Relay Node Discovery for On-Demand Multi-Path UE-to-Network Communication
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Solution Overview
Problem
Existing relay node discovery mechanisms in LTE and NR networks are inefficient, leading to unnecessary signaling overhead and power consumption when multi-path UE-to-network relay is not necessary for high reliability and throughput, and current mechanisms fail to trigger discovery only when feasible and needed.
Innovation Solution
A method for transmitting and receiving multi-path UE-to-network relay discovery messages with specific information indicators, triggered by criteria such as signal quality thresholds and QoS requirements, to establish multi-path communication only when necessary, reducing unnecessary signaling and optimizing resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay node discovery is continuously performed using existing mechanisms, then relay path availability is improved, but signaling overhead and power consumption increase unnecessarily
Solution Approach 1:
The discovery mechanism transitions from static continuous operation to dynamic triggered operation. Discovery messages are transmitted only when triggering criteria are met (e.g., direct path quality deteriorates below threshold, high reliability traffic arrives), adapting the system behavior to actual network conditions and traffic requirements rather than operating continuously
Solution Approach 2:
The system changes the operational parameters of discovery based on traffic requirements and channel conditions. When high reliability/throughput traffic is detected or direct path quality degrades, discovery is activated; otherwise it remains inactive, dynamically adjusting the discovery behavior to match actual needs
2Reliability
If multi-path relay is always established, then communication reliability is improved, but signaling overhead increases without clear benefit
Solution Approach 1:
The system dynamically changes the path configuration parameter based on traffic requirements. When traffic requiring high reliability and throughput is detected, multi-path relay is established; otherwise single-path operation is maintained, avoiding unnecessary signaling for relay setup when it provides no benefit
Solution Approach 2:
The relay path configuration transitions from static always-on to dynamic on-demand. The system adapts between single-path and multi-path operation based on real-time assessment of traffic requirements and channel conditions, establishing relay paths only when they provide actual benefit
3Reliability
If discovery messages are transmitted without triggering criteria, then relay discovery coverage is improved, but unnecessary discovery operations increase power consumption
Solution Approach 1:
The discovery operation transitions from static continuous transmission to dynamic triggered transmission. Messages are sent only when specific triggering criteria are met (direct path quality threshold, high reliability traffic arrival), making the system adaptive to actual conditions rather than operating continuously at full coverage
Data Source
AI summary
Embodiments of the present disclosure provide method and apparatus for relay node discovery. A method performed by a first UE comprises transmitting a multi path UE-to-network relay discovery message. The multi path UE-to-network relay discovery message comprises first information indicating that the multi path UE-to-network relay discovery message is specific for multi-path UE-to-network relay communication or a specific kind of multi-path UE-to-network relay communication. The method may further comprise, when a candidate relay UE is able to act as a relay UE used for the multi-path UE-to-network relay communication or the specific kind of multi-path UE-to-network relay communication, receiving a multi path UE-to-network relay discovery response message from the candidate relay UE.