Wireless Gate Control Frequency Hopping Synchronization
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Solution Overview
Problem
Current radio methods for gates face challenges in achieving low energy consumption, fast and reliable connection setup, worldwide frequency band compatibility, safe operation amidst other radio systems, and cost-effective, reliable hardware components, particularly in ensuring quick data transmission and minimizing interference.
Innovation Solution
A radio method using frequency hopping in the 2.4 GHz band with adaptive channel selection and synchronization, employing a channel occupancy table to determine and maintain channels with good transmission quality, allowing for efficient data transmission and minimizing interference, while using inexpensive components and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping method is used in the 2.4 GHz band, then interference from other radio systems is reduced and transmission reliability is improved, but device complexity and implementation cost increase
Solution Approach 1:
The patent implements dynamic frequency hopping where the radio link adapts its operating frequency over time according to a predefined pattern. The system dynamically switches between multiple frequency channels (e.g., 2.402 GHz to 2.480 GHz) to avoid interference and optimize transmission reliability, rather than using a fixed frequency.
Solution Approach 2:
The patent changes the frequency parameter of the radio transmission dynamically. By varying the operating frequency across a range of channels in the 2.4 GHz band, the system adapts to changing interference conditions and maintains reliable communication without requiring complex adaptive algorithms.
2Reliability
If adaptive channel selection with channel occupancy table is implemented, then transmission quality is improved and interference is minimized, but energy consumption and processing load increase
Solution Approach 1:
The patent performs preliminary channel assessment by building and maintaining a channel occupancy table that records which frequency channels are currently occupied by other radio systems. This pre-knowledge allows the frequency hopping sequence to proactively select clear channels, avoiding interference without requiring real-time sensing and decision-making that would consume additional energy.
3Loss of time
If quick synchronization is implemented for battery-operated mobile units, then connection establishment time is reduced, but energy consumption during synchronization increases
Solution Approach 1:
The patent implements periodic synchronization where the mobile unit and stationary control establish their frequency hopping sequences at predetermined intervals or upon activation. The synchronization uses a predefined hopping pattern that both devices follow, allowing quick re-synchronization without extensive negotiation, thus reducing both time and energy consumption compared to continuous or on-demand synchronization protocols.
Data Source
Figure 1
Figure 2~3
AI summary
The method involves executing channel hops in a time raster between (0.625 -10) millisecond adaptively selecting the channels utilized for frequency-hopping method. A complete communication cycle is provided comprising an incoming data transmission, and a response takes place on the channel within the time raster. The number of transmitted data is adapted to the useful data that must be transmitted. The establishment of a connection is synchronized between a stationary unit (12) and a mobile unit (4) on an adaptively predetermined synchronization channel.