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首页> 外文会议>Broadband Multimedia Systems and Broadcasting, 2009. BMSB '09 >Video quality over 802.11e with a multi-rate 802.11g physical layer
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Video quality over 802.11e with a multi-rate 802.11g physical layer

机译：具有多速率802.11g物理层的802.11e上的视频质量

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摘要

Many homes now have an 802.11 wireless local area network (WLAN) with a high speed internet connection. 802.11e enhanced distributed channel access (EDCA) allows for traffic prioritisation over 802.11 WLANs which can allow for the QoS demands of the increasing number of multimedia applications on the home network to be met. Providing quality of service (QoS) for delay constrained video applications can be especially challenging due to the bursty nature of video streams. Wireless networks, having a time varying channel, can suffer from physical layer rate switching which can cause a sudden drop in channel capacity and therefore a possible increase in congestion. In this paper we investigate how video quality varies as the number of parallel video streams is increased over a multi-rate 802.11e WLAN. Several traffic mapping schemes are compared from two distinct groups: The non-differentiated schemes treat all video packets equally and the differentiated schemes prioritise video packets based on their frame type. When congestion increases, due to an increase in the number of parallel video streams or due to a drop in physical layer rate, it is found that the non-differentiated schemes suffer from a steep drop in quality while the differentiated schemes offer a much gentler decline. While the differentiated schemes offer the best performance during congestion the success of each scheme is greatly affected by the content of the streamed video sequence.
机译：现在，许多家庭都具有带有高速Internet连接的802.11无线局域网（WLAN）。 802.11e增强型分布式信道访问（EDCA）允许通过802.11 WLAN进行流量优先级划分，从而可以满足家庭网络上越来越多的多媒体应用程序的QoS要求。由于视频流的突发性，为延迟受限的视频应用提供服务质量（QoS）可能尤其具有挑战性。具有随时间变化的信道的无线网络可能会遭受物理层速率切换的影响，这可能会导致信道容量突然下降，从而可能导致拥塞增加。在本文中，我们研究了在多速率802.11e WLAN上，随着并行视频流数量的增加，视频质量如何变化。从两个不同的组中比较了几种流量映射方案：非差异方案平等地对待所有视频数据包，差异方案根据视频数据包的帧类型对它们进行优先排序。当拥塞增加时，由于并行视频流的数量增加或由于物理层速率的下降，发现非差分方案的质量急剧下降，而差分方案的下降幅度要小得多。尽管差异化方案在拥塞期间提供最佳性能，但每种方案的成功都受到流视频序列内容的极大影响。

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