PRS Sequence Generation for OTDOA Positioning Accuracy
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Solution Overview
Problem
The existing OTDOA positioning technique for IoT devices in LTE networks faces accuracy issues, particularly in limited bandwidth scenarios, leading to increased power consumption and network resource utilization due to the need for multiple time-domain repetitions of PRS sequences.
Innovation Solution
A modified approach to generate PRS sequences with zero cross correlation by using a unique identifier for each base station to create a pair of PRS sequences, where one sequence is the opposite of the other, reducing cross correlation and improving positioning accuracy, applicable in both legacy and newer networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy PRS sequences are used in limited bandwidth scenarios, then system compatibility is maintained, but positioning accuracy deteriorates
Solution Approach 1:
The patent modifies the PRS sequence generation parameters by introducing a band-specific shift value that changes based on the bandwidth configuration. This allows the system to maintain compatibility with legacy sequences while improving positioning accuracy in limited bandwidth scenarios through parameter optimization.
Solution Approach 2:
The patent segments the PRS sequence generation process into multiple components: a base Gold sequence generation part that maintains legacy compatibility, and a band-specific modification part that improves accuracy. This segmentation allows independent optimization of each component.
2Measurement precision
If multiple time-domain repetitions of PRS are accumulated, then positioning accuracy improves, but power consumption increases
Solution Approach 1:
By optimizing the PRS sequence parameters specifically for limited bandwidth scenarios, the patent improves the correlation properties of the sequences. This allows the UE to achieve the required positioning accuracy with fewer time-domain repetitions, thereby reducing power consumption.
3Measurement precision
If multiple time-domain repetitions of PRS are accumulated, then positioning accuracy improves, but network resource utilization increases
Solution Approach 1:
The patent introduces band-specific parameter modifications to the PRS sequences that enhance their performance in limited bandwidth. This improvement in sequence properties reduces the number of repetitions needed, thereby decreasing network resource utilization while maintaining positioning accuracy.
4Device complexity
If PRS sequences from different base stations have high cross correlation, then sequence generation simplicity is maintained, but positioning accuracy deteriorates
Solution Approach 1:
The patent modifies the PRS sequence generation parameters by introducing a base station ID-dependent shift that is specifically designed to reduce cross-correlation between sequences from different base stations. This parameter modification maintains generation simplicity while significantly improving positioning accuracy.
Data Source
AI summary
A position reference signal (PRS) to support observed time difference of arrival (OTDOA) position determination in an electronic device is generated and transmitted by a network node that has a unique identifier. Generating the PRS includes generating a first PRS sequence and generating a second PRS sequence by modifying the first PRS sequence with a modification function to generate the second PRS sequence. A sum of the first PRS sequence and the second PRS sequence is zero.