BASE STATION APPARATUS, MOBILE STATION APPARATUS AND TRANSMISSION POWER CONTROL METHOD
First Claim
1. A base station apparatus comprising:
- a power control matrix generating section configured to generate a power control matrix reflecting average reception power of each of transmission signals from a plurality of transmission antennas;
an update section configured to update a codebook which beforehand defines a plurality of precoding weights corresponding to the power control matrix;
a selecting section configured to select precoding weights that maximize throughput or reception SINR obtained after combining the transmission signals from the updated codebook; and
a transmission power control section configured to control transmission power of each of the transmission signals corresponding to the precoding weights selected in the selecting section.
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Accused Products
Abstract
To suppress deterioration of throughput characteristics in the entire system even when a plurality of transmission antennas is placed in an indoor environment, a base station apparatus (eNode B) is provided with a power control matrix generating section (508b) that generates a power control matrix (Sx) reflecting average reception power of each of transmission signals from a plurality of transmission antennas (TX#1 to TX#NTX), a codebook update section (508c) that updates a codebook which beforehand defines a plurality of precoding weights corresponding to the power control matrix (Sx), a precoding weight selecting section (508d) that selects precoding weights that maximize throughput or reception SINR obtained after combining the transmission signals from the updated codebook, and a precoding multiplying section (transmission power control section) (507) that controls transmission power of each of the transmission signals corresponding to the selected precoding weights.
51 Citations
14 Claims
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1. A base station apparatus comprising:
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a power control matrix generating section configured to generate a power control matrix reflecting average reception power of each of transmission signals from a plurality of transmission antennas; an update section configured to update a codebook which beforehand defines a plurality of precoding weights corresponding to the power control matrix; a selecting section configured to select precoding weights that maximize throughput or reception SINR obtained after combining the transmission signals from the updated codebook; and a transmission power control section configured to control transmission power of each of the transmission signals corresponding to the precoding weights selected in the selecting section. - View Dependent Claims (2, 3, 4, 5)
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6. A mobile station apparatus comprising:
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an average reception power measuring section configured to measure average reception power of each of transmission signals from a plurality of transmission antennas of a base station apparatus; a power control matrix generating section configured to generate a power control matrix reflecting the average reception power; an update section configured to update a codebook which beforehand defines a plurality of precoding weights corresponding to the power control matrix; a selecting section configured to select precoding weights that maximize throughput or reception SINR obtained after combining the transmission signals from the updated codebook; and a transmission section configured to transmit, to the base station apparatus, information on the average reception power measured in the average reception power measuring section and on the precoding weights selected in the selecting section. - View Dependent Claims (7, 8)
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9. A mobile communication system in which transmission signals are transmitted from a plurality of transmission antennas of a base station apparatus by spatial multiplexing transmission, and a mobile station apparatus divides the transmission signals to obtain a reception signal, comprising:
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the mobile station apparatus having an average reception power measuring section configured to measure average reception power of each of the transmission signals from the plurality of transmission antennas; a first precoding weight determining section configured to generate a power control matrix reflecting the average reception power, to update a plurality of beforehand defined precoding weights corresponding to the power control matrix, and to select optimal precoding weights from the updated precoding weights; and a transmission section configured to transmit, to the base station apparatus, information on the average reception power and on the optimal precoding weights; and the base station apparatus having a second precoding weight determining section configured to generate a power control matrix reflecting the average reception power transmitted from the mobile station apparatus, to update a plurality of beforehand defined precoding weights corresponding to the power control matrix, and to select optimal precoding weights from the updated precoding weights corresponding to the information on the optimal precoding weights transmitted from the mobile station apparatus; and a transmission power control section configured to control transmission power of each of the transmission signals corresponding to the precoding weights selected in the second precoding weight determining section. - View Dependent Claims (10, 11)
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12. A transmission power control method in a base station apparatus for transmitting transmission signals from a plurality of transmission antennas to a mobile station apparatus by spatial multiplexing transmission, comprising:
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in the mobile station apparatus, measuring average reception power of each of the transmission signals from the plurality of transmission antennas; generating a power control matrix reflecting the average reception power, updating a plurality of beforehand defined precoding weights corresponding to the power control matrix, and selecting optimal precoding weights from the updated precoding weights; and transmitting, to the base station apparatus, information on the average reception power and on the optimal precoding weights; and in the base station apparatus, generating a power control matrix reflecting the average reception power transmitted from the mobile station apparatus, updating a plurality of beforehand defined precoding weights corresponding to the power control matrix, and selecting optimal precoding weights from the updated precoding weights corresponding to the information on the optimal precoding weights transmitted from the mobile station apparatus; and controlling transmission power of each of the transmission signals corresponding to the selected optimal precoding weights. - View Dependent Claims (13, 14)
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Specification