System performance of LTE and IEEE 802.11 coexisting on a shared frequency band

Nihtilä, Timo; Tykhomyrov, Vitaliy; Alanen, Olli; Uusitalo, Mikko A.; Sorri, Antti; Moisio, Martti; Iraji, Sassan; Ratasuk, Rapeepat; Mangalvedhe, Nitin

doi:10.1109/wcnc.2013.6554707

Cited by 141 publications

(70 citation statements)

References 5 publications

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“…Based on this analysis the authors provide LTE LAA Medium Access Control (MAC) designs to deal with coexistence issues with Wi-Fi. Several other studies [12][13][14] evaluate the Wi-Fi performance degradation based on mathematical models and simulations. All studies come to the same conclusion, namely that coexistence mechanisms are required to enable coexistence between co-located LTE and Wi-Fi networks.…”

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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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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“…In [28], the authors proposed the use of LTE uplink power control to improve LTE/WiFi coexistence. References [29] and [30] propose to enable LTE/WiFi coexistence by muting LTE transmission on certain subframes following a pre-determined pattern.…”

Section: Queueing Modelmentioning

confidence: 99%

Licensed and Unlicensed Spectrum Allocation in Heterogeneous Networks

Zhou

Guo

Honig

2017

IEEE Trans. Commun.

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In future networks, an operator may employ a wide range of access points using diverse radio access technologies (RATs) over multiple licensed and unlicensed frequency bands. This paper studies centralized user association and spectrum allocation across many access points in such a heterogeneous network (HetNet). Such centralized control is on a relatively slow timescale to allow information exchange and joint optimization over multiple cells. This is in contrast and complementary to fast timescale distributed scheduling. A queueing model is introduced to capture the lower spectral efficiency, reliability, and additional delays of data transmission over the unlicensed bands due to contention and/or listen-before-talk requirements. Two optimization-based spectrum allocation schemes are proposed along with efficient algorithms for computing the allocations. The proposed solutions are fully aware of traffic loads, network topology, as well as external interference levels in the unlicensed bands. Packetlevel simulation results show that the proposed schemes significantly outperform orthogonal and fullfrequency-reuse allocations under all traffic conditions. Index TermsLong term evolution (LTE), LTE in unlicensed spectrum (LTE-U), multiple radio access technologies, spectrum allocation, user association.

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“…Coexistence mechanisms with Wi-Fi are discussed, while UL performance analysis using simulation scenarios with both random and cluster placement is conducted. The results show that LTE can deliver significant capacity, even if it shares the spectrum with Wi-Fi networks A study that evaluates the performance of LTE and Wi-Fi in a shared frequency band using a simulation scenario is presented in [8]. As shown, LTE has a negative impact on Wi-Fi, especially in the case where many Wi-Fi users try to access the network simultaneously.…”

Section: Related Workmentioning

confidence: 99%

Impact of LTE Operating in Unlicensed Spectrum on Wi-Fi Using Real Equipment

Maglogiannis

Naudts

Willemen

et al. 2016

2016 IEEE Global Communications Conference (GLOBECOM)

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Abstract-The proliferation of mobile devices and the exponential growth of data transmitted over the air pushed the wireless community to find solutions in order to increase network capacity and fully exploit the available spectrum. Recently, 3GPP announced the operation of LTE in the unlicensed spectrum in order to offload the limited and expensive licensed spectrum. Concurrently, leading parties of the wireless community examine standalone operation of LTE in unlicensed spectrum. LTE was initially designed to operate in licensed spectrum and does not use any channel estimation mechanism to determine ongoing transmissions by other co-located networks. This introduces important coexistence challenges in unlicensed spectrum between LTE deployments and the current, well-established technologies, such as IEEE 802.11 (a.k.a. Wi-Fi). In this paper, we discuss the core differences between LTE and Wi-Fi, which lead to significant coexistence issues. We verify and showcase the problem by analyzing the performance degradation of Wi-Fi, when a traditional LTE network is co-located and operates in the same unlicensed frequency without any coexistence mechanism. The experiments are performed using open-source LTE and Wi-Fi implementations on real equipment in a fully controlled wireless environment. We conclude with showing the need for coexistence mechanisms, following the work that is being done within the standardization activities.

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System performance of LTE and IEEE 802.11 coexisting on a shared frequency band

Cited by 141 publications

References 5 publications

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

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

Licensed and Unlicensed Spectrum Allocation in Heterogeneous Networks

Impact of LTE Operating in Unlicensed Spectrum on Wi-Fi Using Real Equipment

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