Wireless communication data rate control prediction method and system

• US 6,847,809 B2
• Filed: 08/23/2002
• Issued: 01/25/2005
• Est. Priority Date: 08/23/2002
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Etkin, Raul Hernan, Gurelli, Mehmet Izzet
• Primary Examiner(s): Nguyen, Duc M.
• Application Number:
  US10/226,470
• Publication Number:
  US 20040038658A1
• Time in Patent Office: 886 Days
• Field of Search: 455/226.3, 455/226.1, 455/226.2, 455/266, 455/67.11, 455/67.13, 455/423, 455/115.1, 455/115.3, 375/221, 375/222, 375/225, 375/227, 375/285, 370/252, 370/343, 370/431, 370/464, 370/476, 702/189, 702/191
• US Class Current: 455/226.3
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0036 arrangements specific to the receiver
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

Systems and methods for predicting the signal-to-interference-and-noise ratio (SINR) of the signal to be received by a mobile station transmitted from a base station in a wireless data communications system, for the purpose of forward link data rate control in the presence of partly periodic SINR fluctuations. The invention involves determination of a periodic mean SINR component in the received SINR process, and upon such determination the activation of a method which comprises a periodic mean SINR estimator, a subtractor which subtracts the periodic component from the received SINR process to produce an intermediate SINR process, a generic predictor which may be used to perform predictions on the intermediate SINR process, an adder which adds back an appropriate mean value to the intermediate SINR prediction. The resulting final SINR prediction is then used for rate selection.

Claims

1. A signal-to-interference-and-noise ratio (SINR) prediction method for dynamic rate selection in a wireless data communications system, comprising:

detecting a periodic mean SINR component in a regularly measured SINR process based on a received signal from a base station;

activating, after said detecting, a periodic mean SINR estimation;

subtracting the estimated periodic mean SINR estimation from the measured SINR process to obtain an intermediate SINR;

performing intermediate prediction on the intermediate SINR to obtain an intermediate predicted SINR;

adding, after a delay period, an average of the estimated mean periodic SINR to the intermediate SINR prediction to obtain a final SINR prediction;

applying a dynamically determined backoff amount based on the final SINR prediction to control the packet error rate in said wireless data communications system.

2. An apparatus for a signal-to-interference-and-noise ratio (SINR) prediction for dynamic rate selection in a wireless data communications system, comprising:

means for detecting a periodic mean SINR component in a regularly measured SINR process based on a received signal from a base station;

means for activating, after said detecting, a periodic mean SINR estimation;

means for subtracting the estimated periodic mean SINR estimation from the measured SINR process to obtain an intermediate SINR;

means for performing intermediate prediction on the intermediate SINR to obtain an intermediate predicted SINR;

means for adding, after a delay period, an average of the estimated mean periodic SINR to the intermediate SINR prediction to obtain a final SINR prediction;

means for applying a dynamically determined backoff amount based on the final SINR prediction to control the packet error rate in said wireless data communications system.