Synchronization Sequence Adaptation for 5G Bandwidth Variations
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Solution Overview
Problem
In 5G communication systems, the synchronization sequence length and bandwidth are constrained by each other, leading to low detection accuracy, especially for users with different bandwidths and carrier spacings, and conventional LTE systems do not support truncated synchronization sequences with varying carrier spacings.
Innovation Solution
A method for transmitting a target synchronization sequence, where segments truncated in the time or frequency domain are rearranged to maintain good autocorrelation and cross-correlation characteristics, allowing for adaptation to different bandwidths and carrier spacings, involving Zadoff-Chu sequences and specific rearrangement rules to create sub-synchronization sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the synchronization sequence is truncated in the frequency domain to support different bandwidths, then the adaptability to different bandwidths is improved, but the detection accuracy deteriorates
Solution Approach 1:
The patent segments the long synchronization sequence into multiple segments in the frequency domain, each segment being suitable for different bandwidth configurations. This allows the system to transmit a comprehensive sequence that contains all necessary segments, and each user equipment can select and use the appropriate segment according to its bandwidth, thereby maintaining both adaptability and detection accuracy.
Solution Approach 2:
The patent embeds multiple truncated synchronization sequences of different lengths within a single long synchronization sequence structure. The long sequence acts as a container that holds nested shorter sequences, allowing user equipment with different bandwidth requirements to extract and use the appropriately sized nested sequence, thus resolving the contradiction between adaptability and accuracy.
2Measurement precision
If the carrier spacing is increased to ensure synchronization detection accuracy for moving users, then the detection accuracy is improved, but the length of synchronization sequence deteriorates
Solution Approach 1:
The patent creates a dynamic synchronization sequence structure where the effective length and properties of the sequence can be adapted based on carrier spacing requirements. By designing the long sequence with specific mathematical properties (such as Zadoff-Chu sequences with appropriate root indices), the system maintains good correlation characteristics across different carrier spacings without requiring a fixed long length, thus resolving the contradiction between accuracy and length.
3Adaptability or versatility
If the synchronization sequence is designed to support different carrier spacings, then the adaptability to different carrier spacings is improved, but the manufacturing precision of the sequence structure deteriorates
Solution Approach 1:
The patent designs a universal long synchronization sequence structure that can serve multiple carrier spacing configurations simultaneously. By using mathematically robust sequence types (such as Zadoff-Chu sequences) with carefully selected parameters, the same base sequence structure maintains its correlation properties across different carrier spacings, achieving multi-functionality without sacrificing structural precision.
Data Source
AI summary
A method for transmitting a synchronization sequence, and a method and a device for synchronization detection are provided, the method for transmitting the synchronization sequence including: setting a target synchronization sequence with good autocorrelation characteristic, where at least one segment of sequence truncated in a time domain or a frequency domain of the target synchronization sequence is a sub-synchronization sequence, and the sub-synchronization sequence has good autocorrelation characteristic and the sub-synchronization sequences have good cross-correlation between each other; and transmitting the target synchronization sequence to a user equipment.