Adaptive rate prioritizing

• US 7,369,549 B2
• Filed: 03/25/2003
• Issued: 05/06/2008
• Est. Priority Date: 03/25/2003
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Black, Peter J., Wu, Qiang
• Primary Examiner(s): Phan; Man U.
• Application Number:
  US10/397,989
• Publication Number:
  US 20040190507A1
• Time in Patent Office: 1,869 Days
• Field of Search: 370229-252, 370328-335, 370347-352, 370436-465, 455452-522
• US Class Current: 370/389
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0007 by modifying the frame length
• CPC Class Codes: H04L 1/0019 in which mode-switching is based on a statistical approach
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication

Abstract

Systems and techniques are disclosed relating to communications. The systems and techniques involve measuring a quality of a transmission from a remote location, identifying a data rate as a function of the measured quality, the identified data rate being capable of supporting a plurality of packet lengths, selecting one of the packet lengths as a function of a parameter of the measured quality, and providing feedback to the remote location, the feedback relating to the data rate and the selected one of the packet lengths. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or the meaning of the claims.

Claims

1. A method of communications comprising:

measuring a quality of a transmission from a remote location, the measurement comprising a quality metric;

identifying a data rate as a function of the measured quality, the identified data rate supporting a plurality of packet lengths;

computing a quality metric prediction value for each of the packet lengths based on the quality metric measurement;

selecting one of the packet lengths as a function of a parameter of the measured quality; and

providing feedback to the remote location, the feedback relating to the data rate and the selected one of the packet lengths.

2. The method of claim 1 wherein the quality metric is measured over time.

3. The method of claim 2 wherein the quality metric comprises a signal-to-interference and noise ratio.

4. The method of claim 1 wherein the parameter comprises a standard deviation of the quality metric measurement.

5. The method of claim 4 wherein the selection of the one of the packet lengths comprises comparing the standard deviation to a threshold.

6. The method of claim 5 wherein the threshold is a function of a probability of gain from an early termination of a subsequent transmission having the selected one of the packet lengths.

7. The method of claim 4 wherein the packet lengths comprise a first packet length and a second packet length longer than the first packet length, and wherein the selection of the one of the packet lengths comprises selecting the first packet length if the standard deviation is below a threshold.

8. The method of claim 4 wherein the packet lengths comprise a first packet length and a second packet length longer than the first packet length, and wherein the selection of the one of the packet length comprises selecting the second packet length if the standard deviation is above a threshold.

9. The method of claim 1 wherein the feedback comprises an index corresponding to the data rate and the selected one of the packet lengths.

10. A communications apparatus, comprising:

a receiver configured to receive a transmission from a remote location;

a processor configured to measure a quality of the transmission, the measurement comprising a quality metric, identify a data rate as a function of the measured quality, the identified data rate supporting a plurality of packet lengths, compute a quality metric prediction value for each of the packet lengths based on the quality metric measurement, and select one of the packet lengths as a function of a parameter of the measured quality; and

a transmitter configured to transmit feedback to the remote location, the feedback relating to the data rate and the selected one of the packet lengths.

11. The communications apparatus of claim 10 wherein the processor is further configured to measure the quality metric over time.

12. The communications apparatus of claim 11 wherein the quality metric comprises a signal-to-interference and noise ratio.

13. The communications apparatus of claim 10 wherein the parameter comprises a standard deviation of the quality metric measurement.

14. The communications apparatus of claim 13 wherein the processor is further configured to select the one of the packet lengths by comparing the standard deviation to a threshold.

15. The communications apparatus of claim 14 wherein the threshold is a function of a probability of gain from an early termination of a subsequent transmission from the remote location having the selected one of the packet lengths.

16. The communications apparatus of claim 13 wherein the packet lengths comprise a first packet length and a second packet length longer than the first packet length, and wherein the processor is further configured to select the first packet length if the standard deviation is below a threshold.

17. The communications apparatus of claim 13 wherein the packet lengths comprise a first packet length and a second packet length longer than the first packet length, and wherein the processor is further configured to select second packet length if the standard deviation is above a threshold.

18. The communications apparatus of claim 10 wherein the feedback comprises an index corresponding to the data rate and the selected one of the packet lengths.

19. A communications apparatus, comprising:

means for measuring a quality of a transmission from a remote location the measurement comprising a quality metric;

means for identifying a data rate as a function of the measured quality, the identified data rate supporting a plurality of packet lengths;

means for computing a quality metric prediction value for each of the packet lengths based on the quality metric measurement;

means for selecting one of the packet lengths as a function of a parameter of the measured quality; and

means for providing feedback to the remote location, the feedback relating to the data rate and the selected one of the packet lengths.

20. A program on a computer readable medium comprising:

code for causing a computer to measure a quality of a transmission from a remote location, the measurement comprising a quality metric;

code for causing a computer to identify a data rate as a function of the measured quality, the identified data rate supporting a plurality of packet lengths;

code for causing a computer to compute a quality metric prediction value for each of the packet lengths based on the quality metric measurement;

code for causing a computer to select one of the packet lengths as a function of a parameter of the measured quality; and

code for causing a computer to provide feedback to the remote location, the feedback relating to the data rate and the selected one of the packet lengths.