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

Abstract

The invention discloses a method for improving node capacity in a vehicle-mounted self-organized network and a vehicle-mounted system. The system comprises a radio frequency module and an antenna, a GPS module for acquiring vehicle-mounted node position information and traveling direction information, a database for storing busy road section position information, and a frequency point adjusting module for adjusting a center frequency point of the radio frequency module according to the vehicle-mounted node information and the traveling direction position; when the vehicle-mounted node information acquired by the GPS module is corresponding to some busy road section position information in the database, the frequency point adjusting module adjusts the center frequency point of the radio frequency module according to the position information and the traveling direction of the vehicle-mounted node so as to divide a communication region on the busy road section into multiple sub communication regions, the vehicle-mounted nodes in multiple sub communication regions are corresponding to multiple different center frequency points, and the same center frequency point is arranged for the vehicle-mounted node in the same sub communication region. Under the condition of guaranteeing the unchanged of the node capacity, the node capacity of the communication region is improved.

Description

technical field [0001] 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 [0002] 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. [0003] The vehicle ad hoc network is a network organization form of the Internet of Vehicles. The network structure of the vehicle ad hoc network is as follows: figure 1 As shown, the GPS module obtains information such as the position and driving direction of the vehicle-mounted nodes, and the radio frequency modules of each vehicle-mounted node use a specific frequency (only the vehicle-mounted nodes with the same central frequency poi...

AI Technical Summary

Problems solved by technology

[0004] Vehicle-mounted nodes need to follow a specific protocol when accessing the network, such as RR-ALOHA (Reliable ReservationALOHA) 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, if the node capacity is set too large, it will cause a long communication cycle between vehicle nodes, reducing real-time communication and communication efficiency

Images