Remote UE Handover Trigger via Relay Mobility
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Solution Overview
Problem
Wireless communications systems face interruptions and reduced user experience due to the complexity of performing cell handover procedures when relay user equipment (UE) mobility occurs, especially in systems that do not support group mobility, leading to losses in wireless communications at remote UEs.
Innovation Solution
The described techniques enable improved handover procedures for both relay UEs and remote UEs by allowing the remote UE to receive a trigger for handover, suspend communications with the source relay UE, and re-establish connections with a target relay UE or directly with a base station, reducing interruptions and maintaining data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay UE performs handover procedure in systems that do not support group mobility, then relay UE can switch base stations, but remote UE experiences communication interruptions and loss
Solution Approach 1:
The source relay UE transmits a trigger message to the remote UE before actually performing the handover procedure. This preliminary notification allows the remote UE to prepare for the upcoming handover by suspending communications with the source relay UE in advance, thereby preventing communication interruptions and data loss when the relay UE switches base stations.
2Reliability
If remote UE suspends communications during relay UE handover, then data transfer interruptions are reduced, but handover procedure complexity increases
Solution Approach 1:
The handover procedure incorporates feedback mechanisms where the source relay UE notifies the remote UE about the upcoming handover through trigger messages. This feedback loop allows the remote UE to adjust its communication state accordingly, suspending connections before handover occurs and resuming them after, thereby maintaining data transfer continuity while managing the complexity through structured information exchange.
3Reliability
If remote UE performs handover procedure due to relay UE mobility, then connection can be maintained, but power consumption increases
Solution Approach 1:
By receiving advance notification of the relay UE's handover through trigger messages, the remote UE can suspend its communication connection before the handover occurs. This preliminary action prevents the remote UE from maintaining an active connection during the handover process, thereby avoiding unnecessary power consumption while still ensuring connection continuity through proper handover execution.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may be configured to communicate with a first base station, where the first UE is configured to relay wireless communications between a second UE and the first base station via at least a sidelink communication link between the first UE and the second UE. The first UE may receive, from the first base station, an indication for the first UE to perform a first handover procedure from the first base station to a second base station. The first UE may transmit, to the second UE via the sidelink communication link and based on receiving the indication to perform the first handover procedure, a sidelink transmission including a trigger for the second UE to perform a second handover procedure or a reselection procedure. The first UE may then communicate with the second base station based on performing the first handover procedure from the first base station to the second base station.