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 Open-Radio Access Network (O-RAN) Alliance, we target a revolutionary resource allocation scheme to improve the overall transmission efficiency. In this paper, we investigate the problem of automatic repeat request (ARQ) in multi-hop decode-and-forward (DF) relaying in the finite blocklength (FBL) regime, and propose a dynamic scheme of multi-hop hybrid ARQ (HARQ), 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 Dynamic Multi-Hop HARQ (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兴起以及开放无线接入网（O-RAN）联盟所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）机制下多跳解码转发（DF）中继中的自动重传请求（ARQ）问题，并提出了一种动态多跳混合自动重传请求（HARQ）方案，以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，以高效求解最优动态多跳HARQ（DMH-HARQ）策略。在限定时间帧内完成端到端传输的约束下，我们提出的方法被证明在端到端可靠性方面优于传统的基于侦听的协作ARQ以及任何静态HARQ策略。该方案不依赖于特定的时延约束条件即可适用，尤其适用于具有多跳的长距离传输网络，展现出显著竞争力。