LTE with listen-before-talk in unlicensed spectrum

Jeon, Jeongho; Niu, Huaning; Li, Qian; Papathanassiou, Apostolos; Wu, Geng

doi:10.1109/iccw.2015.7247527

Cited by 61 publications

(19 citation statements)

References 5 publications

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“…duty cycle. For LBT, we identify the key [25]; CW=2, 4 [28]; CW=32, 128 [18], [29]; CW=2 subframes [30]; CW fixed, but optimized for total throughput maximization [31] adaptive CW ETSI LBE option A or 802.11 with binary exponential random backoff [10], [25]; adaptive CW for QoS fairness [32] CS threshold fixed -60 dBm for 20 MHz channels [25]; -62, -68, -72, -77, -82 dBm [10]; -52, -62, -72, -82, -92 dBm [29] adaptive -80 to -30 dBm to guarantee fair coexistence with Wi-Fi and exploit frequency reuse for LAA [33] Channel selection random 12 channels [34]; 3 channels [35]; 11 outdoor and 19 indoor channels [14] distributed avoid other transmissions [10], [11], [21]; least interfered at AP or user [34]; CSAT [19]; avoid Wi-Fi only [14]; Q-learning [36] centralized graph coloring [35];…”

Section: A Proposed Framework For Coexistence Evaluation In a Spectrmentioning

confidence: 99%

Inter-Technology Coexistence in a Spectrum Commons: A Case Study of Wi-Fi and LTE in the 5-GHz Unlicensed Band

Voicu

Simić

Petrova

2016

IEEE J. Select. Areas Commun.

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Abstract-Spectrum sharing mechanisms need to be carefully designed to enable inter-technology coexistence in the unlicensed bands, as these bands are an instance of a spectrum commons where highly heterogeneous technologies and deployments must coexist. Unlike in licensed bands, where multiple technologies could coexist only in a primary-secondary DSA mode, a spectrum commons offers competition opportunities between multiple dominant technologies, such as Wi-Fi and the recently proposed LTE in the 5 GHz unlicensed band. In this paper we systematically study the performance of different spectrum sharing schemes for inter-technology coexistence in a spectrum commons. Our contributions are threefold. Firstly, we propose a general framework for transparent comparative analysis of spectrum sharing mechanisms in time and frequency, by studying the effect of key constituent parameters. Secondly, we propose a novel throughput and interference model for inter-technology coexistence, integrating per-device specifics of different distributed MAC sharing mechanisms in a unified network-level perspective. Finally, we present a case study of IEEE 802.11n Wi-Fi and LTE in the 5 GHz unlicensed band, in order to obtain generalizable insight into coexistence in a spectrum commons. Our extensive Monte Carlo simulation results show that LTE/Wi-Fi coexistence in the 5 GHz band can be ensured simply through channel selection schemes, such that time-sharing MAC mechanisms are irrelevant. We also show that, in the general co-channel case, the coexistence performance of MAC sharing mechanisms strongly depends on the interference coupling in the network, predominantly determined by building shielding. We thus identify two regimes: (i) low interference coupling, e.g. residential indoor scenarios, where duty cycle mechanisms outperform sensing-based listen-before-talk (LBT) mechanisms; and (ii) high interference coupling, e.g. open-plan indoor or outdoor hotspot scenarios, where LBT outperforms duty cycle mechanisms.

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Section: A Proposed Framework For Coexistence Evaluation In a Spectrmentioning

confidence: 99%

Inter-Technology Coexistence in a Spectrum Commons: A Case Study of Wi-Fi and LTE in the 5-GHz Unlicensed Band

Voicu

Simić

Petrova

2016

IEEE J. Select. Areas Commun.

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“…In [16] standardization progress and the survey of the LAA can be found. Preliminary LAA designs and coexistence evaluations are presented in [17,18]. In [19] Markov-chain-based analysis of LTE-WiFi coexistence with simplified LBT and no random backoff is given.…”

Section: Introductionmentioning

confidence: 99%

Wireless Networks Coexistence in Unlicensed Bands

Nikolić

Tošić

Milošević

et al. 2017

IJEEC

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-Mobile communication networks are constantly evolving, and each new generation provides considerably higher data transmission capabilities. Having in mind predictions of high cellular data traffic growth over the next few years, it is clear that the licensed band communications would have problems to support such a high bandwidth demand. One of the possible solutions to this problem is to adaptively use some additional spectrum out of the dedicated licensed band, such as the unlicensed bands. LTE-A standard introduced a new mechanism, named Carrier Aggregation, which provides the possibility to simultaneously use multiple frequency bands, such as the licensed and unlicensed bands. In order to work in an unlicensed band, LTE has to employ some new procedures that provide shared access with other systems using the same frequency band, such as WiFi. These procedures include spectrum sensing, dynamic frequency selection, as well as the coordination of the shared access. Performance measurements and the analysis of the procedures in 5 GHz frequency band will be shown in this paper. Since there is no available LTE hardware operating in 5 GHz band, it has to be made in a laboratory using the software radio approach. The description of such an experiment may be complex, and therefore we describe and propose the concept of the automatic experiment code generation. The automatic code generation is based on the semantic descriptions of experiments, and it is flexible due to the adoption of the domain and system ontologies for formal representation of the semantics of the problem.

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“…Prior to the LAA initiative, the coexistence of LBT-based LTE and WiFi was not evaluated in detail, with most works featuring semi-static coexistence mechanisms such as LTE almost blank subframes or time-division duplexing [4][5][6][7][8]. Preliminary LAA designs and coexistence evaluations corresponding to the 3GPP LAA Study Item phase were presented in [9,10], while a Markov-chain-based analysis of LTE-WiFi coexistence with simplifi ed LBT and no random backoff was performed in [11].…”

Section: Introductionmentioning

confidence: 99%