URLLC Over Slow Fading Channels: K-Repetition Versus Multi-Connectivity

IF 5.3 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Qingjiao Song;Fu-Chun Zheng;Jingjing Luo
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引用次数: 0

Abstract

In this work, we analyze the performance of the uplink ultra-reliable and low-latency communications (URLLC) for the low-mobility users (UEs) in a factory environment. The $K$-repetition scheme is a promising approach for improving URLLC reliability, but most studies so far have been carried out assuming fast fading. A UE with low mobility typically experiences a time-correlated slow fading channel. We therefore consider the effects of time correlation in analyzing the performance of a $K$-repetition scheme. On the other hand, multi-connectivity (MC) schemes can overcome such effects and improve reliability through space diversity. We then apply differential modulation to both schemes to support URLLC services, and compare their performance. The simulation results show that such slow fading channels severely decreases the time diversity of a $K$-repetition scheme, and the MC scheme outperforms the $K$-repetition scheme in terms of reliability and transmission latency.
慢衰落信道上的URLLC: k -重复与多连接
在这项工作中,我们分析了工厂环境下低移动性用户(ue)的上行超可靠和低延迟通信(URLLC)的性能。$K$重复方案是一种很有前途的提高URLLC可靠性的方法,但迄今为止大多数研究都是在假设快速衰落的情况下进行的。具有低迁移率的UE通常经历一个时间相关的慢衰落信道。因此,我们在分析K -重复方案的性能时考虑了时间相关的影响。另一方面,多连接(MC)方案可以克服这些影响,并通过空间分集提高可靠性。然后,我们将差分调制应用于两种方案以支持URLLC服务,并比较它们的性能。仿真结果表明,这种慢衰落信道严重降低了K -重复方案的时分集,MC方案在可靠性和传输延迟方面优于K -重复方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.60
自引率
0.00%
发文量
25
审稿时长
10 weeks
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