Multi-channel MAC layer data adaptive transmission method for internet of vehicles, medium and system

Abstract

The invention discloses a multi-channel MAC layer data adaptive transmission method for the internet of vehicles, a medium and a system. The method comprises the following steps: channels are dividedinto a control channel and service channels through an MAC layer protocol based on multi-channel operation; a period of the control channel is divided into a broadcast period and a negotiation period;in the broadcast period, a vehicle node acquires vehicle state information sent by a neighbor vehicle node, and performs adaptive adjustment of the total number of MAC frame time slots according to the vehicle state information; the negotiation period adopts a contention type access mechanism, so that the vehicle node negotiates a use right of the corresponding service channel; the frame length of each service channel is determined according to a negotiation result; and the vehicle node in the internet of vehicles transmits service information with high-throughput requirements on the corresponding service channel, and transmits security service information and control signaling information on the control channel. Therefore, the transmission reliability of the security information is improved, the use fairness of the service channels is guaranteed, meanwhile, the channel utilization rate is improved, and the throughput requirements of service information transmission are met.

Description

technical field [0001] The invention relates to the technical field of the Internet of Vehicles, in particular to a method, medium and system for adaptive transmission of multi-channel MAC layer data in the Internet of Vehicles. Background technique [0002] Vehicle Ad-hoc Networks (VANETs), also known as the Internet of Vehicles, is one of the most recognized solutions for realizing intelligent transportation systems in academia and industry. [0003] In the existing IoV MAC protocol standards, the Dedicated Short Range Communication (DSRC) protocol is mainly used, and the MAC layer of the protocol adopts a binary backoff contention access mechanism based on CSMA / CA. When the density of vehicle nodes is high, vehicle nodes often cannot compete for channel resources and cause a large amount of packet loss. In addition, the hidden terminal problem in DSRC aggravates the message collision and reduces the communication efficiency, while the hidden terminal problem will greatly...

AI Technical Summary

Problems solved by technology

When the density of vehicle nodes is high, vehicle nodes often cannot compete for channel resources and cause a large amount of packet loss

In addition, the hidden terminal problem in DSRC aggravates the message collision and reduces the communication efficiency, while the hidden terminal problem will greatly reduce the throughput of the network

Therefore, the DSRC protocol cannot guarantee the reliable transmission of safety messages and the transmission throughput requirements of service messages in a complex Internet of Vehicles environment.

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