Method for combination of multichannel MAC protocol and TDMA in IOV

Abstract

The invention discloses a method for combination of a multichannel MAC (Media Access Control) protocol and TDMA (Time Division Media Access) in IOV (Internet of Vehicles), which overcomes the problems of low time slot utilization rate of a control channel CCH and a service channel SCH and high expense of channels in the prior art. The specific thought of the method is as follows: firstly , setting channel initialization; then, by a roadside unit RSU, negotiating time slot with a node, updating the time slot length of the control channel CCH based on a feedback condition of the node, and maintaining time slot distribution of two channel lists; and finally switching to the service channel SCH for data transmission. According to the method for combination of the multichannel MAC protocol and the TDMA in the IOV, as the roadside unit RSU controls the time slot length of the control channel CCH and the time slot distribution, the problems of low utilization rate of the channel and high channel expense under the condition of a varying vehicle density can be avoided efficiently, the throughput of the channel is increased , and the channel expense is reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a method for combining multi-channel Media Access Control MAC (Media Access Control) protocol and Time Division Multiple Access (TDMA) in the Internet of Vehicles in the technical field of wireless communication. The invention mainly aims at the non-safety business in the vehicle transmission, and considers the difference of node density to the channel requirement, proposes an algorithm combining variable control period and TDMA, and improves the channel utilization rate and the throughput of the non-safety information. Background technique [0002] In recent years, with the development of intelligent transportation, VANET has been extensively studied in coordinating the safe driving of vehicles and vehicles, and vehicles and the environment. Ask for more. This requires that the Internet of Vehicles can not only provide timely alarms and road conditions, but also tim...

AI Technical Summary

Problems solved by technology

Although this method uses time division multiple access to divide the channel, the disadvantage still exists in this method is that when the vehicle density changes, using the fixed-length time slot allocation of the control channel CCH will cause the control channel CCH or the service channel SCH to be time-consuming. slot waste or lack, without taking into account the channel utilization of these two;

Although this method utilizes the reservation mechanism to reserve the data channel, the method still has shortcomings. On the one hand, it is the low efficiency that a service channel SCH only transmits a group of services. On the other hand, through the improved three-way handshake Mechanism to reserve time slots, which increases channel overhead and transmission delay

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