TERMINAL, BASE STATION, METHOD, AND INTEGRATED CIRCUIT

• US 20140295909A1
• Filed: 11/07/2012
• Published: 10/02/2014
• Est. Priority Date: 11/07/2011
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ouchi, Wataru, Imamura, Kimihiko, Nakashima, Daiichiro
• Granted Patent: US 9,832,732 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04B 7/005 Control of transmission; Equalising
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/216 Code division or spread-spectrum multiple access [CDMA, SSMA]
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

In a communication system in which a base station and a terminal communicates, the base station and the terminal communicates efficiently. There is provided the terminal which communicates with the base station, the terminal including: a reception unit 605 which detects a transmission power control (TPC) command in a downlink control information (DCI) format and obtains a power correction value from the TPC command; and a transmission power control unit 6015 which sets transmission power of an uplink signal based on a power correction value obtained from a first TPC command when the terminal is in a first state and sets transmission power of the uplink signal based on a power correction value obtained from a second TPC command when the terminal is in a second state.

Claims

1. A terminal which communicates with a base station, the terminal comprising:

a reception unit which detects a transmission power control (TPC) command in a downlink control information format and obtains a power correction value from the TPC command; and

a transmission power control unit which sets transmission power of an uplink signal based on a power correction value obtained from a first TPC command in a case where the terminal is in a first state and sets transmission power of the uplink signal based on a power correction value obtained from a second TPC command in a case where the terminal is in a second state.

2. The terminal according to claim 1,

wherein the transmission power control unit performs transmission power control of a first uplink signal based on the power correction value obtained from the first TPC command and performs transmission power control of a second uplink signal based on the power correction value obtained from the second TPC command.

3. The terminal according to claim 1,

wherein the reception unit obtains a power correction value as the first TPC command in a case where the DCI format is detected in a first control channel region in the second state and obtains power correction values of the first TPC command and the second TPC command in a case where the DCI format is detected in a second control channel region in the second state.

4. The terminal according to claim 1,

wherein the reception unit obtains a power correction value for a physical uplink shared channel (PUSCH) from the first TPC command and obtains a power correction value for a sounding reference signal (SRS) from the second TPC command.

5. The terminal according to claim 1,

wherein the transmission power control unit further sets the transmission power of the uplink signal based on the power correction value obtained from the first TPC command in the case where the terminal is in the second state.

6. A method for a terminal which communicates with a base station, the method comprising:

detecting a transmission power control (TPC) command in a downlink control information format and obtaining a power correction value from the TPC command;

setting transmission power of an uplink signal based on a power correction value obtained from a first TPC command in a case where the terminal is in a first state; and

setting the transmission power of the uplink signal based on a power correction value obtained from a second TPC command in a case where the terminal is in a second state.

7. The method according to claim 6,

wherein transmission power control of a first uplink signal is performed based on the power correction value obtained from the first TPC command, and transmission power control of a second uplink signal is performed based on the power correction value obtained from the second TPC command.

8. The method according to claim 6,

wherein a power correction value is obtained as the first TPC command in a case where the DCI format is detected in a first control channel region in the second state,

wherein power correction values of the first TPC command and the second TPC command are obtained in a case where the DCI format is detected in a second control channel region in the second state.

9. The method according to claim 6,

wherein a power correction value for a physical uplink shared channel (PUSCH) is obtained from the first TPC command, and a power correction value for a sounding reference signal (SRS) is obtained from the second TPC command.

10. The method according to claim 6,

wherein the transmission power of the uplink signal is further set based on the power correction value obtained from the first TPC command in the case where the terminal is in the second state.

11-15. -15. (canceled)

16. A base station which communicates with a terminal, the base station comprising:

a transmission unit which transmits

a downlink control information (DCI) format including a first transmission power control (TPC) command to the terminal configured in a first state and

a DCI format including a second TPC command to the terminal configured in a second state.

17-18. -18. (canceled)