651748.fig.0031a
(a) B-MAC generates long preambles and receivers need approximately. 350 μs to detect it; B-MAC runs only on radios that support a low-level access to individual frame bits
651748.fig.0031b
(b) TICER emulates long preambles by sending consecutive beacon frames; nodes need almost a millisecond to receive a beacon and detect channel activity. Although TICER achieves worse results than B-MAC, it works with all transceivers
Figure 31: There is the optimal preamble length in solutions based on preamble sampling; the results show the lifetime for various duty cycle, that is, nodes send frames once a minute, once an hour and every 12 hours.