The extreme requirements for high reliability and low latency in the upcoming Sixth Generation (6G) wireless networks are challenging the design of multi-hop wireless transport networks. Inspired by the advent of the virtualization concept in the wireless networks design and openness paradigm as fostered by the O-RAN Alliance, we target a revolutionary resource allocation scheme to improve the overall transmission efficiency. In this paper, we investigate the problem of multi-hop decode-and-forward (DF) relaying in the finite blocklength (FBL) regime, and propose a DMH-HARQ scheme, which maximizes the end-to-end (E2E) communication reliability in the wireless transport network. We also propose an integer dynamic programming (DP) algorithm to efficiently solve the optimal DMH-HARQ strategy. Constrained within a certain time frame to accomplish E2E transmission, our proposed approach is proven to outperform the conventional listening-based cooperative ARQ, as well as any static HARQ strategy, regarding the E2E reliability. It is applicable without dependence on special delay constraint, and is particularly competitive for long-distance transport network with many hops.

翻译：即将到来的第六代（6G）无线网络对高可靠性与低时延的极端要求，对多跳无线传输网络的设计提出了挑战。受无线网络设计中虚拟化概念的兴起以及O-RAN联盟倡导的开放范式启发，我们旨在提出一种革命性的资源分配方案以提升整体传输效率。本文研究了有限码长（FBL）机制下的多跳解码转发（DF）中继问题，并提出了一种DMH-HARQ方案，该方案能够最大化无线传输网络中的端到端（E2E）通信可靠性。我们还提出了一种整数动态规划（DP）算法，以高效求解最优DMH-HARQ策略。在限定时间帧内完成端到端传输的约束下，所提方法在端到端可靠性方面被证明优于传统的基于侦听的协作ARQ以及任何静态HARQ策略。该方案无需依赖特殊的时延约束条件即可适用，尤其在对多跳长距离传输网络具有显著竞争力。