Communication method and communication apparatus

• US 6,055,415 A
• Filed: 08/20/1997
• Issued: 04/25/2000
• Est. Priority Date: 08/23/1996
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Suzuki, Mitsuhiro
• Primary Examiner(s): Hunter, Daniel S.
• Assistant Examiner(s): Wyche, Myron K.
• Application Number:
  US08/914,790
• Time in Patent Office: 979 Days
• Field of Search: 455/69, 455/522, 455/88, 455/517, 455/68, 455/70
• US Class Current: 455/69
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters

Abstract

A communication method between a first station and a second station with a full-duplex for transmission power control according to the present invention, includes a receiving step at the second station of receiving an information transmitted from the first station, a first processing step at the second station of processing a first procedure after the receiving step, a second processing step at the second station of processing a second procedure for comparing an output value in the first processing step with a variable reference value set in response to a reception condition, a transmission step at the second station of transmitting a power control information generated in the second processing step to the first station, and a power control step at the first station of controlling a transmission power based on the power control information.

Claims

1. A communication method for communicating between a first station and a second station with a full-duplex for transmission power control, the method comprising the steps of:

receiving at said second station information transmitted from said first station;

first processing at said second station a first procedure after said receiving step for estimating a quality of a communication path based on a status of a received signal;

second processing at said second station a second procedure for comparing an output value from said first processing step with a variable reference value set in response to a reception condition, said variable reference value being a difference between an estimated error value of a decoded received signal and a predetermined fixed reference value, wherein said difference is amplified with a predetermined gain;

transmitting from said second station power control information generated in said second processing step to said first station; and

controlling a transmission power of said first station based on said power control information received from said second station.

2. The communication method according to claim 1, wherein said variable reference value set in response to said reception condition in said second processing step is an accumulated value of a difference between said estimated error value of a decoded received signal and said predetermined fixed reference value.

3. A full-duplex communication apparatus for transmission power control, comprising:

receiving means for receiving information;

first processing means for processing a first procedure on an output signal from said receiving means for estimating a quality of a communication path based on a status of a received signal;

second processing means for processing a second procedure for comparing an output value from said first processing means with a variable reference value set in response to a reception condition, said variable reference value being a difference between an estimated error value of a decoded received signal and a predetermined fixed reference value, wherein said difference is amplified with a predetermined gain; and

transmission means for transmitting an output signal from said second processing means as power control information.

4. The communication apparatus according to claim 3, wherein said variable reference value set in response to said reception condition in said second processing step is an accumulated value of a difference between said estimated error value of a decoded received signal and said predetermined fixed reference value.

5. The communication apparatus according to claim 6, wherein said procedure for estimating said quality of said communication path by said first processing means is a procedure for calculating a ratio of an estimated noise power to an estimated received power.

6. The communication apparatus according to claim 7, wherein said estimated error value of said decoded received signal in said second processing means is a procedure for comparing a previously decoded signal with a re-encoded signal after decoding.

7. The communication apparatus according to claim 3, wherein said communication apparatus is a portable device, said receiving means receives said information transmitted from a base station, and said transmission means transmits said output signal to said base station.

8. The communication apparatus according to claim 3 wherein said communication apparatus is a base station, said receiving means receives said information transmitted from a plurality of portable devices, and said transmission means transmits said output signal to said plurality of portable devices.