CSI Reporting with CQI Thresholds for Wireless Energy Saving
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Solution Overview
Problem
The increasing demand for network support of various services and user equipment (UEs) has led to a growing need for UE and network energy saving, particularly in wireless communication systems, while maintaining efficient data throughput and reliability.
Innovation Solution
A method and system for transmitting channel state information (CSI) reports with power control offsets, where CSI reports are configured with sub-configurations and thresholds to selectively include channel quality indicator (CQI) values above a certain threshold, reducing unnecessary signaling and conserving energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CSI reports are transmitted frequently and comprehensively to maintain accurate channel state information, then communication reliability and data throughput are improved, but network energy consumption and signaling overhead increase
Solution Approach 1:
The patent changes the parameter of CSI report transmission by introducing a CQI threshold that dynamically controls what information is reported. When channel conditions are good (CQI above threshold), detailed CSI reports are transmitted. When conditions deteriorate (CQI below threshold), reporting is reduced or stopped. This parameter-based control resolves the contradiction by adapting reporting frequency and detail to actual channel conditions, maintaining reliability when needed while saving energy during good conditions.
Solution Approach 2:
The patent applies partial action by selectively reporting only the most relevant CSI information based on CQI thresholds. Instead of always transmitting complete CSI reports, the system transmits partial information (only when CQI exceeds threshold) or no information (when threshold not met). This partial reporting strategy maintains sufficient communication reliability while significantly reducing energy consumption and signaling overhead.
2Measurement precision
If CSI report configuration includes multiple sub-configurations with different CSI-RS resources and power control offsets, then channel measurement accuracy is improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the CSI report configuration into multiple sub-configurations, each associated with specific CSI-RS resources and power control offsets. This segmentation allows the UE to measure different channel conditions using different reference signals and apply appropriate power control adjustments. The segmented approach improves measurement accuracy by providing multiple measurement opportunities while managing complexity through structured organization of the sub-configurations.
Solution Approach 2:
The patent introduces dynamic selection among multiple sub-configurations based on channel conditions. The UE dynamically determines which sub-configurations to use for measurement and reporting based on current channel quality and CQI thresholds. This dynamic approach allows the system to adapt measurement complexity to actual needs, using multiple sub-configurations when accuracy is critical while simplifying operations when conditions permit.
3Loss of information
If all determined CQI values are included in CSI reports, then complete channel quality information is provided to the base station, but signaling overhead and transmission resources increase
Solution Approach 1:
The patent extracts only the necessary CQI values from the full set of determined CQI values based on comparison with a threshold. Instead of including all CQI values in the CSI report, the system extracts and transmits only those values that exceed the threshold or are most relevant for current channel conditions. This extraction approach maintains essential channel quality information completeness while significantly reducing signaling overhead and transmission resource consumption.
Data Source
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AI summary
A method of transmitting a channel state information (CSI) report by a user equipment (UE) in a wireless communication system includes receiving a CSI report configuration including a plurality of sub-configurations, each of the plurality of sub-configurations including at least one CSI-reference signal (CSI-RS) resource and a power control offset (PCO) value related to the at least one CSI-RS resource, determining a plurality of channel quality indicator (CQI) values based on the plurality of sub-configurations, and transmitting the CSI report based on the plurality of CQI values, wherein the CSI report configuration includes a CQI threshold, and based on presence of a CQI value greater than the CQI threshold from among the plurality of CQI values, the CSI report includes the CQI value greater than the CQI threshold.