Performance Evaluation of Full-Duplex IAB Multi-Cell and Multi-User Network for FR2 Band

Abstract

One of the approaches to support high data rates in beyond 5G cellular networks is the dense deployment of the small cell millimeter-wave (frequency range 2 (FR2)) (> 24.5 GHz) base stations. However, this dense deployment of base stations leads to high cost, because it requires fiber backhaul connection with the core network. One prominent solution is the integrated access and backhaul (IAB) network proposed in 3GPP Release 16, where some portion of wireless spectrum is used for backhaul to serve base stations instead of fiber, and the remaining portion of the spectrum is used for user equipment for communication. The partition of the spectrum into access and backhaul degrades the spectral efficiency of the IAB network. Thus, in this paper, we propose a full duplex (FD) enabled IAB network with large-scale array systems to enhance the spectral efficiency of the IAB network. In the FD IAB network, the IAB node is FD which transmits and receives at the same frequency/time resources. We consider a multi-cell multiuser IAB network with all the interferences due to FD transmission and evaluate the performance in terms of bit-error-rate and spectral efficiency. Moreover, an algorithm for choosing different users is proposed which is based on the cross-correlation of RF precoder weights. Further, identification of the optimal beam's index is also proposed which is based on the index of synchronization signal block and half-frame bit of physical broadcast channel payload of 5G NR. Finally, successive interference cancellation is proposed for self-interference mitigation in the digital domain.INDEX TERMS Full-duplex, FR2, IAB network, RF precoder, 5G NR.

ZF Precoding-Based Spatial Domain SIC Method for MIMO Full Duplex Systems: A Performance Analysis Under CSI Errors

“…We consider that the target deploys 8 elementary antennas with a transmission power of 0.1W. The FD transceiver's working frequency is set at 28GHz with a bandwidth of 400MHz, which is a typical 5G NR working condition as in [14].…”

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

“…Similar to beam management [29], [30], in this work, the best RF precoder and combiner are selected from the same codebook Y, which can maximize the receive power of Y k [n] among all subcarriers, that is arg max…”

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

“…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.…”