CSI Payload Compression in Wireless Communication Systems
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Solution Overview
Problem
In wireless communication systems, there is a challenge in efficiently transmitting and receiving channel state information (CSI) due to resource allocation limitations, where the size of calculated CSI often exceeds the allocated resources, leading to performance degradation.
Innovation Solution
A method for CSI transmission in wireless communication systems involves receiving configuration information from a base station, calculating CSI using codebook parameters, and compressing it in the time or frequency domain to fit within allocated resources by reducing the payload size of specific parameters, ensuring that only the necessary information is transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI is calculated based on multiple codebook parameters to improve reporting accuracy, then measurement precision is improved, but the payload size exceeds the allocated resource capacity
Solution Approach 1:
The patent segments the CSI reporting process into two distinct parts: a first part containing essential CSI parameters (RI, CQI, PMI) and a second part containing additional parameters. This segmentation allows the system to prioritize transmission of critical information while conditionally including supplementary data based on resource availability, thereby resolving the contradiction between comprehensive reporting and resource constraints.
Solution Approach 2:
The patent dynamically changes parameters based on resource capacity. When resource capacity is sufficient, all codebook parameters are included in the second part for high-precision reporting. When resource capacity is limited, the system adjusts by reducing or omitting parameters in the second part, thereby adapting the payload size to match available resources while preserving essential information in the first part.
2Loss of information
If all calculated CSI parameters are transmitted to ensure complete information, then loss of information is minimized, but the resource allocation is exceeded
Solution Approach 1:
By dividing CSI into first part (essential parameters: RI, CQI, PMI) and second part (additional parameters), the patent ensures that critical information is always transmitted within resource constraints, while supplementary information is conditionally included when resources permit, thus minimizing information loss without exceeding capacity.
Solution Approach 2:
The patent implements partial transmission strategy where the first part of CSI is always transmitted (ensuring minimum information completeness), and the second part is transmitted partially or fully depending on resource availability. This approach prevents resource overflow while maintaining essential information flow.
3Productivity
If CSI payload size is reduced to fit allocated resources, then resource utilization is improved, but measurement precision may deteriorate
Solution Approach 1:
The patent structures CSI into hierarchical parts where the first part contains high-priority parameters essential for basic channel state assessment, and the second part contains lower-priority parameters for enhanced precision. This hierarchy ensures that resource utilization is optimized by transmitting only essential data when resources are limited, while maintaining the option to include additional precision-enhancing parameters when resources are abundant.
Solution Approach 2:
The patent applies different quality levels to different parts of CSI based on resource conditions. When resources are constrained, the system transmits high-quality essential information (first part) with reduced supplementary information (second part). When resources are abundant, the system enhances overall quality by including complete parameter sets, thereby adapting local quality characteristics to resource availability.
Data Source
AI summary
The present invention relates to a method whereby user equipment (UE) transmits channel state information (CSI) in a wireless communication system and to a device therefor. According to the present invention, a terminal receives configuration information for CSI reporting from a base station and receives a reference signal from the base station on the basis of the configuration information. The terminal may receive downlink control information (DCI) via a physical downlink control channel (PDCCH), calculate CSI about a particular channel on the basis of the configuration information and the DCI, and report same to the base station.