Remote UE Relay Switching With Event-Triggered Sidelink Reporting
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing indirect-to-indirect path switching in wireless communication systems, particularly in scenarios involving remote user equipment (UE) and relay UEs, where timely measurement reporting is crucial for maintaining reliable and efficient data transmission.
Innovation Solution
A method for operating a remote UE in a wireless communication system that involves establishing a connection with a first relay UE, transmitting data through the relay UE, and performing a sidelink measurement report based on predetermined event thresholds, where the first relay UE becomes worse than a first threshold and a candidate relay UE becomes better than a second threshold, allowing for efficient measurement reporting during indirect-to-indirect path switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement reporting is continuously performed during indirect-to-indirect path switching, then the reliability of path selection is improved, but the energy consumption and signaling overhead increase
Solution Approach 1:
The patent implements event-triggered measurement reporting where the remote UE performs measurements periodically but only reports when specific events occur (A3 event: candidate relay becomes better than serving relay by offset). This reduces energy consumption compared to continuous reporting while maintaining reliable path selection through event-based triggers.
Solution Approach 2:
The system uses feedback mechanisms where the remote UE monitors sidelink reference signal received power (SL RSRP) of serving and candidate relay UEs, compares measurements against configured thresholds and offsets, and triggers reporting only when conditions are met. This feedback-based approach optimizes energy usage while ensuring reliable path switching decisions.
2Adaptability or versatility
If measurement reporting threshold is set low for frequent path switching, then the adaptability of path selection is improved, but the signaling overhead and network load increase
Solution Approach 1:
The patent introduces an offset parameter (a3-Offset) that is added to the threshold condition, effectively changing the parameter for triggering measurement reports. This offset allows the system to adjust the sensitivity of path switching - a larger offset reduces signaling overhead by requiring more significant quality differences before switching, while still maintaining adaptability through configurable parameters.
Solution Approach 2:
The system applies partial action by not reporting every measurement change but only when the quality difference exceeds the configured offset threshold. This selective reporting reduces signaling overhead while maintaining sufficient path selection adaptability for meaningful quality changes.
3Use of energy by moving object
If measurement reporting is delayed during indirect-to-indirect path switching, then the energy consumption is reduced, but the latency of path switching increases
Solution Approach 1:
The remote UE performs measurements continuously in the background as preliminary action, keeping measurement data ready but not triggering reports until events occur. This allows rapid path switching when conditions change while minimizing energy consumption by only activating reporting when necessary, rather than delaying measurements themselves.
Data Source
AI summary
An embodiment relates to an operation method of a remote UE related to a U2N relay in a wireless communication system, the method comprising: establishing a connection with a first relay UE, by the remote UE; transmitting data to a base station through the first relay UE, by the remote UE; considering whether a predetermined event related to the first relay UE and a candidate relay UE is satisfied, by the remote UE; and performing sidelink (SL) measurement reporting for an indirect path on the basis of satisfaction of the predetermined event, wherein the predetermined event corresponds to a case in which the first relay UE has a value worse than a first threshold and the candidate relay UE has a value better than a second threshold.