D2D Synchronization Signal Mapping for Discovery and Communication
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Solution Overview
Problem
In wireless communication systems, particularly in device-to-device (D2D) communication, existing methods face challenges in efficiently distinguishing and synchronizing discovery and communication signals due to their different periodicities and resource allocations, leading to potential synchronization issues and errors.
Innovation Solution
The method involves mapping a first synchronization signal for discovery and a second synchronization signal for communication to distinct subframes, allowing them to be distinguished based on symbol positions or sequences, ensuring accurate synchronization for both types of signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single synchronization signal is used for both discovery and communication signals, then the system structure is simplified, but synchronization accuracy deteriorates due to different periodicities and resource allocations
Solution Approach 1:
The patent segments the synchronization signal into two distinct types: first synchronization signals for discovery signals and second synchronization signals for communication signals. This segmentation allows each synchronization signal to be optimized for its specific purpose with appropriate periodicity and resource allocation, thereby maintaining synchronization accuracy while managing system complexity through structured differentiation.
Solution Approach 2:
The patent applies local quality by assigning different properties to synchronization signals based on their specific functions. Discovery synchronization signals have different periodicities and resource allocations compared to communication synchronization signals, allowing each to be locally optimized for its specific requirement rather than using a uniform approach.
2Measurement precision
If separate synchronization signals are used for discovery and communication, then synchronization accuracy is improved, but device complexity increases due to multiple signal types and resource allocations
Solution Approach 1:
The patent implements a unified synchronization framework where both first and second synchronization signals follow similar processing and transmission protocols. This multi-functionality approach allows the system to handle different synchronization requirements through a common structural paradigm, reducing the effective complexity increase that would otherwise result from completely separate signal handling mechanisms.
Solution Approach 2:
The patent introduces an additional dimension of differentiation through resource allocation and periodicity parameters rather than creating fundamentally different signal structures. By varying these dimensional parameters, the system achieves the needed distinction between discovery and communication synchronization without substantially increasing overall system complexity.
3Adaptability or versatility
If synchronization signals are transmitted with different periodicities, then specific signal requirements are met, but signal differentiation becomes difficult leading to synchronization errors
Solution Approach 1:
The patent employs sequence differentiation as a form of signal identification, where first and second synchronization signals use distinct sequences or patterns. This allows receiving devices to reliably distinguish between discovery and communication synchronization signals even when transmitted with different periodicities, thereby maintaining synchronization reliability while preserving the adaptability needed for different signal requirements.
Data Source
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AI summary
The present invention relates to a wireless communication system, more particularly, to a method for transmitting and receiving a synchronization signal by a transmission terminal in a wireless communication system supporting device-to-device (D2D) communication. A method for transmitting a synchronization signal according to an embodiment of the present invention comprises the steps of: mapping a first synchronization signal for a discovery signal to a first sub-frame and transmitting the first synchronization signal in the first sub-frame; mapping a second synchronization signal for a communication signal to a second sub-frame and transmitting the second synchronization signal in the second sub-frame, Herein, the first synchronization signal and the second synchronization signal can be distinguished on the basis of the mapped symbol position or sequence in the sub-frame.