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With more than 4 billion devices produced in 2020, Bluetooth and BluetoothLow Energy (BLE) have become the backbone of the Internet of Things. Bluetoothand BLE mitigate interference in the crowded 2.4 GHz band via AdaptiveFrequency Hopping (AFH), spreading communication over the entire spectrum, andfurther allows the exclusion of interfered channels. However, exclusion ischallenging in dynamic environments or with user mobility: as a user movesaround, interference affects new channels, forcing AFH to deprive itself of newfrequencies, while some other excluded channels are now free of losses butremain excluded. Channel re-inclusion is a primordial, yet often left out,aspect of AFH, as it is non-trivial to assess the new situation of excludedfrequencies. We present eAFH, a mechanism for channel exclusion and inclusion.eAFH introduces informed exploration to AFH: using only past measurements, eAFHassesses which frequencies we are most likely to benefit from re-including inthe hopping sequence. As a result, eAFH adapts in dynamic scenarios whereinterference varies over time. We show that eAFH achieves 98-99.5% link-layerreliability in the presence of dynamic Wifi interference with 1% controloverhead and 40% higher channel diversity than state-of-the-art approaches.

eAFH: Informed Exploration for Adaptive Frequency Hopping in Bluetooth Low Energy