SIR Estimation Correction for Power Control Stability
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Solution Overview
Problem
Current SIR estimation methods, such as P-over-variance and GRAKE, face challenges in accurately controlling transmit power due to self-interference, leading to power rushes and system instability, especially in scenarios with dominant self-interference.
Innovation Solution
A method that generates an estimated SIR value by multiplying a first estimated SIR value by a numerical factor dependent on the channel estimate and combining weight, which enlarges the SIR value when self-interference is significant, reducing the risk of power rushes and enhancing power control robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional SIR estimation methods (P-over-variance, GRAKE) are used for power control, then the power control system operates with standard complexity, but the system experiences power rushes and instability due to inaccurate SIR estimation in self-interference scenarios
Solution Approach 1:
The patent modifies the SIR estimation by introducing a correction factor that adjusts the estimated SIR value based on self-interference conditions. The corrected SIR is calculated as SIR_corrected = SIR_estimated × (1 + α × β), where α controls the correction strength and β represents the self-interference level. This parameter adjustment resolves the contradiction by improving measurement accuracy without fundamentally changing the power control system's reliability framework.
Solution Approach 2:
The patent replaces the conventional SIR estimation mechanism with an improved estimation method that incorporates self-interference compensation. Instead of using raw estimated SIR values from traditional methods, the system substitutes them with corrected values that account for self-interference, thereby improving accuracy while maintaining system stability through the correction factor mechanism.
2Measurement precision
If the numerical correction factor is applied to adjust SIR estimation, then the SIR measurement precision is improved in self-interference scenarios, but the device complexity increases due to additional calculations
Solution Approach 1:
The patent introduces a correction factor with controllable strength (α) that balances accuracy improvement against computational complexity. By adjusting α, the system can optimize the trade-off between SIR estimation accuracy and the additional computational burden, allowing deployment on devices with varying processing capabilities.
Solution Approach 2:
The patent applies partial correction through the adjustable parameter α, which controls the degree of self-interference compensation. When computational resources are limited, α can be set to lower values providing moderate correction with reduced complexity. When resources are abundant, α can be increased to maximize accuracy improvement, embodying the partial action principle.
Data Source
AI summary
The present invention provides a method which performs an estimation of a SIR as basis for transmit power control. The SIR estimation is performed for a radio signal (u) which is transmitted from a transmitter (35) to a receiver (43) over a radio channel (37). A channel estimate h and a combining weight w are first obtained (83). Then an estimated SIR value is generated (85) based at least in part on the channel estimate h and the combining weight w. The estimated SIR value is generated such that it equals a first estimated SIR value multiplied by a numerical factor. The numerical factor is dependent on the channel estimate h and the combining weight w in a manner such that it attains a minimum value whenever the channel estimate h and the combining weight w are linearly dependent. The invention also comprises devices for carrying out the method.