Coordinated Radar Sensing Using Distributed User Equipment
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Solution Overview
Problem
Consumer electronic devices face challenges in implementing efficient radar sensing due to network resource limitations, hardware constraints, and size restrictions, making full-duplex processing impractical and dedicated radar hardware expensive and space-intensive.
Innovation Solution
A method involving a group of user equipment (UEs) in a cellular network coordinates to perform radar sensing, where one UE configures others to transmit and receive radar signals, filtering out interference to determine object location information, utilizing existing cellular signaling and waveforms like SRS or RACH signals, and beamforming to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-duplex processing is used for radar sensing, then radar performance is improved, but device complexity and hardware requirements increase
Solution Approach 1:
The patent divides the radar sensing function across multiple UEs, where each UE performs only reception and processing of reflected signals, while a separate UE handles transmission. This segmentation eliminates the need for full-duplex capability in each device, reducing hardware complexity while maintaining radar performance through coordinated multi-UE operation.
2Reliability
If dedicated radar hardware is implemented, then radar sensing capability is improved, but device volume and cost increase
Solution Approach 1:
The patent enables existing cellular UEs to perform radar sensing functions using their standard communication hardware (transceivers, antennas, processors) that are already designed for cellular operations. By making the UE multi-functional for both cellular communication and radar sensing, the patent eliminates the need for dedicated radar hardware, reducing device volume and cost.
Solution Approach 2:
The patent merges radar sensing functionality with existing cellular communication infrastructure by using the same transceivers, antennas, and processing units for both purposes. This consolidation eliminates the need for separate dedicated radar hardware components, thereby reducing overall device volume and cost.
3Reliability
If multiple UEs coordinate radar sensing, then radar coverage and detection capability are improved, but system coordination complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where UEs transmit radar signal samples and location information back to the coordinating UE. This feedback loop enables the coordinating UE to process combined data from multiple UEs to determine object locations, managing coordination complexity through structured information exchange and processing.
4Measurement precision
If interference filtering is applied to radar signals, then signal accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary filtering actions at individual UEs before data transmission, where each UE filters out direct signals and processes only reflected signals locally. This preliminary processing reduces the amount of data that needs to be transmitted and processed centrally, thereby reducing overall processing time while maintaining signal accuracy.
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 enables efficient radar sensing in consumer devices without the need for full-duplex processing, reducing costs and space requirements by distributing radar signal transmission and processing across multiple UEs, enhancing object detection capabilities.
Implementation Method 1
a third UE of the group of UEs to detect the first radar signal... the third UE receives the first radar signal in a set of reflection states
Data Source
AI summary
A user-equipment-coordination set in a cellular network includes multiple UEs for performing coordinated radar sensing. A first UE determines a configuration to coordinate other UEs to detect an object. The first UE uses the configuration to configure a second UE to transmit a first radar signal and a third UE to detect the first radar signal. The first UE receives first radar signal samples from the third UE based on the third UE receiving the first radar signal in multiple reflection states. The first UE filters the first radar signal samples to remove samples associated with interference from the first radar signal received in a first reflection state. The first UE determines object location information based on at least the filtered first radar signal samples.