Millimeter wave (mmWave) communications have recently attracted large research interest, since the huge available bandwidth can potentially lead to rates of multiple gigabit per second user. Though mmWave be readily used in stationary scenarios, such as indoor hotspots or backhaul, it is challenging use mobile networks, where transmitting/receiving nodes may moving, channels a complicated structure, and coordination among difficult. To fully exploit high potential lots technical problems...

This paper investigates the performance of practical physical-layer network coding (PNC) schemes for two-way relay channels. We first consider a consisting two source nodes and single node, which is used to aid communication between nodes. For this scenario, we investigate transmission over two, three or four time slots. show that slot PNC scheme offers higher maximum sum-rate, but lower sum-bit error rate (BER) than number scenarios. also good compromise schemes, achieves best sum-rate...

Reconfigurable intelligent surfaces (RISs) have drawn considerable attention from the research community recently. RISs create favorable propagation conditions by controlling phase shifts of reflected waves at surface, thereby enhancing wireless transmissions. In this paper, we study a downlink multi-user system where transmission multi-antenna base station (BS) to various users is achieved an RIS reflecting incident signals BS towards users. Unlike most existing works, consider practical...

In this paper, we consider a wireless-powered cooperative communication network consisting of one hybrid access-point (AP), source, and relay. contrast to conventional networks, the source relay in considered have no embedded energy supply. They need rely on harvested from signals broadcasted by AP for their information transmission. Based three-node reference model, propose harvest-then-cooperate (HTC) protocol, which harvest downlink work cooperatively uplink source's Considering...

This article reviews state of the art channel coding techniques for URLLC. The stringent requirements URLLC services, such as ultrahigh reliability and low latency, have made it most challenging feature 5G mobile networks. problem is even more services beyond promise, tele-surgery factory automation, which require latencies less than 1ms packet error rates 10-9. provides an overview compares them in terms performance complexity. Several important research directions are identified discussed detail.

Fifth-generation cellular mobile networks are expected to support mission critical URLLC services in addition enhanced broadband applications. This article first introduces three emerging applications of and identifies their requirements on end-to-end latency reliability. We then investigate the various sources delay current wireless by taking 4G LTE as an example. Then we propose evaluate several techniques reduce from perspectives error control coding, signal processing, radio resource...

As one of the key communication scenarios in fifth-generation and also sixth-generation (6G) mobile networks, ultrareliable low-latency communications (URLLCs) will be central for development various emerging mission-critical applications. State-of-the-art systems do not fulfill end-to-end delay overall reliability requirements URLLCs. In particular, a holistic framework that takes into account latency, reliability, availability, scalability, decision-making under uncertainty is lacking....

In this paper, we study the resource allocation and user scheduling problem for a downlink non-orthogonal multiple access network where base station allocates spectrum power resources to set of users. We aim jointly optimize sub-channel assignment maximize weighted total sum-rate while taking into account fairness. formulate as equivalent many-to-many two-sided user-subchannel matching game in which users sub-channels are considered two sets players pursuing their own interests. then propose...

Data aggregation is an essential operation in wireless sensor network applications. This paper focuses on the data scheduling problem. Based maximal independent sets, a distributed algorithm to generate collision-free schedule for networks proposed. The time latency of generated by proposed minimized using greedy strategy. bound 24D + 6 Delta 16, where D diameter and maximum node degree. previous with least has (Delta- 1)R, R radius. Thus our contributes additive factor instead...

With the formidable growth of various booming wireless communication services that require ever increasing data throughputs, conventional microwave band below 10 GHz, which is currently used by almost all mobile systems, going to reach its saturation point within just a few years. Therefore, attention radio system designers has been pushed toward higher segments frequency spectrum in quest for increased capacity. In this article we investigate feasibility, advantages, and challenges future...

In this paper, we propose a terrestrial-satellite network (TSN) architecture to integrate the ultra-dense low earth orbit (LEO) networks and terrestrial achieve efficient data offloading. TSN, each ground user can access over C-band via macro cell, traditional small or LEO-backhauled cell (LSC). Each LSC is then scheduled upload received multiple satellites Ka-band. We aim maximize sum rate number of accessed users while satisfying varying backhaul capacity constraints jointly determined by...

In this paper, we consider a mobile edge computing system with both ultra-reliable and low-latency communications services delay tolerant services. We aim to minimize the normalized energy consumption, defined as consumption per bit, by optimizing user association, resource allocation, offloading probabilities subject quality-of-service requirements. The association is managed mobility management entity (MME), while allocation are determined each access point (AP). propose deep learning (DL)...

To support the explosive growth of wireless devices and applications, various access techniques need to be developed for future systems provide reliable data services in vast areas. With recent significant advances ultra-dense low Earth orbit (LEO) satellite constellations, networks (SANs) have shown their potential integrate with 5G beyond ubiquitous global access. In this article, we propose an enabling network architecture dense LEO-SANs which terrestrial communications are integrated...

In this paper, we propose a secure unmanned aerial vehicle (UAV) mobile edge computing (MEC) system where multiple ground users offload large tasks to nearby legitimate UAV in the presence of eavesdropping UAVs with imperfect locations. To enhance security, jamming signals are transmitted from both full-duplex and non-offloading users. For system, design low-complexity iterative algorithm maximize minimum secrecy capacity subject latency, offloading total power constraints. Specifically,...

In this paper, we investigate a practical demand side management scenario where the selfish consumers compete to minimize their individual energy cost through scheduling future consumption profiles. We propose an instantaneous load billing scheme effectively convince shift peak-time and fairly charge for consumption. For considered DSM scenario, aggregative game is first formulated model strategic behaviors of consumers. By resorting variational inequality theory, analyze conditions...

Interference is traditionally viewed as a performance limiting factor in wireless communication systems, which to be minimized or mitigated. Nevertheless, recent line of work has shown that by manipulating the interfering signals such they add up constructively at receiver side, known interference can made beneficial and further improve system variety scenarios, achieved symbol-level precoding (SLP). This paper aims provide tutorial on exploitation techniques from perspective design...

In this paper, we aim to find the global optimal resource allocation for ultra-reliable and low-latency communications (URLLC), where blocklength of channel codes is short. The achievable rate in short regime neither convex nor concave bandwidth transmit power. Thus, a non-convex constraint inevitable optimizing URLLC. We first consider general problem with constraints on transmission delay decoding error probability, prove that solution can be found subset original feasible region. Then,...

In this paper, we study the user pairing in a downlink non-orthogonal multiple access (NOMA) network, where base station allocates power to pairwise users within cluster. considered NOMA with poor channel condition is paired good condition, when both their rate requirements are satisfied. Specifically, quality of service for weak can be guaranteed, since transmit allocated strong constrained following concept cognitive radio. A distributed matching algorithm proposed aiming optimize and...

In this paper, we consider simultaneous wireless information and power transfer (SWIPT) in relay interference channels, where multiple source-destination pairs communicate through their dedicated energy harvesting relays. Each needs to split its received signal from sources into two streams: one for forwarding the other harvesting. We develop a distributed splitting framework using game theory derive profile of ratios all relays that can achieve good network-wide performance. Specifically,...

This letter investigates the performance of non-orthogonal multiple access (NOMA) in short-packet communications. We aim to answer a fundamental question-for given reliability requirements users: how much physical-layer transmission latency can NOMA reduce when compared with orthogonal finite blocklength regime? derive closed-form expressions for block error rates users NOMA. Further, we obtain near-optimal power allocation coefficients and ensure certain reliability. Numerical results...

We consider an Internet of Things (IoT) monitoring system, in which IoT device monitors a physical process and transmits randomly generated status updates to its associated access point (AP) as timely possible. The timeliness the is characterized by recently introduced metric, termed age information (AoI), defined time elapsed since generation last successfully received update. channel between AP considered be error-prone thus suffer from packet loss. Assuming that provides no feedback...

Using radio-frequency (RF) sensing techniques for human posture recognition has attracted growing interest due to its advantages of pervasiveness, contact-free observation, and privacy protection. Conventional RF are constrained by their radio environments, which limit the number transmission channels carry multi-dimensional information about postures. Instead passively adapting environment, in this paper, we design an system based on reconfigurable intelligent surfaces (RISs). The proposed...