Zero-Power Communication Using Preassigned Uplink Resources
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Solution Overview
Problem
Existing zero-power devices face challenges in efficiently utilizing harvested energy for communication, particularly in scenarios where energy harvesting efficiency is low, leading to increased data transmission delays and collisions among terminals.
Innovation Solution
A method for zero-power communication that allows devices to actively initiate communication without network scheduling, using a first transmission mode that includes identity information, supporting both backscatter and active transmission modes, and utilizing pre-configured or network-configured frequency and time domain resources to reduce collisions and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If zero-power devices use traditional network-scheduled communication mode, then network control is maintained, but data transmission delay increases and communication efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring uplink resources for zero-power devices before they need to transmit data. The network device allocates and notifies devices of their designated time-frequency resources in advance, so when data needs to be transmitted, the device can immediately use the pre-assigned resources without waiting for network scheduling, thereby reducing transmission delay and improving communication efficiency.
2Use of energy by moving object
If zero-power devices harvest energy from environment, then power consumption is reduced, but energy harvesting efficiency is low leading to insufficient power for communication
Solution Approach 1:
The patent applies parameter changes by adjusting communication parameters to match the limited energy availability of zero-power devices. The network device configures appropriate transmission power levels, modulation schemes, and resource allocation based on the harvested energy characteristics, enabling reliable communication despite low energy harvesting efficiency.
3Speed
If multiple zero-power devices transmit simultaneously, then communication speed increases, but collisions among terminals increase
Solution Approach 1:
The patent applies segmentation by dividing the communication resources (time and frequency) into separate segments for different zero-power devices. Each device is assigned specific uplink resources, which segments the transmission space and prevents simultaneous collisions. This allows multiple devices to communicate in parallel without interfering with each other, maintaining high communication speed while eliminating collisions.
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
Improves data transmission performance, reduces delay, and minimizes collisions by enabling zero-power devices to initiate communication as needed, ensuring efficient energy utilization and accurate identification.
Implementation Method 1
A zero-power device acquires power for communication by harvesting energy (such as radio frequency (RF) energy, optical energy, thermal energy, mechanical energy, and kinetic energy) from the environment
Implementation Method 2
In terms of the communication mode, backscattering is supported, or active transmission is further supported
Data Source
AI summary
A method for zero-power communication is provided in the present disclosure. The method is applicable to a zero-power device. The method includes: transmitting a communication signal using a first transmission mode, wherein in the first transmission mode, communication is initiated by the zero-power device, and the communication signal includes identity information of the zero-power device.