Layered video multicast transmission system with retransmission-based error recovery
US6148005A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1997 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Oct 9, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2001/0093
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A real-time, layered video multicast transmission system for transmitting video frames as a stream of encoded video data packets from a sender to one or more receivers over a network, comprises a device for generating one or more independent layers of video substreams out of the encoded video stream, each of the one or more receivers capable of subscribing to one or more layers of the independent video substreams; a device for transporting each of the independent video substreams over the network, the transporting device transporting each substream as an independent flow capable of being received by each of the one or more receivers; a device for monitoring congestive state of the network and the receiver to determine receiver's capability for receiving each of the video substream layer; and a controller provided to enable the receivers to select one or more of the independent video streams in accordance with the congestive state of the receiver. For each layer, a retransmission error recovery scheme is also provided to recover lost packets of the multicast stream based on the congestive status of the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.