Adaptive Synchronization Signal Detector for Wireless Cell Search

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Solution Overview

Problem

In wireless communication systems, especially in low signal-to-noise ratio environments like NB-IoT, existing cell searching methods are inefficient and power-consuming due to the need for fixed and repeated correlation calculations to detect synchronization signals.

Innovation Solution

A method and device for a wireless communication device that adaptively varies the number of accumulations for correlation calculations, allowing detection of synchronization signals based on cumulative values, reducing the need for excessive calculations once an effective signal is detected, thereby enhancing search speed and power efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If fixed and repeated correlation calculations are performed to detect synchronization signals in low SNR environments, then detection reliability is improved, but time consumption and power consumption increase

Engineering Contradiction:

Improvesynchronization signal detection reliabilityVSAvoidcell searching time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies dynamics by making the accumulation number adaptive rather than fixed. The synchronization signal detector dynamically adjusts the accumulation number based on whether a synchronization signal is detected and the current downlink path loss, allowing the system to optimize between detection reliability and searching speed under different channel conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of accumulation number adaptively. When synchronization signal detection fails, the accumulation number is increased to improve detection reliability. When detection succeeds or channel conditions improve, the accumulation number is reduced to decrease time and power consumption, thus resolving the contradiction between reliability and time loss

Inventive Principle:

Principle #35Parameter changes

2Reliability

If fixed and repeated correlation calculations are performed to detect synchronization signals, then detection reliability is improved, but power consumption increases

Engineering Contradiction:

Improvesynchronization signal detection reliabilityVSAvoiddevice power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically adjusts the accumulation number based on detection results and channel conditions, making power consumption adaptive rather than constant. This resolves the contradiction by allowing high power consumption only when necessary for reliable detection in poor conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

By changing the accumulation number parameter adaptively, the system reduces power consumption when synchronization signals are detected or channel conditions are good, while maintaining high detection reliability when needed through increased accumulation in poor conditions

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If the accumulation number is increased to detect synchronization signals in low SNR, then detection capability is improved, but cell searching speed decreases

Engineering Contradiction:

Improvesynchronization signal detection capabilityVSAvoidcell searching speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The accumulation number is made dynamic, increasing only when detection fails or channel conditions are poor, and decreasing when detection succeeds or conditions improve. This resolves the contradiction by applying high measurement precision only when necessary, maintaining high searching speed in good conditions

Inventive Principle:

Principle #15Dynamics

4Reliability

If the accumulation number is increased to improve detection in poor channel conditions, then detection reliability is improved, but device complexity increases

Engineering Contradiction:

Improvesynchronization signal detection reliabilityVSAvoidcontrol mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses feedback from synchronization signal detection results and downlink path loss measurements to adaptively adjust the accumulation number. This feedback mechanism resolves the contradiction by automatically optimizing detection reliability without requiring complex manual configuration or control mechanisms

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11930468B2Wireless communication apparatus including synchronization signal detector and cell searching method thereof

Publication Date: 2024.03.12 SAMSUNG ELECTRONICS CO LTD

AI summary

A wireless communication method includes: receiving a wireless signal including a plurality of frames, wherein each of the plurality of frames includes a plurality of sub-frames and a current frame is initially a first one of the frames; a) performing a correlation calculation between each of the sub-frames of the current frame and each a plurality of reference signals to generate a plurality of current correlation values; b) respectively accumulating the current correlation values with previous correlation values to generate cumulative values respectively corresponding to the plurality of sub-frames of the current frame; determining whether an effective synchronization signal is detected, based on the current cumulative values; and setting the current frame to a next one of the frames, setting the previous correlational values to the current correlation values, and determining whether to resume to step a) based on the determination as to whether the effective synchronization signal is detected.