Method and apparatus for channel state information based on antenna mapping and subsampling
AssigneeSamsung Electronics Co., Ltd.
InventorsYang Li, Young-Han Nam, Eko Onggosanusi, Md. Saifur Rahman, Jianzhong Zhang
Life of this patent
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Abstract
Non-zero power channel state information reference signals (CSI-RS) are transmitted only on a subsampled pattern of antennas within an antenna array. Based on the transmitted CSI-RS, channel state information is determined for all antennas within the antenna array by, for example, precoder matrix indicator (PMI) interpolation or channel quality indicator (CQI) compensation. The determination of CSI for all antennas within the antenna array may be made by a user equipment receiving the subsampled CSI-RS or a base station transmitting the subsampled CSI-RS.
Claims23
A user equipment, comprising:
- a receiver configured to receive subsampling parameters for antenna ports for antennas within an antenna array, the subsampling parameters corresponding to non-zero power channel state information reference signals (CSI-RSs) transmitted by a base station on a first subset of the antenna ports and zero power CSI-RSs for a second subset of the antenna ports;
- a processor configured to determine channel state information (CSI) feedback for both the first and second subsets of antenna ports based on the sub-sampling parameters and the non-zero power CSI-RSs received for the first subset of antenna ports;
- and
- a transmitter configured to transmit, to the base station, the determined CSI feedback for both the first and second subsets of antenna ports.
A base station, comprising:
- a transmitter configured to transmit
- subsampling parameters for antenna ports for antennas within an antenna array, the subsampling parameters corresponding to non-zero power channel state information reference signals (CSI-RSs) for a first subset of the antenna ports and zero power CSI-RSs for a second subset of the antenna ports, and
- the non-zero power CSI-RSs;
- and
- a receiver configured to receive channel state information (CSI) feedback determined for both the first and second subsets of antenna ports based on the sub-sampling parameters and the non-zero power CSI-RSs received for the first subset of antenna ports.
The base station according to claim 12, wherein each set of subsampling parameters corresponds to at least one pattern corresponding to a two-dimensional (2D) antenna array, wherein the pattern is based upon one of alternating rows of the 2D antenna array, alternating columns of the 2D antenna array, or alternating non-adjacent antennas in both the rows and the columns of the antennas.
A base station, comprising:
- a transmitter configured to transmit channel state information reference signals (CSI-RSs) on a subset of antennas within an antenna array;
- a receiver configured to receive channel state information (CSI) feedback for the non-zero power CSI-RSs, the CSI feedback including at least one of a channel quality indicator (CQI) or a precoding matrix indicator (PMI) based on the non-zero power CSI-RSs transmitted on the subset of antennas;
- and
- a processor configured to determine at least one of a new CQI and a new PMI for all antennas within the antenna array based on at least one pattern of the subset of antennas within the antenna array and the received CSI feedback for the non-zero power CSI-RSs by one of PMI derivation or CQI derivation.
Dependencies are inferred from the claim text.