D2D Synchronization Signal Segmentation for Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE-based user direct-connection communication, synchronization signals transmitted by terminals of different D2D types interfere with each other, leading to poor communication quality and potential communication failures.
Innovation Solution
A method where a first terminal transmits a synchronization signal according to a determined D2D type, and a second terminal detects and receives only synchronization signals corresponding to its own D2D type, avoiding interference and ensuring correct and efficient user direct-connection communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminals transmit synchronization signals without distinguishing D2D types, then all terminals can potentially synchronize, but synchronization signals of different D2D types interfere with each other causing poor communication quality
Solution Approach 1:
The patent segments synchronization signals into different types (D2D discovery synchronization signals and D2D communication synchronization signals) based on the D2D type. Terminals transmit and detect only the synchronization signal type corresponding to their D2D type, preventing interference between different D2D types while maintaining reliable communication.
2Reliability
If terminals detect all synchronization signals regardless of type, then synchronization coverage is maximized, but detection complexity and power consumption increase
Solution Approach 1:
The patent divides synchronization detection into separate processes for different D2D types. Each terminal is configured to detect only the synchronization signal type corresponding to its D2D type, reducing detection complexity and power consumption while ensuring adequate synchronization coverage for the specific application.
Solution Approach 2:
The patent applies different detection strategies tailored to each terminal's specific D2D type. Discovery terminals detect discovery synchronization signals while communication terminals detect communication synchronization signals, optimizing detection resources for each local requirement.
3Productivity
If terminals transmit synchronization signals without type distinction, then resource utilization is simplified, but power consumption increases due to transmitting unnecessary signals
Solution Approach 1:
The patent segments the transmitting function by D2D type, where terminals transmit only the synchronization signal type corresponding to their intended use. Discovery terminals transmit only discovery synchronization signals and communication terminals transmit only communication synchronization signals, reducing power consumption by eliminating unnecessary signal transmissions.
Data Source
Figure 1~3
Figure 4~6
Figure 6a~7a
AI summary
Embodiments of the present invention disclose a method and an apparatus for transmitting a synchronization signal. The method of the present invention includes: determining, by a first terminal, a D2D type, where the D2D type includes D2D discovery and D2D communication; and transmitting, by the first terminal, a synchronization signal according to the determined D2D type. Therefore, synchronization signals transmitted by terminals of different D2D types do not affect each other, avoiding that a second terminal detects and receives a synchronization signal that does not correspond to a D2D type of the second terminal and ensuring that user direct-connection communication can be performed correctly and efficiently.