D2D Synchronization Signal Selection Using Hop Count and Quality
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Solution Overview
Problem
In device-to-device (D2D) communication, existing methods for synchronization signal selection are inadequate as they rely solely on hop count values, which do not accurately reflect the quality of synchronization signals, leading to inappropriate synchronization signal selection when multiple signals with the same hop count are available.
Innovation Solution
A method for selecting synchronization signals in D2D communication that considers both hop count values and signal quality information of current and previous hops, allowing for the selection of optimized synchronization signals based on reference values and accumulated reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If synchronization signal selection relies solely on hop count values, then the selection process is simple, but the synchronization accuracy deteriorates when multiple signals with the same hop count are available
Solution Approach 1:
The patent changes the selection parameters from solely hop count to a composite metric incorporating both hop count and signal quality information (RSRP, RSQR). This allows the system to maintain simple hop count comparison while adding signal quality as a tie-breaking parameter, thus improving synchronization accuracy without significantly increasing complexity
Solution Approach 2:
The patent performs preliminary measurement and accumulation of signal quality information (RSRP, RSQR) for each hop before final synchronization signal selection. This preliminary action ensures that when multiple signals have the same hop count, the system already has the necessary quality metrics to make an accurate selection
2Ease of operation
If only hop count values are considered for synchronization signal selection, then the selection criteria are straightforward, but the reliability of synchronization deteriorates due to inadequate quality assessment
Solution Approach 1:
The patent implements feedback mechanisms where signal quality information (RSRP, RSQR) is measured and accumulated for each hop, then fed back into the selection process. This feedback loop ensures that the selection criteria remain straightforward (comparing composite metrics) while significantly improving reliability through informed decision-making based on actual signal quality
Solution Approach 2:
The patent creates a composite selection metric that combines hop count values with signal quality information (RSRP, RSQR). This composite approach is analogous to composite materials, where multiple properties are combined to achieve superior overall performance - in this case, maintaining simplicity while enhancing reliability
3Measurement precision
If signal quality information of current and previous hops is considered, then the synchronization accuracy is improved, but the processing complexity increases
Solution Approach 1:
The patent performs preliminary measurement and accumulation of signal quality information (RSRP, RSQR) for each hop during the signal reception process. This preliminary action ensures that when synchronization signal selection is needed, the quality metrics are already computed and stored, reducing the processing complexity at the decision-making stage while maintaining high synchronization accuracy
Data Source
AI summary
An embodiment according to the present invention, with respect to a method for a terminal for acquiring device-to-device synchronization, comprises the steps of: receiving from two or more nodes, synchronization signals comprising hop count values; and selecting from among the synchronization signals a synchronization signal to be used for acquiring synchronization, wherein if the hop count values of the synchronization signals received from two or more nodes are different, then the synchronization signal with the lowest hop count value is selected as the synchronization signal to be used in acquiring synchronization, and if the hop count values are the same, then the synchronization signal to be used for acquiring synchronization is selected by utilizing information regarding the signal qualities of the current hop and the previous hop.