Remote UE Synchronization Reference Selection in D2D Relay
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Solution Overview
Problem
In Device-to-Device (D2D) operations within wireless communication systems, synchronization issues between remote UEs and relay UEs can lead to inefficiencies and communication failures, particularly when the relay UE selected for synchronization differs from the synchronization reference UE, resulting in asynchronization and reduced communication efficiency.
Innovation Solution
A method where a remote UE selects a synchronization reference UE based on system information received from candidate relay UEs, prioritizing UEs that are in-coverage, support relay services, and have the highest measured quality, ensuring synchronization within the D2D operation and maximizing communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a remote UE selects a synchronization reference UE independently without considering relay service provision, then the selection process is simple, but asynchronization occurs between the remote UE and relay UE, decreasing D2D operation efficiency
Solution Approach 1:
The remote UE receives system information from candidate relay UEs that includes identification of the relay UE providing relay service. This feedback mechanism allows the remote UE to adjust its synchronization reference UE selection based on the relay service status, ensuring that the selected synchronization reference UE matches the relay UE, thereby preventing asynchronization and maintaining high D2D operation efficiency.
Solution Approach 2:
System information acts as an intermediary carrier that conveys the relay service status from candidate relay UEs to the remote UE. This intermediary information enables the remote UE to make informed decisions about synchronization reference UE selection without complex direct communication protocols, balancing selection simplicity with operational efficiency.
2Adaptability or versatility
If a remote UE selects any candidate UE as synchronization reference, then selection flexibility is high, but communication reliability decreases due to potential asynchronization
Solution Approach 1:
The selection criteria for synchronization reference UE are dynamically adjusted based on the relay service status parameter. The remote UE changes its selection parameters to prioritize UEs that are both providing relay service and capable of synchronization, thereby maintaining selection flexibility while ensuring communication reliability through asynchronization prevention.
3Reliability
If the remote UE prioritizes selecting relay UEs as synchronization reference, then synchronization reliability improves, but the selection criteria become more complex
Solution Approach 1:
The critical attribute of relay service provision is extracted from the complex set of UE characteristics and highlighted in the system information. This extraction allows the remote UE to focus on the most important criterion (relay service status) without needing to evaluate all possible UE parameters, thereby improving synchronization reliability while keeping the selection process relatively simple.
Data Source
AI summary
The present invention provides a device-to-device (D2D) operation method performed by a remote terminal in a wireless communication system, the method comprising receiving system information from candidates of a relay terminal which provides a relay service between a cellular link and a side link; and determining, as a synchronization reference terminal, any one terminal from among the candidate relay terminals on the basis of the system information, wherein the relay terminal of the remote terminal and the synchronization reference terminal is the same.