Harmonious Cross-Technology Coexistence With Heterogeneous Traffic in Unlicensed Bands: Analysis and Approximations

Hirzallah, Mohammed; Krunz, Marwan; Xiao, Yong

doi:10.1109/tccn.2019.2934108

Cited by 26 publications

(20 citation statements)

References 24 publications

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“…Listen Before Talk (LBT). Due to the LBT scheme [6]- [9], LTE LAA become most successful for cellular operation over unlicensed spectrum. In this work, we focus on the realtime aspect of duty cycle based LTE-U CSAT when cellular operator try to coexist with the Wi-Fi.…”

Section: Introductionmentioning

confidence: 99%

Wi-Fi/LTE-U Coexistence: Real-Time Issues and Solutions

et al. 2020

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Coexistence of small-cell LTE-U and Wi-Fi networks in unlicensed bands at 5 GHz is a topic of active interest, primarily driven by industry groups affiliated with the two (cellular and Wi-Fi) segments. Our focus in this work is on real-time deployment aspects of such coexisting networks, a topic which has seen little traction in the existing literature. The aim is to explore the following questions: (1) How do Wi-Fi clients associate with a Wi-Fi access point (AP) when a LTE-U base station is active with its maximum duty cycle, (2) How is the latency of Wi-Fi connection affected (in terms of association and data transmission) during coexistence with LTE-U, and (3) How does the energy sensing threshold of Wi-Fi affect the latency and throughput performance of Wi-Fi and LTE-U?

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Section: Introductionmentioning

confidence: 99%

Wi-Fi/LTE-U Coexistence: Real-Time Issues and Solutions

et al. 2020

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“…Many studies [10], [19], [20] conclude that the operation with default LBT channel access parameters (MCOT, W min , etc.) is unfair to Wi-Fi networks.…”

Section: Related Papersmentioning

confidence: 99%

Enhanced Collision Resolution Methods With Mini-Slot Support for 5G NR-U

et al. 2021

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To improve the capacity of cellular systems without additional expenses on licensed frequency bands, the 3GPP consortium has designed cellular technologies that use the unlicensed spectrum. The important peculiarity of the usage models of these technologies, the latest of which is New Radio Unlicensed (NR-U), is the coexistence with Wi-Fi networks deployed in the same frequency band. That is why NR-U uses channel access methods similar to those of Wi-Fi. However, the performance of Wi-Fi networks notably deteriorates in coexistence scenarios. One of the reasons is the slotted structure of transmissions of cellular base stations in the unlicensed spectrum, which may imply the use of a reservation signal. The paper proposes two novel channel access methods for NR-U, in which an NR-U base station randomly stops sending the reservation signal to listen to the channel to detect and resolve collisions. Analytical models are developed to validate the proposed methods and evaluate their efficiency, taking into account important features of NR-U networks, such as flexible numerology and mini-slot transmissions. The obtained numerical results show that the proposed methods significantly improve the performance of the Wi-Fi or NR-U network without degradation of the throughput of the other technology in coexistence scenarios.

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“…The LBT concept that detects the channel usage before transmitting data was studied in [11][12][13][14]. This scheme can be further categorized into with or without the random backoff mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Otherwise, an Extended CCA (ECCA) with random back-off is performed, where the channel is observed for the duration of a random integer multiplied by the CCA check time. In [12], an efficient framework for fair coexistence between LTE and Wi-Fi systems was proposed. In that framework, each network has multiple priority classes and both networks can optimize the throughput and latency.…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of Time-Domain Interference Cancellation Receiver for LTE-U Systems

Wang

Chiueh

2020

IEEE Access

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Mobile devices nowadays have penetrated our daily life and they play a big role in our social, professional, and recreational activities. In order to satisfy the booming demands for mobile communications from their customers, the telecommunication service provides work very hard to secure more spectrum and construct more base-stations. As such, they have looked into unlicensed spectrum for possible deployment of their mobile services. Toward this end, this paper presents a time-domain interference cancellation (TDIC) receiver technique that can enhance the efficiency of mobile communication networks coexisting with Wi-Fi traffic in the unlicensed bands. Moreover, transmitter power control and novel channel estimation are proposed to optimize the overall throughput of the fourth-generation mobile communication networks operating in the unlicensed bands (LTE-U). We further show by simulation and by over-the-air (OTA) real-time demonstration that the proposed solution indeed can achieve reliable reception of LTE-U signals under Wi-Fi interferences with different power levels.

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Harmonious Cross-Technology Coexistence With Heterogeneous Traffic in Unlicensed Bands: Analysis and Approximations

Cited by 26 publications

References 24 publications

Wi-Fi/LTE-U Coexistence: Real-Time Issues and Solutions

Wi-Fi/LTE-U Coexistence: Real-Time Issues and Solutions

Enhanced Collision Resolution Methods With Mini-Slot Support for 5G NR-U

Design and Implementation of Time-Domain Interference Cancellation Receiver for LTE-U Systems

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