LTE-unlicensed: the future of spectrum aggregation for cellular networks

Zhang, Ran; Wang, Miao; Cai, Lin X.; Zheng, Zhongming; Shen, Xuemin; Xie, Liang-Liang

doi:10.1109/mwc.2015.7143339

Cited by 340 publications

(230 citation statements)

References 11 publications

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“…Presently, there are mainly three operation modes proposed for LTE-U networking based on different control channel configurations and supplementary links: supplementary downlink (SDL), carrier aggregation (CA) time division LTE (TD-LTE), and standalone LTE-U [3], [4].…”

Section: A Lte-u Operation Modesmentioning

confidence: 99%

Embedding LTE-U within Wi-Fi Bands for Spectrum Efficiency Improvement

Chen

Elmaghraby

et al. 2017

IEEE Network

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Driven by growing spectrum shortage, Long-term Evolution in unlicensed spectrum (LTE-U) has recently been proposed as a new paradigm to deliver better performance and experience for mobile users by extending the LTE protocol to unlicensed spectrum. In the paper, we first present a comprehensive overview of the LTE-U technology, and discuss the practical challenges it faces. We summarize the existing LTE-U operation modes and analyze several means for LTE-U coexistence with Wi-Fi medium access control protocols. We further propose a novel hyper access-point (HAP) that integrates the functionalities of LTE small cell base station and commercial Wi-Fi AP for deployment by cellular network operators. Our proposed LTE-U access embedding within the Wi-Fi protocol is non-disruptive to unlicensed Wi-Fi nodes and demonstrates performance benefits as a seamless and novel LTE and Wi-Fi coexistence technology in unlicensed band. We provide results to demonstrate the performances advantage of this novel LTE-U proposal.

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Section: A Lte-u Operation Modesmentioning

confidence: 99%

Embedding LTE-U within Wi-Fi Bands for Spectrum Efficiency Improvement

Chen

Elmaghraby

et al. 2017

IEEE Network

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“…By utilizing the considerable amount of unlicensed spectrum available around the globe, low power transmissions can avoid cross-tier interference. LTE-U has been included in 3GPP Release 13 standardization along with carrier aggregation [4].…”

Section: A Backgroundmentioning

confidence: 99%

Device-to-device meets LTE-unlicensed

Guo

Yuan

et al. 2016

IEEE Commun. Mag.

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“…The unlicensed spectrum is used only for the high data rate service. In this context, LTE in unlicensed spectrum, referred to as LTE-U, is proposed to enable mobile operators to offload data traffic onto unlicensed frequencies more efficiently and effectively, and provides high performance and seamless user experience [5].…”

Section: Introductionmentioning

confidence: 99%

Self-Organized Beam Scheduling as an Enabler for Coexistence in 5G Unlicensed Bands

Nekovee

Wang

2017

IEICE Trans. Commun.

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SUMMARYIn order to support user data rates of Gbps and above in the fifth generation (5G) communication systems, millimeter wave (mm-wave) communication is proposed as one of the most important enabling technologies. In this paper, we consider the spectrum bands shared by 5G cellular base stations (BS) and some existing networks, such as WiGig and proposed a method for spectrally efficient coexistence of multiple interfering BSs through adaptive self-organized beam scheduling. These BSs might use multiple radio access technologies belonging to multiple operators and are deployed in the unlicensed bands, such as 60 GHz. Different from the recently emerging coexistence scenarios in the unlicensed 5 GHz band, where the proposed methods are based on omni-directional transmission, beamforming needs to be employed in mm-wave bands to combat the high path loss problem. The proposed method is concerned with this new scenario of communication in the unlicensed bands where (a) beam-forming is mandatory to combat severe path loss, (b) without optimal scheduling of beams mutual interference could be severe due to the possibility of beam-collisions, (c) unlike LTE which users time-frequency resource blocks, a new resource, i.e., the beam direction, is used as mandatory feature. We propose in this paper a novel multi-RAT coexistence mechanism where neighbouring 5G BSs, each serving their own associated users, schedule their beam configurations in a self-organized manner such that their own utility function, e.g. spectral efficiency, is maximized. The problem is formulated as a combinatorial optimization problem and it is shown via simulations that our proposed distributed algorithms yield a comparable spectral efficiency for the entire networks as that using an exhaustive search, which requires global coordination among coexisting RATs and also has a much higher algorithmic complexity. key words: millimeter-wave, 5G, licensed and unlicensed bands, coexistence, spectrum sharing

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LTE-unlicensed: the future of spectrum aggregation for cellular networks

Cited by 340 publications

References 11 publications

Embedding LTE-U within Wi-Fi Bands for Spectrum Efficiency Improvement

Embedding LTE-U within Wi-Fi Bands for Spectrum Efficiency Improvement

Device-to-device meets LTE-unlicensed

Self-Organized Beam Scheduling as an Enabler for Coexistence in 5G Unlicensed Bands

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