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

A communication system, a communicating method and a base station are provided. When a base station generates an FCM, the base station detects the use rate of a transmission buffer and decides how slots of a frame of an uplink channel are structured. When the use rate of the transmission buffer is high, the base station designates the number of ACTSs to 0 so that the base station does not accept registration requests and so forth from mobile stations. When the use rate of the transmission buffer is low, the base station designates the number of ACTSs to 1. When the number of mobile stations is large as in a large convention hall, the base station generates TDMA frames each of which has only ACTSs. The base station can decide the number of ATCSs corresponding to the probability of which registration requests and so forth from mobile stations collide.

Communicating system, communicating method, and base station

This article reports on the technical design and analysis of an interference management protocol that enables interference avoidance among multiple PHY layer designs in the recently completed IEEE 802.15.4g standard for smart utility networking (SUN). The IEEE 802.15.4g system employs three alternate PHY layer designs for enhanced SUN implementation and deployment targeting different market segments. First, SUN is introduced from different perspectives concerning technology, regulation, and the standardization process. Updates on the IEEE 802.15.4g standardization activities, the SUNrelated rules and regulations, and a summary of system design are presented. Next, the interference management protocol for multi-PHY-layer design in a single network is described and discussed. The impact of interference due to coexisting multiple PHY layer designs is highlighted. The operational procedure and mechanism of the management protocol, known as Multi-PHY Management (MPM), are then described. Finally, performance analysis in the presence of MPM is provided and discussed to justify its significance. It is anticipated that in the near future, this interference management approach will be put to field test and then deployed to provide solutions to mitigate interference among different PHY layer designs in SUN.

An interference management protocol for multiple physical layers in IEEE 802.15.4g smart utility networks

For the 5G system and beyond, several new-waveforms with low out-of-band emission (OOBE) have been proposed to improve spectral efficiency. The universal timedomain windowed OFDM (UTW-OFDM) have been proposed as a waveform that has the low OOBE characteristics and high compatibility with the conventional cyclic prefix OFDM (CP-OFDM)-based systems. To indicate the feasibility of the UTW-OFDM-based system in the 5G and beyond, the comprehensive evaluation of the UTW-OFDM-based LTE system is important, however, the evaluation of the UTW-OFDM-based LTE system complexity has been not reported. Furthermore, the communication quality of the UTW-OFDM-based LTE system was evaluated by using BER characteristics on the short delay multipath propagation channel in the previous studies. In this paper, to show the feasibility of the UTW-OFDM for the 5G and beyond, the complexity of the UTW-OFDM-based LTE downlink (DL) system is evaluated and compared with one of the LTE-DL system with the conventional CP-OFDM and the filtering-based waveform (UF-OFDM). The complexity of the conventional CP-OFDM-based system and the UTW-OFDM-based system is about 0.45 % of the complexity of the UF-OFDM-based system. Furthermore, the communication quality of the UTW-OFDM-based LTE-DL system is evaluated by using BLER on the 3GPP Extended Typical Urban (ETU) channel model with the 70 Hz Doppler shift. The UTW-OFDM-based LTE-DL system can improve the OOBE of the conventional CP-OFDM-based LTE-DL system by 45 dB with only 2.0 dB deterioration of EN 0 to achieve BLER = 10−1 even if the 64QAM is applied with a half coding rate.

A comprehensive study of universal time-domain windowed OFDM-based LTE downlink system

Embodiments of the invention enable a large number of wireless communication networks to be efficiently used while the size of a device operated by a user is reduced and power is saved by providing a communication terminal whose connection with different wireless communication networks can be dynamically reconfigured. A communication terminal whose connection with a plurality of wireless communication networks can be dynamically reconfigured is provided with a data communication aggregation device, a communication application executing device, and a local communication path therebetween. The data communication aggregation device interfaces with the plurality of wireless communication networks and communicates with the communication application executing device through the local communication path. The communication application executing device executes an application for communicating with an outside communication network.

Communication terminal and communication network system

This paper presents the performance and coexistence analysis of multiple IEEE 802 wireless communication systems operating in TV White Space (TVWS). Three IEEE 802 groups with systems operating in TVWS, namely IEEE 802.15.4m Low-Rate Wireless Personal Area Network (LR-WPAN), IEEE 802.11af Wireless Local Area Network (WLAN) and IEEE 802.22 Wireless Regional Area Network (WRAN) are investigated. First, system performance and achievable operating range for these systems in the absence of interference are evaluated, in accordance to design parameters suited to targeted application scenarios respectively. Then, assuming operation in close proximity, the three systems in the presence of interference are investigated to assess their error performance and critical distances to interfering device. The results highlighted several insightful critical parameter settings such as interferer-to-victim separation and interferer transmit power, beyond or below which, cause intolerable degradation to victim systems as quantified by the minimum required error rate performance.

Hiroshi Harada

Papers

Communicating system, communicating method, and base station

An interference management protocol for multiple physical layers in IEEE 802.15.4g smart utility networks

A comprehensive study of universal time-domain windowed OFDM-based LTE downlink system

Communication terminal and communication network system

Performance and coexistence analysis of multiple IEEE 802 WPAN/WLAN/WRAN systems operating in TV White Space