Dynamic Threshold Adjustment Method for Spma Based on Hierarchical QoS

To address the issues of existing Statistical Prioritybased Multiple Access (SPMA) methods in airborne networks, which lack differentiated priority thresholds and struggle with dynamic load changes, a dynamic threshold adjustment method for SPMA based on hierarchical QoS (HQOS-SPMA) is proposed. By integrating user and service priorities into a comprehensive priority model, HQOS-SPMA employs a non-linear exponential weighting algorithm to dynamically adjust differentiated thresholds, with the threshold range adaptively tuned according to the load state. Simulations show HQOS-SPMA outperforms traditional methods, achieving up to 30 Mbps throughput. Moreover, under low-load conditions, HQOS-SPMA ensures that the success rate of the highest priority transmission is greater than 99%, while the success rate of other priority transmissions is not less than 96%; Under high-load conditions, the highest priority transmission success rate of the HQOS-SPMA remains above 80%, and the lowest priority success rate has increased by about 27% compared to the traditional method.