Method and system for estimating a communication mode quality in a wireless communications system

• US 5,991,618 A
• Filed: 05/29/1998
• Issued: 11/23/1999
• Est. Priority Date: 05/29/1998
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Hall, Scott Maurice
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Jackson, Blane J.
• Application Number:
  US09/087,029
• Time in Patent Office: 543 Days
• Field of Search: 455/522, 455/506, 455/505, 455/504, 455/501, 455/437, 455/425, 455/423, 455/422, 455/67.5, 455/67.3, 455/67.1, 455/63, 455/13.4, 455/10, 455/9, 455/115, 370/318, 375/224, 375/227
• US Class Current: 455/425
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04W 52/226 using past references to control power, e.g. look-up-table
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/288 taking into account the usage mode, e.g. hands-free, data transmission, telephone
• CPC Class Codes: H04W 52/343 taking into account loading or congestion level
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment

Abstract

In a wireless communications system, a subscriber unit transmit power is determined. Thereafter, a power margin is determined by subtracting the subscriber unit transmit power from a maximum transmit power. In response to a current communication mode of the subscriber unit, a predetermined power margin requirement for the current communication mode, and the current power margin, a communication mode quality is estimated. Either the power margin or communication mode quality may be indicated at the subscriber unit, or reported to the infrastructure of the wireless communications system. In response to an unsatisfactory power margin or communication mode quality, the infrastructure may make adjustments to improve service.

Claims

1. A method for estimating a communication mode quality for a subscriber unit in a wireless communication system service area, the method comprising the steps of:

determining a subscriber unit transmit power;

subtracting the subscriber unit transmit power from a maximum transmit power to determine a power margin;

determining a current communication mode; and

estimating the communication mode quality in response to a predetermined power margin requirement of the current communication mode and the power margin.

2. The method for estimating a communication mode quality according to claim 1 wherein the communication mode quality is directly proportional to the power margin.

3. The method for estimating a communication mode quality according to claim 1 wherein a current communication mode further includes a communicating mode having a selected data rate.

4. The method for estimating a communication mode quality according to claim 1 wherein a current communication mode further includes a communication mode that uses more than one traffic channel.

5. The method for estimating a communication mode quality according to claim 1 further including the step of indicating the power margin.

6. The method for estimating a communication mode quality according to claim 1 further including the steps of:

detecting a request for a change to a next communication mode;

estimating a next communication mode quality in response to a predetermined power margin requirement of the next communication mode and the power margin; and

denying the change to the next communication mode if the estimated next communication mode quality is below a predetermined threshold.

7. The method for estimating a communication mode quality according to claim 6 further including the step of reporting to a wireless communication system infrastructure that the subscriber unit denied a change to the next communication mode.

8. The method for estimating a communication mode quality according to claim 7 further including the step of making adjustments at the infrastructure in response to the reporting that the subscriber unit denied a change to the next communication mode.

9. A system for estimating a communication mode quality for a subscriber unit in a wireless communication system service area comprising:

means for determining a subscriber unit transmit power;

means for subtracting the subscriber unit transmit power from a maximum transmit power to determine a power margin;

means for determining a current communication mode; and

means for estimating the communication mode quality in response to a predetermined power margin requirement of the current communication mode and the power margin.

10. The system for estimating a communication mode quality according to claim 9 wherein the communication mode quality is directly proportional to the power margin.

11. The system for estimating a communication mode quality according to claim 9 wherein a current communication mode further includes a communication mode having a selected data rate.

12. The system for estimating a communication mode quality according to claim 9 wherein a current communication mode further includes a communication mode that uses more than one traffic channel.

13. The system for estimating a communication mode quality according to claim 9 further including means for indicating the power margin.

14. The system for estimating a communication mode quality according to claim 9 further including:

means for detecting a request for a change to a next communication mode;

means for estimating a next communication mode quality in response to a predetermined power margin requirement of the next communication mode and the power margin; and

means for denying the change to the next communication mode if the estimated next communication mode quality is below a predetermined threshold.

15. The system for estimating a communication mode quality according to claim 14 further including means for reporting to a wireless communication system infrastructure that the subscriber unit denied a change to the next communication mode.

16. The system for estimating a communication mode quality according to claim 15 further including means for making adjustments at the infrastructure in response to the reporting that the subscriber unit denied a change to the next communication mode.

17. A system for estimating a communication mode quality in a subscriber unit of a wireless communications system comprising:

a power amplifier;

a power measurer coupled to the power amplifier for providing a power measurement;

a maximum power indicator for providing a maximum power value, wherein the maximum power value limits the output power of the power amplifier;

a summer for subtracting the power measurement from the maximum power value to calculate a power margin; and

a communication mode quality estimator for estimating a communication mode quality in response to the power margin.

18. The system for estimating a communication mode quality in according to claim 17 further comprising a power margin indicator for indicating the power margin.

19. The system for estimating a communication mode quality in according to claim 17 wherein the power measurer is coupled to the output of the power amplifier for providing a power measurement.

20. The system for estimating a communication mode quality in according to claim 17 wherein the power measurer is coupled to a register in a power controller of the power amplifier for providing a power measurement.