Proceedings ArticleDOI
Performance Analysis of LAA and WiFi Coexistence in Unlicensed Spectrum Based on Markov Chain
Yuan Gao,Xiaoli Chu,Jie Zhang +2 more
- pp 1-6
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TLDR
This paper presents a new framework to evaluate the downlink performance of coexisting LAA and WiFi networks, and shows that throughput of a WiFi network can be enhanced by adding or replacing WiFi access points with LAA E-UTRAN Node Bs, at the expense of different levels of WiFi performance degradation.Abstract:
License-assisted access (LAA) is a candidate feature in 3GPP Rel-13 to meet the explosive growth of traffic demand. The main idea of LAA is to deploy LTE in the unlicensed band (mainly the 5GHz band), which is abundant with available spectrum. However, the major concern is the coexistence between WiFi and LAA in the same band. This paper presents a new framework to evaluate the downlink performance of coexisting LAA and WiFi networks. By using Markov chain, analytical models are established based on WiFi distributed coordination function (DCF) and two listen-before- talk (LBT) schemes. These two LBT schemes are Cat 3 and Cat 4 LBT, which mainly differ in medium access schemes in terms of backoff procedure. Unlike most existing works, which focus on the impact on WiFi performance posed by LAA, the performance of LAA is also evaluated. Our analysis shows that throughput of a WiFi network can be enhanced by adding or replacing WiFi access points (APs) with LAA E-UTRAN Node Bs (eNBs), at the expense of different levels of WiFi performance degradation. A trade-off between WiFi protection and LAA-WiFi system performance enhancement is observed. WiFi throughput and delay are less affected by Cat 4 LBT scheme, while Cat 3 LBT scheme provides higher LAA-WiFi system throughput. The choice of LBT schemes relies on the network planning priority, WiFi performance protection and LAA system performance requirements.read more
Citations
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Journal ArticleDOI
Enabling Technologies for Ultra-Reliable and Low Latency Communications: From PHY and MAC Layer Perspectives
Gordon J. Sutton,Jie Zeng,Ren Ping Liu,Wei Ni,Diep N. Nguyen,Beeshanga Abewardana Jayawickrama,Xiaojing Huang,Mehran Abolhasan,Zhang Zhang,Eryk Dutkiewicz,Tiejun Lv +10 more
TL;DR: This paper evaluates the relevant PHY and MAC techniques for their ability to improve the reliability and reduce the latency and identifies that enabling long-term evolution to coexist in the unlicensed spectrum is also a potential enabler of URLLC in theUnlicensed band.
Journal ArticleDOI
Analytical Modeling of Wi-Fi and LTE-LAA Coexistence: Throughput and Impact of Energy Detection Threshold
TL;DR: In this paper, the authors developed a new framework for estimating the throughput of Wi-Fi and LTE-LAA in coexistence scenarios via suitable modifications to the celebrated Bianchi model.
Posted Content
Analytical Modeling of Wi-Fi and LTE-LAA Coexistence: Throughput and Impact of Energy Detection Threshold
TL;DR: In one of the first works of its kind, a new framework for estimating the throughput of Wi-Fi and LTE-LAA in coexistence scenarios via suitable modifications to the celebrated Bianchi model is developed.
Journal ArticleDOI
On a fair coexistence of LTE and Wi-Fi in the unlicensed spectrum: A Survey
TL;DR: This paper presents an overview of the work appeared in the literature analyzing the impact of LTE on the performance of Wi-Fi and proposing solutions to mitigate such an impact and describes the main solutions that are currently being developed by standardization bodies and telecom industry.
Journal ArticleDOI
Survey of Spectrum Sharing for Inter-Technology Coexistence
TL;DR: In this article, the authors present a literature review on inter-technology 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.
References
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Journal ArticleDOI
Performance analysis of the IEEE 802.11 distributed coordination function
TL;DR: In this paper, a simple but nevertheless extremely accurate, analytical model to compute the 802.11 DCF throughput, in the assumption of finite number of terminals and ideal channel conditions, is presented.
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Probability Statistics and Random Processes for Electrical Engineering
TL;DR: In this paper, the authors present an axiomatic approach to a theory of probability, based on the axiomatization of probability models, for the analysis and design of wireless networks.
Proceedings ArticleDOI
Enabling LTE/WiFi coexistence by LTE blank subframe allocation
Erika Portela Lopes de Almeida,Andre Mendes Cavalcante,Rafael C. D. Paiva,Fabiano Chaves,Fuad Mousse Abinader,Robson D. Vieira,Sayantan Choudhury,Esa Tuomaala,Klaus Doppler +8 more
TL;DR: This paper considers two of the most prominent wireless technologies available today, namely Long Term Evolution (LTE), and WiFi, and addresses some problems that arise from their coexistence in the same band, and proposes a simple coexistence scheme that reuses the concept of almost blank subframes in LTE.
Journal ArticleDOI
Saturation throughput analysis of IEEE 802.11 in the presence of non ideal transmission channel and capture effects
TL;DR: A throughput analysis of the IEEE 802.11 protocol at the data link layer in non-saturated traffic conditions taking into account the impact of both transmission channel and capture effects in Rayleigh fading environment is provided.
Proceedings ArticleDOI
Performance Evaluation of LTE and Wi-Fi Coexistence in Unlicensed Bands
Andre Mendes Cavalcante,Erika Portela Lopes de Almeida,Robson D. Vieira,Fabiano Chaves,Rafael C. D. Paiva,Fuad Mousse Abinader,Sayantan Choudhury,Esa Tuomaala,Klaus Doppler +8 more
TL;DR: A simulator-based system- level analysis in order to assess the network performance in an office scenario shows that LTE system performance is slightly affected by coexistence whereas Wi-Fi is significantly impacted by LTE transmissions.