Trunk­ed ra­dio

Trunked radio is a modern form of private/professional mobile radio (PMR) where several users share one channel. Dynamic channel allocation enables more efficient use of the limited number of radio frequencies available for these applications. Alongside a wide range of businesses mostly using technologies such as digital mobile radio (DMR), emergency and public safety services and organisations have recognised the benefits of trunked radio. Its acceptance has led to standardisation of digital narrowband and wideband trunked radio technologies such as TETRAPOL, TETRA and TEDS for emergency and public safety purposes. Other standardisation activities are still in progress within various bodies such as 3GPP for future wideband radio applications for emergency and public safety use based, for instance, on LTE technology.