BLE Beacon Channel Selection for Low-Interference Tag Scheduling
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Solution Overview
Problem
Signal interference occurs during tracking of objects with multiple tags or labels transmitting on the same channel, leading to lost data and increased power consumption, particularly in high-density systems with external interference.
Innovation Solution
A Bluetooth low energy (BLE) system with an antenna and signal conditioning elements to attenuate frequencies outside a selected range, converters to convert signals into voltage, a comparator to identify the least busy channel, and processors to transmit beacon signals on that channel, optionally using energy harvesters for power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple tags transmit on the same channel simultaneously, then data transmission efficiency is improved, but signal interference increases leading to lost data and higher power consumption
Solution Approach 1:
The system performs preliminary channel assessment by having tags sense channel activity before transmitting beacon signals. Tags evaluate the busy status of available channels in advance and select the least busy channel for transmission, thereby avoiding simultaneous transmissions on the same channel and preventing signal interference before it occurs.
2Reliability
If tags continuously monitor all channels for interference, then transmission reliability is improved, but power consumption increases
Solution Approach 1:
Instead of continuously monitoring all channels, the system performs partial monitoring by assessing only the necessary channel parameters (busy status) at specific intervals before transmission. This partial action approach provides sufficient information for reliable channel selection without the excessive power consumption of continuous full-spectrum monitoring.
3Area of stationary object
If tags transmit beacon signals at high power, then transmission range is improved, but interference with other channels increases
Solution Approach 1:
The system applies local quality by selecting specific transmission channels based on their individual busy status. Each tag transmits on the channel with the lowest activity level, concentrating transmission energy locally on underutilized channels rather than uniformly across all channels. This reduces interference with other channels while maintaining adequate transmission range on the selected channel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces interference and power consumption by selecting the least busy channel for transmission, improving data quality and minimizing power usage without requiring discrete battery sources.
Implementation Method 1
an antenna configured to receive radiofrequency signals from a surrounding environment
Implementation Method 2
a set of first signal conditioning elements coupled to the antenna, the set of first signal conditioning elements each being associated with a different channel and being configured to attenuate frequencies of the received radiofrequency signals outside a selected frequency range for a corresponding channel
Implementation Method 3
a set of converters each having an input operatively coupled to a corresponding one of the set of first signal conditioning elements, the set of converters each configured to convert attenuated signals from each corresponding first signal conditioning element into a voltage
Data Source
AI summary
The technology relates to a wireless system that can be used indoors or outdoors, and is configured to reduce interference of beacon signals on channels used by the system. Aspects of the technology provide for evaluation of channel activity to determine an optimal transmission channel. This is beneficial where there is a high density of tags that may be configured for data transmission. Tags may include an antenna to receive signals; a set of first conditioning elements to attenuate received signals corresponding with system channels; a set of converters and a set of second conditioning elements to prepare attenuated signals for analysis; a comparator to determine which attenuated signal corresponds to a channel having the lowest power level; and a processor to transmit a beacon signal to a reader apparatus on the channel with the lowest power level.