Radio base station apparatus, radio communication system and radio communication method
First Claim
1. A radio base station apparatus comprising:
- a plurality of transmitting antennas;
a weight multiplication section that, when at least one of a downlink control channel, a broadcast channel and a cell-specific reference signal is transmitted with fewer transmission layers than a number of all transmitting antennas, a smaller number of antennas than the number of all transmitting antennas are made virtual, and transmission signals are multiplied by transmission weights that make an average transmission power of each of the transmitting antennas or transmission streams the same; and
a transmission section that transmits signals multiplied by the transmission weights in the weight multiplication section from the transmitting antennas.
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Accused Products
Abstract
The present invention is designed to implement radio communication to maintain good communication quality even when the number of antennas provided in a radio base station apparatus is greater than the number of transmission layers of a downlink control channel, a broadcast channel, and cell-specific reference signals. When, from a radio base station apparatus (200) having a plurality of transmitting antennas, at least one of a downlink control channel, a broadcast channel and a cell-specific reference signal is transmitted with fewer transmission layers than the number of all transmitting antennas, a smaller number of antennas than the number of all transmitting antennas are made virtual in a precoding weight multiplication section (205), and also transmission weights that make the average transmission power of the transmitting antennas or transmission streams the same are multiplied, and the signals multiplied by the transmission weights are transmitted from the transmitting antennas on the downlink.
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Citations
21 Claims
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1. A radio base station apparatus comprising:
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a plurality of transmitting antennas; a weight multiplication section that, when at least one of a downlink control channel, a broadcast channel and a cell-specific reference signal is transmitted with fewer transmission layers than a number of all transmitting antennas, a smaller number of antennas than the number of all transmitting antennas are made virtual, and transmission signals are multiplied by transmission weights that make an average transmission power of each of the transmitting antennas or transmission streams the same; and a transmission section that transmits signals multiplied by the transmission weights in the weight multiplication section from the transmitting antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A radio communication system comprising:
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a radio base station apparatus comprising; a plurality of transmitting antennas; a weight multiplication section that, when at least one of a downlink control channel, a broadcast channel and a cell-specific reference signal is transmitted with fewer transmission layers than a number of all transmitting antennas, a smaller number of antennas than the number of all transmitting antennas are made virtual, and transmission signals are multiplied by transmission weights that make an average transmission power of each of the transmitting antennas or transmission streams the same; and a transmission section that transmits signals multiplied by the transmission weights in the weight multiplication section from the transmitting antennas; and a mobile station apparatus comprising; a receiving section that receives the signals from the radio base station apparatus; and a downlink channel demultiplexing section that demultiplexes the received signals received in the receiving section, into the reference signal, the control channel and the broadcast channel.
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21. A radio communication method comprising the steps of:
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when, from a radio base station apparatus having a plurality of transmitting antennas, at least one of a downlink control channel, a broadcast channel and a cell-specific reference signal is transmitted with fewer transmission layers than a number of all transmitting antennas, making a smaller number of antennas than the number of all transmitting antennas virtual, and multiplying transmission signals by transmission weights that make an average transmission power of each of the transmitting antennas or transmission streams the same; and transmitting signals multiplied by the transmission weights from the transmitting antennas.
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Specification