Sherman ChenVice President of Engineering, Broadcom

    A Mathematical Theory of Compressed Video Buffering: Traffic Regulation for End-to-End Video Network QoS
    The recent successes of Over-The-Top (OTT) video services have intensified the competition between the traditional broadcasting video and OTT video. Such competition has pushed the traditional video service providers to accelerate the transition of their video services from the broadcasting video to the carrier-grade IP video streaming.   However, there are significant challenges in providing large-scale carrier-grade IP video streaming services. For a compressed video stream, central to the guaranteed real-time delivery are the issues of video rate, buffering and timing as compressed video pictures are transmitted over an IP network from the encoder output to the decoder input. Towards the understanding and eventual resolution of these issues, a mathematical theory of compressed video buffering has developed and applied to address IP video traffic regulation for the end-to-end video network QoS. In particular, a comprehensive set of theoretical relationships is established for decoder buffer size, network transmission rate, network delay and jitter, and video source characteristics (e.g., burstiness, data rate, and coded picture size). As an example, the theory is applied to measure and compare the burstiness and delay of video streams coded with standards, such as MPEG-2, AVC, HEVC and AV1. The applicability of the theory to IP networks that consist of a specific class of routers is also demonstrated.

    Sherman Chen (aka Xuemin Chen) is the vice president of engineering in the Set-Top Box (STB) and Cable Modem (CM) division of Broadcom Inc. He is responsible for the development and integration of new technologies into System-on-Chips (SoCs), and driving the SoC technology roadmaps for broadband access networks, video delivery systems, home networks, and residential gateway/client devices and solutions.

    Mr. Chen has a Ph. D. degree in Electrical Engineering from University of Southern California.  He is an IEEE fellow and a Broadcom Fellow (designated in 2005), and a prolific inventor of more than 400 issued US patents in the technology areas of digital communication, video processing, information security, broadband access and home networking.  He has published over 80 research articles, reports and book chapters, and three graduate-level textbooks on digital communications, entitled Error-Control Coding for Data Network, Transporting Compressed Digital Videoand Digital Video Transcoding for Transmission and Storage.

    Previously, Dr. Chen served as the vice president of technology and was responsible for Broadband Technology Group (BTG), a technology and system architecture branch in Broadband & Connectivity Business Group of Broadcom Corporation. He led a broad scope of advanced technology development, which includes key SOC architectures for advancing STB and CM devices as well as technologies for enabling xPON[1]CO and CPE[2],xDSL[3]CO and CPE, Small Cell, WiFi access point and connected home products.  Prior to his career in Broadcom, Dr. Chen had held various engineering positions for developing the 1stgeneration of full digital HDTV technologies and image compression algorithms in General Instrument Corporation (later becoming Motorola/Google/Arris due to merger and acquisition) and American Online (Johnson & Grace), respectively.

    [1]PON stands for Passive Optical Network. xPON means different types of PON technologies for high speed (Internet) data services

    [2]CO stands for Central Office while CPE stands for Customer Premises Equipment

    [3]DSL stands for Digital Subscriber Line. xDSL means different types of DSL technologies for high speed (Internet) data services


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