Remote UE Multi-path Management via Relay Cell Reselection
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Solution Overview
Problem
In multi-path communication systems, cell reselection and handover of a relay UE can cause the base station for the relay UE to change, leading to issues with maintaining multi-path communication between the remote UE and the base station.
Innovation Solution
The remote UE is made aware of cell reselection and handover events of the relay UE, allowing it to decide whether to maintain multi-path communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell reselection and handover of relay UE are performed, then the relay UE can maintain connectivity with the network, but the base station for the relay UE becomes different which breaks multi-path communication requirement
Solution Approach 1:
The remote UE is notified in advance about the cell reselection or handover of the relay UE through a notification message from the relay UE. This preliminary notification allows the remote UE to proactively decide whether to maintain multi-path communication before the base station change occurs, thus preserving communication continuity while allowing necessary mobility adaptations.
2Reliability
If the remote UE maintains multi-path communication with a relay UE, then communication reliability is improved, but the remote UE cannot adapt when the relay UE's base station changes
Solution Approach 1:
The relay UE sends a notification message to the remote UE when cell reselection or handover occurs. This feedback mechanism provides the remote UE with real-time information about base station changes, enabling it to dynamically adjust its multi-path communication strategy by deciding whether to maintain or release the PC5 connection with the relay UE.
3Adaptability or versatility
If the remote UE is made aware of relay UE's cell reselection and handover, then the remote UE can make informed decisions about multi-path maintenance, but system complexity increases
Solution Approach 1:
The decision-making capability is extracted from the network side and placed at the remote UE side. The notification message contains essential information about base station changes, and the remote UE independently decides whether to maintain multi-path communication based on this information, simplifying the overall system architecture by distributing intelligence to the edge device.
Data Source
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AI summary
An embodiment according to the present disclosure provides a method for a remote UE to perform communication. The method comprises the steps of: communicating with a first base station through a direct path without relaying via a relay UE; receiving first SIB information from the first base station; establishing a first PC5 link with the relay UE; communicating with the first base station through an indirect path via the relay UE on the basis of the first PC5 link; receiving a notification message from the relay UE, wherein the notification message includes information indicating the relay UE has performed cell reselection and second SIB information received from a second base station by the relay UE, and the second base station manages a target cell of the cell reselection; and determining, on the basis of the first SIB information and the second SIB information, whether multi-path communication through the direct path and indirect path is possible.