METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CSI-RS IN MASSIVE MIMO SYSTEM OPERATING IN FDD MODE
First Claim
1. A beamforming method of a transmitter using a plurality of antenna ports in a wireless communication system, the beamforming method comprising the steps of:
- generating signals for beams to be transmitted through corresponding antenna ports;
forming the beams by precoding the signals with beamforming vectors;
sorting the beams into a number of resource reuse groups based on a resource that is to be shared;
transmitting the beams, using resources allocated per group, to a receiver;
selecting a beam having a greatest gain for a transmitter using feedback information on at least one of the antenna ports, which is transmitted by the receiver; and
allocating a transmission resource for the selected beam.
1 Assignment
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Accused Products
Abstract
Methods and apparatus are provided for beamforming and information feedback are provided. Signals for beams to be transmitted through corresponding antenna ports, are generated. The beams are formed by precoding the signals with beamforming vectors. The beams are sorted into a number of resource reuse groups based on a resource that is to be shared. The beams are transmitted, using resources allocated per group, to a receiver. Feedback information is generated on at least one antenna port, based on the received beams. The feedback information is transmitted to the transmitter. A beam is selected having a greatest gain for a transmitter using the feedback information. A transmission resource is allocated for the selected beam.
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Citations
18 Claims
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1. A beamforming method of a transmitter using a plurality of antenna ports in a wireless communication system, the beamforming method comprising the steps of:
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generating signals for beams to be transmitted through corresponding antenna ports; forming the beams by precoding the signals with beamforming vectors; sorting the beams into a number of resource reuse groups based on a resource that is to be shared; transmitting the beams, using resources allocated per group, to a receiver; selecting a beam having a greatest gain for a transmitter using feedback information on at least one of the antenna ports, which is transmitted by the receiver; and allocating a transmission resource for the selected beam. - View Dependent Claims (2, 3, 4)
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5. An information feedback method in a wireless communication system, the information feedback method comprising the steps of:
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receiving beams sorted into a number of resource reuse groups through resources allocated for respective resource reuse groups, from a transmitter; generating feedback information on at least one antenna port, based on the received beams, for use in determining a beam having a greatest gain at the transmitter; and transmitting the feedback information to the transmitter, wherein the beams are formed by precoding per-beam signals to be transmitted through respective antenna ports of the transmitter with respective beamforming vectors. - View Dependent Claims (6, 7, 8, 9, 12, 13)
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10. A transmitter equipped with a plurality of antenna ports for beamforming in a wireless communication system, the transmitter comprising:
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a radio communication unit that communicates signals with a receiver; and a control unit that controls generation of signals for beams to be transmitted through corresponding antenna ports, formation of the beams by precoding the signals with beamforming vectors, sorting of the beams into a number of resource reuse groups based on a resource that is to be shared, transmission of the beams, using resources allocated per group, to a receiver, selection of a beam having a greatest gain for the transmitter using feedback information on at least one of the antenna ports, which is transmitted by the receiver, and allocation of a transmission resource for the selected beam. - View Dependent Claims (11)
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14. A receiver for transmitting feedback information to a transmitter in a wireless communication system, the receiver comprising:
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a radio communication unit which communicates signals with the transmitter; and a control unit which controls reception of beams sorted into a number of resource reuse groups through resources allocated for respective resource reuse groups, from a transmitter, generation of feedback information on at least one antenna port, based on the received beams, for use in determining a beam having a greatest gain at the transmitter, and transmission of the feedback information to the transmitter, wherein the beams are formed by precoding per-beam signals to be transmitted through respective antenna ports of the transmitter with respective beamforming vectors. - View Dependent Claims (15, 16, 17, 18)
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Specification