There is a standardized option for the transmission of position information from DMR radios over the network. The LIP protocol it-self has been taken from ETSI-TETRA, it allows for the transmission of localization data in an interoperable format and for the Over the Air configuration / modifications of triggers.
The DMR radio will transmit its position data upon receive of a trigger, examples for trigger criteria are:
- PTT
- Emergency Call
- Periodic every x seconds
- Distance travelled
- Immediate on demand of the dispatcher
To get full benefit for large fleets of users the DMR Associations has developed a highly efficient method for the transmission of localization data over the network that is capable to poll up to 1000 DMR radios per site on a single channel. In technical terms we call it USBD Data Polling over the Control Channel Alternate slot.
