The field of 6G research is moving towards developing flexible and high-performance radio access networks that can efficiently handle future traffic demands. A key focus area is the integration of Terrestrial Networks (TN) and Non-Terrestrial Networks (NTN) to achieve ubiquitous connectivity, with a emphasis on sustainability and Net-Zero energy targets. Researchers are exploring innovative solutions such as cell-free Massive MIMO, distributed Multiple Input Multiple Output (MIMO), and Cloud RAN to optimize performance and enable adaptiveness and scalability. Another important aspect is the development of intelligent radio network planning frameworks that can bridge legacy 5G infrastructures with future B5G/6G networks. Noteworthy papers include: Flexible and High-Performance Radio Access Networks for upcoming Sixth-Generation (6G) Systems, which proposes a flexible 6G RAN functional architecture and protocol stack. From Legacy to Leadership Intelligent Radio Network Planning Framework for Cell-Free Massive MIMO in B5G6G Era, which presents a scalable framework for transitioning from traditional cellular architectures to cell-free systems. Net-Zero 6G from Earth to Orbit: Sustainable Design of Integrated Terrestrial and Non-Terrestrial Networks, which outlines key enabling technologies for achieving Net-Zero energy targets in integrated TN and NTN systems.