1  Cover

      2  Title Page

      3  Copyright Page

      4  Editor Biographies

      5  List of Contributors

      6  Foreword Henning Schulzrinne

      7  Foreword Peter Stuckmann

      8  Foreword Akihiro Nakao

      9  Acronyms

      10  1 Toward 6G – Collecting the Research Visions 1.1 Time to Start Shaping 6G 1.2 Early Directions for Shaping 6G 1.3 Book Outline and Main Topics

      11  2 6G Drivers for B2B Market: E2E Services and Use Cases 2.1 Introduction 2.2 Relevance of the B2B market for 6G 2.3 Use Cases for the B2B Market 2.4 Conclusions References Note

      12  3 6G: The Path Toward Standardization 3.1 Introduction 3.2 Standardization: A Long‐Term View 3.3 IMTs Have Driven Multiple Approaches to Previous Mobile Generations 3.4 Stakeholder Ecosystem Fragmentation and Explosion 3.5 Shifting Sands: Will Politics Influence Future Standardization Activities? 3.6 Standards, the Supply Chain, and the Emergence of Open Models 3.7 New Operating Models 3.8 Research – What Is the Industry Saying? 3.9 Can We Define and Deliver a New Generation of Standards by 2030? 3.10 Conclusion References

      13  4 Greening 6G: New Horizons 4.1 Introduction 4.2 Energy Spreadsheet of 6G Network and Its Energy Model 4.3 Greening 6G Radio Access Networks 4.4 Greening Artificial Intelligence (AI) in 6G Network 4.5 Conclusions References

      14  5 “Your 6G or Your Life”: How Can Another G Be Sustainable? 5.1 Introduction 5.2 A World in Crisis 5.3 A Dilemma for Service Operators 5.4 A Necessary Paradigm Shift 5.5 Summary and Prospects References

      15  6 Catching the 6G Wave by Using Metamaterials: A Reconfigurable Intelligent Surface Paradigm* 6.1 Smart Radio Environments Empowered by Reconfigurable Intelligent Surfaces 6.2 Types of RISs, Advantages, and Limitations 6.3 Experimental Activities 6.4 RIS Research Areas and Challenges in the 6G Ecosystem References

      16  7 Potential of THz Broadband Systems for Joint Communication, Radar, and Sensing Applications in 6G References

      17  8 Non‐Terrestrial Networks in 6G 8.1 Introduction 8.2 Non‐Terrestrial Networks in 5G 8.3 Innovations in Telecom Satellites 8.4 Extended Non‐Terrestrial Networks in 6G 8.5 Research Challenges Toward 6G‐NTN 8.6 Conclusion References

      18  9 Rethinking the IP Framework 9.1 Introduction 9.2 Emerging Applications and Network Requirements 9.3 State of the Art 9.4