METHOD AND SYSTEM FOR MANAGING TRANSMIT POWER ON A WIRELESS COMMUNICATION NETWORK

• US 20140126440A1
• Filed: 11/05/2012
• Published: 05/08/2014
• Est. Priority Date: 11/05/2012
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Frank, Colin D., Brown, Tyler A., Krishnamurthy, Sandeep H.
• Granted Patent: US 9,220,070 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

The present disclosure sets forth multiple embodiments of the invention. Among those embodiments is a method for determining a maximum power reduction of an uplink signal. The uplink signal is transmitted on a carrier that has a range of frequencies. Frequencies outside of the carrier frequency range include adjacent channel regions. Resource blocks of the carrier that have been allocated for use by to transmit the uplink signal are identified. A power spectral density is determined based on the identified resource blocks. A metric that is based on a third order convolution of the power spectral density function is determined. A maximum power reduction for the adjacent channel regions is also determined based on the metric.

Claims

1. A method for determining a maximum power reduction of an uplink signal, the uplink signal being transmitted on a carrier, the carrier having a range of frequencies, wherein frequencies outside of the carrier frequency range include adjacent channel regions, the method comprising:

identifying resource blocks of the carrier that have been allocated for use by to transmit the uplink signal;

determining, based on the identified resource blocks, a power spectral density;

determining a metric, the metric being based on a third order convolution of the power spectral density function; and

determining a maximum power reduction for the adjacent channel regions based on the determined metric.

2. The method of claim 1, wherein determining a metric comprises:

determining a function based on the third order convolution; and

determining the metric based on an integral of the determined function over frequency intervals of the adjacent channel regions.

3. The method of claim 1, wherein determining a maximum power reduction comprises:

referencing a map of a metric to a maximum power reduction; and

based on the referencing step, determining the maximum power reduction that corresponds to the determined metric.

4. The method of claim 1, wherein frequencies outside of the adjacent channel regions include spurious regions, wherein the determined metric is a first metric, wherein the determined function is a first function, the method further comprising,

determining a second function, the second function being based on a fifth order convolution of a function of the power spectral density;

determining a second metric, the second metric being based on an integral of the second function over frequency intervals of the spurious regions

determining a maximum power reduction for the spurious regions based on the determined second metric.

5. The method of claim 4, wherein determining the second metric comprises:

referencing a map of a metric to a maximum power reduction;

based on the referencing step, determining the maximum power reduction that is mapped to the determined second metric.

6. The method of claim 4, further comprising determining the maximum of the adjacent channel maximum power reduction and the spurious region maximum power reduction.

7. The method of claim 2, wherein a first portion of the adjacent channel regions is at a lower frequency than the carrier, and a second portion of the adjacent channel regions is at a higher frequency than the carrier.

8. The method of claim 1, further comprising setting an uplink power based on the determined maximum power reduction.

9. The method of claim 1, further comprising computing a maximum configured power based on the determined maximum power reduction.

10. The method of claim 1, further comprising computing a power headroom based on the determined maximum power reduction.

11. A method for determining a maximum power reduction of an uplink signal, the uplink signal being transmitted on a carrier, the carrier having a range of frequencies, wherein frequencies outside of the carrier frequency range include spurious regions, the method comprising:

identifying resource blocks of the carrier that have been allocated to transmit the uplink signal;

determining, based on the identified resource blocks, a power spectral density;

determining a metric, the metric being based on a fifth order convolution of the power spectral density function; and

determining a maximum power reduction for the spurious regions based on the determined metric.

12. The method of claim 11, wherein determining a metric comprises:

determining a function based on the fifth order convolution; and

determining the metric based on an integral of the determined function over frequency intervals of the spurious regions.

13. The method of claim 11, wherein determining a maximum power reduction comprises:

referencing a map of a metric to a maximum power reduction; and

based on the referencing step, determining the maximum power reduction that corresponds to the determined metric.

14. The method of claim 11, wherein frequencies inside of the spurious regions include adjacent channel regions, wherein the determined metric is a first metric, wherein the determined function is a first function, the method further comprising,

determining a second function, the second function being based on a third order convolution of a function of the power spectral density;

determining a second metric, the second metric being based on an integral of the second function over frequency intervals of the adjacent channel regions;

determining a maximum power reduction for the adjacent channel regions based on the determined second metric.

15. The method of claim 14, wherein determining the second metric comprises:

referencing a map of a metric to a maximum power reduction;

based on the referencing step, determining the maximum power reduction that is mapped to the determined second metric.

16. The method of claim 14, further comprising determining the maximum of the adjacent channel maximum power reduction and the spurious region maximum power reduction.

17. The method of claim 15, wherein a first portion of the spurious regions is at a lower frequency than the carrier, and a second portion of the spurious regions is at a higher frequency than the carrier.

18. A method of determining a maximum power reduction of a wireless terminal, the method comprising:

determining whether a frequency span of the n-th order convolution of the power spectral density of the uplink signal overlaps with the spurious region;

if it is determined that a frequency span of the n-th order convolution of the power spectral density of the uplink signal overlaps with the spurious region, determining a maximum power reduction using a first map; and

if it is determined that a frequency span of the n-th order convolution of the power spectral density of the uplink signal does not overlap with the spurious region, determining a maximum power reduction using a second map.

19. The method of claim 18, wherein n=5.

20. The method of claim 18, further comprising setting an uplink power based on the determined maximum power reduction.

21. The method of claim 18, further comprising computing a maximum configured power based on the determined maximum power reduction.

22. The method of claim 18, further comprising computing a power headroom based on the determined maximum power reduction.

23. The method of claim 18, wherein the maximum power reduction is determined by a base unit and is transmitted to the wireless terminal by the base unit.

24. The method of claim 18, wherein the maximum power reduction is determined by the wireless terminal.

25. The method of claim 18, wherein determining whether a frequency span of the n-th order convolution of the power spectral density of the uplink signal overlaps with the spurious region comprises:

determining that the metric Δ

=max(abs(f_c−

(3f_min−

2f_max)),abs(f_c−

(3f_max−

2f_min))) is below a frequency threshold, thereby determining that the frequency span power spectral density of the uplink signal does not overlap with the spurious region, wherein f_c is the carrier frequency, f_min is the minimum frequency associated with the allocation and f_max is the maximum frequency associated with the allocation.

26. The method of claim 18, wherein determining whether a frequency span of the n-th order convolution of the power spectral density of the uplink signal overlaps with the spurious region comprises:

determining that the metric Δ

=max(abs(f_c−

(3f_min−

2f_max)),abs(f_c−

(3f_max−

2f_min))) is above a frequency threshold, thereby determining that the frequency span power spectral density of the uplink signal overlaps with the spurious region, wherein f_c is the carrier frequency, f_min is the minimum frequency associated with the allocation and f_max is the maximum frequency associated with the allocation