Guest Editorial: Passive Reflective Communication for Internet of Things: Part 2

The vision of 'Internet of Things and Digital Twin' depicts the deep integration of humans, machines, and objects, with the potential to achieve seamless connectivity between millions of people and billions of devices. However, the massive data traffic and numerous terminal access devices pose challenges such as spectrum resource scarcity and heightened energy consumption concerns to the 6G Internet of things (IoT). Therefore, there is an urgent need to develop innovative communication technologies that combine spectrum and energy efficiency to address these challenges.