Abstract We investigate in this paper uplink transmission schemes for 5G Ultra-Reliable Low Latency Communications (URLLC) traffic. The URLLC class of services has been defined for applications requiring extremely stringent latency and reliability. We show that, in systems with episodic traffic and many users compared with the number of transmission resources, randomly transmitting multiple copies of a packet allows to meet the URLLC requirements. We first develop an analytical model for the packet loss rate for a contention based multiple transmission scheme where replica positions are assigned randomly and show that it allows to meet the performance requirements of URLLC for small enough user activity rate. We then propose an advanced replication scheme where positions for the different replicas are pre-allocated to users so that users have pairwise-distinct positions. We show that this advanced scheme achieves very high reliability with low resource consumption.

中文翻译：

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基于竞争的 URLLC 服务传输方案的设计与性能评估

摘要 我们在本文中研究了 5G 超可靠低延迟通信 (URLLC) 流量的上行链路传输方案。URLLC 服务类别是为需要极其严格的延迟和可靠性的应用程序定义的。我们表明，在具有间歇性流量和许多用户与传输资源数量相比的系统中，随机传输一个数据包的多个副本可以满足 URLLC 要求。我们首先开发了一个基于竞争的多传输方案的丢包率分析模型，其中副本位置是随机分配的，并表明它允许满足 URLLC 对足够小的用户活动率的性能要求。然后我们提出了一种高级复制方案，其中不同副本的位置预先分配给用户，以便用户具有成对不同的位置。我们表明，这种先进的方案以低资源消耗实现了非常高的可靠性。