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Toward URLLC: A Full Duplex Relay System with Self-Interference Utilization or Cancellation
IEEE Wireless Communications ( IF 10.9 ) Pub Date : 2021-01-05 , DOI: 10.1109/mwc.001.2000238
Yufei Jiang , Hanjun Duan , Xu Zhu , Zhongxiang Wei , Tong Wang , Fu-Chun Zheng , Sumei Sun

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.

中文翻译:

转向URLLC:具有自干扰利用或抵消功能的全双工中继系统

超可靠的低延迟通信(URLLC)是5G无线通信的关键用例之一,可满足具有严格延迟和可靠性要求的特定应用场景,例如工业自动化和触觉互联网。在相同频带中同时发送和接收的全双工(FD)中继是一种有效的方法,可通过显着抑制自干扰(SI)来增强小区边缘用户终端的可靠性。然而,由于SI消除而导致的FD中继处的信号处理等待时间,称为中继等待时间,在端到端等待时间中占很大一部分,因此应在确保高可靠性的同时将其最小化。在本文中,我们首先介绍FD中继系统的端到端延迟的最新概述,以应对物理层的挑战。我们研究文献中可能的解决方案,以实现URLLC的目标。有效的解决方案是允许具有低复杂度SI射频和模拟消除的简单的放大和转发FD中继模式,并以自适应方式在基站处与所需信号一起处理残留SI,而不是在基站处消除残余SI。在数字领域进行中继。另外,可以在基站处利用残余SI来增强信号处理中的可靠性和自由度,而不必尽可能地消除。与现有概述工作相比,具有自适应SI利用或消除功能的FD中继辅助系统可扩展网络覆盖范围,增强可靠性并减少延迟。有效的解决方案是允许具有低复杂度SI射频和模拟对消的简单放大转发FD中继模式,并以自适应方式在基站处与所需信号一起处理残留SI,而不是在基站处被消除。在数字领域进行中继。另外,可以在基站处利用残余SI来增强信号处理中的可靠性和自由度,而不必尽可能地消除。与现有概述工作相比,具有自适应SI利用或消除功能的FD中继辅助系统可扩展网络覆盖范围,增强可靠性并减少延迟。有效的解决方案是允许具有低复杂度SI射频和模拟消除的简单的放大和转发FD中继模式,并以自适应方式在基站处与所需信号一起处理残留SI,而不是在基站处消除残余SI。在数字领域进行中继。另外,可以在基站处利用残余SI来增强信号处理中的可靠性和自由度,而不必尽可能地消除。与现有概述工作相比,具有自适应SI利用或消除功能的FD中继辅助系统可扩展网络覆盖范围,增强可靠性并减少延迟。并以自适应方式在基站处与所需信号一起处理残余SI,而不是在数字域中的中继处将其消除。另外,可以在基站处利用残余SI来增强信号处理中的可靠性和自由度,而不必尽可能地消除。与现有概述工作相比,具有自适应SI利用或消除功能的FD中继辅助系统可扩展网络覆盖范围,增强可靠性并减少延迟。并且以自适应的方式在基站处与期望信号一起处理残余SI,而不是在数字域中的中继站处将其消除。另外,可以在基站处利用残余SI来增强信号处理中的可靠性和自由度,而不必尽可能地消除。与现有概述工作相比,具有自适应SI利用或消除功能的FD中继辅助系统可扩展网络覆盖范围,增强可靠性并减少延迟。
更新日期:2021-02-26
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