RF/Wireless Communication Engineer, NTN RAN Development Group - Spectrum Engineering Section (RMI NTN Business Strategy Dep)

Job Description: About Organization This organization aims to provide the most attractive and convenient service that meets customers’ needs and demands through its own innovative technology and spirit. To produce future world-standard innovations, the team challenges its own possibilities and strives to build a workplace with an environment and system full of opportunities.

The department is responsible for NTN (Non-Terrestrial Network) development, deployment, and commercialization for Rakuten Mobile. This involves overcoming various challenges, such as the proposal of RAN solutions for flying LEO satellites, which cause significant delay and Doppler shift. Additionally, it requires proposing deployment solutions by enabling NTN to coexist with terrestrial telecom networks and other networks operating in adjacent spectrum.

The organization seeks talented individuals who can take on and enjoy these challenges. Job Duties In this role, the individual will have all or part of the following responsibilities: NTN RAN Solution Development: Deeply understanding RAN, RF, and propagation models to contribute to or lead NTN RAN solutions. This specifically includes determining what kinds of services/features NTN should and should not provide.

Vendor Collaboration: Collaborating with the TN RAN team to follow the progress of RAN vendors and ensure timely delivery. Spectrum Efficiency: Proposing coexistence solutions between TN and NTN to improve spectrum efficiency. E2E Integration: Collaborating with Core, OSS, BSS, and security teams to ensure smooth and successful end-to-end integration.

Field Testing: Participating in or leading field tests, creating test scenarios, collecting and analyzing data, and generating test reports.

Minimum Qualifications

Deep knowledge in the radio/wireless communication field (+3 years of experience in related field, or technical background equivalent to such experience) Excellent communication skills in Japanese Preferred Qualifications: Solid understanding the link budget and PHY of the current cellular networks including 5G and LTE Familiar with radio propagation models, antenna patterns Holds radio operator license of Japan, certified as Chief Telecommunications Engineer Familiar with the radio propagation related simulation tools Familiar with standard like ITU-R, 3GPP, etc.

Familiar with Japanese Radio regulations Languages: English (Overall - 3

• Advanced), Japanese (Overall - 3
• Advanced)