MCG Failure Reporting for 5G RLF Recovery
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Solution Overview
Problem
In 5G networks, radio link failures (RLFs) lead to degraded user experience and performance, as existing reporting mechanisms do not provide sufficient information for the network to identify the causes of RLFs, resulting in suboptimal mobility parameter settings and potential coverage holes.
Innovation Solution
A method where user equipment (UE) detects RLFs and generates and stores RLF reports, even when configured for fast MCG failure recovery, including enhanced information such as location and measurement results, allowing the network to optimize handover parameters and identify issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE initiates fast MCG link recovery procedure upon detecting RLF, then the recovery time is reduced and user experience is improved, but the RLF report information is lost and cannot be used for network optimization
Solution Approach 1:
The UE stores the RLF report information in advance (before initiating fast recovery) by saving the failure cause, measurement results, and location information. This preliminary action ensures that the information is preserved even when fast recovery is triggered, allowing both quick recovery and subsequent network optimization.
Solution Approach 2:
The patent introduces an intermediary mechanism where the UE acts as a bridge between the radio link failure event and the network optimization process. By storing and subsequently reporting the RLF information through available signaling channels (such as when reestablishing connection or upon network request), the UE enables network optimization without delaying the fast recovery process.
2Measurement precision
If the UE stores RLF report with enhanced information (location, measurement results), then the network can identify coverage holes and optimize handover parameters, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by selectively storing and reporting specific types of information based on their usefulness for network optimization. Rather than reporting all possible data, the UE focuses on storing enhanced location information (GPS coordinates), measurement results (RSRP, RSRQ), and failure causes, which are the most valuable for identifying coverage holes and optimizing handover parameters.
Solution Approach 2:
The patent changes the parameters of the RLF report by enhancing it with additional information elements such as precise location data, detailed measurement results, and specific failure causes. This transformation of the report structure enables more accurate network optimization while managing complexity through standardized information categories.
3Reliability
If the UE reports RLF information frequently and in detail, then the network can optimize mobility parameters effectively, but the signaling overhead increases and network resources are consumed
Solution Approach 1:
The patent extracts only the essential and most valuable information from the RLF event for reporting to the network. By selecting specific elements such as location, measurement results, and failure causes, the UE reduces signaling overhead while maintaining the reliability needed for effective mobility optimization. unnecessary or redundant information is excluded from the report.
Data Source
AI summary
A method (400) for providing radio link failure (RLF) information. The method includes a UE (302) detecting (s402) an RLF with respect to a master cell group (MCG). The method also includes, in response to detecting the RLF with respect to the MCG, the UE either storing an RLF report and initiating a fast MCG link recovery procedure (s404) or transmitting an enhanced MCG failure information message as part of the fast MCG link recovery procedure.