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.roneverhart.com/Mike-and-Ike-Italian-Ice-Candy-5-Ounce-Packs-12-Piece-Box/