SRB1 Path Configuration for PC5 Relay UE State Triggering
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Solution Overview
Problem
In the R18 multipath establishment process, relay UE fails to enter a connected state due to direct transmission of SRB1 messages, preventing effective relay services for remote UE.
Innovation Solution
The first UE determines the transmission path configuration of SRB1 to decide whether to send a PC5 RRC message to trigger the relay UE's connected state, using either the R17 method for indirect paths or a new PC5 RRC procedure for direct paths, ensuring timely state transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SRB1 carrying RRC message is transmitted directly on the direct link, then transmission efficiency is improved, but the relay UE cannot be triggered to enter connected state to provide relay services
Solution Approach 1:
The patent segments the transmission path into direct link and indirect link, and segments the RRC message transmission into two scenarios: when indirect path is configured, send PC5 RRC message to trigger relay UE; when only direct path is configured, send RRC message directly. This segmentation allows the system to choose the appropriate transmission mode based on path configuration, resolving the contradiction between transmission efficiency and relay service availability.
Solution Approach 2:
The patent introduces a preliminary action by determining the transmission path configuration of SRB1 before sending the RRC message. Based on this preliminary determination, the system decides whether to send a PC5 RRC message to trigger the relay UE in advance. This preliminary action ensures that the relay UE is properly activated before actual data transmission, maintaining reliability while allowing efficient direct transmission when applicable.
2Reliability
If relay UE is triggered to enter connected state for multipath establishment, then relay service reliability is improved, but transmission path complexity increases
Solution Approach 1:
The patent implements a dynamic transmission path configuration mechanism where the system adapts the relay activation status based on the configured paths. When both direct and indirect paths are configured, the relay UE is triggered to enter connected state. When only direct path is configured, the relay UE remains inactive. This dynamic adjustment optimizes the balance between relay service reliability and transmission path complexity by activating relay functionality only when necessary.
Solution Approach 2:
The patent changes the transmission path configuration parameter to control relay UE behavior. By monitoring whether indirect path is configured (parameter change), the system adjusts the relay activation state accordingly. This parameter-driven approach simplifies the management of transmission path complexity while ensuring relay service reliability when needed.
Data Source
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AI summary
This application discloses a path establishment method and apparatus, UE, a network-side device, and a readable storage medium, pertaining to the field of communication technologies. The path establishment method of embodiments of this application includes: determining, by first UE, based on a transmission path configuration of a signaling radio bearer SRB1 carrying Uu signaling, whether to send a PC5 radio resource control RRC message to relay UE, where the PC5 RRC message is used to trigger the relay UE to enter a connected state; where a transmission path corresponding to the transmission path configuration of the SRB1 carrying Uu signaling includes at least one of the following: an indirect path between the first UE and a network-side device, and a direct path between the first UE and the network-side device; where the indirect path includes a PC5 link between the first UE and the relay UE and a Uu link between the relay UE and the network-side device.