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New radio beam-based access to unlicensed spectrum: design challenges and solutions

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Lagén, Sandra
Giupponi, Lorenza
Goyal, S.
Patriciello, Natale
Bojovic, BiljanaMés informacióMés informació
Demir, A.
Beluri, M.
Document typeArticle
Defense date2019-10-24
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
ProjectREDES 5G EFICIENTES EN RECURSOS (AEI-TEC2017-88373-R)
Abstract
This paper elaborates on the design challenges, opportunities, and solutions for New Radio-based access to Unlicensed spectrum (NR-U) by taking into account the beam-based transmissions and the worldwide regulatory requirements. NR-U intends to expand the applicability of 5th generation New Radio access technology to support operation in unlicensed bands by adhering to Listen-Before-Talk (LBT) requirements for accessing the channel. LBT was already adopted by different variants of 4th generation Long Term Evolution (LTE) in unlicensed spectrum, i.e., Licensed-Assisted Access and MulteFire, to guarantee fair coexistence among different radio access technologies. In the case of beam-based transmissions, the NR-U coexistence framework is significantly different as compared to LTE in unlicensed spectrum due to the use of directional antennas, which enhance the spatial reuse but also complicate the interference management. In particular, beam-based transmissions are needed in the unlicensed spectrum at millimeter-wave (mmWave) bands, which is an attractive candidate for NR-U due to its large amount of allocated spectrum. As a consequence, some major design principles need to be revisited to address coexistence for beam-based NR-U. In this paper, different problems and the potential solutions related to channel access procedures, frame structure, initial access procedures, re-transmission procedures, and scheduling schemes are discussed. A simulation evaluation of different LBT-based channel access procedures for NR-U/Wi-Fi indoor mmWave coexistence scenarios is also provided.
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© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
CitationLagén, S. [et al.]. New radio beam-based access to unlicensed spectrum: design challenges and solutions. "IEEE communications surveys & tutorials", 24 Octubre 2019, vol. 22, núm. 1, p. 8-37. 
URIhttp://hdl.handle.net/2117/352870
DOI10.1109/COMST.2019.2949145
ISSN1553-877X
Publisher versionhttps://ieeexplore.ieee.org/document/8882252
Other identifiershttps://arxiv.org/pdf/1809.10443.pdf
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