High altitude platform station (HAPS), which is deployed in the stratosphere at an of 20-50 kilometres, has attracted much attention recent years due to their large footprint, line-ofsight links, and fixed position relative Earth. Compared with existing network infrastructure, HAPS a larger coverage area than terrestrial base stations closer satellites ground users. Besides small-cells macro- cells, can offer one mega-cell, complement legacy networks 6G beyond wireless systems. This article...

In this paper, we consider the coordinated multipoint (CoMP) transmission design for downlink cloud radio access network (Cloud-RAN). Our aims to optimize set of remote heads (RRHs) serving each user and precoding power minimize total while maintaining fronthaul capacity users' quality-of-service (QoS) constraints. The constraint involves a nonconvex discontinuous function that renders optimal exhaustive search method unaffordable large networks. To address challenge, propose two...

Research on 5G mobile wireless technologies has been very active in both academia and industry the past few years. While there certain consensus overall requirements of systems (e.g., data rate, network capacity, delay), various enabling have considered studied to achieve these performance targets. It quite clear, however, that would be no single technology can all diverse even conflicting requirements. In general, many fundamental changes innovations re-engineer architecture algorithms...

In this paper, we consider the energy-efficient co-ordinated transmission design for downlink in cloud radio access network (Cloud-RAN) considering fronthaul capacity and user QoS constraints. Specifically, assume that baseband signals are processed cloud, which delivered to remote heads (RRHs) equipped with multiple antennas over links transmissions single-antenna users. The amounts determine set of RRHs serve each as well precoding power levels while maintaining Toward end, study two...

We investigate the cooperative transmission design for cloud radio access network (C-RAN) considering fronthaul capacity and processing constraints. Specifically, we consider joint scheme where baseband signals precoding vectors are processed calculated by cloud, which delivered over links to remote heads (RRHs) form RF being transmitted users. formulate optimization problem allocation of RRHs, capacity, BBU resources minimize total power subject QoS constraints present both optimal...

Cognitive systems are dynamical that adapt their behavior to achieve sophisticated outcomes in nonstationary environments. This paper considers two cognitive aspects regarding the problem of distributed caching with limited capacity a content distribution network serves YouTube users multiple edge servers: first, theory revealed preference from microeconomics is used estimate human utility maximization behavior. In particular, nonparametric learning algorithm provided request probability...

A general framework for user selection in the broadcast channel with multiuser linear and nonlinear precoding techniques is investigated. Assuming full knowledge of channel-state information at transmitter using a minimum-mean-square-error (MMSE) criterion, we propose several user-selection algorithms based on conventional incremental decremental search approaches. Furthermore, novel iterative approach introduced, offering flexible performance-complexity tradeoff. New grouping are also...

We consider the joint WiFi offloading, admission control, and network management for integrated OFDMA-based cellular network. Specifically, we propose a quality-of-service (QoS) mobility-aware control scheme that efficiently offloads macrocell traffic to integrates novel bandwidth <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">borrow-return</i> strategy while guaranteeing QoS requirements users. These constraints are explicitly modeled...

In this paper, we introduce new solutions to handle real-time video traffic, such as conferencing, in the future software-defined radio access networks. The is well-known for its high peak-to-mean rate ratio. This a major challenge traffic engineering and resource allocation, especially small cell We first propose an online method dynamically estimate effective of flows, which network should support order provide satisfactory quality experience. Second, methods taking into account...

The low Earth orbit (LEO) satellite-assisted communications are envisioned as a prospective solution in next-generation networks to provide reliable, flexible, cost-effective, and globally seamless services. In this paper, we investigate satellite-terrestrial vehicular network (STVN) supporting connected autonomous vehicle (CAV) applications anytime anywhere. We first establish model for the LEO satellite-CAV communication system with different satellite orbital parameters. Then performance...

This paper presents a framework to coordinate the operation of radio nodes for future fifth generation (5G) mobile wireless networks. Based on software-defined operation, we introduce entities control plane and interaction among them in this framework. The brings number benefits. It adapts coordination network traffic dynamics, enables flexible, on-demand node optimization, reduces overhead bandwidth, energy processing power. To verify effectiveness proposed framework, deployment scenario is...

This article proposes a framework for evaluating and modeling perception systems, motivated by the need to develop testing scenarios verification validation of autonomous driving systems operating in various environment approaches, including both ego-vehicle centric cooperative with enabled connectivity. The proposed system evaluation approach is probabilistic, failures errors encoded as stochastic processes accounts operation domain. error model parameterized consider spatial temporal...

Reduced-complexity receive antenna selection methods are proposed for interference rejection combining receiver of femtocell base stations. The designed cases with exact channel information and covariance matrix plus noise at the receiver. Simulation results show that presented can almost achieve same performance obtained by an exhaustive selection, while complexity is significantly reduced. More important, perform well even when number interferers equal or greater than active antennas.

Connected autonomous vehicle (CAV) systems could bring considerable benefits to our daily lives, and possibly outperform single (AV). Nevertheless, the real-time determination of optimal route for each connected within a continuous space presents challenge. This difficulty arises from exponential growth potential motion combinations CAVs, considering diverse road geometries they encounter. article proposed CAV group planning framework overcome this The works hierarchically. global local...

User selection for multiuser linear precoding in broadcast channel is investigated this paper. Assuming complete knowledge of state information at the transmitter, new user algorithms are introduced using minimum mean square error criterion. A novel iterative proposed offering a flexible performance-complexity tradeoff. New also developed orthogonal frequency division multiple access systems. Simulation results show that methods outperform well-known algorithms, which select users based on...

We explore the effect of imperfect knowledge on multipoint downlink traffic engineering (TE) (with dynamic point selection DPS) computed centrally and jointly with power control (PC) optimization versus distributed PC techniques. Instead considering a single metric that shows qualities in dimension, we observe both performance resilience by observing how many users get quality experience (QoE) — or otherwise, would complain they do not receive expected service. identify centralized provides...

Co-channel interference (CCI) is one of the major hindering factors wireless system capacity and quality experience (QoE) to users. Radio coordination (RC) techniques have been investigated control CCI. Clustering, as a bootstrapping step RC, defines which subset radio nodes should be coordinated together. As typical RC technique, cluster-based power not well studied in literature. Existing solutions include all single cluster, or they rely on pre-defined fixed clusters. In this tutorial we...

We derive closed-form expressions for reasonably tight lower bounds and upper the signal-to-interference ratio (SIR), consequently, coverage probabilities, in wireless cellular networks with heterogeneous spatial traffic distribution, especially cases where locations of users base stations are correlated. The model used this letter is tractable, adjustable, more realistic compared existing models literature. show that SIR follows an exponentially modified Gaussian distribution scenarios.

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, a new class of full-diversity, rate-one space–time block codes (STBCs) called semiorthogonal algebraic (SAST codes) is proposed. SAST are delay optimal when the number transmit antennas even. The codeword matrix has generalized Alamouti structure where transmitted symbols replaced by circulant matrices and commutativity simplifies detection symbols. with maximal coding gain...

A method to design receive beamforming vectors with user selection is proposed for the multiuser Tomlinson-Harashima precoding, where each equipped multiple antennas. The exploits relationship between LQ decomposition and Gram-Schmidt process jointly optimize of users. Furthermore, a new approach presented reduce amount information required send from base station Simulation results are provided support advantages schemes.

Methods to design combining vectors at the receiver for multiantenna users in multiuser multiple-input multiple-output downlink channel are presented. The proposed methods applicable linear and nonlinear precoding. A fast user ordering algorithm is provided reduce computational complexity. Furthermore, an adaptive codebook presented decrease precoding complexity amount of overhead information downlink. Simulation results show significant gains compared with other such as receive antenna...

The software-defined networking (SDN) concept is an efficient solution to manage highly complex wired networks, such as large-scaled data centers and fixed Internet network. basic idea of SDN separate the control forwarding functions routers so that traffic engineering (TE) optimization can be dynamically made by a central controller. However application in dense wireless networks not straightforward. Unlike channel capacity always changes, depending on mobility users, fading interference....

This paper presents an optimization framework for downlink transmission parameters of mobile cellular systems. A typical network approach is to divide the into disjoint clusters base-stations (BS). Optimization then performed within each cluster important such as transmit power, precoder, etc. widely adopted in academic research and industrial standard bodies, e.g. 3GPP LTE-Advanced. While reducing complexity, this strategy suffers from a performance limit due interference nodes outside...

Network densification is one of key technologies in future networks to significantly increase network capacity. The gain obtained by for fixed terminals have been studied and proved. However mobility users, there are a number issues, such as more frequent handover, packet loss due high mobility, interference management so on. conventional solutions handover speed mobiles macro base stations or multicast traffic multiple stations. These fail exploit the capacity dense overuse backhaul In this...

A generalized method, namely non-uniform perturbation, to disign perturbation signal and decoder for the multiuser vector (VP) precoding is proposed. In this at transmitter can take integer non-integer values. new decoding method presented design, in which statistic of not required remove receiver. Compared with conventional VP scheme yields significant performance gain.