Preliminary Radio Link Failure Detection in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, link failures can occur due to mobility issues, leading to degraded sidelink and access link quality, necessitating effective detection and handling to maintain service continuity, latency, and reliability.
Innovation Solution
A method where a first wireless device receives information about a preliminary radio link failure from a second device, transmits discovery messages to search for other wireless devices, and establishes a connection with a third device based on relaxed link failure conditions, allowing for proactive link management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RLF detection is used, then link failure is detected after it occurs, but service continuity is degraded due to delayed response
Solution Approach 1:
The patent applies preliminary action by introducing pre-RLF detection that identifies link failure conditions before actual RLF occurs. The system monitors link quality parameters and triggers early warning signals when degradation is detected, allowing the remote UE to proactively search for alternative links before the current link completely fails, thus maintaining service continuity without significant time loss.
Solution Approach 2:
The patent implements preliminary anti-action by taking countermeasures before link failure impacts service. When pre-RLF is detected, the system initiates link switching procedures in advance, preparing alternative communication paths before the primary link becomes unusable. This preemptive approach prevents service interruption rather than responding after failure occurs.
2Measurement precision
If link failure is detected using strict conditions, then false alarms are reduced, but detection sensitivity decreases leading to delayed failure detection
Solution Approach 1:
The patent segments link failure detection into two distinct mechanisms: pre-RLF detection with relaxed conditions for early warning, and actual RLF detection with strict conditions for confirmation. This segmentation allows the system to use sensitive monitoring that triggers early alerts without causing false alarms, as the pre-RLF state must progress to actual RLF for service impact to occur.
Solution Approach 2:
The patent applies preliminary action by implementing a two-stage detection process where pre-RLF serves as an early warning phase with relaxed detection conditions. This preliminary stage increases detection sensitivity and timeliness without compromising overall accuracy, because the system prepares for potential failure before it actually impacts service.
3Reliability
If proactive link searching is implemented, then service continuity is improved, but device complexity and energy consumption increase
Solution Approach 1:
The patent applies local quality by enabling proactive link searching only when pre-RLF is detected, rather than continuously monitoring all possible links. The discovery message transmission and link switching procedures are activated locally at the remote UE only when needed, reducing overall device complexity and energy consumption while maintaining service continuity when link failures are anticipated.
Solution Approach 2:
The patent implements preliminary action by preparing alternative links only when pre-RLF conditions are met. The system performs discovery message transmission and link establishment procedures in advance of actual failure, but only activates these resource-intensive operations when the relaxed detection conditions indicate potential problems, rather than maintaining constant readiness.
Data Source
AI summary
The present disclosure relates to handling a link failure in a wireless communication system. According to an embodiment of the present disclosure, a first wireless device may receive a preliminary radio link failure (pre-RLF) indication from a second wireless device, and perform proper actions upon receiving the pre-RLF indication.