Partial Band Reference Signal Density Configuration
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting reference signals across varying frequency bands due to differences in channel properties and user equipment speeds, leading to suboptimal channel estimation and resource allocation.
Innovation Solution
The method involves dividing the system band into partial bands and configuring time-axis high density and low density reference signals based on the center frequency, with different densities for subframes, allowing for flexible and adaptive reference signal transmission to user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform reference signal density is used across the entire system band, then the implementation is simple, but the channel estimation accuracy deteriorates in high frequency bands with different channel properties
Solution Approach 1:
The system band is divided into multiple partial bands (first partial band and second partial band) with different center frequencies. Each partial band is configured with appropriate reference signal density according to its specific channel properties, allowing optimized channel estimation accuracy for each band while maintaining manageable system complexity through structured segmentation.
Solution Approach 2:
Different reference signal densities are applied to different partial bands based on their local channel characteristics. The first partial band with center frequency f1 uses a different reference signal configuration than the second partial band with center frequency f2, ensuring that each local region receives the appropriate signal density for its specific propagation conditions.
2Measurement precision
If high density reference signals are transmitted across all frequency bands, then channel estimation accuracy is improved, but resource overhead and system complexity increase
Solution Approach 1:
The patent applies different reference signal densities to different partial bands according to their specific needs. High density reference signals are transmitted only in partial bands where channel properties require them, while other partial bands use lower density configurations, thereby improving channel estimation accuracy where needed without unnecessarily increasing overall system complexity.
Solution Approach 2:
The reference signal density parameter is changed according to the center frequency of each partial band. By adjusting the reference signal configuration parameters (density, pattern) to match the specific frequency band characteristics, the system achieves optimal channel estimation accuracy for each band while avoiding the overhead of uniformly high density transmission across all bands.
3Speed
If reference signal density is increased to support high-speed user equipment, then channel tracking performance is improved, but resource consumption increases
Solution Approach 1:
The system provides enhanced reference signal density in specific partial bands where high-speed user equipment operates, while maintaining lower density in other bands. This localized enhancement improves channel tracking performance for high-speed devices without unnecessarily increasing reference signal resources across the entire system band.
Solution Approach 2:
The system band is segmented into partial bands with different reference signal densities. High-speed user equipment can be served in partial bands with higher reference signal density for better channel tracking, while other partial bands use reduced density to conserve resources, achieving speed support optimization without system-wide resource increase.
Data Source
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AI summary
A method of transmitting a reference signal from a base station to a user equipment in a wireless communication system and apparatus therefor are disclosed. The present invention includes dividing a system band into at least one or more partial bands, configuring a time-axis high density reference signal on a high frequency partial band with reference to a center frequency of the system band, configuring a time-axis low density reference signal on a low frequency partial band with reference to the center frequency, and transmitting the configured reference signals to the user equipment.