Cross-DRX CSI Reporting Using Shared PUCCH Resources

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies in cross-discontinuous reception (DRX) group channel state information (CSI) reporting, particularly when multiple DRX configurations are used across different frequency ranges, leading to wasted resources and suboptimal power consumption due to independent DRX group active times.

Innovation Solution

A method and apparatus for a user equipment (UE) to determine whether CSI associated with a secondary DRX group can be transmitted outside the active time of a primary DRX group, using a flag to enable or disable this transmission, and to multiplex CSI with uplink control information (UCI) during non-active times of the primary DRX group.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If independent DRX group active times are used for multiple DRX configurations, then power management flexibility is improved, but resource utilization deteriorates due to wasted transmission opportunities

Engineering Contradiction:

Improvepower consumptionVSAvoidresource utilization

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent merges CSI reporting from multiple DRX groups into a unified reporting mechanism. Specifically, CSI for both primary and secondary DRX groups is reported on the same PUCCH resources associated with the primary DRX group, allowing consolidated uplink transmissions that utilize available resources efficiently while maintaining independent DRX active times for power management.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The PUCCH resources associated with the primary DRX group are made universal to carry CSI for both primary and secondary DRX groups. This multi-functional use of PUCCH resources allows the system to maintain separate DRX configurations for power management while utilizing a common reporting channel to improve resource utilization.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If CSI for secondary DRX group is reported only during primary DRX active time, then resource utilization is improved, but power management flexibility deteriorates

Engineering Contradiction:

Improveresource utilizationVSAvoidpower management flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent segments the CSI reporting function into two independent parts: primary DRX group CSI reporting and secondary DRX group CSI reporting. Both segments are transmitted on the same PUCCH resources during primary DRX active time, allowing the system to maintain independent DRX configurations while achieving efficient resource utilization through unified reporting.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system prepares PUCCH resources in advance during primary DRX active time to accommodate CSI reporting from both DRX groups. This preliminary preparation ensures that when secondary DRX group needs to report CSI, the resources are already allocated and ready, eliminating the need to restrict reporting to specific time windows.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If multiple independent DRX configurations are used, then adaptability for different frequency ranges is improved, but device complexity increases

Engineering Contradiction:

Improvefrequency range adaptabilityVSAvoidDRX configuration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the complexity of multi-DRX group CSI reporting by separating the reporting mechanism from the DRX configuration management. The PUCCH resources are extracted and dedicated to carry CSI from multiple DRX groups, simplifying the overall system by creating a clear division between DRX configuration (handled independently) and CSI reporting (handled through unified PUCCH resources).

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP4128898B1Cross-discontinuous reception group channel state information reporting

Publication Date: 2026.04.22 QUALCOMM INC

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AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine whether a flag is enabled or is disabled, the flag indicating whether channel state information (CSI) associated with a secondary discontinuous reception (DRX) group is permitted to be transmitted outside of an active time associated with a primary DRX group. The UE may selectively transmit the CSI associated with the secondary DRX group in an uplink communication associated with the primary DRX group based at least in part on whether the flag is enabled or is disabled. Numerous other aspects are provided.