Cell Selection Correction for Directional Beam Power Allocation
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Solution Overview
Problem
In cellular systems employing large-scale MIMO beamforming, the power allocation difference between directional beams for reference signals and data signals leads to inaccurate cell selection, as measurement results do not accurately reflect the actual received power and quality of data signals.
Innovation Solution
The system corrects cell selection by using correction information that accounts for the power allocation difference between reference signals and data signals, allowing for appropriate cell selection during transmission over directional beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference signals are transmitted over directional beams with different power allocation, then beamforming capacity is improved, but measurement accuracy deteriorates
Solution Approach 1:
The patent introduces a power allocation parameter difference between reference signals and data signals in directional beam transmission. By adjusting the power allocation parameters independently for reference signals versus data signals, the system can optimize beamforming capacity while accounting for the resulting measurement discrepancies through correction mechanisms.
2Productivity
If directional beam transmission is used, then system capacity is improved, but cell selection accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where measurement results from directional beam transmission are compared against expected values, and correction information is generated based on the power allocation differences. This feedback loop allows the system to maintain high capacity while improving cell selection accuracy by compensating for measurement deviations.
3Productivity
If power is allocated differently for reference signals and data signals, then transmission efficiency is improved, but measurement reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and applying correction information before cell selection decisions are made. The power allocation difference between reference signals and data signals is anticipated and compensated for in advance, ensuring that measurements remain reliable even with differentiated power allocation for transmission efficiency.
Data Source
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AI summary
[Object] To select cell more appropriately when transmission over directional beams is performed. [Solution] There is provided an apparatus comprising: an acquisition unit that acquires information for correcting a result of measurements of a reference signal which is used for selecting a cell and transmitted over a plurality of directional beams in different directions; and a control unit that notifies a terminal apparatus of the information.