Managing SDT Configurations for Small Data Transmission Latency

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Solution Overview

Problem

There is a challenge in managing Small Data Transmission (SDT) configurations for user equipment (UE) during state transitions and after completing SDT operations, which can lead to data communication latency and network inefficiencies.

Innovation Solution

The UE manages SDT configurations by releasing or retaining them based on messages received from the radio access network (RAN), such as RRC release or resume messages, to optimize configuration management during state transitions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the UE retains SDT configuration during state transitions, then data communication efficiency is improved, but configuration management complexity increases

Engineering Contradiction:

Improvedata communication efficiencyVSAvoidconfiguration management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The UE autonomously determines whether to release or retain SDT configuration by evaluating its own state transition context and communication needs, without requiring explicit network instructions for each decision. The UE serves itself by making intelligent configuration management decisions based on predefined criteria.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The SDT configuration management is made dynamic by allowing the UE to adaptively retain or release configurations based on real-time state transitions and communication requirements, rather than using a static release-all-approach. This enables flexible optimization of data communication efficiency.

Inventive Principle:

Principle #15Dynamics

2Reliability

If the UE releases SDT configuration after completing SDT operation, then network resources are optimized, but data communication latency increases

Engineering Contradiction:

Improvenetwork resource optimizationVSAvoiddata communication latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The UE performs preliminary evaluation of its SDT operation status and state transition context before making configuration release decisions. By anticipating future communication needs and evaluating current state in advance, the UE avoids premature configuration release that would cause latency, while still optimizing network resources.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If the UE uses RRC release message to transition to inactive state, then connection management is simplified, but SDT configuration management becomes ambiguous

Engineering Contradiction:

Improveconnection management simplicityVSAvoidSDT configuration management ambiguity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The UE implements feedback mechanisms to monitor its own SDT configuration status and state transitions. By continuously evaluating whether SDT configuration should be retained or released based on current context, the UE resolves the ambiguity created by RRC release messages while maintaining simplified connection management.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250168919A1Managing radio configurations for small data transmission

Publication Date: 2025.05.22 GOOGLE LLC

AI summary

In a method performed by a UE, a first message including an SDT configuration is received from a RAN when the UE operates in an RRC inactive state. The SDT configuration is for use by the UE when communicating with the RAN while the UE operates in the RRC inactive state. The method also includes, after receiving the first message, and while the UE is in the inactive state, receiving from the RAN an RRC release message, and, when the RRC release message includes a release indication for releasing the SDT configuration, releasing the SDT configuration.