Master Cell Group Failure Reporting Path Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems, particularly in 3GPP LTE and NR, face challenges in efficiently reporting master cell group (MCG) failures, which can disrupt service quality and reliability, especially in scenarios requiring low latency and high reliability like ultra-reliable and low latency communications (URLLC).
Innovation Solution
A method and apparatus for determining and transmitting MCG failure information from a primary cell to a secondary cell within the same master cell group (MCG) or secondary cell group (SCG), allowing for effective reporting of failures through pre-configured paths or prioritized paths, potentially using duplicated message transmissions for increased reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection re-establishment procedures are performed upon MCG failure, then service reliability is improved, but service interruption time increases
Solution Approach 1:
The patent pre-configures multiple reporting paths (via SCell of MCG and via SCG) before failure occurs. When MCG failure happens, the UE can immediately use the pre-configured alternative path without waiting for connection re-establishment, thus reducing service interruption time while maintaining reliability through redundant path configuration.
Solution Approach 2:
The patent introduces a secondary node (SN) and its cell group (SCG) as an intermediary path for failure reporting. When MCG fails, the failure information can be transmitted through the SN via the SCG, acting as a mediator that bypasses the failed MCG path and delivers the failure report to the network without requiring full connection re-establishment.
2Reliability
If multiple reporting paths are configured for MCG failure, then reporting reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic path selection where the UE chooses the reporting path based on current conditions. The UE can switch between the SCell-based path and the SCG-based path depending on which path is available and appropriate, making the system adaptive rather than static, thus managing complexity through conditional logic rather than always maintaining all paths active.
Solution Approach 2:
The patent divides the failure reporting function into two separate configurable paths: one through the SCell of the MCG and another through the SCG. This segmentation allows the network to configure and activate only the necessary paths for each scenario, reducing the operational complexity while maintaining the reliability benefits of having multiple potential paths available.
3Loss of time
If MCG failure information is transmitted via SCell of MCG, then reporting latency is reduced, but path availability may be compromised
Solution Approach 1:
The patent uses the secondary node (SN) and SCG as an intermediary alternative path. When the direct SCell path is unavailable or unsuitable, the failure information can be routed through the SN via the SCG, ensuring path availability is maintained while accepting potentially increased latency only when necessary.
Solution Approach 2:
The patent implements dynamic path selection where the UE evaluates the availability and suitability of the SCell path versus the SCG path in real-time. The system dynamically switches between paths based on current network conditions, prioritizing the lower-latency SCell path when available while falling back to the SCG path when needed, thus balancing latency and availability requirements.
Data Source
AI summary
A method and apparatus for path selection scheme for a master cell group (MCG) failure reporting is provided. A wireless device configured to operate in a wireless communication system determines a path for master cell group (MCG) failure information to inform a failure on a primary cell (PCell) of a MCG from among the at least one secondary ell (SCell) of the MCG and a secondary cell group (SCG), and transmits the MCG failure information via the determined path.