Resolving 5G NR-U Contention for Gap-Based Channel Access in Shared Sub-7 GHz Bands

Zając, Marek; Szott, Szymon

doi:10.1109/access.2022.3141193

Cited by 8 publications

(3 citation statements)

References 61 publications

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“…Furthermore, we design a set of utility classes which expedites the process of scenario configuration. We follow the operation principles of the NR-U SimPy simulator (https://github.com/marekzajac97/ nru-channel-access, accessed on 24 December 2023), a discrete-event simulator successfully used in studies of NR-U operating in LBE mode [41,42].…”

Section: Simulatormentioning

confidence: 99%

Channel Access in Wireless Smart Grid Networks Operating under ETSI Frame-Based Equipment Rules

Karcz,

Szott

2023

Energies

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Smart grid operators seeking to extend their wireless network capacity can use unlicensed bands. However, devices in these shared bands must follow rules such as Listen Before Talk (LBT), standardized by ETSI. In this paper, we focus on the performance of the frame-based equipment (FBE) version of LBT channel access. We design, implement, and validate a fully functional FBE channel access simulator. Next, we conduct an extensive performance analysis of the FBE variants encountered in the literature, focusing on channel efficiency and fairness in upper-bound and coexistence scenarios. Our study leads to several conclusions about the operation of FBE-based devices, including the need for proper configuration of channel access parameters to ensure fairness and optimal performance. We also observe generally poor coexistence among FBE variants: the highest Jain’s fairness index was only 0.88, with an average normalized channel efficiency of 0.76. Therefore, we identify several open research areas in the field, such as the need for further development of parameter adaptation algorithms, the deployment of an external controller to update channel access parameters, and new FBE designs with better coexistence qualities.

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Section: Simulatormentioning

confidence: 99%

Channel Access in Wireless Smart Grid Networks Operating under ETSI Frame-Based Equipment Rules

Karcz,

Szott

2023

Energies

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“…We assume the former approach as in [51]. This assumption should not impact the results, as one study observed: ''gap placement (either before or after the backoff period) does not play a critical role'' [52].…”

Section: Channel Access Rulesmentioning

confidence: 99%

Using self-deferral to achieve fairness between Wi-Fi and NR-U in downlink and uplink scenarios

Szott

Kosek-Szott

Valvo

et al. 2022

Computer Communications

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“…Among them, references [10], [15]- [17] were for LTE and applied either the MRT/ZF beamforming scheme, the LBT scheme, or a time-domain interference cancellation (TDIC) solution. The works in [18] and [19] demonstrated the actual coexistence of the 5G NR system with the WiFi system. However, both of them implemented the LBT scheme in their prototypes.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of a 5G NR Transmitter With Wi-Fi Coexistence by Beamforming and Power Control

Liu,

Ku,

Chiueh

2024

IEEE Open J. Commun. Soc.

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Telecom operators are under pressure to provide more spectrum resources to meet the increasing demand for high-throughput mobile communications. To achieve this, they have focused on unlicensed frequency bands, but the coexistence of 5G signals with other communication systems on these bands poses a challenge. To address this, beamforming technology has been introduced to reduce interference in space and enable independent demodulation of 5G and Wi-Fi signals. This paper implements a 5G base station (BS) prototype with an eight-antenna beamforming hardware transmitter, which concentrates the transmitted energy on individual 5G receivers while reducing the signal's impact on Wi-Fi receivers. Angle of arrival estimation and power control mechanisms are also integrated to enhance the efficiency of the solution. To verify the system coexistence, software-defined radio is used to realize 5G and Wi-Fi receivers. The proposed solution is demonstrated via over-the-air experiments to perform reliable transmission to multiple 5G receivers without interrupting Wi-Fi traffic on the same frequency band. The beamformer can also adjust its spatial profile and power level through environment-sensing functions built into the BS prototype. The proposed power control method delivers improved 5G transmitter and Wi-Fi transmitter energy performance by 50% and 51%, respectively.

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Resolving 5G NR-U Contention for Gap-Based Channel Access in Shared Sub-7 GHz Bands

Cited by 8 publications

References 61 publications

Channel Access in Wireless Smart Grid Networks Operating under ETSI Frame-Based Equipment Rules

Channel Access in Wireless Smart Grid Networks Operating under ETSI Frame-Based Equipment Rules

Using self-deferral to achieve fairness between Wi-Fi and NR-U in downlink and uplink scenarios

Design and Implementation of a 5G NR Transmitter With Wi-Fi Coexistence by Beamforming and Power Control

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