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
- pp 1-6
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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Proceedings ArticleDOI
A Field Trial of Wi-Fi Co-Existing with U-LTE Based on Cell On/Off on Unlicensed Spectrum
TL;DR: It is shown by trial results that Wi-Fi is not adversely impacted by U-LTE performing the cell on/off on unlicensed spectrum under two typical indoor test scenarios of dense and ultra-dense deployments, and the performances are evaluated in terms of network capacity and user perceived throughput.
Journal ArticleDOI
On the Effects of Transmit Power Control on Multi Carrier LAA-WiFi Coexistence
TL;DR: In this article , the authors proposed a coexistence method named Carrier Aggregation with Transmit Power Control (CATPC), which dynamically adjusts the LAA transmit power to reduce interference to WiFi.
Journal ArticleDOI
Towards 1 Gbps/UE in Cellular Systems: Understanding Ultra-Dense Small Cell Deployments
TL;DR: This study shows how network densification reduces multi-user diversity, and thus proportional fair alike schedulers start losing their advantages with respect to round robin ones.
Journal ArticleDOI
Modeling and performance analysis of unlicensed bands MAC strategy in multi-channel LTE-A networks with M2M/H2H coexistence
TL;DR: A new MAC protocol for LTE-U that allow friendly co-existence of H2H with M2M communications working in unlicensed bands is presented and is designed to ensure an efficient and fair channel access as well as enabling better H 2H/M2M coexistence.
Dissertation
Crowdsensing and Resource Allocation in Shared Spectrum
TL;DR: This work proposes augmenting the DBA approach with spatial-statistics-based radio mapping using Kriging and shows that it achieves more accurate coverage boundary estimation, which leads to fewer missing WS opportunities while keeping misclassifications under a certain limit.
References
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Proceedings ArticleDOI
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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.