Base station device, user equipment, and method for reporting channel state information

1. A base station device, comprising: a transmitter, a receiver, and a processor telecommunicatively connected to the the transmitter and the receiver, wherein

the transmitter is configured to: send aperiodic channel state information (CSI) triggering signaling to a terminal device on a first downlink subframe, wherein the aperiodic CSI triggering signaling instructs the terminal device to send an aperiodic CSI measurement result of a first downlink subframe set; and

the receiver is configured to: receive at least one piece of aperiodic CSI from the terminal device, wherein the at least one piece of aperiodic CSI corresponds to an aperiodic CSI measurement result on a first reference subframe, wherein

the aperiodic CSI measurement result on the first reference subframe is the aperiodic CSI measurement result of the first downlink subframe set, and the first reference subframe is a subframe in the first downlink subframe set; and

there is no any subframe in the first downlink subframe set between the first downlink subframe and a second subframe, the second subframe is the fourth subframe prior to a first uplink subframe, and the first uplink subframe is a subframe bearing one piece of aperiodic CSI among the at least one piece of aperiodic CSI.

2. The base station device according to claim 1 , wherein

the first reference subframe is a subframe with the smallest index in the first downlink subframe set.

3. A terminal device, comprising: a transmitter, a receiver, and a processor telecommunicatively connected with the transmitter and the receiver, wherein

the receiver is configured to: receive, on a first downlink subframe, aperiodic channel state information (CSI) triggering signaling from a base station device, wherein the aperiodic CSI triggering signaling instructs the terminal device to send an aperiodic CSI measurement result of a first downlink subframe set;

the processor is configured to perform aperiodic CSI measurement to obtain an aperiodic CSI measurement result on a first reference subframe; and

the transmitter, configured to send at least one piece of aperiodic CSI to the base station device, wherein the at least one piece of aperiodic CSI information corresponds to the aperiodic CSI measurement result on the first reference subframe, wherein

the aperiodic CSI measurement result on the first reference subframe is the aperiodic CSI measurement result of the first downlink subframe set, and the first reference subframe is a subframe in the first downlink subframe set; and

there is no any subframe in the first downlink subframe set between the first downlink subframe and a second subframe, the second subframe is the fourth subframe prior to a first uplink subframe, and the first uplink subframe is a subframe bearing one piece of aperiodic CSI information among the at least one piece of aperiodic CSI.

4. The terminal device according to claim 3 , wherein

the first reference subframe is a subframe with the smallest index in the first downlink subframe set.

5. A method for receiving channel state information, comprising:

sending, by a base station device, aperiodic channel state information (CSI) triggering signaling to a terminal device on a first downlink subframe, wherein the aperiodic CSI triggering signaling instructs the terminal device to send an aperiodic CSI measurement result of a first downlink subframe set;

receiving, by the base station device, at least one piece of aperiodic CSI from the terminal device, wherein the at least one piece of aperiodic CSI corresponds to an aperiodic CSI measurement result on a first reference subframe, wherein

the aperiodic CSI measurement result on the first reference subframe is the aperiodic CSI measurement result of the first downlink subframe set, and the first reference subframe is a subframe in the first downlink subframe set; and

there is no any subframe in the first downlink subframe set between the first downlink subframe and a second subframe, the second subframe is the fourth subframe prior to a first uplink subframe, and the first uplink subframe is a subframe bearing one piece of aperiodic CSI among the at least one piece of aperiodic CSI.

6. The method according to claim 5 , wherein

the first reference subframe is a subframe with the smallest index in the first downlink subframe set.

7. A method for reporting channel state information, comprising:

receiving, by a terminal device on a first downlink subframe, aperiodic channel state information (CSI) triggering signaling from a base station device, wherein the aperiodic CSI triggering signaling instructs the terminal device to send an aperiodic CSI measurement result of a first downlink subframe set;

performing, by the terminal device, aperiodic CSI measurement to obtain an aperiodic CSI measurement result on a first reference subframe; and

sending, by the terminal device, at least one piece of aperiodic CSI to the base station device,

wherein the at least one piece of aperiodic CSI information corresponds to the aperiodic CSI measurement result on the first reference subframe, the aperiodic CSI measurement result on the first reference subframe is the aperiodic CSI measurement result of the first downlink subframe set, and the first reference subframe is a subframe in the first downlink subframe set; and

there is no any subframe in the first downlink subframe set between the first downlink subframe and a second subframe, the second subframe is the fourth subframe prior to a first uplink subframe, and the first uplink subframe is a subframe bearing one piece of aperiodic CSI information among the at least one piece of aperiodic CSI.

8. The method according to claim 7 , wherein

the first reference subframe is a subframe with the smallest index in the first downlink subframe set.