Backscatter Channel Access for Zero-Power Data Transmission
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Solution Overview
Problem
Existing communication technologies face challenges in implementing data transmission using zero-power consumption devices, particularly in unlicensed spectrum scenarios, due to high cost, complexity, and power consumption issues.
Innovation Solution
A data transmission method involving channel listening and occupation by a first device, where a first signal is transmitted to a second zero-power consumption device during an idle channel occupation time, enabling the second device to generate a second signal through back scattering, without requiring battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional communication technologies are used for data transmission, then reliable communication can be achieved, but power consumption and device complexity increase
Solution Approach 1:
The zero-power consumption device utilizes the radio frequency signal from the first device to power its own circuit and generate the backscattering signal, achieving self-service without external power supply. The device harvests energy from the incident signal to enable its communication function.
Solution Approach 2:
The patent replaces the traditional active transmission mechanism with a passive backscattering mechanism. Instead of generating signals actively, the zero-power consumption device modulates the incident signal by changing its scattering properties, thereby achieving communication without active transmission components.
2Device complexity
If zero-power consumption devices are deployed in unlicensed spectrum, then cost and complexity are reduced, but channel access coordination becomes difficult
Solution Approach 1:
The first device monitors the channel during its occupation period and detects when a zero-power consumption device is present and transmitting. Based on this feedback, the first device adjusts its channel access behavior, including extending the occupation period or initiating new occupation periods to accommodate backscattering communications.
Solution Approach 2:
The channel occupation mechanism serves multiple functions: it provides the carrier signal for zero-power consumption devices to backscatter, enables the first device to transmit data, and facilitates channel access coordination in unlicensed spectrum. This multi-functionality resolves the adaptability challenge.
3Reliability
If channel listening is performed before transmission, then channel access reliability is improved, but transmission delay increases
Solution Approach 1:
The first device performs channel listening in advance to secure channel occupation rights before actual data transmission begins. This preliminary action ensures that when transmission starts, the channel is already reserved, minimizing delays during the actual communication phase.
Solution Approach 2:
Once the channel is occupied after listening, the first device maintains continuous channel occupation for the duration needed to complete both initial transmission and subsequent backscattering communications. This continuity eliminates the need for repeated listening cycles, reducing overall transmission delay.
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 efficient and cost-effective data transmission in unlicensed spectrum scenarios, reducing power consumption and complexity while supporting zero-power communication, suitable for Internet of Things applications.
Implementation Method 1
the first signal is used by the second device to generate a second signal
Data Source
AI summary
A data transmission method includes: performing, by the first device, channel listening, and performing channel occupation in a case where a result of the channel listening is that a channel is idle; and transmitting, by the first device, a first signal to a second device during a first channel occupation time; where the first signal is used by the second device to generate a second signal, and the second device is a zero-power consumption device.