Channel state information feedback method, device and system

1. A Channel State Information (CSI) feedback method, comprising:

configuring, by a network side device, a first downlink channel measurement pilot for a User Equipment (UE);

receiving, by the network side device, first Pre-coding Matrix Indicator (PMI) information fed back by the UE; and

configuring, by the network side device, second Pre-coding Matrix Indicator (PMI) for the UE to enable the UE to determine the first PMI information based on the second PMI information configured for the UE and the first downlink channel measurement pilot and determine the CQI information based on the first PMI information and the second PMI information configured for the UE,

wherein the first PMI information being acquired by the UE based on measurement of the first downlink channel measurement pilot and second PMI information, and

wherein a dimension represented by the first PMI information is different from a dimension represented by the second PMI information.

2. The CSI feedback method according to claim 1 , further comprising: performing, by the network side device, a beamforming operation on a signal to be transmitted to the UE based on the first PMI information and the second PMI information.

3. The CSI feedback method according to claim 1 , further comprising: receiving, by the network side device, Channel Quality Indicator (CQI) information fed back by the UE, the CQI information being determined by the UE based on the first PMI information and the second PMI information.

4. The CSI feedback method according to claim 3 , further comprising: performing, by the network side device, a link adjustment on the signal to be transmitted to the UE based on the CQI information.

5. The CSI feedback method according to claim 1 , wherein a step of determining, by the network side device, the second PMI information comprises:

receiving, by the network side device, the second PMI information reported by the UE; or

measuring, by the network side device, an uplink signal from the UE to determine the second PMI information.

6. The CSI feedback method according to claim 5 , further comprising, prior to receiving, by the network side device, the second PMI information reported by the UE:

configuring, by the network side device, a second downlink channel measurement pilot for the UE to enable the UE to determine the second PMI information based on the second downlink channel measurement pilot; or

configuring, by the network side device, a two-dimensional joint antenna array downlink channel measurement pilot for the UE to enable the UE to determine the second PMI information based on the two-dimensional joint antenna array downlink channel measurement pilot.

7. The CSI feedback method according to claim 6 , wherein the configuring, by the network side device, second PMI information for the UE comprises:

transmitting, by the network side device, the second PMI information to the UE to enable the UE to determine the first PMI information based on the received second PMI information, the first downlink channel measurement pilot and the second downlink channel measurement pilot in the event that the network side device configures the second downlink channel measurement pilot for the UE, and enable the UE to determine the first PMI information based on the received second PMI information and the two-dimensional joint antenna array downlink channel measurement pilot in the event that the network side device configures the two-dimensional joint antenna array downlink channel measurement pilot for the UE; or

notifying, by the network side device, the UE to use the second PMI information determined by the UE to enable the UE to determine the first PMI information based on the second PMI information determined by the UE, the first downlink channel measurement pilot and the second downlink channel measurement pilot in the event that the network side device configures the second downlink channel measurement pilot for the UE, and enable the UE to determine the first PMI information based on the second PMI information determined by the UE and the two-dimensional joint antenna array downlink channel measurement pilot in the event that the network side device configures the two-dimensional joint antenna array downlink channel measurement pilot for the UE.

8. A Channel State Information (CSI) feedback method, comprising:

determining, by a User Equipment (UE), first Pre-coding Matrix Indicator (PMI) information;

feeding, by the UE, the first PMI information back to the network side device; and

determining, by the UE, second Pre-coding Matrix Indicator (PMI) information,

wherein the first PMI information is determined based on the second PMI information and a first downlink channel measurement pilot configured by a network side device to enable the UE to determine the first PMI information based on the second PMI information configured for the UE and the first downlink channel measurement pilot and determine the CQI information based on the first PMI information and the second PMI information configured for the UE, and

wherein a dimension represented by the first PMI information is different from a dimension represented by the second PMI information.

9. The CSI feedback method according to claim 8 , further comprising:

determining, by the UE, Channel Quality Indicator (CQI) information based on the first PMI information and the second PMI information; and

feeding, by the UE, the CQI information back to the network side device.

10. The CSI feedback method according to claim 8 , wherein a step of determining, by the UE, the second PMI information comprises:

measuring, by the UE, a downlink pilot signal to determine the second PMI information; or

determining, by the UE, the second PMI information based on second PMI information configured by the network side device.

11. The CSI feedback method according to claim 10 , wherein the measuring, by the UE, a downlink pilot signal to determine the second PMI information comprises:

measuring, by the UE, a second downlink channel measurement pilot or a two-dimensional joint antenna array downlink channel measurement pilot configured by the network side device to determine the second PMI information, and

the determining, by the UE, first PMI information based on second PMI information and a first downlink channel measurement pilot configured by a network side device comprises:

determining, by the UE, the first PMI information based on the second PMI information, and the first downlink channel measurement pilot configured by the network side and the second downlink channel measurement pilot; or

measuring, by the UE, a downlink pilot signal based on the second PMI information and the two-dimensional joint antenna array downlink channel measurement pilot configured by the network side device to determine the first PMI information.

12. The CSI feedback method according to claim 10 , further comprising, subsequent to the step of measuring, by the UE, the downlink pilot signal to determine the second PMI information:

reporting, by the UE, the determined second PMI information to the network side device.

13. The CSI feedback method according to claim 12 , further comprising, subsequent to the step of reporting, by the UE, the determined second PMI information to the network side device:

after the UE receives the second PMI information from the network side device, using the received second PMI information as second PMI information for determining the first PMI information and the CQI information; or

after the UE receives an acknowledgement message from the network side device, using the reported second PMI information as second PMI information for determining the first PMI information and the CQI information.

14. A network side device, comprising:

a processor;

a memory connected to the processor via a bus interface and configured to store programs and data used when the processor performs an operation; and

a transceiver connected to the processor and the memory via the bus interface and configured to receive and transmit data under the control of the processor,

wherein the processor is further configured to call and execute the programs and data stored in the memory to: configure a first downlink channel measurement pilot for a User Equipment (UE), receive first PMI information from the UE, and configure second Pre-coding Matrix Indicator (PMI) for the UE to enable the UE to determine the first PMI information based on the second PMI information configured for the UE and the first downlink channel measurement pilot and determine the CQI information based on the first PMI information and the second PMI information configured for the UE,

wherein the first PMI information is acquired by the UE based on measurement of the first downlink channel measurement pilot and second PMI information, and

a dimension represented by the first PMI information is different from a dimension represented by the second PMI information.

15. The network side device according to claim 14 , wherein the processor further performs a beamforming operation on a signal to be transmitted to the UE based on the first PMI information and the second PMI information.

16. The network side device according to claim 14 , wherein the processor further receives Channel Quality Indicator (CQI) information fed back by the UE, the CQI information being determined by the UE based on the first PMI information and the second PMI information.

17. A User Equipment (UE), comprising:

a processor;

a memory connected to the processor via a bus interface and configured to store programs and data used when the processor performs an operation; and

a transceiver connected to the processor and the memory via the bus interface and configured to receive and transmit data under the control of the processor,

wherein the processor is further configured to call and execute the programs and data stored in the memory to: determine first Pre-coding Matrix Indicator (PMI) information, feed the first PMI information back to the network side device, and determine second Pre-coding Matrix Indicator (PMI) information,

wherein the first PMI information is determined based on the second PMI information and a first downlink channel measurement pilot configured by a network side device to enable the UE to determine the first PMI information based on the second PMI information configured for the UE and the first downlink channel measurement pilot and determine the CQI information based on the first PMI information and the second PMI information configured for the UE, and a dimension represented by the first PMI information is different from a dimension represented by the second PMI information.

18. The UE according to claim 17 , wherein the processor further determines Channel Quality Indicator (CQI) information based on the first PMI information and the second PMI information; and feeds the CQI information back to the network side device.

19. The UE according to claim 17 , wherein the processor further measures a downlink pilot signal to determine the second PMI information; or determines the second PMI information based on second PMI information configured by the network side device.