BLE Tag Advertisement Interval Adjustment for Channel Congestion
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Solution Overview
Problem
Bluetooth Low Energy (BLE) tags experience high collision rates in high density environments due to limited channel availability, making it difficult to track devices effectively in crowded settings with tens of thousands of tags.
Innovation Solution
A device analyzes channel usage and tag characteristics to select a subset of BLE tags, instructing them to increase the interval between advertisements, thereby reducing channel usage pressure and minimizing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If BLE tags use limited advertisement channels in high density environments, then channel usage is reduced, but collision rate increases significantly
Solution Approach 1:
The patent implements dynamic advertisement interval adjustment where BLE tags modify their transmission intervals based on real-time channel conditions and collision rates. Tags transition from fixed intervals to adaptive intervals, increasing intervals when collisions are detected and decreasing them when channels are clear, thereby dynamically optimizing the balance between channel usage and tracking reliability
Solution Approach 2:
The system changes the transmission parameter (advertisement interval) of BLE tags to resolve the contradiction. By adjusting the time interval between advertisements as a variable parameter rather than a fixed value, the system can reduce channel congestion while maintaining sufficient tracking accuracy through parameter optimization
2Measurement precision
If BLE tags increase advertisement frequency to improve tracking accuracy, then tracking precision improves, but channel collision rate increases
Solution Approach 1:
The patent implements periodic collision detection and adaptive interval adjustment cycles. BLE tags operate in cycles of advertisement, collision detection, and parameter adjustment, transitioning from continuous high-frequency advertising to periodic adaptive advertising that maintains tracking precision while reducing overall collision rates through rhythmic transmission patterns
Solution Approach 2:
The system establishes a feedback loop where collision information from receiving devices is fed back to transmitting BLE tags. Tags use this feedback to adjust their advertisement intervals, increasing intervals when feedback indicates high collision rates and maintaining or decreasing intervals when tracking precision deteriorates, thereby dynamically balancing precision and collision rate
3Area of stationary object
If more BLE tags are deployed in high density environments, then coverage area increases, but channel congestion worsens
Solution Approach 1:
The patent segments the channel usage by implementing different advertisement intervals for different tags based on their characteristics and environmental conditions. Instead of uniform high-frequency advertising across all tags, the system divides tags into groups with different transmission strategies, allowing expanded coverage while managing overall channel congestion through segmented resource allocation
Data Source
AI summary
In one embodiment, a device obtains telemetry data indicative of channel usage by a plurality of Bluetooth Low Energy (BLE) tags. The device also obtains tag characteristic data indicative of one or more characteristics of the BLE tags. The device determines that usage of a particular channel by the BLE tags exceeds a predefined threshold, based on the obtained telemetry data. The device selects a subset of the plurality of BLE tags, based on their one or more characteristics indicated by the obtained tag characteristic data. The device instructs, for each of the selected subset of BLE tags, the selected BLE tag to increase an interval of time between BLE advertisements sent by the selected BLE tag.