Relay UE Handover Notification for V2X Service Continuity
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Solution Overview
Problem
There is currently no procedure for managing situations where a relay UE cannot perform relay operations for a remote UE in V2X communication systems, leading to potential service disruptions.
Innovation Solution
A method and apparatus for wireless communication that involves establishing a radio resource control (RRC) connection with a first base station, setting up a PC5 connection with a second device, receiving an RRC reconfiguration message for handover, and transmitting information regarding relay reselection to the second device, allowing the relay device to switch to a new base station and ensuring continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay UE performs handover to a new base station, then the relay connection is maintained and service continuity is improved, but the remote UE may be left without a valid relay device causing communication disruption
Solution Approach 1:
The patent applies preliminary action by having the relay UE proactively notify the remote UE about upcoming handover events before the actual handover occurs. This allows the remote UE to prepare for relay reselection in advance, ensuring that when the handover happens, the remote UE can quickly switch to a new relay device without communication disruption, thus maintaining service continuity while adapting to the changed relay environment
2Speed
If the remote UE continuously monitors for relay device changes, then relay reselection speed is improved, but power consumption increases excessively
Solution Approach 1:
The patent implements feedback by establishing a notification mechanism where the relay UE actively informs the remote UE about handover events. Instead of continuous monitoring, the remote UE receives targeted feedback only when necessary (when the relay UE undergoes handover), enabling fast relay reselection at critical moments while avoiding constant power-consuming monitoring, thus resolving the contradiction between speed and energy consumption
Data Source
AI summary
Provided are a method for performing wireless communication by a first device, and an apparatus for supporting same. The method may comprise: establishing a radio resource control (RRC) connection with a first base station; establishing a PC5 connection with a second device; receiving an RRC reconfiguration message for handover from the first base station; establishing an RRC connection with a second base station based on the RRC reconfiguration message; and based on (i) the first device which is a relay device relaying communication between the second device and the first base station, and (ii) the first device establishing the RRC connection with the second base station, transmitting information regarding relay reselection to the second device.