BASE STATION AND COMMUNICATION CONTROL METHOD
First Claim
1. A base station configured to transmit a radio signal to a user terminal in an own cell, the base station comprising:
- a controller configured to notify the user terminal of a multi-antenna transmission mode to be applied to a transmission of the radio signal; and
a transmitter configured to transmit the radio signal by using a plurality of transmission antennas by the multi-antenna transmission mode to the user,wherein the controller reduces a number of transmission antennas to be used for the transmission of the radio signal after notifying the user terminal of the multi-antenna transmission mode, andthe controller maintains the multi-antenna transmission mode, even when reducing the number of transmission antennas to be used for the transmission of the radio signal.
1 Assignment
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Accused Products
Abstract
A base station according to a first aspect is configured to transmit a radio signal to a user terminal in an own cell by using a plurality of transmission antennas. The base station comprises: a controller configured to notify the user terminal of a multi-antenna transmission mode to be applied to a transmission of the radio signal; and a transmitter configured to transmit the radio signal by using the plurality of transmission antennas by the multi-antenna transmission mode notified to the user terminal. The controller reduces a number of transmission antennas to be used for the transmission of the radio signal so as to reduce power consumption of the base station. The controller maintains the multi-antenna transmission mode notified to the user terminal without changing the multi-antenna transmission mode, even when reducing the number of transmission antennas to be used for the transmission of the radio signal.
11 Citations
13 Claims
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1. A base station configured to transmit a radio signal to a user terminal in an own cell, the base station comprising:
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a controller configured to notify the user terminal of a multi-antenna transmission mode to be applied to a transmission of the radio signal; and a transmitter configured to transmit the radio signal by using a plurality of transmission antennas by the multi-antenna transmission mode to the user, wherein the controller reduces a number of transmission antennas to be used for the transmission of the radio signal after notifying the user terminal of the multi-antenna transmission mode, and the controller maintains the multi-antenna transmission mode, even when reducing the number of transmission antennas to be used for the transmission of the radio signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A communication control method used in a base station configured to transmit a radio signal to a user terminal in an own cell, the communication control method comprising the steps of:
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notifying the user terminal of a multi-antenna transmission mode to be applied to a transmission of the radio signal; reducing a number of transmission antennas to be used for the transmission of the radio signal maintaining the multi-antenna transmission mode, even when reducing the number of transmission antennas to be used for the transmission of the radio signal; and transmitting the radio signal by the multi-antenna transmission mode.
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13. A processor for controlling a base station configured to transmit a radio signal to a user terminal in an own cell, the processor comprising the steps of:
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notifying the user terminal of a multi-antenna transmission mode to be applied to a transmission of the radio signal; reducing the number of transmission antennas to be used for the transmission of the radio signal; maintaining the multi-antenna transmission mode, even when reducing the number of transmission antennas to be used for the transmission of the radio signal; and transmitting the radio signal by the multi-antenna transmission mode.
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Specification