Frame aggregation is one of the efficient methods to improve wireless channel utility of MAC (Media Access Control) and spectral efficiency. Aiming at multi-services, this paper adopts two-level buffer mechanism and polls each queue for aggregation according to aggregation weight factor. The aggregation weight factor of each queue is dynamically adjusted based on the packet overtime urgent factor defined to meet with the delay requirement of each QoS type of service. This paper introduces queue theory into the performance analysis of frame aggregation scheme. A mathematical analysis model is set up. Additionally, the relationship of main performance parameters and system load is quantificationally analyzed. Compared with the performance of the two-level aggregation scheme defined in IEEE 802.11n standard, the proposed scheme indicates the performance of the new frame aggregation scheme is more efficient than the two-level aggregation scheme defined in 802.11n standard.%帧聚合是改善无线MAC(Media Access Control)协议信道利用率,提高频谱效率的有效手段之一.该文针对多业务场景,采用两级缓冲区调度策略,按照不同聚合权重因子对各队列轮询聚合.根据各个队列的包超时紧迫因子动态调整各队列的聚合权重,以满足各QoS等级业务的时延限制.该文还将排队论模型引入到帧聚合策略的性能分析中,建立了系统的数学分析模型,定量分析了主要性能参数与系统负载的关系.通过与IEEE 802.11n标准中定义的两层帧聚合策略比较表明,该文提出的帧聚合策略的性能优于IEEE 802.11n两层帧聚合策略.
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