tor experience to consumers during the Tokyo Olympic-Paralympic Games. We have been aggressively pursuing the creation of new services for the 5G era, such as the DOCOMO 5G Open Partner Program, and we believe that many new enterprise services can be created together with a variety of industry partners and that the market size of enterprise services can be expanded drastically utilizing 5G characteristics. This book provides a combination of 5G specification explanations, performance eval- uations, device design aspects, practical deployment considerations, and field experi- ences that will help to roll out and tune 5G networks. The book has been written by more than 30 experts from multiple companies around the world, including network infrastructure and chipset vendors and mobile operators. My colleague Takehiro Nakamura has been a key contributor inside NTT DOCOMO and also globally in 5G standardization, development, and early testing. He has nearly 30 years of experience in the field. Harri Holma and Antti Toskala from Nokia Bell Labs bring worldwide knowledge of 5G technology and its details. Harri and Antti have 25 years experience in the industry starting from early days of 3G research. Foreword I believe that you will find this book enjoyable and useful in helping you to enhance your understanding about the potential of 5G technology. I hope that we can witness together a successful future for 5G technology during the next decade. Hiroshi Nakamura Executive Vice President Member of the Board of Directors NTT DOCOMO, INC. Preface Long-Term Evolution (LTE) networks were launched commercially in 2009, and the technology proved to be hugely successful for boosting mobile broadband capabilities. Global mobile data traffic has grown by a factor of 10 during the last five years. LTE has enabled a large number of new applications in smartphones and has brought high speed Internet access to hundreds of millions of people that never had Internet access earlier. 5G targets are set far beyond LTE in terms of technica