Feedback channel transmission and detection in multi antenna wireless communication systems
First Claim
1. A method by a network node in a communications system, the method comprising:
- determining a codebook subset restriction indicating a reduced set of precoding matrices out of an original set of precoding matrices in an original codebook, wherein a full set of Precoding Matrix Indicator, PMI, bits is used to identify the original set of precoding matrices in the original codebook;
determining a reduced set of PMI bits for use in a feedback channel based on a number of entries in the reduced set of precoding matrices, wherein the reduced set of PMI bits has fewer bits than the full set of PMI bits;
determining a mapping of the entries in the reduced set of precoding matrices to entries in the original set of precoding matrices; and
decoding signals from the feedback channel using the reduced set of PMI bits.
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Abstract
A method by a network node in a communications system includes determining a codebook subset restriction indicating a reduced set of precoding matrices out of an original set of precoding matrices in an original codebook. The full set of Precoding Matrix Indicator, PMI, bits is used to identify the original set of precoding matrices in the original codebook. The method includes determining a reduced set of Precoding Matrix Indicator, PMI, bits for use in a feedback channel based on a number of entries in the reduced set of precoding matrices. The reduced set of PMI bits has fewer bits than the full set of PMI bits. Related user equipments, methods by user equipments and network nodes are disclosed.
51 Citations
40 Claims
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1. A method by a network node in a communications system, the method comprising:
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determining a codebook subset restriction indicating a reduced set of precoding matrices out of an original set of precoding matrices in an original codebook, wherein a full set of Precoding Matrix Indicator, PMI, bits is used to identify the original set of precoding matrices in the original codebook; determining a reduced set of PMI bits for use in a feedback channel based on a number of entries in the reduced set of precoding matrices, wherein the reduced set of PMI bits has fewer bits than the full set of PMI bits; determining a mapping of the entries in the reduced set of precoding matrices to entries in the original set of precoding matrices; and decoding signals from the feedback channel using the reduced set of PMI bits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method by a user equipment in a communications system, the method comprising:
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determining a codebook subset restriction indicating a reduced set of precoding matrices out of an original set of precoding matrices in an original codebook, wherein a full set of Precoding Matrix Indicator, PMI, bits is used to identify the original set of precoding matrices in the original codebook; and generating a mapping rule based on the codebook subset restriction; and determining a reduced set of PMI bits based on a set of entries in the reduced set of precoding matrices wherein the reduced set of PMI bits has fewer bits than the full set of PMI bits. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A network node comprising:
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a transceiver configured to provide communication between the network node and a user equipment; and a processor coupled with the transceiver, wherein the processor is configured to perform operations comprising; determining a codebook subset restriction indicating a reduced set of precoding matrices out of an original set of precoding matrices in an original codebook, wherein a full set of Precoding Matrix Indicator, PMI, bits is used to identify the original set of precoding matrices in the original codebook; determining a reduced set of PMI bits for use in a feedback channel based on a number of entries in the reduced set of precoding matrices, wherein the reduced set of PMI bits has fewer bits than the full set of PMI bits; determining a mapping of the entries in the reduced set of precoding matrices to entries in the original set of precoding matrices; and receiving on the feedback channel, from the user equipment, a feedback message having the reduced set of PMI bits. - View Dependent Claims (32, 33, 34, 35)
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36. A user equipment comprising:
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a transceiver configured to provide communication between user equipment and a network node; and a processor coupled with the transceiver, wherein the processor is configured to perform operations comprising; determining a codebook subset restriction indicating a reduced set of precoding matrices out of an original set of precoding matrices in an original codebook, wherein a full set of Precoding Matrix Indicator, PMI, bits is used to identify the original set of precoding matrices in the original codebook; generating a mapping rule based on the codebook subset restriction; and determining a reduced set of PMI bits based on a set of entries in the reduced set of precoding matrices wherein the reduced set of PMI bits has fewer bits than the full set of PMI bits. - View Dependent Claims (37, 38, 39, 40)
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Specification