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
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TLDR
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.Abstract:
The deployment of modern mobile systems has faced severe challenges due to the current spectrum scarcity. The situation has been further worsened by the development of different wireless technologies and standards that can be used in the same frequency band. Furthermore, the usage of smaller cells (e.g. pico, femto and wireless LAN), coexistence among heterogeneous networks (including amongst different wireless technologies such as LTE and Wi-Fi deployed in the same frequency band) has been a big field of research in the academy and industry. In this paper, we provide a performance evaluation of coexistence between LTE and Wi-Fi systems and show some of the challenges faced by the different technologies. We focus on a simulator-based system- level analysis in order to assess the network performance in an office scenario. Simulation results show that LTE system performance is slightly affected by coexistence whereas Wi-Fi is significantly impacted by LTE transmissions. In coexistence, the Wi-Fi channel is most often blocked by LTE interference, making the Wi-Fi nodes to stay on the LISTEN mode more than 96% of the time. This reflects directly on the Wi-Fi user throughput, that decreases from 70% to ≈100% depending on the scenario. Finally, some of the main issues that limit the LTE/Wi-Fi coexistence and some pointers on the mutual interference management of both the systems are provided.read more
Citations
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Patent
Method for sharing of unlicensed radio frequency bands by cellular LTE and WiFi networks
Tommaso Melodia,Zhangyu Guan +1 more
TL;DR: In this article, the spectrum sharing problem is modeled as a fairness constrained mixed integer nonlinear optimization problem, by jointly determining dynamic channel selection, carrier aggregation and fractional spectrum access for the first wireless networks, while guaranteeing fair spectrum access to the coexisting wireless networks based on a cross-technology fairness criterion.
Journal ArticleDOI
Interference management using direct sequence spread spectrum (DSSS) technique in LTE-Wi-Fi network
TL;DR: In this paper, an enhanced DSSS technique was proposed which considers both serving and its neighboring base stations in the network, and new coefficients, chip rate coefficient (a ) and radius fraction coefficient (b ) were applied in DSSs technique in order to improve the SINR value.
Dissertation
Advanced Technologies Enabling Unlicensed Spectrum Utilization in Cellular Networks
TL;DR: This thesis proposes a priority-based Wi-fi transmission scheme with congestion control and studied the throughput of the native Wi-Fi network, as well as the LWA user delay when the nativeWi-Fi user is under heavy traffic conditions.
Posted Content
Wi-Fi Coexistence with Duty Cycled LTE-U
TL;DR: This paper investigates theWi-Fi performance in the presence of duty cycle based LTE-U transmission on the same channel and uses the Monte Carlo analysis to demonstrate the fairness of Wi-Fi and LTE- U air time sharing.
Proceedings ArticleDOI
Error-Based Interference Detection in WiFi Networks
TL;DR: This paper detects and identifies cross-technology interference on off-the-shelf WiFi cards by monitoring the sequence of receiver errors and develops an Artificial Neural Network (ANN) to recognize the source of interference.
References
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Proceedings ArticleDOI
LTE Capacity Compared to the Shannon Bound
Preben Mogensen,Wei Na,Istvan Z. Kovacs,Frank Frederiksen,A. Pokhariyal,Klaus I. Pedersen,Troels Kolding,Klaus Hugl,Markku Kuusela +8 more
TL;DR: An adjusted Shannon capacity formula is introduced, where it is shown that the bandwidth efficiency can be calculated based on system parameters, while the SNR efficiency is extracted from detailed link level studies.
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.
Proceedings ArticleDOI
Understanding and mitigating the impact of RF interference on 802.11 networks
TL;DR: A channel hopping design is prototype using PRISM NICs, and it is found that it can sustain throughput at levels of RF interference well above that needed to disrupt unmodified links, and at a reasonable cost in terms of switching overheads.