5G Synchronization Signal Burst Structure for Frame Acquisition
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Solution Overview
Problem
Current 5G systems face challenges in synchronizing signal bursts and system frame acquisition in new radio (NR) environments, particularly in achieving efficient synchronization and reliable system frame number determination across varying deployment scenarios and frequency bands.
Innovation Solution
The implementation of a synchronization signal (SS) block structure that includes a primary synchronization signal (PSS), secondary synchronization signal (SSS), and Physical Broadcast Channel (PBCH), with specific cyclic shift determinations and scrambling codes to identify cell IDs and system frame numbers, enabling efficient SS burst set composition and construction for NR systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a unified SS burst structure is implemented to support single and multi-beam deployments, then synchronization latency is reduced and system performance is enhanced, but device complexity increases due to the need to handle multiple beam configurations and cyclic shift determinations
Solution Approach 1:
The SS burst structure is segmented into multiple SS blocks, each potentially associated with different beams. Each SS block contains segmented synchronization signals (PSS, SSS, PBCH) that can be independently processed. This segmentation allows the system to handle multi-beam deployments by dividing the synchronization task across multiple blocks while maintaining a unified overall structure, thereby reducing synchronization latency without overwhelming device complexity.
Solution Approach 2:
The unified SS burst structure is designed to serve multiple functions: it supports both single-beam and multi-beam deployments, carries synchronization signals, broadcast information, and beam-specific information simultaneously. This multi-functionality allows the same structure to adapt to different deployment scenarios, reducing the need for separate structures and thereby reducing synchronization latency while managing device complexity through reuse of the same framework.
2Measurement precision
If multiple cyclic shifts are determined for SSS sequences to identify cell IDs, then measurement precision is improved, but loss of time increases due to the computational overhead of generating and comparing multiple sequences
Solution Approach 1:
The cyclic shifts for SSS sequences are determined and prepared in advance based on the cell ID. Instead of computing multiple cyclic shifts dynamically during synchronization, the system pre-determines which cyclic shifts correspond to which cell IDs. This preliminary action reduces the real-time computational overhead, thereby reducing the time for sequence generation and comparison while maintaining high measurement precision for cell ID identification.
3Reliability
If SS blocks are activated and transmitted based on determined parameters, then reliability of system frame acquisition is improved, but device complexity increases due to parameter determination and QCL indications
Solution Approach 1:
Quasi-Co-Location (QCL) indications are introduced as intermediary parameters that link SS blocks to specific transmission configurations and beam directions. Instead of directly managing complex parameter sets for each SS block, the QCL indications serve as mediators that convey essential relationship information between SS blocks, beams, and transmission parameters. This intermediary approach improves the reliability of system frame acquisition by ensuring correct parameter association while reducing device complexity through standardized indication mechanisms.
Data Source
AI summary
Systems, procedures, and instrumentalities are disclosed for synchronizing a signal burst, signal design, and/or system frame acquisition. A synchronization signal (SS) block or burst may be received. The SS block or burst may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and/or a Physical Broadcast Channel (PBCH). A first cell ID may be determined and/or a plurality of SSS sequences may be generated. An m0 value (e.g., a first cyclic shift) may be determined from a set of m0 values, for example, based on the generated plurality of SSS sequences. An n1 value (e.g., a second cyclic shift) may be determined from a set of n1 values. A second cell ID may be determined, for example, based on the m0 value and the n1 value. A third cell ID may be determined, for example, based on the second cell ID and the first cell ID.