Narrowband IoT Positioning Signal Sequence Design for Accuracy
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Solution Overview
Problem
The existing Narrowband Internet of Things (NB-IoT) positioning technology faces challenges with low positioning performance due to the short sequence length of narrowband positioning reference signals (NPRSs) and interference from neighboring cells, which affects the accuracy and reliability of location estimation.
Innovation Solution
A signal transmission method and apparatus that generates a second narrowband positioning reference signal sequence based on a system frame number (SFN), allowing for the transmission of a first narrowband positioning reference signal on a first radio frame set and a second narrowband positioning reference signal on a second radio frame set, thereby increasing the NPRS sequence length and reducing inter-cell conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If NPRSs of different radio frames only have repetitive gains in the time domain are used, then the implementation is simple, but the sequence length is greatly reduced and positioning accuracy deteriorates
Solution Approach 1:
The patent divides the radio frames into different sets (first radio frame set and second radio frame set) and assigns different NPRS sequences to each set. This segmentation allows the system to use longer sequences in specific frames while maintaining the repetitive gain structure across frames, thereby improving positioning accuracy without significantly increasing implementation complexity.
Solution Approach 2:
The patent implements periodic transmission of NPRS sequences with different characteristics in different radio frame sets. By periodically alternating between different sequence types across frames, the system achieves both the simplicity of repetitive gains and the improved accuracy of longer sequences.
2Measurement precision
If the sequence length of NPRSs is increased, then positioning accuracy is improved, but the impact of NPRS conflicts between cells increases
Solution Approach 1:
The patent applies different NPRS sequence characteristics to different radio frame sets, creating local variations in sequence properties. This allows longer sequences to be used in specific frames for improved accuracy while maintaining shorter sequences in other frames to reduce inter-cell conflict impact, achieving a localized optimization of the sequence design.
Solution Approach 2:
The patent changes the parameters of NPRS sequences (such as sequence length and generation parameters) based on the radio frame set. By dynamically adjusting sequence parameters across different frames, the system can optimize for both accuracy and interference reduction in different time periods.
3Area of stationary object
If NPRSs are transmitted on all radio frames, then coverage is improved, but the sequence length available for positioning is reduced due to repetitive gains
Solution Approach 1:
The patent segments the radio frame transmission into different sets, allowing NPRS to be transmitted on all frames for coverage while using different sequence lengths in different frame sets. This enables the system to maintain wide coverage while preserving longer sequence lengths in specific frames for improved positioning accuracy.
Data Source
AI summary
Provided are a signal transmission method, apparatus, and device, and a storage medium. The method includes generating a second narrowband positioning reference signal sequence according to a system frame number (SFN); obtaining a second narrowband positioning reference signal according to the second narrowband positioning reference signal sequence; and transmitting a first narrowband positioning reference signal on a first radio frame set, and transmitting the second narrowband positioning reference signal on a second radio frame set.