Selective SCG Activation via Conditional PSCell Addition
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Solution Overview
Problem
In 5G wireless communication systems, frequent secondary cell group (SCG) changes under Dual Connectivity architecture lead to increased signaling overhead and interruption time due to the need for repeated network reconfiguration during conditional PSCell addition and change procedures, especially in 5G frequency range 2 (FR2) small cells.
Innovation Solution
Implementing a method where User Equipment (UE) can selectively activate and manage secondary cell groups without continuous network reconfiguration by storing and evaluating conditional triggering conditions for multiple candidate PSCells, allowing for subsequent conditional PSCell addition and change procedures without releasing existing configurations, thereby reducing signaling overhead and interruption time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequent SCG changes are performed under Dual Connectivity architecture, then network flexibility and adaptability are improved, but signaling overhead and interruption time increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate PSCells and their associated radio resource configurations before SCG changes are needed. The UE stores conditional triggering conditions and evaluates them in advance, so when an SCG change is required, the UE can immediately activate a pre-evaluated candidate without performing time-consuming reconfiguration procedures, thereby reducing interruption time while maintaining network flexibility
2Productivity
If repeated network reconfiguration is performed during conditional PSCell addition and change procedures, then SCG changes can be executed, but signaling overhead increases
Solution Approach 1:
The patent reduces signaling overhead by performing preliminary configuration of multiple candidate PSCells with their radio resource configurations stored at the UE. When triggering conditions are met, the UE activates pre-configured candidates without requiring repeated network reconfiguration signaling, thus enabling efficient SCG changes while minimizing signaling overhead
Solution Approach 2:
The patent uses copying by maintaining stored copies of radio resource configurations for multiple candidate PSCells at the UE. These copied configurations can be directly applied when candidates are selected, eliminating the need for repeated transmission of configuration signaling between network and UE, thereby reducing signaling overhead while maintaining the ability to execute SCG changes
Data Source
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AI summary
Aspects of the disclosure provide a method to activate secondary cell group (SCG) selectively. For example, the method can include receiving a radio resource control (RRC) reconfiguration message including first and second radio resource configurations of first and second primary secondary cells (PSCells) and conditional PSCell addition (CPA) and conditional PSCell change (CPC) triggering conditions, setting a current triggering condition to be the CPA triggering condition, evaluating the current triggering condition and determining that the first PSCell satisfies the current triggering condition, and performing a CPA step to add the first PSCell as a current SCG, updating the current triggering condition to be the CPC triggering condition, the UE still keeping the first and second radio resource configurations and the CPA and CPC triggering conditions for subsequent CPC step, without releasing the second radio resource configuration and the CPA and CPC triggering conditions associated with the second PSCell.