Method And Apparatus For Transmitting Reference Signal, And Method And Apparatus For Receiving Reference Signal

A method for transmitting signal, wherein the method comprising:

• receiving, by a terminal device, downlink control information (DCI) from a base station, the DCI includes a precoding matrix index, the precoding matrix index belongs to a first index set, wherein the precoding matrix index is used to determine a determine a precoding matrix for transmitting data by the terminal device, each index in the first index set corresponds to a precoding matrix in a first precoding matrix set, a second precoding matrix set comprises a codebook, the first precoding matrix set is a proper subset of the second precoding matrix set, and each precoding matrix index in the first index set has a value that is less than a quantity of precoding matrices comprised in the first precoding matrix set;
• and
• transmitting, by the terminal device, the data according to the precoding matrix index.

50-51. (canceled)

An apparatus for transmitting signal, comprising:

• a receiver, configured to receive downlink control information (DCI) from a base station, the DCI includes a precoding matrix index, the precoding matrix index belongs to a first index set, wherein the precoding matrix index is used to determine a determine a precoding matrix for transmitting data by the apparatus, each index in the first index set corresponds to a precoding matrix in a first precoding matrix set, a second precoding matrix set comprises a codebook, the first precoding matrix set is a proper subset of the second precoding matrix set, and each precoding matrix index in the first index set has a value that is less than a quantity of precoding matrices comprised in the first precoding matrix set;
• and
• a transmitter, configured to transmit the data according to the precoding matrix index.

56-57. (canceled)

62-63. (canceled)

67-75. (canceled)