D2D Synchronization Signal Root Index Segmentation
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Solution Overview
Problem
In emergency situations where cellular network service is unavailable, device-to-device (D2D) communication systems face challenges in acquiring synchronization signals, hindering effective wireless communication between devices.
Innovation Solution
A method and device for generating a Device-to-Device Synchronization Signal (D2DSS) that allows terminals to distinguish between different timing references, enabling efficient selection of a suitable synchronization signal by using distinct root indices and combination values based on the terminal's coverage status relative to a base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a terminal uses a single unified synchronization signal design, then the system complexity is reduced, but the ability to distinguish between different timing references (in-coverage vs. out-of-coverage terminals) is lost
Solution Approach 1:
The patent applies local quality by making different parts of the synchronization signal have different properties based on the terminal's coverage status. Specifically, in-coverage terminals use root indices 0-29 while out-of-coverage terminals use root indices 30-59, creating locally differentiated signal characteristics that encode timing reference type information without increasing overall system complexity
2Loss of information
If the patent uses different root indices and combination values for in-coverage and out-of-coverage terminals, then the ability to distinguish timing reference types is improved, but the device complexity increases
Solution Approach 1:
The patent changes parameters (root index and combination value) of the synchronization signal based on the terminal's coverage status. By selecting from predefined parameter sets (in-coverage: root indices 0-29, out-of-coverage: root indices 30-59), the system encodes timing reference type information while maintaining manageable device complexity through standardized parameter selection
3Measurement precision
If terminals in emergency situations rely on base station coverage for synchronization, then synchronization accuracy is maintained, but communication reliability fails when base station coverage is unavailable
Solution Approach 1:
The patent segments the synchronization signal space into distinct regions for in-coverage and out-of-coverage terminals. This segmentation allows out-of-coverage terminals to independently acquire synchronization using dedicated root indices (30-59) and combination values, ensuring communication reliability in emergency situations while maintaining synchronization accuracy through structured signal design
Solution Approach 2:
The synchronization signal acts as an intermediary that carries timing reference type information through its root index and combination value. This intermediary mechanism enables terminals to automatically identify whether they are in-coverage or out-of-coverage and select appropriate timing references, bridging the gap between network-dependent and independent synchronization modes
Data Source
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AI summary
Provided is a method of generating a Device-to-Device Synchronization Signal (D2DSS) by a terminal according to an embodiment of the present disclosure. The method includes determining a service attribute for identifying whether the terminal is serviced by at least one base station; and generating a D2DSS for identifying whether the terminal is serviced by the base station, based on the determination result. In addition, provided is a method of configuring D2D synchronization by a terminal according to an embodiment of the present disclosure. The method includes receiving a signal from at least one base station or another device; determining whether a synchronization signal is detected from the received signal; and when the synchronization signal is detected, configuring synchronization with the another device based on the timing reference of the detected synchronization signal.