Radio Terminal Power Control via Path-Loss Estimation
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Solution Overview
Problem
Current radio communication systems lack effective transmission power control mechanisms to improve communication quality between radio terminals and transmission points in ultrahigh-density distributed antenna systems.
Innovation Solution
A radio terminal equipped with an estimating section to calculate path-loss between antenna elements and transmission points, and a calculating section to determine power control weights for each antenna element, enabling dynamic transmission power adjustment based on estimated path-loss to enhance communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve communication quality, then communication quality is improved, but interference to other transmission points increases
Solution Approach 1:
The patent applies local quality by calculating separate path-loss values for each antenna element to each transmission point and determining individual power control weights for each antenna element. This allows each antenna element to transmit at an optimized power level tailored to its specific channel conditions, improving communication quality while minimizing interference to specific transmission points.
Solution Approach 2:
The patent changes the transmission power parameter dynamically by calculating power control weights based on estimated path-loss values. The transmission power of each antenna element is adjusted according to the calculated weights, which are derived from the channel conditions between each antenna element and transmission points, thereby optimizing communication quality while controlling interference.
2Reliability
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 conditions
Solution Approach 1:
The patent segments the power control process by calculating separate path-loss values and power control weights for each antenna element individually. Instead of applying a uniform power control approach, the system divides the antenna elements into separate control units, each with its own weight calculation based on specific channel conditions, thereby improving communication quality while maintaining manageable complexity through systematic segmentation.
3Productivity
If path-loss estimation is performed for each antenna element to each transmission point, then transmission power optimization is improved, but calculation complexity increases
Solution Approach 1:
The radio terminal performs self-service by autonomously estimating path-loss for each antenna element to each transmission point and calculating its own power control weights without requiring external control from the base station. This self-contained approach optimizes transmission power efficiently while managing calculation complexity through systematic automated procedures that the terminal executes independently.
Data Source
AI summary
A radio terminal that performs radio communication with 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 includes a plurality of antenna elements, an estimating section that estimates path-loss between each of the plurality of antenna elements and the plurality of transmission points, and a calculating section that calculates a power control weight for controlling transmission power of the plurality of antenna elements based on the path-loss for the antenna element that has been estimated by the estimating section.