Terminal SCG Failure Reporting for Deactivated Cells
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Solution Overview
Problem
User Equipment (UE) faces challenges in determining appropriate content for Secondary Cell Group (SCG) failure information when performing Radio Link Monitoring (RLM) and/or Beam Fault Detection (BFD) for deactivated SCG cells, as it cannot accurately transmit this information to the network.
Innovation Solution
A terminal with a control unit that deactivates secondary cell groups based on their state and a transmission unit that sends SCG failure information to the network, including specific information elements such as cell state, identification, and failure cause, when a failure occurs in an inactive SCG state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits SCG failure information when a failure occurs in an inactive SCG state, then the network can receive failure information for optimization, but the UE cannot determine the appropriate content to include in the failure information
Solution Approach 1:
The failure information is segmented into multiple information elements including failedCellID, scgFailureInfo, and deactivatedSCGFailureInfo. Each element carries specific aspects of the failure state, allowing the network to reconstruct the complete failure scenario accurately.
Solution Approach 2:
The UE performs preliminary measurements and evaluations of cell states before the failure occurs. When failure happens, these pre-collected data (cell state, measurement results, beam information) are immediately packaged into the failure information message, enabling accurate reporting without delay.
2Measurement precision
If the UE performs RLM and BFD for deactivated SCG cells, then the network can obtain quality data for optimization, but the UE cannot accurately transmit this information to the network
Solution Approach 1:
Measurement information is divided into distinct components: RLM results, BFD results, cell state indicators, and beam quality metrics. Each component is encoded as a separate information element, ensuring that all measurement precision data is preserved and transmitted完整地 to the network.
Solution Approach 2:
The system implements a feedback mechanism where the UE continuously monitors cell state and measurement results, then feeds back this information through the failure information message. This closed-loop feedback ensures that the network receives accurate and complete measurement data for optimization decisions.
Data Source
AI summary
A terminal deactivates a secondary cell group according to a state of the secondary cell group. The terminal also transmits failure information of the secondary cell group to a network. When a failure of the secondary cell group in an inactive state occurs, the terminal transmits failure information including an information element indicating a state of cells of the secondary cell group.