GPS → AAVL


The "Autonomous Automatic Vehicle Location" (AAVL) feature adds the ability for GPS-equipped GeminiG3 to initiate "Here I am" position message transmissions. AAVL allows the system designer to specify the maximum distance or the time interval between position reports:

The "Dynamic Bandwidth Allocation" (DBA) protocol's "Out Of Band" (OOB) mechanism is used to deliver these "Automatic Vehicle Location" (AVL) reports.

Report every (*2) meters

"Maximum Distance Between Reports"

Distance Interval - the vehicle sends a position update each time it has moved this distance (unless the minimum time interval has not yet elapsed).

The mobile firmware saves the last-transmitted position, and compares it with the current (latest OOB update) position.

Report every (*10) seconds

This parameter controls the "Maximum Time interval between position Reports".
Thus, the vehicle will send a position update every time "this interval has elapsed" guaranteeing delivery of position reports at least this often.
Data traffic and ACKs will generate additional reports at shorter intervals.

At least (*10) seconds between reports

"Minimum Reporting Interval"

At most, the vehicle sends a position update every time this interval, in seconds, has elapsed.

The main purpose of the MRI parameter is to protect the network from being overloaded by excessive AVL reporting from one or a few mobiles.

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