CN106936861A - The method and onboard system of node capacity are improved in vehicular ad hoc net - Google Patents

Abstract

The invention discloses a method and a vehicle-mounted system for increasing node capacity in a vehicle-mounted ad hoc network. The system includes a radio frequency module and an antenna, a GPS module for obtaining vehicle-mounted node position information and driving direction information, and a database for storing dense road section position information. , a frequency point adjustment module for adjusting the central frequency point of the radio frequency module according to the position information of the vehicle node and the driving direction. When the position information of the vehicle node obtained by the GPS module corresponds to the position information of a dense road section in the database, the frequency point The adjustment module adjusts the central frequency point of the radio frequency module according to the position information and driving direction of the vehicle-mounted node, and divides the communication area on the dense road section into multiple sub-communication areas, and the vehicle-mounted nodes in the multiple sub-communication areas correspond to multiple different central frequency points , the vehicle-mounted nodes in the same sub-communication area set the same center frequency point. The invention can ensure that the node capacity of the communication area is increased without changing the node capacity.

Description

Method for increasing node capacity in vehicular ad hoc network and vehicular system

technical field

The invention relates to a method for increasing node capacity in a vehicle-mounted ad hoc network and a vehicle-mounted system, belonging to the technical field of the Internet of Vehicles.

Background technique

The Internet of Vehicles is the communication between vehicles and vehicles, vehicles and people, vehicles and roadside equipment through short-distance communication technologies such as wireless communication, GPS/GIS, and sensors, and can realize information extraction, sharing and efficient use.

The vehicle-mounted ad hoc network is a network organization form of the Internet of Vehicles. The network structure of the vehicle-mounted ad hoc network is shown in Figure 1. The GPS module obtains information such as the position and driving direction of the vehicle-mounted nodes, and the radio frequency module of each vehicle-mounted node uses a specific frequency (Only vehicle-mounted nodes with the same central frequency point of the radio frequency signal can recognize each other and maintain normal communication) Receive and send data through the antenna, the data received by the antenna is processed by the physical layer and the MAC layer and then transmitted to the application layer, and the application layer sends After being processed by the MAC layer and the physical layer, the data is broadcast and sent through the antenna.

Vehicle-mounted nodes need to follow a specific protocol when accessing the network, such as the RR-ALOHA (ReliableReservation ALOHA) protocol. Each vehicle-mounted node maintains a time slot state table, and selects an idle time slot from the time slot state table as the basic time slot when accessing a channel Send data and control information, where the number of nodes in the time slot state table is the node capacity, which represents the number of vehicle-mounted nodes that can communicate in the network, and the node capacity is set too small, so that the vehicle-mounted nodes in the communication area exceed the node capacity value Unable to access the network, the node capacity setting is too large, which will cause a long communication cycle between vehicle nodes, reducing the real-time communication and communication efficiency.

Contents of the invention

In view of the above-mentioned reasons, the object of the present invention is to provide a method and a vehicle-mounted system for improving node capacity in a vehicle-mounted ad hoc network, divide the communication area into a plurality of sub-communication areas according to the position information and the driving direction of the vehicle-mounted nodes, and improve the communication area in the communication area. node capacity.

To achieve the above object, the present invention adopts the following technical solutions:

A vehicle-mounted system for improving node capacity in a vehicle-mounted ad hoc network, including a radio frequency module and an antenna, and

A GPS module used to obtain vehicle node location information and driving direction information,

A database for storing location information of dense road sections,

A frequency point adjustment module for adjusting the central frequency point of the radio frequency module according to the position information of the vehicle node and the driving direction,

When the position information of the vehicle node acquired by the GPS module corresponds to the position information of a dense road section in the database, the frequency adjustment module adjusts the center frequency of the radio frequency module according to the position information of the vehicle node and the driving direction.

The frequency point adjustment module adjusts the central frequency point of the radio frequency module according to the position information and driving direction of the vehicle-mounted nodes in the communication area in the dense road section, and divides the communication area into multiple sub-communication areas. The vehicle-mounted nodes correspond to multiple different central frequency points, and the vehicle-mounted nodes in the same sub-communication area are set with the same central frequency point.

A method for increasing node capacity in a vehicular ad hoc network, comprising:

Obtain the location information and driving direction information of the vehicle node;

When the vehicle-mounted node drives into the preset dense road section position, adjust the central frequency point of the radio frequency module according to the position information and driving direction of the vehicle-mounted node, and divide the communication area on the dense road section into multiple sub-communication areas. The vehicle-mounted nodes correspond to multiple different central frequency points, and the vehicle-mounted nodes in the same sub-communication area are set with the same central frequency point.

The method for improving node capacity in the vehicle-mounted ad hoc network also includes: obtaining the position information and driving direction information of the vehicle-mounted node in real time, and adjusting the center frequency point of the radio frequency module of the vehicle-mounted node to the original position after the vehicle-mounted node drives out of the dense road section center frequency point.

The communication area on dense road sections is divided into multiple sub-communication areas according to the road direction and the number of effective vehicle nodes in the area.

The advantages of the present invention are:

The method for improving node capacity and the vehicle-mounted system in the vehicle-mounted ad hoc network of the present invention, in combination with the actual situation of road traffic, divides the communication area into multiple sub-communication areas according to the position information and driving direction of the vehicle-mounted nodes in dense road sections, and different sub-communication areas The vehicle-mounted nodes in the area correspond to different central frequency points. Since the node capacity of the vehicle-mounted nodes in the same sub-communication area remains unchanged, the node capacity of the sub-communication area is increased, and the node capacity of the communication area is increased.

Description of drawings

Figure 1 is a schematic diagram of the network structure of the vehicle ad hoc network.

Fig. 2 is a block diagram of the system architecture of the present invention.

Fig. 3 is a flow chart of the method of the present invention.

Fig. 4 is a schematic diagram of the communication area of the first embodiment of the present invention.

Fig. 5 is a schematic diagram of dividing the communication area shown in Fig. 4 into sub-communication areas (one of them) by using the method of the present invention.

Fig. 6 is a schematic diagram of a communication area of a second specific embodiment of the present invention.

FIG. 7 is a schematic diagram of dividing the communication area shown in FIG. 6 into sub-communication areas (one of them) by using the method of the present invention.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Fig. 2 is a system architecture block diagram of the present invention, as shown in the figure, the vehicle-mounted system for improving node capacity in the vehicle-mounted ad hoc network disclosed by the present invention includes a GPS module for obtaining vehicle-mounted node position information and driving direction information, for storing The database of location information of dense road sections is used to adjust the frequency point adjustment module of the central frequency point of the radio frequency module according to the vehicle node location information and driving direction.

As shown in Figure 3, using the method for improving node capacity in the vehicle-mounted ad hoc network disclosed by the present invention, the method for improving the node capacity in the communication area is: the GPS module obtains the position information and the driving direction information of the vehicle-mounted node in real time; The location information searches the database. When the location information of the vehicle node corresponds to the location information of a dense road section stored in the database, the frequency point adjustment module The communication area on the Internet is divided into multiple sub-communication areas, and the vehicle-mounted nodes in the multiple sub-communication areas correspond to multiple different central frequency points, and the vehicle-mounted nodes in the same sub-communication area are set with the same central frequency point.

As shown in Figures 4 and 5, the vehicle-mounted nodes in the communication area (circular area) on dense expressway sections are divided into two sub-communication areas according to the two driving directions from south to north and from north to south. One of the sub-communication areas The center frequency point of the vehicle-mounted node in the sub-communication area is set as the first center frequency point, and the center frequency point of the vehicle-mounted node in another sub-communication area is set as the second center frequency point different from the first center frequency point; each sub-communication area The vehicle-mounted nodes in the communication area travel in the same direction, and the node capacity of the vehicle-mounted nodes remains unchanged, which improves the node capacity in the sub-communication area and increases the node capacity in the communication area.

As shown in Figures 6 and 7, the vehicle-mounted nodes in the communication area (circular area) on the dense road section of the overpass are arranged in the order of going from south to north on the bridge, from north to south on the bridge, from east to west under the bridge, and from west to east under the bridge. A total of two floors (on the bridge and under the bridge), four driving directions are divided into four sub-communication areas, the center frequency point of the vehicle-mounted node in the first sub-communication area is the first center frequency point, and the vehicle-mounted nodes in the second sub-communication area The center frequency point of the node is the second center frequency point, the center frequency point of the vehicle-mounted node in the third sub-communication area is the third center frequency point, and the center frequency point of the vehicle-mounted node in the fourth sub-communication area is the fourth center frequency point point (first central frequency point≠second central frequency point≠third central frequency point≠fourth central frequency point); vehicle-mounted nodes in each sub-communication area are on the same floor and travel in the same direction, and the node capacity of vehicle-mounted nodes remains unchanged , the node capacity in the sub-communication area is improved, and the node capacity in the communication area is improved.

As shown in Figure 3, the GPS module obtains the location information and driving direction information of the vehicle node in real time. When the vehicle node drives out of the dense road section, the frequency point adjustment module readjusts the center frequency point of the radio frequency module of the vehicle node to the original center frequency. point.

The above specific embodiments are only used to illustrate the technical solution of the present invention, and are not used to limit the present invention. According to the actual situation of road traffic, the communication area on the dense road section can be divided into Multiple sub-communication areas to increase the node capacity in the communication area and improve the communication efficiency of vehicle nodes.

The location of the dense road section may be a road traffic area with a high traffic flow density such as an expressway, an overpass, an intersection, and a commercial center.

The above are the preferred embodiments of the present invention and the technical principles used therefor. For those skilled in the art, without departing from the spirit and scope of the present invention, any technical solution based on the present invention Obvious changes such as equivalent transformation and simple replacement all fall within the protection scope of the present invention.

Claims (5)

1. The vehicle-mounted system for improving node capacity in the vehicle-mounted self-organizing network, including a radio frequency module and an antenna, is characterized in that it also includes: A GPS module used to obtain vehicle node location information and driving direction information, A database for storing location information of dense road sections, A frequency point adjustment module for adjusting the central frequency point of the radio frequency module according to the position information of the vehicle node and the driving direction, When the position information of the vehicle node acquired by the GPS module corresponds to the position information of a dense road section in the database, the frequency adjustment module adjusts the center frequency of the radio frequency module according to the position information of the vehicle node and the driving direction. 2. According to the vehicle-mounted system improving node capacity in the vehicle-mounted ad hoc network, it is characterized in that the frequency point adjustment module adjusts the center frequency of the radio frequency module according to the position information and the driving direction of the vehicle-mounted nodes in the communication area in the dense road section point, the communication area is divided into multiple sub-communication areas, the vehicle-mounted nodes in multiple sub-communication areas correspond to multiple different central frequency points, and the vehicle-mounted nodes in the same sub-communication area are set with the same central frequency point. 3. The method for improving node capacity in a vehicular ad hoc network, characterized in that it comprises: Obtain the location information and driving direction information of the vehicle node; When the vehicle-mounted node drives into the preset dense road section position, adjust the central frequency point of the radio frequency module according to the position information and driving direction of the vehicle-mounted node, and divide the communication area on the dense road section into multiple sub-communication areas. The vehicle-mounted nodes correspond to multiple different central frequency points, and the vehicle-mounted nodes in the same sub-communication area are set with the same central frequency point. 4. the method for improving node capacity in the vehicle-mounted ad hoc network according to claim 3, is characterized in that, also comprises: obtain the position information of vehicle-mounted node and driving direction information in real time, when vehicle-mounted node drives out of described dense road section position , adjust the center frequency point of the radio frequency module of the vehicle node to the original center frequency point. 5. the method for improving node capacity in the vehicle-mounted ad hoc network according to claim 3 is characterized in that, the communication area on the dense road section is divided into a plurality of sub-communication areas according to the road direction and the effective vehicle-mounted node number in the area.