Gartner Expert

Kosei Takiishi

Sr Director Analyst

Kosei Takiishi works in the TSP Industries team and he covers telecom markets and the Industry Product Planning and Strategy and Industry Strategy Execution Key Initiatives for Product Managers and Tech CEOs.

Mr. Takiishi based in Tokyo, Japan and his current research interests include wireless technology evolution such as 5G/4.xG/4G/M2M/IoT/SDN/NFV/vRAN/private 4G/5G and related competitive landscapes.

Previous experience

Before joining Gartner, Mr. Takiishi was a Senior Engineer responsible for mobile device development and frequency strategy at NTT Docomo. Prior to that, he was in the company's global business division to launch international roaming services (LTE, Wi-Fi, M2M) and contribute to GSMA standardization activities. He also worked as a researcher in NTT Docomo's laboratory to develop radio propagation algorithms, M2M and positioning systems.

Professional background

NTT Docomo

Senior Engineer

Areas of coverage

CSP Digital Transformation and Innovation

Product/Service Organization and Leadership


B.E., Electrical and Electronics Engineering, Tokyo Institute of Technology

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Top Issues That I Help Clients Address

1Mobile infrastructure (LTE/4.xG/5G/6G) and SDN/NFV including open RAN, vRAN and cloud RAN

2Radio frequency strategy for mobile communications

3Technical impact assessment about wireless innovations

4M2M/IoT connectivity includes low power wide area (LPWA) network

5Mobile infrastructure market, provide vendors' competitive analysis, key trends as well as market share, forecasts in Japan