Licensed-Assisted Access to Unlicensed Spectrum in LTE Release 13

Kwon, Hyukjoon; Jeon, Jeongho; Bhorkar, Abhijeet; Ye, Qiaoyang; Harada, Hiroyuki; Jiang, Ying; Liu, Ming; Nagata, Satoshi; Ng, Boon Loong; Novlan, Thomas; Oh, Jae Eung; Wang, Yi

doi:10.1109/mcom.2016.1500698cm

Cited by 101 publications

(62 citation statements)

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“…For instance, a higher correlation requires a higher number of potential relays [19]. Furthermore, LTE Release 13 specifies a licensed-assisted access (LAA) operation mode, that includes a listen-before-talk channel sensing mechanism to support coexistence with WiFi in the unlicensed spectrum (see [20], [21]). LAA is also perceived to be a key feature of 5G networks [22].…”

Section: B Contributionsmentioning

confidence: 99%

On Interference Dynamics in Matérn Networks

Schilcher

Schmidt

Bettstetter

2020

IEEE Trans. on Mobile Comput.

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A thorough understanding of the temporal dynamics of interference in wireless networks is crucial for the design of communication protocols, scheduling, and interference management. This paper applies stochastic geometry to investigate interference dynamics for the first time in a network with nodes that use carrier sense multiple access. This type of networks is approximated by a Matérn hard-core point process of type II with Nakagami fading. We derive and analyze expressions for the variance, covariance, and correlation of the interference power at a given point in space. Results show that even though the commonly used Poisson approximation to carrier sense multiple access may have the same average interference than the Matérn model, the three interference dynamics measurements investigated behave significantly different.

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Section: B Contributionsmentioning

confidence: 99%

On Interference Dynamics in Matérn Networks

Schilcher

Schmidt

Bettstetter

2020

IEEE Trans. on Mobile Comput.

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“…Once sensing tasks are sent to BSs, each one measures the received energy in its assigned channels. For instance, in a MulteFire system, several CCA slots are used, where in each one, an energy measurement is compared to a detection threshold [18]. One major issue that can arise in such system is that raw energy estimates can considerably fluctuate over different CCA windows because of fading, shadowing, or blockage.…”

Section: Diffusion-based Distributed Sensingmentioning

confidence: 99%

Distributed Wideband Sensing-Based Architecture for Unlicensed Massive IoT Communications

Hattab

Čabrić

2019

IEEE Trans. Cogn. Commun. Netw.

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Providing Internet connectivity to a massive number of Internet-of-things (IoT) objects over the unlicensed spectrum requires: (i) identifying a very large number of narrowband channels in a wideband spectrum and (ii) aggressively reusing the available channels over space to accommodate the high density of IoT devices. To this end, we propose a sensing-based architecture that identifies spectral and spatial resources at a fine resolution. In particular, we first propose a sensing assignment scheduler, where each base station (BS) is assigned a subset of the spectrum to sense at a high resolution. We then propose a distributed sensing algorithm, where BSs locally process and share their sensing reports, so that each BS obtains occupancy information of the wideband spectrum at its location. Once the spatio-spectral resource blocks are identified, we further propose a distributed resource allocation algorithm that maintains high spatial reuse of spectral opportunities while limiting the intra-network and inter-network interference. Numerical simulations are presented to validate the effectiveness of the proposed distributed algorithms, comparing them to centralized and non-cooperative schemes. It is shown that our architecture identifies more spatiospectral resources, with lower misdetection of incumbents. As a result, more IoT devices are connected with limited interference into incumbents.

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“…In [17], the authors provide a description of the LTE LAA mechanisms including motivation and use cases to which it can be applied. They present a coexistence evaluation methodology and results, which have been contributed by 3GPP.…”

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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Licensed-Assisted Access to Unlicensed Spectrum in LTE Release 13

Cited by 101 publications

References 0 publications

On Interference Dynamics in Matérn Networks

On Interference Dynamics in Matérn Networks

Distributed Wideband Sensing-Based Architecture for Unlicensed Massive IoT Communications

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

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