Multiple SCG Configurations for Faster RRC Inactive DC Resumption
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Solution Overview
Problem
Existing 5G NR systems face inefficiencies in resuming dual connectivity (DC) operations after transitioning to a radio resource control (RRC) inactive state due to the lack of efficient management of secondary cell group (SCG) configurations.
Innovation Solution
A user equipment (UE) is configured to store multiple SCG configurations during the RRC inactive state, allowing for efficient resumption of DC operations by utilizing one of the stored configurations upon reconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE stores multiple SCG configurations during RRC inactive state, then the resumption of DC operations becomes rapid and efficient, but the device complexity and memory requirements increase
Solution Approach 1:
The network node performs preliminary actions by determining and providing multiple candidate target SCG configurations to the UE before the UE transitions to RRC inactive state. This allows the UE to have pre-configured options ready for rapid resumption without needing to perform complex configuration procedures after becoming inactive, thus reducing resumption latency while managing complexity through network-side preparation.
Solution Approach 2:
The patent changes the parameter of SCG configuration from a single static configuration to multiple candidate configurations with different validity times. This allows the system to optimize resumption performance by selecting from multiple pre-configured options rather than performing full reconfiguration, balancing the trade-off between storage complexity and resumption speed.
2Reliability
If the network node provides multiple candidate target SCG configurations with validity times, then the adaptability and reliability of DC resumption improve, but the signaling overhead and network complexity increase
Solution Approach 1:
The network node performs preliminary actions by determining and providing multiple candidate target SCG configurations to the UE before the UE transitions to RRC inactive state. This allows the UE to have pre-configured options ready for rapid resumption without needing to perform complex configuration procedures after becoming inactive, thus reducing resumption latency while managing complexity through network-side preparation.
Solution Approach 2:
The system implements feedback mechanisms where the UE measures candidate target PSCells during RRC inactive state and reports measurements to the network. The network uses this feedback to determine which configuration to activate, improving reliability by making informed decisions based on actual radio conditions rather than blindly selecting from pre-configured options.
3Measurement precision
If the UE performs measurements for candidate target PSCells during RRC inactive state, then the accuracy of configuration selection improves, but the energy consumption and processing load increase
Solution Approach 1:
The UE performs partial measurements during RRC inactive state - specifically measuring candidate target PSCells associated with provided SCG configurations - rather than performing exhaustive measurements of all possible cells. This partial action provides sufficient accuracy for configuration selection while limiting energy consumption and processing load to what is necessary for making informed resumption decisions.
Data Source
AI summary
Method and apparatus to configure a UE to store multiple SCG configurations while in a RRC inactive state. The apparatus requests, from each of one or more target nodes, a validity time for each of one or more candidate target SCG configurations for a UE. The apparatus transitions the UE to a RRC inactive state. The apparatus indicates the validity time for each of the one or more candidate target SCG configurations for each of the one or more target nodes.