BASE STATION AND METHOD OF CONTROLLING TRANSMISSION POWER

• US 20150156735A1
• Filed: 06/28/2013
• Published: 06/04/2015
• Est. Priority Date: 08/30/2012
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Goto, Yoshikazu
• Granted Patent: US 9,320,000 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/248 where transmission power control commands are generated based on a path parameter
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure

Abstract

A base station in accordance with one embodiment of the present invention includes a cumulative value storage unit configured to store a cumulative value of transmission power control commands transmitted to a mobile station; a transmission power control command determination unit configured to determine a transmission power control command based on the cumulative value stored in the cumulative value storage unit, when uplink transmission power is initialized; and a control channel transmission unit configured to transmit the transmission power control command determined by the transmission power control command determination unit to the mobile station on a control channel.

Claims

1. A base station, comprising:

a cumulative value storage unit configured to store a cumulative value of transmission power control commands transmitted to a mobile station;

a transmission power control command determination unit configured to determine a transmission power control command based on the cumulative value stored in the cumulative value storage unit, when uplink transmission power is initialized; and

a control channel transmission unit configured to transmit the transmission power control command determined by the transmission power control command determination unit to the mobile station on a control channel.

2. The base station as claimed in claim 1, further comprising:

an interval calculation unit configured to calculate an interval during which the transmission power control command is transmitted based on the cumulative value stored in the cumulative value storage unit, when the uplink transmission power is initialized.

3. The base station as claimed in claim 2,

wherein the transmission power control command determination unit calculates, as a value of the transmission power control command, a value which increments transmission power at maximum when the cumulative value stored in the cumulative value storage unit is positive, and calculates, as the value of the transmission power control command, a value which decrements transmission power at maximum when the cumulative value stored in the cumulative value storage unit is negative, and

the interval calculation unit calculates the interval during which the transmission power control command is transmitted, by dividing the cumulative value stored in the cumulative value storage unit by the increment or decrement value of transmission power calculated by the transmission power control command determination unit.

4. The base station as claimed in claim 2,

wherein the interval calculation unit calculates the interval during which the transmission power control command is transmitted based on an interval predetermined according to the cumulative value stored in the cumulative value storage unit.

5. The base station as claimed in claim 1, further comprising:

a post-initialization cumulative value storage unit configured to store a cumulative value of transmission power control commands determined by the transmission power control command determination unit,

wherein the transmission power control command determination unit determines the transmission power control command based on the cumulative value of transmission power control commands stored in the cumulative value storage unit and the cumulative value of transmission power control commands stored in the post-initialization cumulative value storage unit.

6. The base station as claimed in claim 1, further comprising:

a non-communication interval monitor unit configured to monitor a non-communication interval during which downlink data or uplink data are not transmitted,

wherein the control channel transmission unit transmits control information for causing the mobile station to transmit data or control information, when the non-communication interval monitored by the non-communication interval monitor unit is equal to or longer than a predetermined threshold.

7. A base station, comprising:

a non-communication interval monitor unit configured to monitor a non-communication interval during which downlink data or uplink data are not transmitted;

a control channel transmission unit configured to transmit control information for causing a mobile station to transmit data or control information, when the non-communication interval monitored by the non-communication interval monitor unit is equal to or longer than a predetermined threshold; and

a transmission power control command determination unit configured to determine a transmission power control command based on received quality of data or control information received from the mobile station.

8. A method of controlling uplink transmission power in a base station, comprising the steps of:

storing a cumulative value of transmission power control commands transmitted to a mobile station;

determining a transmission power control command based on the stored cumulative value, when uplink transmission power is initialized; and

transmitting the determined transmission power control command to the mobile station on a control channel.

9. A method of controlling uplink transmission power in a base station, comprising the steps of:

monitoring a non-communication interval during which downlink data or uplink data are not transmitted;

transmitting control information for causing a mobile station to transmit data or control information, when the monitored non-communication interval is equal to or longer than a predetermined threshold; and

determining a transmission power control command based on received quality of data or control information received from the mobile station.