论文标题
URLLC如何受益于基于NOMA的重传
How URLLC can Benefit from NOMA-based Retransmissions
论文作者
论文摘要
在新兴的5G无线系统释放的新类型的连接性中，超可靠的低潜伏期通信（URLLC）也许是最具创新性但充满挑战的。超高可靠性需要高水平的多样性，但是，应仔细应用基于HARQ协议中的数据包重新传播的反应性方法，以符合严格的延迟约束。本文的主要前提是，通过允许在上行链路中同时使用无线资源，可以使用NOMA原理来实现高效的重传。我们引入了一个全面的解决方案，该解决方案可容纳多个间歇性活跃的用户，每个用户都有自己的HARQ流程。在两个关于通道状态信息（CSI）可用性的两个不同假设下进行了研究：统计和瞬时。结果表明，与所有HARQ过程正交运行的情况相比，NOMA确实可以导致高效的系统操作。
Among the new types of connectivity unleashed by the emerging 5G wireless systems, Ultra-Reliable Low Latency Communication (URLLC) is perhaps the most innovative, yet challenging one. Ultra-reliability requires high levels of diversity, however, the reactive approach based on packet retransmission in HARQ protocols should be applied carefully to conform to the stringent latency constraints. The main premise of this paper is that the NOMA principle can be used to achieve highly efficient retransmissions by allowing concurrent use of wireless resources in the uplink. We introduce a comprehensive solution that accommodates multiple intermittently active users, each with its own HARQ process. The performance is investigated under two different assumptions about the Channel State Information (CSI) availability: statistical and instantaneous. The results show that NOMA can indeed lead to highly efficient system operation compared to the case in which all HARQ processes are run orthogonally.
