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As the fifth-generation (5G) wireless communication networks are at the stage of commercial deployment, beyond 5G (B5G)/sixth-generation (6G) wireless communication networks have also been under extensive research. In the B5G/6G era, the vision of the wireless communication network is the so-termed space-air-ground-sea integrated network (SAGSIN), which will focus on more various and dynamic communication scenarios, including vehicle-to-vehicle (V2V), high-speed train (HST), unmanned aerial vehicle (UAV), satellite, and maritime communications. Meanwhile, B5G/6G communication systems will also employ two potential technologies, i.e., millimeter wave (mmWave)-terahertz (THz) and ultra-massive multiple-input multiple-output (MIMO), and have a new development trend, i.e., integrated sensing and communication (ISAC) systems. For the successful design of B5G/6G communication systems …