Small Data Transmission Fallback in Wireless RRC Inactive State
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing small data transmissions in RRC_INACTIVE state, leading to unnecessary power consumption and signaling overhead due to frequent state transitions for small and infrequent data packets.
Innovation Solution
The method involves a User Equipment (UE) initiating a 2-step Random Access (RA) procedure with UL data in RRC_INACTIVE state and switching to a 4-step RA procedure without UL data in response to specific conditions, such as poor radio conditions or network signaling, to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE frequently transitions between RRC states for small data transmissions, then data transmission capability is improved, but power consumption increases
Solution Approach 1:
The network pre-configures the UE with small data transmission parameters and resources while the UE is in RRC_INACTIVE state. This preliminary configuration allows the UE to transmit small data packets without transitioning to RRC_CONNECTED state, thereby maintaining data transmission capability while avoiding the power consumption associated with state transitions.
2Productivity
If the UE uses 2-step RA procedure with UL data in RRC_INACTIVE state, then transmission efficiency is improved, but reliability decreases under poor radio conditions
Solution Approach 1:
The UE dynamically selects between 2-step RA and 4-step RA procedures based on current radio conditions. When radio conditions are good, the UE uses the efficient 2-step RA procedure. When radio conditions deteriorate, the UE switches to the more reliable 4-step RA procedure, thereby adapting the transmission method to current conditions to maintain both efficiency and reliability.
Solution Approach 2:
The system implements feedback mechanisms where the UE monitors radio condition metrics and uses this feedback to determine whether to proceed with 2-step RA or fallback to 4-step RA. This feedback-driven decision-making ensures that transmission reliability is maintained by detecting poor conditions and switching procedures accordingly.
3Reliability
If the UE switches from 2-step RA to 4-step RA procedure, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The UE dynamically adjusts the RA procedure type based on measured radio conditions. The system maintains a threshold-based decision mechanism where 2-step RA is used when conditions exceed the threshold (maintaining low signaling overhead), and 4-step RA is used only when conditions fall below the threshold (ensuring reliability). This dynamic approach minimizes signaling overhead while maintaining reliability when necessary.
Data Source
AI summary
A method and device are disclosed from the perspective of a User Equipment (UE). In one embodiment, the method includes the UE initiating a 2-step Random Access (RA) procedure including Uplink (UL) data in RRC_INACTIVE state. The method further includes the UE switching from the 2-step RA procedure to a 4-step RA procedure not including the UL data in response to a condition.