Method and system for managing transmit power on a wireless communication network

• US 9,538,478 B2
• Filed: 12/08/2015
• Issued: 01/03/2017
• Est. Priority Date: 11/05/2012
• Status: Expired due to Fees

• 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.
• Primary Examiner(s): Liu, Siming
• Application Number:
  US14/962,036
• Publication Number:
  US 20160088569A1
• Time in Patent Office: 392 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, by the wireless terminal, whether a frequency span of an n-th order convolution of a power spectral density function of an uplink signal overlaps with a spurious region, wherein n is one of at least 3 and 5;

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

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

reducing, by the wireless terminal, transmit power of the wireless terminal based on the determined maximum power reduction.

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

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

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

5. 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.

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

7. The method of claim 1, wherein determining whether the frequency span of the n-th order convolution of the power spectral density function of the uplink signal overlaps with the spurious region comprises:

determining that a 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 function 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 an allocation to the first map and f_max is the maximum frequency associated with the allocation to the first map.

8. The method of claim 1, wherein determining whether the frequency span of the n-th order convolution of the power spectral density function of the uplink signal overlaps with the spurious region comprises:

determining that a 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 function of the uplink signal overlaps with the spurious region, wherein f_c is the carrier frequency, f_min is the minimum frequency associated with an allocation to the second map and f_max is the maximum frequency associated with the allocation to the second map.