Cross-Layer Approach to Multiuser H.264 Video Transmission over Wireless Networks
Cross-Layer Approach to Multiuser H.264 Video Transmission over Wireless Networks
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DOI：
10.4304/jmm.5.2.110-117
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
Fan Li;Guizhong Liu;Lijun He
中科院分区：
文献类型：
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作者：
Fan Li;Guizhong Liu;Lijun He
本文提出了一种新的跨层方法，多用户H.264/AVC视频流传输在无线网络。我们考虑了三层协议栈的联合优化：应用（APP）层，媒体访问控制（MAC）层和物理（PHY）层。在APP层，通过分组丢失的失真效应来评估每个分组对感知视频质量的贡献，该失真效应通过分组相对重要性指数（PRII）来估计。在MAC层和PHY层，Gilbert-Elliott（GE）模型被用来描述无线网络的时变特性。基于对APP层、MAC层和PHY层的分层抽象参数，建立了跨层优化的目标函数。我们的目标是在有限资源的约束下最大限度地提高通过无线网络传输的视频的感知质量。仿真结果表明，该方案的性能显着优于传统的视频传输调度方案。
This paper presents a novel cross-layer approach to multiuser H.264/AVC video stream transmission over wireless networks. We consider the joint optimization of three layers of the protocol stacks: the application (APP) layer, the media access control (MAC) layer and the physical (PHY) layer. At the APP layer, the contribution of each packet to the perceptual video quality is evaluated by distortion effect of the packet loss, which is estimated by a Packet Relative Importance Index (PRII). At the MAC layer and the PHY layer, the Gilbert-Elliott (GE) model is employed to describe the time-varying nature of the wireless networks. An objective function for cross-layer optimization is developed based on the layered abstracted parameters from the APP layer, the MAC layer and the PHY layer. Our goal is to maximize the perceptual quality of the video transmitted through the wireless network with constraint of the limited resources. Simulation results show that the proposed scheme performs significantly than the conventional scheduling schemes for video transmission.