Wireless Power Transfer Apparatus Channel Sensing for Interference Mitigation
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Solution Overview
Problem
In wireless powered communication networks, wireless power transfer apparatuses interfere with wireless communication systems when using the same frequency band, leading to performance degradation and unsuccessful communication due to simultaneous transmission of power and data signals.
Innovation Solution
Implementing a control method for wireless power transfer apparatuses that perform DCF-based contention with communication terminals, transmit energy frames only after winning contention, and determine power transfer modes based on residual energy states and channel busy/idle states to minimize interference and optimize power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless power transfer apparatus transmits power signal without checking channel status, then power transfer efficiency is improved, but interference with wireless communication system increases
Solution Approach 1:
The wireless power transfer apparatus performs channel sensing before transmitting power signals to ensure the channel is idle. This preliminary check prevents interference with ongoing wireless communications while maintaining efficient power transfer by only transmitting when the channel is clear.
Solution Approach 2:
The patent introduces a coordination mechanism where wireless power transfer apparatuses act as intermediaries that sense channel status and adjust their transmission accordingly. This mediator approach allows the system to balance power transfer efficiency with communication reliability by making intelligent transmission decisions.
2Object-affected harmful factors
If wireless power transfer apparatus performs DCF-based contention process, then interference with wireless communication is reduced, but power transfer time increases
Solution Approach 1:
The wireless power transfer apparatus performs only partial contention processes - specifically channel sensing and selective transmission - rather than full DCF contention. This partial action reduces the time overhead while still providing sufficient interference mitigation by checking channel status before transmission.
3Speed
If wireless power transfer apparatus transmits power signal simultaneously with data signal, then power delivery speed is improved, but communication reliability deteriorates
Solution Approach 1:
The system uses periodic channel sensing and selective transmission - transmitting power signals only during periods when the channel is sensed to be idle. This periodic action ensures fast power delivery when possible while maintaining communication reliability by avoiding simultaneous transmissions that would cause interference.
Data Source
AI summary
Provided are a control method for a wireless power transfer apparatus considering interference in wireless powered communication networks, and a wireless power transfer apparatus. The control method of the wireless power transfer apparatus includes: performing, by at least one wireless power transfer apparatus, a distributed coordination function (DCF) based contention process with at least one wireless communication terminal; and transmitting, by the wireless power transfer apparatus which won in the DCF based contention process, an energy frame to the at least one wireless communication terminal.