Method of controlling transmit power of uplink channel

• US 20090197630A1
• Filed: 01/28/2009
• Published: 08/06/2009
• Est. Priority Date: 02/04/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHEON, Byeong Geol, AHN, Seung Jin, KIM, Mu Ryong, LEE, Byong Yol
• Granted Patent: US 8,351,974 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 1/0032 Without explicit signalling
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04W 52/04 TPC

Abstract

A method of controlling a transmit power of an uplink channel is provided. Downlink control information of which Cyclic Redundancy Check (CRC) parity bits are masked with a TPC identifier is received on a downlink control channel. The transmit power of the uplink channel is adjusted based on a TPC command in the downlink control information.

Claims

1. A method of controlling a transmit power of an uplink channel in a wireless communication system, the method comprising:

receiving downlink control information on a downlink control channel, wherein the downlink control information comprises at least one transmit power control (TPC) command and Cyclic Redundancy Check (CRC) parity bits of the downlink control information are masked with a TPC identifier; and

adjusting the transmit power of the uplink channel based on the at least one TPC command.

2. The method of claim 1, wherein the downlink control channel is a Physical Downlink Control Channel (PDCCH).

3. The method of claim 1, wherein the uplink channel is a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared Channel (PUSCH).

4. The method of claim 3, wherein the PUCCH and the PUSCH use different TPC identifiers.

5. The method of claim 1, wherein the TPC identifier is received from a base station.

6. The method of claim 1, wherein the size of the TPC identifier is 16 bits.

7. The method of claim 1, wherein the downlink control information comprises a plurality of TPC commands.

8. The method of claim 7, further comprising:

selecting the TPC command from among the plurality of TPC commands.

9. The method of claim 8, wherein the TPC command is indicated by a TPC index.

10. The method of claim 9, wherein the TPC index is received from a base station.

11. An apparatus for wireless communication, the apparatus comprising:

a Radio Frequency (RF) unit for transmitting and receiving radio signals; and

a processor coupled with the RF unit and configured to;

receive downlink control information on a downlink control channel, wherein the downlink control information comprises at least one transmit power control (TPC) command and Cyclic Redundancy Check (CRC) parity bits of the downlink control information are masked with a TPC identifier; and

adjust a transmit power of an uplink channel based on the at least one TPC command.

12. The apparatus of claim 11, wherein the downlink control information comprises a plurality of TPC commands and the processor is configured to select the TPC command from among the plurality of TPC commands based on an index.

13. A method of transmitting transmit power control (TPC) commands for controlling a transmit power of an uplink channel in a wireless communication system, the method comprising:

preparing downlink control information which comprises a plurality of TPC commands;

attaching Cyclic Redundancy Check (CRC) parity bits to the downlink control information;

masking the CRC parity bits with a TPC identifier; and

transmitting the CRC-masked downlink control information.

14. The method of claim 13, wherein the TPC identifier is used to identify user equipments to receive the plurality of TPC commands.

15. The method of claim 13, wherein the TPC identifier is used to identify an uplink channel whose transmit power is adjusted.