Small Data Transmission Failure Reporting Mechanism
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing small data transmissions in 5G and beyond networks, particularly in reducing signalling overhead and power consumption without establishing a radio resource control connection.
Innovation Solution
The implementation of a terminal device and network element configuration that allows for the selection and reporting of small data transmission (SDT) procedure failures, enabling the network to optimize SDT configuration and minimize failures by gathering and analyzing failure reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radio resource control connection is established for data transmission, then transmission reliability is improved, but signalling overhead and power consumption increase
Solution Approach 1:
The patent segments the data transmission process into two distinct paths: small data transmission (SDT) for small packets that avoids full RRC connection establishment, and regular data transmission for larger packets that uses established RRC connections. This segmentation allows the system to optimize for different data sizes and requirements, reducing signalling overhead for small data while maintaining reliability for larger transmissions.
Solution Approach 2:
The patent changes the connection state parameter by introducing a new state where the terminal can transmit small data without transitioning to RRC_CONNECTED state. Instead, it uses RRC_INACTIVE state with pre-configured resources, fundamentally changing the parameter of connection establishment from binary (connected/not connected) to a three-state model that includes inactive with SDT capability.
2Reliability
If a radio resource control connection is established for data transmission, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
The patent segments the power consumption profile by creating distinct transmission modes: SDT mode for small data that consumes minimal power by avoiding connection establishment, and full connection mode for larger data. This allows the terminal to select the appropriate mode based on data size, significantly reducing power consumption for small data transmissions while maintaining reliability when needed.
Solution Approach 2:
The patent implements periodic monitoring and evaluation of SDT success, where the terminal assesses whether SDT is available and successful after each transmission attempt. This periodic action allows the system to adapt to changing network conditions and terminal states, ensuring reliable transmission while minimizing unnecessary power expenditure on failed SDT attempts.
3Device complexity
If small data transmission procedure is selected, then signalling overhead is reduced, but transmission failure rate increases
Solution Approach 1:
The patent implements a comprehensive feedback mechanism where the terminal monitors SDT success and failure, evaluates SDT availability, and reports outcomes to the network. This feedback loop allows the network to adjust SDT configurations and parameters based on actual transmission results, continuously improving success rates while maintaining low signalling overhead. The feedback includes both explicit failure reporting and implicit success indication through continued SDT usage.
Solution Approach 2:
The patent makes the SDT configuration dynamic by allowing the network to reconfigure SDT parameters based on terminal feedback and network conditions. The terminal can transition between SDT and full RRC connection modes dynamically based on transmission success, data size changes, and network availability, optimizing the balance between signalling overhead and transmission reliability in real-time.
Data Source
AI summary
Apparatus and method for failure reporting are provided. Solution including determining by a terminal device a failure in selecting small data transmission procedure for an uplink transmission; and transmitting to a network device, of a report including a small data transmission procedure type that the terminal device fails to select, and a reason for the small data transmission procedure selection failure.