Wireless Channel Hopping Timing Adjustment
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Solution Overview
Problem
In wireless multi-hop networks, adjacent communication devices may select the same reception channel, leading to radio wave collisions and packet transmission failures, which existing methods address by changing the reception channel, but this requires re-advertising the channel hopping schedule, consuming additional wireless communication bandwidth.
Innovation Solution
The system detects overlap schedule periods and adjusts the channel hopping timing by extending or reducing the use schedule period of the reception channel, allowing for minimal changes to the reception channel, thereby reducing the need for additional notifications and bandwidth consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reception channel is changed to avoid overlapping with adjacent devices, then packet transmission reliability is improved, but the device complexity increases due to the need to re-advertise channel hopping schedules
Solution Approach 1:
The patent changes the timing parameter of channel hopping rather than the channel frequency itself. By adjusting when channels are hopped (timing offset) instead of which channels are used, the system avoids reception channel overlaps while maintaining the same channel allocation, thus preventing the need for re-advertising schedules and reducing device complexity
Solution Approach 2:
The patent introduces dynamic timing adjustment where each device can independently modify its channel hopping timing offset based on detected overlaps. This dynamic behavior allows the system to adapt to interference conditions without changing the fundamental channel assignment structure, avoiding the need for complex re-advertisement protocols
2Reliability
If the reception channel is changed to prevent radio wave collision, then communication reliability is improved, but wireless communication band usage increases due to additional notification transmissions
Solution Approach 1:
The patent modifies the timing parameter (when channel hopping occurs) rather than the channel parameter (which channel is used). This allows avoiding radio wave collisions by desynchronizing channel usage in time, eliminating the need for additional notification transmissions and thus reducing wireless communication band consumption
3Stability of the object's composition
If the channel hopping schedule is re-advertised to reflect changes, then adjacent devices can synchronize their channel switching, but this consumes additional wireless communication bandwidth
Solution Approach 1:
The patent enables each device to independently adjust its channel hopping timing offset dynamically based on local overlap detection. This decentralized dynamic adjustment maintains synchronization stability without requiring centralized re-advertisement of schedules, thus avoiding additional wireless communication bandwidth consumption
Solution Approach 2:
Each wireless communication device performs self-adjustment of its channel hopping timing based on locally detected overlaps with adjacent devices. This self-service mechanism eliminates the need for other devices to be notified of changes, as each device autonomously adapts its timing to avoid collisions
Data Source
AI summary
One embodiment of the present invention is a wireless communication system including at least a first wireless communication device and a second wireless communication device that periodically switch a reception channel and wirelessly communicate. The first device detects an overlap schedule period during which the first device and the second device use an identical reception channel, based on use schedule periods of the reception channel of both the devices, determines to extend or reduce the use schedule period of the reception channel of the first device, based on the detected overlap schedule period, adjusts the use schedule period of the reception channel of the first device so as to be extended or reduced according to the determination, and switches the reception channel at an expiration time point of the adjusted use schedule period.