METHOD AND DEVICE FOR SETTING CHANNEL STATUS INFORMATION MEASURING RESOURCE IN A WIRELESS COMMUNICATION SYSTEM

• US 20130301465A1
• Filed: 01/12/2012
• Published: 11/14/2013
• Est. Priority Date: 01/14/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Hanbyul, Kim, Kijun, Kim, Byounghoon
• Granted Patent: US 9,264,915 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 25/0202 Channel estimation
• 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: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

The present invention relates to a wireless communication system, and more specifically, discloses a method and a device for setting a channel status information (CSI) measuring resource in a wireless communication system. The present invention provides a way to transmit/receive the CSI more accurately and efficiently by setting a virtual reference resource for measuring the CSI.

Claims

1. A method for transmitting channel status information (CSI) by a User Equipment (UE) in a wireless communication system, comprising:

determining signal characteristics and interference characteristics in a reference resource for calculation of the CSI; and

determining the CSI using the determined signal characteristics and interference characteristics and transmitting the CSI in a subframe n to an eNodeB (eNB),

wherein the reference resource is present in a subframe n−

k (k≧

4), the signal characteristics are determined from a signal measurement result through the reference resource or a previously received reference signal, and the interference characteristics are determined from a result of interference measurement in the reference resource or a previously set interference measurement resource.

2. The method according to claim 1, wherein the subframe n−

k to which the reference resource is set includes a valid downlink subframe or an invalid downlink subframe,

wherein the valid downlink subframe is set for the UE, is not multicast/broadcast over a single frequency network (MBSFN) subframe in transmission modes other than a transmission mode for downlink transmission of a maximum of 8 layers, does not include a downlink pilot time slot (DwPTS) field less than a predetermined length and does not belong to a measurement gap set for the UE.

3. The method according to claim 1, wherein the reference signal upon which signal measurement is performed corresponds to a CSI-RS in the case of downlink transmission of up to 8 layers and corresponds to a cell-specific RS in other cases.

4. The method according to claim 1, wherein, when the CSI is periodically transmitted, the interference measurement resource is set by a higher layer signal.

5. The method according to claim 1, wherein, when the CSI is aperiodically transmitted, the interference measurement resource is set by a predetermined indicator, the predetermined indicator being included in downlink control information including an indicator requesting transmission of the CSI.

6. The method according to claim 1, wherein, when an interference measurement resource subframe set is configured for the UE and the CSI is aperiodically transmitted, the interference measurement resource is included in a subframe belonging to the interference measurement resource subframe set configured for the UE and having a value k corresponding to a minimum value, from among a subframe in which the indicator requesting transmission of the CSI is transmitted and previous subframes.

7. The method according to claim 1, wherein, when the CSI is aperiodically transmitted, the subframe in which the indicator requesting transmission of the CSI is transmitted corresponds to a subframe set to the interference measurement resource.

8. The method according to claim 1, wherein the reference measurement resource is set to one or more resource elements (REs) having zero transmit power.

9. The method according to claim 1, wherein the interference measurement resource is set to CSI-RS REs.

10. The method according to claim 1, wherein plural interference measurement resource sets are configured in a subframe for the UE,

wherein a subframe set in which the interference measurement resource is present and a subframe set to which interference characteristics represented by the interference measurement resource are applied are separately set for each of the plural interference measurement resource sets.

11. The method according to claim 1, wherein the signal characteristics correspond to the signal measurement result through the reference signal or is determined as a value estimated from the signal measurement result, and the interference characteristics correspond to the result of interference measurement in the interference measurement resource or is determined as a value estimated from the interference measurement result.

12. The method according to claim 1, wherein the result of interference measurement in the interference measurement resource represents interference characteristics in a subframe corresponding to the reference resource.

13. A method for receiving CSI at an eNB in a wireless communication system, comprising:

transmitting a reference signal to a UE; and

receiving the CSI from the UE in a subframe n,

wherein the CSI is determined based on signal characteristics and interference characteristics in a reference resource present in a subframe n−

k (k≧

4), the signal characteristics being determined from a signal measurement result through the reference resource or a previously received reference signal, the interference characteristics being determined from a result of interference measurement in the reference resource or a previously set interference measurement resource.

14. A UE configured to transmit CSI in a wireless communication system, comprising:

a reception module for receiving a downlink signal from an eNB;

a transmission module for transmitting an uplink signal to the eNB; and

a processor for controlling the UE including the reception module and the transmission module,

wherein the processor is configured to determine signal characteristics and interference characteristics in a reference resource for calculation of the CSI, to determine the CSI using the determined signal characteristics and interference characteristics and to transmit the CSI to the eNB in a subframe n via the transmission module,

wherein the reference resource is present in a subframe n−

k (k≧

4), the signal characteristics are determined from a signal measurement result through the reference resource or a previously received reference signal, and the interference characteristics are determined from a result of interference measurement in the reference resource or a previously set interference measurement resource.

15. An eNB configured to receive CSI in a wireless communication system, comprising:

a reception module for receiving an uplink signal from a UE;

a transmission module for transmitting a downlink signal to the UE; and

a processor for controlling the eNB including the reception module and the transmission module,

wherein the processor is configured to transmit a reference signal to the UE through the transmission module and to receive the CSI from the UE in a subframe n through the reception module,

wherein the CSI is determined based on signal characteristics and interference characteristics in a reference resource present in a subframe n−

k (k≧

4), the signal characteristics being determined from a signal measurement result through the reference resource or a previously received reference signal, the interference characteristics being determined from a result of interference measurement in the reference resource or a previously set interference measurement resource.