# US 10,321,338 B2 · Method and apparatus for cancelling an interference in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,321,338 B2 - Document ID: US10321338B2 - Status: Granted - Kind: B2 - Application number: 15/943,297 - Filed: 2018-04-02 - Published: 2018-08-16 - Granted: 2019-06-11 - Earliest claimed: 2013-02-28 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Taeyoon Kim; Mingoo Kim; Jonghan Lim; Chaeman Lim - Web page: https://patentgrep.com/patent/US10321338B2 ## CPC - H04W 24/02: Arrangements for optimising operational condition - H04B 1/7107: Subtractive interference cancellation - H04J 11/0046: {using joint detection algorithms} - H04J 11/0056: {Inter-base station aspects} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) ## Abstract A method and an apparatus for cancelling interference in a wireless communication system are provided. The method includes acquiring interference signal information on a reception signal received from a base station based on a preconfigured constellation set, and cancelling an interference signal from the reception signal by using the acquired interference signal information. Accordingly, reception performance in a cell edge can be improved by acquiring dominant interference signal information. ## Claims ### Claim 1 A method by a terminal in a wireless communication system, the method comprising: storing a pre-configured constellation set; receiving a signal from a base station; identifying a constellation among the pre-configured constellation set by selecting the constellation having a closest signal distribution with an interference target signal, the interference target signal being acquired by canceling a serving signal from the received signal; acquiring interference signal information on the received signal based on the identified constellation; and decoding the received signal based on the acquired interference signal information, wherein the acquired interference signal information is used to cancel an interference signal from the received signal. ### Claim 2 (depends on 1) The method of claim 1, wherein the pre-configured constellation set includes at least one constellation which corresponds to a pattern of the interference signal. ### Claim 3 (depends on 1) The method of claim 1, wherein the acquiring of the interference signal information comprises acquiring interference signal information in a pre-coded symbol unit. ### Claim 4 (depends on 1) The method of claim 1, wherein the identifying of the constellation among the pre-configured constellation set comprises: comparing a signal distribution of the interference target signal with each signal distribution of the pre-configured constellation set. ### Claim 5 (depends on 1) The method of claim 1, wherein the acquiring of the interference target signal comprises cancelling the serving signal from the received signal by using a reference signal of a serving cell. ### Claim 6 (depends on 1) The method of claim 1, wherein the acquiring of the interference target signal further comprises: regenerating the serving signal by using a result of decoding processing if the result of decoding processing exists; and cancelling the regenerated serving signal from the received signal by using the regenerated serving signal. ### Claim 7 (depends on 1) The method of claim 1, wherein the pre-configured constellation set is configured based on a combination of at least two of transmission mode information, layer information, precoding information and modulation order information. ### Claim 8 A terminal in a wireless communication system, the terminal comprising: a wireless communication unit configured to transmit and receive signals with a base station; a storage unit; and a controller configured to: store a pre-configured constellation set, control the wireless communication unit to receive a signal from the base station, identify a constellation among the pre-configured constellation set by selecting the constellation having a closest signal distribution with an interference target signal, the interference target signal being acquired by canceling a serving signal from the received signal, acquire interference signal information on the received signal based on the identified constellation, and decode the received signal based on the acquired interference signal information, wherein the acquired interference signal information is used to cancel an interference signal from the received signal. ### Claim 9 (depends on 8) The terminal of claim 8, wherein the pre-configured constellation set includes at least one constellation which corresponds to a pattern of the interference signal. ### Claim 10 (depends on 8) The terminal of claim 8, wherein the controller is further configured to compare a signal distribution of the interference target signal with each signal distribution of the pre-configured constellation set. ### Claim 11 (depends on 8) The terminal of claim 8, wherein the controller is further configured to cancel the serving signal from the received signal by using a reference signal of a serving cell. ### Claim 12 (depends on 8) The terminal of claim 8, wherein the controller is further configured to: regenerate the serving signal by using a result of decoding processing when the result of decoding processing exists, and cancel the regenerated serving signal from the received signal by using the regenerated serving signal. ### Claim 13 (depends on 8) The terminal of claim 8, wherein the pre-configured constellation set is configured based on a combination of at least two of transmission mode information, layer information, precoding information and modulation order information. ### Claim 14 A method by a terminal in a wireless communication system, the method comprising: storing a pre-configured constellation set; receiving a signal from a base station; identifying a constellation among the pre-configured constellation set by selecting the constellation having a closest signal distribution with an interference target signal, the interference target signal being acquired by canceling a serving signal from the received signal; acquiring interference signal information on the received signal based on the identified constellation; and decoding the received signal based on the acquired interference signal information. ### Claim 15 (depends on 14) The method of claim 14, wherein the pre-configured constellation set includes at least one constellation which corresponds to a pattern of the interference signal. ### Claim 16 A terminal in a wireless communication system, the terminal comprising: a wireless communication unit configured to transmit and receive signals with a base station; a storage unit; and a controller configured to: store a pre-configured constellation set, control the wireless communication unit to receive a signal from the base station, identify a constellation among the pre-configured constellation set by selecting the constellation having a closest signal distribution with an interference target signal, the interference target signal being acquired by canceling a serving signal from the received signal, acquire interference signal information on the received signal based on the identified constellation, and decode the received signal based on the acquired interference signal information. ### Claim 17 (depends on 16) The terminal of claim 16, wherein the pre-configured constellation set includes at least one constellation which corresponds to a pattern of the interference signal.