D2D Relay Replacement via Control Node Indication
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Solution Overview
Problem
Existing Device-to-Device (D2D) technology lacks a solution for replacing relay UE when conditions change, such as movement, disrupting smooth D2D communication.
Innovation Solution
A method and system for replacing a relay UE, where a control node sends a relay replacing indication to the first D2D UE, allowing it to perform communication via a replacement D2D relay, including updating relay information and determining the suitable replacement relay based on measured parameters and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a D2D UE uses a relay UE for communication in weak coverage areas, then coverage extension and communication capability are improved, but the system lacks a mechanism to handle relay replacement when the relay UE moves or conditions change, leading to communication disruption
Solution Approach 1:
The network pre-configures multiple candidate relay UEs for each D2D UE before actual relay replacement is needed. When relay replacement becomes necessary, the D2D UE can immediately switch to a pre-selected candidate relay without undergoing complex discovery and selection procedures, thus maintaining communication continuity while adapting to relay UE movement or condition changes
Solution Approach 2:
The system implements continuous monitoring of relay UE conditions (signal quality, mobility status, availability) and triggers relay replacement when predefined thresholds are violated. This feedback mechanism ensures that relay replacement occurs proactively before communication disruption, balancing reliability maintenance with adaptive response to changing conditions
2Reliability
If the relay UE is replaced when D2D UE or relay UE position changes, then communication robustness is improved, but the complexity of relay management and control signaling increases
Solution Approach 1:
The network controller (e.g., eNodeB or ProSe function) acts as an intermediary that centralizes relay management functions. It monitors relay UE conditions, selects appropriate candidate relays, and coordinates the replacement process, thereby reducing the complexity burden on individual D2D UEs and relays while maintaining robust communication through systematic relay replacement
3Device complexity
If existing D2D technology is used without relay replacement mechanism, then system simplicity is maintained, but smooth D2D communication cannot be ensured when relay conditions change
Solution Approach 1:
The relay replacement functionality is segmented into distinct modules: relay condition monitoring, candidate relay selection, replacement decision making, and execution. This modular approach allows the system to maintain overall simplicity while incorporating sophisticated relay replacement capabilities where needed, ensuring smooth communication without overwhelming system complexity
Data Source
AI summary
A method for replacing a relay, comprising: a first D2D UE receives D2D relay node replacement indication information transmitted by a control node; and the first D2D UE communicates, according to the D2D relay node replacement indication information, through a new D2D relay node. Also disclosed are another method and system for replacing a relay node, a D2D UE and a control node.