Fair co-existence of Licensed Assisted Access LTE (LAA-LTE) and Wi-Fi in unlicensed spectrum

Kwan, R.; Pazhyannur, Rajesh; Seymour, James P.; Chandrasekhar, Vikram; Saunders, S.R.; Bevan, D.D.N.; osman, hana abdamonem; Bradford, Julie; Robson, J.G.; Κωνσταντίνου, Κωνσταντίνος

doi:10.1109/ceec.2015.7332692

Cited by 32 publications

(25 citation statements)

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“…In Figure 3 we present this possibility under low-buffer condition, the Wi-Fi performances are almost the same when it coexists with LAA network or another Wi-Fi operator. This result coincides with [27]. In the next phase of this paper we evaluate the performances of LAA/Wi-Fi and LAA/LAA coexistence scenarios under full-buffer situation.…”

Section: Performance Resultssupporting

confidence: 55%

LBT Enhancement for LTE-LAA Fair Coexistence

Mbengue¹,

Chang

2017

IJFGCN

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Section: Performance Resultssupporting

confidence: 55%

LBT Enhancement for LTE-LAA Fair Coexistence

Mbengue¹,

Chang

2017

IJFGCN

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“…where P l is the collision probability of LTE-LAA nodes, W 0 is the minimum contention window size of LTE-LAA, W i = 2 i W 0 is the contention window size at retransmission stage i, and i = m is the maximum retransmission stage (i.e., i = j for j ≤ m and i = m for j > m ). The first equation in (7) represents the transition probability of backoff decrements; the second represents the transition probability after successful transmission and selecting a random back-off at stage 0 for the contending for the next transmission; the third represents the transition probability after unsuccessful transmission in which the contention window size (W i ) is doubled; the last equation represents the transition probability after unsuccessful transmission in (m + e l )th stage in which the next random back-off values reset to the minimum contention window size (W 0 ).…”

Section: Markov Chain Model Of Lte-laa Lbt Is Illustrated Inmentioning

confidence: 99%

“…LTE-U employs an (adaptive) duty-cycle based approach -denoted as Carrier Sense Adaptive Transmission (CSAT) -to adapt the ON and OFF durations for LTE channel access [4]. Specifically, 3GPP has sought to achieve a notion of 'fair coexistence' [5], [7] whereby "LAA design should target fair coexistence with existing Wi-Fi networks to not impact Wi-Fi services more than an additional Wi-Fi network on the same carrier, with respect to throughput and latency".…”

Section: Introductionmentioning

confidence: 99%

Analytical Modeling of Wi-Fi and LTE-LAA Coexistence: Throughput and Impact of Energy Detection Threshold

Mehrnoush

Sathya

Roy

et al. 2018

IEEE/ACM Trans. Networking

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With both small-cell LTE and Wi-Fi networks available as alternatives for deployment in unlicensed bands (notably 5 GHz), the investigation into their coexistence is a topic of active interest, primarily driven by industry groups. 3GPP has recently standardized LTE Licensed Assisted Access (LTE-LAA) that seeks to make LTE more co-existence friendly with Wi-Fi by incorporating similar sensing and back-off features. Nonetheless, the results presented by industry groups offer little consensus on important issues like respective network parameter settings that promote "fair access" as required by 3GPP. Answers to such key system deployment aspects, in turn, require credible analytical models, on which there has been little progress to date. Accordingly, in one of the first work of its kind, we develop a new framework for estimating the throughput of Wi-Fi and LTE-LAA in coexistence scenarios via suitable modifications to the celebrated Bianchi [1] model. The impact of various network parameters such as energy detection (ED) threshold on Wi-Fi and LTE-LAA coexistence is explored as a byproduct and corroborated via a National Instrument (NI) experimental testbed that validates the results for LTE-LAA access priority class 1 and 3.Index Terms-Wi-Fi, LTE-LAA, 5GHz Unlicensed band Coexistence.

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“…In [14], [15], the fairness of Wi-Fi and LTE-LAA, as well as Wi-Fi and LTE-U with CSAT, was investigated; it was shown that when optimally configured, proportionally-fair deployments involving LTE-LAA and LTE-U are capable of providing the same level of fairness to Wi-Fi. In [16], fairness in the coexistence of Wi-Fi/LTE-LAA based on the 3GPP criterion is investigated through an event-based system simulator. Simulation results show that the choice of LBT parameters for LTE-LAA is essential in achieving such fairness.…”

Section: B Fair Coexistence Among Dis-similar Networkmentioning

confidence: 99%

On the Fairness of Wi-Fi and LTE-LAA Coexistence

Mehrnoush

Roy

Sathya

et al. 2018

IEEE Trans. Cogn. Commun. Netw.

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With both small-cell LTE and 802.11 networks now available as alternatives for deployment in unlicensed bands at 5 GHz, investigation into their coexistence is a topic of great interest. 3GPP Rel. 14 has standardized LTE licensed assisted access (LAA) that seeks to make LTE more coexistence friendly with Wi-Fi by incorporating listen before talk (LBT). However, the fairness of Wi-Fi and LTE-LAA sharing is a topic that has not been adequately explored. In this work, we first investigate the 3GPP definition of fair coexistence in [1] via new analytical models. By tuning the LTE-LAA parameters, we exemplify scenarios when the 3GPP notion of fairness is achieved and conversely, when not achieved. The formal notions of access and proportional fairness is then considered for these scenarios to compare and contrast with the 3GPP definition.

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Fair co-existence of Licensed Assisted Access LTE (LAA-LTE) and Wi-Fi in unlicensed spectrum

Cited by 32 publications

References 0 publications

LBT Enhancement for LTE-LAA Fair Coexistence

LBT Enhancement for LTE-LAA Fair Coexistence

Analytical Modeling of Wi-Fi and LTE-LAA Coexistence: Throughput and Impact of Energy Detection Threshold

On the Fairness of Wi-Fi and LTE-LAA Coexistence

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