Base Station Downlink Quality Correction via Null Steering
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Solution Overview
Problem
The accuracy of downlink communication quality in radio communication systems is not sufficiently enhanced, leading to potential performance degradation in base stations due to inadequate feedback mechanisms.
Innovation Solution
A base station system that uses multiple antennas to control transmission directivity based on known signals from communication terminals, employing correction values calculated from response signals to improve the accuracy of downlink communication quality, with methods for null steering and beamforming to optimize radio resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If downlink communication quality is measured using conventional feedback mechanisms, then the base station can obtain quality information, but the accuracy of the downlink communication quality is not sufficiently enhanced
Solution Approach 1:
The patent implements a feedback mechanism where the communication terminal feeds back not only the downlink communication quality but also response signals indicating whether signals were properly received. This dual feedback approach allows the base station to calculate correction values that improve the accuracy of downlink communication quality measurements, directly resolving the contradiction between measurement precision and system reliability
Solution Approach 2:
The base station performs null steering based on known signals transmitted from the communication terminal before actual downlink communication. This preliminary action of configuring transmission directivity and calculating correction values in advance ensures that the downlink communication quality measurements are more accurate from the outset, preventing performance degradation rather than correcting it later
2Measurement precision
If the base station uses multiple antennas with null steering and beamforming, then transmission directivity is controlled and quality measurement is improved, but device complexity increases
Solution Approach 1:
The communication terminal transmits known signals that enable the base station to automatically calculate correction values and configure transmission directivity without requiring complex external calibration equipment. The terminal essentially serves its own purpose of facilitating base station measurement improvement, reducing the need for additional complex devices at the base station
Solution Approach 2:
The known signals transmitted by the communication terminal serve multiple functions: they enable null steering configuration, provide basis for correction value calculation, and facilitate beamforming optimization. This multi-functionality reduces the need for separate dedicated signals or procedures, thereby limiting the increase in device complexity while still achieving improved measurement precision
Data Source
AI summary
In a base station, a downlink radio resource and an uplink radio resource to be used for transmission of a known signal from a communication terminal are associated for null steering to be performed based on the known signal. A correction value calculating unit calculates a first correction value used to correct a downlink quality value obtained by a communication terminal. The correction value calculating unit calculates a second correction value used to correct a downlink quality value obtained by a communication terminal.