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Adaptive information delivery system using FEC feedback

A secondary feedback, transmission rate technology, applied in transmission systems, digital transmission systems, error detection/prevention using signal quality detectors, etc., can solve problems such as packet loss

Inactive Publication Date: 2008-02-13
TERAYON COMM SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Although various rate adaptation systems have been devised, these systems are typically designed to adapt based on packet loss at the client system, resulting in end users periodically experiencing unacceptable data quality (e.g., dropped, frozen frame, etc.) cycle

Method used

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  • Adaptive information delivery system using FEC feedback
  • Adaptive information delivery system using FEC feedback
  • Adaptive information delivery system using FEC feedback

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Embodiment Construction

[0033] Data channels are subject to errors caused by various time-varying sources such as external noise or interference, router congestion, link congestion, etc., all of which result in a time-varying error rate associated with the channel. This time-varying error rate controls the allowable data transfer rate of the channel. If the data transfer rate through the channel is low enough, the data can be transferred without errors. However, as the transfer rate through the channel increases, the resulting rate will be high enough that the error characteristics of the channel will cause data to be corrupted or lost. Therefore, the error rate of the channel establishes the error threshold.

[0034] Figure 1 graphically illustrates the concept of error thresholds (eg, line 101). As shown, the error threshold varies over time. As long as the transfer rate remains below the error threshold 101, the data transfer is error-free. Every time the transfer rate exceeds the threshold 10...

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Abstract

A method and apparatus for optimizing the data transfer rate over a transport layer (i.e., communication link) such as the Internet is provided. Initially the data is prepared for transmission by a transfer rate controller, then the data is encoded by a Forward Error Correction (FEC) encoder. After the data has been transferred over the transport layer, the quality of the data transfer link is assessed by an FEC decoder that determines if any errors occurred during data transfer and if errors are detected, the magnitude of the errors (i.e., FEC-correctable packets, FEC-uncorrectable packets). This information is used to generate a feedback message which is used by the transfer rate controller to adjust and optimize the data transfer rate for the link quality as determined at that point in time. By continually monitoring and assessing link quality and providing feedback to the transfer rate controller, the transfer rate can be continually adapted to the varying link quality. In addition to generating feedback used by the transfer rate controller to optimize data transfer rate, the FEC decoder can generate feedback that is used by the FEC encoder to optimize the FEC algorithm. If desired, feedback from the FEC decoders within the link layer demodulator and / or feedback from the receiver can be used to augment the feedback generated by the FEC decoder.

Description

technical field [0001] The present invention relates generally to data transmission systems, and more particularly to methods and apparatus for improving the quality of information transmitted over data transmission systems. Background technique [0002] The Internet was originally developed for the transfer of bulk data (such as files and e-mail) in small segments, often called packets. While intended to be a best-effort delivery system that never guarantees delivery of individual packets, it is nonetheless designed to be very resilient, providing a means for routing around individual components should they fail. [0003] In recent years, the Internet has enjoyed a wide reputation due in part to the development of various high-speed data transfer technologies. Even with these high speed technologies, transferring large data files (eg, long documents, video files, audio files, etc.) can still be very time consuming. For example, downloading a movie over a standard DSL line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/00
CPCH04N7/66H04L1/0045H04L1/0036H04L1/0009H04N19/00927H04L1/20H04L1/0026H04N19/88
Inventor 法布里斯·米歇尔·雷蒙德·基纳尔罗伯特·詹姆斯·凡泰利保罗·艾伦·林德
Owner TERAYON COMM SYST