Passive IoT Terminal Backscatter for Active Random Access
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Solution Overview
Problem
Existing terminals in back scattering communication systems can only passively communicate with network devices, lacking the ability to actively initiate communication processes.
Innovation Solution
A random access method is introduced for terminals, such as zero power or passive IoT terminals, to actively communicate with network devices using back scattered signals that carry a terminal identifier or sequence, enabling active communication initiation through a trigger signal and back scattering occasions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminals use back scattering communication to actively initiate communication, then communication initiation capability is improved, but device complexity increases due to requirement of trigger signals and random access procedures
Solution Approach 1:
The network device transmits trigger signals in advance to initiate the random access procedure. The terminal prepares and transmits back scattered signals containing terminal identifiers or sequences before actual data communication is needed, enabling active communication initiation without complex real-time processing
Solution Approach 2:
The network device receives back scattered signals from terminals, identifies the terminal based on the signal content, and provides feedback through trigger signals. This feedback mechanism enables the terminal to actively initiate communication while maintaining system control and managing procedure complexity
2Productivity
If terminals transmit back scattered signals with terminal identifiers, then communication efficiency is improved, but energy consumption increases
Solution Approach 1:
The terminal uses its own received trigger signal as the basis for generating the back scattered signal, effectively serving itself by modulating the incoming signal rather than generating a completely new transmission. This self-service approach maintains communication efficiency while minimizing additional energy consumption
Solution Approach 2:
The terminal modifies parameters of the received signal (such as phase, amplitude, or frequency) to encode the terminal identifier or sequence information in the back scattered signal. This parameter-based modulation achieves efficient communication without requiring the terminal to generate full-power transmissions
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
Enables terminals to actively initiate communication with network devices, enhancing communication flexibility and efficiency without requiring traditional power sources or complex radio frequency components.
Implementation Method 1
a terminal receives a wireless signal from a network device, adds information to the wireless signal, and radiates it through the antenna. This process is called back scattering communication
Data Source
AI summary
A random access method includes: a terminal receives a first signal from a network device, and transmits, based on the first signal, a second signal which is a back scattered signal of the first signal. The second signal carries a first sequence and/or a first terminal identifier, the first terminal identifier is an identifier of the terminal, and the first sequence and/or the first terminal identifier is used for random access procedure of the terminal. The terminal is a zero power terminal, or a passive Internet of Things (IoT) terminal, or an ambient powered IoT terminal.