Method and device for reporting channel quality information

Patent metadata

Field	Value
Publication number	US-9936410-B2
Application number	US-201114002106-A
Country	US
Kind code	B2
Filing date	Oct 13, 2011
Priority date	Nov 5, 2010
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A method and a device for reporting channel quality information are provided by the present invention, the method comprising that: measuring, by a user equipment (UE), Channel State Information-Reference Signal (CSI-RS) according to the configuration information of the CSI-RS, to acquire a downlink channel transport matrix ( 101 ); determining, by the UE, Channel Quality Indicator (CQI) of a frequency domain reporting unit according to the number of CSI-RS ports and the corresponding transmission scheme of the Physical Downlink Shared Channel (PDSCH) used when determining the CQI, and the downlink channel transport matrix acquired by measurement ( 102 ); reporting, by the UE, the determined CQI to network side ( 103 ). The present invention can realize measurement and reporting of CSI-RS-based channel quality information on the basis of non-Precoding Matrix Indicator (PMI) feedback transmissions.

First claim

The invention claimed is:

1. A method for reporting channel quality information, the method using non-Precoding Matrix Indicator (non-PMI) feedback for a transmission mode, the method comprising:
measuring, by a User Equipment (UE), a Channel State Information-Reference Signal (CSI-RS) according to configuration information of the CSI-RS, to acquire a downlink channel transport matrix;
determining, by the UE, a Channel Quality Indicator (CQI) of a frequency domain reporting unit, according to a number of CSI-RS ports and the corresponding transmission scheme of a Physical Downlink Shared Channel (PDSCH) used when determining the CQI, and the downlink channel transport matrix being acquired by a measurement; and
reporting, by the UE, the determined CQI to a network side,
wherein the transmission scheme of the PDSCH comprises: the PDSCH is assumed to be transmitted through a single-port when the number of CSI-RS ports is 1,
wherein the PDSCH being assumed to be transmitted through a Cell-specific Reference Signal (CRS) port by a transmit diversity scheme when the number of CSI-RS ports is larger than 1 comprises:
the PDSCH is assumed to be transmitted through the CRS port by the transmit diversity scheme when the number of CSI-RS ports is larger than 1;
the PDSCH is assumed to be transmitted through 2 CRS ports by a two-port transmit diversity scheme, if the number of CSI-RS ports is 2;
the PDSCH is assumed to be transmitted through 4 CRS ports by a 4-port transmit diversity scheme, if the number of CSI-RS ports is 4;
the PDSCH is assumed to be transmitted through 2 CRS ports by a two-port transmit diversity scheme, or the PDSCH is assumed to be transmitted through 4 CRS ports by a four-port transmit diversity scheme, if the number of CSI-RS ports is 8; and
further assuming, by the UE, the channel matrix acquired by measurement of 2 CRS ports is HW, if the UE assumes that the PDSCH uses 2 CRS ports, where H represents the downlink channel transport matrix acquired by measurement of CSI-RS, and W represents an 8×2 dimension matrix.

2. The method of claim 1 , wherein the transmission scheme of the PDSCH also comprises: further assuming, by the UE, the channel matrix acquired by measurement of 4 CRS ports is HW, if the UE assumes that the PDSCH uses 4 CRS ports, where H represents the downlink channel transport matrix acquired by measurement of CSI-RS, and W represents an 8×4 dimension matrix.

3. The method of claim 2 wherein, the number of CRS ports and matrix W used when determining the CQI are predetermined before reporting by the UE, and are known to the UE and the network side.

4. The method of claim 1 , wherein the mode for reporting the CQI by the UE is one of the following:
Physical Uplink Control Channel PUCCH reporting mode 1 - 0 ;
PUCCH reporting mode 2 - 0 ; and
Physical Shared Control Channel PUSCH reporting mode 2 - 0 ; PUSCH reporting mode 3 - 0 .

5. The method of claim 1 , wherein the UE acquires the configuration information of the CSI-RS by broadcast mode.

6. The method of claim 1 , wherein the assumed number of CRS ports and matrix W used when determining the CQI are predetermined before reporting by the UE, and are known to the UE and the network side.

7. A User Equipment (UE) using non-Precoding Matrix Indicator (non-PMI) for a transmission mode, the UE comprising:
a processor configured as:
a measurement module, the measurement module being configured to measure CSI-RS according to the configuration information of the CSI-RS and acquire a downlink channel transport matrix;
a determination module, the determination module being configured to determine the CQI of a frequency domain reporting unit according to the number of CSI-RS ports and the corresponding transmission scheme of the PDSCH used when determining the CQI, and the downlink channel transport matrix acquired by measurement module; and
a reporting module, the reporting module being configured to report the CQI determined by the determination module to the network side; and

a memory device, the memory device being configured to save the transmission scheme of the PDSCH,
wherein the transmission scheme of the PDSCH includes: the PDSCH is assumed to be transmitted through a single-port when the number of CSI-RS ports is 1,
wherein the PDSCH is assumed to be transmitted through a CRS port by a transmit diversity scheme when the number of CSI-RS ports is larger than 1,
wherein, for the information of the transmission scheme of the PDSCH saved by the memory device, the PDSCH is assumed to be transmitted through the CRS port by the transmit diversity scheme when the number of CSI-RS ports is larger than 1, which specifically includes:
the PDSCH is assumed to be transmitted through 2 CRS ports by a two-port transmit diversity scheme, if the number of CSI-RS ports is 2;
the PDSCH is assumed to be transmitted through 4 CRS ports by a 4-port transmit diversity scheme, if the number of CSI-RS ports is 4 ; and
the PDSCH is assumed to be transmitted through 2 CRS ports by a two-port transmit diversity scheme, or the PDSCH is assumed to be transmitted through 4 CRS ports by a four-port transmit diversity scheme, if the number of CSI-RS ports is 8,

wherein, for the transmission scheme information of the PDSCH saved by the memory device, the transmission scheme of the PDSCH also includes:
further assuming, by the UE, the channel matrix acquired by measurement of 2 CRS ports is HW, if the UE assumes that the PDSCH uses 2 CRS ports, where H represents a downlink channel transport matrix acquired by measurement of CSI-RS, and W represents an 8×2 dimension matrix.

8. The UE of claim 7 , wherein, for the transmission scheme information of the PDSCH saved by the memory module, the transmission scheme of the PDSCH also includes: further assuming, by the UE, the channel matrix acquired by measurement of 4 CRS ports is HW, if the UE assumes that PDSCH uses 4 CRS ports, where H represents a downlink channel transport matrix acquired by measurement of CSI-RS, and W represents an 8×4 dimension matrix.

9. The UE of claim 8 , wherein the assumed number of CRS ports and matrix W used when the determination module is determining the CQI are predetermined before reporting by the UE, and are known to the UE and the network side.

10. The UE of claim 7 , wherein, the mode of reporting the CQI by the reporting module is one of the following:
PUCCH reporting mode 1 - 0 ;
PUCCH reporting mode 2 - 0 ;
PUSCH reporting mode 2 - 0 ; and
PUSCH reporting mode 3 - 0 .

11. The UE of claim 7 , wherein the processor is further configured as: an acquiring module configured to acquire the configuration information of the CSI-RS by broadcast mode.

12. The UE of claim 7 , wherein the assumed number of CRS ports and matrix W used when the determination module is determining the CQI are predetermined before reporting by the UE, and are known to the UE and the network side.

Assignees

• Su Xin
• Gao Qiubin
• Tamrakar Rakesh
• Shen Zukang
• Sun Shaohui
• Datang mobile communications equipment co ltd

Inventors

• Su Xin
• Gao Qiubin
• Tamrakar Rakesh
• Shen Zukang
• Sun Shaohui

Classifications

• H04W24/10 Primary

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04B7/0632

  Channel quality parameters, e.g. channel quality indicator [CQI] · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04L1/0026

  Transmission of channel quality indication · CPC title

• H04L1/20

  using signal quality detector · CPC title