RRC Inactive Small Data Transmission With CG-RA Switching
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Solution Overview
Problem
Current 5G mobile communication systems face challenges in efficiently managing data transmission in the RRC_INACTIVE state, particularly when synchronization signal blocks with sufficient reference signal received strength are not available, leading to inefficiencies in small data transmission procedures.
Innovation Solution
A method and system for data transmission in RRC_INACTIVE that includes receiving a radio resource control release message with suspend configuration and configured grant-small data transmission information, initiating a timer for synchronization, and transitioning to a random access-small data transmission procedure if synchronization signal blocks with adequate strength are unavailable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal attempts to perform CG-SDT using configured grant occasions, then data transmission efficiency is improved, but transmission reliability deteriorates when synchronization signal blocks with sufficient RSRP are unavailable
Solution Approach 1:
The patent implements dynamic switching between CG-SDT and RA-SDT modes based on real-time availability of suitable SSBs. The terminal monitors SSB availability and dynamically transitions between configured grant-based and random access-based small data transmission procedures, allowing the system to adapt to changing radio conditions and maintain both efficiency and reliability.
Solution Approach 2:
The patent changes the operational parameter from fixed CG-SDT mode to a flexible mode that can switch between CG-SDT and RA-SDT based on SSB RSRP conditions. This parameter change enables the terminal to select the appropriate transmission method according to current network conditions, resolving the contradiction between efficiency and reliability.
2Ease of operation
If the terminal strictly follows CG-SDT procedure, then procedure simplicity is maintained, but adaptability deteriorates when CG occasions with adequate RSRP are unavailable
Solution Approach 1:
The patent introduces dynamic adaptability while maintaining procedural simplicity through clear decision criteria. The terminal simply needs to check whether suitable SSBs are available and switch between CG-SDT and RA-SDT accordingly. This dynamic approach preserves ease of operation while significantly improving adaptability to varying network conditions.
Solution Approach 2:
The patent uses the availability of suitable SSBs as an intermediary condition that mediates between the simple CG-SDT procedure and the need for network condition adaptability. When SSBs are available, the simple CG-SDT procedure is used; when not available, the system transitions to RA-SDT, thus maintaining both simplicity and adaptability through a clear intermediary decision point.
3Stability of the object's composition
If the terminal waits for CG-SDT opportunity, then time alignment is maintained, but time loss increases when transitioning to RA-SDT due to random access procedure
Solution Approach 1:
The patent applies preliminary action by having the terminal prepare and monitor SSB availability in advance while in RRC_INACTIVE state. The terminal continuously checks for suitable SSBs before initiating data transmission, so when CG-SDT becomes available, the terminal can immediately proceed without waiting or experiencing significant transition delays. This preliminary monitoring reduces time loss during mode transitions.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a terminal in a wireless communication system is provided. The method includes receiving a radio resource control (RRC) release message including suspend configuration information and configured grant-small data transmission (CG-SDT) configuration information, starting a timer related to a time alignment (TA) for CG-SDT based on the CG-SDT configuration information, identifying that criteria for a small data transmission (SDT) procedure is met, and in case that any configured grant (CG) occasion corresponding to a synchronization signal block (SSB) with a reference signal received strength (RSRP) above a threshold value is not available while the timer related to the TA for CG-SDT is running, and criteria for a random access-small data transmission (RA-SDT) procedure is met, performing the RA-SDT procedure.