Communication method and communication system using two-dimensional primary synchronization signals
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Solution Overview
Problem
Existing wireless communication technologies face challenges in accurately estimating timing and frequency offsets during initial synchronization and cell identification using primary synchronization signals, particularly in 5G New Radio (NR) technology, leading to inefficiencies in cell search and error detection.
Innovation Solution
Employing two-dimensional primary synchronization signals (PSSs) generated from sets of Golay complementary or zero-correlation zone complementary arrays, which are adapted for OFDM symbols and subcarrier signals, to enhance synchronization and cell identification by utilizing synchronization signal blocks with improved correlation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional one-dimensional PSS is used for cell search and initial synchronization, then the device complexity is low, but the measurement precision of timing offset and frequency offset estimation deteriorates
Solution Approach 1:
The patent transforms the conventional one-dimensional PSS into a two-dimensional structure by mapping synchronization sequences onto both time-domain OFDM symbols and frequency-domain subcarriers. This dimensional expansion enables simultaneous estimation of timing offset (from time-domain correlation) and frequency offset (from frequency-domain correlation), thereby improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The two-dimensional PSS is segmented into multiple orthogonal components distributed across different OFDM symbols and subcarriers. Each segment contributes to specific correlation properties, allowing the system to separately estimate timing and frequency offsets through targeted correlation operations on different segments, thus enhancing estimation precision while maintaining manageable complexity
2Reliability
If conventional synchronization signals are used, then the ease of operation is maintained, but the reliability of error detection and cell identification deteriorates
Solution Approach 1:
The two-dimensional PSS structure enables feedback mechanisms where correlation results from time-domain processing provide timing offset estimates that are used to refine frequency-domain correlation for frequency offset estimation, and vice versa. This iterative feedback between time and frequency domain processing enhances reliability of error detection and cell identification
Solution Approach 2:
The synchronization signal combines multiple orthogonal sequences with distinct correlation properties into a composite two-dimensional structure. Different sequence components are assigned to different time-frequency resources, creating a composite signal that simultaneously provides robust timing synchronization, frequency synchronization, and cell identification capabilities, thereby improving reliability
3Speed
If traditional PSS structure is employed, then the productivity of cell search process is adequate, but the speed of simultaneous timing and frequency offset estimation deteriorates
Solution Approach 1:
The two-dimensional PSS structure is pre-designed with orthogonal components that are specifically configured to enable parallel correlation operations. Time-domain correlation and frequency-domain correlation can be performed simultaneously on different orthogonal components, allowing preliminary estimation of both timing and frequency offsets in parallel, thereby increasing estimation speed without reducing cell search throughput
Data Source
AI summary
A communication method and communication system using two-dimensional primary synchronization signals are provided. The communication system includes a base station and a user equipment. The communication method includes: providing a two-dimensional synchronization array collection having a zero correlation zone; generating plural primary synchronization signals (PSSs) in accordance with the two-dimensional synchronization array collection; generating a synchronization signal block (SSB) in accordance with the primary synchronization signals, in which the synchronization signal block is adapted for new radio (NR) technology, and each one of the primary synchronization signals corresponds to plural orthogonal frequency division multiplexing (OFDM) symbols and plural subcarrier signals; and performing a communication operation by using the synchronization signal block.