Shared Physical Channel RF Sensing Using DMRS for Low-Overhead Positioning
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Solution Overview
Problem
Existing RF sensing techniques for determining the position of an object involve significant overhead due to the use of dedicated signaling and processing, especially for longer-duration signals to enhance Doppler resolution and Signal-to-Noise Ratio (SNR).
Innovation Solution
Leveraging shared physical channels in wireless communications, such as PDSCH, PUSCH, and PSSCH, by extracting data based on Demodulation Reference Signals (DMRS) and reconstructing modulation symbols for RF sensing measurements, reducing the need for dedicated signaling and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specialized signals are used for RF sensing measurements, then measurement precision is improved, but device complexity increases due to dedicated signaling and processing
Solution Approach 1:
The patent applies universality by enabling shared physical channels (PDSCH, PUSCH, PSSCH) to serve dual purposes: both wireless communication data transmission and RF sensing measurements. The Demodulation Reference Signals (DMRS) embedded in these channels are utilized for both channel demodulation and sensing measurements, eliminating the need for separate dedicated sensing signals and reducing system complexity while maintaining measurement precision
2Measurement precision
If longer-duration signals are used to enhance Doppler resolution and SNR, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent implements continuity of useful action by utilizing ongoing communication signals that are continuously transmitted for data purposes. These shared physical channels carry both communication data and sensing reference signals simultaneously, allowing sensing measurements to be performed continuously without requiring separate dedicated sensing transmission time, thereby improving Doppler resolution and SNR without proportionally increasing time loss
3Measurement precision
If dedicated signaling is used for RF sensing, then measurement precision is improved, but productivity decreases due to overhead
Solution Approach 1:
The patent applies merging by combining RF sensing functionality with existing wireless communication infrastructure. The shared physical channels (PDSCH, PUSCH, PSSCH) that carry communication data are merged with sensing reference signal functionality through DMRS. This integration allows the system to perform both communication and sensing operations using the same physical resources, eliminating the overhead of dedicated sensing signals while maintaining measurement precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces overhead and enhances the efficiency of RF sensing by utilizing existing wireless communication infrastructure for accurate object positioning and measurement.
Implementation Method 1
RF sensing techniques are being developed to determine the position of an object. These techniques can involve transmission of RF signals by a transmitting device, which reflect off the object and are received by a receiving device.
Data Source
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AI summary
A shared physical channel can be used for passive radio frequency (RF) sensing of an object in a wireless communication network. Embodiments can comprise methods, devices, systems, and/or other means for receiving the shared physical channel, where the shared physical channel is received via RF signals transmitted by a transmitting device and reflected to the receiving device from the object. Data of the shared physical channel can be decoded based on a demodulation reference signal (DMRS) of the shared physical channel. Subsequent to decoding, modulation symbols used to transmit the shared physical channel and DMRS can be reconstructed. One or more RF sensing measurements of the object can be made using the reconstructed modulation symbols.