The recent development of regulatory policies that permit the use TV bands spectrum on a secondary basis has motivated discussion about coexistence primary (e.g. broadcasts) and users WiFi in spectrum). However, much less attention been given to different wireless technologies white spaces. Lack coordination between networks may create severe interference situations, resulting efficient usage spectrum. In this paper, we consider two most prominent available today, namely Long Term Evolution...

The deployment of modern mobile systems has faced severe challenges due to the current spectrum scarcity. situation been further worsened by development different wireless technologies and standards that can be used in same frequency band. Furthermore, usage smaller cells (e.g. pico, femto LAN), coexistence among heterogeneous networks (including amongst such as LTE Wi-Fi deployed band) a big field research academy industry. In this paper, we provide performance evaluation between show some...

The expansion of wireless broadband access network deployments is resulting in increased scarcity available radio spectrum. It very likely that the near future, cellular technologies and local area networks will need to coexist same unlicensed bands. However, two most prominent technologies, LTE Wi-Fi, were designed work different bands not a shared band. In this article, we discuss issues arise from concurrent operation Wi-Fi point view resource management. We show severely impacted by...

Spectrum sharing is a powerful alternative to deal with the exponential increase on wireless communication capacity demand. In this context, coexistence of two most prominent technologies today, Long Term Evolution (LTE) and Wi-Fi, an important research topic. common Wi-Fi network operation, Distributed Coordination Function (DCF), nodes access channel only if interference level below certain threshold. Then, operation severely affected when in LTE. This paper proposes use LTE uplink (UL)...

Beam management is central in the operation of beamformed wireless cellular systems such as 5G New Radio (NR) networks. Focusing energy radiated to mobile terminals (MTs) by increasing number beams per cell increases signal power and decreases interference, has hence potential bring major improvements on area spectral efficiency (ASE). This paper proposes a first system-level stochastic geometry model encompassing aspects beam problem: frequencies, antenna configurations, propagation;...

Bandwidth Parts (BWPs) is a 5G NR feature introduced in 3GPP Release 15 for dynamically adapting the carrier bandwidth and numerology which UE operates. BWP allows supporting multiple services per carrier, e.g. eMBB mMTC. Although enables higher spectrum flexibility power savings, effect of delays such as Inactivity Timer Switch Delay has not been thoroughly studied understood. This paper presents system-level evaluation deployment with dynamic adaptation. As expected, results indicate no...

5G New Radio (NR) incorporates numerous beam-based novel features such as beam management procedures for selecting the best serving gNB beam, recovery from failures, inter-cell mobility support and advanced UEs with multiple directional panels. In this paper, we study joint performance of all these techniques a macro cellular scenario at 28 GHz special emphasis on how UE antenna design influences system-level performance. It is shown that full benefits can be delivered introduction panels...

The default medium access mechanism for Wi-Fi, Distributed Coordination Function (DCF), is a simple contention based protocol aimed at providing fair distribution of resources among Wi-Fi nodes. However, DCF suffers from significant performance degradation in the presence dense deployments. Hence, improving MAC layer essential efficient spectrum sharing overlapping Basic Subscriber Set (OBSS) next generation wireless networks. In this context, paper, we compare with an existing mechanisms,...

Wireless communications industry foresees an exponential increase of the traffic demand for next years.Spectrum scarcity operation cellular networks makes use unlicensed spectrum attractive alternative offload.From technical perspective, LTE pico/femtocells arise as preferable offload solution.On other hand, Wi-Fi broad and low cost deployment it a competitive solution.The both technologies is thus possible scenario which brings some challenges.This paper discusses LTE/Wi-Fi coexistence...

Modern wireless systems employ adaptive techniques to provide high throughput while observing desired coverage, Quality of Service (QoS) and capacity. An alternative further enhance data rate is apply cognitive radio concepts, where a system able exploit unused spectrum on existing licensed bands by sensing the opportunistically access portions. Techniques like Automatic Modulation Classification (AMC) could help or be vital for such scenarios. Usually, AMC implementations rely some form...

Beam management is central in the operation of dense 5G cellular networks. Focusing energy radiated to mobile terminals (MTs) by increasing number beams per cell increases signal power and decreases interference, has hence potential bring major improvements on area spectral efficiency (ASE). This benefit, however, comes with unavoidable overheads that increase MT speed. paper proposes a first system-level stochastic geometry model encompassing aspects beam problem: frequencies, antennas,...

Several Medium Access Control (MAC) based beam management procedures have been adopted in the 3rd Generation Partnership Project (3GPP) to support beam-based communication 5G New Radio (NR). These connected mode functionalities include tracking, failure detection and recovery. This paper provides a detailed system-level performance analysis of for Frequency Range 1 (FR1) macro-cellular environments. Assumptions which are left open User Equipment (UE) implementation also discussed. Extensive...

The increasing commercial success of Wi-Fi and the wireless communication industry forecast exponential traffic growth for next years indicate dense deployments as scenarios more common in future. was not designed to operate such scenarios. Because its contention based channel access backoff procedure, presents low efficiency sensible performance degradation terms user throughput deployments. This paper discusses challenges operation deployment benefits a proposed adaptive transmit power...

There is substantial literature covering both problems and solutions related to the operation of Long Term Evolution (LTE) networks in unlicensed spectrum (LTE-U) while coexistence with other technologies, such as Wi-Fi. However, a seldom explored scenario between multiple LTE-U networks. Within this scenario, big issue establishing optimal configurations that take into account fairness among different operators coexisting same coverage area. Solutions problem could, for instance, react...

Time series forecasting with the use of Artificial Neural Networks (ANN), in special self-organized maps (SOM), has been explored literature good results. One strategy for improving computational cost and specialization SOMs general is constructing it via hierarchical structures. This work presents four different heuristics time prediction, evaluating their forecast precision providing insight on future enhancements.

Energy availability is the main delimiter for usage time of mobile devices. As wireless network interfaces are usually most power-demanding subsystem in a device, mechanisms their power consumption optimization extensively researched. However, determining saving gains from using such optimizations not an easy task, specially simulation-based analysis. This work presents extended model WiMAX interface Mobile Nodes (MN), capable capturing minimal contributions as signalling overhead or burst...

5G New Radio (NR) introduces the Bandwidth Part (BWP) concept, offering enhanced flexibility in resource allocation within a carrier. BWPs enable dynamic spectrum utilization and power efficiency by allowing carriers to be subdivided for diverse purposes. Massive Machine-Type Communication (mMTC), characterized its massive number of low-power consumption devices, is one use case that can clearly benefit from this feature. However, there plethora BWP configuration parameters conflicting...

This paper presents the OpenRAN@Brasil testbed, designed to address challenges of Open RAN deployments in Brazil. It is composed by commercial off-the-shelf 5G components, distributed over two sites, and interconnected a 400 km midhaul link. We use this evaluate end-to-end network performance (latency throughput) under diverse signal conditions. Results show that long-haul link increases latency up 28 ms, degrading downlink throughput Mbps, while lower uplink less affected. These findings...