As a new type of mobile communication network, 5G must not only solve human-to-human communication, but also provide users with a more immersive and extreme service experience such asaugmented reality, virtual reality, and ultra-high-definition (3D) video. The problem of communication between things and things meets the needs of Internet of Things applications such as mobile medical, car networking, smart home, industrial control, and environmental monitoring. In the end, 5G will penetrate into various industries and fields of the economy and society, and become a key new infrastructure supporting the digital, networked, and intelligent transformation of the economy and society.