Inspired by emerging applications in vehicular networks, we address the problem of achieving high-reliability and low-latency communication in multi-hop wireless networks. We propose a new family of Automatic-Repeat-Requests (ARQs) based cooperative strategies wherein high end-to-end reliability is obtained using packet re-transmissions at each hop while the low-latency constraint is met by imposing an upper bound on the total number of packet retransmissions across the network. A hallmark of our strategies is the one-hop listening capability wherein nodes utilize the unused ARQs of their preceding node just by counting the number of failed attempts due to decoding errors. We further extend the idea of one-hop listening to multi-hop listening, wherein a set of consecutive nodes form clusters to utilize the unused ARQs of the preceding nodes, beyond its nearest neighbour, to further improve reliability. Thus, our strategies provide the high-reliability feature with no compromise in the original latency-constraint. For the proposed strategies, we solve non-linear optimization problems on distributing the ARQs across the nodes so as to minimize packet drop probability (PDP) subject to a total number of ARQs in the network. Through extensive theoretical results on PDP and delay profiles, we show that the proposed strategies outperform the best-known strategies in this space.

翻译：在广域网中新兴应用的启发下,我们解决了在多跳无线网络中实现高可靠性和低延迟通信的问题。我们提出一个新的基于自动重复请求(ARQs)的合作战略,即每跳时使用包重新传输获得高端对端可靠性,而低延迟限制则通过对网络中包再传输的总数加上上限来应对。我们战略的一个标志是一振式倾听能力,即节点利用前节点未使用的前节点中未使用的ARQ,仅仅通过计算因解码错误而失败的尝试的数目。我们进一步将一振式倾听的想法扩大到多跳式倾听,其中一组连续的节点组成集群,以便利用前节点的未使用的ARQ,超越其近邻,进一步提高可靠性。因此,我们的战略提供了高可靠性特征,在原有的惯性控制中没有任何妥协。对于拟议的战略,我们解决了在将ARQs全部分布在无编码的尝试中的问题,我们解决了不线性优化问题,从而将AQ-Qs在无序式网络中,从而将AQ-DMR-Proforcht 显示一个最大的可能性降到了。