We experienced and mitigated similar behaviour in our BluetoothLocationEngine™. The channels use different radio frequencies that, in turn, results in fading of the signal at different distances. Moving obstacles, for example people, will cause significant variation in RSSI.īluetooth LE advertising moves pseudo-randomly between radio channels. However, you should keep in mind that environmental factors can often cause variation much larger than the 4 to 6 dBm found in this test. RSSI varying without a change of distance might cause more spurious triggering. Signal stability is more important when you are using the RSSI to infer distance, either directly from the RSSI itself or indirectly via, for example, the iOS immediate, near and far indicators. Firstly those with very stable RSSI and secondly those with an RSSI that had a standard deviation between about 4 and 6 dBm. We found that beacons belonged to one or two groups. Smaller bars are better and represent beacons
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