Terminal Relay Path Control for Direct Link Failure Reporting
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Solution Overview
Problem
Existing communication technologies in 3GPP, such as NR sidelink and UE-to-network relay, face inefficiencies in managing radio link failures and path changes in multi-path relay scenarios, leading to suboptimal communication control.
Innovation Solution
A terminal apparatus is designed to detect radio link failures and determine if procedures for changing or adding indirect paths are ongoing, reporting such failures to a base station only when neither process is active, allowing efficient communication control through Uu and indirect paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal apparatus reports radio link failure immediately upon detection, then the base station can quickly respond to the failure, but it may cause unnecessary signaling overhead and interfere with ongoing path change procedures
Solution Approach 1:
The terminal apparatus checks whether path change or path addition procedures are already ongoing before reporting radio link failure. This preliminary check prevents unnecessary failure reports when the base station is already taking corrective actions, thereby reducing signaling overhead while maintaining reliable failure detection
Solution Approach 2:
The terminal apparatus provides feedback to the base station about the status of path change and path addition procedures. This feedback mechanism allows the base station to understand whether reported failures are genuine or already being addressed, improving overall communication control efficiency
2Device complexity
If the terminal apparatus waits to report radio link failure until path change procedures complete, then unnecessary reports are reduced, but the response time to actual failures may be delayed
Solution Approach 1:
The terminal apparatus performs a preliminary check of ongoing procedures before reporting failure. If no path change or path addition is ongoing, the failure is reported immediately, ensuring fast response. If such procedures are ongoing, the report is deferred, reducing unnecessary signaling
Solution Approach 2:
The failure reporting mechanism is made dynamic by adjusting the reporting timing based on the current system state. The terminal apparatus adapts its reporting behavior according to whether path change procedures are ongoing, optimizing both response speed and signaling efficiency
3Reliability
If multi-path relay communication is implemented, then communication reliability is improved through redundant paths, but the complexity of managing direct and indirect paths increases
Solution Approach 1:
The communication path is segmented into direct path and indirect path components. The terminal apparatus independently manages each path type, checking the status of path change and path addition procedures separately before reporting failures. This segmentation simplifies the management complexity while maintaining the reliability benefits of multi-path communication
Solution Approach 2:
The terminal apparatus acts as an intermediary that monitors both direct and indirect paths and coordinates failure reporting. By centralizing the decision-making logic for failure reporting at the terminal apparatus, the complexity of path management is reduced while maintaining communication reliability through redundant paths
Data Source
AI summary
A terminal apparatus configured to communicate with a base station apparatus includes a transmitter and a processing unit, in which the processing unit determines whether a procedure of changing an indirect path and a procedure of adding the indirect path are ongoing in a case that a radio link failure of a direct path is detected, the transmitter reports the radio link failure of the direct path to the base station apparatus, based on the processing unit determining that neither the procedure of changing the indirect path nor the procedure of adding the indirect path is ongoing, the direct path is a path connected to the base station apparatus via a Uu interface, and the indirect path is a path connected to the base station apparatus via a relay terminal apparatus.