Communication device and transmission power control method

Patent metadata

Field	Value
Publication number	US-9307496-B2
Application number	US-201313895285-A
Country	US
Kind code	B2
Filing date	May 15, 2013
Priority date	Jul 25, 2012
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

In a mobile station, an RF receiving unit receives a signal transmitted from another communication device. A reception quality detecting unit detects reception quality on the basis of the received signal. A receiving processing unit extracts a TPC value from the received signal. A transmission power control unit corrects the extracted TPC value on the basis of the detected reception quality. If a conversion condition is satisfied, the transmission power control unit corrects the TPC value. For example, the conversion condition includes a condition in which a first variation direction of the detected reception quality is an inverse of a second variation direction of transmission power represented by the TPC value.

First claim

What is claimed is:

1. A mobile station comprising:
a receiving unit that receives a signal transmitted from a base station;
a detecting unit that detects reception quality on the basis of the received signal, the reception quality varying by frames of the received signal in a first variation direction;
an extracting unit that extracts, from the received signal, a control value that controls transmission power of the mobile station to a second variation direction either increasing or decreasing the transmission power; and
a correction unit that corrects the extracted control value to control the transmission power to an opposite direction of the second variation direction, on the basis of a result of comparing the second variation direction with the first variation direction.

2. The mobile station according to claim 1 , wherein
the correction unit corrects the control value when a correction condition is satisfied, and
the correction condition includes a first condition in which the first variation direction of the detected reception quality is an inverse of the second variation direction of the transmission power represented by the extracted control value.

3. A communication device comprising:
a receiving unit that receives a signal transmitted from another communication device;
a detecting unit that detects reception quality on the basis of the received signal;
an extracting unit that extracts, from the received signal, a control value that controls transmission power of the communication device in which the extracting unit is located; and
a correction unit that corrects the extracted control value when a correction condition is satisfied, the correction condition including a first condition in which a first variation direction of the detected reception quality is an inverse of a second variation direction of transmission power represented by the extracted control value and a second condition in which a transmission power value, before control is performed by using the extracted control value, is at an upper limit.

4. A transmission power control method in a mobile station, the transmission power control method comprising:
receiving, by a receiver, a signal transmitted from a base station;
detecting, by a processor, reception quality on the basis of the received signal, the reception quality varying by frames of the received signal in a first variation direction;
extracting, by the processor, a control value that controls transmission power of the mobile station to a second variation direction either increasing or decreasing the transmission power, from the received signal; and
correcting, by the processor, the extracted control value to control the transmission power to an opposite direction of the second variation direction, on the basis of a result of comparing the second variation direction with the first variation direction.

Assignees

• Fujitsu Ltd

Inventors

• Saitoh Yoshimitsu

Classifications

• H04W52/545

  modifying TPC bits in special situations · CPC title

• H04W52/367

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title

• H04W52/247 Primary

  where the output power of a terminal is based on a path parameter sent by another terminal · CPC title

• H04W52/12 Primary

  Outer and inner loops · CPC title

• H04W52/241

  taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo · CPC title