qos感知自适应A-MPDU聚合调度器,用于在启用聚合的wlan上增强VoIP容量

Shinnazar Seytnazarov, Young-Tak Kim
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引用次数: 19

摘要

目前可用的支持聚合的无线局域网(WLAN)实现由于对端到端时延的严格要求,无法将聚合MAC协议数据单元(A-MPDU)聚合应用于实时VoIP (voice over Internet protocol)业务。当无线局域网的VoIP会话数量增加时,移动站(MS)和接入点(AP)都会面临严重的语音包丢失,从而导致无法接受的服务质量(QoS)。因此,在目前可用的实现下,IEEE 802.11n和802.11ac等支持聚合的wlan的VoIP容量非常有限。在本文中,我们提出了一种QoS感知的自适应a - mpdu聚合调度器,用于在支持聚合的WLAN上增强VoIP容量,该调度器考虑到WLAN中的动态争用、骨干网的延迟以及实时语音流量的端到端QoS要求,自适应地将a - mpdu聚合应用于MS和AP节点的语音流量。性能评估表明,与现有实现相比,该方案可以实现高达5.3倍的容量,同时以小于150ms的端到端延迟和小于50ms的平均抖动将所有语音数据包传输到目的地
本文章由计算机程序翻译,如有差异,请以英文原文为准。
QoS-aware adaptive A-MPDU aggregation scheduler for enhanced VoIP capacity over aggregation-enabled WLANs
Currently available aggregation-enabled wireless local area network (WLAN) implementations do not apply aggregate MAC protocol data unit (A-MPDU) aggregation to real-time voice over Internet protocol (VoIP) traffic because of its strict end-to-end delay requirements. When the number of VoIP sessions in WLAN increases, both mobile station (MS) and access point (AP) face heavy voice packet losses leading to unacceptable quality of service (QoS). Therefore, VoIP capacity of aggregation-enabled WLANs like IEEE 802.11n and 802.11ac is very limited under currently available implementations. In this paper, we propose a QoS-aware adaptive A-MPDU aggregation scheduler for enhanced VoIP capacity over aggregation-enabled WLANs, which adaptively applies A-MPDU aggregation to voice traffic at both MS and AP nodes, considering dynamic contention in WLAN, delay in backbone network, and end-to-end QoS requirements of real-time voice traffic. Performance evaluations of the proposed scheme showed that it can achieve as much as 5.3 times bigger capacity compared to the existing implementations, while delivering all voice packets to destination with less than 150ms end-to-end delay and less than 50ms average jitter.1
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