Reference Sensing Node Relay Timing for Accurate 5G RF Sensing
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Solution Overview
Problem
Existing wireless communication systems, particularly in the context of 5G, face challenges in optimizing RF sensing and positioning accuracy due to inefficiencies in signaling and calibration processes, leading to suboptimal performance in RF sensing operations.
Innovation Solution
The implementation of a positioning reference unit (PRU) with enhanced functionalities for bistatic RF sensing, including calibration and triggering conditions, reduces signaling overhead and improves RF sensing performance by utilizing a configured reception-to-transmission (Rx-Tx) time difference in transmitting modified sensing reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional sensing reference signal transmission methods are used, then signaling overhead is high, but RF sensing accuracy is compromised
Solution Approach 1:
The system performs preliminary calibration by transmitting calibration reference signals before actual sensing operations. The receiver node stores calibration data obtained during this preliminary phase, which is then used to compensate for hardware impairments during subsequent sensing measurements, eliminating the need for repeated calibration signaling.
Solution Approach 2:
The patent uses positioning reference signals (PRS) that are originally designed for positioning purposes and copies their structure for sensing applications. By reusing the existing PRS framework and adding sensing-specific processing at the receiver, the system avoids creating a completely new signaling structure, thereby reducing overall signaling overhead while maintaining sensing accuracy.
2Measurement precision
If calibration processes are performed frequently to maintain accuracy, then measurement precision improves, but loss of time increases
Solution Approach 1:
The system performs calibration in advance during idle periods or initial connection phases, storing the calibration results for reuse. This preliminary calibration action eliminates the need for frequent real-time calibration, thereby maintaining measurement precision without incurring continuous time loss.
Solution Approach 2:
The receiver node autonomously applies stored calibration data to compensate for hardware impairments during sensing operations without requiring external calibration signals. This self-service approach allows the system to maintain accuracy independently once calibration is performed, eliminating ongoing calibration time requirements.
3Measurement precision
If hardware impairments are compensated through complex calibration, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent leverages the existing positioning reference signal framework and copies its processing structure for sensing applications. By reusing established PRS processing chains and adding sensing-specific measurements, the system achieves hardware impairment compensation without creating entirely new complex calibration mechanisms.
Solution Approach 2:
The system uses a universal calibration approach where the same reference signal structure serves both positioning and sensing functions. The receiver node performs both positioning and sensing measurements using the same signal framework, reducing the need for separate calibration processes for different functions and thereby reducing overall device complexity.
Data Source
AI summary
Disclosed are techniques for wireless sensing. In an aspect, a reference sensing node receives a sensing reference signal from a transmitter sensing node, wherein the sensing reference signal is configured according to a first set of parameters, and transmits, to a receiver sensing node, a modified version of the sensing reference signal, wherein the modified version of the sensing reference signal is configured according to a second set of parameters, and wherein the modified version of the sensing reference signal is transmitted according to a configured reception-to-transmission (Rx-Tx) time difference between reception of the sensing reference signal and transmission of the modified version of the sensing reference signal.