High density and ultra-high density communication networks are currently being introduced based on the density requirements for IoT devices. For 3D Ultra-high density networks, the density of IoT devices is 100 devices per cubic meter. Such networks have certain design peculiarities and different fractal figures can be used for their planning. Therefore, it is required to develop models and test methods for high density and ultra-high density networks. New models and test methods for three-dimensional ultra-high density IoT networks will be developed and the structure of a model network for testing will be presented in the proposed Recommendation.