D2D (Device-to-Device) communication collision correction cross-layer adaptive system and data transmission method

Abstract

The invention relates to a D2D (Device-to-Device) communication collision correction cross-layer adaptive system and a data transmission method. Through the D2D communication collision correction cross-layer adaptive system, data packets damaged in collision are recovered on the premise that one collision message is transmitted once. The D2D communication collision correction cross-layer adaptive system comprises a D2D transmitting node and a D2D receiving node, wherein the D2D transmitting node is used for selecting a corresponding modulation way according to a channel condition, and transmitting the modulation way to the D2D receiving node at the same time; the D2D receiving node comprises a physical layer and an MAC (Media Access Control) layer; the physical layer comprises a received packet caching module, a channel estimator collision correction decision module and an adaptive demodulation and decoding module; and the MAC layer comprises an MAC retransmission history module and a previous data packet selector. Compared with the prior art, the D2D communication collision correction cross-layer adaptive system and the data transmission method have the advantages that the reliability of a D2D security message in a transmission process can be enhanced; the success probability of data packet transmission is increased on the premise of reducing retransmission times; and the packet error rate is reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, relates to a collision correction cross-layer self-adaptive design technology for highly reliable D2D communication, and in particular to a D2D communication collision correction cross-layer self-adaption system and data transmission method. Background technique [0002] As a key technology of 5G communication, D2D communication makes up for the shortcomings of limited transmission distance and low reliability of security messages in Dedicated Short Range Communication (DSRC). In DSRC, the vehicle has active safety applications, and these active safety applications need to periodically broadcast the heartbeat information of the vehicle. The heartbeat information of the vehicle provides very important information, such as position, direction, speed, as well as vehicle safety and emergency messages, such as the deployment of airbags, accident reports, etc., thus ensuring that...

AI Technical Summary

Problems solved by technology

Considering the mobility of D2D nodes, the collision of data packets can greatly affect the reliability of communication and reduce the probability of successful data packet transmission.

In the case of a large number of D2D nodes and a large number of retransmissions, the optimization of the retransmission protocol cannot solve the problem of data conflicts at the MAC layer.

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