SCG Restoration via Mandatory Sync Trigger in Dual Connectivity
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Solution Overview
Problem
Existing solutions face challenges in properly restoring, releasing, or reconfiguring a stored Secondary Cell Group (SCG) configuration during connection resumption in dual connectivity scenarios, leading to issues with synchronization and random access.
Innovation Solution
The method involves receiving a connection resume message with an indication to restore the SCG, which includes mandatory information such as reconfigurationWithSync or mobilityControlInfoSCG to trigger synchronization and random access towards the Primary SCG Cell (PSCell).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the connection resume message includes indication to restore SCG but excludes mandatory synchronization information, then the message size is reduced, but the SCG restoration fails due to lack of synchronization trigger
Solution Approach 1:
The patent applies preliminary action by including the synchronization trigger information (reconfigurationWithSync or mobilityControlInfoSCG) in the connection resume message before the UE needs to restore the SCG. This ensures that when the UE receives the resume message with restoreSCG indication, all necessary synchronization parameters are already available, eliminating the need for additional signaling exchanges and ensuring reliable SCG restoration.
2Reliability
If the connection resume message includes all mandatory synchronization information, then the SCG restoration reliability is improved, but the message size increases
Solution Approach 1:
The patent applies local quality by selectively including synchronization information only when the restoreSCG indication is present in the connection resume message. The network node determines whether to include reconfigurationWithSync or mobilityControlInfoSCG based on the specific restoration scenario, thereby optimizing the message size while ensuring reliability only where necessary.
3Speed
If the UE restores SCG without receiving synchronization trigger information, then the connection resumption speed is improved, but the random access procedure fails
Solution Approach 1:
The patent applies preliminary action by pre-configuring the synchronization trigger information (reconfigurationWithSync for NR SCG or mobilityControlInfoSCG for E-UTRA SCG) in the connection resume message before the UE initiates SCG restoration. This allows the UE to immediately perform synchronization and random access procedures without additional signaling delays, ensuring both fast resumption and reliable random access execution.
Data Source
AI summary
Systems and methods are disclosed herein for resuming a connection of a wireless communication device suspension to a dormant state while the wireless communication device was operating in dual connectivity with a Master Cell Group (MCG) with a first network node and a Secondary Cell Group (SCG) with a second network node. In one embodiment, a method performed by the wireless communication device comprises receiving a connection resume message with an indication to restore the SCG of the wireless communication device, where the connection resume message comprises information that is mandatory when the connection resume message comprises an indication to restore the SCG. The information that is mandatory comprises information that triggers synchronization and random access towards a Primary SCG Cell (PSCell) (e.g., reconfigurationWithSync or mobilityControlInfoSCG). The method further comprises restoring the SCG in accordance with the connection resume message. Corresponding embodiments of a wireless communication device are also disclosed.