METHOD AND APPARATUS FOR RECEIVING SIGNAL IN WIRELESS COMMUNICATION SYSTEM

• US 20150003407A1
• Filed: 01/11/2013
• Published: 01/01/2015
• Est. Priority Date: 01/11/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Hanbyul, Kim, Byounghoon, Ahn, Joonkui, Seo, Dongyoun
• Granted Patent: US 9,397,865 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• 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 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

One embodiment of the present invention is a method in which a terminal receives a signal in a wireless communication system, comprising: a step of receiving a subframe; and a step of performing a channel estimation using either a cell-specific reference signal (CRS) or a channel state information-reference signal (CSI-RS) depending on the information relating to a time-frequency resource to which the subframe pertains.

Claims

1. A method of receiving a signal, which is received by a user equipment in a wireless communication system, comprising the steps of:

receiving a subframe; and

performing a channel estimation using either a cell specific reference signal (CRS) or a channel state information-reference signal (CSI-RS) in accordance with an information related to a time-frequency resource having the subframe correspond thereto.

2. The method of claim 1, wherein if the channel estimation is performed using the CRS, the user equipment demodulates PDCCH (physical downlink control channel) only and wherein if the channel estimation is performed using the CSI-RS, the user equipment demodulates E-PDCCH (enhanced-physical downlink control channel) only.

3. The method of claim 1, wherein the information related to the time-frequency resource comprises a subframe set configured to estimate a channel using the CRS.

4. The method of claim 1, wherein if the channel estimation is performed using the CSI-RS, the user equipment is set not to perform an interference measurement using a CRS transmitted resource element, an RRM/RLM (radio resource management/radio link monitoring) measurement using the CRS, and a demodulation of PDSCH (physical downlink shared channel) using the CRS.

5. The method of claim 1, wherein if the channel estimation is performed using the CSI-RS, an interference measurement of the user equipment is performed using a zero power CSI-RS.

6. The method of claim 1, wherein if the subframe corresponds to a CSI reference resource, an interference measurement for reporting the CSI is performed based on a reference signal used for the channel estimation of the subframe.

7. The method of claim 6, wherein if the subframe comprises an MBSFN (multicast broadcast signal frequency network) subframe, an interference measurement for reporting the CSI is performed based on the CSI-RS.

8. The method of claim 1, wherein if the user equipment measures interferences in a plurality of subframes including the subframe, an interference measured in a subframe for performing the channel estimation using the CRS and an interference measured in a subframe for performing the channel estimation using the CSI-RS are not considered together.

9. The method of claim 8, wherein if the user equipment receives a prescribed information, both of the interference measured in the subframe for performing the channel estimation using the CRS and the interference measured in the subframe for performing the channel estimation using the CSI-RS are considered.

10. The method of claim 9, wherein if the interference measurement in the subframe for performing the channel estimation using the CSI-RS is performed using a zero power CSI-RS, the prescribed information indicates whether a transmission power of a whole serving transmitting point of the user equipment is zero in the zero power CSI-RS.

11. The method of claim 1, wherein the information related to the time-frequency resource indicates whether the subframe correspond to a virtual primary cell (Pcell) or a virtual secondary cell (Scell).

12. The method of claim 1, wherein if the subframe corresponds to a virtual Pcell, the channel estimation uses the CRS and wherein if the subframe corresponds to a virtual Scell, the channel estimation uses the CSI-RS.

13. The method of claim 1, wherein a frequency resource of the subframe corresponds to a single component carrier.

14. In a wireless communication system, a user equipment device comprising:

a receiving module; and

a processor performing a channel estimation using either a cell specific reference signal (CRS) or a channel state information-reference signal (CSI-RS) in accordance with an information related to a time-frequency resource having a received subframe correspond thereto.