There is a gap between urban reality and digital dreams. As the grandest vision of the digital dream, the Internet of Things is premised on the ubiquitous coverage of 5G mobile communication base stations. 5G millimetre wave signals have high frequency, poor penetration, and will be blocked when encountering physical obstacles in urban space, so millimetre wave relies on line-of-sight transmission. In the case of unchanged urban space, mobile communication professionals cannot fundamentally solve the problem of millimetre wave occlusion in space and can only obtain the continuity of signal coverage by increasing BSs. The energy consumption and number of superposition 5G base stations are several times that of 4G base stations, and the deployment cost of 5G is high. Based on the above problems and research status, this study aims to clarify the relationship between urban space and mobile communication channels represented by millimetre waves and explore how to integrate the demand for urban space coverage of millimetre wave channels into the existing urban design methodology, that is, to explore the urban design methodology with millimetre wave channel as a new reference factor.