Adaptive Receiving Window for 5G Positioning Reference Signals
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Solution Overview
Problem
Higher carrier frequencies in 5G NR communication networks, such as above 52.6 GHz, lead to increased subcarrier spacing, resulting in shorter OFDM symbol and cyclic prefix lengths, which can cause symbol alignment breakdown for positioning reference signals (PRSs) received from distant base stations, leading to inter-symbol interference and reduced positioning accuracy.
Innovation Solution
An adaptive and flexible receiving window is introduced for positioning reference signals, allowing the receiver to adjust the window width based on estimated propagation delay, signal quality, and comb structure, enabling improved PRS measurement performance and positioning accuracy without increasing system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If higher carrier frequencies are used, then positioning accuracy is improved, but symbol alignment breaks down causing inter-symbol interference
Solution Approach 1:
The receiving window is made dynamic by adjusting its length based on the estimated propagation delay. The window length is set to be greater than the cyclic prefix length when propagation delay exceeds the CP length, allowing the receiver to adapt to varying delay conditions and maintain symbol alignment at higher frequencies
Solution Approach 2:
The system changes the receiving window parameter (length) based on the propagation delay estimation. By modifying this parameter dynamically, the system maintains reliable symbol alignment while operating at higher carrier frequencies that provide better positioning accuracy
2Productivity
If subcarrier spacing is increased, then bandwidth efficiency is improved, but OFDM symbol length becomes shorter causing alignment issues
Solution Approach 1:
The receiving window length is dynamically adjusted based on the estimated propagation delay, which accounts for the shorter symbol lengths at higher subcarrier spacings. This dynamic adjustment ensures proper alignment despite the reduced symbol duration
Solution Approach 2:
The system performs preliminary estimation of the propagation delay before receiving the positioning reference signal. This preliminary action allows the receiver to configure the appropriate window length in advance, ensuring proper alignment when the signal arrives
3Productivity
If cyclic prefix length is reduced, then spectral efficiency is improved, but inter-symbol interference increases
Solution Approach 1:
The receiving window length is dynamically set to exceed the cyclic prefix length when propagation delay is large, effectively filtering out inter-symbol interference while maintaining the benefits of reduced CP length for spectral efficiency
Solution Approach 2:
The extended receiving window acts as an intermediary mechanism that separates the useful signal from interfering symbols. By extending the window beyond the CP length, the system can selectively process only the relevant signal portion, eliminating ISI
Data Source
AI summary
Embodiments of the present disclosure relate to UL-based and DL-based positioning in a wireless communication network. A method comprises: determining, by a first device, an estimation of a propagation delay for a first reference signal to be transmitted from a second device; in accordance with a determination that the estimation of the propagation delay exceeds a threshold delay, determining a target period within a symbol on which at least a part of the first reference signal is transmitted; and performing positioning measurements on the first reference signal within the target period. As such, the receiver is capable of applying an adaptive and adjustable window for receiving different positioning reference signals (PRSs) depending on various conditions and situations. In this way, the PRS measurement performance and the positioning accuracy can be greatly improved.