Transmission power control method

• US 5,852,782 A
• Filed: 12/27/1996
• Issued: 12/22/1998
• Est. Priority Date: 12/28/1995
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Komatsu, Masahiro
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Aoki, Makoto
• Application Number:
  US08/774,201
• Time in Patent Office: 725 Days
• Field of Search: 455/68, 455/69, 455/92, 455/352, 455/353, 455/117, 455/127, 455/522
• US Class Current: 455/522
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A transmission power control method that is able to keep the signal quality approximately constant. A receiving-side station measures the average CIR for the radio communication channel in use. The receiving side station delivers a command for decreasing the transmission power to a transmitting-side station when the measured value is equal to or greater than a reference value. The receiving-side station also delivers a command for increasing the transmission power to the transmitting-side station when the measured value is less than the reference value. When a command for a preceding control period is an increase command, the transmitting power for the next control period is set as a first value obtained by subtracting a predetermined value from a prior value that precedes by the delay time. When the command for a preceding control period is a decrease command, and the sum period is not longer than the delay time, the transmitting power is set as a second value, which is a lower one of the first value and the preceding value. When the command for a preceding control period is a decrease command, and the sum period of the prior successive decrease commands is longer than the delay time, the transmitting power is set as a third value obtained by subtracting the predetermined value from the preceding value. When the detected command is the increase command, the power is set as a value in a similar way.

Claims

1. A transmission power control method for a cellular type mobile communication network, in which a radio communication channel is established between a base station and a mobile station for performing communications;

said method comprising the steps of;

(a) detecting a current command for a current control period transmitted from a station on the receiving side by a station on the transmitting side; and

(b) judging whether or not the content of said detected current command is the same as that of a preceding command for a preceding control period that has been detected by said station on the transmitting side;

when the content of said current command is not the same as that of said preceding command, the transmitting power for a next control period is set as a first value;

and said first value is obtained by either adding a predetermined value to a prior value of the transmission power for a prior control period that is prior to said current control period by a delay time, or subtracting said predetermined value from said prior value of the transmission power according to the content of said detected current command;

and said delay time is defined as a time from detection of said current command by said station on the transmitting side to realization of said detected current command;

and when the content of said current command is the same as that of said preceding command, and at the same time, a sum period of successive control periods having the same command which are prior to said current control period is not longer than said delay time, the transmission power for said next control period is set as a second value;

and said second value is a lower or higher one of said first value and said preceding value of the transmission power according to the content of said detected current command;

and when the content of said current command is the same as that of the preceding command, and at the same time, said sum period is longer than said delay time, the transmission power for said next control period is set as a third value;

and said third value is obtained by either adding said predetermined value to said preceding value of the transmission power, or subtracting said predetermined value from said preceding value of the transmission power according to the content of said detected current command.