Demodulation Reference Signal Sequence Adaptation for Variable Subcarrier Spacing
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Solution Overview
Problem
The increasing demand for data throughput in wireless communication systems, particularly with the rise of machine-to-machine (M2M) communication and smart devices, has led to a need for more efficient methods to manage limited radio resources, reduce latency, and support high-frequency bands, as existing technologies struggle to efficiently transmit and receive data with low latency and in high-density communication environments.
Innovation Solution
The use of a part of a first demodulation reference signal (DMRS) sequence based on a base subcarrier spacing is adapted for a second subcarrier spacing, where every K values of the first DMRS sequence are used for the second subcarrier spacing, allowing for efficient transmission and reception of downlink data in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing technologies are used to transmit and receive data in wireless communication systems, then the system can maintain compatibility with legacy standards, but the data throughput is insufficient and latency is high
Solution Approach 1:
The patent changes the parameter of subcarrier spacing from the traditional fixed value to variable values (15kHz, 30kHz, 60kHz, etc.), allowing the system to adapt to different service requirements. By adjusting the subcarrier spacing parameter, the system can achieve higher data throughput for eMBB services while reducing latency for URLLC services, thereby resolving the contradiction between throughput and latency
2Productivity
If more radio resources are allocated to increase data throughput, then the throughput improves, but the limited radio resources are exhausted faster
Solution Approach 1:
The patent introduces dynamic resource allocation where the subcarrier spacing and resource block sizes are adjusted based on service type and channel conditions. For example, wider subcarrier spacing (60kHz) is used for high-throughput eMBB services requiring more resources, while narrower spacing (15kHz) is used for latency-sensitive URLLC services. This dynamic adjustment allows efficient utilization of limited radio resources while meeting diverse service requirements
Solution Approach 2:
The patent segments the radio resources into different types based on service requirements, with separate resource pools for eMBB, mMTC, and URLLC services. Each service type can be allocated appropriate resources without competing for the same pool, thereby improving overall resource utilization efficiency while maintaining high throughput for each service category
3Productivity
If the system supports high-frequency bands for increased capacity, then more data can be transmitted, but the signal transmission and reception becomes more challenging
Solution Approach 1:
The patent adjusts the subcarrier spacing parameter to be larger for high-frequency band operations. Larger subcarrier spacing (e.g., 60kHz or 120kHz) is more robust to phase noise and frequency offset issues that are more severe at high frequencies. This parameter adjustment maintains signal transmission reliability while enabling the system to utilize high-frequency bands for increased data capacity
4Measurement precision
If the DMRS sequence is designed for each specific subcarrier spacing, then the demodulation accuracy is optimized, but the system complexity increases
Solution Approach 1:
The patent designs a universal DMRS sequence generation method that can be applied across multiple subcarrier spacing values (15kHz, 30kHz, 60kHz, etc.). The same sequence generation algorithm and reference signal structure are used regardless of the subcarrier spacing, allowing the system to maintain demodulation accuracy while avoiding the complexity of designing separate DMRS sequences for each spacing value
Data Source
AI summary
In the present invention, a part of a first demodulation reference signal sequence generated on the basis of a basic subcarrier interval (hereinafter, a first subcarrier interval) is used for a second subcarrier interval which is K times the first subcarrier interval. Values selected one for every K from among values constituting the first demodulation reference signal sequence may be used as values constituting a second demodulation reference signal sequence for the second subcarrier interval.