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
Engineering 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
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
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
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
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
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
Data Source
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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.