The extreme requirements for high reliability and low latency in Beyond-Fifth-Generation (B5G) and Sixth Generation (6G) mobile systems are challenging the design of multihop relay networks. In this paper we investigate the problem of multi-hop decode-and-forward (DF) relaying in the finite blocklength (FBL) regime, and propose a dynamic multi-hop hybrid automated repeat request (DMH-HARQ) scheme, which maximizes the end-to-end (E2E) communication reliability in such systems. We also propose an integer dynamic programming (DP) algorithm to efficiently solve the optimal DMH-HARQ schedule. Constrained within a certain time frame to accomplish multi-hop relaying, our proposed approach is proven to outperform any static HARQ strategy regarding the E2E reliability.

翻译：第五代后和第六代(6G)移动系统高度可靠和低延迟的极端要求对多光速中继网络的设计提出了挑战。在本文件中,我们调查了在有限区长(FBL)系统中多光速解码和前向(DF)转发的问题,并提出了一个动态多光速混合自动重复请求(DMH-HARQ)计划,使这些系统中的终端到终端通信可靠性最大化。我们还提出了一个整数动态程序(DP)算法,以有效解决最佳的DMH-HARQ时间表。在一定的时间框架内,我们为完成多光速中继而进行了培训,我们提出的方法证明超过了任何关于E2E可靠性的静态HARQ战略。