5G Radio Link Failure Handling via Dynamic Timer Thresholds
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Solution Overview
Problem
In high-frequency band networks like 5G, devices are susceptible to connection blockages due to obstructions, leading to radio link failures (RLF) and significant degradation in data communication performance, as existing technologies often declare RLF too quickly, triggering lengthy recovery procedures that are not necessary for temporary blockages.
Innovation Solution
Implementing a mechanism where user equipment (UE) and evolved NodeB (eNodeB) maintain the RRC connected mode during temporary 5G channel blockages, switching to a secondary LTE link if necessary, without declaring RLF, and using timers to manage retransmissions and wait for blockage clearance, thereby avoiding unnecessary RLF recovery procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing technologies declare RLF quickly upon detecting blockages, then connection reliability is improved by promptly identifying failed links, but data throughput deteriorates due to triggering lengthy recovery procedures for temporary blockages
Solution Approach 1:
The system dynamically adjusts the RLF declaration threshold based on blockage duration. Temporary blockages below a time threshold do not trigger RLF, while persistent blockages exceed the threshold and trigger RLF. This dynamic adjustment resolves the contradiction by adapting the reliability criterion to the actual blockage characteristics, preventing unnecessary recovery procedures for temporary blockages while maintaining prompt detection for persistent failures.
Solution Approach 2:
The system implements a waiting period timer before declaring RLF. During this preliminary action phase, the system monitors whether the blockage persists beyond the threshold duration. This preliminary monitoring action allows the system to distinguish between temporary and persistent blockages before committing to RLF declaration, thereby avoiding premature recovery procedures that would reduce data throughput.
2Stability of the object's composition
If RLF recovery procedures are triggered for temporary blockages, then connection stability is improved by ensuring failed links are properly recovered, but loss of time increases due to lengthy recovery procedures
Solution Approach 1:
The system dynamically determines whether to initiate RLF recovery procedures based on the blockage duration relative to a predefined threshold. For temporary blockages below the threshold, the system maintains the connected state without triggering recovery. For persistent blockages exceeding the threshold, the system proceeds with standard RLF recovery. This dynamic decision-making eliminates unnecessary recovery operations while preserving stability for genuine failures.
Solution Approach 2:
The invention extracts the temporary blockage condition from the set of conditions that trigger RLF recovery procedures. By separating temporary blockages from persistent failures through duration-based classification, the system removes unnecessary recovery operations from the execution flow, thereby reducing time loss while maintaining connection stability for actual failures.
3Reliability
If devices switch to secondary LTE link during 5G blockages, then connectivity reliability is improved by maintaining alternative communication paths, but device complexity increases due to managing multiple radio links
Solution Approach 1:
The system uses the blockage duration threshold as an intermediary decision criterion to determine whether to activate the secondary LTE link. This intermediary threshold simplifies the complexity by providing a clear, automated decision rule: if blockage exceeds the threshold, switch to LTE; otherwise, maintain 5G connection. This intermediary mechanism manages multi-link complexity through automated threshold-based switching rather than complex real-time evaluation.
Data Source
AI summary
Embodiments described herein relate generally to a communication between a user equipment (UE) and an evolved nodeB (eNodeB) communicating over a 5G link. Data rate throughput may be increased when, after a 5G channel blockage occurs, the UE may wait a determined amount of time to discover if the channel has opened before initiating a radio link failure (“RLF”) and RLF recovery procedure.