Wireless Base Station Power Control via Path-Loss Estimation
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Solution Overview
Problem
Current radio communication systems lack effective methods for improving communication quality through transmission power control from transmission points in ultrahigh-density distributed antenna systems.
Innovation Solution
A radio base station with multiple transmission points and a signal processing unit that estimates path-loss and calculates power control weights for each antenna element to adjust transmission power, thereby enhancing communication quality by optimizing power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve signal strength for distant terminals, then communication quality improves, but interference increases for other terminals
Solution Approach 1:
The patent applies local quality by assigning different power control weights to different antenna elements based on their specific path-loss characteristics to individual terminals. Each antenna element's transmission power is independently adjusted according to the terminal's distance and channel conditions, rather than using uniform power control across all elements. This localized power adjustment improves signal strength for distant terminals while minimizing interference for others.
Solution Approach 2:
The patent changes the transmission power parameter dynamically by calculating power control weights based on estimated path-loss values. The signal processing unit adjusts the transmission power of each antenna element by applying calculated weights, transforming the power parameter from a fixed value to a dynamically optimized value that adapts to changing channel conditions and terminal positions.
2Device complexity
If transmission power is uniformly controlled across all antenna elements, then device complexity is reduced, but communication quality deteriorates due to inability to account for varying path-loss
Solution Approach 1:
The patent segments the power control mechanism by dividing the transmission points into multiple antenna elements, each with independent power control. Instead of treating all antenna elements as a single unit with uniform power control, the system segments them into individually controllable units, allowing path-loss-specific optimization for each element while maintaining manageable complexity through automated weight calculation.
Solution Approach 2:
The patent implements feedback by having the signal processing unit estimate path-loss for each antenna element and terminal combination, then use these estimates to calculate and adjust power control weights. This closed-loop feedback mechanism automatically optimizes transmission power based on actual channel conditions, improving communication quality without requiring complex manual configuration.
Data Source
AI summary
In a radio base station including: a plurality of transmission points each including at least one antenna element; and a signal processing unit connected to the plurality of transmission points, the signal processing unit includes: an estimating section that estimates, in each of the antenna elements, a path-loss with a radio terminal; and a calculating section that calculates a power control weight for controlling transmission power of each of the antenna elements based on the path-loss of the antenna element, which is estimated by the estimating section.