Abstract In the future vision of society, wireless communications will play a more critical role in every aspects of our lives, because the advent of the Internet of Things (IoT) is expanding the application of wireless technology beyond human usage such as mobile or smartphones to thing usage such as industrial applications. It is therefore essential to develop efficient wireless technologies for the wide variety of frequency bands availableˇ˝from the efficient use of conventional bands to the use of pioneering EHF (extremely high frequency) bands (millimeter wave band). This article introduces such development efforts in three areas: 5G (fifth-generation mobile communications systems), wireless LAN (local area network), and wireless access for IoT.
Abstract There is growing interest worldwide in the introduction of fifth-generation mobile communications systems (5G) by 2020 or earlier, and extensive efforts on 5G field experiments are being vigorously carried out in many countries and regions. 3GPP (3rd Generation Partnership Project), the standards organization for mobile communications systems, held the RAN (radio access network) Workshop on 5G in September 2015. Subsequently, discussions started on the standardization of new radio interfaces for 5G. This article outlines the approaches and the current status of standardization towards the introduction of 5G in 2020.
Abstract At NTT Access Network Service Systems Laboratories, we are researching and developing wireless local area network (LAN) technology, which is becoming more popular in homes, businesses, and public spaces. This article introduces standardization trends in wireless LAN technology, cooperative wireless LAN technology that solves interference issues in high-density wireless LAN environments such as stadiums, and integration of wireless LAN with cellular networks to realize 5G, the fifth-generation mobile communications system.
Abstract The Internet of Things (IoT), in which everything is connected to the Internet, has recently been attracting a lot of attention. NTT has been undertaking various initiatives such as research and development and field trials to realize IoT services. This article describes the requirements of IoT/M2M (machine-to-machine) services and outlines the low power wide area (LPWA) network. It also introduces a field trial utilizing the LPWA network implemented by NTT WEST and a wide-area and high-capacity radio relay system developed by NTT.
Abstract The wireless access network for the Internet of Things must offer ultra-broadband communication in order to transfer broadband data such as video data to be displayed for user assistance. High-reliability and low-latency communication is also necessary to remotely and automatically control the instruments of vehicles and robots in real time. This article describes our study on wireless technologies designed to achieve ultra-broadband, high-reliability, and low-latency communications by utilizing new frequency bands.
Abstract For a business to be successful, it is important for people in the business to consider how other people feel, that is, to consider interpersonal sentiment. Our research goal is to quantitatively predict the strength of interpersonal sentiment by analyzing a small amount of data on office employees, for example, their gender or age group, and data on events such as giving positive feedback on work done and sexual or power harassment without directly asking someone about their change in sentiment. In this article, we propose an interpersonal-sentiment-changing model for this quantification and propose two new analysis methods for developing prediction formulas. These methods can be used even if 90% of data is missing and in environments in which it is difficult to gather data in a comparatively short time. We also implement two visualization systems to predict how interpersonal sentiment changes for each event based on actual office data.
Abstract The World Telecommunication Standardization Assembly was held from October 25 to November 3 in 2016 in Yasmine Hammamet, Tunisia. This article gives an overview of the meeting along with information about the main topics that were discussed.
External Awards/Papers Published in Technical Journals and Conference Proceedings