Radio Link Failure Cause Detection in Heterogeneous Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of heterogeneous network deployment in mobile communication systems, existing technologies face challenges in accurately determining the cause of radio link failure (RLF) or handover failure, especially when handovers occur between macro and pico cells, due to difficulties in identifying the correct context and configuration information of user equipment (UE) that has moved away from the serving cell.
Innovation Solution
A method is introduced where a first base station transmits a handover request message with the UE's cell-radio network temporary identifier (C-RNTI) to a second base station, which then receives an RLF report from the UE, including time information and C-RNTI of the last serving cell, to identify the UE's context and determine the cause of the failure, ensuring accurate determination of RLF or handover failure without saving context information of moved-away UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If context information of UE is saved at the source base station after handover, then the cause of RLF or handover failure can be determined, but system resources are wasted by maintaining context information of moved-away UE
Solution Approach 1:
The patent extracts the essential identification information (C-RNTI and time information) from the complete context information and transmits it to the target base station. This allows the source base station to determine the failure cause without retaining the full context information of the moved-away UE, thus resolving the contradiction between determination accuracy and resource consumption.
Solution Approach 2:
The patent introduces time information as an intermediary element that enables the target base station to identify the UE context at the source base station without the source base station needing to maintain the complete context information. This intermediary mechanism allows accurate failure cause determination while reducing resource usage.
2Ease of operation
If the target base station determines the cause of failure independently, then the determination process is simplified, but accuracy decreases due to inability to identify correct UE context and configuration information
Solution Approach 1:
The patent applies preliminary action by having the source base station transmit the C-RNTI and time information to the target base station before the failure determination process. This preliminary provision of identification information enables the target base station to accurately identify the UE context and configuration information, thereby improving determination accuracy while maintaining process simplicity.
3Measurement precision
If context information is retained longer in the system, then accurate failure cause determination is achieved, but the time for system optimization is extended
Solution Approach 1:
The patent creates a temporary copy of the essential identification information (C-RNTI and time information) and transmits it to the target base station. This copying mechanism allows the target base station to perform accurate failure cause determination without requiring the source base station to retain the complete context information for an extended period, thus reducing the time loss while maintaining determination accuracy.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for detecting a cause of radio link failure (RLF) or handover failure, in which the first base station triggers a handover process for the UE, and the mobility or handover information of the UE in the source cell is sent to a second base station. After the second base station receives the RLF report of the UE, the second base station can determine cause of a failure according to the RLF report of the UE and the mobility or handover information of the UE in the source cell. Other methods detect a cause of radio link failure (RLF) or handover failure. Application of the methods can improve the accuracy of determining the cause of the RLF or handover failure, improve efficiency of MRO and improve system performance.