Weighted RSRP Measurement for Interference Mitigation
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Solution Overview
Problem
Conventional Reference Signal Received Power (RSRP) measurements in LTE cellular communication networks are degraded by inter-cell interference, requiring a large number of time-frequency samples to maintain accuracy, which increases power consumption in mobile terminals.
Innovation Solution
The mobile terminal selects weighting parameters for time-frequency samples of the reference signal to minimize the combined impact of inter-cell interference from synchronized and non-synchronized interfering cells, along with thermal noise, allowing for accurate RSRP measurements with fewer samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RSRP measurement techniques are used, then measurement accuracy can be maintained, but the number of time-frequency samples required increases significantly, leading to increased power consumption
Solution Approach 1:
The patent changes the measurement parameters by introducing weighted averaging with dynamically selected weights for different time-frequency samples. Instead of uniform averaging, the system adjusts the weight of each sample based on interference conditions, allowing accurate RSRP measurement with fewer samples and reduced power consumption
Solution Approach 2:
The patent implements dynamic adaptation by selecting different weighting strategies based on detected interference conditions. The system dynamically adjusts measurement parameters and weight values according to the actual interference environment, optimizing the balance between measurement accuracy and power consumption in real-time
2Use of energy by moving object
If the number of time-frequency samples is reduced to decrease power consumption, then power consumption decreases, but measurement accuracy deteriorates in the presence of inter-cell interference
Solution Approach 1:
The patent modifies the measurement parameters by applying optimized weighting factors to time-frequency samples. This allows the system to achieve accurate RSRP measurements with a reduced number of samples by changing how the available samples are utilized, rather than simply increasing sample count
Solution Approach 2:
The patent uses reference signals from synchronized cells as virtual copies to estimate and compensate for interference. By copying and analyzing the known reference signal patterns from interfering cells, the system can subtract their contribution from the measurement, improving accuracy with fewer actual measurement samples
3Ease of operation
If uniform weighting is applied to all time-frequency samples, then the measurement process is simple, but the impact of inter-cell interference is not minimized
Solution Approach 1:
The patent applies different weight values to different time-frequency samples based on their local interference characteristics. Instead of uniform weighting, each sample is weighted according to its specific interference condition, with higher weights given to samples with lower interference and lower weights to samples with higher interference
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors interference conditions and adjusts the weighting parameters accordingly. The measured interference levels feed back into the weight selection process, allowing the system to adaptively optimize measurement accuracy in response to changing interference conditions
Data Source
AI summary
Systems and methods are disclosed for measuring received signal power at a mobile terminal in a cellular communications network in such a manner as to efficiently provide highly accurate received signal power measurements in the presence of strong inter-cell interference. In one embodiment, in order to measure received signal power for a measured cell, a mobile terminal selects weighting parameters for a number of time-frequency samples of a reference signal of the measured cell based, at least in part, on inter-cell interference from one or more synchronized interfering cells and inter-cell interference from one or more non-synchronized interfering cells. The mobile terminal applies the time-frequency samples of the reference signal of the measured cell and the corresponding weighting parameters to corresponding time-frequency samples of a received signal from the measured cell in order to obtain a measurement of the received power for the measured cell.