Wireless Object Detection Using Pilot-Triggered Reference Signals
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Solution Overview
Problem
Existing wireless communication systems face a trade-off between frequent transmission of reference signals for object detection and maintaining throughput, as increased frequency of these signals degrades communication efficiency.
Innovation Solution
A wireless communication system that controls the transmission timing of reference signals based on pilot signals received during ordinary communication, allowing for object detection without significantly impacting throughput by using pilot signals at shorter intervals to trigger the transmission of reference signals only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted frequently for object detection, then object detection precision is improved, but communication throughput is degraded
Solution Approach 1:
The patent combines object detection function with existing wireless communication functions by reusing pilot signals that are already transmitted during communication. The base station transmits pilot signals for communication purposes, and the terminal device measures propagation state information from these same signals, which are then used for object detection. This merging eliminates the need for separate reference signal transmissions dedicated solely to object detection.
Solution Approach 2:
The patent makes pilot signals serve multiple functions: they are used both for communication (channel estimation, demodulation) and for object detection (measuring propagation state information). By giving the pilot signals universal utility, the system achieves object detection without adding dedicated reference signal overhead, thus maintaining communication throughput while enabling detection functionality.
2Speed
If reference signal transmission interval is shortened, then object detection timing is improved, but time occupancy of reference signals increases
Solution Approach 1:
The system uses pilot signals that are already being transmitted as part of normal communication operations to perform object detection. Since these pilot signals are inherently present during communication, they provide self-service for detection purposes without requiring additional dedicated reference signal transmissions, thereby avoiding increased time occupancy.
Solution Approach 2:
The patent leverages the periodic transmission of pilot signals during communication to enable periodic object detection opportunities. The terminal device measures propagation state information from periodically transmitted pilot signals, allowing object detection to occur at regular intervals determined by the communication schedule rather than requiring separate periodic reference signal transmissions.
Data Source
AI summary
Provided is a wireless communication system that detects an object inside a communication area including: a base station device; and a terminal device, in which the base station device controls a timing for transmitting a reference signal for measuring a state of a propagation path on the basis of a pilot signal included in a wireless signal received from the terminal device during wireless communication and detects an object inside the communication area on the basis of propagation state information indicating a state of the propagation path received from the terminal device during wireless sensing, and the terminal device transmits, to the base station device, propagation state information measured on the basis of a reference signal received from the base station device. It is thus possible to transmit the reference signal for measuring a state of the propagation path without degrading a throughput of wireless communication.