Compensating delay of channel state information between receiver and transmitter during adaptive video delivery

• US 20090219992A1
• Filed: 06/30/2006
• Published: 09/03/2009
• Est. Priority Date: 08/04/2005
• Status: Abandoned Application

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Wang, Charles Chunaming
• Application Number:
  US11/989,674
• Publication Number:
  US 20090219992A1
• Time in Patent Office: Days
• US Class Current: 375/240.30
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/373 Predicting channel quality or other radio frequency [RF] parameters
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0014 by adapting the source coding
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication

Abstract

A method for controlling transmission of video data in a network, including: transmitting video data to a receiver via the network; receiving channel parameter information measured by the receiver; applying a predictive function to the channel parameter information to compensate for delay times in receiving the channel parameter information from the receiver, and generating a feedback function; and adjusting the video data to be transmitted in response to the feedback function to compensate for network conditions.

Claims

1. A method for controlling transmission of video data in a network, comprising:

transmitting video data to a receiver via the network;

receiving channel parameter information measured by the receiver;

applying a predictive function to the channel parameter information to compensate for delay times in receiving the channel parameter information from the receiver, and generating a feedback function; and

adjusting the video data to be transmitted in response to the feedback function to compensate for network conditions.

2. The method of claim 1, wherein the predictive function is based on a statistical model of the network conditions.

3. The method of claim 1, wherein the network is a WLAN.

4. The method of claim 1, wherein the adjusting step comprises adjusting quantization parameters in the video encoder.

5. The method of claim 1, wherein the adjusting step comprises adjusting error correction data included in the video data stream.

6. A system for controlling transmission of video data in a network, comprising:

a transmitter for generating a video data stream and transmitting the video data stream over the network;

a receiver for receiving the video data stream over the network, the receiver measuring channel parameter information associated with the transmission and transmitting the channel parameter information to the transmitter via a feedback channel, the transmitter including a controller for receiving the channel parameter information from the receiver, the controller applying a predictive function to the channel parameter information to generate a feedback function and adjusting the video data stream in response to the predictive function and channel parameter information.

7. The system of claim 6, wherein the predictive function is based on a statistical model of the network conditions.

8. The system of claim 6, wherein the network is a WLAN.

9. The system of claim 6, wherein the controller adjusts quantization parameters in the video encoder.

10. The system of claim 6, wherein the controller adjusts error correction data included in the video data stream.

11. A transmitter for providing streaming video to a receiver via a network, the transmitter comprising:

an encoder having an output;

a traffic shaper having an input coupled to the output of the encoder;

a controller coupled to at least one of the encoder and traffic shaper; and

,

wherein, the controller predictively modifies the operation of at least one of the encoder and traffic shaper according to a channel model and at least one actual parameter of the network.

12. The transmitter of claim 11, wherein the controller predictively modifies based on a statistical model of the network conditions.

13. The transmitter of claim 12, wherein the controller is coupled to both the encoder and traffic shaper.

14. The transmitter of claim 13, wherein the controller modifies the operation of both the encoder and traffic shaper.

15. The transmitter of claim 11, wherein the at least one actual parameter of the network comprises at least one parameter indicative of channel quality.

16. The transmitter of claim 11, wherein the at least one actual parameter of the network comprises at least one parameter indicative of a bit error rate.

17. The transmitter of claim 11, wherein the model comprises a plurality of models, wherein one of the models in indicative of network feed forward delay and another of the models is indicative of network feed-back delay.

18. The transmitter of claim 11, further comprising a source of digital video data coupled to the encoder.

19. The transmitter of claim 11, wherein the network is a WLAN.