CN106936909A - A kind of method of Traffic information demonstration based on numerical nomenclature network with retrieving - Google Patents
A kind of method of Traffic information demonstration based on numerical nomenclature network with retrieving Download PDFInfo
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- CN106936909A CN106936909A CN201710144345.8A CN201710144345A CN106936909A CN 106936909 A CN106936909 A CN 106936909A CN 201710144345 A CN201710144345 A CN 201710144345A CN 106936909 A CN106936909 A CN 106936909A
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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
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/63—Routing a service request depending on the request content or context
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/90—Details of database functions independent of the retrieved data types
- G06F16/95—Retrieval from the web
- G06F16/953—Querying, e.g. by the use of web search engines
- G06F16/9537—Spatial or temporal dependent retrieval, e.g. spatiotemporal queries
-
- 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
-
- 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
- H04L67/50—Network services
- H04L67/52—Network services specially adapted for the location of the user terminal
Abstract
The invention discloses a kind of Traffic information demonstration based on numerical nomenclature network and the method for retrieval, comprise the following steps that：Suggestion numerical nomenclature mechanism：Name is divided into five Primary layers；The method of Traffic information demonstration：After the packet that source vehicle node will be produced is to around forwarding, the vehicle node for receiving continues outwards broadcast forwarding after caching this packet；Transport information search mechanism：Requestor's vehicle node is sent out interest bag, according to the name prefix matched rule returned data bag of NDN.The present invention does not use the Traffic information demonstration based on NDN mechanism and search method of central server in VANET networks, whole network vehicle is from group, each vehicle node is served as the producer, consumer and turns originator various rolls, vehicle can enter forwarding and the caching of row information by NDN mechanism, and allow that vehicle drivers rapidly and efficiently inquire about the traffic relevant information in a certain geographical position by other vehicles, and the central server without being used under traditional mode.
Description
Technical field
The present invention relates to Traffic information demonstration technical field, specifically a kind of transport information hair based on numerical nomenclature network
Method of the cloth with retrieving.
Background technology
With developing rapidly for Modern Traffic and auto industry, the automobile volume of holding of China is sharply increased, the traffic for taking place frequently
Accident, increasingly serious traffic jam, and the strong Internet access demands of user advance intelligent transportation system jointly
The development of ITS (Intelligent Transportation System).Such as improve road safety, lifting to provide
The application of the aspects such as traffic efficiency, meets demand of the driver to transport information, and Traffic information demonstration arises at the historic moment with retrieval.
Under current TCP/IP network architectures, vehicle needs to equip sensor and communication equipment, and this just forms one
Communication network, i.e. vehicular ad hoc network VANET (Vehicular Ad-hoc Network).In VANET, vehicle and RSU (Road
Side Unit), base station, gps satellite or other vehicles exchange information, these information are used for completing such as preventing vehicle collision, excellent
Change the applications such as vehicle running path, the amusement that road information and user are provided for human pilot.But, in current network system
Under structure, Traffic information demonstration is needed by means of central server with retrieval application, and all vehicles are by the position of oneself, speed etc.
Information uploads onto the server, and other vehicles need to be communicated with server by IP address when obtaining transport information.Service
Device configures high-capacity database, constantly stores the Real-time Traffic Information that each vehicle is sent, during if emergency, can basis
Spot is to surrounding vehicles user's active push message；When vehicle user needs to know the transport information of a certain position, lead to
Cross IP network foundation to connect end to end, sent to server and asked, server process user's request leads to related data information
IP address after the request user known just now sends.For briefly, such pattern is a central server
Transport information is sent to each vehicle send request retrieval transport information to server with each vehicle.
IP network sets up link based on terminal location to provide information exchange function, and the mobility of VANET makes it cannot
Good running in an ip network, there are problems that poor mobility, very flexible,.For example, when a vehicle is to clothes
Business device send acquisition request data when, IP address is 10.1.1.158, and when it is quick move when IP address may become in order to
10.1.1.159, then connection before just it is already off, before this vehicle ask data just obtain less than, it is desirable to obtain number
It is connected according to being accomplished by being set up with server again by new IP address.In addition, if more vehicle user simultaneously request data,
Server stress can be caused excessive or even paralysed, obtain data delay time more long.
Generally speaking, there is problems with the VANET networks under current TCP/IP network architectures：
(1) the distribution subscription system efficiency of information is very low.Because present Internet is main frame-host mode, appoint
The acquisition of what information all has to navigate to the physical host of certain determination；
(2) mobile problem.IP has dual semanteme in Internet, both represents main frame, represents residing for network again
Physical location, if node motion distance range is larger, may change IP address, therefore be unfavorable for vehicle node shifting in network
It is dynamic；
(3) central server is needed to use.All vehicles upload onto the server the information such as the position of oneself, speed, its
Its vehicle needs to carry out telecommunication request data by server ip address when obtaining transport information.
But name data network (Named Data Networking, hereinafter referred to as NDN) can well solve VANET and exist
Problem under IP network.NDN is existed by National Science Foundation (National Science Foundation, NSF)
One of Future network architectures research approach initiated for 2010, purport is the brand-new network architecture of exploitation, emerging to meet
Communication need, and replace existing ICP/IP protocol.It does not consider content storage where physical location, directly set up name number
According to the network system.
The kernel object of NDN be data in itself, rather than the main frame in network, this is numerical nomenclature network with IP network most
Big difference, is also the characteristics of its is maximum and advantage.Because NDN is centered on data content, in being with terminal location
The heart, can be natural solve the problems, such as VANET in an ip network：
(1) the shared of transport information need not use central server.Whole network Complete autonomy, center is gone to without vehicle
Server request data, slow down the possibility of data delay, improve the efficiency of information retrieval.
(2) information cache.Each vehicle node plays the role of the producer, consumer and data forwarding person, especially
It can also carry data when vehicle is not in network as data mule.
(3) structure is named.Because NDN networks are different from existing IP network, maximum difference is that NDN is with content
Center construction, therefore the suitable name structure of design one is one of the key issue for completing the algorithm.
The content of the invention
It is an object of the invention to provide a kind of Traffic information demonstration based on numerical nomenclature network easy to use and inspection
The method of rope, to solve the problems, such as to be proposed in above-mentioned background technology.
To achieve the above object, the present invention provides following technical scheme：
A kind of Traffic information demonstration based on numerical nomenclature network and the method for retrieval, comprise the following steps that：
(1) numerical nomenclature mechanism is advised：Name is divided into five Primary layers, five described Primary layers are respectively city
Area's name, road section, information category, time period, ID；
(2) method of Traffic information demonstration：After the packet that source vehicle node will be produced is to around forwarding, the car for receiving
Continue outwards broadcast forwarding after nodal cache this packet；
(3) transport information search mechanism：When driver will inquire about the transport information in a certain geographical position, to surrounding neighbours car
Node sends interest bag request data, and other vehicles first go in inquiry local cache whether there is the number for meeting after receiving interest bag
According to if then returning, in the interface of content name and reception interest bag recorded into PIT list items without if, so that number
According to energy backtracking, then proceed to forward interest bag to neighbours' vehicle node；When there is packet to return, this is first buffered in
Ground, then the interface number in PIT list items is sent to previous requestor, then this PIT list item is deleted.
As further scheme of the invention：The ID be when VANET networks are built, will be under the network
Vehicle user under VANET security authentication centers real name register account number.
As further scheme of the invention：Added on packet in the step (2) geographical when active data is produced
Location field, upper node geo-location field and attribute field.
As further scheme of the invention：The forwarding mechanism that packet forwarding is carried out in the step (2) is as follows：When
During data flow forwarding, first determine whether the data for receiving whether be the life of main movable property data, if not then according to PIT tables
Record is forwarded and cached, and otherwise further determines whether to be data that Current vehicle is produced, when being Current vehicle node
Will be first data buffer storage in local cache during the data of generation, then outwards broadcast forwarding；When be not Current vehicle produce
Data when, then it is assumed that be that passively have received the data, now will check whether it has respective items in PIT tables, if it has,
Then first it is buffered in locally, then all forwards packet according to the sets of interfaces recorded in PIT list items；If do not had in PIT tables
Occurrence, then first cached, and geographic location field when source data is produced then is taken out from packet, calculates present node and source number
Disa is denoted as according to the distance value in geographical position when producing, the value of upper node geo-location field is further taken out if less than 6km, counted
Calculate current location and be denoted as disb with the distance of upper node geo-location field, work as disa<6km and disb>Just will during 100m
The broadcast of this data is forwarded, and otherwise treatment terminates.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention does not use Traffic information demonstration based on NDN mechanism and the retrieval of central server in VANET networks
Method, whole network vehicle from group, serve as the producer, consumer and turn originator various rolls, vehicle by each vehicle node
Forwarding and the caching of row information can be entered by NDN mechanism, and allow that vehicle drivers are rapidly and efficiently looked into by other vehicles
Ask the traffic relevant information in a certain geographical position, and the central server without being used under traditional mode.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of packet forwarding in the present invention.
Specific embodiment
The technical scheme of this patent is described in more detail with reference to specific embodiment.
A kind of method for referring to Fig. 1, Traffic information demonstration based on numerical nomenclature network and retrieval, specific steps are such as
Under：
(1) numerical nomenclature mechanism is advised：Name is divided into five Primary layers, five described Primary layers are respectively city
Area's name, road section, information category, time period, ID；For numerical nomenclature network, a set of rational numerical nomenclature
Mechanism is the basis of the forwarding of its efficient information and retrieval.Such as five Primary layers for " Chaoyang District, Beijing City/west hope greatly the south of road section/
Repair the roads/8:00—9:00/ capital VNDN0368 ", wherein time section are time when data are produced；First four layers user for convenience
Retrieval information and design, and ID is designed to ensure information safety, while also ensure that the uniqueness of data herein；
So on the one hand name can accomplish that unique data is named with location data by different level；On the other hand can also be according to different inspections
Rope granularity goes to inquire about data, reaches the effect for meeting user's different demands, for example：
(1) interest bag is entitled " south of road section/is hoped greatly in Chaoyang District, Beijing City/west ", then it represents that the west of inquiry Chaoyang District, Beijing City
It is big to hope south of road section all kinds and the data message under all time periods；
(2) interest bag is entitled " Chaoyang District, Beijing City/west prestige south of road section greatly/repair the roads/", then it represents that inquiry Chaoyang District, Beijing City
It is western big to hope that south of road section is only the data message repaired the roads under species in all time periods；
(3) entitled " south of road section/repair the roads/8 is hoped greatly in Chaoyang District, Beijing City/west to interest bag:00—9:00/ ", then it represents that inquiry
West DaWang Road, Chaoyang District, BeiJing City south section is 8:00—9:The data message of the species of repairing the roads in 00 time period.
The ID is when VANET networks are built, the vehicle user entered under the network to be recognized safely in VANET
Real name register account number under card center, during in order to later stage security maintenance, such as someone's issue deceptive information, other vehicles can be lifted
Report, VANET administrative centers are punished it accordingly.
(2) method of Traffic information demonstration：After the packet that source vehicle node will be produced is to around forwarding, the car for receiving
Continue outwards broadcast forwarding after nodal cache this packet；Issued when a car finds traffic accident (traffic accident, construction etc.)
Information, is transmitted to surrounding vehicles by this information afterwards, make the information it is as much as possible be covered in by information produce ground centered on
In the range of, improve the recall precision and data answering rate of other vehicle nodes.
After the packet that source vehicle node will be produced is to around forwarding, it is follow-up that the vehicle node for receiving caches this packet
Continuous outwards broadcast forwarding, to expand the scope of Information expansion.But in order to anti-packet here is always to external diffusion, the position of arrival
Put far apart from source node, now the node of surrounding may not be needed the data of source node location, such diffusion not only has no
The resource such as destination busy channel propagation and spatial cache.So the design of this algorithm adds a location geography in packet
Location field, stores the information in residing geographical position when the data are produced, to know when other vehicle receivers are to this packet
Away from the distance of this incident point, thus just can control to spread model by radius value of the control data bag centered on source node
Enclose.On the other hand because packet continues outwards forwarding diffusion, now it is likely to appear in a traffic density larger
Place, information is forwarded back and forth in these vehicles, and the interference of so broadcast is higher than larger, packet loss, then adds again in packet
One upper node geo-location field, stores the geographical location information of a upper node, so that other vehicle receivers are counted to this
The distance away from a upper vehicle node is known during according to bag, it is possible thereby to pass through the node that the distance value goes to determine to continue to forward again.
To distinguish packet in addition is the data or have the later reply data of request that the active that source node is produced outwards is forwarded, because
It is different to the forwarding mechanism of both to be, so packet is further added by an attribute field, is worth for 1 indicates it is the repeater-transmitter
The lower data for actively producing of system.
Geographic location field when active data is produced, upper node geo position are added on packet in the step (2)
Put field and attribute field.
(3) forwarding mechanism：When data flow forwarding, first determine whether the data for receiving whether be the life of main movable property number
According to, forwarded and cached if not then being recorded according to PIT list items, otherwise further determine whether to be what Current vehicle was produced
Data, will be first data buffer storage in local cache when being the data of Current vehicle node generation, and then outwards broadcast turns
Hair；When not being the data of Current vehicle generation, then it is assumed that be that passively have received the data, will now check it in PIT tables
In whether have respective items, if it has, be then first buffered in it is local, then according to the whole forwarding numbers of the sets of interfaces recorded in PIT list items
According to bag；If there is no occurrence in PIT tables, first cache, geographical position when source data is produced then is taken out from packet
Field, the distance value for calculating geographical position when present node is produced with source data is denoted as disa, and upper one is further taken out if less than 6km
The value of node geo-location field, calculates current location and is denoted as disb with the distance of upper node geo-location field, works as disa<
6km and disb>Just the broadcast of this data is forwarded during 100m, otherwise treatment terminates.
(4) transport information search mechanism：When driver will inquire about the transport information in a certain geographical position, to surrounding neighbours car
Node sends interest bag request data, and other vehicles first go in inquiry local cache whether there is the number for meeting after receiving interest bag
According to if then returning, in the interface of content name and reception interest bag recorded into PIT list items without if, so that number
According to energy backtracking, then proceed to forward interest bag to neighbours' vehicle node；When there is packet to return, this is first buffered in
Ground, then the interface number in PIT list items is sent to previous requestor, then this PIT list item is deleted.
In a mobile network, NDN has born support advantage to mobility.Mobile vehicle user leaves origin-location, only
Again to apply obtaining data just can be with, and data may be regained near new position, without with original number
Connection is kept according to source and re-establish connection.NDN do not have center, the pattern without level be more suitable for support do not have it is structured
VANET networks.
The present invention does not use Traffic information demonstration based on NDN mechanism and the retrieval of central server in VANET networks
Method, whole network vehicle from group, serve as the producer, consumer and turn originator various rolls, vehicle by each vehicle node
Forwarding and the caching of row information can be entered by NDN mechanism, and allow that vehicle drivers are rapidly and efficiently looked into by other vehicles
Ask the traffic relevant information in a certain geographical position, and the central server without being used under traditional mode.
The better embodiment to this patent is explained in detail above, but this patent is not limited to above-mentioned embodiment party
Formula, in the ken that one skilled in the relevant art possesses, can also be on the premise of this patent objective not be departed from
Make a variety of changes.
Claims (4)
1. a kind of Traffic information demonstration based on numerical nomenclature network with retrieval method, it is characterised in that comprise the following steps that：
(1) numerical nomenclature mechanism is advised：Name is divided into five Primary layers, five described Primary layers are respectively metropolitan district
Name, road section, information category, time period, ID；
(2) method of Traffic information demonstration：After the packet that source vehicle node will be produced is to around forwarding, the vehicle section for receiving
Continue outwards broadcast forwarding after point cache this packet；
(3) transport information search mechanism：When driver will inquire about the transport information in a certain geographical position, to surrounding neighbours vehicle section
Point sends interest bag request data, and other vehicles first go in inquiry local cache whether there is the data for meeting after receiving interest bag, such as
Fruit has, and returns, in the interface of content name and reception interest bag recorded into PIT list items without if, so that data can be former
Road returns, and then proceedes to forward interest bag to neighbours' vehicle node；When there is packet to return, first it is buffered in locally, then
Interface number in PIT list items is sent to previous requestor, then this PIT list item is deleted.
2. the method for the Traffic information demonstration based on numerical nomenclature network according to claim 1 and retrieval, its feature exists
In the ID is that when VANET networks are built, the vehicle user that will enter under the network is in VANET safety certifications
Real name register account number under the heart.
3. the method for the Traffic information demonstration based on numerical nomenclature network according to claim 1 and retrieval, its feature exists
In geographic location field, a upper node geo-location field when active data generation is added on the packet in the step (2)
And attribute field.
4. the method for the Traffic information demonstration based on numerical nomenclature network according to claim 1 and retrieval, its feature exists
In the forwarding mechanism that packet forwarding is carried out in the step (2) is as follows：When data flow forwarding, first determine whether to receive
To data whether be the life of main movable property data, if not then being forwarded and being cached according to PIT list items record, otherwise enter one
Step determines whether the data that Current vehicle is produced, and first data buffer storage will be existed when being the data of Current vehicle node generation
In local cache, then outwards broadcast forwarding；When not being the data of Current vehicle generation, then it is assumed that be that passively have received the number
According to, now will check whether it has respective items in PIT tables, if it has, be then first buffered in it is local, then according to PIT list items
The sets of interfaces of middle record all forwards packet；If there is no occurrence in PIT tables, first cache, then from packet
Geographic location field when source data is produced is taken out, the distance value for calculating geographical position when present node is produced with source data is denoted as
Disa, the value of upper node geo-location field is further taken out if less than 6km, calculates current location and a upper node geo-location
The distance of field is denoted as disb, works as disa<6km and disb>Just the broadcast of this data is forwarded during 100m, is otherwise processed
Terminate.
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| CN107872400A (en) * | 2017-12-20 | 2018-04-03 | 北京工业大学 | Multi-audio-frequency document distribution method based on NDN in a kind of VANET |
| CN111127937A (en) * | 2019-12-30 | 2020-05-08 | 北京梧桐车联科技有限责任公司 | Traffic information transmission method, device and system and storage medium |
| CN111314885A (en) * | 2020-02-28 | 2020-06-19 | 长安大学 | City internet-of-vehicles communication method based on named data network |
| CN111435945A (en) * | 2019-01-15 | 2020-07-21 | 厦门雅迅网络股份有限公司 | Automobile Ethernet communication method, terminal equipment and storage medium |
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| CN115460255A (en) * | 2022-09-23 | 2022-12-09 | 电子科技大学 | Named data network system based on block chain |
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