System capacity expansion method based on D2D communication model in ITS

Abstract

The invention discloses a system capacity expansion method based on a D2D communication model in an ITS. The method comprises a first method for conducting cooperative information transmission dispatching and bandwidth resource allocation among road test base stations, wherein RSU cooperative communication is applied to an Internet of Vehicles system, efficient cooperative allocation of communication channel bandwidth resources is realized through return cascading of RSUs, an efficient transmission dispatching protocol is adopted in the bandwidth resource allocation process, and the protocol is that each RSU can release corresponding wireless spectral bandwidth resources in time when vehicle nodes are transferred out of the coverage of the base stations and the RSUs can reserve the spectral bandwidth resources to be switched to the vehicle nodes in advance when the vehicle nodes are transferred in the coverage of the base stations; a second method for expanding capacity through adaptive signal power control, wherein a disperse power allocation method based on a bit allocation algorithm is adopted, that is, bit rates of all carriers are distributed adaptively according to the real-time states of subcarrier channels, and a corresponding power allocation algorithm is adopted for adaptive adjustment of transmitting power.

Description

technical field [0001] The invention belongs to the technical field of intelligent transportation ITS, and in particular relates to a system capacity expansion method based on a D2D communication model in ITS. Background technique [0002] With the development of the city, the degree of traffic congestion is increasing day by day. Only relying on the construction of traffic infrastructure can no longer meet the informatization needs of urban traffic development. In recent years, the developed countries in the world have attached great importance to the theoretical research and system development of traffic system management and control technology. Information interaction and safety control in road traffic conditions. [0003] As an emerging research topic in the field of communication, the use of direct-to-device technology (D2D, Device-to-Device) in the new cellular mobile communication system can obviously alleviate the two problems of the increasing number of mobile user...

AI Technical Summary

Problems solved by technology

On the other hand, the channel characteristics of the Internet of Vehicles make vehicle mobile terminals have faster mobility than pedestrians in general mobile cellular networks; this rapidly changing mobility makes it difficult for channel modeling and system communication capacity under ITS Computational research work is more challenging than the common operating cellular mobile communication network

[0007] To sum up, although there are already some typical communication channel models and data transmission scheduling schemes recognized by the academic and engineering circles in the channel model research and actual networking engineering of traditional cellular mobile networks, these models cannot be used directly In the ITS terminal direct-to-D2D communication system, it is obvious that it is necessary to perform reasonable channel parameter correction and bandwidth transmission scheduling strategy optimization based on the channel characteristics in the actual road environment and the real-time motion characteristics of the vehicle user terminal.

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