Internet Transport and Coding for 3D HD-TV
„Capacity approaching Multicast Transport of 3D-HD-IPTV“
- „Predictable Reliability and Packet Loss Domain Separation for IP Media Delivery“, Manuel Gorius, Jochen Miroll, Michael Karl and Thorsten Herfet, IEEE International Conference on Communications, Kyoto, 2011
ITC3D project aims at optimized coding, transport and routing of stereoscopic television (3D-TV) video streams in heterogeneous (wired, wireless, multicast-enabled) IP networks.
Our approach is a shift in paradigm from end-to-end transmission mechanisms towards segment-individual transport optimization, which we consider essential for the distribution of delay-critical High-Definition (HD) video content in IP networks. Based on an observation that a network connection between two nodes consists of links or segments with highly heterogeneous characteristics (packet loss and delay), we propose an optimized transmission architecture that explicitly separates packet-loss domains (e.g. wired, wireless). With this separation, network segments inducing a high packet loss do not burden a possibly error-free segment with the overhead introduced for packet loss recovery (ARQ and FEC).
We design an algorithm for adaptive parameter estimation of combined ARQ and FEC coding and show that a higher coding gain can be obtained by spatial refinement of error correction within separate loss domains. We also show that such a separation results in a higher transport efficiency, smaller service delay and less visual artifacts.
With respect to 3D-TV video streaming, ITC3D aims at transmitting stereoscopic video content in a stereo-scalable manner, where a 2D video stream serves as the base layer for a 3D-enhancement stream. In this transmission architecture, a 3D-TV service will be provided in stereoscopy to a subset of the overall number of viewers who have sufficient 3D-capabilities (available bandwidth and rendering hardware). Finding an optimal transport path and an optimal set of segment-individual ARQ and FEC coding parameters for 3D-HDTV transport via multiple synchronous streams is a complex task. ITC3D evaluates the requirements, limitations and performance of such optimized 3D-HDTV transmissions that utilize advanced computer architectures at the sources, the intermediate network nodes and at the receivers.