Toward the Random Multiaccess in SIoT: A Generalized-Deduplication-Based CRDSA Mechanism

In the Satellite-Integrated Internet of Things (SIoT), typical multiaccess schemes, i.e., contention resolution diversity slotted ALOHA scheme (CRDSA), face with the obvious challenge of heavily conflicting packets regarding high channel traffic, which is not well addressed by the methods of successive interference cancellation (SIC) due to the stubborn loop issues. In this work, therefore, we develop a generalized deduplication (GD)-based CRDSA scheme with a compulsory divorce (CD-CRDSA) mechanism by considering the correlative properties among the accessing data from the users. In particular, the proposed mechanism could effectively separate individual packets from conflicting slots to maintain the sustainability of SIC process, thus achieve better throughput. Moreover, we make the theoretical analysis on the throughput performance with the compression gain of the proposed mechanism. The simulation results indicate that compared to the typical CRDSA protocol and the nonorthogonal multiple access (NOMA) scheme, the proposed CD-CRDSA significantly reduces the amounts of un-resolved slots and improves throughput performance, especially in high load areas.