该修正案规定了对802.11 MAC（媒体访问控制）的增强，以实现强大的音频视频流，同时保持与其他类型流量的共存。本修正案中规定的MAC增强功能允许:*在信道容量不足时，通过启用数据包丢弃而无需进行深度数据包检查，从而实现音频视频流的优雅降级，*在重叠BSS环境中增强了鲁棒性，无需中央管理实体，*通过修改EDCA定时和参数选择来确定传输流的内部访问类别优先级，而无需进行深度数据包检查，*提高了多播/广播音频视频流的链路可靠性和低抖动特性，*与相关802。 1AVB机制（802.1Qat、802.1Qav、802.1AS）

This amendment specifies enhancements to the 802.11 MAC (Medium Access Control)for robust audio video streaming, while maintaining co-existence with other types of traffic. The MAC enhancements specified in this amendment enable: * Graceful degradation of audio video streams when there is insufficient channel capacity, by enabling packet discarding without any requirement for deep packet inspection, * Increased robustness in overlapping BSS environments, without the requirement for a centralised management entity, * Intra-Access Category prioritization of transport streams by modifying EDCA timing and parameter selection without any requirement for deep packet inspection, * Improved link reliability and low jitter characteristics for multicast/broadcast audio video streams, * Interworking with relevant 802.1AVB mechanisms (802.1Qat, 802.1Qav, 802.1AS)