bringing together three certified wireless communication routes under a single, interoperable framework built on the open IEEE 802.15.4 SUN physical layer.
The Home Area Network (HAN) profile focuses specifically on the connected energy home — linking electricity meters, energy management systems, and household devices.
Wi-SUN HAN 2.0 defines three distinct communication paths: Route IoT, Route B, and Route HAN. Each is optimised for a specific link within the home energy ecosystem. All three share the same IEEE 802.15.4 SUN physical layer operating in the 920 MHz Sub-GHz band, ensuring compatibility and minimising development costs.
Rather than deploying separate wireless systems for multiple applications such as gas and water meters, EV charging systems, energy management systems, solar power storage, and distributed energy resources, Route IoT carries all of this data through the existing electricity smart meter infrastructure.
Route IoT specifically supports:
Route B is the original and most widely deployed Wi-SUN HAN profile. It originated within the Japanese smart-meter ecosystem and has become the dominant HAN communication model in that market.
Route B operates between the electricity smart meter (installed by the power company) and a customer-side HEMS controller or in-home display.
Using the ECHONET Lite application protocol over 920 MHz, Route B gives householders real-time visibility of their electricity consumption, enabling time-of-use tariff management, peak load avoidance, and integration with solar and storage systems.
Route HAN extends the HEMS ecosystem to individual appliances throughout the home. Air conditioners, refrigerators, washing machines, water heaters and lighting fixtures supporting ECHONET Lite communicate directly with the HEMS gateway, enabling automated scheduling, energy optimization, and demand-response participation.
The Enhanced HAN extension of Route HAN adds relay functionality, allowing appliances in areas with weak radio coverage to connect through intermediate HAN nodes. It also supports sleeping device modes, critical for battery-operated sensors that need to operate for years without maintenance.
All three routes share a common physical and network layer, significantly reducing the cost and complexity of developing multi-route products:
| Route IoT | Route B | Route HAN | |
|---|---|---|---|
| Frequency | 920 Mhz | 920 Mhz | 920 Mhz |
| PHY Standard | IEEE 802.15. SUN | IEEE 802.15. SUN | IEEE 802.15. SUN |
| App Protocol | JUTA Route IoT app | ECHONET Lite | ECHONET Lite |
| Primary Link | Meter <-> Gas / Water / EV | Meter <-> HEMS | HEMS <-> Appliances |
| Relay Support | Route IoT Realy | (none) | Enhanced HAN Relay |
| Power Profile | Battery (10+ years) | Mains powered | Mains / Battery |
| Security | AES-128 + PANA | AES-128 + PANA | AES-128 + PANA |
The technical specifications for Route IoT,
Route B, and Route HAN have been adopted in the TTC JJ300.10 technical specification document published by TTC, a Japanese SDO (Standard Development Organization), and are publicly available.