Terminal, base station, and channel information obtaining method

A channel information obtaining method, comprising:

• receiving, by a terminal, a downlink reference signal from a base station, wherein the downlink reference signal is used to obtain second channel information, and the second channel information is used to indicate partial channel state information of channels between the base station and the terminal;
• sending, by the terminal, an uplink reference signal to the base station, wherein the uplink reference signal is used to obtain first channel information, and the first channel information is used to indicate channel state matrix information of some of the channels between the base station and the terminal;
• and
• sending, by the terminal, the second channel information to the base station, wherein the first channel information and the second channel information are used to obtain channel state matrix information of the channels between the base station and the terminal.

A base station, comprising:

• a processor,
• a transmitter, and
• a receiver, wherein the processor is configured to:
• send a downlink reference signal to a terminal using the transmitter, wherein the downlink reference signal is used to obtain second channel information, and the second channel information is used to indicate partial channel state information of channels between the base station and the terminal;
• receive an uplink reference signal from the terminal using the receiver, wherein the uplink reference signal is used to obtain first channel information, and the first channel information is used to indicate channel state matrix information of some of the channels between the base station and the terminal;
• and
• receive the second channel information from the terminal using the receiver, wherein the first channel information and the second channel information are used to obtain channel state matrix information of the channels between the base station and the terminal.

A terminal, comprising:

• a processor,
• a receiver, and
• a transmitter, wherein the processor is configured to:
• receive a downlink reference signal from a base station using the receiver, wherein the downlink reference signal is used to obtain second channel information, and the second channel information is used to indicate partial channel state information of channels between the base station and the terminal;
• send an uplink reference signal to the base station using the transmitter, wherein the uplink reference signal is used to obtain first channel information, and the first channel information is used to indicate channel state matrix information of some of the channels between the base station and the terminal;
• and
• send the second channel information to the base station using the transmitter, wherein the first channel information and the second channel information are used to obtain channel state matrix information of the channels between the base station and the terminal.