Time Division Multiplexing Synchronization Channels Millimeter Wave
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently processing and transmitting synchronization signals due to high path loss and non-line-of-sight losses in millimeter wave frequencies, which affect synchronization channel transmission and reception.
Innovation Solution
Implementing time-division multiplexing of synchronization signals at base stations to process and transmit synchronization signals in synchronization subframes, avoiding frequency-division multiplexing with data signals, and using beamforming to steer signals in different directions to compensate for path loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency-division multiplexing is used to transmit synchronization signals and data signals simultaneously, then spectral efficiency is improved, but peak-to-average-power-ratio advantage is lost and transmission reliability deteriorates in millimeter wave environments
Solution Approach 1:
The patent segments the transmission of synchronization signals and data signals into different time resources (synchronization subframes vs. data subframes). This time-division separation ensures that synchronization signals are transmitted without concurrent data signals, preserving the peak-to-average-power-ratio advantage and transmission reliability in millimeter wave environments, while still achieving high spectral efficiency through efficient time resource utilization.
2Reliability
If synchronization signals are transmitted in every subframe to ensure continuous synchronization, then synchronization reliability is improved, but system complexity and resource overhead increase
Solution Approach 1:
The patent implements periodic transmission of synchronization signals at specific intervals (e.g., every 5ms or 10ms) rather than in every subframe. This periodic approach maintains sufficient synchronization reliability for mobile devices while significantly reducing system complexity and resource overhead compared to continuous transmission in every subframe.
3Reliability
If beamforming is used to compensate for path loss in millimeter wave frequencies, then transmission reliability is improved, but device complexity and processing requirements increase
Solution Approach 1:
The patent performs beamforming operations in advance during synchronization signal transmission, establishing reliable beam patterns before data transmission begins. This preliminary beamforming approach ensures that the base station has already optimized signal directionality and compensated for millimeter wave path loss, simplifying subsequent data transmission processing while maintaining high transmission reliability.
Data Source
AI summary
The apparatus may be a base station. The apparatus processes a first group of synchronization signals. The apparatus processes a second group of synchronization signals. The apparatus performs a first transmission by transmitting the processed first group of the synchronization signals in a first synchronization subframe. The apparatus performs a second transmission by transmitting the processed second group of the synchronization signals in a second synchronization subframe.