Medium access design for LTE in unlicensed band

Bhorkar, Abhijeet; Ibars, Christian; Papathanassiou, Apostolos; Zong, Pingping

doi:10.1109/wcncw.2015.7122583

Cited by 39 publications

(28 citation statements)

References 3 publications

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“…Wi-Fi/LBT-LTE [129], [142]- [144] Wi-Fi: CSMA/CA; LTE: generic LBT -different ED thresholds [142], ideal MAC and different channel selection schemes (random, least interfered) [129], ETSI LBE [143] optimized topologies [144] distributed [129], [142], [143], likely centralized [144] [135], [145]- [147] Wi-Fi: CSMA/CA; LTE: LBT without random backoff - [135] two time granularity levels; [145] ETSI FBE; adaptive transmission duration [146]; dynamic channel switch [146] distributed [135], [145], [147], centralized [146] [124], [126], [132], [136], [147]- [151] Wi-Fi: CSMA/CA; LTE: LBT with random backoff within fixed interval (or fixed CW) -different ED thresholds [132], [136], adaptive ED threshold [150], variable transmission duration [148], different channel selection schemes (random, least power at AP or UE) [136] distributed [123], [133], [151]- [158] Wi-Fi: CSMA/CA; LTE: LBT with binary exponential random backoff -backoff freeze [154], ETSI LBE [151], different ED thresholds [154], different channel selection [133], [155]-…”

Section: B Coexistence Among Broadband Technologiesmentioning

confidence: 99%

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Survey of Spectrum Sharing for Inter-Technology Coexistence

Voicu

Simić

Petrova

2019

IEEE Commun. Surv. Tutorials

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Increasing capacity demands in emerging wireless technologies are expected to be met by network densification and spectrum bands open to multiple technologies. These will, in turn, increase the level of interference and also result in more complex inter-technology interactions, which will need to be managed through spectrum sharing mechanisms. Consequently, novel spectrum sharing mechanisms should be designed to allow spectrum access for multiple technologies, while efficiently utilizing the spectrum resources overall. Importantly, it is not trivial to design such efficient mechanisms, not only due to technical aspects, but also due to regulatory and business model constraints. In this survey we address spectrum sharing mechanisms for wireless inter-technology coexistence by means of a technology circle that incorporates in a unified, system-level view the technical and nontechnical aspects. We thus systematically explore the spectrum sharing design space consisting of parameters at different layers. Using this framework, we present a literature review on intertechnology coexistence with a focus on wireless technologies with equal spectrum access rights, i.e. (i) primary/primary, (ii) secondary/secondary, and (iii) technologies operating in a spectrum commons. Moreover, we reflect on our literature review to identify possible spectrum sharing design solutions and performance evaluation approaches useful for future coexistence cases. Finally, we discuss spectrum sharing design challenges and suggest future research directions.

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Section: B Coexistence Among Broadband Technologiesmentioning

confidence: 99%

“…−vs. coexistence with itself [123], [130], [132], [133], [136] Impact of coexistence on unmodified LTE −no baseline [121], [126], [130],…”

Section: -30 Stations Of Each Technologymentioning

confidence: 99%

Survey of Spectrum Sharing for Inter-Technology Coexistence

Voicu

Simić

Petrova

2019

IEEE Commun. Surv. Tutorials

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“…In [24], a MAC layer for LTE-U is proposed that uses an LBT algorithm and channel reservation packets. Both synchronous and asynchronous LBT are examined.…”

Section: Related Workmentioning

confidence: 99%

An adaptive LTE listen-before-talk scheme towards a fair coexistence with Wi-Fi in unlicensed spectrum

et al. 2018

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The technological growth combined with the exponential increase of wireless traffic are pushing the wireless community to investigate solutions to maximally exploit the available spectrum. Among the proposed solutions, the operation of Long Term Evolution (LTE) in the unlicensed spectrum (LTE-U) has attracted significant attention. Recently, the 3rd Generation Partnership Project announced specifications that allow LTE to transmit in the unlicensed spectrum using a Listen Before Talk (LBT) procedure, respecting this way the regulator requirements worldwide. However, the proposed standards may cause coexistence issues between LTE and legacy Wi-Fi networks. In this article, it is discussed that a fair coexistence mechanism is needed to guarantee equal channel access opportunities for the co-located networks in a technology-agnostic way, taking into account potential traffic requirements. In order to enable harmonious coexistence and fair spectrum sharing among LTE-U and Wi-Fi, an adaptive LTE-U LBT scheme is presented. This scheme uses a variable LTE transmission opportunity (TXOP) followed by a variable muting period. This way, co-located Wi-Fi networks can exploit the muting period to gain access to the wireless medium. The scheme is studied and evaluated in different compelling scenarios using a simulation platform. The results show that by configuring the LTE-U with the appropriate TXOP and muting period values, the proposed scheme can significantly improve the coexistence among LTE-U and Wi-Fi in a fair manner. Finally, a preliminary algorithm is proposed on how the optimal configuration parameters can be selected towards harmonious and fair coexistence.

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“…Multiple studies analysing different outdoor and indoor scenarios, and various coexistence methods have been performed [6], [10], [11]. Most of them consider the coexistence as a medium access problem, and analyse the performance by the means of the Markov chain analysis, typical for contention-based access [12]- [14].…”

Section: B Related Workmentioning

confidence: 99%

On Random Access Channel Performance and M2M Support in Standalone LTE Unlicensed

Schrader¹,

Vilgelm

Kellerer

2017

GLOBECOM 2017 - 2017 IEEE Global Communications Conference

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Abstract-Next generation telecommunication systems are required to efficiently support orders of magnitude larger amount of devices per cell than the current LTE networks. This requirement is causing major design challenges for the Random Access Channel (RACH), especially for Machine-to-Machine (M2M) applications. On the other hand, due to the increasing spectrum demands, LTE vendors are exploring unlicensed spectrum. For example, MulteFire has been recently standardized as an LTEbased technology for standalone deployment in unlicensed 5GHz frequency bands. It is reasonable to expect that the coexistence with Wi-Fi and standalone LTE in the unlicensed spectrum, will amplify Random Access problem and worsen RACH performance. Henceforth, in this paper, we quantify the Wi-Fi-LTE coexistence and its impact on the RACH performance. We consider a synchronized activation of a large amount of UEs in an MulteFire/LTE unlicensed cell, and analyze the time it takes to connect all of them to the base station. Our results confirm that the presence of Wi-Fi substantially degrades RACH performance, with an increase of almost 50% per additional Wi-Fi station. Furthermore, we illustrate applications of our evaluation for RACH resource dimensioning and network planning.

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Medium access design for LTE in unlicensed band

Cited by 39 publications

References 3 publications

Survey of Spectrum Sharing for Inter-Technology Coexistence

Survey of Spectrum Sharing for Inter-Technology Coexistence

An adaptive LTE listen-before-talk scheme towards a fair coexistence with Wi-Fi in unlicensed spectrum

On Random Access Channel Performance and M2M Support in Standalone LTE Unlicensed

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