Sidelink Relay System Information Path Selection
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Solution Overview
Problem
In NR sidelink relay systems, remote UEs face challenges in handling system information (SI) received via different paths, leading to conflicts and difficulties in selecting the appropriate SIBs due to differing parameters and availability, especially when connected to multiple cells via relay UEs, which can result in inefficient path utilization and potential overload on interfaces.
Innovation Solution
The solution involves monitoring and comparing SI blocks received via different paths, allowing the remote UE to select the most suitable path based on prioritization decisions or generating a cut-set SIB from received information to ensure seamless operation, with mechanisms for prioritizing paths and resolving conflicts, and incorporating new information elements within SIBs to assist in path selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If remote UE receives system information blocks via multiple paths (direct Uu interface and indirect PC5 interface through relay UE), then path selection flexibility and network reliability are improved, but information conflict and selection complexity increase
Solution Approach 1:
The patent introduces prioritization indicators as intermediary elements that mediate between multiple SI reception paths. These indicators (received via Uu interface from serving cell or PC5 interface from relay UE) act as decision-making assistants that resolve conflicts without requiring complex UE-side analysis, thereby maintaining reliability while reducing selection complexity.
Solution Approach 2:
The patent implements feedback mechanisms where prioritization information is provided back to the UE through both Uu and PC5 interfaces. This feedback loop allows the network and relay UE to guide the UE's path selection based on current network conditions, resource availability, and relay capabilities, enabling intelligent decision-making without increasing UE complexity.
2Adaptability or versatility
If remote UE autonomously compares and selects paths based on SIB content, then selection adaptability is improved, but processing overhead and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by having the network and relay UE pre-configure prioritization indicators before the UE needs to make path selection decisions. These indicators are provided in advance through SIB1 or dedicated signaling, allowing the UE to simply follow pre-determined priorities rather than performing energy-consuming autonomous comparisons and analyses.
Solution Approach 2:
The patent enables self-service through autonomous path selection mechanisms where the UE can independently determine path priorities based on received indicators and pre-configured rules. The UE serves itself by making selection decisions without requiring continuous network intervention or complex real-time analysis, reducing energy consumption while maintaining adaptability.
3Area of stationary object
If remote UE receives system information via relay UE, then coverage extension is improved, but interface overload on PC5 increases
Solution Approach 1:
The patent introduces dynamic path selection where the UE can switch between direct Uu interface reception and indirect PC5 interface reception based on real-time conditions. When direct network coverage is available, the UE receives SI via Uu interface, reducing PC5 interface load. When out of coverage, it uses the relay UE via PC5 interface, thereby dynamically adapting to maintain coverage extension while managing interface load.
Solution Approach 2:
The patent applies partial action by allowing the UE to selectively receive different types of system information through different paths based on priority and need. Not all SIBs need to be received via the relay UE - the UE can obtain critical information directly from the network when possible, using the relay UE only for coverage extension when necessary, thereby reducing overall PC5 interface load while maintaining coverage benefits.
Data Source
AI summary
It is provided a method comprising: monitoring if a remote terminal receives a first system information block from a first cell via a first path and a second system information block from a second cell via a second path different from the first path; comparing a content of the first system information block with a content of the second system information block if the remote terminal receives the first system information block and the second system information block; selecting one of the first path and the second path based on a result of the comparing; causing the remote terminal to connect via the selected one of the first path and the second path.