Method for receiving or transmitting downlink signals and apparatus therefor

• US 9,331,831 B2
• Filed: 03/15/2013
• Issued: 05/03/2016
• Est. Priority Date: 03/15/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Jihyun, Kim, Hakseong, Seo, Hanbyul
• Primary Examiner(s): Marcelo, Melvin
• Assistant Examiner(s): SOLINSKY, PETER G
• Application Number:
  US14/383,052
• Publication Number:
  US 20150036652A1
• Time in Patent Office: 1,145 Days
• Field of Search: 370/330
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI

Abstract

Disclosed is a method for receiving downlink signals in a wireless communication system, the method comprising: receiving downlink signal from a base station and detecting the downlink signal, wherein the detecting the downlink signal includes, if the number of resource elements (REs) to which channel state information-reference signal (CSI-RS) in a downlink subframe is mapped is smaller than the number of the enhanced control channel elements (eCCEs) for an enhanced physical downlink control channel (EPDCCH) in the downlink subframe, assuming REs, the number of which corresponds to a difference value between the number of eCCEs and the number of REs, which are included in the EPDCCH, as a zero-power CSI-RS, wherein the REs assumed as the zero-power CSI-RS is included in an eCCE that does not comprise the REs to which the CSI-RS is mapped.

Claims

1. A method for receiving downlink signals in a wireless communication system, the method comprising:

receiving downlink signal from a base station and detecting the downlink signal,

wherein the detecting the downlink signal includes, if the number of resource elements (REs) to which channel state information-reference signal (CSI-RS) in a downlink subframe is mapped is smaller than the number of the enhanced control channel elements (eCCEs) for an enhanced physical downlink control channel (EPDCCH) in the downlink subframe, assuming REs, the number of which corresponds to a difference value between the number of eCCEs and the number of REs, which are included in the EPDCCH, as a zero-power CSI-RS, and

wherein the REs assumed as the zero-power CSI-RS is included in an eCCE that does not comprise the REs to which the CSI-RS is mapped.

2. The method according to claim 1, wherein the REs to which the CSI-RS is mapped and the REs assumed as the zero-power CSI-RS are equally allocated to all eCCEs.

3. The method according to claim 1, wherein the REs assumed as the zero-power CSI-RS is mapped to a location obtained by cyclic shifting a location of the REs to which the CSI-RS is mapped by as much as a predetermined distance in a time-frequency direction.

4. The method according to claim 1, wherein the REs assumed as the zero-power CSI-RS is mapped to remaining REs obtained by excluding the REs to which the CSI-RS is mapped, from REs for a specific CSI-RS configuration comprising the REs to which the CSI-RS is mapped.

5. The method according to claim 1, wherein information about a location of the REs assumed as the zero-power CSI-RS is received via higher layer signaling.

6. A method for transmitting downlink signals in a wireless communication system, the method comprising:

transmitting downlink signal to a user equipment (UE),

wherein the transmitting the downlink signal includes;

if the number of resource elements (REs) to which channel state information-reference signal (CSI-RS) in a downlink subframe is mapped is smaller than the number of the enhanced control channel elements (eCCEs) for an enhanced physical downlink control channel (EPDCCH) in the downlink subframe, configuring REs, the number of which corresponds to a difference value between the number of eCCEs and the number of REs included in the EPDCCH, as a zero-power CSI-RS, and

wherein the REs configured as the zero-power CSI-RS are included in an eCCE that does not comprise the REs to which the CSI-RS is mapped.

7. A user equipment (UE) configured to receive downlink signals in a wireless communication system, the UE comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to receive downlink signal from a base station and detects the downlink signal, and

the processor is configured to;

if the number of resource elements (REs) to which channel state information-reference signal (CSI-RS) in a downlink subframe is mapped is smaller than the number of the enhanced control channel elements (eCCEs) for an enhanced physical downlink control channel (EPDCCH) in the downlink subframe, assume REs, the number of which corresponds to a difference value between the number of eCCEs and the number of REs, which are included in the EPDCCH, as a zero-power CSI-RS; and

wherein the REs assumed as the zero-power CSI-RS is included in an eCCE that does not comprise the REs to which the CSI-RS is mapped.

8. The UE according to claim 7, wherein the REs assumed as the zero-power CSI-RS is equally allocated to all eCCEs.

9. The UE according to claim 7, wherein the REs assumed as the zero-power CSI-RS is mapped to a location obtained by cyclic shifting a location of the REs to which the CSI-RS is mapped by as much as a predetermined distance in a time-frequency direction.

10. The UE according to claim 7, wherein the REs assumed as the zero-power CSI-RS is mapped to remaining REs obtained by excluding the REs to which the CSI-RS is mapped, from REs for a specific CSI-RS configuration comprising the REs to which the CSI-RS is mapped.

11. The UE according to claim 7, wherein information about a location of the REs assumed as the zero-power CSI-RS is received via higher layer signaling.

12. A base station configured to transmit downlink signals in a wireless communication system, the base station comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to transmit downlink signal to a user equipment (UE), and

the processor is configured to;

if the number of resource elements (REs) to which channel state information-reference signal (CSI-RS) in a downlink subframe is mapped is smaller than the number of the enhanced control channel elements (eCCEs) for an enhanced physical downlink control channel (EPDCCH) in the downlink subframe, configure REs, the number of which corresponds to a difference value between the number of eCCEs and the number of REs included in the EPDCCH as a zero-power CSI-RS; and

wherein the REs configured as the zero-power CSI-RS is included in an eCCE that does not comprise the REs to which the CSI-RS is mapped.