Radio communication system

• US 5,212,823 A
• Filed: 02/12/1990
• Issued: 05/18/1993
• Est. Priority Date: 02/15/1989
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Fujii, Yuichi, Nakanishi, Tetsuaki
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): Belzer, Christine K.
• Application Number:
  US07/478,379
• Time in Patent Office: 1,191 Days
• Field of Search: 455/127, 455/343, 455/54, 455/67, 455/226, 340/825.48
• US Class Current: 455/522
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

In a radio communication system, a base station transmits a signal including a component which designates a power level. A mobile station receives the signal from the base station. In the mobile station, an output power of the mobile station is set to the designated power level, and a field level of the received signal transmitted from the base station is detected. A determination is made as to whether or not the detected field level of the received signal is equal to or higher than a predetermined field level. The output power of the mobile station is decreased from the designated power level by a predetermined value when the detected field level of the received signal is equal to or higher than the predetermined field level.

Claims

1. A radio communication system comprising:

a base station transmitting a signal including a component which designates a power level; and

a mobile station receiving the signal from the base station;

wherein the mobile station comprises means for setting an output power of the mobile station to the designated power level, means for detecting a received field level of the signal transmitted from the base station, means for determining whether or not the detected field level of the received signal is equal to or higher than a predetermined field level, and means for decreasing the output power of the mobile station from the designated power level by a predetermined value when the detected field level of the received signal is equal to or higher than the predetermined field level, and

wherein the base station transmits a speech supervisory signal to the mobile station on a voice channel, the speech supervisory signal includes a tone signal whose frequency resides outside an audio frequency band, and the mobile station transponds the speech supervisory signal even when the output power of the mobile station is decreased by a predetermined value from the designated power level.

2. A radio communication system comprising:

a base station transmitting a signal including a component which designates a power level; and

a mobile station receiving the signal from the base station;

wherein the mobile station comprises means for setting an output power of the mobile station to the designated power level, means for detecting a received field level of the signal transmitted from the base station, means for determining whether or not the detected field level of the received signal is equal to or higher than a predetermined field level, and means for decreasing the output power of the mobile station from the designated power level by a predetermined value when the detected field level of the received signal is equal to or higher than the predetermined field level, and

wherein the mobile station decreases its output power from the designated power level in accordance with the detected field level only in cases where the designated power level agrees with a maximum output power of the mobile station.

3. A mobile radio communication apparatus for communication with a base station, comprising:

means for transmitting a first signal toward the base station;

means for receiving a second signal from the base station, the second signal including a component which designates a desired power level of the first signal transmitted toward the base station;

means for setting an output power of the first signal to the designated desired power level;

means for detecting a field level of the second signal received from the base station;

means for decreasing the output power of the first signal from the designated desired power level in accordance with the detected field level of the second signal; and

means for detecting that the designated desired power level of the first signal differs from a maximum output power of the first signal; and

means for suspending the decreasing of the output power of the first signal when the designated desired power level of the first signal differs from the maximum output power of the first signal.