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arXiv 2412.12751cs.NIeess.SP
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在ORAN环境中利用生成AI的低延迟视频流实验研究

Experimental Study of Low-Latency Video Streaming in an ORAN Setup with Generative AI

Aalborg University(奥尔堡大学)

Andreas Casparsen, Van-Phuc Bui, Shashi Raj Pandey, Jimmy Jessen Nielsen, Petar Popovski

AI总结:

本研究提出一种基于生成AI的主动控制方法,通过ORAN和MEC协同降低实时视频流延迟,实验显示在ORAN测试床上实现4 dB PSNR和15点VMAF的提升。

摘要:

当前的自适应比特率(ABR)方法在网络拥堵发生后才作出反应,导致应用层缓冲和实时视频流中的延迟尖峰。我们引入了一个主动的语义控制通道,使开放无线电接入网络(ORAN)xApp、移动边缘计算(MEC)和用户设备(UE)组件之间能够无缝进行实时视频流传输。当传输的UE经历较差的上行(UL)条件时,MEC会根据低层RAN指标,包括每毫秒更新一次的信道SNR,主动进行降级处理,防止缓冲的发生。在MEC中的生成AI模块会在转发至接收UE时通过通常更稳健的下行(DL)链路之前,从降级的视频中重建高质量的帧。在包含50个视频流的实时ORAN测试床上的实验验证显示,我们的方法在减少延迟尾部行为的同时,实现了比反应式ABR方法高达4 dB的PSNR提升和15个点的VMAF提升。主动控制消除了超过600毫秒的延迟尖峰,证明了有效跨层协调以实现低延迟的实时视频流传输。

英文摘要:

Current Adaptive Bit Rate (ABR) methods react to network congestion after it occurs, causing application layer buffering and latency spikes in live video streaming. We introduce a proactive semantic control channel that enables coordination between Open Radio Access Network (ORAN) xApp, Mobile Edge computing (MEC), and User Equipment (UE) components for seamless live video streaming between mobile devices. When the transmitting UE experiences poor Uplink (UL) conditions, the MEC proactively instructs downscaling based on low-level RAN metrics, including channel SNR updated every millisecond, preventing buffering before it occurs. A Generative AI (GAI) module at the MEC reconstructs high-quality frames from downscaled video before forwarding to the receiving UE via the typically more robust Downlink (DL). Experimental validation on a live ORAN testbed with 50 video streams shows that our approach reduces latency tail behavior while achieving up to 4 dB improvement in PSNR and 15 points in VMAF compared to reactive ABR methods. The proactive control eliminates latency spikes exceeding 600 ms, demonstrating effective cross-layer coordination for latency-critical live video streaming.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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