Multi-Path Relay RLF Reporting via Healthy Sidelink Path
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing radio link failures (RLF) in multi-path relays, particularly in scenarios requiring high reliability and low latency, such as vehicle-to-everything (V2X) communications, where efficient path switching and reporting of RLF are crucial for maintaining connectivity.
Innovation Solution
A method and device for a remote user equipment (UE) to establish both direct and relay paths, reporting radio link failure (RLF) through a Sidelink Signaling Radio Bearer on the path not experiencing failure, enabling the base station (gNB) to take appropriate action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-path relay is used to improve communication reliability, then connectivity reliability is improved, but complexity of managing radio link failures increases
Solution Approach 1:
The patent segments the communication path into multiple independent paths (direct path and relay path) with separate failure detection and reporting mechanisms. Each path can be monitored independently, and failure reports are routed through alternative paths, dividing the management complexity into manageable segments while maintaining overall reliability.
Solution Approach 2:
The patent introduces an intermediary failure reporting mechanism that uses the Sidelink Signaling Radio Bearer as a mediator to transmit RLF information. This intermediary channel ensures that failure notifications are delivered reliably through the path that is currently functional, avoiding direct complexity in failure detection while maintaining communication integrity.
2Reliability
If path switching is implemented to maintain connectivity during RLF, then communication continuity is improved, but time for path detection and switching increases
Solution Approach 1:
The patent implements preliminary action by pre-establishing multiple paths (direct and relay) before failure occurs and configuring failure detection mechanisms in advance. When RLF is detected, the system can quickly switch to the alternative pre-configured path, reducing the time required for path detection and switching while maintaining communication continuity.
Solution Approach 2:
The patent employs feedback mechanisms where the UE continuously monitors the status of both paths and reports RLF conditions to the network. This feedback loop enables real-time detection of failures and triggers immediate path switching, minimizing the time loss while ensuring continuous communication through the healthy path.
3Loss of information
If RLF reporting through alternative path is implemented, then network awareness of failure is improved, but complexity of failure detection and reporting increases
Solution Approach 1:
The patent uses the Sidelink Signaling Radio Bearer as an intermediary channel to transmit failure information. This mediator simplifies the reporting mechanism by providing a dedicated channel for RLF notifications, making failure detection and reporting less complex while ensuring the network receives accurate failure information through the alternative path.
Solution Approach 2:
The patent implements self-service by having the UE autonomously detect RLF conditions and generate failure reports without requiring complex network intervention. The UE automatically monitors path status, detects failures, and routes reports through the healthy path, simplifying the overall failure detection and reporting process while maintaining network awareness.
Data Source
AI summary
An embodiment relates to an operation method of a remote user equipment (ULE) in a wireless communication system, in which: the remote UE establishes a radio resource control (RRC) connection to a base station; the remote UE establishes a PC5 RRC connection to a relay UE; and the remote UE transmits data to the base station through one path among i) a first path for direct data transmission to the base station and ii) a second path for data transmission to the base station via the relay UE, wherein, on the basis of a radio link failure (RLF) being detected in one path among the first path and the second path, the remote UE reports the RLF to the base station via a message based on a sidelink signaling radio bearer through the path in which the RLF is not detected.