Backscatter Terminal Synchronization via Energy Supply Signals
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Solution Overview
Problem
The challenge is to apply zero-power-consumption terminals to the cellular Internet of Things (IoT) to enrich terminal diversity and quantity, while reducing synchronization errors for accurate timing and frequency in data transmission, which is hindered by limited coverage distance and energy harvesting efficiency.
Innovation Solution
The solution involves carrying synchronization information in the energy supply signal to enable zero-power-consumption terminals to send reflected signals accurately, using energy harvesting and backscatter communication technologies, and incorporating synchronization sequences to adjust timing and frequency errors, thereby improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If zero-power-consumption terminals are applied to cellular IoT using energy harvesting and backscatter communication, then terminal diversity and quantity are enriched, but synchronization errors increase leading to inaccurate timing and frequency
Solution Approach 1:
The patent applies preliminary action by pre-configuring synchronization sequences and timing adjustment information in the energy supply signal before the terminal device performs backscatter communication. The network device sends synchronization sequences and timing adjustment information in advance, allowing the terminal to adjust its timing and frequency before actual data transmission, thereby resolving synchronization errors that would otherwise accumulate during operation.
Solution Approach 2:
The patent implements feedback by having the terminal device send timing adjustment feedback information back to the network device. The terminal measures synchronization errors in received signals and sends feedback containing timing adjustment information, which the network device uses to adjust future transmissions. This closed-loop feedback mechanism continuously reduces synchronization errors while maintaining terminal diversity.
2Use of energy by moving object
If energy harvesting is used to power zero-power-consumption terminals, then power consumption is reduced to zero, but energy harvesting efficiency is limited restricting communication distance
Solution Approach 1:
The patent merges the energy supply function and communication signal function into a single unified signal. The network device transmits an energy supply signal that simultaneously provides power to the terminal through energy harvesting and carries synchronization information for communication. This dual-function signal allows the terminal to harvest energy while receiving timing and frequency synchronization information, enabling accurate backscatter communication over extended distances without requiring separate power and communication channels.
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 allows for the widespread adoption of zero-power-consumption terminals in cellular IoT, enhancing data transmission accuracy and system performance by reducing synchronization errors and extending communication distances through efficient energy harvesting and synchronization adjustments.
Implementation Method 1
receiving an energy supply signal, where the energy supply signal carries synchronization information for a terminal device
Implementation Method 2
sending a reflected signal to a network device based on the synchronization information
Data Source
AI summary
Embodiments of this application provide a wireless communication method, a terminal device, and an energy supply node. The method includes: receiving an energy supply signal, where the energy supply signal carries synchronization information for the terminal device and/or a synchronization sequence for determining the synchronization information; and sending a reflected signal to a network device based on the synchronization information.