Single-radio demonstration combines Wi-SUN HAN and Wi-SUN FAN for smart-meter communications
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A Kyoto University research group says it demonstrated a module that combines communications between smart meters and utilities with communications between meters and home energy-management systems, using one radio and common firmware.
Two in-home and outdoor standards on one radio
According to the group, its module ran Wi-SUN FAN, intended for the outdoor-side link between a power smart meter and a utility, alongside Wi-SUN HAN, used for the in-home link between a meter and a home energy-management system (HEMS). In a HEMS-oriented model, it reported a Wi-SUN FAN data-delivery rate of at least 99.99% and a 99.95% on-time response rate for Wi-SUN HAN power-value reads at 10-second intervals.
The group had announced common firmware for both standards in May 2026. The source describes the newly added functions as radio-sharing arbitration and rapid physical-layer switching.
The reported firmware adds a mechanism for time-sharing one radio between the two standards and a function that switches communication methods in about 1 millisecond round trip while maintaining connection states.
Delivery and timely-response rates measured separately
The experiment reportedly integrates two standards used on opposite sides of a smart meter in one radio module. The group describes lower cost and smaller wireless sections as expected applications; deployment in operating metering systems is not established by the report.
Sources
- 京都大学 研究成果異なる2つの国際無線通信規格「Wi-SUN HAN」と「Wi-SUN FAN」の同時動作を単一無線機で実現―次世代スマートメーターの宅内・屋外通信を統合し、無線機の低コスト化・小型化へ―Read source →