Design and Analysis of In-Band Full-Duplex Private 5G Networks Using FR2 Band

Abstract

This paper studies a solution for efficient industrial Internet of things (IIoT) communications through a in-band full-duplex (IBFD) enabled private 5G network in frequency range 2 (FR2) band (≥ 24.250 GHz), where ultra-reliable low-latency communications (URLLC) and enhanced mobile broadband (eMBB) devices can be simultaneously served. Large-scale antenna array and RF beamforming are applied, and a self-interference cancellation (SIC) scheme is proposed under such architecture. Particularly, the proposed RF cancellation scheme addressed two key issues of extending current technologies to wideband operations in FR2 band: limited operational bandwidth and the requirement for a large number of cancellers. Then, a frequency domain-based digital canceller is proposed to process with the residual self-interference (RSI) with short processing latency. A game theoretic user allocation algorithm is proposed to minimise cochannel interference (CCI) in a heterogeneous environment. Given a typical IIoT scenario, the performance of such IBFD private 5G network is evaluated in terms of bit-error rate (BER) and spectral efficiency (SE) through simulations and analysed based on numerical results and theoretical calculations. It is demonstrated that the latency of uplink eMBB devices can be reduced by 54% through IBFD radios, and the latency of downlink URLLC devices can be reduced to 0.5 ms with the help of flexible numerology, mini-slot, and self-contained sub-frames introduced in 5G NR. IBFD radios can enhance the SE by 92% compared to HD radios with our SIC and user allocation policy. The high SE in conjunction with abundant resources in FR2 band provide multi-Gbps peak data rates, high reliability, and massive connectivity.

Performance Analysis of In-Band-Full-Duplex Multi-Cell Wideband IAB Networks

“…To further explore the benefits of the mmWave spectrum, in-band-full-duplex (IBFD) transmission, where transmission and reception occur at the same time and frequency band, has been proposed [6], [7]. Compared with half-duplex (HD) transmission, the IBFD scheme provides twice the spectral efficiency (SE) and half the latency [8]. However, dealing with self-interference (SI), which can be more than 100 dB higher than the desired signal, is the biggest challenge in realizing IBFD transmission.…”

“…However, dealing with self-interference (SI), which can be more than 100 dB higher than the desired signal, is the biggest challenge in realizing IBFD transmission. Fortunately, a combination of antenna [9], analog [8], [10], and digital [11] SI cancellation (SIC) can achieve satisfactory performance in mmWave IBFD networks.…”

Design and Analysis of Wideband In-Band-Full- Duplex FR2-IAB Networks

“…To further explore the benefit of the mmWave spectrum, the in-band-full-duplex (IBFD) transmission, where transmission and reception occur at the same time and frequency band, is proposed [5]. Compared with the half-duplex (HD) transmission, the IBFD scheme provides twice the spectral efficiency (SE) and half the latency [6]. However, dealing with the selfinterference (SI), which can be more than 100 dB higher than the desired signal, becomes the biggest challenge in realizing the IBFD transmission.…”

“…However, dealing with the selfinterference (SI), which can be more than 100 dB higher than the desired signal, becomes the biggest challenge in realizing the IBFD transmission. Fortunately, a combination of antenna [7], analog [6], and digital [8] SI cancellation (SIC) can achieve satisfactory performance in mmWave IBFD networks.…”

In-Band-Full-Duplex Integrated Sensing and Communications for IAB Networks

“…However, to ensure the benefits of IBFD transmission, the self-interference (SI), which is more than 100 dB higher than the desired signal [5], needs to be canceled efficiently. Recently, SI cancellation (SIC) techniques in the propagation [6], analog [7], [8], and digital domains [9] have been investigated. Moreover, the results in our recent work [9] show satisfactory performance on SIC with the combination of those three SIC techniques.…”