Dynamic Subcarrier Spacing Selection in 5G Terminals
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Solution Overview
Problem
Current communication systems, such as those based on E-UTRA and LTE-Advanced, face inefficiencies in managing multiple subcarrier spacings, which can lead to suboptimal data transmission and reception due to fixed subcarrier configurations, limiting adaptability and flexibility in heterogeneous networks.
Innovation Solution
A terminal and base station apparatus that identifies and selects applicable subcarrier spacings based on higher layer signaling and data channel assignment information, allowing for dynamic adjustment of subcarrier spacings in data channels to optimize communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed subcarrier configurations are used in communication systems, then system simplicity is maintained, but communication efficiency and adaptability deteriorate in heterogeneous networks with multiple subcarrier spacings
Solution Approach 1:
The patent implements dynamic subcarrier spacing selection where the terminal apparatus can adaptively choose from multiple subcarrier spacings (e.g., 15 kHz, 30 kHz, 60 kHz) based on channel conditions and service requirements. The base station configures multiple subcarrier spacing values and the terminal selects the most appropriate one for each data channel, transforming the fixed configuration into a dynamic, adaptive system that optimizes communication efficiency while managing complexity through structured selection criteria
Solution Approach 2:
The patent changes the subcarrier spacing parameter from a fixed value to a selectable set of values. The base station transmits configuration information including multiple subcarrier spacing values, and the terminal apparatus selects from this set based on higher layer signaling and data channel assignment information. This parameter change enables the system to adapt to different heterogeneous network scenarios while maintaining manageable complexity through standardized selection procedures
2Adaptability or versatility
If multiple subcarrier spacings are supported with flexible selection, then adaptability and communication efficiency improve, but system complexity and configuration overhead increase
Solution Approach 1:
The base station performs preliminary configuration by transmitting subcarrier spacing configuration information to the terminal apparatus before actual data transmission. This configuration includes a set of available subcarrier spacing values. The terminal apparatus stores and processes this configuration information in advance, enabling rapid and accurate subcarrier spacing selection when data channels are assigned, thereby reducing real-time decision complexity while maintaining high adaptability
Solution Approach 2:
The patent introduces higher layer signaling as an intermediary mechanism that carries configuration information between the base station and terminal apparatus. This signaling layer mediates the complex interaction by providing structured parameters and selection criteria, allowing the terminal to systematically identify and select appropriate subcarrier spacings without directly processing raw physical layer parameters, thus managing complexity through an intermediate configuration layer
3Productivity
If dynamic subcarrier spacing selection is implemented, then data transmission and reception efficiency improve, but processing overhead and signaling requirements increase
Solution Approach 1:
The patent makes the higher layer signaling mechanism universal by using it for multiple purposes: conveying subcarrier spacing configuration information, indicating available subcarrier spacing sets, and providing selection criteria. This multi-functional signaling approach consolidates multiple information streams into a unified configuration message, reducing overall signaling overhead while enabling dynamic subcarrier spacing selection that improves data transmission efficiency across different service types and channel conditions
Data Source
AI summary
To provide a terminal apparatus, a base station apparatus, and a communication method that enable a communication apparatus (terminal apparatus and/or base station apparatus) supporting multiple subcarrier spacings to perform efficient communication. A terminal apparatus includes: a control unit configured to identify a subcarrier spacing set applicable to a data channel, based on a first parameter included in higher layer signaling; and a reception unit configured to receive a control channel including data channel assignment information. Based on a type of the data channel assignment information, the terminal apparatus selects, from the subcarrier spacing set, a subcarrier spacing applicable to the data channel assigned based on the data channel assignment information.