An Intelligent Load Control-Based Random Access Scheme for Space-Based Internet of Things

Area of Science:

• * Wireless communication and networking
• * Space-based Internet of Things (S-IoT) systems
• * Multiple access schemes

Background:

• * Random access schemes are crucial for S-IoT due to massive connectivity and grant-free transmission needs.
• * Existing schemes suffer from sharp throughput degradation under high or dynamic network loads, common in S-IoT.
• * Variable satellite coverage and bursty traffic exacerbate load sensitivity, reducing actual S-IoT throughput below theoretical limits.

Purpose of the Study:

• * To propose an intelligent load control mechanism for random access in S-IoT.
• * To enhance the Contention Resolution Diversity Slotted ALOHA (CRDSA) scheme for S-IoT environments.
• * To improve overall network throughput and efficiency in dynamic S-IoT networks.

Main Methods:

• * Development of Load Control-based Three-Replica Contention Resolution Diversity Slotted ALOHA (LC-CRDSA3), extending CRDSA with three replicas.
• * Implementation of a Maximum Likelihood Estimation (MLE)-based algorithm for accurate frame load estimation.
• * Integration of computational intelligence-based time series forecasting for predictive load management.

Main Results:

• * LC-CRDSA3 actively manages network load to remain near a critical value, preventing throughput collapse.
• * The MLE-based load estimation effectively utilizes time slot status for accurate load assessment.
• * Time series forecasting enables prediction of future network loads for proactive control.
• * Simulations show LC-CRDSA3 achieves throughput close to the theoretical maximum in dynamic S-IoT scenarios, outperforming CRDSA++.

Conclusions:

• * LC-CRDSA3 provides an effective solution for maintaining high throughput in S-IoT networks with dynamic load conditions.
• * Intelligent load control, enabled by MLE and time series forecasting, is key to overcoming limitations of traditional random access schemes in S-IoT.
• * The proposed scheme offers a robust and efficient multiple access solution for future S-IoT applications.