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6G network will also be the opportunity to introduce innovative communication mechanisms. Chapter 16 lays out a disruptive view of 6G, addressing major innovations becoming possible by the new post‐Shannon theory. To truly achieve the potential gains of post‐Shannon communication, we have to break with the concept of a physical layer as a mere transport channel, as the needed algorithms cannot only rely on the softwarized higher layers. A new structure of the physical layer is required to integrate new communication tasks, such as message identification, secure message transmission, and CR (common randomness, i.e. correlated results of a random experiment) generation and extraction with higher layer policies that assign different logical channels for the different services. Chapter 16 provides comprehensive insights on these challenges and evolutions.

We hope you gain interesting insights into the major complementary research aspects of 6G summarized in the Figure 1.1.

Figure 1.1 Major trends toward 6G.

We are only at the beginning of a long journey toward 6G, which will hit the market by 2030 and provide the major communications infrastructure until 2040. The fun part is that although it will be a global race to generate new IP, ongoing globalization of our economic markets will necessitate close cooperation among researchers on different continents. We strongly believe that in the end, 6G will be the center of all future communications, connecting all people and things on this planet with infrastructures enabling flexibility and innovation while ensuring trust, reliability, and sustainability.

Have a nice trip, and enjoy reading,

Thomas, Noel, and Emmanuel