layer is made up of data forwarding layer equipment.Data forwarding layer equipment has two kinds：Vehicle node and and network
Related roadside device (Road-Side Unit, RSU, refer to the construction such as Depending on city road, it is with radio communication function,
Can be used for a kind of device of collecting vehicle networking data, be the known noun of car networking Related Research Domain).Wherein, vehicle node
Position do not fix, its Future Trajectory information indicates the track that will be travelled, using including running section, travel direction, OK
Sail the information such as speed to represent；The Future Trajectory information of vehicle node can based on automatic navigator upload etc. means obtain, when with
The information is not then obtained when family does not allow such upload.The position of roadside device is fixed, and its Future Trajectory information is sky.
Because car networking has larger network size, network cluster dividing can be implemented (alternatively referred to as to data forwarding equipment
Subregion etc.) manage, the situation of not sub-clustering can then be considered to be network and only exist a cluster.Network cluster dividing can be according to various sub-clusterings
Logic：Can be divided according to geographic location area, for example, city can be divided into 10 × 10 kilometers of grid, and will
Vehicle in each grid is classified as a cluster, and distributes corresponding key-course equipment and be managed；Can also be according to data forwarding
The functional attributes of layer equipment are divided, and for example, all of No. 9 buses in city can be divided into into cluster or be owned certain company
Taxi be divided into cluster, and distribute corresponding key-course equipment and be managed.The way to manage of network cluster dividing can be reduced often
The administrative burden of individual key-course equipment simultaneously improves its response speed, while also beneficial to the more accurate perception to Internet resources.When not
During with cluster using different key-course equipment controles, it is needed finally by a global key-course equipment control, so as to guarantee section
Handover of vehicle node etc. in the global synchronization of information, and coordination data forwarding equipment.
In the present invention, key-course carries out information exchange by northbound interface and application layer, by southbound interface (SBI) with
Data forwarding layer carries out information exchange, and SBI is responsible for transmitting control and notice message, because there is such message high real-time to want
Ask, can be transmitted by long range cellular radio communication network.Data transfer between data forwarding layer equipment is then adopted
Short-distance wireless communication real-time performance equity, multi-hop transmission.
Description with reference to more than to inventive network framework, lower mask body introduces the interface of most critical in software definition framework
Agreement is southbound interface agreement.
In embodiments of the present invention, OpenFlow agreements will be currently being widely used to be extended using as inventive network
The southbound interface agreement of framework, is referred to as V-OpenFlow by modified version below.
In the embodiment of the present invention, the southbound interface protocol definition port of data forwarding aspect (i.e. wave point), flow table,
Communication channel and communication process, agreement flow process needs 30 kinds of type of messages altogether, for realizing that communication channel is set up, channel is tieed up
Shield, port identity are obtained, exception wraps report, issue flow table, delete the functions such as flow table.Wherein, most message are still adopted
The type of message of OpenFlow protocol definitions, only illustrates below to the type of message of change.
Multipart is replied message：
During netinit, key-course equipment carries out netinit and obtains node letter by initialization control signaling etc.
Breath, wherein, the acquisition of nodal information is completed by the interaction of " Multipart is asked/replied message ".Utilize in OpenFlow agreements
" Multipart is asked/replied message " is obtaining the port information of datum plane node.And V-OpenFlow is then utilized
Experimenter fields extend to it, to port information, the status information etc. that describe data forwarding layer equipment.
Wherein, " Multipart request messages " is not necessary to extension；And " Multipart is replied message " is set by data forwarding layer
Preparation goes out, and it should carry the port information and status information of data forwarding layer equipment, hence with ofp_experimenter_
Structure structures are extended, and the structure is as follows：
struct ofp_experimenter_structure{
uint32_t experimenter；
uint32_t exp_type；
uint8_t experimenter_data[0]；
}；
Wherein, experimenter fields are the ID of message；
The type of exp_type field identification structures, can be identified with a preset characters string；
Experimenter_data [0] is extensible content field, in the present invention, point of addition, OK in the field
The information such as speed, buffer memory capacity are sailed, used as a preferred implementation, its title and structure are capable of achieving as follows：
struct ofp_port_desc_prop_vehicle{
uint16_t type；
uint16_t length；
uint8_t moving_speed；
uint8_t caching_capacity；
unit8_t pad[2]；
struct location；
}；
Wherein, type=OFPPDPT_EXPERIMENTER, represents this structure for extension message；
Length represents the structure length；
Moving_speed represents current vehicle speed；
Caching_capacity represents the node residual caching capacity；
Pad [2] is filler；
Location represents vehicle location, and with longitude and latitude sign, concrete structure is as follows：
struct location{
uint8_t altitude；
uint8_t longitude；
}
Echo request messages：
In OpenFlow agreements, after key-course equipment and data forwarding layer equipment set up control communication channel, can lead to
Cross " Echo is asked/replied message " to maintain the communication channel, meanwhile, using control of the information realization to short-range radio link
System, i.e. the transmission of hello packet is allowed or forbidden by " Echo request messages " transmitting order to lower levels.
When the data message of data forwarding layer equipment transmission in need, " Packet_In message " is sent first to control
Layer equipment, the address information of key-course equipment in message body etc., with reference to network overall condition, according to currently determined road
By rule, the next-hop node (collection) of packet is determined, and its flow table decision-making is issued by " Flow_Mod message ".Data turn
Layer equipment is sent out after flow table is obtained, that is, has known the next-hop node of the data message, and wait the foundation of short-range radio link.
Key-course equipment by node global position information according to currently employed judgment rule, when thinking that node can be in non-incoming road
When Duan Yuqi specifies next-hop to meet, message " Echo message " transmitting order to lower levels is kept to open short distance hello packet by link
Transmission (authorize set up short-range radio link)；Under data forwarding layer equipment can utilize hello packet chosen with it
One hop node sets up short-range radio link, and completes the delivery of packet.
In V-OpenFlow, extension " Echo request messages " is needed to realize under communication channel maintenance and link establishment order
Send out, be below introduced：
Echo request message structures are as follows：
struct ofp_echo{
struct ofp_header；
uint8_t echo_data[0]；
}
Wherein, as a preferred implementation, the title and structure of echo_data [0] is achievable as follows：
struct opportunistic_link_switch{
struct opf_port；
boolean switch；
}
Wherein, opf_port represents the ID of the port for allowing to set up peer meeting link；
Switch represents the transmission of whether Hello message between turn-on data forwarding node layer, is worth on or off.
The car networking framework based on software defined network and southbound interface agreement therein of the application are carried out above
Describe in detail, the data transmission method of the present invention is realized based on the framework, is described in detail with reference to Fig. 2.
Referring to Fig. 2, Fig. 2 is the embodiment of the present invention based on data transmission method flow process in the car networking of software defined network
Figure, the car networking includes application layer, key-course and data forwarding；Key-course respectively by northbound interface, southbound interface with
Application layer and data forwarding carry out information exchange；As shown in Fig. 2 the method is comprised the following steps：
Step 201, key-course equipment obtain the positional information and Future Trajectory information of all data forwarding layer equipment.
Data forwarding layer equipment includes vehicle node and roadside device.
Key-course equipment can obtain when vehicle net is initialized the positional information of all vehicle nodes and roadside device and
Future Trajectory information.Because vehicle node is mobile, position is not fixed, and needs positional information and the future for periodically reporting itself
Trace information is to key-course equipment so that key-course equipment upgrade in time the vehicle node positional information and Future Trajectory letter
Breath, precisely to control global information.
When step 202, key-course equipment know that data forwarding layer equipment needs to send datagram, judge whether to need to lead to
Long-distance cellular radio communication network data message transmission, if it is, indicating that data forwarding equipment turns from cellular interface
Data message is sent out, otherwise, data message is generated according to the positional information and Future Trajectory information of data forwarding layer equipment corresponding
Flow table is simultaneously issued to data forwarding layer equipment, so that data forwarding layer equipment is based on flow table forwarding data packets, realizes datagram
The short-distance wireless communication of text.
Data forwarding layer equipment generates the data message of a data flow or receives the data message of a data flow simultaneously
When needs are forwarded, to key-course equipment RTS (Ready to Send, a be ready for sending) message, key-course equipment are sent
This RTS message is received, it is determined that/know that data forwarding layer equipment needs to send datagram.RTS messages are equivalent to noted earlier
Packet_In message.
In actual applications, data message can not possibly be gone down by unrestricted forwarding, therefore have forwarding jumping figure to limit.In this reality
In applying example, preferentially using Small Area Wireless Communication Networks (i.e. using the network of wireless short-range technology) data message transmission, namely
Data message is carried out by equity, multi-hop transmission between data forwarding layer equipment using wireless short-range technology.If however, data
Message has already been through repeatedly forwarding and still fails to reach target device (target device is roadside device in the present invention, roadside dress
Putting can be back to server by data message with wired or wireless network), now need consideration to abandon using short-distance wireless
Communication network transmission data message, and then select to use long range cellular radio communication network (i.e. cellular network) transmission data report
Text.
For this purpose, in the present invention, pre-setting a max-forwards jumping figure, and a carrying data are set in RTS messages
The field of the transmission jump number (namely the jumping figure/number of times being forwarded) of message.When key-course equipment receives data forwarding layer equipment
On after the RTS messages that send, according to size ratio of the transmission jump number with default max-forwards jumping figure that data message is carried in RTS messages
Relatively result, it may be determined that follow-up forwarding controlling behavior, specifically, if the transmission of the data message carried in RTS messages is jumped
More than default max-forwards jumping figure, then can determine needs by long range cellular radio communication network data message transmission number,
Otherwise, it may be determined that continue through Small Area Wireless Communication Networks data message transmission.
When needing by long range cellular radio communication network data message transmission, key-course equipment notifies data forwarding
Layer equipment sends data message by cellular interface.When needing by Small Area Wireless Communication Networks transmission data
During message, key-course equipment first has to generate data message according to the positional information and Future Trajectory information of data forwarding layer equipment
Corresponding flow table, by flow table issuance to data forwarding layer equipment, so that data forwarding layer equipment forwards data based on flow table
Message.Wherein, the flow table includes one or more next hop informations.
Short-distance wireless communication is applied between closely located equipment, in the present invention, current data forwarding equipment
Short-distance wireless communication is realized by the way that data message is sent to into other neighbouring data forwarding layer equipment, therefore, with current data
Other closely located data forwarding layer equipment of forwarding equipment can be used as the next-hop of data message.However, due to data
The positional information of the vehicle node in forwarding equipment is changed with the change of Future Trajectory, the close number of current distance
According to forwarding equipment, may gradually space out, and original distant data forwarding layer equipment, then being likely to can be gradually
It is close to.Therefore, it is determined that the next-hop of data message, needs positional information and the Future Trajectory letter for taking into account data forwarding layer equipment
Breath, only apart from current data forwarding equipment relatively and following other data forwarding layer equipment in shortening trend just ratio
Relatively it is suitable as the next-hop of data message.
In the present embodiment, data message is generated according to positional information and the Future Trajectory information of data forwarding layer equipment corresponding
The method of flow table be specifically as follows：Determined and the data forwarding layer equipment according to the positional information of the data forwarding layer equipment
First data forwarding layer cluster tool of the distance in the range of predeterminable range；Future Trajectory based on the data forwarding layer equipment is believed
The distance between breath determination and the data forwarding layer equipment are in the second data forwarding layer cluster tool for shortening trend；Calculate the
The common factor of one data forwarding layer cluster tool and the second data forwarding layer cluster tool, by all data in intersection operation result
Forwarding facility information is used as the corresponding flow table of next hop information write data message.
It should be noted that a kind of concrete grammar of flow table is simply generated above, actually can also be using other realizations
Method, if ensure that the next-hop in flow table is nearer apart from current data forwarding equipment, and with current data forwarding
The distance of equipment is in shortening trend.
In the present invention, the data forwarding between data forwarding layer equipment relies on short-distance wireless communication technology, in communication
Before, the wireless link first set up between data forwarding layer equipment is needed, and wireless link is built between data forwarding layer equipment
Vertical process has dramatically different with the process of setting up of wireless link in any other framework：
It is wireless between other network architecture lower nodes (being in the present invention data forwarding layer equipment) in car networking environment
The foundation of link is divided into two big class：Pure definitiveness and pure opportunistic；Wherein,
Purely definitiveness refers to that key-course equipment, by the grasp in global information to node location, is obtained by GPS information
Know that two node locations are in then to be authorized when communicating with one another in radius and communication link is set up both it, now two nodes just can be sent out
Play link establishment process or direct broadcast transmission packet；
Purely opportunistic referred in the case of without global information, continuous broadcast hello packet between vehicle, and with can
The node for receiving hello packet and feeding back sets up link.
More than the defect of the two clearly：The former is centerized fusion, needs key-course equipment extremely frequently to GPS
Acquisition and global calculation Deng real time information, while such behavior needs a large amount of expenses, there is also problems with：1) can not
Large scale network can be used for；2) loss of some frames or time delay can cause the loss of efficiency of transmission, and LOF and time delay
Situation is very common.Comparatively, the drawbacks of although complete distributed AC servo system of the latter eliminates centerized fusion, but so
Process of setting up need the HELLO message broadcastings of magnanimity, easily cause the wasting of resources, in the region that communication opportunity is nervous, for example
Crossroad or other vehicle close quarterses, can cause the unreasonable of resource to make because of collision, channel contention of hello packet etc.
With.
The wireless link method combined using definitiveness and opportunistic in the present invention, firstly, it is necessary to key-course sets
The standby positional information for grasping data forwarding layer equipment, it is desirable to the periodically (a cycle of the vehicle node in data forwarding layer equipment
Time span be T) report the value of the positional information of itself, T to be determined according to network size etc., can be substantially larger than purely true
What is required in qualitative method reports interval；Secondly, data forwarding layer equipment does not persistently broadcast hello packet, but is receiving control
Can just start to send hello packet during the mandate of preparative layer equipment, and only wirelessly be connected with the next-hop node foundation in flow table.
Specifically the connection licensing process of key-course equipment is：Key-course equipment is first had to according to data forwarding layer equipment
Positional information and Future Trajectory information are generated after the corresponding flow table of data message, judge that the data forwarding layer equipment is every with flow table
Whether connection authorising conditional (using Echo request message realize authorize) is met between individual next-hop, if meeting connection authorizes bar
Part, then authorize the data forwarding layer equipment to set up and the connection between the next-hop, so as to the data forwarding layer equipment is received
After the mandate of key-course equipment, start to perform and set up and the peration data forwarding equipment being connected between the next-hop.
Wherein,
Key-course equipment is generated after the corresponding flow table of data message, judges that data forwarding layer equipment is each next with flow table
Whether meet between jump connection authorising conditional method be：If the next-hop is roadside device, it is determined that the data forwarding layer
Equipment meets with the roadside device and is connected authorising conditional；If the data forwarding floor equipment and the next-hop are located at same traveling road
Section, and the travel direction of the data forwarding layer equipment is to go in the same direction, it is determined that the data forwarding layer equipment and the next-hop it
Between meet connection authorising conditional；Otherwise, it determines connection authorising conditional is not met between the data forwarding layer equipment and the next-hop,
Wherein, same running section is referred to and only there is the section that two crossings are sailed out of for vehicle.
Data forwarding layer equipment receives key-course equipment to the connection between data forwarding equipment and a certain next-hop
After mandate, start to perform the attended operation set up and between a certain next-hop, concrete grammar is：Hello packet is outwards broadcasted, and
After the response message that the next-hop is returned is received, set up and the connection between the next-hop.And setting up and the next-hop
Connection after, stop outwards broadcast hello packet, until receiving the connection between data forwarding layer equipment and other next-hops
Authorize.
In the present embodiment, key-course equipment generates the corresponding flow table of data message, and by flow table issuance to data forwarding layer
After equipment, data forwarding layer equipment can just be based on flow table forwarding data packets, because roadside device is the mesh of data message
Marking device, therefore, if there is roadside device in next-hop, preferentially message is sent to roadside device, therefore, it is specific to turn
Forwarding method is：It is determined that all next-hops being connected are set up with the data forwarding layer equipment, if wherein there is a next-hop
For roadside device, then by setting up with the connection forwarding data packets of the next-hop to the next-hop, otherwise, one is therefrom selected
Next-hop, and by setting up with the connection forwarding data packets of the next-hop to the next-hop.
In the present embodiment, because roadside device is the target device of data message, therefore, once roadside device receives number
According to message, then need not continue to transmit the data message in a network, for this purpose, arrange in RTS messages carrying data message letter
The field of breath, data message information therein being capable of characterize data message.Data forwarding layer equipment receives other data forwardings
During the data message that layer equipment is sent, if the data forwarding layer equipment is roadside device, the data message of reception is reported
To key-course equipment, at this moment, key-course equipment can arrange the rule for abandoning the data message, and be somebody's turn to do receiving to carry again
During the RTS messages of data message information, notified to send the data forwarding layer of the RTS messages according to the rule for abandoning the data message
Equipment abandons the data message, so that the data message will not in a network continue transmission.
Present invention also offers a kind of car networking data transmission device based on software definition, is carried out in detail below in conjunction with Fig. 3
Describe in detail bright.
Referring to Fig. 3, Fig. 3 is structural representation of the embodiment of the present invention based on the car networking data transmission device of software definition
Figure, the car networking includes application layer, key-course and data forwarding；Key-course respectively by northbound interface, southbound interface with
Application layer and data forwarding carry out information exchange；The device is applied to key-course equipment, including：
Acquiring unit 301, for obtaining the positional information and Future Trajectory information of all data forwarding layer equipment；
Decision package 302, during for knowing that data forwarding layer equipment needs to send datagram, judges whether that needs pass through
Long range cellular radio communication network data message transmission, if it is, indicating that data forwarding equipment is forwarded from cellular interface
Data message, otherwise, according to the positional information and Future Trajectory information of data forwarding layer equipment the corresponding stream of data message is generated
Table is simultaneously issued to data forwarding layer equipment, so that data forwarding layer equipment is based on flow table forwarding data packets, realizes data message
Short-distance wireless communication.
In Fig. 3 shown devices,
Data forwarding layer equipment includes vehicle node and roadside device；
The acquiring unit 301, for obtaining the position of all vehicle nodes and roadside device when car networking is initialized
Information and Future Trajectory information, and the positional information that periodically reported according to each vehicle node and Future Trajectory information are to the vehicle section
The positional information and Future Trajectory information of point is updated.
In Fig. 3 shown devices,
The decision package 302, receive send on data forwarding layer equipment when being ready for sending RTS messages, know data
Forwarding equipment needs to send datagram；
The decision package 302, after receiving the RTS messages sent on data forwarding layer equipment, judges to be carried in RTS messages
The transmission jump number of data message whether more than default max-forwards jumping figure, if it is, determine need by long range honeycomb without
Line communication network transmission data message, otherwise, it determines obstructed long-distance cellular radio communication network data message transmission.
In Fig. 3 shown devices,
The Future Trajectory information of vehicle node includes：The running section of vehicle node, travel direction, travel speed；Roadside
The Future Trajectory information of device is sky；
The flow table includes next hop information；
The decision package 302, according to the positional information and Future Trajectory information of data forwarding layer equipment datagram is generated
The method of the corresponding flow table of text is：According to the positional information of the data forwarding layer equipment determine with the data forwarding layer equipment away from
From the first data forwarding layer cluster tool in the range of predeterminable range；Future Trajectory information based on the data forwarding layer equipment
It is determined that with the distance between the data forwarding layer equipment in the second data forwarding layer cluster tool for shortening trend；Calculate first
Data forwarding layer cluster tool and the common factor of the second data forwarding layer cluster tool, all data in intersection operation result are turned
Layer facility information is sent out as the corresponding flow table of next hop information write data message.
In Fig. 3 shown devices,
The decision package 302, after generating the corresponding flow table of data forwarding layer device data message, is further used for：Sentence
Whether meet connection authorising conditional between each next-hop in the data forwarding layer equipment and the flow table of breaking, if meet connection authorized
Condition, then authorize the data forwarding layer equipment to set up and the connection between the next-hop, so that the data forwarding layer equipment is performed
Set up and the operation being connected between the next-hop.
In Fig. 3 shown devices,
The decision package 302, judges whether meet company between each next-hop in the data forwarding layer equipment and flow table
When connecing authorising conditional, it is used for：If the next-hop is roadside device, it is determined that the data forwarding layer equipment and the roadside device symbol
Close connection authorising conditional；If the data forwarding layer equipment and the next-hop are located at same running section, and the data forwarding layer
The travel direction of equipment is to go in the same direction, it is determined that meets connection between the data forwarding layer equipment and the next-hop and authorizes bar
Part；Otherwise, it determines connection authorising conditional is not met between the data forwarding layer equipment and the next-hop, wherein, same traveling road
Section is referred to and only there is the section that two crossings are sailed out of for vehicle.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements done etc. should be included within the scope of protection of the invention.
Claims (14)
1. a kind of car networking data transmission method based on software definition, it is characterised in that the car networking includes application layer, control
Preparative layer and data forwarding；Key-course enters row information by northbound interface, southbound interface and application layer and data forwarding respectively
Interaction；The method includes：
Key-course equipment obtains the positional information and Future Trajectory information of all data forwarding layer equipment；
When key-course equipment knows that data forwarding layer equipment needs to send datagram, judge whether to need by long range honeycomb
Cordless communication network data message transmission, if it is, data forwarding equipment is indicated from cellular interface forwarding data packets, it is no
Then, the corresponding flow table of data message is generated according to the positional information and Future Trajectory information of data forwarding layer equipment and is issued to number
According to forwarding equipment, so that data forwarding layer equipment is based on flow table forwarding data packets, the short-distance wireless of data message is realized
Communication.
2. method according to claim 1, it is characterised in that
Data forwarding layer equipment includes vehicle node and roadside device；
Key-course equipment obtains the positional information and Future Trajectory of all vehicle nodes and roadside device when vehicle net is initialized
Information, and the positional information that periodically reported according to each vehicle node and Future Trajectory information to the positional information of the vehicle node and
Future Trajectory information is updated.
3. method according to claim 2, it is characterised in that
Key-course equipment receive send on data forwarding layer equipment when being ready for sending RTS messages, know data forwarding layer equipment
Needs send datagram；
Key-course equipment is received after the RTS messages sent on data forwarding layer equipment, judges to carry data message in RTS messages
Whether transmission jump number is needed by long range cellular radio communication network more than default max-forwards jumping figure if it is, determining
Data message transmission, otherwise, it determines obstructed long-distance cellular radio communication network data message transmission.
4. method according to claim 3, it is characterised in that
The Future Trajectory information of vehicle node includes：The running section of vehicle node, travel direction, travel speed；Roadside device
Future Trajectory information for sky；
The flow table includes next hop information；
It is according to the method that the positional information and Future Trajectory information of data forwarding layer equipment generate the corresponding flow table of data message：
Determined with the distance of the data forwarding layer equipment in the range of predeterminable range according to the positional information of the data forwarding layer equipment
First data forwarding layer cluster tool；Future Trajectory information determination based on the data forwarding layer equipment sets with the data forwarding layer
The distance between standby the second data forwarding layer cluster tool in shortening trend；Calculate by the first data forwarding layer cluster tool with
The common factor of the second data forwarding layer cluster tool, using all data forwarding layer facility informations in intersection operation result as next
The corresponding flow table of hop-information write data message.
5. method according to claim 3, it is characterised in that
Key-course equipment is generated after the corresponding flow table of data forwarding layer device data message, is further included：Judge that the data turn
Send out in layer equipment and flow table and whether meet connection authorising conditional between each next-hop, if meeting connection authorising conditional, award
Weigh the data forwarding layer equipment to set up and the connection between the next-hop, so that the data forwarding layer equipment is performed under foundation and this
The operation of the connection between one jump；
Data forwarding layer equipment is based on the method for flow table forwarding data packets：It is determined that setting up with the data forwarding layer equipment
All next-hops of connection, if wherein there is a next-hop is roadside device, by the connection with the next-hop set up
Forwarding data packets otherwise, therefrom select a next-hop to the next-hop, and are forwarded with the connection of the next-hop by setting up
Data message is to the next-hop.
6. method according to claim 5, it is characterised in that
Judge that the method for whether meeting connection authorising conditional in the data forwarding layer equipment and flow table between each next-hop is：Such as
Really the next-hop is roadside device, it is determined that the data forwarding layer equipment meets with the roadside device and is connected authorising conditional；If
The data forwarding layer equipment and the next-hop are located at same running section, and the travel direction of the data forwarding layer equipment is opposite
And go, it is determined that meet connection authorising conditional between the data forwarding layer equipment and the next-hop；Otherwise, it determines the data forwarding
Connection authorising conditional is not met between layer equipment and the next-hop, wherein, same running section is referred to and only there are two crossings
For the section that vehicle is sailed out of.
7. method according to claim 5, it is characterised in that
The data forwarding layer equipment performs to set up：The data forwarding layer equipment is outside
Broadcast hello packet, and after the response message that the next-hop is returned is received, set up and the connection between the next-hop.
8. method according to claim 2, it is characterised in that
When data forwarding layer equipment receives the data message that other data forwarding layer equipment are sent, if the data forwarding layer sets
Standby is roadside device, then the data message of reception is reported to into key-course equipment, so that key-course equipment is arranged abandons the data
The rule of message, and when the RTS messages for carrying the data message information are received again, according to the rule for abandoning the data message
Then notify that the data forwarding layer equipment for sending the RTS messages abandons the data message.
9. a kind of car networking data transmission device based on software definition, it is characterised in that the car networking includes application layer, control
Preparative layer and data forwarding；Key-course enters row information by northbound interface, southbound interface and application layer and data forwarding respectively
Interaction；The device is applied to key-course equipment, including：
Acquiring unit, for obtaining the positional information and Future Trajectory information of all data forwarding layer equipment；
Decision package, during for knowing that data forwarding layer equipment needs to send datagram, judges whether to need by over long distances
Cellular radio communication network data message transmission, if it is, indicating that data forwarding equipment forwards datagram from cellular interface
Text, otherwise, under generating the corresponding flow table of data message simultaneously according to the positional information and Future Trajectory information of data forwarding layer equipment
Data forwarding layer equipment is sent to, so that data forwarding layer equipment is based on flow table forwarding data packets, the short distance of data message is realized
From radio communication.
10. device according to claim 9, it is characterised in that
Data forwarding layer equipment includes vehicle node and roadside device；
The acquiring unit, for obtaining the positional information and not of all vehicle nodes and roadside device when car networking is initialized
Come trace information, and position of the positional information and Future Trajectory information periodically reported according to each vehicle node to the vehicle node
Information and Future Trajectory information are updated.
11. devices according to claim 10, it is characterised in that
The decision package, receive send on data forwarding layer equipment when being ready for sending RTS messages, know that data forwarding layer sets
It is standby to need to send datagram；
The decision package, after receiving the RTS messages sent on data forwarding layer equipment, judges to carry datagram in RTS messages
Whether the transmission jump number of text is needed by long range cellular radio Communication more than default max-forwards jumping figure if it is, determining
Transmitted data on network message, otherwise, it determines obstructed long-distance cellular radio communication network data message transmission.
12. devices according to claim 11, it is characterised in that
The Future Trajectory information of vehicle node includes：The running section of vehicle node, travel direction, travel speed；Roadside device
Future Trajectory information for sky；
The flow table includes next hop information；
The decision package, generates data message corresponding according to the positional information and Future Trajectory information of data forwarding layer equipment
The method of flow table is：Determined according to the positional information of the data forwarding layer equipment and preset with the distance of the data forwarding layer equipment
The first data forwarding layer cluster tool in distance range；Future Trajectory information based on the data forwarding layer equipment determines and is somebody's turn to do
The distance between data forwarding layer equipment is in the second data forwarding layer cluster tool for shortening trend；Calculate the first data forwarding
The common factor of layer cluster tool and the second data forwarding layer cluster tool, by all data forwarding layer equipment in intersection operation result
Information is used as the corresponding flow table of next hop information write data message.
13. devices according to claim 11, it is characterised in that
The decision package, after generating the corresponding flow table of data forwarding layer device data message, is further used for：Judge the data
Whether connection authorising conditional is met in forwarding equipment and flow table between each next-hop, if meeting connection authorising conditional,
The data forwarding layer equipment is authorized to set up and the connection between the next-hop, so as to the data forwarding layer equipment is performed and be set up and is somebody's turn to do
The operation of the connection between next-hop.
14. devices according to claim 13, it is characterised in that
The decision package, judges that whether meeting connection in the data forwarding layer equipment and flow table between each next-hop authorizes bar
During part, it is used for：If the next-hop is roadside device, it is determined that the data forwarding layer equipment meets to be connected with the roadside device to be awarded
Power condition；If the data forwarding layer equipment and the next-hop are located at same running section, and the row of the data forwarding layer equipment
Direction is sailed to go in the same direction, it is determined that meet connection authorising conditional between the data forwarding layer equipment and the next-hop；Otherwise, really
It is fixed not meet connection authorising conditional between the data forwarding layer equipment and the next-hop, wherein, same running section referred to and only exist
There is the section that two crossings are sailed out of for vehicle.
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Effective date of registration: 20211223 Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee after: CHINA ACADEMY OF INFORMATION AND COMMUNICATIONS Address before: 100191 No. 52 Garden North Road, Beijing, Haidian District Patentee before: CHINA ACADEME OF TELECOMMUNICATION RESEARCH OF MIIT |