Method for precoding matrix indicator feedback and apparatus
First Claim
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1. A method, comprising:
- receiving, by a terminal device, a reference signal from a base station;
based on the received reference signal, determining, by the terminal device, a precoding matrix W in a precoding matrix set corresponding to a rank indication, wherein W satisfies W=W1×
W2×
W3, W is a matrix of Nt rows and R columns, Nt is a quantity of antenna ports, R is a rank value corresponding to the rank indication, Nt is an even number and Nt is greater than or equal to R, wherein W1 is a matrix of Nt rows and 2M columns, W2 is a matrix of 2M rows and 2K columns, W3 is a matrix of 2K rows and R columns, K is less than M, wherein Nt, R, M, and K are all positive integers, M is greater than or equal to 2, none of W1, W2, and W3 is an identity matrix, and the 2M columns in W1 comprise every column in W1×
W2, wherein a first precoding matrix indicator corresponds to the first precoding matrix W1, a second precoding matrix indicator corresponds to the second precoding matrix W2, and a third precoding matrix indicator corresponds to the third precoding matrix W3;
sending, by the terminal device, the rank indication, the first precoding matrix indicator, the second precoding matrix indicator, and the third precoding matrix indicator to the base station; and
receiving, by the terminal device, data which is precoded using a precoding matrix determined by the base station based on the rank indication, the first precoding matrix indicator, the second precoding matrix indicator and the third precoding matrix indicator.
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Abstract
A method and apparatus for precoding matrix indicator feedback reduce a quantity of bits in the feedback. In the method, a terminal device receive a reference signal from a base station, determines a precoding matrix W in a precoding matrix set corresponding to a rank indication. W satisfies W=W1×W2×W3, W1, W2 and W3 and matrices and respectively corresponding to a first, second and third precoding matrix indicator. None of W1, W2, and W3 is an identity matrix, and the 2M columns in W1 comprise every column in W1×W2. The terminal device transmits the rank indication, the first precoding matrix indicator, the second precoding matrix indicator, and the third precoding matrix indicator to the base station. Therefore, a quantity of to-be-selected vectors is reduced by using a first-stage feedback and a second-stage feedback, thereby reducing calculation complexity of third-stage feedback, and reducing a quantity of bits in the third-stage feedback.
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Citations
14 Claims
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1. A method, comprising:
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receiving, by a terminal device, a reference signal from a base station; based on the received reference signal, determining, by the terminal device, a precoding matrix W in a precoding matrix set corresponding to a rank indication, wherein W satisfies W=W1×
W2×
W3, W is a matrix of Nt rows and R columns, Nt is a quantity of antenna ports, R is a rank value corresponding to the rank indication, Nt is an even number and Nt is greater than or equal to R, wherein W1 is a matrix of Nt rows and 2M columns, W2 is a matrix of 2M rows and 2K columns, W3 is a matrix of 2K rows and R columns, K is less than M, wherein Nt, R, M, and K are all positive integers, M is greater than or equal to 2, none of W1, W2, and W3 is an identity matrix, and the 2M columns in W1 comprise every column in W1×
W2, wherein a first precoding matrix indicator corresponds to the first precoding matrix W1, a second precoding matrix indicator corresponds to the second precoding matrix W2, and a third precoding matrix indicator corresponds to the third precoding matrix W3;sending, by the terminal device, the rank indication, the first precoding matrix indicator, the second precoding matrix indicator, and the third precoding matrix indicator to the base station; and receiving, by the terminal device, data which is precoded using a precoding matrix determined by the base station based on the rank indication, the first precoding matrix indicator, the second precoding matrix indicator and the third precoding matrix indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus, comprising:
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a receiver, configured to receive a reference signal from a base station; a processor, configured to;
based on the received reference signal, determine a precoding matrix W in a precoding matrix set corresponding to a rank indication, wherein W satisfies W=W1×
W2×
W3, W is a matrix of Nt rows and R columns, Nt is a quantity of antenna ports, R is a rank value corresponding to the rank indication, Nt is an even number and Nt is greater than or equal to R, wherein W1 is a matrix of Nt rows and 2M columns, W2 is a matrix of 2M rows and 2K columns, W3 is a matrix of 2K rows and R columns, K is less than M, wherein Nt, R, M, and K are all positive integers, M is greater than or equal to 2, none of W1, W2, and W3 is an identity matrix, and the 2M columns in W1 comprise every column in W1×
W2, wherein a first precoding matrix indicator corresponds to the first precoding matrix W1, a second precoding matrix indicator corresponds to the second precoding matrix W2, and a third precoding matrix indicator corresponds to the third precoding matrix W3; anda transmitter, configured to send the rank indication, the first precoding matrix indicator, the second precoding matrix indicator, and the third precoding matrix indicator to the base station, wherein the receiver is further configured to receive data which is precoded using a precoding matrix determined by the base station based on the rank indication, the first precoding matrix indicator, the second precoding matrix indicator and the third precoding matrix indicator. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification
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Current AssigneeHuawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
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Original AssigneeHuawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
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InventorsZhang, Ruiqi, Liu, Jianqin
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Primary Examiner(s)Patel, Dhaval V
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Application NumberUS16/148,296Publication NumberTime in Patent Office351 DaysField of Search375260, 375262, 375265, 375267, 375295, 375316, 375340, 375343, 375346, 370203, 370204, 370208, 370209US Class CurrentCPC Class CodesH04B 7/0478 Special codebook structures...H04B 7/0639 Using selective indices, e....H04B 7/0658 Feedback reductionH04L 1/06 using space diversityH04W 84/042 Public Land Mobile systems,...
