Method in which a terminal transceives a signal in a wireless communication system and apparatus for same

• US 9,509,417 B2
• Filed: 10/15/2012
• Issued: 11/29/2016
• Est. Priority Date: 10/13/2011
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Seungmin, Seo, Hanbyul
• Primary Examiner(s): Rutkowski, Jeffrey M
• Assistant Examiner(s): WOOD, JONATHAN
• Application Number:
  US14/346,685
• Publication Number:
  US 20140233518A1
• Time in Patent Office: 1,506 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• 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: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

The present application relates to a method in which a terminal receives a signal in a wireless communication system. More particularly, the method comprises: a step of receiving, from a serving cell, interference mitigation information for mitigating interference from a neighboring cell; and a step of applying an interference mitigation technique based on the interference mitigation information so as to receive a signal from the serving cell. It is assumed that the serving cell does not apply said interference mitigation technique from after the reception of the interference mitigation information to the application of the interference mitigation technique.

Claims

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

receiving, from a serving cell, interference mitigation information to mitigate interference from a neighboring cell,

wherein the interference mitigation information includes MBSFN (Multimedia Broadcast Multicast Service Single Frequency Network) subframe configuration information; and

receiving a downlink signal from the serving cell by applying an interference mitigating scheme based on the interference mitigation information,

wherein the downlink signal is received without applying the interference mitigating scheme when the downlink signal is received at a MBSFN subframe indicated by the MBSFN subframe configuration information,

wherein the interference mitigating scheme is applied when the downlink signal is received at a non-MBSFN subframe indicated by the MBSFN subframe configuration information, and

wherein the applying the interference mitigating scheme includes;

receiving, from the serving cell, interfering cell CRS pattern information indicating CRS pattern of the neighboring cell to which a specific interference mitigation scheme is always applied; and

applying the specific interference mitigation scheme indicated by the interfering cell CRS pattern information to the downlink signal,

wherein the specific interference mitigation scheme is one of a transmitting rate-matching method, a receiving side puncturing method or a receiving side interference invalidating method.

2. The method of claim 1, further comprising receiving a fallback mode-based downlink signal from the serving cell after the interference mitigation information is received until the interference mitigation scheme is applied.

3. The method of claim 2, wherein the fallback mode-based downlink signal is received by an SFBC (space-frequency block coding)-based transmit diversity scheme.

4. The method of claim 1, wherein the interference mitigation information is received via an RRC (radio resource control) layer signal.

5. The method of claim 1, wherein the interference mitigation information comprises information on a cell-specific reference signal transmitted from the neighboring cell.

6. The method of claim 5, wherein the information on the cell-specific reference signal corresponds to information on the number of antenna ports for the cell-specific reference signal transmitted from the neighboring cell.

7. A method of transmitting a signal by a serving cell to a user equipment in a wireless communication system, the method comprising:

transmitting, to the user equipment, interference mitigation information to mitigate interference from a neighboring cell,

wherein the interference mitigation information includes MBSFN (Multimedia Broadcast Multicast Service Single Frequency Network) subframe configuration information; and

transmitting a downlink signal to the user equipment by applying an interference mitigating scheme based on the interference mitigation information,

wherein the downlink signal is transmitted without applying the interference mitigating scheme when the downlink signal is transmitted at a MBSFN subframe indicated by the MBSFN subframe configuration information,

wherein the interference mitigating scheme is applied when the downlink signal is transmitted at a non-MBSFN subframe indicated by the MBSFN subframe configuration information, and

wherein the applying the interference mitigating scheme includes;

receiving, from the serving cell, interfering cell CRS pattern information indicating CRS pattern of the neighboring cell to which a specific interference mitigation scheme is always applied; and

applying the specific interference mitigation scheme indicated by the interfering cell CRS pattern information to the downlink signal,

wherein the specific interference mitigation scheme is one of a transmitting rate-matching method, a receiving side puncturing method or a receiving side interference invalidating method.

8. The method of claim 7, further comprising transmitting a fallback mode-based downlink signal to the user equipment after the interference mitigation information is transmitted until the user equipment receives a confirmation message for the application of the interference mitigation scheme.

9. The method of claim 8, wherein the fallback mode-based downlink signal is transmitted by an SFBC (space-frequency block coding)-based transmit diversity scheme.

10. The method of claim 7, wherein the interference mitigation information is transmitted via an RRC (radio resource control) layer signal.

11. The method of claim 7, wherein the interference mitigation information comprises information on a cell-specific reference signal transmitted from the neighboring cell.

12. The method of claim 11, wherein the information on the cell-specific reference signal corresponds to information on the number of antenna ports for the cell-specific reference signal transmitted from the neighboring cell.