NOMA-Based CRDSA with Access Control for Next-Generation IoT Networks

This paper proposes access control (AC) scheme for non-orthogonal multiple access (NOMA)-based contention resolution diversity slotted ALOHA (CRDSA-NOMA) to improve the performance of CRDSA-NOMA at high traffic loads, referred to as AC-CRDSA-NOMA. In AC-CRDSA-NOMA, machine-type communications device (MTD) is considered, where an adaptive traffic load is proposed to limit the access probability of the MTD according to an estimated traffic load. It is shown that AC-CRDSA-NOMA outperforms CRDSA-NOMA in terms of packet loss rate (PLR) and normalized throughput. The proposed AC-CRDSA-NOMA is a potential approach to support next generation internet of things (NGIoT) networks.