Terminal Device CSI Reporting Across Multiple Carriers

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In dual connectivity (DC)/carrier aggregation (CA) enhancements, the existing methods for reporting channel state information (CSI) based on a physical uplink shared channel (PUSCH) are inadequate when one downlink control information (DCI) schedules PUSCHs across multiple carriers.

Innovation Solution

A wireless communication method where a terminal device receives first control information scheduling multiple uplink channels carried by different carriers, determines the uplink channel to carry CSI, and transmits this CSI over the identified uplink channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If one DCI schedules PUSCHs on multiple carriers in DC/CA enhancement, then the system capacity and connectivity are improved, but the CSI reporting mechanism becomes complex and inadequate

Engineering Contradiction:

ImproveDC/CA enhancement capabilityVSAvoidCSI reporting mechanism complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the CSI reporting process by associating specific PUSCH channels with CSI reporting functions. When multiple PUSCHs are scheduled across different carriers, the system identifies which PUSCH(s) should carry CSI based on predefined rules or indicators in the DCI, thereby managing complexity through structured segmentation of the reporting task.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces control information fields within the DCI as intermediaries that indicate which PUSCH channel(s) should be used for CSI reporting. This intermediary mechanism allows the system to manage multi-carrier CSI reporting without requiring complex new protocols, as the indication is embedded within existing DCI structures.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If CSI is reported on PUSCH channels scheduled by one DCI across multiple carriers, then the communication reliability is improved, but the determination of which channel to use becomes ambiguous

Engineering Contradiction:

ImproveCSI reporting reliabilityVSAvoidChannel selection ambiguity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies local quality by assigning specific characteristics to different PUSCH channels based on their carrier associations. The system determines which PUSCH should carry CSI by evaluating local properties such as carrier type, channel priority, or specific indicators within the DCI, making the selection process deterministic rather than ambiguous.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of having the terminal device arbitrarily select a PUSCH channel for CSI reporting, the patent inverts the approach by having the network device explicitly indicate through the DCI which PUSCH channel(s) should be used. This inversion of the selection responsibility eliminates ambiguity and ensures reliable CSI reporting.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS20250038815A1Wireless communication methods, terminal devices and network devices

Publication Date: 2025.01.30 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A wireless communication method includes: receiving, by a terminal device, first control information, where the first control information is used to schedule a plurality of uplink channels, and different uplink channels of the plurality of uplink channels are carried by different carriers; and determining, by the terminal device, at least one uplink channel from the plurality of uplink channels, where the at least one uplink channel is at least used to carry CSI; and transmitting at least, by the terminal device, the at least one uplink channel, where the at least one uplink channel carries the CSI to be transmitted.