Rakuten Mobile and the University of Tokyo Begin Joint R&D into IoT Ultra Coverage Utilizing LEO Satellites

- R&D part of NICT “Beyond 5G R&D Promotion Project”

Tokyo, November 29, 2021 - Rakuten Mobile, Inc. today announced that it has begun joint research and development into “IoT ultra coverage utilizing low Earth orbit (LEO) satellites” with the University of Tokyo Graduate School of Engineering. The research topic is one of the R&D themes of the “Beyond 5G R&D Promotion Project,” which the National Institute of Information and Communications Technology (NICT) recently publicly invited applications for proposals. The two organizations will use satellite communications to expand geographical coverage to 100% and enable long distance communications with existing NB-IoT and IoT devices with the aim of achieving IoT ultra coverage.

In the R&D, Rakuten Mobile and the University of Tokyo will leverage their respective expertise in satellite communications technology*1 and narrowband IoT (NB-IoT) to build an IoT network using LEO satellite communications and establish new use cases for IoT services using NB-IoT and LTE devices.

NB-IoT is a telecommunications standard for low power IoT devices that uses a very narrow band of spectrum. With NB-IoT, small amounts of data can be sent at infrequent intervals, making the standard ideal for use in IoT services which require low power consumption, such as smart meters and sensors.

By building an NB-IoT and LTE network using satellites, it will become possible to provide low cost IoT services for various industries in locations that would typically be out of network coverage, such as mountainous areas, remote islands or on the sea.


Diagram of the mobile network architecture using LEO satellites

Details of the R&D
Theme: “R&D into IoT ultra coverage utilizing low Earth orbit (LEO) satellites”

Overview: The R&D aims to construct a satellite communications network that can collect data directly from IoT sensors, using LEO satellites to achieve 100% geographical coverage. R&D will be carried out in the following three areas.

1-a) Construction of an LTE satellite communications network (Rakuten Mobile)
1-b) Stabilization and optimization of LTE satellite communications, development and deployment of NB-IoT software for satellites (Rakuten Mobile, the University of Tokyo)
1-c) Investigation of use cases for IoT ultra coverage, and trials of IoT ultra coverage (Rakuten Mobile, the University of Tokyo)

Period: November 2021 to end of March 2025 (planned)

Through the R&D, Rakuten Mobile aims to enhance its satellite communications network to provide a more convenient service to its customers and contribute to the development of telecommunications technologies in Japan.

*1 Rakuten Mobile is collaborating with AST SpaceMobile to build a satellite-based communications network using LEO satellites. With a space-based mobile broadband network, the two companies aim to provide mobile service to areas that would typically be out of coverage, such as mountainous areas, remote islands or on the sea. Rakuten Group, Inc. has invested in AST SpaceMobile and has formed a strategic partnership with the company. For more information, please see the following press release: https://global.rakuten.com/corp/news/press/2020/0303_02.html

*Please note that the information contained in press releases is current as of the date of release.

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