The smart grid is conceived of as an electric grid that can deliver electricity in a controlled, smart way from points of generation to active consumers. Demand response (DR), by promoting the interaction and responsiveness of the customers, may offer a broad range of potential benefits on system operation and expansion and on market efficiency. Moreover, by improving the reliability of the power system and, in the long term, lowering peak demand, DR reduces overall plant and capital cost investments and postpones the need for network upgrades. In this paper a survey of DR potentials and benefits in smart grids is presented. Innovative enabling technologies and systems, such as smart meters, energy controllers, communication systems, decisive to facilitate the coordination of efficiency and DR in a smart grid, are described and discussed with reference to real industrial case studies and research projects.

Demand response and smart grids—A survey

This document provides updates to IEEE Std 802.16's MIB for the MAC, PHY and asso- ciated management procedures in order to accommodate recent extensions to the standard.

IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems Draft Amendment: Management Information Base Extensions

With the explosive growth of mobile data demand, the fifth generation (5G) mobile network would exploit the enormous amount of spectrum in the millimeter wave (mmWave) bands to greatly increase communication capacity. There are fundamental differences between mmWave communications and existing other communication systems, in terms of high propagation loss, directivity, and sensitivity to blockage. These characteristics of mmWave communications pose several challenges to fully exploit the potential of mmWave communications, including integrated circuits and system design, interference management, spatial reuse, anti-blockage, and dynamics control. To address these challenges, we carry out a survey of existing solutions and standards, and propose design guidelines in architectures and protocols for mmWave communications. We also discuss the potential applications of mmWave communications in the 5G network, including the small cell access, the cellular access, and the wireless backhaul. Finally, we discuss relevant open research issues including the new physical layer technology, software-defined network architecture, measurements of network state information, efficient control mechanisms, and heterogeneous networking, which should be further investigated to facilitate the deployment of mmWave communication systems in the future 5G networks.

A survey of millimeter wave communications (mmWave) for 5G: opportunities and challenges

Cognitive radio (CR) is the enabling technology for supporting dynamic spectrum access: the policy that addresses the spectrum scarcity problem that is encountered in many countries. Thus, CR is widely regarded as one of the most promising technologies for future wireless communications. To make radios and wireless networks truly cognitive, however, is by no means a simple task, and it requires collaborative effort from various research communities, including communications theory, networking engineering, signal processing, game theory, software-hardware joint design, and reconfigurable antenna and radio-frequency design. In this paper, we provide a systematic overview on CR networking and communications by looking at the key functions of the physical (PHY), medium access control (MAC), and network layers involved in a CR design and how these layers are crossly related. In particular, for the PHY layer, we will address signal processing techniques for spectrum sensing, cooperative spectrum sensing, and transceiver design for cognitive spectrum access. For the MAC layer, we review sensing scheduling schemes, sensing-access tradeoff design, spectrum-aware access MAC, and CR MAC protocols. In the network layer, cognitive radio network (CRN) tomography, spectrum-aware routing, and quality-of-service (QoS) control will be addressed. Emerging CRNs that are actively developed by various standardization committees and spectrum-sharing economics will also be reviewed. Finally, we point out several open questions and challenges that are related to the CRN design.

Cognitive radio networking and communications: an overview

Millimeter wave (mmWave) communications have recently attracted large research interest, since the huge available bandwidth can potentially lead to the rates of multiple gigabit per second per user Though mmWave can be readily used in stationary scenarios, such as indoor hotspots or backhaul, it is challenging to use mmWave in mobile networks, where the transmitting/receiving nodes may be moving, channels may have a complicated structure, and the coordination among multiple nodes is difficult To fully exploit the high potential rates of mmWave in mobile networks, lots of technical problems must be addressed This paper presents a comprehensive survey of mmWave communications for future mobile networks (5G and beyond) We first summarize the recent channel measurement campaigns and modeling results Then, we discuss in detail recent progresses in multiple input multiple output transceiver design for mmWave communications After that, we provide an overview of the solution for multiple access and backhauling, followed by the analysis of coverage and connectivity Finally, the progresses in the standardization and deployment of mmWave for mobile networks are discussed

Millimeter Wave Communications for Future Mobile Networks

Improvement of out-of-band characteristics for a bandpass filter (BPF) using /spl lambda//2 microstrip line (MSL) resonators is carried out. The basic operations of a tapped /spl lambda//2 resonator are examined theoretically and experimentally. The application to MSL resonator BPF with improved spurious responses are also examined. An extended 2-pole BPF with improved skirt characteristics and target spurious response is proposed and realized. It is confirmed that the present concept is great useful for improving out-of-band characteristics of the /spl lambda//2 resonator BPFs.

A method for improving out-of-band characteristics of /spl lambda//2 microstrip line resonator bandpass filters

The wireless smart ubiquitous network field area network (Wi-SUN FAN), a wireless communication standard for Internet of Things (IoT) applications, such as smart metering and monitoring, has been attracting attention. Conventionally, the information transmitted by the Wi-SUN FAN is numerical values and/or character strings, such as metering information. It has been thought that the Wi-SUN FAN cannot transmit video images because the data rate is at most in hundreds of kbps. However, owing to improvements in video compression and transmission technologies in recent years, video images can be transmitted at a transmission rate of hundreds of kbps. In this study, the feasibility of video transmission over the Wi-SUN FAN is evaluated using low-rate video compression and transmission technology. First, several network topologies for video transmission by the current Wi-SUN FAN with multi-hop are evaluated by computer simulations. Consequently, adequate numbers of nodes and multi-hops in the Wi-SUN FAN are recommended. Subsequently, using a recommended value, an experimental system is configured and the video transmission performance over the Wi-SUN FAN is evaluated experimentally.

Video Transmission Trial by Wireless Multi-hop Network based on Wi-SUN FAN

This paper proposes an effective and low-energy multi-hop data collection scheme using a superframe division technique with frame aggregation in the wireless smart utility networks (SUNs). In the proposed scheme, MAC layer profile deploying IEEE 802.15.4/4e-compliant low-energy (LE) superframe-based multi-hop transmission mitigates the bottleneck problem by controlling the radio link numbers in a superframe, thereby preventing the data collection throughput degradation expected in high-traffic situations such as emergencies. Computer simulation results confirm that the proposed superframe division multi-hop data collection scheme with frame aggregation achieves over a 95% frame success probability under the high-traffic situation in which 1,000 meter nodes generate frames at a 10-minute interval.

Low-energy and multi-hop enhancement in wireless smart utility networks

Kommunikationssystem
fur eine Kommunikation
mit einem mobilen Endgerat
(90), mit: einer Breitbereichszellen-Basisstation (10) zum
Ausfuhren einer
Kommunikation mit dem mobilen Endgerat (90) in einer Breitbereichszelle
(M); einer Mehrzahl von Schmalbereichszellen-Basisstationen (20)
zum Ausfuhren
von Kommunikationen mit dem mobilen Endgerat (90) in einer Mehrzahl von
in der Breitbereichszelle (M) enthaltenen Schmalbereichszellen (SP); und einer
integrierten Basisstation (30) zum Ausfuhren von Kommunikationen mit
der Breitbereichszellen-Basisstation (10) und den Schmalbereichszellen-Basisstationen
(20), dadurch gekennzeichnet, das die Schmalbereichszellen-Basisstationen
(20) Einwegkommunikationen mit dem mobilen Endgerat (90) ausfuhren.

Kommunikationssystem, Kommunikationsverfahren und mobiles Endgerät

The improvement of spurious responses of a λ/4 resonator bandpass filter (BPF) using a microstrip line (MSL) is carried out. Firstly, a basic mechanism for improving the resonance responses of the λ/4 resonator, under the condition that the excitation method is changed, is presented. Secondly, on the basis of the above proposal, the BPF is demonstrated as an example. It is confirmed that the λ/4 resonator using the tap-coupling technique can improve the spurious responses of the BPF using λ/4 resonators. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 311–314, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11200

Hiroshi Harada

Papers

A method for improving out-of-band characteristics of /spl lambda//2 microstrip line resonator bandpass filters

Video Transmission Trial by Wireless Multi-hop Network based on Wi-SUN FAN

Low-energy and multi-hop enhancement in wireless smart utility networks

Kommunikationssystem, Kommunikationsverfahren und mobiles Endgerät

Improved spurious responses of a BPF using λ/4 MSL resonators with the tap‐coupling technique