CSI Feedback Overhead Reduction via Assumption-Based Reporting

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Solution Overview

Problem

Current CSI reporting methods require a large amount of overhead, leading to increased uplink transmission latency and downlink transmission performance degradation, especially when supporting multiple transmission solutions.

Innovation Solution

The method involves a terminal device determining second CSI information based on first assumption information, where the CSI is divided into two parts: the first part contains assumption information, and the second part includes PMI and/or CQI. This allows flexible reporting of CSI according to the indicated transmission solution, reducing feedback overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple CSI reporting configurations are configured to support multiple transmission solutions, then transmission solution versatility is improved, but CSI feedback overhead increases

Engineering Contradiction:

Improvetransmission solution versatilityVSAvoidCSI feedback overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent merges multiple CSI reporting configurations into a single unified configuration. Instead of configuring separate CSI reporting for each transmission solution, the network configures one CSI reporting configuration that can adapt to multiple transmission solutions through assumption information, thereby reducing the quantity of CSI feedback while maintaining support for multiple transmission solutions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single CSI reporting configuration is designed to serve multiple transmission solutions universally. By incorporating assumption information that indicates different measurement assumptions, the same CSI reporting configuration can be used across different transmission scenarios, eliminating the need for multiple specialized configurations and reducing overall feedback overhead.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple CSI reporting configurations are configured to support multiple transmission solutions, then transmission solution versatility is improved, but uplink transmission performance deteriorates

Engineering Contradiction:

Improvetransmission solution versatilityVSAvoiduplink transmission performance

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

By merging multiple CSI reporting configurations into one, the uplink resources required for CSI feedback are consolidated. This reduces the total uplink overhead and improves uplink transmission performance, while the unified configuration still supports multiple transmission solutions through its adaptive assumption information mechanism.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If multiple CSI reporting configurations are configured to support multiple transmission solutions, then transmission solution versatility is improved, but downlink transmission performance deteriorates

Engineering Contradiction:

Improvetransmission solution versatilityVSAvoiddownlink transmission performance

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges multiple CSI reporting configurations into a single configuration that provides comprehensive channel state information applicable to multiple transmission solutions. This enables the network to make more informed downlink scheduling decisions with a single CSI feedback, improving downlink transmission performance while maintaining versatility.

Inventive Principle:

Principle #5Merging (Combining)

4Adaptability or versatility

If assumption information is included in CSI Part 1 to indicate measurement assumptions, then transmission solution flexibility is improved, but CSI feedback overhead increases

Engineering Contradiction:

Improvetransmission solution flexibilityVSAvoidCSI feedback overhead

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The assumption information in CSI Part 1 is designed to be dynamic and compact. Rather than reporting full CSI for multiple transmission solutions, the terminal reports concise assumption information that dynamically indicates which measurement assumption applies, allowing the network to interpret the CSI feedback according to the indicated transmission solution without requiring extensive additional feedback.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4192087B1Method and apparatus for reporting and receiving CSI, and terminal device and network device

Publication Date: 2025.04.23 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

Figure 1~2A
Figure 2B~2C
Figure 3~4

AI summary

Provided in the embodiments of the present application are a method and apparatus for reporting and receiving CSI, and a terminal device and a network device. The method comprises: a terminal device determining second information in a second CSI portion according to first information in a first CSI portion, wherein the first information is assumption information or two RIs, the assumption information is used for indicating a transmission assumption or a measurement assumption, on which CSI reporting is based, the two RIs are obtained by means of measurement based on different measurement resources, and the second information comprises a PMI and/or a CQI; and the terminal device reporting the CSI, wherein the CSI comprises the first CSI portion and the second CSI portion.