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Solution Overview

Problem

The current LTE SSS design is prone to high cross-correlation, leading to a high probability of incorrect cell ID detection during hand-over procedures, especially in the context of the New Radio (NR) access technology, which requires a larger number of cell IDs.

Innovation Solution

A processing device generates secondary synchronization signal sequences by determining first and second cyclic shifts based on a cell ID, ensuring non-consecutive shifts between sequences, using modulo-2 summation of cyclically shifted binary sequences, particularly m-sequences, to reduce cross-correlation and enable efficient encoding and decoding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the LTE SSS design uses many SSS sequence pairs with the same cyclic shift, then the number of cell IDs that can be provided is increased, but the cross-correlation between sequences increases leading to incorrect cell ID detection

Engineering Contradiction:

Improvenumber of cell IDsVSAvoidcell ID detection accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the parameter of cyclic shift distribution by ensuring that cyclically shifted versions of SSS sequences are non-consecutively shifted. This parameter change reduces cross-correlation between sequences while maintaining the ability to provide a large number of cell IDs through the modulo-2 summation of cyclically shifted binary sequences

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite construction by combining multiple binary sequences through modulo-2 summation to create SSS sequences. This composite approach allows the system to achieve both high versatility (many cell IDs) and high reliability (low cross-correlation) by leveraging the properties of combined sequences rather than relying on single sequences

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional LTE SSS sequences are used, then the system is simple to implement, but cross-correlation is high causing errors during hand-over procedures

Engineering Contradiction:

Improveimplementation simplicityVSAvoidcross-correlation errors

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent converts the potentially harmful effect of cyclic shifts (which can cause consecutive shifts and high cross-correlation) into a beneficial feature by deliberately designing the cyclic shift pattern to be non-consecutive. This transforms the cyclic shift mechanism from a source of errors during hand-over to a feature that reduces cross-correlation while maintaining implementation simplicity through the modulo-2 summation approach

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Adaptability or versatility

If more SSS sequences are generated with the same cyclic shift pattern, then cell ID encoding capacity is increased, but detection complexity and search time increase

Engineering Contradiction:

Improvecell ID encoding capacityVSAvoidcell search time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent changes the parameter of sequence generation by using non-consecutive cyclic shifts in the modulo-2 summation of binary sequences. This parameter change enables efficient cell ID encoding capacity while reducing detection complexity and search time because the non-consecutive shift pattern reduces cross-correlation, allowing faster and more accurate sequence detection

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12615071B2Processing device, network node, client device, and methods thereof

Publication Date: 2026.04.28 HUAWEI TECH CO LTD

AI summary

This disclosure relates to techniques for synchronization signals. The synchronization signal comprises a primary synchronization signal (PSS) generated based on a PSS sequence and a secondary synchronization signal (SSS) generated based on an SSS sequence. The SSS sequence may be generated based on a first sequence corresponding to a first cyclic shift and a second sequence corresponding to a second cyclic shift. The first cyclic shift and the second cyclic shift are associated with a Cell ID. The PSS sequence may be generated based on one of the first and the second sequences.