U2U Relay Discovery for Low-Delay Out-of-Coverage Connectivity
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Solution Overview
Problem
The challenge in wireless communication systems is the efficient discovery and selection of a suitable UE-to-UE relay, particularly in out-of-coverage scenarios, where existing solutions introduce additional delay and lack clear criteria for selecting the appropriate relay UE.
Innovation Solution
A UE configured to operate in sidelink mode transmits a discovery message to identify candidate relay UEs, receives responses indicating their ability to relay messages, and selects a relay based on pre-configured or signaled criteria such as signal strength and load, enabling efficient connection establishment with target UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE transmits a discovery message to find relay UEs in out-of-coverage scenarios, then connectivity is established, but communication delay increases
Solution Approach 1:
The patent applies preliminary action by having UEs pre-configure relay selection criteria and pre-establish discovery message templates before entering out-of-coverage scenarios. This allows the UE to quickly select and communicate with relay UEs without extensive real-time negotiation, thereby reducing communication delay while ensuring connectivity is established.
2Adaptability or versatility
If existing relay discovery methods are used, then relay UEs can be found, but clear selection criteria are lacking
Solution Approach 1:
The patent applies parameter changes by defining specific measurable parameters for relay selection including signal strength thresholds, load capacity metrics, and relay UE capability indicators. These quantifiable parameters transform the vague selection process into a systematic evaluation, making relay selection straightforward while maintaining adaptability to different network conditions.
3Measurement precision
If additional protocol changes are implemented for relay selection, then selection accuracy improves, but system complexity increases
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously perform relay discovery and selection using pre-configured criteria without requiring complex centralized coordination or additional protocol infrastructure. Each UE independently evaluates potential relay UEs based on signal strength, load, and capability parameters, achieving accurate selection while minimizing system complexity.
Data Source
AI summary
Embodiments provide a UE [e.g., source UE] of a wireless [e.g., radio based] communication system [e.g., 5G/NR communication system], wherein the UE is configured to operate in a sidelink mode of operation [e.g., 5G/NR sidelink mode 1 or mode 2], wherein the UE is configured, for establishing a connection with a target UE or a group of target UEs [e.g., the group of target UEs having a group ID] via a UE-to-UE relay, to transmit [e.g., via the sidelink] a discovery message for discovering one or more candidate relay UEs that are connected or able to connect [e.g., via the sidelink] to the target UE or group of target UEs.