Positioning Reference Signal Continuity Across OFDM Symbols
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Solution Overview
Problem
Conventional reference signals in communication systems often discontinue at symbol boundaries due to OFDM characteristics, leading to insufficient data acquisition for UE positioning and potential orthogonality issues during FFT processing.
Innovation Solution
A method and apparatus for transmitting a positioning reference signal that ensures continuity across multiple symbols by synthesizing time domain sample data with cyclic prefix insertion and extended subcarrier waveforms, allowing for increased flexibility in FFT window placement and reduced wireless resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional reference signal is transmitted in OFDM system, then the signal can be transmitted through the communication system, but the reference signal discontinues at symbol boundaries leading to insufficient data for UE positioning
Solution Approach 1:
The patent extends the reference signal waveform to continue across multiple OFDM symbols by synthesizing time domain sample data that spans symbol boundaries. This is achieved by generating a continuous waveform that is not limited to single-symbol duration, thereby ensuring the reference signal maintains continuity throughout the extended time interval including multiple cyclic prefixes and useful signal periods.
2Adaptability or versatility
If the FFT window is not aligned with the valid period of a symbol, then flexibility in window placement increases, but orthogonality of subcarriers is not guaranteed
Solution Approach 1:
The patent transitions from single-symbol reference signals to multi-symbol continuous waveforms, adding a time dimension to the reference signal structure. This dimensional extension allows the FFT window to be positioned flexibly across multiple symbols while maintaining orthogonality, as the continuous waveform provides sufficient valid signal periods regardless of window alignment.
3Measurement precision
If the reference signal is extended to continue during multiple symbols, then positioning performance improves, but the device complexity increases
Solution Approach 1:
The patent performs preliminary synthesis of time domain sample data that spans multiple symbols before transmission. By pre-generating the extended continuous waveform with proper cyclic prefix insertion and waveform continuation, the system prepares the reference signal in advance, reducing the complexity of real-time processing and enabling efficient transmission of the extended reference signal.
Data Source
AI summary
Provided is a positioning reference signal transmission method performed by a transmitter, the method including acquiring a first time domain sample data in which a cyclic prefix (CP) insertion is completed based on a zero input; acquiring a second time domain sample data corresponding to a waveform of a signal that continues during a plurality of symbols; synthesizing the first time domain sample data and the second time domain sample data; and transmitting a positioning reference signal based on a result of synthesizing the first time domain sample data and the second time domain sample data.