5G Synchronization Signal Frequency Offset Beam Detection
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Solution Overview
Problem
The high detection complexity during cell search and synchronization in 5G communications systems, particularly when using massive MIMO and millimeter wave technology, due to the need for a large number of synchronization signal sequences to distinguish between different beams in user access processes.
Innovation Solution
A method where a network device sends a first and second synchronization signal with different frequency offsets within a time unit, allowing a terminal device to determine the optimal transmit beam and time sequence using only these two signals, reducing the complexity of synchronization detection by multiplexing them in the frequency domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large quantity of synchronization signal sequences are used to enable UE to distinguish between different beams, then beam distinction capability is improved, but detection complexity increases
Solution Approach 1:
The patent transitions from using multiple synchronization signal sequences in the time domain to using frequency domain resource allocation. Each beam is assigned a specific frequency domain resource (subcarrier offset), allowing the UE to distinguish beams through frequency domain detection rather than sequence correlation, thereby reducing detection complexity while maintaining beam distinction capability
Solution Approach 2:
The patent changes the parameter used for beam identification from sequence type to frequency domain resource allocation. By assigning different subcarrier offsets to different beams, the system enables beam distinction through frequency position rather than sequence content, simplifying the detection process
2Reliability
If multiple synchronization signals are sent for each beam to ensure coverage, then synchronization reliability is improved, but detection time increases
Solution Approach 1:
The patent moves the multiplexing dimension from time to frequency, allowing multiple beams to be represented simultaneously in the frequency domain within a single time instance. This enables the UE to detect multiple beams in parallel through frequency domain processing, reducing detection time while maintaining synchronization reliability
Data Source
AI summary
Embodiments of this application provide a synchronization processing method and apparatus, and a device. The method includes: sending, by a network device, a first synchronization signal and a second synchronization signal to a terminal device within a first time unit, where frequencies of first synchronization signals in all beams are the same, and each beam has a different difference between the frequency of the first synchronization signal and a frequency of the second synchronization signal; and determining, by the terminal device, an optimal transmit beam of the network device for the terminal device and a time sequence of the optimal transmit beam based on the first synchronization signal and the second synchronization signal. This method effectively reducing synchronization detection complexity of the terminal device.