Method for reporting channel state information, method for supporting same, and apparatus for said methods

• US 9,768,930 B2
• Filed: 02/08/2013
• Issued: 09/19/2017
• Est. Priority Date: 02/11/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Jonghyun, Sohn, Illsoo, Kim, Kijun, Seo, Hanbyul
• Primary Examiner(s): Anwar, Mohammad
• Assistant Examiner(s): Detse, Kokou R
• Application Number:
  US14/373,082
• Publication Number:
  US 20150029966A1
• Time in Patent Office: 1,684 Days
• Field of Search: 370329
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/0014 Three-dimensional division time-code-space division H04B7/0413, H04B7/0697
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated

Abstract

According to one embodiment of the present invention, the method for receiving a channel state information (CSI)-reference signal (RS) from a wireless communication system by a user device comprises the steps of: receiving resource configuration information on the CSI-RS; and receiving the CSI-RS on the basis of the resource configuration information on the CIS-RS, wherein the resource configuration information on the CSI-RS includes information on a cell specific-RS (CRS) related to the CSI-RS, and the user device can assume that an antenna port related to information on the CRS and an antenna port used for transmitting CSI-RS corresponding to the resource configuration information on the CSI-RS are quasi co-located.

Claims

1. A method for receiving, by a mobile terminal, a channel state information (CSI)-reference signal (RS) in a wireless communication system, the method comprising:

receiving CSI-RS resource configuration information through higher layer signaling and receiving the CSI-RS according to the CSI-RS resource configuration information;

deriving CSI based on the CSI-RS; and

reporting the derived CSI to a base station,

wherein the CSI-RS resource configuration information includes information on one or more cell specific-RS (CRS) antenna ports assumed to be quasi-co-located with one or more antenna ports used to transmit the CSI-RS.

2. The method according to claim 1, wherein the information on the one or more CRS antenna ports is used to acquire a large-scale property of a radio channel from the one or more antenna ports used to transmit the CSI-RS.

3. The method according to claim 2, wherein the large-scale property of the radio channel from the one or more antenna ports used to transmit the CSI-RS is derived from a radio channel from an antenna port used to transmit the CRS.

4. The method according to claim 2, wherein the large-scale property of the radio channel includes at least one of delay spread, Doppler spread, Doppler shift, average gain and average delay.

5. The method according to claim 1, wherein the information on the one or more CRS antenna ports includes identification information about the CRS.

6. The method according to claim 1, wherein the mobile terminal is configured in transmission mode 10.

7. The method according to claim 1, wherein the CSI-RS resource configuration information further includes information on one or more antenna ports used to transmit a demodulation reference signal (DMRS) assumed to be quasi-co-located with the antenna ports used to transmit the CSI-RS with respect to large-scale properties of radio channels.

8. The method according to claim 1, wherein the CSI-RS and the CRS are transmitted from different cells.

9. A method for transmitting, by a base station, a channel state information (CSI)-reference signal (RS) in a wireless communication system, the method comprising:

transmitting CSI-RS resource configuration information through higher layer signaling to a mobile terminal and transmitting the CSI-RS according to the CSI-RS resource configuration information; and

receiving, from the mobile terminal, CSI derived based on the CSI-RS,

wherein the CSI-RS resource configuration information includes information on one or more cell specific-RS (CRS) antenna ports used to transmit the CSI-RS.

10. A mobile terminal configured to receive a channel state information (CSI)-reference signal (RS) in a wireless communication system, the mobile terminal comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is further configured to;

receive CSI-RS resource configuration information through higher layer signaling and receive the CSI-RS according to the CSI-RS resource configuration information,

derive CSI based on the CSI-RS, and

report the derived CSI to a base station, and

wherein the CSI-RS resource configuration information includes information on one or more cell specific-RS (CRS) antenna ports assumed to be quasi-co-located with one or more antenna ports used to transmit the CSI-RS.

11. The mobile terminal according to claim 10, wherein the information on the one or more CRS antenna ports is used to acquire a large-scale property of a radio channel from the one or more antenna ports used to transmit the CSI-RS.

12. The mobile terminal according to claim 11, wherein the large-scale property of the radio channel from the one or more antenna ports used to transmit the CSI-RS is derived from a radio channel from an antenna port used to transmit the CRS.

13. The mobile terminal according to claim 11, wherein the large-scale property of the radio channel includes at least one of delay spread, Doppler spread, Doppler shift, average gain and average delay.

14. The mobile terminal according to claim 10, wherein the information on the one or more CRS antenna ports includes identification information about the CRS.

15. The mobile terminal according to claim 10, wherein the mobile terminal is configured in transmission mode 10.

16. The mobile terminal according to claim 10, wherein the CSI-RS resource configuration information further includes information on one or more antenna ports used to transmit a demodulation reference signal (DMRS) assumed to be quasi-co-located with the antenna ports used to transmit the CSI-RS with respect to large-scale properties of radio channels.

17. The mobile terminal according to claim 10, wherein the CSI-RS and the CRS are transmitted from different cells.

18. A base station configured to transmit a channel state information (CSI)-reference signal (RS) in a wireless communication system, the base station comprising:

a radio frequency (RF) unit; and

a processor configured to control the RE unit,

wherein the processor is further configured to;

transmit CSI-RS resource configuration information through higher layer signaling to a mobile terminal and transmit the CSI-RS according to the CSI-RS resource configuration information, and

receive, from the mobile terminal, CSI derived based on the CSI-RS, and

wherein the CSI-RS resource configuration information includes information on one or more cell specific-RS (CRS) antenna ports assumed to be quasi-co-located with one or more antenna ports used to transmit the CSI-RS.