Uplink Transmit Power Coordination for Human Detection
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of 5G New Radio (NR), face challenges in efficiently determining the presence and location of humans to optimize transmit power while adhering to maximum permissible exposure requirements, which affects spectral efficiency and coverage.
Innovation Solution
A method involving wireless devices that transmit and receive consecutive signals to determine the time of flight (ToF) between devices, allowing for human detection and power adjustment based on the presence and location of humans, thereby optimizing transmit power and meeting regulatory exposure limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmit power is increased to improve coverage and spectral efficiency, then communication performance is improved, but exposure to human tissue increases violating maximum permissible exposure requirements
Solution Approach 1:
The patent implements dynamic transmit power adjustment based on real-time human presence detection. The system transitions from static power levels to adaptive power control, where the base station continuously monitors for human presence and adjusts uplink transmit power accordingly - using higher power when no human is detected and reducing power when human presence is confirmed, thus resolving the contradiction between maintaining communication performance and limiting exposure
Solution Approach 2:
The system employs feedback mechanisms where the base station receives human presence detection results from wireless devices and uses this information to adjust subsequent transmit power levels. This closed-loop control enables the system to respond to changing conditions and optimize the balance between spectral efficiency and exposure compliance based on actual environmental conditions
2Object-affected harmful factors
If transmit power is reduced to comply with exposure regulations, then exposure requirements are met, but coverage and spectral efficiency deteriorate
Solution Approach 1:
The system dynamically adjusts coverage area based on human presence detection. When no human is detected in the environment, the base station can expand coverage by increasing transmit power. When human presence is detected, the system contracts the effective coverage by reducing power, accepting temporary performance degradation to ensure safety compliance
Solution Approach 2:
The base station performs preliminary human presence detection before initiating high-power transmissions. By checking for human presence in advance and adjusting power levels proactively, the system prevents exposure violations while maintaining optimal coverage conditions when safe to do so
3Object-affected harmful factors
If human presence detection is implemented to optimize power, then exposure compliance is improved, but system complexity increases due to coordination procedures
Solution Approach 1:
The patent implements self-service human presence detection where wireless devices autonomously monitor their environment for human presence and report findings to the base station. This distributes the detection burden from the base station to individual devices, simplifying the overall system architecture while maintaining exposure compliance capabilities
Solution Approach 2:
The system uses the existing wireless communication infrastructure for dual purposes: standard data transmission and human presence detection. The same wireless signals serve both communication functions and sensing functions, eliminating the need for separate detection hardware and reducing overall system complexity
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 enhances spectral efficiency and coverage by dynamically adjusting transmit power based on human presence, ensuring compliance with exposure regulations and improving communication performance.
Implementation Method 1
determining whether the human is present in the environment based at least in part on a first time of flight (ToF) and a second ToF between the first wireless device and the second wireless device
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a first wireless device transmits a request to participate in a coordination and detection procedure to determine whether a human is present in an environment of the first wireless device, receives an acknowledgment from at least a second wireless device, transmits a first set of at least two consecutive wireless signals to the second wireless device, receives a second set of at least two consecutive wireless signals from the second wireless device, determines whether the human is present in the environment based at least in part on a first time of flight (ToF) and a second ToF between the first wireless device and the second wireless device, and sets a transmit power of the first wireless device based on the determination of whether the human is present in the environment.