Terminal Relay Signaling for Direct Path Radio Link Failure
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Solution Overview
Problem
Existing communication systems in cellular mobile communication, particularly in 5G NR, face inefficiencies in managing direct and indirect paths for terminal apparatuses, especially when radio link failures occur without split bearers, leading to suboptimal communication control.
Innovation Solution
A terminal apparatus is designed to handle both direct and indirect paths, detecting radio link failures on the direct path and, if a signaling radio bearer is not configured as a split bearer, determining if it can be configured on the indirect path and transmitting information about the failure via the signaling radio bearer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal apparatus uses only direct path communication with base station, then communication simplicity is maintained, but communication reliability deteriorates when radio link failure occurs on the direct path
Solution Approach 1:
The patent introduces a relay terminal apparatus as an intermediary node between the terminal apparatus and base station. When direct path communication fails, the relay terminal provides an indirect communication path, thereby improving communication reliability without requiring the terminal apparatus to directly manage complex multi-path routing itself
Solution Approach 2:
The patent implements dynamic path selection and switching mechanisms where the terminal apparatus can transition between direct path and indirect path (via relay terminal) based on real-time radio link conditions. This dynamic adaptation allows the system to maintain reliability while managing complexity through conditional activation rather than permanent multi-path configuration
2Adaptability or versatility
If split bearer configuration is used for signaling radio bearer, then communication control flexibility is improved, but device complexity increases
Solution Approach 1:
The patent applies different bearer configurations to different communication paths locally. The signaling radio bearer can be configured separately for direct path and indirect path, allowing optimized control flexibility for each path type without requiring complex split bearer configurations across all paths. This local differentiation achieves adaptability while reducing overall system complexity
3Productivity
If the terminal apparatus transmits failure information via signaling radio bearer on indirect path, then communication control efficiency is improved, but processing time increases
Solution Approach 1:
The patent establishes signaling radio bearer configurations in advance on both direct and indirect paths before radio link failure occurs. This preliminary setup ensures that when failure happens, the terminal apparatus can immediately transmit failure information through the pre-configured indirect path without experiencing configuration delays, thus improving control efficiency while minimizing additional processing time
Data Source
AI summary
A terminal apparatus for communicating with a base station apparatus by using a direct path and an indirect path determines whether a signaling radio bearer is configured on an indirect path in a case that radio link failure is detected on the direct path, and transmits information indicating that the radio link failure has occurred on the direct path via the signaling radio bearer in a case that the signaling radio bearer is determined to be configured on the indirect path.