As one of the emerging technologies of low-power wide-area Internet of things. narrow band Internet of things (NB-IoT) faces the pressure and challenge of massive connections of terminals. Aiming at practical application scenarios. a preamble allocation scheme based on Beta distribution was proposed. https://www.diegojavierfares.com/top-super-Geometric-Green-and-Blue-Square-Tablecloth-amazing-save/