WLAN Radar Measurement Scheduling for Passive Object Sensing
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Solution Overview
Problem
The FTM technology in WLAN is limited to active objects and does not support passive object measurement, necessitating the integration of radar technology to enable measurement of passive objects.
Innovation Solution
An access point (AP) generates a first frame with radar measurement information to coordinate multiple stations (STAs) for radar measurement, reducing collisions and interference by orthogonal signaling and scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple STAs perform radar measurement simultaneously without coordination, then productivity is improved, but measurement precision deteriorates due to signal interference and collisions
Solution Approach 1:
The AP sends a first frame to multiple STAs before radar measurement to pre-allocate time resources and coordinate measurement timing. This preliminary coordination prevents collisions and interference during simultaneous radar measurement, allowing multiple STAs to measure passive objects without degrading measurement precision while maintaining high productivity
2Measurement precision
If FTM technology is used for positioning, then measurement precision is improved for active objects, but adaptability deteriorates because it cannot measure passive objects
Solution Approach 1:
The patent extends radar measurement capability to passive objects by having the AP send radar signals that reflect off passive objects and are received by STAs. The first frame coordinates this process for multiple STAs simultaneously, enabling the system to measure both active and passive objects, thereby achieving universality while maintaining measurement precision through coordinated resource allocation
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
The method enhances radar measurement accuracy by coordinating STAs to perform simultaneous or scheduled radar processes, minimizing interference and ensuring proper execution.
Implementation Method 1
the industry is ready to introduce a radar technology into the WLAN
Implementation Method 2
a radar emits electromagnetic waves to detect a target object, to determine a spatial position of the object
Implementation Method 3
The FTM technology ranges or positions a target object based on a time of flight of a signal
Data Source
AI summary
A radar measurement method and an apparatus are disclosed, which relate to the field of communications technologies, and are used to support radar measurement in a wireless local area network (WLAN). The method includes: An access point (AP) generates a first frame, where the first frame includes radar measurement information. Then the AP sends the first frame to M stations (STAs), to configure the way the M STAs perform radar measurement. This application is applicable to a radar measurement procedure.