D2D Synchronization Reference Selection Using Device Characteristics
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Solution Overview
Problem
Existing D2D communication systems face challenges in selecting a synchronization reference when multiple UEs have the same priority level, leading to scalability issues and increased UE complexity, particularly in out-of-coverage scenarios without GNSS or network support.
Innovation Solution
A method where D2D communication devices compare characteristics, such as internal clock quality or number of synchronized devices, to select a synchronization reference when multiple devices have the same priority, enabling synchronization consensus without additional priority levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple UEs with the same priority level are used as synchronization references, then synchronization coverage is improved, but UE complexity and scalability deteriorate
Solution Approach 1:
The patent changes the selection criterion from priority level alone to a combination of priority level and device characteristics (such as internal clock quality). When multiple UEs have the same priority, the receiving UE compares characteristics like clock accuracy to determine which synchronization reference to use, thereby reducing the number of synchronization references a UE needs to process simultaneously
Solution Approach 2:
Each UE autonomously determines its own characteristic parameters (such as internal clock quality) and uses this self-assessed information in the synchronization reference selection process. The UE compares its received synchronization signals against its own characteristic metrics to make independent selection decisions, eliminating the need for complex centralized coordination
2Reliability
If multiple synchronization references are maintained, then synchronization reliability is improved, but loss of information and processing overhead increase
Solution Approach 1:
The patent extracts and transmits specific characteristic information (such as internal clock quality metrics) from the synchronization reference UEs. Instead of processing complete synchronization data from multiple references, UEs exchange and compare only the essential characteristic parameters, reducing information processing overhead while maintaining synchronization reliability
Solution Approach 2:
The patent implements a two-stage selection process: first filter by priority level, then partially compare characteristic parameters only when priority levels are equal. This partial action approach avoids the excessive processing that would result from comparing all parameters from all synchronization references, achieving sufficient reliability without unnecessary processing overhead
Data Source
AI summary
A device-to-device, D2D, communication device (10) receives a first synchronization signal from a first other D2D communication device (10) and receives a second synchronization signal from a second other D2D communication device (10). If the first other D2D communication device (10) and the second other D2D communication device (10) have the same priority level for selection as a synchronization reference, the D2D communication device (10) compares a characteristic of the first other D2D communication device (10) to a characteristic of the second other D2D communication device (10). Based on the comparison, the D2D communication device (10) selects between synchronizing to the first synchronization signal and synchronizing to the second synchronization signal.