Synchronization Signal Collision Detection in Direct Networks
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Solution Overview
Problem
In talk-around direct communication networks, existing methods fail to prevent collisions between synchronization signals, leading to synchronization failures and degraded communication performance.
Innovation Solution
A method and apparatus that detect collisions by determining a synchronization reception window, selecting a synchronization slot, transmitting a synchronization signal, and comparing signal intensity to determine collision occurrence, allowing terminals to adjust their transmission based on priority information and signal intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If terminals transmit synchronization signals in vacant slots, then the utilization of available time resources is improved, but synchronization signal collisions cannot be prevented
Solution Approach 1:
The patent applies preliminary action by having terminals perform collision detection before transmitting synchronization signals. Terminals monitor designated reception windows to check if other terminals are transmitting synchronization signals, and only transmit if the channel is clear. This advance checking prevents collisions while maintaining efficient use of time resources.
Solution Approach 2:
The patent implements feedback mechanisms where terminals continuously monitor synchronization reception windows and adjust their transmission behavior based on detected signals. When a terminal detects a synchronization signal from another terminal during the monitoring period, it feedback-controls its own transmission to avoid collision, thereby resolving the contradiction between resource utilization and collision prevention.
2Measurement precision
If terminals continuously monitor for synchronization signals, then collision detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by configuring terminals to monitor synchronization signals only during specific reception windows rather than continuously. These reception windows are periodically occurring time intervals where terminals activate their receivers to detect synchronization signals, then enter low-power mode between windows. This approach maintains collision detection accuracy while significantly reducing energy consumption compared to continuous monitoring.
Data Source
AI summary
A method and apparatus for transmitting a synchronization signal in a talk-around direct communication network is provided. The method includes: determining one of a plurality of second windows included in a first window as a synchronization reception window; selecting one of a plurality of synchronization slots included in the second windows as a first synchronization slot; transmitting a first synchronization signal through the first synchronization slot included in the second windows, excluding the synchronization reception window; detecting a second synchronization signal transmitted from other terminals using the first synchronization slot included in the synchronization reception window; and determining that a collision from amongst the synchronization signals has occurred based on the detection result.