Remote UE Path Switch Failure Handling in Relay Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in handling path switch failures, particularly when a relay UE is in an idle or inactive state, leading to issues such as identifier changes, cell reselections, and failure to enter a connected state.
Innovation Solution
The method involves a remote UE receiving an identifier associated with a relay UE and a serving cell for a path switch, and subsequently obtaining a local identifier through a sidelink interface. This allows the remote UE to identify path switch failure conditions while the relay UE is in an idle or inactive state, and initiate appropriate actions such as RRC re-establishment or path switch procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the relay UE is in idle or inactive state during path switch, then power consumption is reduced and device can perform other tasks, but path switch failure occurs and communication reliability deteriorates
Solution Approach 1:
The network node provides path switch failure handling information to the remote UE in advance, before the actual path switch occurs. This allows the remote UE to be prepared with the necessary information (relay UE identifier, serving cell identifier, local identifier) to detect and handle path switch failures if they occur when the relay UE is in idle or inactive state, thus maintaining reliability while allowing the relay UE to remain in low-power state
Solution Approach 2:
The mechanism enables feedback from the remote UE to the network node about path switch failure conditions. The remote UE monitors whether the relay UE is reachable during path switch and reports failure conditions back to the network, allowing the network to take corrective actions and improve overall path switch reliability
2Measurement precision
If the remote UE monitors path switch status continuously, then path switch failure detection accuracy is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The monitoring function is extracted and simplified: instead of continuous monitoring, the remote UE only needs to check specific indicators (relay UE identifier, serving cell identifier, local identifier) that are provided in advance by the network. This extraction of essential monitoring elements reduces system complexity while maintaining adequate detection accuracy
Solution Approach 2:
Instead of implementing full continuous monitoring which would be complex and resource-intensive, the solution uses partial monitoring by checking specific key parameters (identifiers) at critical moments during the path switch procedure. This partial action approach achieves sufficient detection accuracy without the overhead of complete continuous monitoring
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a remote user equipment (UE) may receive an identifier associated with a relay UE and an identifier associated with a serving cell of the relay UE for a path switch. The UE may receive a local identifier associated with the remote UE based at least in part on connecting with the relay UE over a sidelink interface. The UE may identify, based at least in part on receiving the local identifier, a path switch failure condition associated with the relay UE while the relay UE is in an idle state or an inactive state. Numerous other aspects are described.