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App RFID LLRP Inventory - Mobility Profile

The following configuration options define the Mobility Profile values. These values are used in the Location algorithm as an adjustment function which will decay RSSI values over time. This offset value is then applied to the existing Tag's Location and compared to the non-adjusted average. Positive offset values will increase the likelihood of a tag staying in the same location, whereas negative offset values will increase the likelihood that the tag will move to the new location it was just read at.

The main goal of the Mobility Profile is to provide a way to customize the various tradeoffs when dealing with erratic data such as RSSI values. In general there is a tradeoff between responsiveness (how quickly tag movement is detected) and stability (preventing sporadic readings from generating erroneous events). By tweaking these values you will be able to find the balance that is right for your specific use-case.

Suppose the following variables:

  • incomingRSSI Mean RSSI of last windowSize reads by incoming read's location
  • existingRSSI Mean RSSI of last windowSize reads by tag's existing location
  • offset Result of Mobility Profile's computations

The location will change when the following equation is true: - incomingRSSI > (existingRSSI + offset)

Mobility Profile Diagram

Configure Mobility Profile

See the Mobilitysettings in the Application Settings section of the service's configuration.

Example Mobility Profile Values

Here are some example mobility profile values based on our previous experience. These values can be used as a reference when creating your own Mobility Profile.

Asset Tracking - Uses default mobility profile values

Asset Tracking
Slope -0.008
Threshold 6.0
Holdoff Millis 500.0

Retail Garment - Uses alternate mobility profile values

Retail Garment
Slope -0.0005
Threshold 6.0
Holdoff Millis 60000.0