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

IEEE 802.15.4/4e準拠無線スマートユーティリティネットワーク用低消費電力MACプロトコルF-RITの実装・評価

The device has a receiver stage, a stage for estimating the transmission path characteristic, a distortion correction stage using the characteristic, a demodulation stage and a modulation stage. The estimating stage compares part of the received signal corresponding to a known signal with the signal resulting from modulating the known signal and compares a data signal part with part of the modulated signal corresponding to a data signal. The device has a receiver stage that receives a signal transmitted as the result of modulating a signal containing a known signal and a data signal, a stage for estimating the transmission path characteristic, a distortion correction stage using the characteristic, a demodulation stage and a modulation stage. The estimating stage compares part of the received signal corresponding to the known signal with the signal resulting from modulating the known signal and compares the data signal part with part of the modulated signal corresponding to the data signal. Independent claims are also included for the following: a method of receiving a data signal and an information recording medium that can be read by a computer containing a program.

Data signal receiver compares parts of received signal corresponding to known and data signals with modulated known signal and modulated data signal parts to derive path characteristic

Efficiency of communication to a root device is improved. A broadcast hello packet including a hierarchical number is received; the hello packets of one or more devices are collected and an own-device-hierarchical-number is set to a value by adding one to the smallest number of the hierarchical numbers; each device having a hierarchical number smaller than the own-device-hierarchical-number by one is retained as a parent device; each device having the same hierarchical number as the own-device-hierarchical-number is retained as a sibling device; each device having a hierarchical number larger than the own-device-hierarchical-number by one or more is retained as a child device; an indication of the retaining as the parent device, as the sibling device, and as the child device are each transmitted so as to reach the parent device, the sibling device, and the child device; and a hello packet including the own-device hierarchical number is broadcast.

Communication device and communication method for communication to a root device

An in-depth yet simple analysis is presented for binary direct sequence code division multiple access (DS-CDMA) systems considering a frequency selective Nakagami fading channel and maximal ratio combining (MRC) receiver. The inevitable inter-symbol interference as well as multiple access interference from simultaneous users are modeled elegantly and their characteristic functions (CF) are developed. Utilizing the CFs, the exact bit error probabilities are developed following the CF method of error rate analysis that claims the honor to be the first-to-publish reliable result for such channel and receiver. The CF based exact error rate is less computationally intensive than that can be obtained by traditional methods of approximation. The same method also lets us develop a new simpler approximate error rate. The exact method is utilized to investigate the range of parameters where approximations (existing and the new) would be accurate.

On Error Probabilities for DS-CDMA/MRC in Frequency Selective Nakagami Fading

For the beyond 5G and future wireless communication systems, a variety of new-waveforms have been proposed to support emerging new use cases. The generalized frequency division multiplexing (GFDM) is attracting attention as one of the new-waveforms because the GFDM can flexibly change the number of subcarriers and symbols in both of frequency and time domains, while the out-of-band emission (OOBE) is almost same as that of the conventional CP-OFDM and the CP-DFTs-OFDM. Furthermore, many researches of the GFDM were evaluated with only AWGN or the condition of ideal channel estimation. To evaluate the practicality of the GFDM, effects of the channel estimation error should be considered. In this paper, we proposed a universal time-domain windowed GFDM (UTW-GFDM) that can improve OOBE significantly with low additional complexity and apply it to the LTE uplink system. The practicality of the proposed UTW-GFDM is shown by evaluating OOBE, PAPR, and BLER comprehensively under the 3GPP defined Extended Typical Urban (ETU) channel model. The proposed UTW-GFDM improves the OOBE reduction at channel-edge by 52.7 dB with a slight deterioration of less than 1.0 dB in PAPR and SNR to achieve BLER of 10–3 compared to the conventional GFDM when QPSK is applied. Even in the case of 64QAM, the UTW-GFDM improves the OOBE reduction at channel-edge by up to 13.7 dB when 2.0 dB deterioration is acceptable for the SNR to achieve BLER = 10–3.

Hiroshi Harada

Papers

IEEE 802.15.4/4e準拠無線スマートユーティリティネットワーク用低消費電力MACプロトコルF-RITの実装・評価

Data signal receiver compares parts of received signal corresponding to known and data signals with modulated known signal and modulated data signal parts to derive path characteristic

Communication device and communication method for communication to a root device

On Error Probabilities for DS-CDMA/MRC in Frequency Selective Nakagami Fading

Performance Evaluation of Universal Time-domain Windowed GFDM-based LTE Uplink