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FlexVi: PHY Aided Flexible Multicast for Video Streaming over IEEE 802.11 WLANs

机译:FlexVI:PHY辅助灵活的多播,用于IEEE 802.11 WLANS上的视频流

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Wireless video multicast over IEEE 802.11 WLANs is a viable approach to bridging the gap between limited wireless resources and the ever-increasing mobile video traffic demand. However, existing wireless multicast mechanisms have several limitations, such as low spectral efficiency, high feedback overhead, and lack of consideration of the frame aggregation feature of current WLANs. In this paper, we propose FlexVi, a flexible wireless multicast solution for efficient video streaming over WLANs. Considering the frame aggregation of the current WLANs, FlexVi allows an access point to dynamically adjust the data rate on the basis of three factors: available wireless bandwidth, heterogeneity of the channel qualities among the clients, and the priorities among the video frames in terms of video quality. In addition, by harnessing the orthogonality of the subcarriers in the orthogonal frequency division multiplexing, FlexVi enables multiple clients to deliver their feedback to an access point simultaneously without collision, which results in very low feedback overhead. We verified the feasibility of FlexVi through experiments on a software defined radio platform. We also conducted an extensive simulation study and found that FlexVi outperforms the latest wireless multicast mechanisms.
机译:IEEE 802.11上的无线视频组播是一种可行的方法,可以弥合有限无线资源与不断增加的移动视频流量需求之间的差距。然而,现有的无线多播机制具有若干限制,例如低频频率,高反馈开销,以及缺乏对当前WLAN的帧聚合特征的考虑。在本文中,我们提出了FlexVI,这是一个灵活的无线多播解决方案,用于在WLAN上有效的视频流。考虑到当前WLAN的帧聚合,FlexVi允许接入点在三个因素的基础上动态调整数据速率:可用的无线带宽,客户之间的信道质量的异质性,以及视频帧之间的优先级视频质量。另外,通过利用在正交频分复用中的子载波的正交性,FlexVI使多个客户端能够同时向接入点传输到接入点,而不会发生冲突,这导致非常低的反馈开销。我们通过实验在软件定义的无线电平台上进行了实验验证了FlexVI的可行性。我们还进行了广泛的仿真研究,发现FlexVi优于最新的无线组播机制。

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