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A Wireless Standard for Joint Metering in Japan Enters into Force, Adopting Wi-SUN Enhanced HAN

Tokyo, Japan – The Wi-SUN Alliance, a global ecosystem of companies seeking to accelerate the implementation of communication networking for Utilities, Smart Cities and the Internet of Things (IoT), today announced that a new Wi-SUN enhanced Home Area Network (HAN) standard has been officially established for joint metering of gas and water meters and special-purpose measuring instruments such as EV charger and solar power battery using the electricity smart meter system. This standard was adopted by Next Generation Smart Meter System Study Group at the Ministry of Economy, Trade and Industry, Japan as a wireless standard for the “IoT route” defined for the joint metering. Based on this standard, TTC JJ-300.10, a standard for home network communication interfaces established by the Telecommunications Technology Committee (TTC), a standard development organization (SDO) of Japan, has been revised and officially put into effect. With the standard now in effect, services utilizing Wi-SUN systems will accelerate, and the practical application of joint metering with smart meters for electric power, water and gas meters, and special-purpose measuring instruments will also advance in Japan.

What is Enhanced HAN

The Enhanced HAN profile is an enhanced version of the original Wi-SUN HAN profile. The basic HAN profile defined a single-hop architecture and supported “N : 1 communication” between smart meter, Home Energy management system (HEMS), and home appliance devices. Enhanced HAN, on the other hand, provides multi-hop capability with relay as well as support for sleeping devices, which can enter a very low power state when not communicating. This allows for extended battery life in sleeping devices. The revised Enhanced HAN adds new interfaces and functionality for joint metering of gas meters, water meters, and special metering instruments over power metering systems.

The certification program for the new Enhanced HAN for IoT route is scheduled to open by September, 2024.

According to Dr. Hiroshi Harada, NICT and chairman of the Wi-SUN Alliance HAN working group (WG), “The Wi-SUN HAN communication specification defines functions to complete HAN using smart meters and has already been installed in tens of millions of units in Japan, mainly in electric power smart meter systems. I believe that the number of Wi-SUN HANs installed in Japan will increase dramatically when they are further introduced to smart meters other than electric power using electric power smart meter systems and to joint meter reading systems for special-purpose measuring instruments. Wi-SUN HAN WG will continue to improve our WI-SUN HAN specifications to provide stable communication quality for several new applications.”

Phil Beecher, President of Wi-SUN Alliance, stated, “Wi-SUN Alliance is pleased to collaborate with TTC to deliver reliable, interoperable communications technology for the next generation of smart meters in Japan. This new specification represents Wi-SUN’s ongoing commitment to provide solutions for new and emerging applications”


About Wi-SUN Alliance

The Wi-SUN Alliance is a global non-profit member-based association comprised of industry leading companies. Its mission is to drive the global proliferation of interoperable wireless solutions for use in smart cities, smart grids and other Internet of Things (IoT) applications using open global standards from international standard development organizations, such as IEEE802, IETF, TIA, TTC and ETSI. With more than 250 members worldwide, membership of the Wi-SUN Alliance is open to all industry stakeholders and includes silicon vendors, product vendors, services providers, utilities, universities, enterprises and municipalities and local government organizations.

For more information, please visit: www.wi-sun.org.

To read this press release in Japanese, please click here.