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

• US 20160088569A1
• Filed: 12/08/2015
• Published: 03/24/2016
• Est. Priority Date: 11/05/2012
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Inventors: Frank, Colin D., Brown, Tyler A., Krishnamurthy, Sandeep H.
• Granted Patent: US 9,538,478 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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.

2. The method of claim 1, wherein n=5.

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

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

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

6. The method of claim 1, wherein the maximum power reduction is determined by a base unit and is transmitted to the wireless terminal by the base unit.

7. The method of claim 1, wherein the maximum power reduction is determined by the wireless terminal.

8. The method of claim 1, 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.

9. The method of claim 1, 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.