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

Sathya, Vanlin; Mehrnoush, Morteza; Ghosh, Monisha; Roy, Sumit

doi:10.1109/access.2020.2964210

Cited by 18 publications

(7 citation statements)

References 29 publications

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“…These issues did not happen in NR-U because NR-U uplink traffic goes overa licensed channel. Similar observations of Wi-Fi losing frames that contain important control messages were also reported in other studies (see [37] and references therein).…”

Section: A Indoor Coexistence Over the Unlicensed 5 Ghz Bandsupporting

confidence: 89%

5G New Radio Unlicensed: Challenges and Evaluation

Hirzallah

Krunz

Kecicioglu

et al. 2021

IEEE Trans. Cogn. Commun. Netw.

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To meet the high demand for mobile data, the Third Generation Partnership Project (3GPP) established a set of standards known as 5G New Radio (5G NR). The architecture of 5G NR includes a flexible radio access network and a core network. 3GPP has also been working on a new radio access technology, called 5G NR Unlicensed (5G NR-U), which aims at extending 5G NR to unlicensed bands. In this paper, we give an overview of the most recent 5G NR-U design elements and discuss potential concerns, including fair coexistence with other unlicensed technologies such as Wi-Fi. We use simulations to study coexistence between Wi-Fi and 5G NR-U systems. Our evaluation indicates that NR-U often achieves higher throughput and lower delay than Wi-Fi (802.11ac). The two systems experience different buffer occupancies and spectrum utilization statistics. We also discuss the improvements that NR-U offers over LTE Licensed Assisted Access (LTE-LAA). I. INTRODUCTION Next-generation wireless networks will support applications with widely diverse performance requirements. In its International Mobile Communications (IMT)-2020 recommendations, the International Telecommunications Union (ITU) specifies three use cases for next-generation wireless networks: Enhanced mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), and massive machine-type communication (mMTC). While these use cases embody different performance requirements, they all share the need for more spectrum. In its effort to extend 5G cellular operation to unlicensed spectrum, 3GPP is initially targeting the Unlicensed National Information Infrastructure (UNII) bands at 5 GHz and 6 GHz. Future specifications will address unlicensed millimeter wave (mmWave) bands at 60 GHz. Wireless systems can operate over unlicensed bands as long as they comply with spectrum regulations, which are intended to ensure harmonious coexistence of various incumbents that operate on the same band. The ubiquity of Wi-Fi networks makes achieving harmonious 5G NR-U and Wi-Fi coexistence a key objective for NR-U designers. To ensure fairness in channel access, NR-U should not impact an existing Wi-Fi system more than the impact of another Wi-Fi system [1]. Early works surveying 5G NR-U can be found in [2]-[5]. These works focused on pre-standard NR-U operation at sub-6 GHz and/or mmWave frequencies and discussed the feasibility of utilizing the channel access procedures of 'further enhanced' LTE LAA (feLAA) in 5G networks. The effectiveness of unlicensed bands for IoT applications was investigated in [6], where the authors studied challenges

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Section: A Indoor Coexistence Over the Unlicensed 5 Ghz Bandsupporting

confidence: 89%

5G New Radio Unlicensed: Challenges and Evaluation

Hirzallah

Krunz

Kecicioglu

et al. 2021

IEEE Trans. Cogn. Commun. Netw.

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“…We demonstrated via an experimental set-up using NI USRPs so that a significant percentage of Wi-Fi beacons will neither be transmitted in a timely fashion nor be received at the LTE-U BS, thus making it difficult for LTE-U BS to adapt its duty cycle in response to the Wi-Fi usage. We proposed a novel Carrier Sense Adaptive Transmission (CSAT) algorithm [50,51,52] to address the problem of Wi-Fi client association in a dense deployment scenario and enable a fair share of spectrum access.…”

Section: Association Issues On Lte-u/wi-fi Coexistencementioning

confidence: 99%

Evolution of Small Cell from 4G to 6G: Past, Present, and Future

Sathya¹

2021

Preprint

Self Cite

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To boost the cellular system's capacity, the operator's have started to reuse the same licensed spectrum by deploying 4G LTE small cells (i.e., Femto Cells) in the past. But in time, these small cell licensed spectrum is not sufficient to satisfy future applications like augmented reality (AR) and virtual reality (VR). Hence, cellular operators look for alternate unlicensed spectrum in Wi-Fi 5 GHz band, later 3GPP named as LTE Licensed Assisted Access (LAA). The recent and current roll-out of LAA deployments (in developed nations like the US) provides an opportunity to understand coexistence's profound ground truth. This paper discusses a high-level overview of my past, present, and future research works in the direction of small cell benefits. In the future, we shift the focus onto the latest unlicensed band: 6 GHz, where the latest Wi-Fi version, 802.11ax, will coexist with the latest cellular technology, 5G New Radio (NR) in unlicensed.

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“…Most wireless technologies use the Sub6 frequency band, resulting in colliding signals in the crammed spectrum, which causes poor performance of the systems that rely on the use of the frequency resources, as seen in [2][3][4], where Wi-Fi and LTE signals coexist on the same frequency range. In order to deal with the situation, the 5G standard proposes using the mmWave spectrum, which is used mainly for satellite communications and radar systems and is not as overloaded as the Sub6 bands.…”

Section: Sub6 -Mmwavementioning

confidence: 99%

Design of 5G-oriented patch antennas, a comprehensive survey

Mongi¹,

Giacri²,

Tardivo³

et al. 2021

ICST Transactions on Mobile Communications and Applications

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With the advent of 5G, higher speeds, more connected users and lower latency are required. To accomplish such goals, new antennas compatible with 5G technology are necessary. Patch antennas, being made of resistant and cheap materials, easy to mass-produce and low profile, represent a solid candidate for deployment in a 5G scenario. This paper aims to serve as a comprehensive guide for designing an antenna using microstrip technology, oriented to provide 5G services. This paper proposes a top-down approach, explaining first the general concepts and orienting the study towards more specific subjects. The topics discussed are the underlying technologies of 5G, patch antennas, circular polarization and array theory. Each topic provides an explanation of its fundamental principles, with an approach intended to be comprehensive instead of technical, and focusing towards giving practical design considerations for a 5G-oriented antenna.

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

Cited by 18 publications

References 29 publications

5G New Radio Unlicensed: Challenges and Evaluation

5G New Radio Unlicensed: Challenges and Evaluation

Evolution of Small Cell from 4G to 6G: Past, Present, and Future

Design of 5G-oriented patch antennas, a comprehensive survey

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