METHOD FOR REDUCING TRANSMISSION POWER FOR SOUNDING REFERENCE SIGNAL AND TERMINAL THEREFOR

• US 20150055580A1
• Filed: 06/18/2012
• Published: 02/26/2015
• Est. Priority Date: 04/16/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lim, Suhwan, Jung, Manyoung, Yang, Yoonoh, Lee, Sangwook
• Granted Patent: US 9,661,591 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2636 with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/244 Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

One embodiment of the present invention provides a method for transmitting a signal in a terminal. The method for transmitting a signal in a terminal comprises the steps of: setting a maximum power reduction (MPR) value for signal transmission power, wherein the maximum power reduction value is independently set for a sounding reference signal (SRS), and the maximum power reduction value which is set for the SRS is different from a maximum power reduction value which is set for another signal; and transmitting the SRS with transmission power which is set according to the set maximum power reduction value.

Claims

1. A method for transmitting a signal by a user equipment, the method comprising:

setting a maximum power reduction (MPR) value for a signal transmission power, wherein the MPR value is independently set for sounding reference signal (SRS) and the MPR value set for the SRS is different form an MPR value set for another signal; and

transmitting the SRS with a transmission power set according to the MPR value set for the SRS.

2. The method according to claim 1, wherein the MPR value set for the SRS is indicated through network signaling from a serving cell or is known to the user equipment.

3. The method according to claim 1, wherein cell breathing is performed through independent setting of the MPR value for the SRS.

4. The method according to claim 1, wherein the MPR value is independently set for the SRS when a first cell supports carrier aggregation together with a second cell or when the first cell performs a coordinated multi-point (COMP) operation together with the second cell.

5. The method according to claim 4, wherein independent setting of the MPR value for the SRS is performed when the user equipment moves out of coverage of the first cell into coverage of the second cell or out of coverage of the second cell into coverage of the first cell.

6. The method according to claim 5, wherein the MPR value independently set for the SRS is not used when the user equipment moves to an overlapping region of the first cell and the second cell again.

7. The method according to claim 4, wherein the first cell is a primary cell and the second cell is a secondary cell or the first cell is a macrocell or the second cell is a picocell.

8. The method according to claim 1, further comprising:

receiving control signal through an uplink control channel,

wherein the control signal is received in a data region other than an edge of a channel band.

9. The method according to claim 1, further comprising receiving control signal by physical uplink control channel (PUCCH) over-provisioning.

10. A user equipment, comprising:

a controller for setting a maximum power reduction (MPR) value for a signal transmission power, wherein the MPR value is independently set for a sounding reference signal (SRS) and the MPR value set for the SRS is different form an MPR value set for another signal; and

a transceiver for transmitting the SRS with a transmission power set according to the MPR value set for the SRS.

11. The user equipment according to claim 10, wherein the MPR value set for the SRS is indicated through network signaling from a serving cell or is known to the user equipment.

12. The user equipment according to claim 10, wherein cell breathing is performed through independent setting of the MPR value for the SRS.

13. A method for controlling a transmission power of a user equipment by a serving cell, the method comprising:

independently setting a maximum power reduction (MPR) value for a sounding reference signal (SRS) when the serving cell supports carrier aggregation (CA) together with another cell or performs a coordinated multi-point (COMP) operation together with another cell;

transmitting the set MPR value to the user equipment through network signaling; and

receiving the SRS from the user equipment.

14. The method according to claim 13, wherein cell breathing is performed through independent setting of the MPR value.

15. A serving base station, comprising:

a controller for independently setting a maximum power reduction (MPR) value for a sounding reference signal (SRS) when the serving base station supports carrier aggregation (CA) together with another cell or performs a coordinated multi-point (COMP) operation together with another cell;

a transmitter for transmitting the set MPR value to a user equipment through network signaling; and

a receiver for receiving the SRS from the user equipment.