CelloTrack LTE Plus Overview
CelloTrack LTE Plus Overview.docx Page 26 of 39
Copyright © 2019 by Pointer Telocation, Ltd.
The following figure shows the stages of Glancing.
The current consumption in Glancing depends on the distance to the GSM
communication base and communication network conditions.
If there is a GSM registration fault, the modem is switched off before the programmed
time in order to conserve power. The Glancing event messages that were not
transmitted are stored in the unit’s message queue for the next Glancing session (if
storing to memory is enabled).
5.2.2
Specific Time Glancing
Glancing can be configured to occur at a specific time of the day to enable the
reception of status updates from all the units of the fleet concurrently. To prevent
communication server overload due to multiple simultaneous transmissions, a
randomization algorithm is implemented: when the appointed time arrives, each unit
calculates a random time offset and transmits its update. The result is that all the
transmissions are grouped around the specified time, some before, some after.
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NOTE:
Specific Time Glancing can only be enabled if the GNSS has acquired a valid fix
(location and time) at least once in the past.
If the unit is not in the Hibernation state when the specified time occurs (for example,
it is in the Tracking state), the Glancing message is still transmitted.
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5.2.3
Not Live Tracking
In Not Live Tracking the unit does not enter the Tracking state; however, it sends start
and stop messages when motion is detected or ends.
If both Not Live Tracking and Error! Reference source not found. are enabled, and
he unit is in the Hibernation state, then when motion is detected the unit immediately
GSM
Registration
t
t
Glancing begins
30
seconds
GNSS
GSM
GPS has successfully
accomplished an acquisition or
the GPS timeout has expired
A successful glancing
event is generated
Glancing ends
2 minutes minimum
GPRS
Dial up
