KR-20260065012-A - Enhancement Method of Interference in mobile communication system and base station device supporting the same

KR20260065012AKR 20260065012 AKR20260065012 AKR 20260065012AKR-20260065012-A

Abstract

The present invention discloses an interference improvement method and a base station device supporting the same, comprising the steps of: a serving base station device collecting location-related information of an adjacent user terminal located in a boundary section overlapping with the communication coverage of an adjacent base station device; a step of estimating the direction of the adjacent user terminal based on the location-related information; and a step of performing beamforming such that a Null region is set in which a signal from the serving base station device is not transmitted toward the direction of the adjacent user terminal.

Inventors

안혜민

Assignees

에스케이텔레콤 주식회사

Dates

Publication Date: 20260508
Application Date: 20241031

Claims (10)

A serving base station device collects location-related information of an adjacent user terminal located in a boundary section that overlaps with the communication coverage of an adjacent base station device; A step of estimating the direction of the adjacent user terminal based on the above location-related information; A method for operating a base station device that supports interference improvement, characterized by including the step of performing beamforming so that a Null region is set in which the signal of the serving base station device is not transmitted toward the direction of the adjacent user terminal.
In paragraph 1, The step of checking the degree of interference of the adjacent user terminal mentioned above is further included, The step of performing the above beamforming is, If the degree of interference is less than a preset first reference value, a step of setting a first error angle based on the centerline of the direction of the adjacent user terminal; A method of operating a base station device that supports interference improvement, comprising the step of adjusting beamforming so that a Null region including the first error angle is formed.
In paragraph 2, The step of performing the above beamforming is, If the degree of interference exceeds a preset first reference value, a step of setting a second misalignment angle greater than the first error angle based on the centerline of the direction of the adjacent user terminal; A method of operating a base station device that supports interference improvement, comprising the step of adjusting beamforming so that a Null region including the above-mentioned second error angle is formed.
In paragraph 1, The above-mentioned estimation step is, When a plurality of adjacent user terminals are located in the above boundary section, a step of selecting a specific adjacent user terminal among the plurality of adjacent user terminals that causes maximum interference to the signal of the serving base station device; A method of operating a base station device that supports interference improvement, comprising the step of estimating the direction of a specific adjacent user terminal selected above.
In paragraph 1, A step of collecting location-related information of a serving user terminal located in the above boundary section; The method further includes the step of estimating the direction of the serving user terminal based on location-related information of the serving user terminal. The step of performing the above beamforming is, A method of operating a base station device that supports interference improvement, comprising the step of performing beamforming such that the gain of the main lobe directed toward the serving user terminal is maximized while forming a Null region directed toward the adjacent user terminal.
As a computer program stored on a computer-readable recording medium, The above computer program is, A computer program comprising instructions for a processor to perform a method according to any one of paragraphs 1 through 5.
Memory for storing at least one instruction executed by a processor; The above at least one instruction is, Collect location-related information of adjacent user terminals located in boundary sections that overlap with the communication coverage of adjacent base station devices, and Estimating the direction of the adjacent user terminal based on the above location-related information, and A base station device that supports interference improvement, characterized by being configured to perform beamforming by applying a Null region in which the signal of the serving base station device is not transmitted toward the direction of the adjacent user terminal.
In Paragraph 7, The above at least one instruction is, Check the degree of interference of the aforementioned adjacent user terminal, and If the degree of interference is less than a preset first reference value, a first error angle is set based on the centerline of the direction of the adjacent user terminal, and beamforming is adjusted so that a Null region including the first error angle is formed. A base station device that supports interference improvement, characterized in that when the degree of interference exceeds a preset first reference value, a second misalignment angle greater than the first error angle is set based on the centerline of the direction of the adjacent user terminal, and beamforming is adjusted to form a Null region including the second error angle.
In Paragraph 7, The above at least one instruction is, A base station device that supports interference improvement, characterized by being configured to select a specific adjacent user terminal that causes maximum interference to the signal of the serving base station device among the plurality of adjacent user terminals when a plurality of adjacent user terminals are located in the above boundary section, and to estimate the direction of the selected specific adjacent user terminal.
In Paragraph 7, The above at least one instruction is, Collects location-related information of a serving user terminal located in the above boundary section, and estimates the direction of the serving user terminal based on the location-related information of the serving user terminal, A base station device that supports interference improvement, characterized by being configured to perform beamforming in which the gain of the main lobe directed toward the serving user terminal is maximized while forming a Null region directed toward the adjacent user terminal.

Description

Enhancement Method of Interference in mobile communication system and base station device supporting the same The present invention relates to a technology capable of improving signal interference between base stations in a mobile communication system environment. Base station devices (e.g., base station antennas and base station controllers) built for mobile communication services can form cells corresponding to communication coverage so as to be responsible for communication services in a certain area. The cells can be built in various forms depending on the communication method supported by the mobile communication service. For example, in the case of mobile communication services of 5G or higher, the cells are built based on beamforming. Accordingly, multiple beamforming areas are formed in the cells covered by a single base station device, and user terminals (UEs, user equipment) located in each beamforming area can identify the type, direction, and rank of the beam corresponding to their location and perform communication with the base station device. Meanwhile, in actual wireless communication environments (or mobile communication system environments), multiple base station devices may be deployed. In such environments, each base station device forms its own communication coverage, and in this process, boundary sections where communication coverage overlaps with adjacent base stations may be formed. Consequently, when transmitting data by base station device, user terminals located within the coverage of each base station device that fall within the aforementioned boundary sections may experience performance degradation due to interference caused by signal transmission from adjacent base station devices. Accordingly, various measures are being proposed to mitigate interference in boundary sections within mobile communication system environments. FIG. 1 is a drawing showing an example of at least a part of a mobile communication system environment according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a user terminal configuration according to an embodiment of the present invention. FIG. 3 is a diagram showing an example of a base station device configuration according to an embodiment of the present invention. FIG. 4 is a diagram showing an example of a base station processor configuration according to an embodiment of the present invention. FIG. 5 is a diagram illustrating an example of a beamforming operation of a base station device according to an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of Null beamforming based on an AoA section according to an embodiment of the present invention. FIG. 7 is a diagram showing an example of applying an error angle related to an error setting according to an embodiment of the present invention. FIG. 8 is a diagram showing another example of a boundary section of a mobile communication system environment according to an embodiment of the present invention. FIG. 9 is a diagram showing an example of base station device operation related to interference improvement of a mobile communication system according to an embodiment of the present invention. FIG. 10 is a diagram showing another example of base station device operation related to interference improvement of a mobile communication system according to an embodiment of the present invention. FIG. 11 is a diagram showing an example of base station device operation that supports error setting related to interference improvement of a mobile communication system according to an embodiment of the present invention. Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings. In one embodiment of the present invention described below, a method and apparatus are provided for improving communication quality and reducing interference by controlling the directionality of a signal in a mobile communication system. For example, in a modern communication standard such as 5G, the present invention can estimate the direction of an adjacent user terminal based on a Sounding Reference Signal (SRS) transmitted by an adjacent user terminal (e.g., I_UE, Interference User Equipment, interference user terminal, or interference target terminal) connected to an adjacent base station device, and control (e.g., Null beamforming) so that a signal is not transmitted in the estimated direction of the adjacent user terminal. Furthermore, the present invention can achieve improved beamforming performance by supporting an error setting function to prevent or reduce the occurrence of an error in the direction estimation of the adjacent user terminal. Hereinafter, the configuration of a mobile communication system environment including the interference improvement method in a mobile communication system of the present invention and a base station device supporting the same, as well as the role of each component,