Sub-Band Full-Duplex for 5G New Radio: Challenges, Solutions and Performance

Recently, multiple works in the literature have presented encouraging results on the feasibility of in-band full-duplex (IBFD) communications in point-to-point and single cell arrangements, where the IBFD capability is provided by the base station. However, in multi-cell networks, in addition to hig...

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Published in:Conference record - Asilomar Conference on Signals, Systems, & Computers pp. 167 - 173
Main Authors: Giupponi, Lorenza, Fodor, Gabor, Ambede, Abhishek, Hui, Dennis, Goransson, Bo, Barros Da Silva, Jose Mairton
Format: Conference Proceeding
Language:English
Published: IEEE 29.10.2023
Subjects:
Base stations
Computers
cross-link interference
Downlink
Faces
Frequency conversion
Full-duplex system
Interference cancellation
multiple antenna systems
New Radio
self-interference cancellation
sub-band full-duplex
Time-frequency analysis
Uplink
ISSN:2576-2303
Online Access:Get full text
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Abstract Recently, multiple works in the literature have presented encouraging results on the feasibility of in-band full-duplex (IBFD) communications in point-to-point and single cell arrangements, where the IBFD capability is provided by the base station. However, in multi-cell networks, in addition to high self-interference, full-duplex operations also face the severe problems of base station-to-base station cross-link interference (CLI), inter-sector CLI, user equipment-to-user equipment CLI, and inter-operator interference. Due to these difficulties, the research and engineering communities have recently proposed to adopt sub-band full-duplex (SBFD), as an intermediary step towards IBFD in the evolution of 5G New Radio systems. With SBFD, cellular base stations may operate the downlink and uplink on different non-overlapping frequency sub-bands within a time division duplexing carrier, which helps reduce self-interference and CLI due to the frequency isolation between the uplink and downlink sub-bands. In this paper, we focus on Frequency Range 1 operation, investigate the novel SBFD concept, and compare it to traditional time division duplexing, using realistic assumptions on multi-cell deployments, adjacent channel leakage, CLI and self-interference cancellation techniques. Our results indicate that SBFD operation may primarily be a candidate for low power deployments, with complexity and feasibility challenges in scenarios using high base station transmission power, sectorization, and in the presence of multiple operators.
AbstractList Recently, multiple works in the literature have presented encouraging results on the feasibility of in-band full-duplex (IBFD) communications in point-to-point and single cell arrangements, where the IBFD capability is provided by the base station. However, in multi-cell networks, in addition to high self-interference, full-duplex operations also face the severe problems of base station-to-base station cross-link interference (CLI), inter-sector CLI, user equipment-to-user equipment CLI, and inter-operator interference. Due to these difficulties, the research and engineering communities have recently proposed to adopt sub-band full-duplex (SBFD), as an intermediary step towards IBFD in the evolution of 5G New Radio systems. With SBFD, cellular base stations may operate the downlink and uplink on different non-overlapping frequency sub-bands within a time division duplexing carrier, which helps reduce self-interference and CLI due to the frequency isolation between the uplink and downlink sub-bands. In this paper, we focus on Frequency Range 1 operation, investigate the novel SBFD concept, and compare it to traditional time division duplexing, using realistic assumptions on multi-cell deployments, adjacent channel leakage, CLI and self-interference cancellation techniques. Our results indicate that SBFD operation may primarily be a candidate for low power deployments, with complexity and feasibility challenges in scenarios using high base station transmission power, sectorization, and in the presence of multiple operators.
Author Fodor, Gabor
Giupponi, Lorenza
Barros Da Silva, Jose Mairton
Ambede, Abhishek
Hui, Dennis
Goransson, Bo
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  organization: Uppsala University,Uppsala,Sweden
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Snippet Recently, multiple works in the literature have presented encouraging results on the feasibility of in-band full-duplex (IBFD) communications in point-to-point...
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StartPage 167
SubjectTerms Base stations
Computers
cross-link interference
Downlink
Faces
Frequency conversion
Full-duplex system
Interference cancellation
multiple antenna systems
New Radio
self-interference cancellation
sub-band full-duplex
Time-frequency analysis
Uplink
Title Sub-Band Full-Duplex for 5G New Radio: Challenges, Solutions and Performance
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