BASE STATION AND METHOD

• US 20100232303A1
• Filed: 06/19/2007
• Published: 09/16/2010
• Est. Priority Date: 06/19/2006
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Harada, Atsushi, Abeta, Sadayuki, Ishii, Minami
• Granted Patent: US 8,345,706 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0033 arrangements specific to the transmitter
• CPC Class Codes: H04L 1/1664 the supervisory signal being transmitted together with payload signals; piggybacking
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A base station (eNodeB) performing a radio communication with a user equipment (UE) includes: a transmission format determining unit (16) configured to determine a transmission format of a downlink data channel not to be associated by a control channel, based on a downlink reception signal quality measured by the user equipment; a notification unit (18) configured to notify, to the user equipment, the transmission format determined by the transmission format determining unit; a transmission power controlling unit (19) configured to control a transmission power of the downlink data channel; and a transmitting unit (18) configured to transmit downlink data to the user equipment via the downlink data channel, by using the transmission format determined by the transmission format determining unit.

Claims

1. A base station performing a radio communication with a user equipment, comprising:

a transmission format determining unit configured to determine a transmission format of a downlink data channel not to be associated by a control channel, based on a downlink reception signal quality measured by the user equipment;

a notification unit configured to notify, to the user equipment, the transmission format determined by the transmission format determining unit;

a transmission power controlling unit configured to control a transmission power of the downlink data channel; and

a transmitting unit configured to transmit downlink data to the user equipment via the downlink data channel, by using the transmission format determined by the transmission format determining unit.

2. The base station according to claim 1, wherein the notification unit is configured to notify, to the user equipment, the transmission format determined by the transmission format determining unit, by using the downlink data channel.

3. The base station according to claim 1, wherein the notification unit is configured to notify, to the user equipment, the transmission format determined by the transmission format determining unit, by using an RRC signaling message.

4. The base station according to claim 1, wherein the notification unit is configured to notify, to the user equipment, the transmission format determined by the transmission format determining unit, by using an MAC control protocol data unit.

5. The base station according to claim 1, wherein

the transmitting unit is configured to transmit the downlink data via the downlink data channel, in a first cyclic period, and

the notification unit is configured to notify, to the user equipment, the transmission format determined by the transmission format determining unit, by using the control channel, in a second cyclic period that is longer than the first cyclic period.

6. The base station according to claim 5, wherein the transmission power controlling unit is configured to control the transmission power of the control channel.

7. The base station according to claim 1, wherein the transmission format determining unit is configured to determine the transmission format of the downlink data channel, based on the downlink reception signal quality multiplexed on a response signal for the downlink data channel, the response signal being transmitted from the user equipment.

8. The base station according to claim 1, wherein the transmission format determining unit is configured to determine the transmission format of the downlink data channel, based on the downlink reception signal quality multiplexed on an uplink data channel transmitted at a fixed timing in an uplink.

9. A method used in a base station performing a radio communication with a user equipment, comprising:

determining a transmission format of a downlink data channel not to be associated by a control channel, based on a downlink reception signal quality measured by the user equipment;

notifying, to the user equipment, the transmission format determined by the transmission format determining unit;

controlling a transmission power of the downlink data channel; and

transmitting downlink data to the user equipment via the downlink data channel, by using the transmission format determined by the transmission format determining unit.