Wireless Charging Communication Timing Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining real-time information transmission during wireless power transmission due to potential timing shifts caused by collision avoidance control, which can disrupt the fixed periodicity required for information exchange between charging apparatuses and objects being charged.
Innovation Solution
A wireless communication system employing backoff control, where one wireless communication apparatus transmits a signal with a first period, and the second apparatus responds with a second signal after a fixed delay shorter than the first period, thereby avoiding communication collisions and maintaining regular transmission timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collision avoidance control is applied to wireless communication during power transmission, then collision probability is reduced, but transmission timing becomes shifted and fixed periodicity is disrupted
Solution Approach 1:
The patent implements periodic transmission of charge information at fixed intervals (e.g., every 100ms) regardless of collision avoidance backoff delays. The transmission timing is synchronized to a predetermined period, ensuring that charge information is exchanged regularly between the power transmission apparatus and the charging apparatus, thus maintaining fixed periodicity while still employing collision avoidance mechanisms.
2Reliability
If backoff control is used for regular communication, then collision probability is reduced, but real-time information exchange is compromised
Solution Approach 1:
The patent establishes a predetermined transmission period for charge information before actual transmission begins. This preliminary timing arrangement ensures that both the power transmission apparatus and charging apparatus are synchronized to transmit at known intervals, enabling real-time information exchange without the need for dynamic backoff control that would introduce timing uncertainties.
3Reliability
If carrier sense multiple access/collision avoidance is implemented, then collision probability is reduced, but transmission efficiency is decreased due to extended waiting periods
Solution Approach 1:
The patent changes the parameter of transmission timing from dynamic backoff-based intervals to fixed periodic intervals. By setting a predetermined transmission period (e.g., Tpc) for charge information, the system eliminates the need for extended waiting periods associated with CSMA/CA backoff control, thereby improving transmission efficiency while maintaining collision avoidance through the structured periodic timing arrangement.
Data Source
AI summary
A wireless communication system is a wireless communication system that adopts backoff control. The wireless communication system is provided with: a first wireless communication apparatus; and a second wireless communication apparatus. The first wireless communication apparatus transmits a first signal to the second wireless communication apparatus with a first period, and the second wireless communication apparatus transmits a second signal to the first wireless communication apparatus with a delay of a fixed time, which is shorter than one period of the first period, from a time point at which the first wireless communication apparatus transmits the first signal.