Abstract
Industrial Internet of Things (IIoT) is particularly important as it is used in factory automation, process control and other applications. In this paper, we propose a new performance analysis model and a deployment scheme for random access (RA) devices in three-dimensional (3D) IIoT based on stochastic geometry. Firstly, we propose a new mathematical model suitable for the 3D factory, which can analyze the RA performance of devices in the factory more accurately than the existing two-dimensional (2D) model and the 3D cube model. Then, in order to reduce the data collision probability, avoid the waste of time resources, and achieve the maximum throughput, we propose a device deployment scheme in the 3D factory, which mainly includes the appropriate number of random access opportunity (RAO) slots in a transmission frame and the optimal device density. Finally, we verify the correctness of the analysis by simulation.
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