METHOD AND APPARATUS TO SUPPORT SINGLE USER (SU) AND MULTIUSER (MU) BEAMFORMING WITH ANTENNA ARRAY GROUPS
First Claim
1. A method for beamforming at an evolved Node B (eNB) using antenna groups, the method comprising:
- precoding a plurality of data streams;
beamforming each of the data streams, wherein the beamforming comprises selecting a beamforming vector from a codebook such that one beamforming vector is selected per antenna array group;
providing each of the beamformed data streams to one of a plurality of antenna array groups; and
transmitting an antenna configuration from at least one of the plurality of antenna array groups.
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Abstract
A method and apparatus are used to support single user (SU) and multiuser (MU) beamforming with antenna array groups. The method and apparatus are used to precode a plurality of data streams, beamform each of the data streams, and provide each of the beamformed data streams to one of a plurality of antenna array groups. An alternate method and apparatus are used to select a beamforming vector from a codebook, transmit a common reference signal (RS) based on the selection, receive an antenna configuration responsive to the common RS, estimate channels based on the antenna configuration, determine beamforming vectors for a plurality of antenna array groups, and transmit the beamforming vectors.
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Citations
20 Claims
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1. A method for beamforming at an evolved Node B (eNB) using antenna groups, the method comprising:
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precoding a plurality of data streams; beamforming each of the data streams, wherein the beamforming comprises selecting a beamforming vector from a codebook such that one beamforming vector is selected per antenna array group; providing each of the beamformed data streams to one of a plurality of antenna array groups; and transmitting an antenna configuration from at least one of the plurality of antenna array groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for beamforming at a wireless transmit/receive unit (WTRU) using antenna groups comprising:
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receiving a common reference signal (CRS) and an antenna configuration; estimating channels based on the CRS and antenna configuration; selecting beamforming vectors for a plurality of antenna array groups, wherein the selecting the beamforming vectors is performed using a different codebook for each of the plurality of antenna array groups on a condition the each of the plurality of antenna array groups comprises a different number of antennas; and transmitting an index of the beamforming vectors. - View Dependent Claims (11, 12)
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13. An evolved Node B (eNB) comprising:
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a processor configured to precode a plurality of data streams, beamform each of the data streams such that one beamforming vector is selected per antenna array group, and provide each of the beamformed data streams to one of a plurality of antenna array groups; and a transmitter configured to transmit an antenna configuration from at least one of the plurality of antenna array groups. - View Dependent Claims (14, 15)
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16. A wireless transmit/receive unit (WTRU) comprising:
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a receiver configured to receive an antenna configuration; a processor configured to estimate channels based on the antenna configuration and select beamforming vectors for a plurality of antenna array groups using a different codebook for each of the plurality of antenna array groups on a condition the each of the plurality of antenna array groups comprises a different number of antennas; and a transmitter configured to transmit an index of the beamforming vectors. - View Dependent Claims (17, 18, 19, 20)
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Specification