Channel Condition Indication Determination via Interference Segmentation
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Solution Overview
Problem
Current methods for determining downlink channel condition indicators in wireless communication systems have limitations in accuracy and complexity, particularly in interference and cancellation scenarios, which can lead to suboptimal data throughput and error rates.
Innovation Solution
The method involves determining channel condition indicators by accounting for the composition of interference, specifically the signal strength of dominating interfering cells and the type of demodulator used, with adjustments based on the own cell geometry factor and a metric value, allowing for more accurate CQI/CSI mapping and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional SIR-to-CQI mapping methods are used, then the implementation complexity is low, but the measurement precision of channel condition indication is insufficient
Solution Approach 1:
The patent changes the parameters used in CQI determination from traditional SIR-only mapping to a composite metric that includes SIR, interference composition, and demodulator type. This transforms the mapping function from a simple two-parameter system to a multi-parameter system that captures more channel characteristics, thereby improving measurement precision while managing complexity through structured parameter organization
Solution Approach 2:
The patent segments the interference component into individual interfering cell contributions, allowing the system to analyze and report channel conditions for each interfering cell separately. This segmentation enables more precise channel condition indication by breaking down the complex interference environment into manageable, analyzable components that can be processed independently and then aggregated
2Productivity
If simple CQI mapping is used, then the device complexity is low, but the data throughput is reduced due to suboptimal error rate compliance
Solution Approach 1:
The patent performs preliminary analysis of interference composition and demodulator characteristics before determining the final CQI value. By pre-characterizing the interference environment and demodulator performance, the system can make more accurate CQI selections that optimize throughput, while the preliminary analysis results are cached and reused to avoid redundant computations
Solution Approach 2:
The patent replaces traditional mechanical SIR-to-CQI mapping tables with an adaptive determination system that uses mathematical models to account for interference composition and demodulator type. This substitution allows for more precise CQI calculation that adapts to varying channel conditions, improving throughput while the structured mathematical approach keeps computational complexity manageable
3Reliability
If adaptive CQI mapping considering interference composition is used, then the reliability of error rate compliance improves, but the device complexity increases
Solution Approach 1:
The patent incorporates feedback mechanisms where the determined CQI values and associated metrics are monitored and used to refine future CQI determinations. The system learns from past channel conditions and adjustment outcomes, progressively improving error rate compliance while the feedback loop is structured to avoid excessive computational overhead through incremental updates rather than complete recalculations
Data Source
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AI summary
A method is provided of a wireless communication device operating in connection with a cellular communication system providing a serving cell and one or more interfering cells. A signal is received comprising symbols of the serving cell transmitted in a downlink channel and symbols of the one or more interfering cells and a first function of a signal-to-interference ratio of the received signal is calculated. One or more of the interfering cells are selected as dominant interfering cells based on a respective average power of reference symbols of the one or more interfering cells in the received signal, an average power of demodulated symbols of the serving cell in the received signal and a respective average power of demodulated symbols of each of the dominant interfering cells in the received signal are determined. A metric value is calculated based on the average power of demodulated symbols of the serving cell and on the respective average power of demodulated symbols of each of the dominant interfering cells, a channel condition indication is determined based on the metric value and the first function of the signal-to-interference ratio of the received signal, and the channel condition indication is transmitted to the cellular communication system, thereby providing downlink channel condition information to a network node. A method of creating a look-up table for mapping the first function and the metric value to the channel condition indication is also disclosed along with computer program products, arrangements and wireless communication devices corresponding to the methods.