Relay UE RRC Status Indicator for Wireless Link Management
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Solution Overview
Problem
Conventional wireless communication systems face challenges in managing relay connections efficiently, particularly in switching between direct and indirect communication links and in selecting optimal relay devices based on their RRC connection status, which affects latency and reliability.
Innovation Solution
A relay UE device transmits an RRC connection status indicator to a serving base station, allowing remote UE devices to manage relay communication by prioritizing candidate relay devices based on their connection status and measured Sidelink Discovery Reference Signal Received Power (SD-RSRP) levels, enabling efficient switching and reselection of relay links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE devices transmit RRC connection status indicators and remote UE devices prioritize relay selection based on connection status, then communication reliability is improved, but device complexity and message exchange overhead increase
Solution Approach 1:
The patent extracts the RRC connection status information from the complete relay selection criteria, focusing only on the connection status indicator rather than evaluating all possible relay parameters. This selective extraction of critical information reduces the complexity of relay selection while maintaining reliability by prioritizing relays with established RRC connections.
Solution Approach 2:
The patent implements preliminary action by having relay UE devices proactively transmit their RRC connection status indicators before being selected as relays. This advance information availability allows remote UE devices to make informed relay selection decisions without requiring complex real-time evaluations, thereby improving reliability while reducing operational complexity.
2Measurement precision
If remote UE devices perform measurement reports for all candidate relay devices, then relay selection accuracy is improved, but latency increases due to additional message exchanges
Solution Approach 1:
The patent extracts only the essential RRC connection status indicator from the full set of measurement data that would otherwise be collected. By focusing measurements on relays with confirmed RRC connections rather than evaluating all candidate relays comprehensively, the system achieves sufficient selection accuracy while significantly reducing the time required for measurement and reporting.
Solution Approach 2:
The patent applies partial action by performing measurements and generating measurement reports only for relay devices that have transmitted RRC connection status indicators, rather than measuring all potential candidate relays. This selective measurement approach maintains adequate relay selection accuracy while reducing latency by eliminating unnecessary measurement and reporting steps for relays without established connections.
3Ease of operation
If relay reselection is performed without considering RRC connection status, then device operation simplicity is maintained, but connection stability deteriorates
Solution Approach 1:
The patent implements preliminary action by having relay devices pre-transmit their RRC connection status indicators before reselection decisions are made. This advance information provision allows the reselection process to remain simple and straightforward while ensuring that only relays with stable RRC connections are selected, thereby maintaining both ease of operation and connection stability.
Data Source
AI summary
A relay user equipment (UE) device transmits a Radio Resource Control (RRC) connection status indicator indicating the RRC connection status of the relay UE device to a serving base station. The RRC connection status indicator may be used by a remote UE device to manage relay communication to the base station. In one example, a remote UE device in direct communication with the base station transmits a measurement report to the base station where the measurement report includes measurements only for relay UE devices reporting a RRC connected (RRC CONN) status. The base station manages direct to indirect communication switching at least partially based on the measurement report. In another example, a remote UE device manages relay reselection using a relay candidate prioritization at least partially based on the connection status of candidate relay UE devices.