Channel state information transmission method, access network device, and terminal device
AssigneeHuawei Technologies Co., Ltd.
InventorsDi Zhang, Ruiqi Zhang
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Abstract
This application provides a channel state information transmission method, an access network device, and a terminal device. The method includes: receiving, by an access network device, CSI reported by a terminal device, where the CSI includes a first PMI and a second PMI; and determining, by the access network device based on the first PMI and the second PMI, a precoding matrix W whose rank is greater than or equal to 2, where W meets W=W1×W2, and the second PMI is used to indicate some column vectors in W2. According to the method in the embodiment, overheads of feeding back the CSI by the terminal device are effectively reduced.
Claims20
A channel state information transmission method, comprising:
- receiving, by an access network device, channel state information (CSI) reported by a terminal device, wherein the CSI comprises a first precoding matrix indicator (PMI) and a second PMI;
- and
- determining, by the access network device, a precoding matrix W based on the first PMI and the second PMI, wherein W satisfies W=W1×W2, wherein
- W1 is determined based on the first PMI, wherein W2 is determined based on the second PMI, and wherein when a rank of W is greater than or equal to 2, the terminal device needs to report only the second PMI used to indicate one or more column vectors in W2 to reduce overheads of feeding back, wherein the rank of the precoding matrix W is a dimension of a vector space generated by columns of W.
A channel state information transmission method, comprising:
- determining, by a terminal device, a precoding matrix W based on a reference signal delivered by an access network device, wherein W is defined as W=W1×W2;
- and
- sending, by the terminal device, channel state information (CSI) to the access network device, wherein the CSI comprises a first precoding matrix indicator (PMI) and a second PMI, wherein W1 is determined based on the first PMI, wherein W2 is determined based on the second PMI, and wherein when a rank of W is greater than or equal to 2, the terminal device needs to report only the second PMI used to indicate one or more column vectors in W2 to reduce overheads of feeding back, wherein the rank of the precoding matrix W is a dimension of a vector space generated by columns of W.
An apparatus, comprising a receiver, a processor, and a transmitter, wherein
- the processor is configured to determine a precoding matrix W based on a reference signal that is delivered by an access network device and that is received by the receiver, wherein W satisfies W=W1×W2;
- and
- the transmitter is configured to send channel state information (CSI) to the access network device, wherein the CSI comprises a first precoding matrix indicator (PMI) and a second PMI, wherein W1 is determined based on the first PMI, wherein W2 is determined based on the second PMI, and wherein when a rank of W is greater than or equal to 2, the terminal device needs to report only the second PMI used to indicate one or more column vectors in W2 to reduce overheads of feeding back, wherein the rank of the precoding matrix W is a dimension of a vector space generated by columns of W.
Dependencies are inferred from the claim text.