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The STP-mode is most energy-consuming because the reporting interval will be highest and also the door sensor needs to be monitored.
The reporting interval is 1 ms at shortest which enables accurate adaptation to the fading radio channel especially in microcells with slow user terminal velocities (0 to 15 km/h) [17].
753 completed the reporting interval [ 6].
Nevertheless, Shephard [ 63] argued that "because of limitations in human memory, the reliability of information generally decreases with the length of the period surveyed"and that therefore "it is best to keep the reporting interval relatively short (no longer than 3 months)"(p. 199).
Similar(56)
The report interval has been rescaled to 180 s.
The report interval always begins with an always-on setup period.
Here, the report interval refers to an period that each message must be transmitted and the interval is equal to beacon interval (BI) in vehicular safety applications.
We can conclude that in case a battery lifetime of 1 3 years is desired, either the report interval or the number of days in STP must be limited.
Since the number of days in STP is dependent on the usage of the container, the only possibility is to let the report interval vary based on the value of the cargo and the days already spent in STP.
Combining both conclusions, we can assume the following: Tracking devices in the envisaged system can have a battery lifetime of 1 3 years if either enough tracking devices share one UMTS/GPRS/GPS connection or if the report interval can be varied.
For the most part, the reported intervals agree with the highest-scoring intervals found by our window-free method.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com