UE Radio Link Failure Reporting With Multi-Report Retrieval
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Solution Overview
Problem
Conventional radio link failure (RLF) reporting techniques in wireless networks do not enable user equipment (UE) to report all relevant information related to RLF and handover failures, leading to issues and difficulties for both the network and UEs.
Innovation Solution
Improved RLF reporting methods that allow UEs to send first and second RLF reports to a radio network node, along with indications of availability of further stored RLF reports, facilitating comprehensive RLF information collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional RLF reporting techniques are used, then the reporting process is simple, but the network cannot obtain complete RLF information leading to report loss
Solution Approach 1:
The patent segments the RLF reporting process into multiple stages: initial RLF indication, network request for additional reports, and subsequent report transmissions. This segmentation allows the network to systematically collect multiple RLF reports without requiring the UE to transmit all reports at once, thereby preventing information loss while managing complexity through structured multi-step communication
Solution Approach 2:
The patent implements preliminary action by having the UE store multiple RLF reports in advance before network retrieval. The UE maintains a buffer of stored RLF reports and provides indications of available reports to the network, enabling the network to request specific reports as needed. This preliminary storage ensures reports are preserved and available for retrieval, preventing loss while allowing on-demand collection
2Reliability
If multiple RLF reports are collected comprehensively, then network planning improves, but the reporting mechanism becomes more complex
Solution Approach 1:
The patent implements feedback mechanisms where the network receives indications from the UE about available stored RLF reports, and the network subsequently sends requests for specific reports. This feedback loop allows the network to adaptively collect the necessary reports for reliable network planning while managing complexity through controlled interaction rather than requiring the UE to autonomously manage complex reporting logic
Solution Approach 2:
The patent introduces dynamic elements by allowing the reporting process to adapt based on network needs. The network can request specific reports from the stored buffer based on current network conditions and planning requirements. This dynamic retrieval process ensures reliable information collection tailored to actual network needs while keeping the mechanism flexible and manageable
3Duration of action of stationary object
If RLF reports are stored for extended periods, then report availability increases, but the likelihood of memory overflow and report loss increases
Solution Approach 1:
The patent applies partial action by having the UE store a limited buffer of recent RLF reports rather than attempting to store all historical reports indefinitely. The buffer size is configured to hold a practical number of reports (e.g., a few dozen reports), which is sufficient for network analysis purposes while avoiding memory overflow. The network retrieves the necessary reports from this partial storage, balancing duration with reliability
Data Source
AI summary
Methods and apparatuses for a user equipment, UE, to report radio link failure, RLF, in a wireless network, said methods include sending, to a radio network node, RNN, in the wireless network, a first message including: a first RLF report related to an RLF that occurred in a cell of the wireless network, and a second indication of availability of one or more further RLF reports stored by the UE. The methods further include receiving, from the RNN, a second request for at least a portion of the stored RLF reports indicated by the second indication and sending, to the RNN, a second response including a second RLF report of the stored RLF reports. The apparatuses are configured to perform such methods.