Method of transmitting power information in wireless communication system

• US 8,472,539 B2
• Filed: 04/06/2010
• Issued: 06/25/2013
• Est. Priority Date: 04/07/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyunsoo, Lee, Moon Il, Chung, Jae Hoon, Ihm, Bin Chul, Kwon, Yeong Hyeon
• Primary Examiner(s): Liu, Shuwang
• Assistant Examiner(s): HUANG, DAVID S
• Application Number:
  US12/754,755
• Publication Number:
  US 20100254471A1
• Time in Patent Office: 1,176 Days
• Field of Search: 375/260, 375/295
• US Class Current: 375/260
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path

Abstract

A method of transmitting power information in a wireless communication system is provided. The method includes: determining energy per resource element (RE) to which a reference signal or data is mapped for downlink transmission; and transmitting power information of the reference signal and the data, wherein the reference signal comprises a channel state indication-reference signal (CSI-RS) for channel state measurement, power information of the CSI-RS is denoted by a ratio of power for a CSI-RS RE and power for a data RE of an orthogonal frequency division multiplexing (OFDM) symbol on which only data is transmitted or power for a cell-specific RS (CRS) RE used for channel state measurement and data demodulation of different OFDM symbols.

Claims

1. A method of transmitting power information in a wireless communication system, the method comprising:

determining energy per resource element (RE) to which a reference signal or data is mapped for downlink transmission; and

transmitting power information of the reference signal and the data,

wherein the reference signal comprises a channel state indication-reference signal (CSI-RS) for channel state measurement,

power information of the CSI-RS is denoted by

P_Data-NRS/P_CSI-RS or P_CSI-RS/P_CRS, and

the power information of the data included in an orthogonal frequency division multiplexing (OFDM) symbol including the CSI-RS is denoted by

P_DATA-NRS/P_CRS,

wherein P_DATA-NRS is a power for a data resource element (data RE) for an OFDM symbol on which only data is transmitted, P_CSI-RS is a power for a CSI-RS resource element (CSI-RS RE), and P_CRS is a power for a cell-specific reference signal resource element (CRS RE) used for channel state measurement and data demodulation.

2. The method of claim 1, wherein the ratio of the power for the CSI-RS RE and the power for the data RE is determined to be equal to the ratio of the power for the CRS RE and the power for the data RE for the OFDM symbol on which only the data is transmitted.

3. The method of claim 1, wherein the power information of the CSI-RS is indicated by a predetermined integer value.

4. The method of claim 1, wherein the power information of the CSI-RS is transmitted by higher-layer signaling.

5. The method of claim 1, wherein the CSI-RS is transmitted by being shifted to a position determined in a frequency domain.

6. The method of claim 1, wherein the CSI-RS is transmitted with a subframe offset different for each cell.

7. The method of claim 1, wherein the power information of the data included in an OFDM symbol including the CSI-RS is indicated by a parameter indicating the ratio of the power for the CSI-RS RE and the power for the data RE of the OFDM symbol on which only the data is transmitted and the ratio of the power for the CRS RE and the power for the data RE for the OFDM symbol on which only the data is transmitted.

8. The method of claim 1, wherein the power information of the data included in the OFDM symbol including the CSI-RS is transmitted by higher-layer signaling.

9. A method of transmitting power information in a wireless communication system, the method comprising:

determining energy per resource element (RE) to which a reference signal or data is mapped for downlink transmission; and

transmitting power information of the reference signal and the data,

wherein the reference signal comprises a channel state indication-reference signal (CSI-RS) for channel state measurement,

power information of the CSI-RS is denoted by

P_Data-NRS/P_CSI-RS or P_CSR-RS/P_CRS, and

the power information of the data included in an orthogonal frequency division multiplexing (OFDM) symbol including the CSI-RS is denoted by

P_DATA-RS/P_CRS,

wherein P_DATA-NRS is a power for a data resource element (data RE) for an OFDM symbol on which only data is transmitted, P_DATA-RS is a power for a data RE included in an OFDM symbol including a cell-specific specific reference signal (CRS), P_CSI-RS is a power for a CSI-RS resource element (CSI-RS RE), and P_CRS is a power for a cell-specific reference signal resource element (CRS RE) used for channel state measurement and data demodulation.