Base Station Downlink Multi-Antenna Transmission Control
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Solution Overview
Problem
In mobile communication systems, when there is no beamforming target terminal that feeds back beamforming control information coinciding with null steering control information, the base station cannot effectively utilize downlink multi-antenna transmission, leading to inefficiencies in radio resource usage and interference suppression.
Innovation Solution
A base station that includes a receiver for collecting beamforming and null steering control information, and a controller that selects a beamforming target terminal based on a predefined rank indicator when no matching information is available, such as the highest rank or smallest interfering level deviation, to ensure effective downlink multi-antenna transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station selects a beamforming target terminal based on matching beamforming control information with null steering control information, then the downlink multi-antenna transmission efficiency is improved, but the system cannot operate when no matching terminal exists
Solution Approach 1:
The base station performs preliminary selection of a beamforming target terminal based on predefined criteria (such as highest rank indicator or smallest interfering level deviation) before the matching process fails. This preliminary action ensures that the system can continue operating smoothly even when no exact match is found, resolving the contradiction between transmission efficiency and system adaptability.
2Manufacturing precision
If the base station waits for matching beamforming control information, then transmission accuracy is improved, but radio resource usage efficiency deteriorates
Solution Approach 1:
The base station applies partial matching criteria rather than requiring exact matches. By accepting terminals with predefined rank indicators even when exact beamforming control information matching is not achieved, the system maintains adequate transmission accuracy while significantly improving radio resource usage efficiency through faster terminal selection.
Data Source
AI summary
In a mobile communication system that supports downlink multi-antenna transmission, a base station managing a cell receives beamforming control information fed back from each of a plurality of beamforming target terminals connected to the cell, and null steering control information fed back from a null steering target terminal. When there exists no beamforming target terminal that feeds back the beamforming control information that coincides with the null steering control information, the base station selects, as a pair terminal, a beamforming target terminal that feeds back the beamforming control information containing a predefined rank indicator.