Method, device, and system for sending channel state information

1. A method for sending channel state information, comprising:

setting, by a base station, a number of bits used for quantizing a relative received power value, wherein the relative received power value is a difference between a received power of an antenna port of a UE (user equipment) measurement set and a minimum received power of all antenna ports of the UE measurement set;

determining, by the base station, a received power codebook according to the number of bits and the UE measurement set, wherein the received power codebook comprises multiple received power codebook elements, and each received power codebook element corresponds to a received power codebook index value;

sending, by the base station, the number of bits to the UE, so that the UE determines the received power codebook according to the number of bits and the UE measurement set;

receiving, by the base station, a first received power codebook index value sent by the UE, wherein the first received power codebook index value is selected from multiple received power codebook index values by the UE;

determining, by the base station, a first received power codebook element corresponding to the first received power codebook index value; and

processing, by the base station, a signal according to the first received power codebook element.

2. The method according to claim 1 , wherein the number of bits is equal to a number of antenna ports of the UE measurement set.

3. The method according to claim 1 , wherein the first received power codebook element carries first selection information and second selection information,

wherein the first selection information indicates that the received power from the antenna port is high received power, and

wherein the second selection information indicates that the received power from the antenna port is low received power.

4. The method according to claim 3 , wherein the processing, by the base station, the signal according to the first received power codebook element comprises:

selecting, by the base station, the antenna port to serve the UE according to the first selection information; and

refusing, by the base station, the antenna port to serve the UE according to the second selection information.

5. The method according to claim 3 , wherein the processing, by the base station, the signal according to the first received power codebook element comprises:

receiving, by the base station, channel state information (CSI) sent by the UE, wherein the CSI is obtained by the UE according to the first received power codebook element; and

performing, by the base station, precoding processing according to the CSI.

6. A method for sending channel state information, comprising:

receiving, by a UE (user equipment), a number of bits used for quantizing a relative received power value sent by a base station, wherein the relative received power value is a difference between a received power of an antenna port of a UE measurement set and a minimum received power of all antenna ports of the UE measurement set;

determining, by the UE, a received power codebook according to the number of bits and the UE measurement set, wherein the received power codebook comprises multiple received power codebook elements, and each received power codebook element corresponds to a received power codebook index value;

selecting, by the UE, a first received power codebook index value from multiple received power codebook index values; and

sending, by the UE, a first received power codebook index value to the base station, so that the base station determines a first received power codebook element corresponding to the first received power codebook index value and processes a signal according to the first received power codebook element.

7. The method according to claim 6 , wherein the number of bits is equal to a number of antenna ports of the UE measurement set.

8. The method according to claim 6 , wherein the first received power codebook element carries first selection information and second selection information,

wherein the first selection information indicates that the received power from the antenna port is high received power, and

wherein the second selection information indicates that the received power from the antenna port is low received power.

9. The method according to claim 6 , wherein the selecting, by the UE, the first received power codebook index value from the multiple received power codebook index values comprises:

measuring, by the UE, radio channels according to the number of antenna ports of the UE measurement set, so as to obtain the relative received power value, wherein the radio channels are radio channels from the base station to antenna ports of the UE measurement set;

quantizing, by the UE, the relative received power value according to the number of bits; and

selecting, by the UE, the first received power codebook index value from multiple received power codebook index values according to the quantized relative received power value.

10. The method according to claim 9 , further comprising:

measuring, by the UE, rank indication (RI), channel quality indication information (CQI), or a precoding matrix index (PMI) after selecting the first received power codebook index value.

11. The method according to claim 10 , wherein a first transmission period is longer than or equal to a second transmission period,

wherein the first transmission period refers to a signal period for periodically sending the first received power codebook index value, and

wherein the second transmission period refers to a signal period for periodically sending the RI.

12. A base station, comprising:

a setting unit, configured to set a number of bits used for quantizing a relative received power value, wherein the relative received power value is a difference between a received power of an antenna port of a UE (user equipment) measurement set and a minimum received power of all antenna ports of the UE measurement set;

a determining unit, configured to determine a received power codebook according to the number of bits and the UE measurement set, wherein the received power codebook comprises multiple received power codebook elements, and each received power codebook element corresponds to a received power codebook index value;

a first sending unit, configured to send the number of bits to the UE, so that the UE determines the received power codebook according to the number of bits and the UE measurement set;

a first receiving unit, configured to receive a first received power codebook index value sent by the UE, wherein the first received power codebook index value is selected from multiple received power codebook index values by the UE;

the determining unit is further configured to determine a first received power codebook element corresponding to the first received power codebook index value; and

a processing unit, configured to process a signal according to the first received power codebook element.

13. The base station according to claim 12 , wherein the number of bits is equal to a number of antenna ports of the UE measurement set.

14. The base station according to claim 12 , wherein the first received power codebook element carries first selection information and second selection information,

wherein the first selection information indicates that the received power from the antenna port is high received power, and

wherein the second selection information indicates that the received power from the antenna port is low received power.

15. The base station according to claim 14 , wherein the processing the signal according to the first received power codebook element comprises:

selecting the antenna port to serve the UE according to the first selection information; and

refusing the antenna port to serve the UE according to the second selection information.

16. The base station according to claim 14 , wherein the processing the signal according to the first received power codebook element comprises:

receiving channel state information (CSI) sent by the UE, wherein the CSI is obtained by the UE according to the first received power codebook element; and

performing precoding processing according to the CSI.

17. A UE (user equipment), comprising:

a receiving unit, configured to receive a number of bits used for quantizing a relative received power value sent by a base station, wherein the relative received power value is a difference between received power of an antenna port of a UE measurement set and a minimum received power of all antenna ports of the UE measurement set;

a determining unit, configured to determine a received power codebook according to the number of bits and the UE measurement set, wherein the received power codebook comprises multiple received power codebook elements and each received power codebook element corresponds to a received power codebook index value;

an index value selecting unit, configured to select a first received power codebook index value from multiple received power codebook index values; and

a sending unit, configured to send the first received power codebook index value to the base station, so that the base station determines a first received power codebook element corresponding to the first received power codebook index value and processes a signal according to the first received power codebook element.

18. The UE according to claim 17 , wherein the number of bits is equal to a number of antenna ports of the UE measurement set.

19. The UE according to claim 17 , wherein the first received power codebook element carries first selection information and second selection information,

wherein the first selection information indicates that the received power from the antenna port is high received power, and

wherein the second selection information indicates that the received power from the antenna port is low received power.

20. The UE according to claim 17 , wherein the selecting the first received power codebook index value from the multiple received power codebook index values comprises:

measuring radio channels according to a number of antenna ports of the UE measurement set, so as to obtain the relative received power value, wherein the radio channels are radio channels from the base station to antenna ports of the UE measurement set;

quantizing the relative received power value according to the number of bits; and

selecting the first received power codebook index value from multiple received power codebook index values according to the quantized relative received power value.

21. The UE according to claim 20 , wherein rank indication (RI), channel quality indication (CQI), or a precoding matrix index (PMI) is measured after the first received power codebook index value is selected.

22. The UE according to claim 21 , wherein a first transmission period is longer than or equal to a second transmission period,

wherein the first transmission period refers to a signal period for periodically sending the first received power codebook index value, and

the second transmission period refers to a signal period for periodically sending the RI.