Inter-Cell Interference Cancellation in Massive MIMO Systems
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Solution Overview
Problem
In massive multiple input multiple output (MIMO) systems, existing technologies face challenges in effectively managing inter-cell interference, particularly in identifying and mitigating interference areas between neighboring base stations, which limits efficient scheduling and resource allocation.
Innovation Solution
A method and apparatus for transmitting interference area information, including vertical and horizontal angles of interfering beams, and area numbers, between base stations to enable effective scheduling and interference cancellation, utilizing the X2 interface for communication and beamforming adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations transmit detailed interference information (vertical and horizontal angles of interfering beams, area numbers) to neighboring base stations, then inter-cell interference cancellation effectiveness is improved, but communication overhead and system complexity increase
Solution Approach 1:
The patent segments interference information into distinct components: vertical beam angles, horizontal beam angles, and area numbers. This segmentation allows neighboring base stations to receive and process only the specific interference parameters relevant to their coverage areas, reducing unnecessary communication overhead while maintaining interference cancellation effectiveness.
Solution Approach 2:
The patent implements local quality by transmitting interference information specifically tailored to each neighboring base station's coverage area. Each base station receives interference data (vertical angles, horizontal angles, area numbers) that is locally relevant to its specific geographic area and beamforming configuration, rather than receiving generic global interference data from all base stations.
2Measurement precision
If base stations exchange comprehensive interference area information including beam angles and area numbers, then scheduling accuracy in coverage areas is improved, but information processing time and computational complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-defining and numbering coverage areas (area numbers) at each base station before interference occurs. These area numbers are assigned based on beamforming configurations and coverage zones. When interference happens, base stations can quickly reference these pre-established area numbers and associated beam angle information, eliminating the need for complex real-time calculations and reducing processing time.
Solution Approach 2:
The patent uses copying by transmitting structured interference information (vertical angles, horizontal angles, area numbers) that replicates the essential geometric and spatial characteristics of the interfering beams. This copied information allows neighboring base stations to accurately reconstruct the interference scenario without needing to perform complex measurements or calculations, thereby improving scheduling accuracy while minimizing processing time.
Data Source
AI summary
The present invention relates to a method and an apparatus for transmitting information among base stations for inter-cell interference cancellation in a massive MIMO or FD-MIMO system. A base station acquires interference area information, which is information on an area causing interference to a neighbor base station, and transmits the interference area information to the neighbor base station. The interference area information may include any one from among the vertical and horizontal angles of a beam causing interference to the neighbor base station, or the number of the area causing interference to the neighbor base station.