Ccr | Tetra | 2020-09-28

Norwegian Public Roads Administration Welcomes TETRA DMO Gateway in Hemsedalsfjellet Area

Source: The Critical Communications Review | Gert Jan Wolf editor

Norwegian Public Roads Administration's plowing crew uses Nødnett in their daily work and in some areas within the Hemsedalsfjellet region, they experiences problems with a weak or no coverage of Nødnett radio coverage.

The Norwegian Public Roads Administration's DMO Gateway in ther Hemsedalsfjellet area has been put into operation.

The Norwegian Public Roads Administration's plowing crew uses Nødnett in their daily work and in some areas within the Hemsedalsfjellet region, they experienced problems with a weak or no coverage of Nødnett TETRA coverage. 

The Norwegian Public Roads Administration's plowing crew has experienced that they are not able to get in touch with the Road Traffic Center during plowing in some places along Main road 52 over Hemsedalsfjellet, especially in bad weather. Therefore, the Norwegian Public Roads Administration and DSB have set up a DMO Gateway in oder to secure coverage and communications in the area.

The DMO Gateway was installed in a mast owned by Telenor. This improvement provides DMO coverage on a stretch of approximately 14 km in the relevant area.

When a radio terminal is connected to Nødnett, it is in Trunked Mode Operation (TMO). Through TMO, the radio terminal gets access to functions in Nødnett. There will be areas both indoors and outdoors where there is no Nødnett coverage. The mentioned stretch of RV52 over Hemsedalsfjellet is an example of this. In such cases, radio terminals can be connected in Direct Mode Operation (DMO) so that they can communicate locally in common DMO voice groups without being connected to Nødnett. Some radio terminals can be set up with a function called Gateway. This function acts as a link between radio terminals in DMO and radio terminals connected to Nødnett. 

Picture: Courtesey of Jon-Eric Melsæter under creative commons