BASE STATION AND METHOD

• US 20130107751A1
• Filed: 06/29/2011
• Published: 05/02/2013
• Est. Priority Date: 07/07/2010
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Kiyoshima, Kohei, Okubo, Naoto, Ishii, Hiroyuki
• Application Number:
  US13/807,321
• Publication Number:
  US 20130107751A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/125 cascaded outer loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/242 taking into account path loss

Abstract

A base station includes a first target receiving power calculation unit that calculates first target receiving power for controlling transmission power based on a path loss and a first parameter used by the user equipment transmitting user data in a predetermined sub-frame through an uplink shared channel to control the transmission power, a difference calculation unit that calculates, based on the path loss, a difference between the first target receiving power and second target receiving power used by the user equipment transmitting the user data through the uplink shared channel at every constant interval to control the transmission power, a second parameter calculation unit that calculates a second parameter by subtracting the difference from the first parameter, and a notification unit that reports the second parameter. The first target receiving power calculation unit calculates the first target receiving power to be greater as the path loss becomes smaller.

Claims

1. A base station that performs wireless communication with user equipment, the base station comprising:

a path loss calculation unit that calculates a path loss at the user equipment;

a first target receiving power calculation unit that calculates first target receiving power based on the path loss and a first parameter, wherein the first parameter is used by the user equipment that transmits user data in a predetermined sub-frame through an uplink shared channel when the user equipment controls transmission power, and the first target receiving power is for the user equipment that transmits the user data in the predetermined sub-frame through the uplink shared channel when the user equipment controls the transmission power;

a difference calculation unit that calculates a difference between the first target receiving power that has been calculated by the first target receiving power calculation unit based on the path loss and a second target receiving power that is to be used by the user equipment when the user equipment controls the transmission power, the user equipment transmitting the user data through the uplink shared channel at every constant interval;

a second parameter calculation unit that calculates a second parameter by subtracting the difference calculated by the difference calculation unit from the first parameter; and

a notification unit that reports the second parameter that has been calculated by the second parameter calculation unit,

wherein the first target receiving power calculation unit calculates the first target receiving power such that the first target receiving power becomes greater as the path loss becomes smaller.

2. The base station according to claim 1, further comprising:

a path loss determination unit that determines whether an amount of change between the path loss that has been calculated by the path loss calculation unit and the path loss at a time of updating the second parameter immediately prior to the calculation is greater than or equal to a predetermined threshold value,

wherein the first target receiving power calculation unit calculates the first target receiving power when the path loss determination unit has determined that the amount of change is greater than or equal to the threshold value,

wherein the difference calculation unit calculates the difference based on the first target receiving power that has been calculated by the first target receiving power calculation unit, and

the second parameter calculation unit calculates the second parameter by subtracting the difference that has been calculated by the difference calculation unit from the first parameter.

3. The base station according to claim 1,

wherein the notification unit reports the second parameter that has been calculated by the second parameter calculation unit through a dedicated channel.

5. The base station according to claim 2,

wherein the notification unit reports the second parameter that has been calculated by the second parameter calculation unit through a dedicated channel.

4. A method of a base station that performs wireless communication with user equipment, the method comprising:

a path loss calculation step of calculating a path loss at the user equipment;

a first target receiving power calculation step of calculating a first target receiving power based on the path loss and a first parameter, wherein the first parameter is to be used by the user equipment that transmits user data in a predetermined sub-frame through an uplink shared channel when the user equipment controls transmission power, and the first target receiving power is for the user equipment that transmits the user data in the predetermined sub-frame through the uplink shared channel when the user equipment controls the transmission power;

a difference calculation step of calculating a difference between the first target receiving power and a second target receiving power based on the path loss, wherein the second target receiving power is for the user equipment to control the transmission power, the user equipment transmitting the user data through the uplink shared channel at every constant interval;

a second parameter calculation step of calculating a second parameter by subtracting the difference that has been calculated by the difference calculation step from the first parameter; and

a notification step of reporting the second parameter that has been calculated by the second parameter calculation step,

wherein the first target receiving power calculation step calculates the first target receiving power such that the first target receiving power becomes greater as the path loss becomes smaller.