Passive RFID Cell Selection for Energy-Harvesting Links
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Solution Overview
Problem
Energy receiver devices, such as passive RFID devices, face inefficiencies in selecting suitable cells for communication with energy transmitter devices, leading to suboptimal energy harvesting and communication quality due to lack of effective cell selection techniques and insufficient information from energy transmitter devices.
Innovation Solution
Energy receiver devices select cells based on cell information and reference signals transmitted by energy transmitter devices, receiving messages identifying cell resources and energy harvesting capabilities, and backscatter the selected cell information to the transmitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If energy receiver devices use traditional cell selection methods, then device complexity is reduced, but energy harvesting efficiency and communication quality deteriorate
Solution Approach 1:
The energy transmitter device transmits cell information and reference signals before the energy receiver device performs cell selection. This preliminary provision of information allows the receiver to make informed selection decisions without complex processing, improving energy harvesting efficiency while maintaining simple device architecture.
Solution Approach 2:
Reference signals serve as an intermediary element between the energy transmitter device and the energy receiver device. These signals carry cell selection information in a standardized format that simplifies the selection process while enabling efficient energy harvesting based on signal quality measurements.
2Measurement precision
If energy transmitter devices transmit detailed cell information, then cell selection accuracy is improved, but information transmission overhead increases
Solution Approach 1:
The patent extracts only the essential cell selection information (cell ID, reference signal resources) from the complete cell data set and transmits it to energy receiver devices. This selective information extraction achieves sufficient selection accuracy while minimizing transmission overhead and avoiding unnecessary information burden.
3Reliability
If energy receiver devices measure multiple reference signals, then cell selection reliability is improved, but time consumption increases
Solution Approach 1:
The energy receiver device measures a limited number of reference signals from a subset of available cells rather than exhaustively measuring all possible cells. This partial measurement approach achieves sufficient selection reliability by focusing on the most promising candidates, thereby reducing the time required for cell selection.
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 enhances energy harvesting and communication quality by ensuring the energy receiver device communicates with a transmitter that supports energy harvesting, improving overall efficiency and effectiveness of the cell selection process.
Implementation Method 1
the energy receiver device may backscatter the cell information to the energy transmitter device
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. In some cases, an energy receiver (e.g., a passive radio frequency identifier (RFID) device) may receive one or more messages from one or more energy transmitters (e.g., network entities), each message identifying a cell associated with an energy transmitter and additional corresponding cell information, and indicating one or more resources on which the energy receiver may receive a reference signal for cell selection from the energy transmitter. The energy receiver may receive the reference signal and perform a measurement on the reference signal. In some cases, the energy receiver may select a cell based on the reference signal (e.g., the measurement) and the energy transmitter supporting energy harvesting. The energy receiver may transmit a second message that indicates the selected cell associated with the energy transmitter.