Paper Info
Title
Toward URLLC: A Full Duplex Relay System with Self-Interference Utilization or Cancellation
Abstract
Ultra-reliable low-latency communication (URLLC) is one of the key use cases of 5G wireless communications to facilitate specific application scenarios with stringent latency and reliability demands, such as industrial automation and Tactile Internet. A full duplex (FD) relay with simultaneous transmission and reception in the same frequency band is an effective approach to enhance the reliability of cell-edge user terminals by significantly suppressing self-interference (SI). However, the signal processing latency at FD relay due to SI cancellation, referred to as relaying latency, takes a significant part in the end-to-end latency, and therefore should be minimized, while guaranteeing high reliability. In this article, we first present an up-to-date overview of the end-to-end latency for an FD relay system, addressing physical layer challenges. We investigate the possible solutions in the literature to achieve the goal of URLLC. The efficient solution is to allow a simple amplify-and-forward FD relay mode with low-complexity SI radio frequency and analog cancellations, and process the residual SI alongside the desired signal at the base station in an adaptive manner, rather than being cancelled at relay in the digital domain. Also, the residual SI can be utilized at the base station to enhance the reliability and degree of freedom in signal processing, not necessarily being cancelled as much as possible. The FD relay assisted system with adaptive SI utilization or cancellation enables extended network coverage, enhanced reliability, and reduced latency compared to the existing overview work.
Year
DOI
Venue
2021
10.1109/MWC.001.2000238
IEEE Wireless Communications
Keywords
DocType
Volume
low-complexity SI radiofrequency cancellations,amplify-and-forward FD relay mode,end-to-end latency,minimization,5G wireless communications,URLLC,simultaneous transmission-and-reception,enhanced reliability,adaptive SI utilization,FD relay assisted system,base station,residual SI,analog cancellations,physical layer challenges,SI cancellation,signal processing,cell-edge user terminals,frequency band,ultra-reliable low-latency communication,self-interference utilization,full duplex relay system
Journal
28
Issue
ISSN
Citations 
1
1536-1284
1
PageRank 
References 
Authors
0.35
0
7
Name
Order
Citations
PageRank
Yufei Jiang13222.37
Hanjun Duan220.71
Xu Zhu337147.63
Zhongxiang Wei4233.71
Tong Wang5286.83
Fu-Chun Zheng652268.29
Sumei Sun71276144.61