A5032076897- Advanced Photonic Communication Systems
- Advanced Optical Network Technologies
- Optical Network Technologies
- IoT Networks and Protocols
- IoT and Edge/Fog Computing
- Wireless Body Area Networks
- Advanced MIMO Systems Optimization
- Mobile Agent-Based Network Management
- Advanced Wireless Network Optimization
- Advanced Wireless Communication Technologies
- IPv6, Mobility, Handover, Networks, Security
- Age of Information Optimization
- Mental Health via Writing
- Enterobacteriaceae and Cronobacter Research
- Energy Harvesting in Wireless Networks
- Sentiment Analysis and Opinion Mining
- Network Packet Processing and Optimization
- Seismic Imaging and Inversion Techniques
- Wireless Communication Networks Research
- Optical Wireless Communication Technologies
- Privacy-Preserving Technologies in Data
- Seismology and Earthquake Studies
- Cryptography and Data Security
- Green IT and Sustainability
- Parasitic Infections and Diagnostics
Universidade Estadual de Campinas (UNICAMP)
2016-2025
Universidade Federal do Ceará
2018
Electronics and Telecommunications Research Institute
2018
Hospital de Clínicas da Unicamp
2016
University of Cauca
2011
Network connectivity is a key issue in the realization of IoT, and LTE cellular technology most promising option for provisioning such connectivity. However, networks, large number IoT devices trying to access medium can overload RAN. In this article, we review random procedure its support applications. We also assess performance RAN control schemes proposed by 3GPP, taking into consideration interaction between packet downlink channel resource allocation.
The Internet of Things (IoT) paradigm stands for virtually interconnected objects that are identifiable and equipped with sensing, computing, communication capabilities. Services applications over the IoT architecture can take benefit long-term evolution (LTE)/LTE-Advanced (LTE-A), cellular networks to support machine-type (MTC). Moreover, it is paramount MTC do not affect services provided traditional human-type (HTC). Although previous studies have evaluated impact number devices on...
Depression is a common mental illness magnified by the COVID-19 pandemic. In this path, its early detection pivotal for public health systems. Various works have addressed depression in social network data. Nevertheless, they used data before pandemic and did not exploit transformers’ architecture capabilities realizing binary classification on extensive dimensional This paper introduces DEENT, an approach with depression-oriented dataset built BERT K-means from previous Twitter labeled...
Depression is a common mental illness magnified by the COVID-19 pandemic. In this context, early depression detection pivotal for public health systems. Various works have addressed in social network data. Nevertheless, they used data from before pandemic and did not exploit Transformers’ architecture capabilities realizing binary classification on extensive dimensional This paper aims to introduce model based encoder-only Transformer detect using large Twitter dataset collected during...
The worldwide markets for Machine-type Communication (MTC) over cellular networks are expected to grow in the incoming years. However, since MTC is quite different than existing Human-type (HTC), it poses significant challenges networks. Large number of devices anticipated be operating future Long Term Evolution (LTE) networks, bringing several service requirements. LTE standard suffers from excessive Physical Downlink Control Channel (PDCCH) overhead associated with radio resource...
The Long Term Evolution (LTE) and LTE-Advanced technologies aim at providing improved users' experience by increasing data rate, enhancing coverage supporting Quality of Service (QoS) to different service classes. However, a large number User Equipment (UE) devices trying access the network in short period can overload Radio Access Network (RAN). In this situation, more attempts system are made than it handle, resulting low probabilities poor performance. paper, we introduce QoS-Aware...
Passive optical networking has been recognized as a solution for next generation mobile backhaul network. Such technology allows service providers to reduce costs by using already deployed fiber the x systems while simultaneously supporting increasing demands broadband Internet access. In this article, we describe QoS provisioning scheme LTE/ EPON integrated networks. With approach, radio resource management functions of an device, known ONU-eNB, can take advantage information available from...
In this paper, we introduce the Preamble Priority-Aware (PPA) Packet Downlink Control Channel (PDCCH) resources allocation algorithm to provide Quality of Service (QoS) differentiation in Random Access (RA) procedure LTE-Advanced technology. The PPA uses preamble priority defined by RA and Radio Network (RAN) overload control schemes make scheduling decisions. Results derived via simulation show that proposed PDCCH significantly increases chance accessing network as well reducing...
Machine-type Communication (MTC) enables devices to exchange information in an autonomous way without human intervention. Hence, new applications can be developed benefiting from a richer awareness of the surrounding environment. However, deployment MTC over cellular networks creates challenges contention-based Random Access (RA) procedure as well resource allocation for with low impact on Human-to-Human (H2H) services. In this paper, we analyze massive number traditional H2H users Long Term...
Federated learning (FL) is a distributed approach that enables collaborative training of shared machine (ML) model for given task. FL requires bandwidth-demanding communication between devices and central server, which cause many issues such as bottlenecks scaling in the network. Therefore, we introduce CCS (Compressed Client Selection) algorithm aimed at decreasing overall costs fitting environment. employs biased client selection strategy reduces number ML rounds required to reach...
This paper introduces a novel time-domain (TD) LTE uplink scheduler called Z-Based QoS Scheduler (ZBQoS) which is fully standard-compliant. The ZBQoS provides Quality of Service (QoS) requirements, supporting delay bound and guaranteed rate even when the network heavily loaded. We evaluate proposed under heterogeneous traffic compare its performance to that another TD scheduler, Bandwidth Aware (BQA), recently proposed. Simulation results show reduces significantly real-time traffic, while...
The collision of multiple MSG <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> transmissions due to the selection same preamble sequence in Long Term Evolution (LTE) Random Access procedure is an important problem which can impact on performance cellular Internet Things (IoT) networks. In this paper, we propose a standard-compatible probabilistic retransmission approach reduce number collisions messages IoT technologies. our proposal,...
This paper introduces a mechanism for the support of multi-ONU service level agreements (SLAs) in dynamic bandwidth allocation (DBA) algorithms Ethernet passive optical networks (EPON). The employment SLAs multiple network units (ONUs) instead individual ONUs allows better utilization reserved these ONUs. proposed DBA customers owning to redistribute aggregated group balance utilization. can be employed different use cases such as mobile backhauling/fronthauling, PON virtualization, and...
Federated Learning (FL) is a distributed machine learning type of processing that preserves the privacy user data, sharing only parameters ML models with common server. The FL requires specific latency and bandwidth demands must be fulfilled by operation communication network. This article introduces two Dynamic Wavelength Bandwidth Allocation algorithms for TWDM-PONs: one based on reservation other statistical multiplexing Quality Service provisioning traffic over 50 Gb/s Ethernet Passive...
This paper introduces a novel LTE uplink scheduler called Hybrid Z-Based QoS Scheduler (HZBQoS), fully standard-compliant designed to operate in ONU-eNB devices of integrated LTE/TDM-EPON networks. The HZBQoS provides delay bound and guaranteed rate even when the backhaul mobile network are heavily loaded. We evaluated proposed under heterogeneous traffic compared its performance that another scheduler, (ZBQoS), which does not take into account variability link capacity. Simulation results...
A key component of the Internet things (IoT) ecosystem is wide-area network connectivity, for which cellular technologies are a promising option through their support massive machine-type communications (mMTC). However, numerous devices transmitting sporadically small data packets in highly synchronized way can generate overload on radio access network. This situation leads to shortage resources, especially those associated with random procedure contention, control, and transmission, causing...
This paper provides a description of key results stemming from experiments conducted at the wireless/optical boundary. The main aim is to show advantages converged optical/wireless network deployment, which uses very recent technologies like SDN, Virtualization, fog and cloud computing, Radio-over fiber. are mainly taken out an international collaborative research project called FUTEBOL (Federated Union Telecommunications Research Facilities for EU BrazilOpenLaboratory).
The Random Access (RA)procedure is one of the most frequently used and energy consuming operations in LTE User Equipment (UE)devices. However, little attention has been given to its energy-efficient operation literature. In this paper, we propose two Physical Channel (PRACH)power control mechanisms for improving efficiency overall RA procedure. Our proposals increase preamble transmit power based on special characteristics UE consumption behavior. By doing this, number transmitted per...
Infrastructure service providers (InPs) can employ bandwidth sharing to offer new services and business models their customers. In this paper, we introduce a dynamic allocation (DBA) algorithm which allows cooperation among Ethernet PON (EPON) customers so that they share unused themselves without affecting guaranteed bandwidth. Simulation results show our proposal increases the throughput decreases delay for cooperative
The concept of preamble-priority awareness in downlink control signaling scheduling was recently proposed to provide Quality Service (QoS) differentiation the Random Access (RA) procedure LTE/LTE-Advanced technology. This approach employs information about levels used initial phase RA schedule random access response messages. In this paper, we extend application other messages and analyze its impact when RACH Resource Separation (RRS) scheme traditional with both contention-free...
Radio over Fiber (RoF) is one of the main technologies for next-generation access networks due to its immunity electromagnetic interference, low latency, power consumption and high transmission capacity. RoF enables processing several radio frequency (RF) signals in a centralized location, reducing both capital expenditures (CAPEX) operating (OPEX). This paper describes testbed Internet-of-Things (IoT) environmental monitoring based on that under development framework H2020 FUTEBOL project....
Este artigo apresenta a avaliação de desempenho um mecanismo escalável acesso aleatório para atender as demandas escalabilidade no aos recursos rádio em redes móveis. O permite acessar rede utilizando uma palavra-código formada pela agregação n preâmbulos ortogonais transmitidos slots aleatórios diferentes, aumentando significativamente o número contenção que os dispositivos podem utilizar durante procedimento nestas redes. Deriva-se modelo analítico esquema e apresenta-se algoritmo cálculo...