Backscatter Terminal State Signaling for Energy-Limited Links
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Solution Overview
Problem
Zero-power communication systems face challenges in indicating communication states to network devices due to energy harvesting limitations, leading to potential communication interruptions and inefficiencies.
Innovation Solution
A communication state indication method where a terminal device sends target indication information through backscattering to a network device, allowing the network device to determine the terminal's communication state, thereby improving communication performance and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a zero-power terminal harvests energy from radio waves to enable communication, then the terminal can operate without a battery, but the terminal may enter various communication states due to energy harvesting limitations
Solution Approach 1:
The terminal device sends indication information to the network device to feedback its current communication state (normal state or abnormal state). This feedback mechanism allows the network device to understand the terminal's energy status and adjust communication parameters accordingly, resolving the reliability issue caused by energy harvesting limitations while maintaining energy autonomy
Solution Approach 2:
The system dynamically adjusts communication parameters based on the terminal's energy harvesting status. The terminal can transition between different communication states (normal and abnormal) and the network device adapts its communication strategy accordingly, allowing the system to operate effectively despite varying energy availability
2Loss of information
If the terminal device sends indication information to communicate its state, then the network device can monitor communication status, but the terminal consumes additional energy for transmission
Solution Approach 1:
The terminal device uses its own backscattering communication capability to send indication information without requiring additional active transmission resources. The terminal modulates the incoming radio waves to encode its state information, thereby self-serving the information transmission need while minimizing additional energy consumption
Solution Approach 2:
The backscattering communication mechanism serves multiple functions: it enables both data transmission and state indication simultaneously. The same modulated radio waves carry both communication data and communication state information, eliminating the need for separate transmission channels and reducing overall energy consumption
3Loss of energy
If the terminal communicates through backscattering, then the terminal consumes minimal energy, but the network device may have difficulty detecting and measuring the terminal's communication state
Solution Approach 1:
The terminal device modulates the phase or frequency of the backscattered radio waves to encode different communication states (e.g., phase shift for normal state, different phase shift for abnormal state). This modulation creates detectable changes in the backscattered signal that allow the network device to easily distinguish between different terminal states while maintaining low energy consumption
Solution Approach 2:
The system establishes a predefined mapping between modulation patterns and communication states before actual communication begins. The network device is pre-configured to recognize specific modulation patterns as indicators of normal or abnormal states, eliminating the need for complex real-time analysis and reducing detection difficulty
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 method enables effective communication state monitoring and management, reducing interruptions and enhancing the overall performance of zero-power communication systems by allowing timely adjustments and resource allocation.
Implementation Method 1
the terminal device communicates with the network device through backscattering
Data Source
AI summary
A communication state indication method includes: indicating, by a terminal device by whether to send target indication information and/or a content indicated by the target indication information, the communication state of the terminal device to a network device, where the terminal device communicates with the network device through backscattering.