Terrestrial Trunked Radio (TETRA) Technology

TETRA Seminar Topics, Abstracts, Free Reports, PPT, IEEE Presentation, Documentation, PDF and DOC downloads for ECE/CSE/IT Students

Terrestrial Trunked RAdio (TETRA) standard was designed to meet some common requirements and objectives of the PMR and PAMR market alike. One of the last strong holds of analog technology in a digital world has been the area of trunked mobile radio. Although digital cellular technology has made great strides with broad support from a relatively large number of manufactures, digital trunked mobile radio systems for the Private Mobile Radio (PMR) and Public Access Mobile Radio (PAMR) market have lagged behind. Few manufacture currently offer digital systems, all of which are based on proprietary technology. However, the transition to digital is gaining momentum with the emergence of an open standard TETRA. TETRA is a Digital PMR Standard developed by ETSI. It is an open standard offers interoperability of equipment and networks from different manufacturers. It is potential replacement for analog and proprietary digital systems

Standard originated in1989 as Mobile Digital Trunked Radio System (MDTRS), later renamed to Trans European Trunked Radio, and is called TETRA since 1997.TErrestrial Trunked Radio TETRA is the agreed standard for a new generation of digital land mobile radio communications designed to meet the needs of the most demanding Professional Mobile Radio networks (PMR) and Public Access Radio (PAMR) users. TETRA is the only existing digital PMR standard defined by the European Telecommunications Standard Institute (ETSI). Among the standard's many features are voice and extensive data communications services. Networks based on the TETRA standard will provide cost-effective, spectrum-efficient and secure communications with advance capabilities for the mobile and fixed elements of companies and organizations. As a standard, TETRA should be regarded as complementary to GSM and DECT

The main advantages of TETRA over other technologies (such as GSM) are:
The much lower frequency used gives longer range, which in turn permits very high levels of geographic coverage with a smaller number of transmitters, thus cutting infrastructure costs.
During a voice call, the communications are not interrupted when moving to another network site. This is a unique feature which dPMR and DMR do not offer.
High spectral efficiency - 4 channels in 25 kHz and no guard bands, compared to GSM with 8 channels in 200 kHz and guard bands.
Very fast call set-up - a one to many group call is generally set-up within 0.5 seconds (typical less than 250 msec for a single node call) compared with the many seconds (typically 7 to 10s) that are required for a GSM network.
The system contains several mechanisms, designed into the protocols and radio parameters, to ensure communication success even during overload situations (e.g., during major public events or disaster situations), thus calls will always get through unlike in cellular systems. The system also supports a range of emergency calling modes.
TETRA infrastructure is usually separate from (but connected to) that of the public (mobile) phone networks, resulting in (normally) no call charges for the system owners, substantially more diverse and resilient communications and it is easy to customise and integrate with data applications (vehicle location, GIS databases, dispatch systems, etc.).

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