Seiko Solutions Develops Next-Gen Cluster Clock System

Seiko Solutions Inc., in collaboration with the National Institute of Information and Communications Technology (NICT), has developed a proof-of-concept for “Cluster Clock,” a Japanese-originated distributed time synchronization technology designed for 6G next-generation networks. The prototype was showcased at CEATEC 2025 in Makuhari Messe, highlighting Japan’s progress in Beyond 5G infrastructure innovation.

The “Cluster Clock,” made by the Ministry of Internal Affairs and Communications’ Beyond 5G Promotion Fund, provides very accurate time synchronization. It achieves 0.1-nanosecond accuracy, which is crucial for the fast-paced world of 6G. The Cluster Clock keeps many nodes in sync. This keeps it stable, even with network delays or interruptions. Traditional systems rely on GNSS, which isn’t as reliable.

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Seiko Solutions leads the R&D of wired time and frequency synchronization using compact atomic clocks, advancing technologies that ensure robustness, efficiency, and sustainability. The company aims to contribute to the creation of a terrestrial high-precision time distribution platform that reduces dependence on satellite-based systems and supports Japan’s next-generation digital infrastructure.