Resource Block Structure for 5G Subcarrier Spacing Adaptation
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Solution Overview
Problem
The existing LTE and LTE-A systems have limitations in scalability for various services and requirements of the 5G system, particularly in managing different subcarrier spacings, leading to inefficiencies in resource block structure and increased guard band sizes, which affect system performance and resource utilization.
Innovation Solution
The implementation of a special resource block structure within an extended frame that supports multiple subcarrier spacings using an OFDM scheme, allowing for adaptive adjustment of guard bands and efficient resource allocation by incorporating null subcarriers and flexible subcarrier spacing configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional resource block structure is used in LTE/LTE-A systems, then the system maintains backward compatibility and simple structure, but it cannot efficiently support multiple subcarrier spacings and various 5G services
Solution Approach 1:
The resource block structure is segmented into different types (first type for normal cyclic prefix, second type for extended cyclic prefix) with distinct subcarrier spacing configurations. This segmentation allows the system to support multiple subcarrier spacings (15kHz for normal CP, 7.5kHz for extended CP) while maintaining clear structural boundaries and management rules for each segment type.
Solution Approach 2:
The system dynamically selects between different resource block types based on the cyclic prefix configuration and subcarrier spacing requirements. The network can flexibly switch between first type resource blocks (15kHz spacing) and second type resource blocks (7.5kHz spacing) to adapt to different service requirements and channel conditions, making the structure dynamic rather than static.
2Reliability
If guard band size is increased to prevent inter-symbol interference, then system reliability improves, but resource utilization efficiency decreases
Solution Approach 1:
The system changes the subcarrier spacing parameter based on the cyclic prefix type: 15kHz for normal CP and 7.5kHz for extended CP. This parameter adaptation allows the guard band size to be optimized for each case, preventing inter-symbol interference while minimizing the bandwidth consumed by guard bands and maximizing resource utilization efficiency.
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system to be provided to support a higher data transmission rate since 4G communication systems like LTE. The present disclosure provides a transmission and reception method applying a special resource block structure in a scalable frame structure to integrally support various services in a cellular wireless communication system. According to the present disclosure, it is possible to minimize interference between adjacent resource blocks due to heterogeneous subcarrier spacings between the 5G system and the LTE system or the 5G system to improve system performance.