SRS Trigger List Updates via MAC-CE for Adaptive 5G Scheduling

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Solution Overview

Problem

Existing 5G NR systems lack efficient mechanisms for dynamically updating sounding reference signal (SRS) resource set trigger lists, which can lead to suboptimal performance in channel estimation and resource allocation.

Innovation Solution

Utilizing medium access control (MAC-CE) to transmit an updated SRS resource set trigger list configuration, allowing for dynamic updates to SRS resource set trigger states, enabling more efficient SRS transmission and reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If SRS resource set trigger list configurations are updated using traditional RRC signaling, then configuration updates can be achieved, but the update speed and real-time adaptability are insufficient for dynamic wireless communication environments

Engineering Contradiction:

Improvereal-time adaptability of SRS resource set configurationsVSAvoidconfiguration update delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by enabling the SRS resource set trigger list configuration to be updated dynamically through MAC-CE signaling instead of static RRC signaling. The MAC-CE message format includes a trigger list field that can be updated in real-time based on channel conditions and scheduling requirements, allowing the configuration to adapt flexibly to changing wireless environments without requiring full RRC reconfiguration.

Inventive Principle:

Principle #15Dynamics

2Productivity

If MAC-CE is used to update trigger list configurations, then real-time adaptability improves, but the complexity of the control signaling increases

Engineering Contradiction:

Improveconfiguration update speedVSAvoidMAC-CE processing complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent extracts the trigger list update function from the complex RRC signaling layer and implements it independently through MAC-CE signaling. The MAC-CE message structure is simplified to contain only the essential trigger list field, separating the urgent configuration updates from the comprehensive RRC configuration management, thereby reducing processing complexity while maintaining update speed.

Inventive Principle:

Principle #2Taking out (Extraction)

3Measurement precision

If the trigger list is updated frequently to maintain precision, then channel estimation accuracy improves, but the overhead of control signaling increases

Engineering Contradiction:

Improvechannel estimation precisionVSAvoidcontrol signaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies partial action by updating only the necessary trigger list fields through MAC-CE signaling rather than performing full configuration updates. The MAC-CE message contains selectively updated trigger list entries based on current channel conditions and scheduling needs, reducing control signaling overhead while maintaining channel estimation precision for the most relevant SRS resource sets.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12627439B2Update aperiodic SRS trigger list using MAC-CE

Publication Date: 2026.05.12 QUALCOMM INC

AI summary

A configuration to allow for an SRS resource set trigger list configuration to be updated using MAC-CE. The apparatus transmits, to a UE, an SRS resource set trigger list configuration via RRC signaling. The apparatus transmits, to the UE, an updated trigger list value via MAC-CE to update the SRS resource set trigger list configuration. A trigger state of at least one SRS resource set is updated based on the updated trigger list value. The apparatus receives, from the UE, at least one SRS based on the updated SRS resource set trigger list configuration.