SCG Link Failure Recovery With Inter-RAT Measurement Coordination
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively handling link failures, particularly in multiple-connectivity environments where Radio Link Failures (RLFs) occur in Master Cell Groups (MCGs) or Secondary Cell Groups (SCGs), necessitating optimized recovery methods.
Innovation Solution
A method and apparatus for managing link failures by detecting failures in Primary Cells (PCells) of SCGs, transmitting inter-Radio Access Technology (RAT) measurement configuration information to terminals, and controlling the base station to transmit information on identified cells to facilitate recovery procedures, involving transceivers and processors in the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple-connectivity is implemented to improve communication reliability, then link failure handling complexity increases
Solution Approach 1:
The patent segments the cell group into Master Cell Group (MCG) and Secondary Cell Group (SCG), with distinct failure handling procedures for each. When a link failure occurs in SCG, the system separates the failure detection, notification, and recovery processes into specific steps involving different base stations (serving base station and target base station), thereby managing the complexity of multiple-connectivity through structured division of failure handling responsibilities.
Solution Approach 2:
The patent introduces an intermediary notification mechanism where the terminal device acts as a mediator to inform the serving base station about SCG link failures. The serving base station then coordinates with the target base station through structured signaling (failure information, measurement configuration, cell information exchange). This intermediary approach simplifies the overall failure handling complexity by establishing clear communication protocols between multiple entities.
2Reliability
If link failure detection and recovery procedures are enhanced, then communication reliability improves, but system operation complexity increases
Solution Approach 1:
The patent implements preliminary actions by pre-configuring measurement parameters and cell information in the target base station before link failures occur. When a failure is detected, the pre-prepared measurement configuration and cell information can be immediately activated, enabling faster recovery without requiring complex real-time decision-making. This preliminary preparation simplifies the operational complexity during actual failure scenarios.
Solution Approach 2:
The patent establishes a feedback mechanism where the terminal device continuously monitors SCG link quality and provides feedback to the serving base station. Upon detecting link failure, the terminal sends failure information as feedback, triggering a structured recovery process. This feedback-driven approach improves reliability by ensuring timely detection and response, while the standardized feedback format keeps the system operation manageable.
3Adaptability or versatility
If inter-RAT measurement configuration is transmitted for failure recovery, then connectivity recovery capability improves, but information transmission overhead increases
Solution Approach 1:
The patent extracts and transmits only the essential information needed for failure recovery: measurement configuration parameters and specific cell information from the target base station. By selecting and transmitting only the critical subset of information rather than complete base station configurations, the system improves connectivity recovery capability while minimizing information transmission overhead.
Solution Approach 2:
The patent applies local quality by providing specific, targeted measurement configuration and cell information relevant to the failed SCG and potential target cells, rather than transmitting comprehensive global configuration data. This localized information transmission focuses resources on the specific recovery needs, improving adaptability for recovery while reducing overall information overhead.
Data Source
AI summary
The disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting higher data transfer rates than 4th generation (4G) communication systems such as long term evolution (LTE). According to various embodiments of the disclosure, a method for operating a base station in which a Master Cell Group (MCG) is configured in a wireless communication system may include: detecting a failure of a Primary Cell (PCell) of a Secondary Cell Group (SCG) (PScell), transmitting inter-Radio Access Technology (RAT) measurement configuration information to a terminal based on the detection, and transmitting information on a cell identified based on the measurement configuration information to a base station in which the SCG is configured.