METHOD FOR CONTROLLING TRANSMISSION POWER IN A WIRELESS ACCESS SYSTEM AND APPARATUS FOR SAME

• US 20140071933A1
• Filed: 06/20/2012
• Published: 03/13/2014
• Est. Priority Date: 06/20/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Sangwook, Jung, Manyoung, Yang, Yoonoh, Lim, Suhwan, Lee, Byongyol
• Granted Patent: US 9,706,498 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

The present invention relates to a method for controlling transmission power in a wireless access system that supports an operation in an unlicensed band, and to an apparatus for same. More particularly, the method for controlling the transmission power of a terminal in a wireless access system that supports a TV white space (TV WS) band comprises the steps of: allocating, to a terminal, an available frequency band which is not used by a licensed device from among the TV WS band; calculating, if a receiving band of another device exists in a band adjacent to the available frequency band, the maximum transmission power value of the terminal based on a level of interference which will not affect the reception of another device; and transmitting, to the terminal, transmission power control information for correcting the transmission power of the terminal on the basis of the maximum transmission power value.

Claims

1. A method for controlling a transmission power of a user equipment in a wireless access system supportive of a TV white space (TV WS) band, the method comprising:

assigning to the user equipment an available frequency band unused by a licensed device in the TV WS band;

calculating a maximum transmission power value of the user equipment based on a level of interference which does not affect receiving by another device, when a receiving band of the another device exists on an adjacent band of the available frequency band; and

transmitting, to the user equipment, transmission power control information for correcting a transmission power of the user equipment based on the maximum transmission power value.

2. The method of claim 1, further comprising receiving, from the user equipment or a network, information indicating whether the receiving band of the another device exists on the adjacent band.

3. The method of claim 1, further comprising determining whether the receiving band of the another device exists on the adjacent band, through usage information of the TV WS band shared with another base station.

4. The method of claim 1, wherein the transmission power control information comprises A-MPR (Additional Maximum Power Reduction).

5. A method for controlling a transmission power of a user equipment in a wireless access system supportive of a TV white space (TV WS) band, the method comprising:

calculating a maximum transmission power value of the user equipment based on a level of interference which does not affect receiving by another device, when a receiving band of the another device exists on an adjacent band of a frequency band assigned by a base station; and

transmitting, to the user equipment, transmission power correction information indicating the calculated maximum transmission power value,

wherein the assigned frequency band corresponds to an available frequency band unused by a licensed device in the TV WS band.

6. The method of claim 5, further comprising determining whether the receiving band of the another device exists on the adjacent band by performing a frequency scan on the adjacent band.

7. The method of claim 5, further comprising receiving, from the base station, information indicating whether the receiving band of the another device exists on the adjacent band.

8. The method of claim 5, wherein the maximum transmission power value is calculated in consideration of performance of a RF (radio frequency) unit of the user equipment.

9. A base station in a wireless access system supportive of a TV white space (TV WS) band, the base station comprising:

a RF (radio frequency) unit configured to transceive a wireless signal; and

a processor assigning, to a user equipment, an available frequency band unused by a licensed device in the TV WS band, calculating a maximum transmission power value of the user equipment based on a level of interference which does not affect receiving by another device when a receiving band of the another device exists on an adjacent band of the available frequency band, and transmitting, to the user equipment, transmission power control information for correcting a transmission power of the user equipment based on the maximum transmission power value.

10. A user equipment in a wireless access system supportive of a TV white space (TV WS) band, the user equipment comprising:

a RF (radio frequency) unit configured to transceive a wireless signal; and

a processor calculating a maximum transmission power value of the user equipment based on a level of interference which does not affect receiving by another device when a receiving band of the another device exists on an adjacent band of a frequency band assigned by a base station, and transmitting, to the user equipment, transmission power correction information indicating the calculated maximum transmission power value,

wherein the assigned frequency band corresponds to an available frequency band unused by a licensed device in the TV WS band.