SDT Failure Reporting for 5G RRC Inactive Reliability

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Solution Overview

Problem

In the 5G New Radio (NR) system, User Equipment (UE) in the RRC_INACTIVE state experiences unnecessary power consumption and signaling overhead due to the lack of supported data transmission, which is improved in Rel-17 but still requires further enhancement for Small Data Transmission (SDT) reliability.

Innovation Solution

An SDT failure reporting method is introduced, where a terminal device determines and reports SDT failure information, enabling the network device to assess transmission results and improve scheduling, thereby enhancing transmission reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a UE in RRC_INACTIVE state performs SDT using random access procedure or pre-configured resources, then data transmission capability is improved, but transmission reliability deteriorates due to lack of failure reporting mechanism

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidtransmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the terminal device detects SDT failures and reports failure information to the network device. This feedback loop enables the network to identify transmission failures and take appropriate actions, thereby improving transmission reliability while maintaining the SDT capability in RRC_INACTIVE state.

Inventive Principle:

Principle #23Feedback

2Reliability

If a UE frequently resumes connection for data transmission in RRC_INACTIVE state, then data transmission reliability is improved, but power consumption increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent enables the terminal device to autonomously detect SDT failures and report them without requiring full connection resumption. This self-service capability allows the device to maintain reliability through failure reporting while avoiding the high power consumption associated with frequent connection resumptions.

Inventive Principle:

Principle #25Self-service

3Reliability

If SDT failure reporting mechanism is implemented, then transmission reliability is improved, but signaling overhead increases

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent extracts only the essential failure information from the SDT failure event and reports it to the network device. By taking out and reporting only the critical failure indication rather than complete transmission details, the signaling overhead is minimized while still achieving improved transmission reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20240080699A1SDT failure reporting method, terminal device, and network device

Publication Date: 2024.03.07 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

A Small Data Transmission (SDT) failure reporting method, a terminal device, and a network device are provided. Whether a SDT failure occurs is determined. SDT failure information is reported when the SDT failure occurs. With the above technical solutions, by determining whether SDT failure occurs and reporting SDT failure information when the SDT failure occurs, the network device can know the SDT transmission result, which facilitates the network device's transmission scheduling for SDT and improves the transmission reliability of SDT.