SCG Failure Cause Analysis for PSCell Selection Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication systems face challenges in analyzing secondary cell group (SCG) failures in terminal devices, particularly during conditional PSCell addition or change procedures, leading to handover failures and secondary cell group failures, which are not effectively addressed by current network optimization methods.
Innovation Solution
A communication method and device that enable the master node to perform cause analysis on SCG failures by identifying problematic nodes for wrong candidate primary secondary cell selection, using SCG failure information to optimize network configurations and reduce the likelihood of future failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master node sends CPAC configuration information to the terminal device to improve cell handover success rate, then the handover reliability is improved, but the device complexity increases due to multiple candidate cells and failure analysis requirements
Solution Approach 1:
The patent segments the failure analysis process by introducing a failure cause value that categorizes different types of SCG failures (e.g., T310 expiry, random access problem, reaching maximum RLC retransmissions). This segmentation allows the system to handle different failure types separately, reducing the overall complexity of failure analysis while maintaining high reliability through targeted optimization for each failure type.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal device reports SCG failure information including failure cause values to the master node. This feedback enables the network to analyze failure patterns and optimize CPAC configurations dynamically, improving handover reliability while managing complexity through data-driven decision making.
2Reliability
If the terminal device continuously monitors candidate primary secondary cells to improve handover reliability, then the handover success rate is improved, but the loss of time increases due to continuous monitoring and failure analysis
Solution Approach 1:
The patent applies preliminary action by having the terminal device continuously monitor candidate PSCells and pre-evaluate them against CPAC triggering conditions before handover is actually needed. This continuous preliminary assessment allows the device to be ready for rapid handover execution, improving reliability while reducing the time loss during actual handover events since the evaluation work is already done.
Solution Approach 2:
The patent changes the parameter of failure reporting by introducing a simplified failure cause value parameter that categorizes failures into predefined types. This parameter change reduces the complexity and time of failure analysis compared to detailed packet-level analysis, while still providing sufficient information for network optimization to improve handover success rates.
3Measurement precision
If detailed SCG failure information is collected and analyzed to identify problematic nodes, then the measurement precision is improved, but the loss of information increases due to the complexity of transmitting and processing failure data
Solution Approach 1:
The patent extracts only the essential failure cause information from detailed SCG failure analysis. By introducing a failure cause value that identifies the type of failure (e.g., T310 expiry, random access problem) and extracting key measurement results, the system achieves precise failure identification without transmitting unnecessary detailed information, thus reducing data overhead while maintaining measurement precision.
Solution Approach 2:
The patent applies local quality by providing detailed failure analysis information only where needed - specifically to the master node and relevant secondary nodes involved in the failed handover. The failure cause value and associated measurement results are targeted to specific network entities that can act on this information, reducing overall information loss while maintaining high measurement precision at critical points in the network.
Data Source
AI summary
A communication method and a device. In the method, a network side can perform cause analysis on a secondary cell group (SCG) failure of a terminal device based on SCG failure information reported by the terminal device, and determine a problematic node for wrong candidate primary secondary cell selection, so that configuration optimization on the network side can be completed, and more proper configuration can be performed for the terminal device in a subsequent primary secondary cell addition or change procedure of the user equipment (UE), to reduce a probability of the SCG failure of the terminal device.