NPRACH Detection Using Multi-Coverage Noise Estimation
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Solution Overview
Problem
Current methods for detecting random access preambles in Narrow Band Internet of Things (NB-IoT) networks suffer from high false alarm rates due to the lack of correlation between signal and noise power estimations, which is exacerbated by the limited number of subcarriers in NPRACH resources.
Innovation Solution
The method determines an overlapping ratio between two NPRACH resource periods with different coverage levels and uses signals from both periods as statistic samples to estimate noise power, thereby increasing the number of samples and reducing estimation errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If noise power estimation is performed using only signals from a single NPRACH resource period, then the detection process is simple, but the number of statistic samples is limited leading to high false alarm rates
Solution Approach 1:
The patent combines signal samples from multiple NPRACH resource periods (first period with first coverage level and second period with second coverage level) into a unified set of statistic samples for noise power estimation. This merging approach increases the total number of available samples, improving estimation accuracy and reducing false alarm rates while maintaining a unified detection process structure.
2Quantity of substance
If NPRACH resources for different coverage levels are used independently, then the detection process is straightforward, but the limited number of subcarriers results in insufficient statistic samples
Solution Approach 1:
The patent creates a universal approach where NPRACH resources from different coverage levels (first coverage level and second coverage level) both contribute to the same noise power estimation process. By making the detection process multi-functional and applicable across different coverage scenarios, the system aggregates sufficient statistic samples from multiple sources to overcome the limitation of limited subcarriers in any single coverage level.
Data Source
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AI summary
Embodiments of the present disclosure relate to a method and device for NPRACH detect. In example embodiments, the method comprises determining whether an overlapping ratio between a first period and a second period exceeds a first threshold. A first NPRACH resource is available during the first period and a second NPRACH resource is available during the second period. The first NPRACH resource is associated with a first coverage level and the second NPRACH resource is associated with a second coverage level. The second coverage level is different from the first coverage level. The method also comprises in response to determining that the overlapping ratio exceeds the first threshold, determining a power estimation of noise based on a first plurality of signals received on the first PRACH resource and a second plurality of signals received on the second NPRACH resource. The method also comprises detecting existence of at least one random access preamble on the first NPRACH resource based on the power estimation of noise.