FEEDBACK GENERATION METHOD AND SYSTEM FOR UPLINK TRANSMIT POWER CONTROL

• US 20110141931A1
• Filed: 09/01/2010
• Published: 06/16/2011
• Est. Priority Date: 12/15/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: BAE, Jung Sook, KIM, Yeong Jin, KIM, Daeho, HWANG, Hyungu
• Granted Patent: US 8,593,980 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/282 taking into account the speed of the mobile
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure

Abstract

A feedback generation method for uplink Transmit Power Control (TPC) in a mobile communication system is provided. A feedback generation system for uplink TPC includes an uplink information receiver to receive uplink information from a terminal, to measure a Signal-to-Interference Noise Ratio (SINR) value with respect to the received uplink information, and to measure a movement speed of the terminal, a transmission power adjustment value setting unit to set a transmission power adjustment value based on the movement speed of the terminal; an adjusted SINR calculator to calculate an adjusted SINR value, based on an expected SINR value and the measured SINR value; and a feedback information regenerator to regenerate feedback information based on the transmission power adjustment value and the adjusted SINR value, and to transmit the regenerated feedback information to the terminal.

Claims

1. A feedback generation system for an uplink Transmit Power Control (TPC), the feedback generation system comprising:

an uplink information receiver to receive uplink information from a terminal, to measure a Signal-to-Interference Noise Ratio (SINR) value with respect to the received uplink information, and to measure a movement speed of the terminal;

a transmission power adjustment value setting unit to set a transmission power adjustment value based on the movement speed of the terminal;

an adjusted SINR calculator to calculate an adjusted SINR value, based on an expected SINR value and the measured SINR value; and

a feedback information regenerator to regenerate feedback information based on the transmission power adjustment value and the adjusted SINR value, and to transmit the regenerated feedback information to the terminal.

2. The feedback generation system of claim 1, wherein the transmission power adjustment value setting unit sets the transmission power adjustment value in small units when the terminal is moving at a high speed, and

the transmission power adjustment value setting unit sets the transmission power adjustment value in large units when the terminal is moving at a low speed.

3. The feedback generation system of claim 1, wherein the adjusted SINR calculator calculates the adjusted SINR value based on a difference between the expected SINR value and the measured SINR value.

4. The feedback generation system of claim 1, wherein the feedback information regenerator determines a unit coefficient of a TPC to be adjusted, based on the adjusted SINR value, and regenerates the feedback information using the transmission power adjustment value and the adjusted SINR value based on the determined unit coefficient.

5. The feedback generation system of claim 4, wherein the feedback information regenerator multiplies, by −

1, a value obtained by multiplying the transmission power adjustment value by the unit coefficient, and regenerates the feedback information, when the unit coefficient is greater than 0.

6. The feedback generation system of claim 4, wherein the feedback information regenerator multiplies the transmission power adjustment value by the unit coefficient, and regenerates the feedback information, when the unit coefficient is less than 0.

7. The feedback generation system of claim 4, wherein the feedback information regenerator does not transmit the regenerated feedback information to the terminal, when the regenerated feedback information is equal to 0.

8. The feedback generation system of claim 1, wherein the terminal receives the regenerated feedback information, determines a new transmission power based on the regenerated feedback information, and transmits the uplink information based on the new transmission power.

9. A feedback generation method for an uplink TPC, the feedback generation method comprising:

receiving uplink information from a terminal;

measuring an SINR value with respect to the received uplink information;

measuring a movement speed of the terminal;

setting a transmission power adjustment value based on the movement speed of the terminal;

calculating an adjusted SINR value based on an expected SINR value and the measured SINR value;

regenerating feedback information based on the transmission power adjustment value and the adjusted SINR value; and

transmitting the regenerated feedback information to the terminal.

10. The feedback generation method of claim 9, wherein the setting of the transmission power adjustment value comprises:

determining whether the terminal is moving at a high speed or a low speed;

setting the transmission power adjustment value in small units when the terminal is determined to be moving at the high speed, and

setting the transmission power adjustment value in large units when the terminal is determined to be moving at a low speed.

11. The feedback generation method of claim 9, wherein the calculating of the adjusted SINR value comprises calculating the adjusted SINR value based on a difference between the expected SINR value and the measured SINR value.

12. The feedback generation method of claim 9, wherein the regenerating of the feedback information comprises:

determining a unit coefficient of a TPC to be adjusted, based on the adjusted SINR value; and

regenerating the feedback information using the transmission power adjustment value and the adjusted SINR value based on the determined unit coefficient.

13. The feedback generation method of claim 12, wherein the regenerating of the feedback information comprises:

determining whether the unit coefficient is greater than 0 or less than 0;

multiplying, by −

1, a value obtained by multiplying the transmission power adjustment value by the unit coefficient, and regenerating the feedback information, when the unit coefficient is determined to be greater than 0; and

multiplying the transmission power adjustment value by the unit coefficient, and regenerating the feedback information, when the unit coefficient is determined to be less than 0.

14. The feedback generation method of claim 12, wherein the regenerating of the feedback information comprises:

determining whether the regenerated feedback information is equal to 0 or different from 0;

transmitting the regenerated feedback information to the terminal when the regenerated feedback information is determined to be different from 0; and

abstaining from transmitting the regenerated feedback information to the terminal when the regenerated feedback information is determined to be equal to 0.