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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Journal ArticleDOI
ORLA/OLAA: Orthogonal Coexistence of LAA and WiFi in Unlicensed Spectrum
TL;DR: In this article, an orthogonal (collision-free) listen-before-talk coexistence paradigm is proposed to enable fair coexistence with incumbent WiFi networks, which provides a substantial improvement in performance, yet imposes no penalty on existing WiFi networks.
Journal ArticleDOI
Resource Allocation for Licensed/Unlicensed Carrier Aggregation MIMO Systems
TL;DR: A novel CA scheme is proposed for licensed/unlicensed MIMO LTE systems that allocates optimally the resources (power and resource blocks) of an evolved Node B to user equipments and an optimal low complexity method is proposed based on the Lagrange dual decomposition.
Journal ArticleDOI
CBRS Spectrum Sharing between LTE-U and WiFi: A Multiarmed Bandit Approach
TL;DR: This paper considers LTE-U to operate as a General Authorized Access (GAA) user and develops a multiarmed bandit (MAB) based spectrum sharing technique for a smooth coexistence with WiFi and incorporates downlink power control which yields a high energy efficiency and interference suppression.
Proceedings ArticleDOI
Modeling and Analyzing the Coexistence of Licensed-Assisted Access LTE and Wi-Fi
TL;DR: Stochastic geometry is used to characterize key performance metrics of neighboring LAA and Wi-Fi networks and shows that LAA can improve the DST and data rate performance ofWi-Fi by adopting more sensitive clear channel assessment thresholds and/or larger contention window sizes.
Journal ArticleDOI
Fair Downlink Traffic Management for Hybrid LAA-LTE/Wi-Fi Networks
TL;DR: Numerical results show the FDTM scheme can guarantee the throughput performance of Wi-Fi networks in shared unlicensed spectrum while supporting proportional fairness for the LAA eNBs with different traffic loads.
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.