Remote UE Relay Selection During RRC State Transitions
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Solution Overview
Problem
In wireless communication systems, remote user equipment (UE) faces challenges in selecting and reselecting relay UE efficiently within the sidelink relay architecture, particularly during transitions between RRC states and in scenarios with varying coverage conditions.
Innovation Solution
The method involves user equipment (UE) receiving RRC release messages and performing specific actions based on the presence or absence of a suspend configuration information element, including entering RRC inactive or idle states and initiating cell or relay selection processes. Additionally, the UE evaluates and selects candidate relay UE based on measured signal strengths and radio link failure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If remote UE performs relay selection during RRC state transitions, then relay selection timeliness is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent changes the parameter of RRC state (connected, inactive, idle) to trigger different relay selection behaviors. When transitioning to inactive or idle state, the UE performs relay selection; when in connected state, it does not. This parameter-based control resolves the contradiction by enabling timely selection only when necessary, avoiding unnecessary processing complexity during connected state transitions.
Solution Approach 2:
The patent implements dynamic relay selection behavior that adapts to the current RRC state. The selection process is dynamically enabled or disabled based on state transitions, making the system flexible and context-aware. This dynamic approach ensures timely selection when needed (reducing delay) while avoiding unnecessary processing when not needed (reducing complexity).
2Reliability
If remote UE evaluates multiple relay candidates based on signal strength, then relay selection reliability is improved, but measurement and evaluation overhead increases
Solution Approach 1:
The patent applies partial action by evaluating only the necessary number of relay candidates rather than all possible candidates. The UE measures signal strength of relay candidates and selects based on thresholds, performing measurements only when transitioning to inactive or idle state. This partial evaluation approach maintains reliability by ensuring adequate candidate assessment while reducing unnecessary measurement overhead.
3Productivity
If remote UE triggers relay selection only during specific state transitions, then processing efficiency is improved, but selection responsiveness may deteriorate in other scenarios
Solution Approach 1:
The patent performs relay selection in advance when transitioning to inactive or idle states, before actual communication needs arise. This preliminary action ensures that relay selection is completed proactively, maintaining efficiency by batching selections during state transitions rather than reacting to each communication request individually. The pre-performed selection remains valid for subsequent communications in that state.
Data Source
AI summary
Provided in the present invention are a method performed by user equipment, and user equipment. The method includes: receiving, by the UE, an RRC release message transmitted by a network; and in the case that the RRC release message includes a suspend configuration suspendConfig information element, performing, by the UE, the following first action: if the UE is remote UE, entering, by the UE, an RRC inactive state, and performing cell selection or relay selection, or performing cell selection and relay selection.