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The Media Access Control (MAC) protocol is a critical component of wireless communication systems. The Statistical Priority-based Multiple Access (SPMA) protocol optimizes channel resource allocation through priority thresholds and a backoff mechanism. However, in specific scenarios, the traditional SPMA protocol exhibits shortcomings in threshold setting and backoff time calculation. This paper proposes an improved protocol that combines dynamic threshold adjustment and a multi-factor backoff mechanism. For dynamic threshold adjustment, the protocol adapts the thresholds in real-time based on the transmission success rate of data packets at each priority level, ensuring alignment with dynamic service demands. Under high-load conditions, a circuit-breaker mechanism is employed to suppress low-priority transmissions. In terms of backoff time calculation, a channel load differential factor is introduced, integrating priority level, traffic proportion, and load variation speed to construct a multi-factor fusion back-off algorithm. Simulation results demonstrate that the improved protocol significantly outperforms the traditional SPMA protocol in network throughput, transmission success rate, and latency performance. Under low-load scenarios, the transmission success rate of low-priority traffic improves by approximately 5%. In high-load scenarios, the circuit breaker mechanism suppresses low-priority transmissions, ensuring that the transmission success rate of high-priority traffic remains above 80%. At the same time, the improved protocol controls the average end-to-end delay of all priority levels within 10 ms, with the highest priority delay being less than 2 ms, effectively meeting the requirements for differentiated service quality.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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