Small Data Transmission Failure Logging in RRC Inactive State
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Solution Overview
Problem
Current 5G mobile communication systems lack efficient logging and reporting mechanisms for small data transmission in RRC_INACTIVE state, hindering network optimization and reliability.
Innovation Solution
A method for user equipment (UE) in a wireless communication system to initiate a small data transmission procedure in an RRC inactive state, obtain reports for log connection failures or small data transmission procedure failures based on an expiry of an SDT timer, and transmit these reports to a base station upon entering an RRC connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small data transmission is performed in RRC_INACTIVE state, then transmission efficiency is improved, but reliability of data transmission deteriorates due to lack of logging and reporting mechanisms
Solution Approach 1:
The patent implements preliminary logging of small data transmission attempts and failure causes while in RRC_INACTIVE state. The UE stores transmission information including failure causes in a buffer before transitioning to RRC_CONNECTED state, enabling subsequent reporting and network optimization without requiring real-time monitoring during inactive state.
Solution Approach 2:
The patent establishes a feedback mechanism where the UE reports logged small data transmission failure information to the base station after transitioning to RRC_CONNECTED state. This feedback enables the network to identify transmission failures, analyze failure causes, and optimize small data transmission parameters for improved reliability while maintaining the efficiency benefits of inactive state transmission.
2Reliability
If logging and reporting mechanisms are implemented for small data transmission, then network optimization is improved, but device complexity increases
Solution Approach 1:
The patent implements logging and reporting functionality specifically for small data transmission failures in RRC_INACTIVE state, rather than implementing comprehensive logging for all transmission types and states. The UE selectively logs only small data transmission attempts and stores failure cause information, minimizing the complexity overhead while providing targeted insights for network optimization.
Solution Approach 2:
The patent extracts and stores only the essential failure cause information and transmission parameters needed for network optimization, rather than logging complete transmission details. By selectingively storing failure causes such as random access failures, scheduling request failures, and uplink data transmission failures, the system achieves network optimization capability with minimal additional device complexity.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment, the method comprises initiating a small data transmission (SDT) procedure, in a radio resource control (RRC) inactive state, obtaining a report for a log connection failure or an SDT procedure failure, based on an expiry of an SDT timer, wherein the report for the log connection failure includes information indicating that the report is for SDT and in case that the UE enters an RRC connected state, and transmitting the report to a base station, based on a request for the report from the base station.