Table 5: Symbols used in the model.

Symbol Description

𝐸 d a y Daily energy consumption
𝐸 L E T E D LETED energy consumption
𝐸 L D C Energy consumption of the underlying low-duty cycle protocol
𝐸 t x b e a c o n , 𝐸 r x b e a c o n Energy consumed to send and to receive beacons during a day
𝐸 t x _ s l o t s , 𝐸 r x _ s l o t s Energy consumed in a day for sending and receiving data
𝐸 m c u Daily energy consumption of 𝜇 𝐶
𝐸 m c u a c t i v e Daily energy consumption of 𝜇 𝐶 in active mode when radio is powered down
𝐸 s l e e p Daily energy consumption when the node sleeps
𝑡 r x _ a c t i v e , 𝑡 r x _ p a s s i v e Length of rx active/passive slot
𝑡 t x b e a c o n Transmission time of a single beacon
𝑡 r x b e a c o n Average reception time of a single beacon
𝑡 r x b e a c o n a f t e r Listening time after sending a beacon
𝑡 g u a r d Guard time for clock drift compensation
𝑡 f r a m e Transmission time of single data frame
𝑡 p r e a m b l e Time to send or receive the preamble with the start of frame delimiter field
𝑇 s l e e p Total sleep time in a day
𝑇 s l o t LETED slot period needed to support certain end-to-end delays
𝑇 d a y The number of time units (e.g., seconds) a day that the beacon period 𝑇 b e a c o n is expressed (e.g., 𝑇 d a y equals 86 400 seconds a day, when 𝑇 b e a c o n is expressed in seconds)
𝑁 a c t i v e , 𝑁 p a s s i v e Number of active/passive slots a day (LETED solution)
𝐵 The number of beacons a node sends during a day