Method and system of transmission power control

• US 7,570,967 B2
• Filed: 12/18/2001
• Issued: 08/04/2009
• Est. Priority Date: 12/29/2000
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Ronkainen, Henrik
• Primary Examiner(s): Lee; John J
• Application Number:
  US10/451,425
• Publication Number:
  US 20040087328A1
• Time in Patent Office: 2,786 Days
• Field of Search: 455/522, 455/69, 455/507, 455/67.11, 455/68, 455/70, 455/517, 455/67.1, 455/126, 455/127.1, 455/135, 455/509, 455/115.1, 370/335, 370/342, 370/336, 370/337
• US Class Current: 455/522
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/58 Format of the TPC bits

Abstract

The present invention relates to cellular mobile radio systems, and more especially it relates to Code Division Multiple Access, CDMA, cellular mobile radio systems, particularly to transmission power control in such systems. A method and apparatus for transmission of TPC commands when a user equipment is beyond or close to a certain cell radius is disclosed.

Claims

1. A method of communicating power control commands from a receiver to a transmitter wherein a first power control command is communicated when there is most recent measurement data not previously forming a basis for a power control command available at a specified point in time, and a second or third power control command is communicated when no most recent measurement data not previously forming a basis for a power control command is available at the specified point in time, and wherein measurement data not yet forming a basis of a power control command is stored until new measurement data is collected or the measurement data is used for forming a basis of a power control command.

2. A method of communicating power control commands from a receiver to a transmitter wherein a first power control command is communicated when there is most recent measurement data not previously forming a basis for a power control command available at a specified point in time, and a second or third power control command is communicated when no most recent measurement data not previously forming a basis for a power control command is available at the specified point in time, and wherein the second power control command is communicated when the immediately preceding power control command was a first power control command.

3. The method according to claim 2 characterized in that the first power control command is determined on the basis of measurement data received most recently and prior to the specified point in time;

the measurement data received not previously serving as a basis of determining a power control command.

4. The method according to claim 2 characterized in that the receiver is a radio base station, or is included in or connected to a radio base station.

5. The method according to claim 2 characterized in that the receiver is a mobile station, or is included in or connected to a mobile station.

6. A radio communication system comprising means for carrying out the method of claim 2.

7. A method of communicating power control commands from a receiver to a transmitter wherein a first power control command is communicated when there is most recent measurement data not previously forming a basis for a power control command available at a specified point in time, and a second or third power control command is communicated when no most recent measurement data not previously forming a basis for a power control command is available at the specified point in time, and wherein the third power control command is communicated when the immediately preceding power control command was a second or a third power control command.

8. A method of communicating power control commands from a receiver to a transmitter wherein a first power control command is communicated when there is most recent measurement data not previously forming a basis for a power control command available at a specified point in time, and a second or third power control command is communicated when no most recent measurement data not previously forming a basis for a power control command is available at the specified point in time, and wherein the second power control command is identical to the immediately preceding power control command.

9. A method of communicating power control commands from a receiver to a transmitter wherein a first power control command is communicated when there is most recent measurement data not previously forming a basis for a power control command available at a specified point in time, and a second or third power control command is communicated when no most recent measurement data not previously forming a basis for a power control command is available at the specified point in time, and wherein the third power control command is identical to the immediately preceding power control command inverted.

10. A method of communicating power control commands from a receiver to a transmitter wherein a first power control command is communicated when there is most recent measurement data not previously forming a basis for a power control command available at a specified point in time, and a second or third power control command is communicated when no most recent measurement data not previously forming a basis for a power control command is available at the specified point in time, and wherein the specified point in time is equal to or related to the point in time of assignment of a TPC command.

11. A method of communicating power control commands from a receiver to a transmitter wherein a first power control command is communicated when there is most recent measurement data not previously forming a basis for a power control command available at a specified point in time, and a second or third power control command is communicated when no most recent measurement data not previously forming a basis for a power control command is available at the specified point in time, and wherein the specified point in time corresponds to a largest loop delay equal to the duration of an integer multiple of the duration of one slot interval, the integer multiple being at least one.

12. A receiver element including means for communication of power control commands to a transmitter, the receiver element comprising:

means for determining when there is available most recent measurement data;

means for communication of a first power control command when the most recent measurement data is available and for communication of a second or third power control command when no most recent measurement data is available, the third power control command being identical to an immediately preceding power control command inverted;

means for communication of the second power control command when the immediately preceding power control command was a first power control command.

13. A receiver element including means for communication of power control commands to a transmitter, the receiver element comprising:

means for determining when there is available most recent measurement data;

means for communication of a first power control command when the most recent measurement data is available and for communication of a second or third power control command when no most recent measurement data is available, the third power control command being identical to an immediately preceding power control command inverted;

means for communication of the third power control command when the immediately preceding power control command was a second or a third power control command.

14. The receiver element according to claim 13, characterized by means for determining the first power control command on the basis of the measurement data received most recently.

15. The receiver element according to claim 13 characterized in that the receiver is a radio base station, or is included in or connected to a radio base station.

16. The receiver element according to claim 13 characterized in that the receiver is a mobile station, or is included in or connected to a mobile station.

17. A receiver element including means for communication of power control commands to a transmitter, the receiver element comprising:

means for determining when there is available most recent measurement data;

means for communication of a first power control command when the most recent measurement data is available and for communication of a second or third power control command when no most recent measurement data is available, the third power control command being identical to an immediately preceding power control command inverted;

wherein the second power control command is identical to the immediately preceding power control command.

18. A receiver element including means for communication of power control commands to a transmitter, the receiver element comprising:

means for determining when there is available most recent measurement data;

means for communication of a first power control command when the most recent measurement data is available and for communication of a second or third power control command when no most recent measurement data is available, the third power control command being identical to an immediately preceding power control command inverted;

wherein the third power control command is identical to the immediately preceding power control command inverted.

19. A receiver comprising:

a loop delay detector configured to determine when a loop delay between the receiver and a transmitter is within a transmission slot interval;

a power control command generator configured to generate a power control command for transmission to the transmitter, and wherein the power control command as generated by the power control command generator is either;

(1) dependent upon a measurement made within the transmission slot interval when the loop delay is within the transmission slot interval;

(2) a repetition of a most recently transmitted power control command when the loop delay is not within the transmission slot interval and the most recently transmitted power control command was based on measurement not previously forming a basis for a power control command;

(3) dependent upon measurement data which has been not utilized for a power control command when the loop delay is not within the transmission slot interval;

(4) an inversion of the most recently transmitted power control command when the loop delay is not within the transmission slot interval and the most recent measurement data previously formed a basis for a power control command.

20. The apparatus of claim 19, wherein the receiver comprises a radio base station.

21. The apparatus of claim 19, wherein the receiver comprises a wireless terminal.

22. A receiver element comprising:

means for communication of power control commands to a transmitter;

means for determining when most recent measurement data is available;

means for communication of a first power control command when the most recent measurement data is available and, when no most recent measurement data is available, for making a selection between a second power value or a third power value, the selection depending on how long measurement data has been unavailable;

means for storage of measurement data not yet forming a basis of a power control command.

23. A receiver element comprising:

means for communication of power control commands to a transmitter;

means for determining when most recent measurement data is available;

means for communication of a first power control command when the most recent measurement data is available and, when no most recent measurement data is available, for making a selection between a second power value or a third power value, the selection depending on how long measurement data has been unavailable;

wherein the second power value is a repeat of a previous power value and the third power value is an inversion of the previous power value.