Understanding GPS Thresholds for Map Updates

Jul 23, 2015 - Author: Sierra Wireless - 1108 Views
Basic Event Thresholds

The Fastest Report Interval specifies the minimum amount of time before the next location event is generated. For example, if the Fastest Report Interval is set to 5 seconds, the oMG will generate a location event (SLLA) no quicker than 5 seconds. Note that this doesn't mean that it will generate a location event every 5 seconds.

The oMG must be moving for it to generate a location event. When it is moving and has exceeded either the speed or distance threshold, then the location event will be sent up to the oMM no quicker than 5 seconds.

In the following example screenshot, the Fastest Report Interval is set to 5 seconds, the High Speed threshold is set to 8km/h and the High Distance threshold is set to 18.0m.

When driving down the highway, the GPS will be sent to the oMM every 5 seconds, unless you are driving less than 8km/hr or have moved less than 18.0m.

If the vehicle stops at a light for two minutes, then it is not covering distance or going fast enough to exceed the thresholds, so no GPS event (778 SLLA location) is sent to the oMM. Once the light goes green, the speed will exceed the threshold of 8km/hr or the distance will exceed 18.0m, at which point an event will be sent every five seconds.

If the vehicle is moving really slowly (less than 8km/hr), no GPS event will be sent to the oMM until it covers 18m.

Critical Thresholds

The critical thresholds are only for high cost links and the oMG will send fewer events on a high cost link. Therefore the vehicle must drive faster or move further in order for an event to be sent to the oMM. 

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