Non-SDT DRB Handling in RRC Inactive State
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling non-SDT dedicated radio bearers (DRBs) during an SDT procedure, particularly in 5G NR systems, leading to delays and increased resource consumption when transitioning between RRC states.
Innovation Solution
A method for non-SDT DRB handling where a user equipment (UE) determines the availability of non-SDT data while in an RRC inactive state and transmits non-SDT data arrival information during an SDT procedure, based on conditions such as arrival time and amount of data, allowing for optimized DRB management without triggering a legacy RRC resume procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a legacy RRC resume procedure is triggered for non-SDT data transmission, then the data can be transmitted reliably, but delays and resource consumption increase
Solution Approach 1:
The patent segments data transmission into two distinct paths: SDT procedure for small data transmissions and legacy RRC resume procedure for larger or non-SDT data. By dividing the transmission pathway based on data characteristics, the system achieves both low latency for small packets and reliability for larger transmissions, resolving the contradiction between speed and reliability
Solution Approach 2:
The patent implements dynamic procedure selection where the UE can adaptively choose between SDT and legacy RRC resume procedures based on real-time conditions such as data size, data type, and network configuration. This dynamic adaptation allows the system to optimize between latency and reliability depending on the specific transmission scenario
2Reliability
If a legacy RRC resume procedure is triggered for non-SDT data transmission, then complete data handling is achieved, but resource consumption increases
Solution Approach 1:
The patent segments energy consumption based on transmission type by maintaining separate SDT and legacy RRC resume pathways. Small data transmissions use the energy-efficient SDT path while larger transmissions use the comprehensive legacy path only when necessary, significantly reducing overall UE energy consumption while maintaining handling completeness
Solution Approach 2:
The patent changes the operational parameters of the UE by configuring SDT-specific parameters such as pre-configured uplink resources, simplified random access procedures, and optimized data formats. These parameter changes enable low-energy transmission for small packets, resolving the contradiction between complete handling and energy consumption
3Loss of time
If SDT procedure is used for non-SDT data, then delays are reduced, but data transmission reliability may be compromised
Solution Approach 1:
The patent applies local quality by optimizing the SDT procedure specifically for small data transmissions where low latency is critical, while maintaining the legacy RRC resume procedure for larger or reliability-critical data. Each pathway is locally optimized for its intended use case, achieving both speed where needed and reliability where required
Solution Approach 2:
The patent introduces an intermediary decision-making mechanism (the procedure selection logic in the UE) that determines whether to use SDT or legacy RRC resume based on data characteristics. This intermediary ensures that the appropriate procedure is selected, preventing reliability compromise while maintaining delay reduction benefits
Data Source
AI summary
Apparatuses, systems, and methods for non-small data transmission (non-SDT) dedicated radio bearer (DRB) handling while in a radio resource control (RRC) inactive state. A wireless device may determine, while operating in the RRC inactive state, that non-SDT data is available for transmission on a non-SDT DRB and determine, based on one or more conditions, to transmit, to a base station, non-SDT data arrival information during an SDT procedure. The one or more conditions may be associated with arrival time of the non-SDT data and/or an amount of non-SDT data to be transmitted. The arrival time may be relative to arrival of SDT data, initiation of an SDT procedure, and/or initiation of a subsequent transmission period of an SDT procedure.