Transmit power control method and apparatus

• US 9,432,949 B2
• Filed: 09/15/2014
• Issued: 08/30/2016
• Est. Priority Date: 02/21/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Soeng Hun, Kim, Sang Bum
• Primary Examiner(s): YEUNG, MANG HANG
• Application Number:
  US14/486,591
• Publication Number:
  US 20150003385A1
• Time in Patent Office: 715 Days
• Field of Search: 370/329, 370/431, 455/69, 455450-509, 455/522
• US Class Current: 1/1
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/286 during data packet transmission, e.g. high speed packet access [HSPA]
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

A method and apparatus for controlling transmit power of a User Equipment (UE) in a mobile communication system is provided. The transmit power control method of the present invention includes determining, when the terminal'"'"'s required transmit power exceeds the terminal'"'"'s maximum transmit power, whether a plurality of Hybrid Automatic Repeat reQuest (HARQ) processes are running and reducing, when the plurality of HARQ processes are running, a transmit power of at least one of the plurality of HARQ processes which has not experienced transmit power reduction previously. The UE transmit power control method and apparatus of the present invention is advantageous to control the transmit power in transmit power reduction mode.

Claims

1. A method of controlling transmit power by a terminal, the method comprising:

if a required transmit power of the terminal exceeds a maximum transmit power of the terminal, reducing a transmit power of at least one hybrid automatic repeat request (HARQ) process; and

if the required transmit power of the terminal does not exceed the maximum transmit power of the terminal and one or more HARQ process has previously experienced transmit power reduction, increasing the reduced transmit power of the one or more HARQ process,

wherein the reducing of the transmit power of the at least one HARQ process comprises selecting the at least one HARQ process to reduce the transmit power based on a number of previous power reduction.

2. The method of claim 1, wherein the increasing of the reduced transmit power of the at least one HARQ process comprises selecting the one or more HARQ process to increase the transmit power based on accumulated power reduction.

3. The method of claim 1, further comprising accumulating an amount of the transmit power reduction of the one or more HARQ process that has previously experienced the transmit power reduction;

and

increasing, if the required transmit power of the terminal does not exceed the maximum transmit power of the terminal, the transmit power of one of at least one or more HARQ process based on the amount of the accumulated power reduction in the corresponding HARQ process.

4. The method of claim 1, wherein each of the at least one HARQ process is an independent HARQ process managing HARQ packets.

5. A terminal for controlling transmit power, the terminal comprising:

a transmitter configured to transmit a signal; and

a controller configured to;

control the transmitter, if a required transmit power of the terminal exceeds a maximum transmit power of the terminal, to reduce a transmit power of at least one hybrid automatic repeat request (HARQ) process, and

control the transmitter, if the required transmit power of the terminal does not exceed the maximum transmit power of the terminal and one or more HARQ process has previously experienced transmit power reduction, to increase a reduced transmit power of the one or more HARQ process,

wherein the controller is configured to select the at least one HARQ process to reduce the transmit power based on a number of previous power reduction.

6. The terminal of claim 5, wherein the controller is further configured to select the one or more HARQ process to increase the transmit power based on accumulated power reduction.

7. The terminal of claim 5, wherein the controller is further configured to accumulate an amount of the transmit power reduction of the one or more HARQ process that has previously experienced the transmit power reduction, and increase, if the required transmit power of the terminal does not exceed the maximum transmit power of the terminal, the transmit power of one of the one or more HARQ process based on the amount of the accumulated power reduction in the corresponding HARQ process.

8. The terminal of claim 5, wherein each of the at least one HARQ process is an independent HARQ process managing HARQ packets.