Cloud-based vehicular networks are a promising paradigm to improve services through distributing computation tasks between remote clouds and local terminals. To further reduce the latency transmission cost of off-loading, we propose cloud-based mobileedge computing (MEC) off-loading framework in networks. In this framework, study effectiveness transfer strategies with vehicle-to-infrastructure (V2I) vehicle-to-vehicle (V2V) communication modes. Considering time consumption task execution...

Millimeter-wave communication is a promising technology for future 5G cellular networks to provide very high data rate (multi-gigabits-persecond) mobile devices. Enabling D2D communications over directional mmWave of critical importance efficiently use the large bandwidth increase network capacity. In this article, propagation features and associated impacts on are discussed. We introduce an mmWave+4G system architecture with TDMA-based MAC structure as candidate networks. propose effective...

Led by industrialization of smart cities, numerous interconnected mobile devices, and novel applications have emerged in the urban environment, providing great opportunities to realize industrial automation. In this context, autonomous driving is an attractive issue, which leverages large amounts sensory information for navigation while posing intensive computation demands on resource constrained vehicles. Mobile edge computing (MEC) a potential solution alleviate heavy burden devices....

Along with modern wireless networks being content-centric, the demand for rich multimedia services has been growing at a tremendous pace, which brings significant challenges to mobile in terms of need massive content delivery. Edge caching emerged as promising approach alleviate heavy burden on data transmission through and forwarding contents edge networks. However, existing studies always treat storage computing resources separately, neglect mobility characteristic both nodes end users....

IoT, a heterogeneous interconnection of smart devices, is great platform to develop novel mobile applications. Resource constrained however, often become the bottlenecks fully realize such developments, especially when it comes intensive-computation-oriented and low-latency-demanding MEC promising approach address challenges. In this article, we focus on applications for energy efficiency as well offloading performance in terms end-user experience. regard, present mobility-aware hierarchical...

The terahertz (THz) antennas, which have features of small size, wide frequency bandwidth and high data rate, are important devices for transmitting receiving THz electromagnetic waves in the emerging systems. However, most antennas suffer from relatively loss low fabrication precision due to their sizes bands waves. Therefore, this paper presents a detailed overview recent research on performance improvement antennas. Firstly, development is briefly reviewed basic design ideas introduced....

This paper proposes a novel theoretical non-stationary three dimensional (3-D) wideband twin-cluster channel model for massive multiple-input multiple-output (MIMO) communication systems with carrier frequencies on the order of gigahertz (GHz). As dimension antenna arrays cannot be ignored MIMO, near field effects instead far are considered in proposed model. These include spherical wavefront assumption and birth-death process to properties clusters such as cluster appearance disappearance...

This letter introduces a wideband circularly polarized (CP) cross-dipole antenna fabricated on double-layered printed circuit board (PCB) substrate for 2.45-GHz ISM band wireless communications. Unlike conventional antennas, the proposed cross dipole is designed with wide open ends such that both impedance and axial-ratio (AR) bandwidths are enhanced. In addition, to excite CP radiation effectively, curved-delay line providing an orthogonal phase difference among elements attached at corners...

Mobile edge computing (MEC) has emerged as a promising paradigm to realize user requirements with low-latency applications. The deep integration of multi-access technologies and MEC can significantly enhance the access capacity between heterogeneous devices platforms. However, traditional network architecture cannot be directly applied Internet Vehicles (IoV) due high speed mobility inherent characteristics. Furthermore, given large number resource-rich vehicles on road, it is new...

In this paper, a novel dual-band, dual-polarized, miniaturized and low-profile base station antenna operating in the frequency bands of 820-960 1710-2170 MHz is designed. Elements are arranged such that high-frequency elements embedded low to reduce volume. A baffle used reflect transmitted power density forward direction also improve isolation between elements. Therefore, surrounding baffles rectangular appended around low-frequency elements, respectively. The diameter proposed cover only...

Unmanned aerial vehicles (UAVs)-assisted mobile-edge computing (MEC) communication system has recently gained increasing attention. In this article, we investigate a 3-D multi-UAV trajectory optimization based on ground devices (GDs) selecting the target UAV for task computing. Specifically, first design dynamic multi-UAV-assisted MEC in which GDs have real-time mobility and update. Next, formulate communication, computation, flight energy consumption as objective functions fairness among...

The successful realization of smart energy management relies on ubiquitous and reliable information exchange among millions sensors actuators deployed in the field with little or no human intervention. This motivates us to propose a unified communication framework for by exploring integration software-defined networking machine-to-machine communication. In this article, first we provide comprehensive review state-of-the-art contributions from perspective software defined machineto- machine...

To meet the ever increasing demand of mobile data traffic, 5G enabling technologies are proposed in vehicular networks. Network densification is one key for large user throughput and traffic capacity, but there a great challenge to serve numerous neighbors. According observations from real dataset vehicles, we discover neighbor groups (VNGs) consisting VNGs crucial enrich enhance various services networks through efficient management. Therefore, propose 5G-enabled software defined...

Actual vehicle-to-vehicle (V2V) channel measurements have shown that the wide-sense stationary (WSS) modeling assumption is valid only for very short time intervals. This fact motivates us to develop non-WSS V2V models. In this paper, we propose a novel three-dimensional (3D) theoretical regular-shaped geometry-based stochastic model (RS-GBSM) and corresponding sum-of-sinusoids (SoS) simulation non-isotropic scattering wideband multiple-input multiple-output (MIMO) fading channels. The...

Mobile video streaming is fundamental to advanced applications in the fifth generation (5G) networks. Millimeter wave (mmWave) communication represents a leading 5G technology, which provides rich bandwidth and, therefore, great potentials for high-quality mobile streaming. However, mmWave networks faces challenges due antenna directivity and high user mobility. As such, users typically have short connection durations frequent handoffs, making suffer from long handoff delays latency. In this...

The filter bank multicarrier with offset quadrature amplitude modulation (FBMC-OQAM) has attracted increasing attention recently. In this paper, we address the problem of PAPR reduction for FBMC-OQAM systems using Tone Reservation (TR) technique. Due to overlapping structure signals, directly applying TR schemes OFDM is not effective. We improve tone reservation technique by employing sliding window called (SW-TR) proposed SWTR uses peak tones (PRTs) several consecutive data blocks cancel...

Abstract In recent decades, metasurfaces have attracted considerable interest to generate vortex beams, that is, orbital angular momentum (OAM) carrying beams. However, the existing OAM are mostly fixed‐mode or with single function. Here a concept of multifunctional beam generation is proposed, and realized by dynamic reflective metasurface which capable controlling spatiotemporally. The proposed has ability control mode observe rotational Doppler effect. As proof concept, it presented can...

As people pay more attention to environmental protection and energy conservation issues, consumption in communications have become a hot research field. In wireless networks such as sensor networks, traditional battery-operated devices or nodes short lifetime die after the batteries are depleted, replacing may be very costly sometimes will impossible. Therefore, harvesting (EH) good means solve this problem. EH mean can continue working by ambient energy. different from communications, so we...

Due to the rapid development of wireless access technologies and smart terminals, mobile data traffic is continuously increasing, which expected lead an explosive growth in heterogeneous networks especially cellular networks. It significant for network operators expand capacity avoid congestion overload so as guarantee users' satisfaction. Given that contemporary terminals are capable both WiFi networks, offloading envisioned a promising solution utilize various benefits migrate from This...

Mobile edge computing (MEC), which enables delay-sensitive tasks to be executed at network edges, has been proposed accommodate the explosive growth of Internet Things. However, growing demands for massive connectivity, ultra-low latency, and high reliability in various emerging resource-hungry computation-intensive applications pose new challenges access capacity. This motivates us conceive a MEC framework from an air-ground integration perspective. First, we present review state-of-the-art...

Abstract Reactive oxygen species (ROS)‐induced mitophagy is associated with a variety of diseases. Therefore, visualizing and modulating the process ROS‐induced essential for understanding role in cellular homeostasis, physiological processes, pathogenesis. Herein, using fluorescence lifetime imaging microscopy (FLIM), first time complete dynamic PINK1/Parkin pathway‐mediated described. Induced by photo‐controlled release ROS, nitrogen‐doped multi‐functional carbon nanozymes (ENZ‐NCDs) used...

Despite the global development of social enterprises (SEs) over past three decades, how to improve sustainability remains a challenging issue for most SEs. Although SE ecosystems have been recognized as crucial determinants performance in current literature, no empirical study has comprehensively examined relationships among them. Additionally, prior studies demonstrated that might vary SEs different revenue structures or across contexts, suggesting more attention should be devoted...

Recently, filter bank multicarrier (FBMC) modulations have attracted increasing attention. The banks of FBMC are derived from a prototype that determines the system performance, such as stopband attenuation, intersymbol interference (ISI) and interchannel (ICI). In this paper, we formulate problem direct optimization impulse-response coefficients for systems to minimize energy constrain ISI/ICI. Unfortunately, is nonconvex highly nonlinear. Nevertheless, observing all functions in...