METHOD AND APPARATUS FOR REPORTING CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM

• US 20130083758A1
• Filed: 10/04/2012
• Published: 04/04/2013
• Est. Priority Date: 10/04/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Kim, Youn-Sun, Lee, Hyo-Jin, Lee, Ju-Ho, KIM, Ki-IL
• Granted Patent: US 8,891,472 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• 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: H04B 7/065 Variable contents, e.g. long-term or short-short
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 25/00 Baseband systems
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

A method and apparatus are provided for reporting Channel State Information (CSI) for operation of a network, when a Precoding Matrix Indicator (PMI) and a Channel Quality Indicator (CQI) cannot be calculated. The method includes reporting a first Precoding Matrix Indicator (PMI); detecting that a Rank Indicator (RI) is changed before a second PMI is reported, the RI being changed within an RI group; calculating the second PMI and a Channel Quality Indicator (CQI) using the first PMI; and reporting the second PMI and the CQI.

Claims

1. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:

reporting a first Precoding Matrix Indicator (PMI);

detecting that a Rank Indicator (RI) is changed before a second PMI is reported, the RI being changed within an RI group;

calculating the second PMI and a Channel Quality Indicator (CQI) using the first PMI; and

reporting the second PMI and the CQI.

2. The method of claim 1, wherein the first PMI indicates a wideband and long term channel condition, and the second PMI indicates a precoding matrix indicator in the wideband channel and long-term channel condition according to a Precoding Type Indicator (PTI) value and an instance at which the CSI is reported, or a precoding matrix indicator in the subband and short-term channel condition.

3. The method of claim 1, wherein the RI group includes a plurality of groups divided according to ranks.

4. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:

reporting a first Precoding Matrix Indicator (PMI);

detecting that a Rank Indicator (RI) is changed before a second PMI is reported;

calculating the second PMI and a Channel Quality Indicator (CQI) based on a previous RI, which is reported before the RI is changed; and

reporting the second PMI and the CQI.

5. The method of claim 4, wherein the first PMI indicates a wideband and long term channel condition, and the second PMI indicates a precoding matrix indicator in the wideband channel and long-term channel condition according to a Precoding Type Indicator (PTI) value and an instance at which the CSI is reported, or a precoding matrix indicator in the subband and short-term channel condition.

6. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:

reporting a first Precoding Matrix Indicator (PMI);

detecting that a Rank Indicator (RI) is changed before a second PMI is reported;

calculating the second PMI and a Channel Quality Indicator (CQI) using a first PMI which is predefined among a candidate first PMI set of a previous RI, which was reported before the RI is changed; and

reporting the second PMI and the CQI.

7. The method of claim 6, wherein the first PMI indicates a wideband and long term channel condition, and the second PMI indicates a precoding matrix indicator in the wideband channel and long-term channel condition according to a Precoding Type Indicator (PTI) value and an instance at which the CSI is reported, or a precoding matrix indicator in the subband and short-term channel condition.

8. A method for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the method comprising:

reporting a first Precoding Matrix Indicator (PMI);

detecting that a Rank Indicator (RI) is changed before a second PMI is reported; and

not reporting the second PMI before the first PMI based on the changed RI is reported.

9. The method of claim 8, wherein the first PMI indicates a wideband and long term channel condition, and the second PMI indicates a precoding matrix indicator in the wideband channel and long-term channel condition according to a Precoding Type Indicator (PTI) value and an instance at which the CSI is reported, or a precoding matrix indicator in the subband and short-term channel condition.

10. A User Equipment (UE) for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the UE comprising:

a transmitter for transmitting to an evolved Node B (eNB) the CSI including at least one of a first Precoding Matrix Indicator (PMI), and second PMI and Channel Quality Indicator (CQI); and

a controller for reporting to the eNB, the second PMI and CQI, which are calculated using the first PMI, if the RI is changed before the second PMI is reported, after the first PMI is reported,

wherein the RI is changed within an RI group.

11. The UE of claim 10, wherein the first PMI indicates a wideband and long term channel condition, and the second PMI indicates a precoding matrix indicator in the wideband channel and long-term channel condition according to a Precoding Type Indicator (PTI) value and an instance at which the CSI is reported, or a precoding matrix indicator in the subband and short-term channel condition.

12. The UE of claim 10, wherein the RI group comprises a plurality of groups divided according to ranks.

13. A User Equipment (UE) for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the UE comprising:

a transmitter for transmitting to an evolved Node B (eNB) the CSI including at least one of a first Precoding Matrix Indicator (PMI), and a second PMI and a Channel Quality Indicator (CQI); and

a controller for reporting to the eNB, the second PMI and the CQI, which are calculated based on a previous Rank Indicator (RI), which is reported before an RI changes, if the RI is changed before the second PMI is reported, after the first PMI is reported.

14. The UE of claim 13, wherein the first PMI indicates a wideband and long term channel condition, and the second PMI indicates a precoding matrix indicator in the wideband channel and long-term channel condition according to a Precoding Type Indicator (PTI) value and an instance at which the CSI is reported, or a precoding matrix indicator in the subband and short-term channel condition.

16. The UE of claim 13, wherein the first PMI indicates a wideband and long term channel condition, and the second PMI indicates a precoding matrix indicator in the wideband channel and long-term channel condition according to a Precoding Type Indicator (PTI) value and an instance at which the CSI is reported, or a precoding matrix indicator in the subband and short-term channel condition.

15. A User Equipment (UE) for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the UE comprising:

a transmitter for transmitting to an evolved Node B (eNB) the CSI including at least one of a first Precoding Matrix Indicator (PMI), and a second PMI and a Channel Quality Indicator (CQI); and

a controller for reporting to the eNB, the second PMI and the CQI, which are calculated using a first PMI, which is cyclically predefined among a candidate first PMI set of a previous Rank Indicator (RI), which is reported before the RI changes, if the RI changes before the second PMI is reported, after the first PMI is reported.

17. A User Equipment (UE) for reporting Channel State Information (CSI) in an uplink in a wireless communication system, the UE comprising:

a transmitter for transmitting to an evolved Node B (eNB) the CSI including at least one of a first Precoding Matrix Indicator (PMI), and a second PMI and a Channel Quality Indicator (CQI); and

a controller for not reporting the second PMI before the first PMI based on a changed RI is reported, if the RI is changed before the second PMI is reported, after the first PMI is reported.

18. The UE of claim 17, wherein the first PMI indicates a wideband and long term channel condition, and the second PMI indicates a precoding matrix indicator in the wideband channel and long-term channel condition according to a Precoding Type Indicator (PTI) value and an instance at which the CSI is reported, or a precoding matrix indicator in the subband and short-term channel condition.