METHOD, DEVICE, AND SYSTEM FOR SENDING CHANNEL STATE INFORMATION

• US 20140086353A1
• Filed: 12/02/2013
• Published: 03/27/2014
• Est. Priority Date: 06/03/2011
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: NI, Jun, XIA, Liang, WANG, Yi, ZHANG, Jiayin
• Granted Patent: US 9,106,290 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0482 Adaptive codebooks
• CPC Class Codes: H04B 7/061 using feedback from receiving side
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

Embodiments of the present invention provide a method, device, and system for sending channel state information. The method for sending channel state information includes: setting number of bits used for quantizing a relative received power value; sending the number of bits to a user equipment UE; receiving a received power codebook index value; determining a received power codebook element corresponding to the received power codebook index value; and processing a signal according to the corresponding received power codebook element.

Claims

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

setting 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;

sending the number of bits to the UE, so that the UE and a base station 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;

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

determining a first received power codebook element corresponding to the first received power codebook index value; and

processing 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 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.

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

estimating a downlink channel according to the first received power codebook element, so as to perform precoding processing.

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

receiving a number of bits used for quantizing a relative received power value, so that a UE (user equipment) and a base station determine a received power codebook according to the number of bits and a UE measurement set, wherein the received power codebook comprises multiple received power codebook elements, each received power codebook element corresponds to a received power codebook index value, and the relative received power value is a difference between a received power of an antenna port of the UE measurement set and a minimum received power of all antenna ports of the UE;

selecting a first received power codebook index value from multiple received power codebook index values; and

sending the first received power codebook index value to the base station.

7. The method according to claim 6, wherein the number of bits used for quantizing the relative received power value 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 index value corresponds to a first received power codebook element, 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 the first received power codebook index value from the multiple received power codebook index values comprises:

measuring 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 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.

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

measuring 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 device for sending channel state information, 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;

a first sending unit, configured to send the number of bits to the UE, so that the UE and a base station 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 receiving unit, configured to receive a first received power codebook index value, wherein the first received power codebook index value is selected from multiple received power codebook index values by the UE;

a determining unit, 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 device according to claim 12, wherein the number of bits is equal to a number of antenna ports of the UE measurement set.

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

estimating a downlink channel according to the first received power codebook element, so as to perform precoding processing.

17. A device for sending channel state information, comprising:

a receiving unit, configured to receive a number of bits used for quantizing a relative received power value, so that a UE (user equipment) and a base station determine a received power codebook according to the number of bits and a UE measurement set, wherein the received power codebook comprises multiple received power codebook elements, each received power codebook element corresponds to a received power codebook index value, and the relative received power value is a difference between a received power of an antenna port of the UE measurement set and a minimum received power of all antenna ports of the UE;

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.

18. The device according to claim 17, wherein the number of bits used for quantizing the relative received power value is equal to a number of antenna ports of the UE measurement set.

19. The device according to claim 17, wherein the first received power codebook index value corresponds to a first received power codebook element, 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 device 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 device 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 device 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.