Method and apparatus for receiving downlink data through interference signal cancellation and suppression in wireless communication system

Patent metadata

Field	Value
Publication number	US-10680741-B2
Application number	US-201515502424-A
Country	US
Kind code	B2
Filing date	Aug 20, 2015
Priority date	Aug 20, 2014
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

The present disclosure relates to a communication technique and a system thereof for fusing, with IoT technology, a 5G communication system for supporting a higher data transmission rate than a beyond 4G system. The present disclosure may be applied to intelligent services (such as smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail business, security and safety related services, etc.). The present disclosure relates to a method for receiving downlink data of a terminal in a wireless communication system, and suggests a method and an apparatus for receiving downlink data, the method comprising: a step for checking a transmission parameter regarding data being transmitted from an interference cell; a step for determining, on the basis of the transmission parameter, whether or not an interference signal exists; a step for determining, on the basis of any one of the transmission parameter and the determination on whether or not an interference signal exists, whether or not network assisted interference cancellation and suppression (NAICS) technology is applied; and a step for decoding the downlink data on the basis of the determination on whether or not the NAICS technology is applied.

First claim

The invention claimed is:

1. An interference cancellation method of a terminal in a mobile communication system, the method comprising:
receiving first transmission parameters of an interference channel;
determining whether the interference channel supports a predetermined transmission mode (TM) based on the first transmission parameters;
estimating, when the interference channel supports the predetermined TM, a channel state of the interference channel using a demodulation reference signal (DMRS) determined based on a blind detection with a group of virtual cell identifier-scrambling identifier (VCID-SCID) combinations of the interference channel;
obtaining a second transmission parameter of the interference channel based on the channel state, wherein the second transmission parameter includes at least one of a modulation order, a rank indicator, or a precoding matrix index of an interference cell causing the most aggressive interference to the terminal; and
canceling interference to the terminal based on the second transmission parameter of the interference channel.

2. The method of claim 1 , wherein the predetermined transmission mode is a transmission mode 10 (TM10).

3. The method of claim 1 , further comprising:
determining whether the transmission mode of the terminal is the predetermined transmission mode; and
identifying, when the transmission mode of the terminal is the predetermined transmission mode, the VCID and SCID for data transmission to the terminal through a control channel,
wherein the blind detection is performed with the group from which the VCID-SCID combination used in the data transmission to the terminal is excluded.

4. The method of claim 1 , further comprising:
determining whether the DMRS is included in the group; and
performing the blind detection only with the VCID-SCID combinations with which the DMRS is detected.

5. The method of claim 4 , wherein the blind detection is performed with a predetermined number of VCID-SCID combinations among the VCID-SCID combinations with which the DMRS is detected.

6. The method of claim 1 , further comprising:
arranging the VCID-SCID combinations based on interference channel strength information of respective VCID-SCID combinations included in the group; and
performing the blind detection in an order of arrangement.

7. The method of claim 2 , wherein the blind detection is performed by assigning priorities to the VCID-SCID combinations.

8. The method of claim 1 , further comprising performing, when the interference channel does not support the predetermined TM, the blind detection with a group of physical cell identifier-scrambling identifier (PCID-SCID) combinations of the interference channel.

9. A terminal in a mobile communication system, the terminal comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured to:
receive first transmission parameters of an interference channel,
determine whether the interference channel supports a predetermined transmission mode (TM) based on the first transmission parameters,
estimate, when the interference channel supports the predetermined TM, a channel state of the interference channel using a demodulation signal (DMRS) determined based on a blind detection with a group of virtual cell identifier-scrambling identifier (VCID-SCID) combinations of the interference channel,
obtain a second transmission parameter of the interference channel based on the channel state, wherein the second transmission parameter includes at least one of a modulation order, a rank indicator, or a precoding matrix index of an interference cell causing the most aggressive interference to the terminal, and
cancel interference to the terminal based on the second transmission parameter of the interference channel.

10. The terminal of claim 9 , wherein the predetermined transmission mode is a transmission mode 10 (TM10).

11. The terminal of claim 9 , wherein the controller is further configured to:
determine whether the transmission mode of the terminal is the predetermined transmission mode, and
identify, when the transmission mode of the terminal is the predetermined transmission mode, the VCID and SCID for data transmission to the terminal through a control channel,
wherein the blind detection is performed with the group from which the VCID-SCID combination used in the data transmission to the terminal is excluded.

12. The terminal of claim 9 , wherein the controller is further configured to:
determine whether the DMRS is included in the group, and
perform the blind detection only with the VCID-SCID combinations with which the DMRS is detected.

13. The terminal of claim 12 , wherein the blind detection is performed with a predetermined number of VCID-SCID combinations among the VCID-SCID combinations with which the DMRS is detected.

14. The terminal of claim 9 , wherein the controller is further configured to:
arrange the VCID-SCID combinations based on interference channel strength information of respective VCID-SCID combinations included in the group, and
perform the blind detection in an order of arrangement.

15. The terminal of claim 10 , wherein the controller is further configured to assign priorities to the VCID-SCID combinations with which the blind detection is performed.

16. The terminal of claim 9 , wherein the controller is further configured to perform, when the interference channel does not support the predetermined TM, the blind detection with a group of physical cell identifier-scrambling identifier (PCID-SCID) combinations of the interference channel.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Oh Jinyoung
• Lee Hyojin
• Shin Cheolkyu
• Lee Juho

Classifications

• H04L5/0073

  Allocation arrangements that take into account other cell interferences · CPC title

• H04W72/042

  Electricity · mapped topic

• H04L1/0038

  Blind format detection (for detection of modulation format H04L27/0012) · CPC title

• H04L1/001 Primary

  applied to control information · CPC title

• H04J11/00

  Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence) · CPC title