Multi-Frequency Positioning Reference Signals for Accurate IoT Tag Location
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Solution Overview
Problem
The current internet of things (IoT) tag terminals have limited transmission bandwidth, resulting in positioning accuracy of approximately 30 m, which cannot meet the positioning accuracy requirements of vertical industries below 10 m.
Innovation Solution
A method and apparatus that increase the transmission bandwidth by sending multiple positioning reference signals using different frequency information, such as frequency conversion sequences or offset values, to improve positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the tag terminal uses limited transmission bandwidth (180 kHz), then the device complexity is reduced, but the positioning accuracy deteriorates to approximately 30 m
Solution Approach 1:
The patent segments the transmission bandwidth into multiple frequency components by sending positioning reference signals at different frequencies (first frequency and second frequency). This allows the system to achieve higher positioning accuracy through frequency diversity without requiring a single overly complex high-bandwidth transmission system. The segmentation principle resolves the contradiction by distributing the transmission across multiple frequency segments rather than relying on a single high-bandwidth channel.
Solution Approach 2:
The patent introduces frequency as an additional dimension to the transmission system. Instead of increasing bandwidth in a single frequency domain, the system transmits positioning reference signals across multiple frequency levels (first frequency and second frequency). This dimensional expansion allows the system to achieve better positioning accuracy by utilizing frequency diversity, effectively transforming a one-dimensional bandwidth constraint into a multi-dimensional frequency-space solution.
2Measurement precision
If the transmission bandwidth is increased to improve positioning accuracy, then the positioning accuracy improves to below 10 m, but the use of energy increases
Solution Approach 1:
The patent employs periodic transmission of positioning reference signals at different frequencies. The system transmits positioning reference signals periodically at the first frequency and second frequency, allowing the tag terminal to utilize energy efficiently through time-division multiplexing. This periodic action enables the system to achieve high positioning accuracy while managing energy consumption by distributing transmissions across multiple time-frequency slots rather than requiring continuous high-bandwidth transmission.
Solution Approach 2:
The patent changes the frequency parameter of the positioning reference signals to achieve better positioning accuracy. By transmitting at multiple frequencies (first frequency and second frequency) rather than increasing single-channel bandwidth, the system improves positioning performance while controlling energy consumption. The parameter change principle allows the system to optimize the frequency distribution to achieve the desired accuracy level with minimal energy expenditure.
3Measurement precision
If multiple positioning reference signals are sent using different frequency information, then the transmission bandwidth is increased, but the device complexity increases
Solution Approach 1:
The patent implements a universal positioning reference signal structure that can be transmitted at multiple frequencies using the same basic signal generation and processing mechanism. The tag terminal uses identical positioning reference signal sequences at both the first frequency and second frequency, maintaining signal processing simplicity while achieving multi-frequency transmission. This universality principle allows the system to improve positioning accuracy through frequency diversity without proportionally increasing device complexity, as the same algorithms and processing chains handle all frequency components.
Data Source
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AI summary
Embodiments of this application disclose a positioning method and a related apparatus, to cause a first apparatus to receive at least two pieces of first frequency information from a network device, and send at least two positioning reference signals based on the at least two pieces of first frequency information. This helps increase a transmission bandwidth used by the first apparatus for sending the positioning reference signal, thereby improving positioning accuracy. The method in embodiments of this application includes: The first apparatus receives at least two pieces of first frequency information from the network device, where the at least two pieces of first frequency information include first frequency information 1 and first frequency information 2, the first frequency information 1 is used by the first apparatus for sending a first positioning reference signal, and the first frequency information 2 is used by the first apparatus for sending a second positioning reference signal; and the first apparatus sends at least two positioning reference signals based on the at least two pieces of first frequency information, where the at least two positioning reference signals include the first positioning reference signal and the second positioning reference signal.