ARQ Algorithm Optimization of Radio Link Control Layer in 5G System

Abstract

In the process of realizing the Radio Link Control layer of 5G system, ARQ mechanism is introduced to ensure the reliability of data retransmission, but at the same time, high delay and low throughput are also introduced in the retransmission. In addition, the traditional ARQ mechanism is inefficient and only applies to LTE systems. Therefore, an improved retransmission scheme based on wireless channel quality is proposed. The channel estimation is used to monitor the quality of the new channel in real time, and then compare the channel coefficient with the preset threshold value to adaptively select to receive feedback response. In addition, the sending and receiving scheme of the AM entity is designed in detail. The simulation result show that the ARQ mechanism proposed in this paper can achieve fast retransmission, significantly reduce the transmission delay, and increase the system throughput.