This paper addresses multi-user multi-cluster massive multiple-input-multiple-output (MIMO) systems with non-orthogonal multiple access (NOMA). Assuming the downlink mode, and taking into consideration impact of imperfect successive interference cancellation (SIC), an in-depth analytical analysis is carried out, in which closed-form expressions for outage probability ergodic rates are derived. Subsequently, power allocation coefficients users within each sub-group optimized to maximize...

A dual-polarized intelligent reflecting surface (IRS) can contribute to a better multiplexing of interfering wireless users. In this paper, we use feature improve the performance massive multiple-input multiple-output (MIMO) with non-orthogonal multiple access (NOMA) under imperfect successive interference cancellation (SIC). By considering downlink multi-cluster scenario, IRSs assist base station (BS) multiplex subsets users in polarization domain. Our novel strategy alleviates impact SIC...

Deploying access and backhaul as wireless links, a.k.a. integrated (IAB), is envisioned a viable approach to enable flexible dense networks. Even further, mobile IAB (mIAB) candidate solution enhance the connectivity of multiple user equipment (UE) moving together. In this context, different other works from literature, present work overviews basis for deployment mIAB by presenting: 1) current status standardization in fifth generation (5G) new radio (NR); 2) taxonomy state-of-the-art...

This paper investigates the performance of cooperative networks based on non-orthogonal multiple access (NOMA) with full-duplex decode-and-forward relays. Taking into account rate fairness between users and assuming imperfect successive interference cancellation (SIC), problem is formulated so that power allocation performed adaptively by relays in order to maximize minimum users' achievable rate. We demonstrate proposed optimization convex a closed-form expression for factor derived. The...

We formulate the resource assignment problem of maximizing spectral efficiency a wireless system subject to user satisfaction constraints in multiservice scenario that is challenging allocation from operators' point view. show although this optimization nonlinear, it can be converted an integer linear program. This way, optimal solution obtained by standard techniques. Due high computational complexity obtain solution, we propose fast suboptimal algorithm named Reallocation-based Assignment...

This article presents a QoE-aware resource assignment and power allocation framework aiming at maximizing the minimum MOS of users in wireless network. It considers satisfaction factor, that is, requirement related to number should be satisfied. is an important aspect from operators’ point view has not yet been studied this context, as far we know. The proposed method evaluated by means simulations, obtained results show it outperforms existing solutions, performs close optimal solution...

We study the impact of scheduling algorithms on provision multiple services in long term evolution (LTE) system. In order to measure how well are provided by system, we use definition joint system capacity. this context, claim that strategies should consider current satisfaction level each service and offered load service. propose a downlink‐scheduling strategy according these ideas named capacity‐driven resource allocation (CRA). The CRA scheduler dynamically controls sharing among flows...

In this paper, we study the downlink resource assignment problem of maximizing total data rate subject to minimum satisfaction guarantees in multiservice scenarios assuming use multiuser (MU) multiple-input-multiple-output (MIMO) techniques. With MU MIMO techniques, same frequency can be shared by different terminals at time assigning spatial channels each terminal. Different from single-user (SU) access per where consists searching for best association between resources and terminals, with...

In fifth generation (5G) wireless cellular networks, millimeter wave spectrum opens room for several potential improvements in throughput, reliability, latency, among other aspects. However, it also brings challenges, such as a higher influence of blockage which may significantly limit the coverage. this context, network-controlled repeaters (NCRs) are network nodes with low complexity that represent technique to overcome coverage problems. paper, we introduce NCR concept and study its...

This work investigates the space-division multiple access grouping problem in multiuser massive input output (MIMO). The adopted approach consists performing firstly K-means algorithm, that is a classification algorithm well known machine learning field, to split mobile stations (MSs) into spatially compatible clusters based on knowledge of users' spatial covariance matrices. Secondly, it schedules sub-set MSs from each cluster thus supporting streams per cluster. Furthermore, are selected...

Abstract In order to keep and/or expand its share of the wireless communication market and decrease churn, it is important for network operators their users (clients) satisfied. The problem be solved how increase number satisfied non‐real time (NRT) real (RT) in downlink radio access an orthogonal frequency division multiple system. this context, present work proposes a method solve referred using unified resource allocation (RRA) framework based on utility theory. This RRA particularized...

In this article, we study a Radio Resource Allocation (RRA) that was formulated as non-convex optimization problem whose main aim is to maximize the spectral efficiency subject satisfaction guarantees in multiservice wireless systems. This has already been previously investigated literature and efficient heuristics have proposed. However, order assess performance of Machine Learning (ML) algorithms when solving problems context RRA, revisit propose solution based on Reinforcement (RL)...

Millimeter wave (mmWave) and sub-THz communications, foreseen for sixth generation (6G), suffer from high propagation losses which affect the network coverage. To address this point, smart entities such as network-controlled repeaters (NCRs) have been considered cost-efficient solutions coverage extension. NCRs, standardized in 3rd partnership project Release 18, are radio frequency with beamforming capability controlled by through side control information. Another challenge raised adoption...

In this paper a radio resource allocation (RRA) and scheduling algorithm to maximize the satisfaction of users served by an orthogonal frequency division multiple access (OFDMA) system is proposed. The oriented (SORA) algorithm, based on low complexity heuristics, divides into two sets: satisfied unsatisfied. Then, it performs taking advantage channel selectivity characteristics each set. main proposed capacity keeping high number resources from that would be unsatisfied in any case.

Integrated access and backhaul (IAB) is envisioned as a possible solution to address the need for network densification in situations where fiber connection not viable. In Release 18, 3rd generation partnership project (3GPP) will take another step on extending IAB capabilities. With mobile (mIAB), nodes can be deployed within vehicles, e.g., buses. As every new technology, performance assessment evaluation of impact interference interest industry academia. this paper, we present...

Radio Resource Allocation (RRA) in cellular systems is a relevant and difficult task that shouldassign the system resources most efficient manner while fulfilling different constraints suchas Quality of Service (QoS). In wireless employ Single Carrier - Frequency DivisionMultiple Access (SC-FDMA) as Long Term Evolution (LTE) uplink, RRA even more difficultsince frequency should be assigned contiguous blocks subcarriers to eachterminal. this work we study two important problems SC-FDMA: total...

This letter studies the resource allocation problem of sum rate maximization in wireless powered communication networks (WPCNs) with non-orthogonal multiple access (NOMA) that satisfy minimum data requirements per user. Firstly, we derive closed-form solutions for time-splitting ratio and power coefficients maximize approximated NOMA expression. Then, use solution as starting point solving original through Newton's method. Simulation results show effectiveness proposed approximation well...

This work proposes a framework for multiuser massive Multiple Input Output (MIMO) systems which is composed of three parts – <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">clustering</i> , xmlns:xlink="http://www.w3.org/1999/xlink">grouping</i> and xmlns:xlink="http://www.w3.org/1999/xlink">scheduling</i> aims at maximizing the total system data rate considering Quality Service (QoS) constraints. We firstly use clustering algorithm to create...

In this work we study different scheduling problems in the downlink of a Frequency Division Duplex multiuser wireless system that employs hybrid precoding antenna architecture for massive Multiple Input Output. context, propose framework using Reinforcement Learning (RL) tools, namely Contextual Multi-Armed Bandits (CMAB), can dynamically adapt themselves to solve three problems, which are: i) Maximum Throughput (MT); ii) with Fairness Guarantees (MTFG), and; iii) QoS (MTQG), are well-known...

Mobile communication systems are continuously evolving and the search for new technologies is a never-ending activity in industry academy. Rate-Splitting Multiple Access (RSMA) recent multiple access scheme multi-antenna wireless networks that enjoys advantages of both Space Division (SDMA) non-orthogonal (NOMA). Considering multicarrier RSMA-based system, this work studies user matching, subcarrier assignment power allocation among subcarriers with objective maximizing weighted sum rate. So...

This paper proposes a time-frequency scheduling algorithm to maximize the satisfaction of users served by an Orthogonal Frequency Division Multiple Access (OFDMA) system. The Satisfaction Oriented Resource Allocation (SORA) takes into account in its formulation channel quality, Quality Service (QoS) requirements and effect past allocations, so as select, intelligent way, set that can be more easily satisfied according system conditions.

Coenosia attenuata Stein (1903) is a predatory fly that commonly found in greenhouses and open fields preying on whiteflies, leafminers, psocopterans other insects. The species widespread the Old World its distribution has expanded recent times to Neotropical countries including Chile, Colombia, Costa Rica, Ecuador Peru. We report here for first time presence of C. Brazil, occurring different sites State Ceará (Northeastern Brazil). Expansion range this muscid eastern parts South America...

In this paper we study radio resource allocation for cooperative networks with multiple relay and destination nodes employing orthogonal frequency-division access. Resource in our scenario is composed of selection, subcarrier pairing assignment as well transmit power allocation. Motivated by the increased concern about energy efficiency, propose total efficiency optimization a subject to quality service constraints. Although formulated problem integer non linear, managed optimally solve...