Group Handover Synchronization in Layer 2 Sidelink Relaying
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Solution Overview
Problem
In 5G new radio (NR) wireless communications, the group handover procedure in layer 2 sidelink relaying faces challenges in meeting timing constraints due to difficulties in synchronizing handover messages between relay UEs and network nodes, particularly in sidelink relaying architectures where relay UEs need to forward messages at specific stages of the handover operation.
Innovation Solution
A method is proposed where messages during the group handover procedure are selectively delayed or omitted to ensure synchronization, allowing a relay device and remote devices to be collectively relocated from a source network node to a target network node, with the relay UE receiving and processing handover commands and messages to coordinate the handover operations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay UE forwards handover messages at specific stages of the handover operation, then the handover procedure can be completed for all involved UEs, but the timing constraints and synchronization requirements increase the complexity of the procedure
Solution Approach 1:
The relay UE performs preliminary actions by receiving the handover command from the source gNB before forwarding it to remote UEs. The relay UE prepares the handover command with necessary configuration information and forwards it to remote UEs in advance, ensuring they can complete handover synchronization without increasing overall procedure complexity
Solution Approach 2:
The relay UE acts as an intermediary between the source gNB and remote UEs during the handover process. It receives handover commands from the source gNB, forwards them to remote UEs, and collects handover complete messages from remote UEs to forward back to the target gNB, thereby simplifying the overall handover procedure by mediating message exchanges
2Reliability
If messages are forwarded at specific stages to meet timing constraints, then synchronization is achieved, but the risk of message delivery to wrong network node or loss increases
Solution Approach 1:
The relay UE performs preliminary forwarding of the handover command to remote UEs before completing its own handover to the target gNB. This ensures remote UEs receive the handover command in time and can prepare for synchronized handover, preventing message delivery to the wrong network node
Solution Approach 2:
The relay UE implements feedback mechanisms by receiving handover complete messages from remote UEs and forwarding them to the target gNB. This feedback loop ensures proper timing and synchronization, confirming that messages are delivered to the correct network node at the appropriate stage
Data Source
AI summary
A method of performing a group handover procedure in a layer 2 relaying architecture is proposed to meet the group handover timing constraints. A relay device and one or more remote devices are collectively relocated from a source network node to a target network node, where messages of the group handover procedure are selectively delayed or omitted to ensure synchronisation of the handover operations at the various devices.