Electromagnetic compatibility and Radio spectrum Matters (ERM); Digital Private Mobile Radio (dPMR) using FDMA with a channel spacing of 6@25 kHz (V2.3.1)
The present document covers digital Private Mobile Radio (dPMR) equipment using FDMA technology with channel spacing of 6@25 kHz supporting voice and data applications capable of operating in the existing licensed land mobile service frequency bands below 1 000 MHz. The present document includes the baseband signal processing parameters of the physical layer and the protocol structure at the air interface. The protocol supports different levels of functionality from peer to peer mode to managed base station access mode: Mode 1 Peer to peer (direct mode) operation without Base Stations or infrastructure. Mode 2 dPMR systems incorporating one or more Base Stations for repeating or providing system gateways. Mode 3 dPMR systems operating under a managed access mode in systems incorporating one or more Base Stations. All three modes of operation of the present air interface are designed to be compliant with the appropriate harmonized standard for spectrum use@ EN 301 166-2 [4]. A polite spectrum access protocol for sharing the physical channel has also been specified.