UE SCG Configuration Handling for Wireless Networks
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Solution Overview
Problem
In wireless communications networks, frequent switching between multiple Secondary Cell Groups (SCGs) leads to unnecessary load on both the User Equipment (UE) and the network, as the Master Node (MN) or current Secondary Node (SN) may trigger SN changes when the UE enters better coverage conditions, resulting in repeated context reacquisition and capability coordination.
Innovation Solution
The UE handles multiple SCG configurations by receiving configurations from network nodes indicating whether each SCG should be active or inactive, and decides to store or activate them accordingly, allowing for reduced signaling and faster switching between SCGs by maintaining suspended configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MN or current SN triggers SN change when the UE enters better coverage conditions, then the UE can connect to a more suitable Secondary Node, but frequent switching between multiple SCGs leads to unnecessary load on both the UE and the network
Solution Approach 1:
The network configures the UE with multiple SCG configurations in advance (before switching is needed). Each SCG configuration includes complete secondary node information and parameters. When switching is triggered, the UE can immediately activate a pre-configured SCG without performing full setup procedures, thereby reducing switching frequency and network load while maintaining connection quality.
2Adaptability or versatility
If the UE performs frequent SN changes to maintain optimal connection, then the UE can adapt to changing coverage conditions, but repeated context reacquisition and capability coordination increases signaling overhead
Solution Approach 1:
Multiple SCG configurations are provided to the UE in advance through RRC signaling from the MN. Each configuration contains complete secondary node parameters and capabilities. When the UE needs to switch SCGs due to coverage changes, it activates a pre-configured SCG without requiring repeated context reacquisition or capability coordination signaling, thus reducing signaling overhead while maintaining adaptability to coverage conditions.
3Speed
If the UE stores multiple SCG configurations, then fast switching between SCGs is enabled, but memory requirements and configuration management complexity increase
Solution Approach 1:
The network provides multiple complete SCG configurations to the UE in advance through RRC signaling. Each configuration is self-contained with all necessary parameters. The UE stores these configurations and can quickly activate them when needed, achieving fast switching without requiring complex real-time configuration generation or management, as the heavy configuration work is done preliminarily by the network.
Data Source
AI summary
A method performed by a User Equipment (UE) for handling multiple Secondary Cell Group (SCG) configurations in a wireless communications network is provided.The UE receives (1201) from a network node:a first SCG configuration of a first Secondary Node, SN, and an indication of whether or not the first SCG is to be configured as active or inactive, anda second SCG configuration of a second SN, and an indication of whether or not the second SCG is to be configured as active or inactive. The multiple SCG configurations comprises at least the first SCG configuration and the second SCG configuration.The UE then decides (1202) whether to handle each respective SCG configuration out of the multiple SCG configurations according to a first option or a second option based on its respective indication.The first option comprises when one or more out of the respective multiple SCG configurations are indicated to be configured as inactive, storing (1203) that particular SCG configuration.The second option comprises when one or more out of the respective multiple SCG configurations are indicated to be configured as active, activating (1204) that particular SCG configuration in the UE.