Recent technological advances have made possible the creation of a chain of non-geostationary satellite orbit (NGSO) communications systems. Such systems offer the advantages of ubiquity, relatively low costs, and upgradable infrastructure that enables the use of innovative on-board technologies. This evolution opens up a plethora of opportunities for massive self-organized, reconfigurable and resilient NGSO constellations, which can operate as a global network.

• Chapter 1: Non-geostationary orbit systems introduction and challenge identification
• Chapter 2: Spectrum regulation for non-geostationary orbit satellite systems
• Chapter 3: The role of non-geostationary orbit satellite systems in 5G integration
• Chapter 4: Flat antenna arrays for non-geostationary orbit communications
• Chapter 5: Low cost per bit for LEO satellite systems: radio-frequency impairments compensation
• Chapter 6: Flexibility/complexity trade-offs in payload design
• Chapter 7: Novel multiple access for non-geostationary orbit communications
• Chapter 8: Radio resource management for non-geostationary orbit
• Chapter 9: Inter-satellite links for non-geostationary orbit systems
• Chapter 10: Non-geostationary orbit constellation design for global connectivity
• Chapter 11: Massive MIMO transmission for non-geostationary orbit
• Chapter 12: Internet of Things over non-geostationary orbit system and random access aspects
• Chapter 13: Virtual network embedding for non-geostationary orbit-terrestrial systems: parallel computation and software defined networking testbed implementation
• Chapter 14: 3rd Generation Partnership Project integration of non-geostationary orbit satellites
• Chapter 15: Anti-jamming solutions for non-geostationary orbit satellite systems
• Chapter 16: Non-terrestrial network testbeds for 5G and beyond
• Chapter 17: Conclusion and future perspectives