Base Station Synchronization Signal Discrete Subcarrier Arrangement

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Solution Overview

Problem

In scalable subcarrier spacing scenarios for 5G mobile communication systems, existing technologies burden radio terminals with increased processing loads due to the need to use all possible subcarrier spacings for synchronization, which is inefficient.

Innovation Solution

A base station transmits synchronization signals using a predetermined subcarrier spacing, arranging them in discrete, non-continuous subcarriers, and includes a signal sequence indicating the spacing, allowing radio terminals to recognize and synchronize using a standardized process irrespective of the cell's subcarrier spacing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If radio terminals use all possible subcarrier spacings for synchronization in scalable subcarrier spacing scenarios, then synchronization compatibility across different cells is improved, but processing load on radio terminals increases

Engineering Contradiction:
Improvesynchronization compatibilityVSAvoidprocessing load
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent changes the parameter of subcarrier spacing arrangement by transmitting synchronization signals in discrete, non-continuous subcarriers rather than continuous subcarriers. This allows the synchronization signal to be adaptable to different subcarrier spacings (15kHz, 30kHz, 60kHz) while the radio terminal only needs to process one standardized arrangement, reducing processing load while maintaining synchronization compatibility across cells with different numerologies

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The discrete subcarrier arrangement serves as a universal solution that works across multiple subcarrier spacing configurations. By placing synchronization signals in discrete subcarriers with standardized spacing, the system achieves multi-functionality where a single transmission method supports cells with 15kHz, 30kHz, and 60kHz subcarrier spacings, eliminating the need for terminals to handle multiple separate synchronization procedures

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Difficulty of detecting and measuring

If synchronization signals are transmitted in continuous subcarriers, then signal detection is simplified, but flexibility in adapting to different subcarrier spacings is reduced

Engineering Contradiction:
Improvesignal detectionVSAvoidsubcarrier spacing flexibility
Core Design Contradiction:
Difficulty of detecting and measuringVSAdaptability or versatility

Solution Approach 1:

The patent changes the arrangement parameter from continuous to discrete subcarriers, and crucially, changes the spacing parameter between discrete subcarriers to match the terminal's standardized processing spacing. This maintains detection simplicity while enabling adaptability to different cell subcarrier spacings through the discrete arrangement pattern

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The synchronization signal is segmented into discrete subcarrier positions rather than occupying continuous subcarriers. This segmentation allows the signal to be placed at specific intervals that can accommodate different numerologies while maintaining a regular, detectable pattern that terminals can efficiently process

Inventive Principle:
Principle #1Segmentation

Data Source

PatentEP4007415A1Base station and radio terminal in dual connectivity or carrier aggregation with multiple numerology
Publication Date: 2022.06.01 KYOCERA CORP
  • EP4007415A1 patent drawingFigure 1
  • EP4007415A1 patent drawingFigure 2~3
  • EP4007415A1 patent drawingFigure 4~5

AI summary

Abase station according to one embodiment includes: a transmitter configured to transmit a synchronization signal in a cell using a predetermined subcarrier spacing, the cell being managed by the base station; and a controller configured to arrange, based on the predetermined subcarrier spacing, the synchronization signal in a plurality of discrete subcarriers not continuous in a frequency direction.