Transmission power control method and apparatus for mobile communication system

• US 6,546,260 B2
• Filed: 12/05/2000
• Issued: 04/08/2003
• Est. Priority Date: 11/27/1996
• Status: Expired due to Term

• Current Assignee: FIPA Frohwitter Intellectual Property AG
• Original Assignee: Hitachi, Ltd.
• Inventors: Doi, Nobukazu, Yano, Takashi, Esmailzadeh, Riaz
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): Trinh, Sonny
• Application Number:
  US09/729,272
• Publication Number:
  US 20010000168A1
• Time in Patent Office: 854 Days
• Field of Search: 455/69, 455/522, 455/68, 455/13.4, 455/517, 455/572, 455/574, 455/115, 455/126, 455/127, 455/423, 455/63, 370/332, 370/318, 330/298
• US Class Current: 455/522
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/362 Aspects of the step size

Abstract

A method and apparatus for controlling the power of a signal transmitted between a base station and a mobile terminal which constitute a mobile communication system. At least one of the base station and the mobile terminal has functions to compare a predetermined reference value and a necessary transmission power obtained as a result of transmission power control in order to compensate for a signal intensity fluctuation occurring on a link between the base station and the mobile terminal, temporarily stopping the transmission if the necessary transmission power is larger than a predetermined permissible value, and transmit the signal if the necessary transmission power is equal to or smaller than the predetermined permissible value.

Claims

1. A method of controlling transmission power by a mobile terminal which communicates with a base station by radio, the method comprising the steps of:

judging if a target value of transmission power to be transmitted to the base station is larger than a maximum value; and

temporarily stopping transmission to the base station if said target value of transmission power is larger than the maximum value.

2. A method of controlling transmission power according to claim 1, wherein said judging is judging if transmission power of an up link is larger than the maximum value.

3. A mobile terminal for communicating with a base station by radio, comprising:

a comparator for comparing a target value of transmission power to be transmitted to the base station with a maximum value; and

means for temporarily stopping transmission to the base station if said target value of transmission power is larger than the maximum value.

4. A mobile terminal according to claim 3, wherein said comparator compares transmission power of up link with the maximum value.

5. A mobile terminal which communicates with a base station by radio, comprising:

a comparator which compares a target value of transmission power to be transmitted to the base station with a maximum value; and

a control circuit which temporarily stops transmission to the base station if said target value of transmission power is larger than the maximum value.

6. A mobile terminal according to claim 5, wherein said comparator compares transmission power of up link with the maximum value.

7. A method of controlling transmission power by a mobile terminal which communicates with a base station by radio, the method comprising the steps of:

calculating a transmission power necessary to transmit from the mobile terminal to the base station;

judging if the calculated value of transmission power is larger than a maximum value; and

temporarily stopping transmission to said base station if said calculated value of transmission power is larger than the maximum value.

8. A method of controlling transmission power according to claim 7 wherein said calculated value of transmission power is calculated to compensate for fading between the mobile terminal and the base station.

9. A mobile terminal for communicating with a base station by radio, comprising:

means for calculating a value of transmission power necessary to transmit from the mobile terminal to a base station;

a comparator for comparing the calculated value of transmission power with a maximum value; and

means for temporarily stopping transmission to said base station if said calculated value of transmission power is larger than the maximum value.

10. A mobile terminal for communicating with a base station by radio according to claim 9 wherein said calculated value of transmission power is calculated to compensate for fading between the mobile terminal and the base station.

11. A mobile terminal which communicates with a base station by radio and comprising:

a calculator which calculates a value of transmission power necessary to transmit from the mobile terminal to the base station;

a comparator which compares the calculated value of transmission power with a maximum value; and

a control circuit which temporarily stops transmission to said base station if said calculated value of transmission power is larger than the maximum value.

12. A mobile terminal for communicating with a base station by radio according to claim 11 wherein said calculated value of transmission power is calculated to