Base Station Beam-Forming Path Exclusion for Interference Prevention
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Solution Overview
Problem
In 5G base stations, beam-forming to transmit downlink signals can cause interference among terminal apparatuses due to radio wave propagation characteristics, leading to deteriorated reception quality at unintended terminal apparatuses, as existing technologies do not account for such interference.
Innovation Solution
A base station performs channel estimations on multiple terminal apparatuses, compares angular profiles to determine a transmission layer for a target terminal apparatus, and excludes paths within a certain angular range of comparable terminal apparatuses to prevent interference, thereby improving reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam-forming is used to transmit downlink signals to a target terminal apparatus, then transmission gain and signal quality to the target terminal apparatus are improved, but interference occurs to other terminal apparatuses and their reception quality deteriorates
Solution Approach 1:
The base station performs preliminary channel estimation and angular profile comparison before transmitting the downlink signal. By identifying and excluding paths that would cause interference to other terminal apparatuses in advance, the system prevents interference before it occurs, thereby maintaining high reception quality for the target terminal without degrading service to other terminals
Solution Approach 2:
The transmission path is segmented into multiple candidate paths based on angular profiles. The base station divides the potential transmission paths and selectively excludes those that would cause interference to other terminal apparatuses, allowing only safe paths to be used for beam-forming transmission
2Object-affected harmful factors
If path exclusion process is performed to prevent interference, then interference among terminal apparatuses is reduced, but transmission layers and system complexity increase
Solution Approach 1:
The system changes the parameter of path selection by introducing angular profile comparison as a new criterion. Instead of using only channel quality metrics, the base station incorporates angular information to identify and exclude paths that would cause interference, thereby reducing interference without requiring complex multi-layer transmission schemes
Data Source
AI summary
In order to make it possible to prevent occurrence of an interference among terminal apparatuses when a base station forms a beam toward a terminal apparatus by beam-forming to transmit a downlink signal, and to improve reception quality at a terminal apparatus. A base station of the present disclosure includes a memory storing instructions and one or more processors configured to execute the instructions to: perform channel estimations respectively on a plurality of terminal apparatuses; and determine a transmission layer of a target terminal apparatus by comparing angular profiles respectively obtained on the basis of channel estimates on the target terminal apparatus and at least one comparable terminal apparatus out of the plurality of terminal apparatuses and performing a path exclusion process to exclude, from transmission layers of the target terminal apparatus, a path that falls within a certain angular range around a path angle indicated by an angular profile of the at least one comparable terminal apparatus.