Terminal CSI Reporting Mode Selection for Overhead Reduction

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Solution Overview

Problem

Current CSI reporting methods in MIMO wireless communication systems are inflexible and result in excessively high overheads due to excessive candidate measurement reference signal resources, limiting resource utilization and spectral efficiency.

Innovation Solution

A CSI sending method where a terminal selects a target CSI process and sets a CSI reporting mode, either at a first-granularity (less than a threshold) or second-granularity (greater than or equal to a threshold), and sends corresponding CSI, with optional notification messages to the base station, allowing adaptive feedback based on channel quality measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a CSI reporting mode specific to each set of measurement reference signal resources is configured by the base station, then the terminal can report all CSI corresponding to multiple sets of measurement reference signal resources, but the required CSI report overheads become excessively high

Engineering Contradiction:

ImproveCSI measurement precisionVSAvoidCSI report overheads

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent extracts only the necessary CSI information for reporting by introducing a CSI reporting mode indicator that selects from multiple predefined reporting modes. Instead of reporting all CSI parameters for every measurement reference signal resource, the system extracts and reports only the most relevant CSI parameters based on the selected reporting mode, thereby reducing overhead while maintaining measurement precision.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameter representation by introducing a CSI reporting mode indicator that selects from multiple predefined reporting modes with different parameter sets. Each reporting mode corresponds to different combinations of CSI parameters (such as CQI, PMI, RI) and different reporting granularities, allowing the system to adapt the reported parameters according to channel conditions and resource constraints.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If multiple sets of measurement reference signal resources are configured for each terminal, then the base station can manage and coordinate precoding matrices, but the flexibility of the system becomes insufficient

Engineering Contradiction:

Improveprecoding matrix coordinationVSAvoidsystem flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent introduces dynamic adaptability by allowing the terminal to select from multiple CSI reporting modes based on current channel conditions and requirements. The CSI reporting mode indicator enables the system to dynamically switch between different reporting configurations, making the system flexible enough to adapt to varying channel states while maintaining reliable precoding matrix coordination through the structured reporting framework.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent creates a universal CSI reporting framework where a single CSI reporting mode indicator can select from multiple predefined reporting modes, each suitable for different scenarios. This multi-functional approach allows the same reporting mechanism to handle various CSI reporting requirements (different granularities, different parameter sets) without requiring separate dedicated mechanisms for each case, thereby improving system flexibility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If the terminal reports all CSI corresponding to multiple sets of measurement reference signal resources, then the base station can perform downlink scheduling, but the resource utilization and spectral efficiency are limited

Engineering Contradiction:

Improvedownlink scheduling capabilityVSAvoidresource utilization efficiency

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The patent extracts only the essential CSI parameters needed for downlink scheduling by selecting appropriate reporting modes. Instead of transmitting all available CSI data, the system extracts and reports only the parameters that are most relevant for scheduling decisions (such as CQI for MCS selection, PMI for precoding), thereby reducing overhead and improving resource utilization while maintaining scheduling capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10660075B2Channel state information CSI sending method, channel state information CSI receiving method, terminal, and base station

Publication Date: 2020.05.19 HONOR DEVICE CO LTD

AI summary

Embodiments of the present disclosure provide a channel state information (CSI) sending method, a CSI receiving method, a terminal, and a base station. The terminal selects a target CSI process from N CSI processes. The terminal sets a CSI reporting mode corresponding to the target CSI process, and sends, based on the CSI reporting mode, a CSI corresponding to the CSI process. The terminal can set a CSI reporting mode corresponding to a CSI process, and send, based on the set CSI reporting mode, a CSI corresponding to the CSI process. However, in the prior art, only the base station configures a CSI reporting mode corresponding to each CSI process. Therefore, flexibility is increased.