Hi Blacktruck
Sorry could not reply to you earlier. The signal is generated when price goes back into the one deviation bollinger bands. Assume you are using a CCI 10 as indicator, you can see this better on the price chart by putting a BB (10,1) around price. and it is much better than the standard CCI 10 cause the signal lines (on CCI 10) are horizontal, while the signal lines of the 10,1 bands are either in an uptrend, sideways or downtrend. When they contract/expand this has implications on projecting volatility as well - but that is another story, in a way I find them more useful than VIX which is late more often than not.
More to come later.
Enjoy