CN106936861B - The method and onboard system of node capacity are improved in vehicular ad hoc net - Google Patents
The method and onboard system of node capacity are improved in vehicular ad hoc net Download PDFInfo
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- CN106936861B CN106936861B CN201511008789.6A CN201511008789A CN106936861B CN 106936861 B CN106936861 B CN 106936861B CN 201511008789 A CN201511008789 A CN 201511008789A CN 106936861 B CN106936861 B CN 106936861B
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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 present invention discloses the method and onboard system that node capacity is improved in a kind of vehicular ad hoc net, system includes radio-frequency module and antenna, for obtaining vehicle-mounted node location information, the GPS module of transmits information, for storing the database of intensive section location information, frequency point for the center frequency point according to vehicle-mounted node location information and driving direction adjustment radio-frequency module adjusts module, when the location information for the vehicle-mounted node that GPS module obtains is corresponding with the intensive section location information of certain in database, frequency point adjusts the center frequency point that module adjusts radio-frequency module according to the location information and driving direction of vehicle-mounted node, by the communication region partitioning on intensive section at multiple sub- communication zones, vehicle-mounted node in multiple sub- communication zones corresponds to multiple different center frequency points, vehicle-mounted node setting in same sub- communication zone Identical center frequency point.In the case that the present invention can guarantee not concept transfer capacity, the node capacity of communication zone is improved.
Description
Technical field
The present invention relates to methods and onboard system that node capacity is improved in a kind of vehicular ad hoc net, belong to car networking skill
Art field.
Background technique
Car networking be by wireless communication, the vehicle realized of the short-range communication techniques such as GPS/GIS, sensing and vehicle, Che Yuren,
Communication between vehicle and roadside device, and can be in the extraction for realizing information on information network platform, shared and effective use.
Vehicular ad hoc net is a kind of network organization form of car networking, the network structure of vehicular ad hoc net such as Fig. 1 institute
Show, GPS module obtains the information such as the position of vehicle-mounted node, driving direction, and the radio-frequency module of each vehicle-mounted node is with specific frequency
(can only be mutually distinguishable between the identical vehicle-mounted node of radiofrequency signal center frequency point and keep normal communication) passes through antenna
Receive, send data, the received data of antenna through physical layer, MAC layer processing after be transmitted to application layer, the number that application layer is sent
Broadcast transmission is carried out through antenna according to after the processing of MAC layer, physical layer.
It needs to follow specific agreement when vehicle-mounted node access networks network, such as RR-ALOHA (Reliable Reservation
ALOHA) agreement, each vehicle-mounted node maintenance time slot state table select free timeslot to make when accessing channel from the time slot state table
Data and control information is sent for basic time slot, wherein the number of nodes in time slot state table is node capacity, represents net
It can be realized the vehicle-mounted number of nodes of communication in network, node capacity setting is too small, so that being more than node capacity value in communication zone
Vehicle-mounted node can not access network, node capacity setting is excessive, and it is long to will cause communication cycle between vehicle-mounted node, reduces communication
Real-time and communication efficiency.
Summary of the invention
In view of the foregoing, the purpose of the present invention is to provide a kind of methods that node capacity is improved in vehicular ad hoc net
And onboard system, communication region partitioning is mentioned at multiple sub- communication zones according to the location information of vehicle-mounted node and driving direction
Node capacity in high communication zone.
To achieve the above object, the invention adopts the following technical scheme:
The onboard system of node capacity, including radio-frequency module and antenna are improved in a kind of vehicular ad hoc net, and
For obtaining the GPS module of vehicle-mounted node location information, transmits information,
For storing the database of intensive section location information,
Frequency point for the center frequency point according to vehicle-mounted node location information and driving direction adjustment radio-frequency module adjusts mould
Block,
Certain the intensive section location information in the location information and the database for the vehicle-mounted node that the GPS module obtains
When corresponding, which adjusts the center frequency that module adjusts the radio-frequency module according to the location information and driving direction of vehicle-mounted node
Point.
Location information and traveling side of the frequency point adjustment module according to the vehicle-mounted node in intensive section in communication zone
To the center frequency point of the radio-frequency module being adjusted, by the communication region partitioning at multiple sub- communication zones, multiple sub- communication zones
In vehicle-mounted node correspond to multiple different center frequency points, identical center is arranged in the vehicle-mounted node in same sub- communication zone
Frequency point.
The method of node capacity is improved in a kind of vehicular ad hoc net, comprising:
Obtain the location information and transmits information of vehicle-mounted node；
When vehicle-mounted node drives into preset intensive section position, according to the location information of vehicle-mounted node and driving direction tune
The center frequency point of whole radio-frequency module, by the communication region partitioning on intensive section at multiple sub- communication zones, multiple sub- comunication areas
Vehicle-mounted node in domain corresponds to multiple different center frequency points, and the vehicle-mounted node in same sub- communication zone is arranged in identical
Heart frequency point.
In vehicular ad hoc net improve node capacity method, further includes: obtain in real time vehicle-mounted node location information and
Transmits information adjusts the center frequency of the radio-frequency module of vehicle-mounted node after vehicle-mounted node is driven out to the intensive section position
It puts to original center frequency point.
Communication zone on intensive section is divided into multiple sons according to vehicle-mounted number of nodes effective in trend of road, region to lead to
Believe region.
The invention has the advantages that
The method and onboard system that node capacity is improved in vehicular ad hoc net of the invention, in conjunction with the reality of road traffic
Situation, in intensive section according to the location information and driving direction of vehicle-mounted node by communication region partitioning at multiple sub- comunication areas
Domain, and the vehicle-mounted node in different sub- communication zones corresponds to different center frequency points, due to vehicle-mounted section in same sub- communication zone
The node capacity of point is constant, thus improves the node capacity of sub- communication zone, improves the node capacity of communication zone.
Detailed description of the invention
Fig. 1 is the schematic network structure of vehicular ad hoc network.
Fig. 2 is system architecture block diagram of the invention.
Fig. 3 is flow chart of the method for the present invention.
Fig. 4 is the schematic diagram of the communication zone of the first specific embodiment of the invention.
It by communication region partitioning shown in Fig. 4 is that sub- communication zone (one of them) being shown that Fig. 5, which is using method of the invention,
It is intended to.
Fig. 6 is the schematic diagram of the communication zone of the second specific embodiment of the invention.
It by communication region partitioning shown in Fig. 6 is that sub- communication zone (one of them) being shown that Fig. 7, which is using method of the invention,
It is intended to.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described in further detail.
Fig. 2 is system architecture block diagram of the invention, as shown, improving node in vehicular ad hoc net disclosed by the invention
The onboard system of capacity, it is close for storing including the GPS module for obtaining vehicle-mounted node location information, transmits information
The database for collecting section location information, for the center frequency according to vehicle-mounted node location information and driving direction adjustment radio-frequency module
The frequency point of point adjusts module.
As shown in figure 3, improving the comunication area using the method for improving node capacity in vehicular ad hoc net disclosed by the invention
The method of domain interior nodes capacity is: GPS module obtains the location information and transmits information of vehicle-mounted node in real time；Using vehicle-mounted
The location information of node searches database, when the intensive section position of a certain item stored in the location information and database of vehicle-mounted node
Confidence manner of breathing adjusts the center of radio-frequency module to frequency point adjustment module when corresponding to according to the location information and driving direction of vehicle-mounted node
Frequency point, the vehicle-mounted node pair by the communication region partitioning on intensive section at multiple sub- communication zones, in multiple sub- communication zones
Multiple different center frequency points are answered, identical center frequency point is arranged in the vehicle-mounted node in same sub- communication zone.
As shown in Figure 4,5, by the vehicle-mounted node on the intensive section of highway in communication zone (border circular areas) according to by
South orientation north is divided into two sub- communication zones by southern two driving directions of north orientation, the vehicle-mounted section in one of them sub- communication zone
The center frequency point of point is set as the first center frequency point, and the center frequency point of the vehicle-mounted node in another sub- communication zone is set as phase
Different from the second center frequency point of the first center frequency point；Vehicle-mounted node driving direction in every sub- communication zone is identical and vehicle-mounted
The node capacity of node is constant, improves the node capacity in sub- communication zone, improves the node capacity in communication zone.
As shown in Figure 6,7, by the vehicle-mounted node on the intensive section of viaduct in communication zone (border circular areas) according on bridge
From south to north, on bridge by north orientation south, under bridge from east to west, two layers totally (on bridge, under bridge), four driving directions from west to east under bridge
It is divided into four sub- communication zones, the center frequency point of the vehicle-mounted node in the first sub- communication zone is the first center frequency point, second
The center frequency point of vehicle-mounted node in sub- communication zone is the second center frequency point, in the vehicle-mounted node in the sub- communication zone of third
Heart frequency point is third center frequency point, the center frequency point of vehicle-mounted node in the 4th sub- communication zone is the 4th center frequency point (first
Center frequency point ≠ the second center frequency point ≠ third center frequency point ≠ the 4th center frequency point)；Vehicle-mounted section in every sub- communication zone
Point is in same layer and driving direction is identical, and the node capacity of vehicle-mounted node is constant, and the node improved in sub- communication zone holds
Amount, improves the node capacity in communication zone.
As shown in figure 3, GPS module obtains the location information and transmits information of vehicle-mounted node in real time, when vehicle-mounted node
After being driven out to intensive section, frequency point adjustment module again adjusts the center frequency point of the radio-frequency module of vehicle-mounted node to original center
Frequency point.
Above-mentioned specific embodiment is only used to illustrate the technical scheme of the present invention, and is not intended to restrict the invention, according to road
The actual conditions of traffic, can be by the communication zone on intensive section according to items such as vehicle-mounted number of nodes effective in trend of road, region
Part is divided into multiple sub- communication zones, to improve the node capacity in communication zone, improves the communication efficiency of vehicle-mounted node.
It is big that the intensive section position can be the wagon flows metric density such as highway, viaduct, intersection, commercial center
Road traffic region.
The above is presently preferred embodiments of the present invention and its technical principle used, for those skilled in the art
For, without departing from the spirit and scope of the present invention, any equivalent change based on the basis of technical solution of the present invention
Change, simple replacement etc. is obvious changes, all fall within the protection scope of the present invention.
Claims (3)
1. improving the onboard system of node capacity, including radio-frequency module and antenna in vehicular ad hoc net, which is characterized in that also wrap
It includes:
For obtaining the GPS module of vehicle-mounted node location information, transmits information,
For storing the database of intensive section location information,
Frequency point for the center frequency point according to vehicle-mounted node location information and driving direction adjustment radio-frequency module adjusts module,
When the location information for the vehicle-mounted node that the GPS module obtains is opposite with certain intensive section location information in the database
At once, frequency point adjustment module adjusts the center frequency point of the radio-frequency module according to the location information and driving direction of vehicle-mounted node；
The frequency point adjustment module is adjusted according to the location information and driving direction of the vehicle-mounted node in intensive section in communication zone
The center frequency point of the whole radio-frequency module, by the communication region partitioning at multiple sub- communication zones, in multiple sub- communication zones
Vehicle-mounted node corresponds to multiple different center frequency points, and identical center frequency is arranged in the vehicle-mounted node in same sub- communication zone
Point；Wherein, sub- communication zone is divided according to vehicle-mounted number of nodes effective in trend of road, region, in the sub- communication zone
Vehicle-mounted node driving direction it is identical.
2. improving the method for node capacity in vehicular ad hoc net characterized by comprising
Obtain the location information and transmits information of vehicle-mounted node；
When vehicle-mounted node drives into preset intensive section position, penetrated according to the location information of vehicle-mounted node and driving direction adjustment
The center frequency point of frequency module, by the communication region partitioning on intensive section at multiple sub- communication zones, in multiple sub- communication zones
Vehicle-mounted node correspond to multiple different center frequency points, identical center frequency is arranged in the vehicle-mounted node in same sub- communication zone
Point；Wherein, sub- communication zone is divided according to vehicle-mounted number of nodes effective in trend of road, region, in the sub- communication zone
Vehicle-mounted node driving direction it is identical.
3. improving the method for node capacity in vehicular ad hoc net according to claim 2, which is characterized in that further include:
The location information and transmits information for obtaining vehicle-mounted node in real time are adjusted after vehicle-mounted node is driven out to the intensive section position
Vehicle carries the center frequency point of the radio-frequency module of node to original center frequency point.
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| CN201511008789.6A CN106936861B (en) | 2015-12-29 | 2015-12-29 | The method and onboard system of node capacity are improved in vehicular ad hoc net |
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| CN201511008789.6A CN106936861B (en) | 2015-12-29 | 2015-12-29 | The method and onboard system of node capacity are improved in vehicular ad hoc net |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1833239A (en) * | 2003-05-12 | 2006-09-13 | 环航网络公司 | Methods for communicating between elements in a hierarchical floating car data network |
| CN103065472A (en) * | 2012-12-24 | 2013-04-24 | 中国科学院深圳先进技术研究院 | Real-time traffic status analysis method and real-time traffic status analysis system |
| CN103857059A (en) * | 2014-02-24 | 2014-06-11 | 上海大学 | EDCA mechanism optimizing method of IEEE 802.11P vehicle-mounted ad hoc network protocol |
| CN104408970A (en) * | 2014-10-28 | 2015-03-11 | 奇瑞汽车股份有限公司 | Vehicle alarm method and device |
-
2015
- 2015-12-29 CN CN201511008789.6A patent/CN106936861B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1833239A (en) * | 2003-05-12 | 2006-09-13 | 环航网络公司 | Methods for communicating between elements in a hierarchical floating car data network |
| CN103065472A (en) * | 2012-12-24 | 2013-04-24 | 中国科学院深圳先进技术研究院 | Real-time traffic status analysis method and real-time traffic status analysis system |
| CN103857059A (en) * | 2014-02-24 | 2014-06-11 | 上海大学 | EDCA mechanism optimizing method of IEEE 802.11P vehicle-mounted ad hoc network protocol |
| CN104408970A (en) * | 2014-10-28 | 2015-03-11 | 奇瑞汽车股份有限公司 | Vehicle alarm method and device |
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Effective date of registration: 20211224 Address after: 400040 No. 35, Jinghe Road, Huxi street, high tech Zone, Shapingba District, Chongqing Patentee after: Datang Gaohong Zhilian Technology (Chongqing) Co.,Ltd. Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road Patentee before: BEIJING GOHIGH DATA NETWORKS TECHNOLOGY Co.,Ltd. |
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Address after: Room 505, 5th Floor, Building 2, No. 299 Kexue Avenue, Zengjia Town, High tech Zone, Jiulongpo District, Chongqing, China 400040 Patentee after: CITIC Technology Zhilian Technology Co.,Ltd. Country or region after: China Address before: 400040 No. 35, Jinghe Road, Huxi street, high tech Zone, Shapingba District, Chongqing Patentee before: Datang Gaohong Zhilian Technology (Chongqing) Co.,Ltd. Country or region before: China |
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