Providing connectivity to unmanned aerial vehicle-user equipment (UAV-UE), such as drones or flying taxis, is a major challenge for tomorrow's cellular systems. In this paper, the use of coordinated multi-point (CoMP) transmission providing seamless UAV-UEs investigated. particular, network clustered ground base stations (BSs) that cooperatively serve number considered. Two scenarios are studied: with static, hovering and mobile UAV-UEs. Under maximum ratio transmission, novel framework...

Proactive wireless caching and device to (D2D) communication have emerged as promising techniques for enhancing users' quality of service network performance. In this paper, we propose a new architecture D2D with inter-cluster cooperation. We study cellular in which users cache popular files share them other either their proximity via or remote using transmission. characterize the average delay per request from queuing perspective. Specifically, formulate minimization problem show that it is...

Guaranteeing ultra reliable low latency communications (URLLC) with high data rates for virtual reality (VR) services is a key challenge to enable dual VR perception: visual and haptic. In this paper, terahertz (THz) cellular network considered provide high-rate services, thus enabling successful perception. For network, guaranteeing URLLC requires overcoming the uncertainty stemming from THz channel. To end, achievable reliability of over links are characterized. particular, novel...

Providing connectivity to aerial users (AUs) such as cellular-connected unmanned vehicles (UAVs) is a key challenge for tomorrow's cellular systems. In this letter, the use of conjugate beamforming (CB) simultaneous content delivery an AU co-existing with multiple ground (GUs) investigated. particular, network uniformly distributed massive multiple-input multiple-output (MIMO)-enabled base stations (BSs) serving both and through spatial multiplexing considered. For model, successful...

Providing seamless connectivity to unmanned aerial vehicle user equipment (UAV-UE) is very challenging due the encountered line-of-sight interference and reduced gains of down-tilted base station (BS) antennas. For instance, as altitude UAV-UEs increases, their cell association handover procedure become driven by side-lobes BS In this paper, performance cellular-connected studied under 3D practical antenna configurations. Two scenarios are studied: with static, hovering mobile UAV-UEs. both...

Providing connectivity to aerial users, such as cellular-connected unmanned vehicles (UAVs) or flying taxis, is a key challenge for tomorrow's cellular systems. In this paper, the use of coordinated multi-point (CoMP) transmission along with caching providing seamless users investigated. particular, network clustered cache-enabled small base stations (SBSs) serving considered in which requested content by an user cooperatively transmitted from collaborative ground SBSs. For network, novel...

An energy-trading system is essential for the successful integration of Electric vehicles (EVs) into smart grid. Existing systems merely focus on making optimal decisions while others depend anonymization to achieve EVs drivers' privacy which not enough because they can be identified from visited locations. In this paper, leveraging blockchain technology, we propose a privacy-preserving charging-station-to-vehicle (CS2V) energy trading scheme. To preserve privacy, are anonymous, however,...

Background: Intracorneal ring segment (ICRS) implantation is a promising and effective treatment option for keratoconus. However, corneal thickness of less than 400 microns presents unique challenge. This study assessed the clinical course visual outcomes in patients with Amsler–Krumeich stage 2 or greater keratoconus clear corneas, minimal stromal 350 but proposed area, up to 6 months after ICRS implantation. Methods: non-randomized, prospective, interventional case series was conducted at...

Unmanned Aerial Vehicles (UAVs) are emerging as important users of next-generation cellular networks. By operating in the sky, UAV experience very different radio conditions than terrestrial users, due to factors such strong Line-of-Sight (LoS) channels (and interference) and Base Station (BS) antenna misalignment. As a consequence, UAVs may significant degradation their received quality service, particularly when they moving subject frequent handovers. The solution is allow be aware its...

We formulate and solve the energy minimization problem for a clustered device-to-device (D2D) network with cache-enabled mobile devices. Devices are distributed according to Poisson cluster process (PCP) assumed have surplus memory which is exploited proactively cache files from library. can retrieve requested their caches, neighboring devices in proximity (cluster), or base station as last resort. minimize consumption of proposed under random probabilistic caching scheme, where...

In this paper, we aim at maximizing the offloading gain for a clustered cache-enabled device-to-device (D2D) network whose devices adopt probabilistic caching and cooperative transmission. Devices with surplus memory probabilistically cache content from known library. A requested is either brought device's local cache, cooperatively transmitted catering devices, or downloaded network. For network, derive closed-form expression formulate maximization problem. order to simplify objective...

Caching at mobile devices and leveraging device-to-device (D2D) communication are two promising approaches to support massive content delivery over wireless networks. The analysis of cache-enabled networks is usually carried out by assuming that uniformly distributed, however, in social networks, intrinsically grouped into disjoint clusters. In this regards, paper proposes a spatiotemporal mathematical model tracks the service requests arrivals account for clustered geometry. Two kinds...

Proactive wireless caching and D2D communication have emerged as promising techniques for enhancing users' quality of service network performance. In this paper, we propose a new architecture with inter- cluster cooperation. We study cellular in which users cache popular files share them other either their proximity via or remote using transmission. characterize the average delay per request from queuing perspective. Specifically, formulate minimization problem show that it is NP-hard....

Fifth Generation (5G) cellular networks are expected to provide connectivity for vehicular users, including Unmanned Aerial Vehicles (UAVs). When flying in the air, these users experience strong, unobstructed channel conditions a large number of Base Stations (BSs) on ground. This creates very strong interference UAV while at same time offering them BSs potentially associate with service. Therefore, maximise performance UAV-BS wireless link, user needs be able choose which connect to, based...

Providing reliable connectivity to cellular-connected Unmanned Aerial Vehicles (UAVs) can be very challenging; their performance highly depends on the nature of surrounding environment, such as density and heights ground Base Stations (BSs). On other hand, tall buildings might block undesired interference signals from BSs, thereby improving between UAVs serving BSs. To address in environments, this paper proposes a Reinforcement Learning (RL) algorithm dynamically optimise height UAV it...

The smart grid was introduced as an evolved version of the traditional power to enable two-way communication between consumers and electricity providers. It aims distribute energy generation points that utilize renewable trading among users. However, this has increasing number components, including consumers, prosumers, plants, electric vehicles. Managing them using a centralized architecture approach introduces several challenges such single failure cyberattacks. To address issue,...

In this paper, we propose a technique for cooperation and underlay mode selection in cognitive radio networks. Hybrid spectrum sharing is assumed where the secondary user (SU) can access primary (PU) channel two modes, or cooperative with admission control. Overlay allows SU to occupy only when PU idle. Cooperation (collaboration) occurs admits PU's packet into relay buffer transmit subsequent timeslots, i.e. timeslots no successful transmission from source destination. addition accessing...

Background: Phakic intraocular lenses (pIOLs) have proven to be excellent substitutes for excimer laser keratorefractive surgery in certain situations. We aimed assess the efficacy and safety of two pIOLs, implantable collamer lens (ICL V4c) versus phakic contact (IPCL V2), myopic correction.
 Methods: In this prospective randomized clinical trial, we allocated eligible eyes with myopia > - 6 diopters into IPCL or ICL implantation groups, each including 100 individuals. Preoperative...

Caching at mobile devices and leveraging device-to-device (D2D) communication are two promising approaches to support massive content delivery over wireless networks. The analysis of such D2D caching networks based on a physical interference model is usually carried out by assuming that uniformly distributed. However, this approach does not fully consider characterize the fact grouped into clusters. Motivated fact, paper presents comprehensive performance joint optimization for clustered...

Caching at mobile devices and leveraging cooperative device-to-device (D2D) communications are two promising approaches to support massive content delivery over wireless networks while mitigating the effects of interference. To show impact communication on performance cache-enabled D2D networks, notion device clustering must be factored in convey a realistic description network performance. In this regard, paper develops novel mathematical model, based stochastic geometry an optimization...

This paper deals with stability analysis for cognitive cooperative system composed of one primary user and many secondary users energy harvesting imposed at both users. Secondary are grouped in a cluster supervision block (CSB) controller which controls synchronizes all the activities SU cluster. The is equipped common relay queue collaboration PU. Multiple SUs cooperate PU its data transmission, getting mutual benefits users, such that, exploits SUs' power diversity provided by multi-SU to...

This paper investigates the maximum stable throughput of a cooperative cognitive radio system with energy harvesting Primary user (PU) and Secondary (SU). Each PU SU has data queue for storage battery storage. These batteries harvest from environment store it transmission in next time slots. The is allowed to access channel only when idle. cooperates its transmission, getting mutual benefits both users, such that, exploits power relay fraction undelivered packets, gets more opportunities...