Power adaptation based on error rate

• US 9,913,223 B2
• Filed: 06/22/2015
• Issued: 03/06/2018
• Est. Priority Date: 06/22/2015
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Narang, Mohit, Agboh, Peter M., Wu, Qiyang, Caballero, Ruben, Reddy, Vusthla Sunil, Yang, Xi
• Primary Examiner(s): Thompson, Jr., Otis L
• Application Number:
  US14/746,133
• Publication Number:
  US 20160374028A1
• Time in Patent Office: 988 Days
• Field of Search: None
• CPC Class Codes: H04L 43/0847 Transmission error
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04W 4/80 Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/246 where the output power of a terminal is based on a path parameter calculated in said terminal
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

A host device is configured to increase the power output by an internal amplifier of its wireless chipset in response to requests from a remote device coupled via a data link. Once the internal amplifier has reached its maximum power, the host device may determine the strength of the data link between it and the remote device. If the strength is low, it is an indication that further increases in signal power by the host device may have little effect on the link. If the signal strength from the remote device is sufficient, the host device determines an error rate. If the error rate is sufficiently low, the host device will not increase its signal output power. However, if the error rate is too high, the host device may increase power from its external amplifier to improve the error rate of the data link.

Claims

1. An electronic device configured to communicate via a wireless communications link with a remote device, comprising:

an input/output interface having a wireless module comprising;

a wireless chipset configured to generate a radio frequency signal and having an internal amplifier configured to amplify the radio frequency signal; and

an external amplifier operatively coupled to the wireless chipset and configured to further amplify the radio frequency signal; and

a processor configured to;

determine whether the internal amplifier is at a maximum amplification level in response to receiving a request from the remote device to increase power of the radio frequency signal;

if the internal amplifier is not at the maximum amplification level, increase the amplification level of the internal amplifier in response to the request to increase power; and

if the internal amplifier is at the maximum amplification level, determine an error rate of the communications link, determine a strength of a signal received by the electronic device from the remote device, and managing the external amplifier based at least in part on the error rate and on the signal strength, wherein managing the external amplifier comprises turning on, turning off, increasing the power, decreasing the power, or maintaining the power of the external amplifier.

2. The electronic device, as set forth in claim 1, wherein the wireless communications link comprises a Bluetooth communications link.

3. The electronic device, as set forth in claim 1, wherein the processor is configured to:

determine if the error rate is above an upper boundary;

if the error rate is above the upper boundary, determine whether the strength of the signal received by the electronic device from the remote is below a threshold;

if the strength of the received signal is below the threshold, then not further amplify the radio frequency signal; and

if the strength of the received signal is not below the threshold, then increase power of the external amplifier to further amplify the radio frequency signal.

4. The electronic device, as set forth in claim 3, wherein the processor is configured to:

if the error rate is not above the upper boundary, determine if the error rate is below a lower boundary;

if the error rate is below the lower boundary, then determine whether the amplification level of the external amplifier is at its minimum level;

if it is at its minimum level, then turn off the external amplifier; and

if it is not at its minimum level, then decrease power of the external amplifier.

5. The electronic device, as set forth in claim 1, wherein the processor is configured to:

if the internal amplifier is at the maximum level, determine whether the strength of the signal received by the electronic device from the remote device is below a threshold;

if the strength of the received signal is below the threshold, then not further amplify the radio frequency signal; and

if the strength of the received signal is not below the threshold, then determine whether the error rate is sufficient to maintain the communications link;

if so, then not further amplify the radio frequency signal;

if not, then increase power of the external amplifier to further amplify the radio frequency signal.

6. The electronic device, as set forth in claim 5, wherein the processor is configured to:

if the error rate is sufficient to maintain the communications link, then determine whether the amplification level of the external amplifier is at its minimum level;

if it is at its minimum level, then turn off the external amplifier; and

if it is not at its minimum level, then decrease power of the external amplifier.

7. A method for controlling the power of a radio frequency signal generated by an electronic device wirelessly communicating via a communications link with a remote device, the method comprising:

receiving at the electronic device a request for more power from the remote device;

when an internal amplifier of a wireless chipset generating the radio frequency signal of the electronic device is at a maximum amplification level, determining an error rate of the communications link and a strength of a signal received by the electronic device from the remote device; and

when an internal amplifier of a wireless chipset generating the radio frequency signal of the electronic device is at a maximum amplification level, determining whether to increase a power of an amplifier of the electronic device external to the wireless chipset based at least in part on the error rate and on the signal strength.

8. The method, as set forth in claim 7, wherein the communications link comprises a Bluetooth communications link.

9. The method, as set forth in claim 7, wherein the step of determining whether to increase the power of the amplifier comprises:

determining if the error rate is above an upper boundary;

if the error rate is above the upper boundary, determining whether the strength of the signal received by the electronic device from the remote device is below a threshold;

if the strength of the received signal is below the threshold, then not further amplifying the radio frequency signal; and

if the strength of the received signal is not below the threshold, then increasing power of the external amplifier to further amplify the radio frequency signal.

10. The method, as set forth in claim 9, wherein the step of determining whether to increase the power of the amplifier comprises:

if the error rate is not above the upper boundary, determining if the error rate is below a lower boundary;

if the error rate is below the lower boundary, then determining whether the amplification level of the external amplifier is at its minimum level;

if it is at its minimum level, then turning off the external amplifier; and

if it is not at its minimum level, then decreasing power of the external amplifier.

11. The method, as set forth in claim 7, wherein the step of determining whether to increase the power of the amplifier comprises:

if the internal amplifier is at the maximum level, determining whether the strength of the signal received by the electronic device from the remote device is below a threshold;

if the strength of the received signal is below the threshold, then not further amplifying the radio frequency signal; and

if the strength of the received signal is not below the threshold, then determining whether the error rate is sufficient to maintain the communications link;

if so, then not further amplifying the radio frequency signal;

if not, then increasing power of the external amplifier to further amplify the radio frequency signal.

12. The method, as set forth in claim 11, wherein the step of determining whether to increase the power of the amplifier comprises:

if the error rate is sufficient to maintain the communications link, then determining whether the amplification level of the external amplifier is at its minimum level;

if it is at its minimum level, then turning off the external amplifier; and

if it is not at its minimum level, then decreasing power of the external amplifier.

13. A tangible, non-transitory computer readable medium having instructions that when executed by a processor of an electronic device in wireless communication with a remote device via a communications link cause the electronic device to:

determine whether an internal amplifier of a wireless chipset generating a radio frequency signal of the electronic device is at a maximum amplification level in response to the electronic device receiving a request for more power from a remote device;

if the internal amplifier is not at the maximum amplification level, increase the amplification level of the internal amplifier in response to the request for more power; and

if the internal amplifier is at the maximum amplification level, determine an error rate of the communications link and a strength of a signal received by the electronic device from the remote device and determine whether to increase a power of an external amplifier of the electronic device in response to the request for more power based at least in part on the error rate and the strength of the received signal.

14. The medium, as set forth in claim 13, wherein the communications link comprises a Bluetooth communications link.

15. The medium, as set forth in claim 13, wherein the instructions cause the electronic device to:

determine if the error rate is above an upper boundary;

if the error rate is above the upper boundary, determine the strength of a signal received by the electronic device from the remote device and determining whether it is below a threshold;

if the strength of the received signal is below the threshold, then not further amplify the radio frequency signal; and

if the strength of the received signal is not below the threshold, then increase power of the external amplifier to further amplify the radio frequency signal.

16. The medium, as set forth in claim 15, wherein the instructions cause the electronic device to:

if the error rate is not above the upper boundary, determine if the error rate is below a lower boundary;

if the error rate is below the lower boundary, then determine whether the amplification level of the external amplifier is at its minimum level;

if it is at its minimum level, then turn off the external amplifier; and

if it is not at its minimum level, then decrease power of the external amplifier.

17. The medium, as set forth in claim 13, wherein the instructions cause the electronic device to:

if the internal amplifier is at the maximum level, determine the strength of a signal received by the electronic device from the remote device and determine whether it is below a threshold;

if the strength of the received signal is below the threshold, then not further amplify the radio frequency signal; and

if the strength of the received signal is not below the threshold, then determine whether the error rate is sufficient to maintain the communications link;

if so, then not further amplify the radio frequency signal;

if not, then increase power of the external amplifier to further amplify the radio frequency signal.

18. The medium, as set forth in claim 17, wherein the instructions cause the electronic device to:

if the error rate is sufficient to maintain the communications link, then determine whether the amplification level of the external amplifier is at a minimum level;

if it is at the minimum level, then turn off the external amplifier; and

if it is not at the minimum level, then decrease power of the external amplifier.

19. A method for controlling the power of a radio frequency signal generated by an electronic device wirelessly communicating via a communications link with a remote device, the method comprising:

receiving at the electronic device a request for more power from the remote device;

determining whether an internal amplifier of a wireless chipset generating the radio frequency signal of the electronic device is at a maximum amplification level;

if not, increasing the amplification level of the internal amplifier in response to the request for more power;

if so, determining an error rate for the communications link and determining if the error rate is above an upper boundary;

if the error rate is above the upper boundary, determining the strength of a signal received by the electronic device from the remote device and determining whether it is below a threshold;

if the strength of the received signal is below the threshold, then not further amplifying the radio frequency signal;

if the strength of the received signal is not below the threshold, then increasing power of the external amplifier to further amplify the radio frequency signal;

if the error rate is not above the upper boundary, determining if the error rate is below a lower boundary;

if the error rate is below the lower boundary, then determining whether the amplification level of the external amplifier is at its minimum level;

if it is at its minimum level, then turning off the external amplifier; and

if it is not at its minimum level, then decreasing power of the external amplifier.

20. The method, as set forth in claim 19, wherein the communications link comprises a Bluetooth communications link.

21. The method, as set forth in claim 19, wherein the error rate comprises an average error rate of the communications link.

22. The method, as set forth in claim 19, wherein the error rate comprises a retransmission rate of the communications link.

23. A system comprising an electronic device configured to communicate wirelessly with a remote device via a communications link, wherein the electronic device comprises a processor and a memory device comprising instructions that cause the processor to:

receive at the electronic device a request for more power from the remote device;

determine whether an internal amplifier of a wireless chipset generating the radio frequency signal of the electronic device is at a maximum amplification level;

if not, increase the amplification level of the internal amplifier in response to the request for more power;

if so, determine an error rate for the communications link and determining if the error rate is above an upper boundary;

if the error rate is above the upper boundary, determine the strength of a signal received by the electronic device from the remote device and determining whether it is below a threshold;

if the strength of the received signal is below the threshold, then not further amplify the radio frequency signal;

if the strength of the received signal is not below the threshold, then increase power of the external amplifier to further amplify the radio frequency signal;

if the error rate is not above the upper boundary, determine if the error rate is below a lower boundary;

if the error rate is below the lower boundary, then determine whether the amplification level of the external amplifier is at its minimum level;

if it is at its minimum level, then turn off the external amplifier; and

if it is not at its minimum level, then decrease power of the external amplifier.

24. The method, as set forth in claim 23, wherein the communications link comprises a Bluetooth communications link.

25. The method, as set forth in claim 23, wherein the error rate comprises an average error rate of the communications link.

26. The method, as set forth in claim 23, wherein the error rate comprises a retransmission rate of the communications link.