Exploiting the unlicensed spectrum is considered by 3GPP as one promising solution to meet ever-increasing traffic growth. As a result, major enhancement for LTE in Release 13 has been enable its operation via licensed-assisted access (LAA). In this article, we provide an overview of LAA technology including motivation, use cases, enhancements enabling band operation, and coexistence evaluation results contributed participants.

The 3GPP is in the process of developing next generation radio access technology, named New Radio (NR), which will be proposed as a candidate technology for IMT-2020. This article outlines wide bandwidth operation NR, among other new features being considered, based on up-to-date discussions and decisions made standardization meetings. much wider channel compared to LTE, enables more efficient use resources than existing carrier aggregation framework with lower control overhead. support...

This paper considers the scenario in which a set of nodes share common channel. Some have rechargeable battery and others are plugged to reliable power supply and, thus, no energy limitations. We consider two source-destination pairs apply concept cognitive radio communication sharing Specifically, we give high-priority energy-constrained pair, i.e., primary low-priority pair is free from such constraint, secondary pair. In contrast traditional notion radio, transmitter required relinquish...

We consider the adoption of listen-before-talk (LBT) for Long Term Evolution (LTE) in unlicensed spectrum, which is currently under discussion 3rd Generation Partnership Project (3GPP). The first and foremost task to be done allow LTE use spectrum study coexistence with incumbent system, such as Wireless Local Area Network (WLAN). In our study, we observe that a proper mechanism imperative especially when both Evolved Node Bs (eNBs) WLANs are located outdoor. outdoor deployment scenario...

The Long Term Evolution (LTE) in unlicensed spectrum is an emerging topic the 3rd Generation Partnership Project (3GPP), which about operation of LTE system via license-assisted carrier aggregation. 5 GHz Unlicensed National Information Infrastructure (U-NII) bands are currently under consideration, but these also occupied by Wireless Local Area Networks (WLAN), specifically those based on IEEE 802.11a/n/ac technologies. Therefore, appropriate coexistence mechanism must be augmented to...

As the pace of global 5G network deployments accelerates, now is moment for cellular industry to realize 6G communication. In this article, modular massive multiple-in-put multiple-output (mmMIMO) presented as one candidate technology improve spectral efficiency in low-frequency bands. The New Radio pushed boundary system's operating frequency high-frequen-cy bands, and trend will continue era. However, technical advances bands fall short, although are crucial serving a large number users...

In this paper, we consider the random access of nodes having energy harvesting capability and a battery to store harvested energy. Each node attempts transmit head-of-line packet in queue if its is nonempty. The arrivals into are all modeled as discrete-time stochastic process. main contribution paper exact characterization stability region queues given rates for two-node slotted ALOHA system. By stability, refer ability system keep bounded region, or more precisely, existence limiting...

In this paper, we consider the random access of nodes having energy harvesting capability and a battery to store harvested energy. Each node attempts transmit head-of-line packet in queue if its is nonempty. The arrivals into are all modeled as discrete-time stochastic process. main contribution paper exact characterization stability region queues given rates when pair randomly accessing common channel multipacket reception (MPR) capability. with MPR generalized form wireless modeling which...

In this paper, we consider the operation of Long Term Evolution (LTE) systems in unlicensed spectrum. Given lack exclusive use spectrum, band is fundamentally limited by interference from other technologies using same frequency band. By noting that spectrum heavily used Wireless Local Area Networks (WLAN), here focus on mutual effect between LTE and WLAN when they coexist. For this, developed a novel inter-system analysis technique based continuum field approximation spiral representation,...

Current trends in spectrum regulation show that more and unlicensed shared bands are poised to be opened up for mobile communication. However, the question remains how best utilize this build efficient networks, if time has come newer approaches considered next generation system. In work, we propose a coordinated framework can cellular standardization. designing framework, aim improve upon current access schemes toward increasing spectral efficiency highly-dense networks. To end, demonstrate...

In this paper, we evaluate the benefits of using one user a two-user random access system to relay traffic other user.

In this paper, the impact of energy constraints on a two-hop network with source, relay and destination under random medium access is studied. A collision channel erasures considered, source nodes have harvesting capabilities an unlimited battery to store harvested energy. Additionally, node external traffic arrivals forwards fraction node's destination; cooperation performed at level. An inner outer bound stability region for given transmission probability vector are obtained. Then, closure...

We consider the problem of resource sharing in Device-to-Device (D2D) communication underlaying cellular networks. The is formulated as a non-cooperative game which mobile users, either legacy users or D2D decide their respective transmission power over available blocks (RBs) with goal maximizing own utility function. key factor that distinguishes our work from existing literature design function; function each user defined achievable rate normalized by consumption, [bits/sec/Joule]. Such...

This paper considers the scenario in which a set of nodes share common channel. Some have rechargeable battery and others are plugged to reliable power supply and, thus, no energy limitations. We consider two source-destination pairs apply concept cognitive radio communication sharing Specifically, we give high-priority energy-constrained pair, i.e., primary low-priority pair is free from such constraint, secondary pair. In contrast traditional notion radio, transmitter required relinquish...

In this paper, we study the stability property of a cognitive radio system comprised set source-destination pairs having different priorities. particular, focus attention on effect imperfect sensing region system, which has been overlooked in most related previous work. The adopted access protocol allows secondary user not only to exploit idle slots primary but also transmit along with some probability. This is aimed at achieving full utilization shared channel capture, i.e., transmission...

In multiple-input multiple-output (MIMO) systems, the high-resolution channel information (CSI) is required at base station (BS) to ensure optimal performance, especially in case of multi-user MIMO (MU-MIMO) systems. absence reciprocity frequency division duplex (FDD) user needs send CSI BS. Often large overhead associated with this feedback FDD systems becomes bottleneck improving system performance. paper, we propose an AI-based based on auto-encoder architecture that encodes UE into a...

Accurate Channel State Information (CSI) is critical for maximizing the throughput of massive Multi-Input Multi-Output (mMIMO) systems. Due to environment dynamics and user mobility, CSI aging a major challenge achieving large mMIMO promised by theory. prediction can be used overcome this without increasing signaling overhead. Motivated anticipated native support Artificial Intelligence (AI) in fifth generation beyond cellular standards, we propose deep learning solutions based on...

Feedback reduction in multiuser orthogonal frequency-division multiplexing (OFDM) systems has become an important issue due to the excessive amount of feedback required use opportunistic scheduling, particularly when number users and carriers is large. In this paper, we propose a novel feedback-reduction scheme for efficient downlink scheduling. proposed scheme, each user determines based on so-called <i xmlns:mml="http://www.w3.org/1998/Math/MathML"...

In this work, we study the benefit of partial relay cooperation. We consider a two-node system consisting one source and node transmitting information to common destination. The have external traffic in addition, is equipped with flow controller regulate incoming from node. cooperation performed at network level. A collision channel erasures considered. provide an exact characterization stability region also prove that always better or least equal without controller.

As the need for limitless connectivity surges, non-terrestrial networks (NTN) will play a central role in fifth generation (5G) and beyond communications. The 3rd Gener-ation Partnership Project (3GPP) defines NTN as networks, or segments of using an airborne space-borne vehicle relay node base station. An NTN-enhanced cellular network supplements conventional terrestrial network. This article provides overview with particular focus on satellite-mobile direct First, we review satellite...

In randomly deployed networks, such as sensor an important problem for each node is to discover its neighbor nodes so that the connectivity amongst can be established. this paper, we consider by incorporating physical layer parameters in contrast most of previous work which assumes collision channel. Specifically, pilot signals transmit are successfully decoded if strength received signal relative interference sufficiently high. Thus, must extract parameter information from unknown number...

In randomly deployed networks, such as sensor an important problem for each node is to discover its neighbor nodes so that the connectivity amongst can be established. this paper, we consider by incorporating physical layer parameters in contrast most of previous work which assumed a collision channel. Specifically, pilot signals transmit are successfully decoded if strength received signal relative interference sufficiently high. Thus, must extract parameter information from superposition...

In this work, we consider the device-to-device (D2D) communications underlaying cellular networks to support local communication needs. particular, focus our attention on design of an optimal resource allocation and mode selection algorithm for both D2D users. design, users is also taken into account so that a source-destination pair has option either directly communicate or indirectly through base station (BS). On other hand, it necessary important provide certain level Quality Service...

Massive multiple-input multiple-output (MIMO) system is promising in providing unprecedentedly high data rate. To achieve its full potential, the transceiver needs complete channel state information (CSI) to perform transmit/receive precoding/combining. This requirement, however, challenging practical systems due unavoidable processing and feedback delays, which oftentimes degrades performance a great extent, especially mobility scenarios. In this paper, we develop deep learning based...

In this work, we consider the device-to-device (D2D) communications underlaying cellular networks to support local communication needs. particular, focus our attention on design of an optimal resource allocation and mode selection algorithm for both D2D users. design, users is also taken into account so that a source-destination pair has option either directly communicate or indirectly through base station (BS). On other hand, it necessary important provide certain level Quality Service...