Patent EA-002893-B1 (EA)
Title: Forward and reverse link power control using position and mobility information
Inventor: SOLIMAN SAMIR S
IPC: H04B7/26
Filed: 1999-11-30
Abstract: 1. A method for reverse link power control between a mobile station and at least one base station in a CDMA wireless communication system characterized by a reverse link power control loop, the method comprising: identifying a current position of the mobile station; identifying a current velocity of the mobile station using the current position information; and dynamically adjusting reverse link power control loop parameters on the basis of at least one of the current position and current velocity, the power control loop parameters including at least one of an upper limit signal to noise ratio (SNR), a lower limit SNR, and a power adjustment step size. 2. The method of Claim 1, wherein dynamically adjusting involves: selecting the at least one upper limit SNR and lower limit SNR on the basis of the current position; and adjusting the selected upper and lower limit SNRs on the basis of the current velocity. 3. The method of Claim 2, wherein the selecting and adjusting is performed using predefined look-up tables. 4. The method of Claim 3, wherein a geographic cell is characterized by a plurality of different regions serviced by a base station, the step of identifying a current position involves identifying a region in the cell the mobile station is presently located. 5. The method of Claim 2, wherein a geographic cell is characterized by a plurality of different regions serviced by a base station, and the step of identifying a current position involves identifying a region in the cell the mobile station is presently located. 6. The method of Claim 1, wherein a geographic cell is characterized by a plurality of different regions serviced by a base station, and the step of identifying a current position involves identifying a region in the cell the mobile station is presently located. 7. The method of Claim 2, wherein the identifying of the current position is determined using differential GPS. 8. The method of Claim 2, wherein the identifying of the current position is determined using terrestrial base stations, alone or in combination with GPS information. 9. The method of Claim 2, wherein dynamically adjusting the power control loop parameters further involves using the current velocity to redefine the power adjustment step. 10. The method of Claim 9, wherein the step of identifying current velocity is determined by modeling, using the current position and at least one of past positional measurements, map information, and filtering. 11. The method of Claim 10, wherein the redefining of the power adjustment step involves identifying a range of velocities including the current velocity, and determining an associated power adjustment step associated with the identified range using a predefined look-up table. 12. The method of Claim 1, wherein dynamically adjusting the power control loop parameters involves using the current velocity to redefine the power adjustment step. 13. The method of Claim 12, wherein the step of identifying the current velocity is determined by modeling, using the current position and at least one of past positional measurements, map information, and filtering. 14. The method of Claim 13, wherein the redefining of the power adjustment step involves identifying a range of velocities including the current velocity, and determining an associated power adjustment step associated with the identified range using a predefined look-up table. 15. The method of Claim 14, wherein a geographic cell is characterized by plurality of different regions serviced by a base station, the step of identifying a current position involves identifying a region in the cell the mobile station is presently located. 16. A method for forward link power control between a base station and at least one mobile station in a CDMA wireless communication system characterized by a forward link power control loop, the method comprising: identifying a current position of the mobile station; identifying a current velocity of the mobile station using the current position information; and dynamically adjusting forward link power control loop parameters on the basis of at least one of the current position and current velocity, the power control loop parameters including at least one of an upper limit power level, a lower limit power level and a power adjustment step size. 17. The method of Claim 16, wherein dynamically adjusting involves: selecting the at least one upper limit power level and lower limit power level on the basis of the current position; and adjusting the selected upper and lower limit power levels on the basis of the current velocity. 18. The method of Claim 17, wherein the selecting and adjusting is performed using predefined look-up tables. 19. The method of Claim 18, wherein a geographic cell is characterized by a plurality of different regions serviced by a base station, the step of identifying a current position involves identifying a region in the cell the mobile station is presently located. 20. The method of Claim 17, wherein a geographic cell is characterized by a plurality of different regions serviced by a base station, the step of identifying a current position involves identifying a region in the cell the mobile station is presently located. 21. The method of Claim 16, wherein a geographic cell is characterized by a plurality of different regions serviced by a base station, the step of identifying a current position involves identifying a region in the cell the mobile station is presently located. 22. The method of Claim 17, wherein the identifying of the current position is determined using differential GPS. 23. The method of Claim 17, wherein the identifying of the current position is determined using terrestrial base stations, alone or in combination with GPS information. 24. The method of Claim 17, wherein dynamically adjusting the power control loop parameters further involves using the current velocity to redefine the power adjustment step. 25. The method of Claim 24, wherein the step of identifying current velocity is determined by modeling, using the current position and at least one of past positional measurements, map information, and filtering. 26. The method of Claim 25, wherein the redefining of the power adjustment step involves identifying a range of velocities including the current velocity, and determining an associated power adjustment step associated with the identified range using a pre-defined look-up table. 27. The method of Claim 26, wherein dynamically adjusting the power control loop parameters involves using the current velocity to redefine the power adjustment step. 28. The method of Claim 27, wherein the step of identifying current velocity is determined by modeling, using the current position and at least one of past positional measurements, map information, and filtering. 29. The method of Claim 28, wherein the redefining of the power adjustment step involves identifying a range of velocities including the current velocity, and determining an associated power adjustment step associated with the identified range using a pre-defined look-up table. 30. The method of Claim 29, wherein a geographic cell is characterized by plurality of different regions serviced by a base station, the step of identifying a current position involves identifying a region in the cell the mobile station is presently located.