technology

TETRA, a cellular network for public service professionals

TETRA or Terrestrial Trunked Radio is a specification for professional mobile radio. It was designed specifically with emergency services, public safety networks, the military and other government services in mind. The ETSI standard for Tetra was first published in 1995.

TETRA uses Time Division Multiple Access (TDMA) with four user channels on one radio carrier and 25 kHz spacing between carriers. Both point-to-point and point-to-multipoint transfer can be used. Digital data transmission is also included in the standard though at a low data rate.

TETRA Mobile Stations (MS) can communicate direct-mode operation (DMO) or using trunked-mode operation (TMO) using switching and management infrastructure (SwMI) made of TETRA base stations (TBS). As well as allowing direct communications in situations where network coverage is not available, DMO also includes the possibility of using a sequence of one or more TETRA terminals as relays. This functionality is called DMO gateway (from DMO to TMO) or DMO repeater (from DMO to DMO). In emergency situations this feature allows direct communications underground or in areas of bad coverage.

TETRA provides for authentication of terminals towards infrastructure and vice versa. For protection against eavesdropping; air interface encryption and end-to-end encryption is available. There are several advantages of using TETRA over other regular GSM or UMTS standards:

Contact us if you would like more information on the services we can provide related to TETRA networking.

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