PSS Detection in 5G-NR TDD Systems
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Solution Overview
Problem
In 5G-NR communication systems, detecting the primary synchronization signal (PSS) is challenging due to its variable position within the band and the difficulty in applying frequency domain methods, especially in time division duplex (TDD) systems, where cyclic prefix-based symbol boundary detection is not feasible.
Innovation Solution
A synchronization signal detection method that calculates a PSS correlation value, frequency offset, and timing offset using a processor and memory, involving a PSS correlator, frequency offset detector, and timing offset detector to accurately detect the PSS in the time domain, with feedback mechanisms for frequency and timing adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PSS detection is performed in frequency domain using cyclic prefix-based symbol boundary detection, then detection accuracy is improved, but this method cannot be applied in TDD systems where downlink and uplink allocation is flexible
Solution Approach 1:
The patent inverts the conventional detection approach by performing PSS detection in the time domain rather than the frequency domain. The processor calculates correlation values between the received signal and a reference PSS sequence in the time domain, then determines frequency and timing offsets based on these time-domain correlation results, enabling TDD system compatibility while maintaining detection accuracy
Solution Approach 2:
The patent changes the domain parameter from frequency domain to time domain for PSS detection. By computing correlation values in the time domain and deriving frequency offset information from time-domain signal characteristics, the method adapts the detection parameters to suit TDD system requirements where frequency-domain methods are inapplicable
2Ease of operation
If PSS position is fixed at the center of the band as in LTE, then detection simplicity is maintained, but PSS cannot adapt to variable positions required by 5G-NR SA and NSA standards
Solution Approach 1:
The patent implements dynamic PSS position detection by scanning multiple frequency positions across the band. The processor calculates correlation values at different frequency offsets and identifies the position with the maximum correlation, allowing the PSS detection method to adapt to variable PSS positions in both SA and NSA modes while maintaining a unified detection procedure
Solution Approach 2:
The patent creates a universal PSS detection method that works for both SA and NSA standards. By using time-domain correlation that can search across the entire frequency band, the same detection algorithm handles both fixed-center and variable-position PSS scenarios, as well as both SA and NSA configurations, without requiring separate detection procedures
3Area of stationary object
If extensive PSS detection across the entire band is performed, then detection coverage is improved, but detection time and computational complexity increase
Solution Approach 1:
The patent segments the frequency band into multiple candidate positions for PSS detection. Instead of uniformly scanning the entire band, the method divides the search space into discrete frequency offset positions based on the expected PSS location patterns in SA and NSA modes, reducing the number of correlation calculations required while maintaining comprehensive coverage
Solution Approach 2:
The patent performs preliminary frequency offset estimation before detailed PSS correlation detection. By first identifying candidate frequency positions using coarse correlation or frequency offset detection, the system narrows down the search range, allowing subsequent fine-grained PSS detection to focus only on likely positions, thereby reducing overall detection time
Data Source
AI summary
Provided are a synchronization signal detection method performed by a receiver including a processor and a memory, the synchronization signal detection method comprises calculating a PSS correlation value for a primary synchronization signal (PSS) included in a received signal, detecting a frequency offset for the PSS and a timing offset for sampling timing of the received signal and detecting the PSS based on the PSS correlation value, the frequency offset, and the timing offset.