Full-Load PSD Estimation for LTE Network Search
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Solution Overview
Problem
Variations in traffic load cause Power Spectral Density (PSD) fluctuations in transmitted signals, affecting the accuracy of network search processes in communication terminals, as they estimate PSD under partial-load conditions rather than full-load conditions.
Innovation Solution
A method and system in a communication terminal to estimate the PSD that would exist under full-load conditions by defining and testing multiple hypotheses of time-frequency bins for received signals, measuring power levels, and selecting the hypothesis with the maximal power level to compute the estimated full-load PSD, which is then used for network search processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal estimates PSD based on received signals under partial-load conditions, then the measurement process is simple and fast, but the accuracy of PSD estimation deteriorates because it does not reflect full-load conditions
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple hypotheses about possible transmitter configurations (number of antennas, reference signal patterns, time-frequency resource allocations) before actual measurement. The terminal prepares these hypotheses in advance based on known communication standards, then tests them against received signals to infer the actual configuration and estimate full-load PSD accurately without requiring complex real-time analysis of all possible scenarios
Solution Approach 2:
The patent changes parameters by transitioning from directly measuring PSD of received signals to inferring PSD through hypothesis testing about transmitter configuration parameters. By estimating parameters such as number of transmit antennas, reference signal power, and resource allocation patterns, the terminal can compute the equivalent full-load PSD that would result if all hypothetical transmitters were active, thereby achieving accurate PSD estimation without directly observing full-load conditions
2Reliability
If the terminal uses multiple hypotheses to estimate full-load PSD, then the accuracy and robustness of network search improves, but the computational complexity and processing time increases
Solution Approach 1:
The patent applies segmentation by dividing the network search process into distinct stages: signal reception and preprocessing, hypothesis testing for configuration identification, and full-load PSD estimation. Each stage processes specific aspects of the problem independently, allowing the terminal to systematically evaluate multiple hypotheses without overwhelming computational burden. The segmentation enables parallel processing of different hypotheses and efficient utilization of received signal data
Solution Approach 2:
The patent applies partial action by testing a limited set of predefined hypotheses that cover the most probable transmitter configurations rather than exhaustively analyzing all possible scenarios. The hypotheses are designed to include the actual configuration plus plausible alternatives, allowing the terminal to achieve sufficient accuracy for network search without the computational overhead of complete enumeration. This selective approach maintains reliability while improving processing speed
Data Source
AI summary
A method includes receiving a signal in a communication terminal. A power spectral density, which the signal would have under full-load conditions of a transmitter transmitting the signal, is estimated based on the received signal. An operation is performed in the communication terminal using the estimated power spectral density.