Cooperative Slotted Aloha with Reservation for Multi-Receiver Satellite IoT Networks

Abstract

How to solve the collision problem in Aloha is a popular research direction all the time. In order to solve this problem in multi-receiver satellite IoT networks, a novel random access scheme named Cooperative Slotted Aloha with Reservation (R-CSA) is proposed. One characteristic of multi-receiver satellite IoT networks is the different propagation delay among receivers, which can be used in the proposed R-CSA for iterative interference cancellation. The other problem common in Aloha schemes is low critical point (after this point, as the normalized load increases, the throughput decreases). For this problem, reservation is considered in the proposed scheme. The performance of R-CSA is analyzed with mathematical method and simulations. Simulation results show that R-CSA outperforms R-CRDSA in terms of packet loss ratio and throughput. According to the simulation results, the critical point of R-CSA is higher than R-CRDSA. And in the aspect of packet loss ratio(PLR), even if the normalized load is up to 1, the PLR of R-CSA is still lower than 0.1.