Terminal Device Preconfigured Resource Small Data Transmission
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Solution Overview
Problem
In wireless communication, especially in 5G NR systems, terminal devices in an RRC_INACTIVE state face challenges in ensuring the successful transmission of the first message during preconfigured resource-based small data transmission (SDT), leading to potential power consumption and signaling overhead issues.
Innovation Solution
A method where a terminal device transmits a first message during the operation of a configured grant (CG)-SDT using a first timer, which includes an RRC message, and optionally continues transmission on either a configured grant (CG) resource or a dynamic grant (DG) resource without receiving correct reception feedback, ensuring the initial message is transmitted successfully.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device transmits the first message during configured grant (CG)-SDT without timer-based control, then the data transmission can be performed, but the successful transmission of the first message cannot be ensured
Solution Approach 1:
The patent applies preliminary action by configuring a first timer before the data transmission process. The timer is started when the terminal device selects CG-SDT and is used to control the transmission timing of the first message. This pre-configured timer ensures that the first message is transmitted within a specified duration, thereby ensuring reliable transmission while providing clear timing control mechanisms.
2Reliability
If the terminal device waits for correct reception feedback before continuing transmission, then transmission reliability is improved, but power consumption increases and signaling overhead is reduced
Solution Approach 1:
The patent implements feedback mechanisms where the network device provides reception feedback for the first message. The terminal device uses this feedback to determine whether to continue with subsequent transmission phases. This feedback loop ensures reliable transmission by confirming successful delivery of the first message before proceeding, while allowing the terminal to efficiently manage power consumption based on actual transmission needs.
3Use of energy by moving object
If the terminal device continues transmission on CG or DG resource without feedback, then power consumption is optimized, but transmission reliability may be compromised
Solution Approach 1:
The patent applies dynamics by allowing the terminal device to flexibly determine the transmission path based on feedback conditions. When the first message transmission is successful, the terminal can dynamically choose to continue on CG resource or switch to DG resource for subsequent transmissions. This dynamic adaptation optimizes power consumption by avoiding unnecessary retransmissions while maintaining transmission reliability through intelligent resource selection based on actual transmission outcomes.
Data Source
AI summary
The present disclosure provides a method for preconfigured resource-based small data transmission (SDT) and a terminal device. The method includes the following. A terminal device transmits a first message during operation of a first timer after selecting a configured grant (CG)-SDT, where the first message includes a 1st uplink message sent during the SDT, and the 1st uplink message at least includes a radio resource control (RRC) message.