Private Mobile Radio
Private Mobile Radio (PMR) - sometimes called Professional Mobile Radio - was developed for business users who need to keep in contact over relatively short distances with a central base station / dispatcher - a typical example is a taxi company. PMR is also widely used by emergency services. PMR networks consist of one or more base stations and a number of mobile terminals. Such a system serves a closed user group and that is normally owned and operated by the same organization as its users.
From their early designs, PMR systems have developed into 'trunked' systems, the most notable of which is TETRA, Terrestrial Trunked Radio. Trunking is a technique where the resources of the communications network are shared, thus providing both flexibility and economy in the allocation of network resources. Typically, a communication channel is allocated for the duration of a call and then automatically released to allow it to be used for another call, perhaps between different users on the same system. The technique also enables multiple base stations to be connected and to provide coverage across a wider area than with a single base station.
PMR systems generally provide facilities for closed user groups, group call and push-to-talk, and have call set-up times which are generally short compared with cellular systems. Many PMR systems allow Direct Mode Operation in which terminals can communicate with one another directly when they are out of the coverage area of a network.
PMR systems may also be developed to allow public access (by subscription), and they are then known as Public Access Mobile Radio (PAMR). The users of PAMR systems are usually not the same as the system's owner and operator. Traditionally, PMR systems have usually been based on European standards for the equipment, but operated under licence and subject to National frequency management plans. An exception is PMR 446, a consumer 'walkie-talkie' which has six analogue channels allocated in most European countries for use without a licence.
TETRA , Terrestrial Trunked Radio, is a PMR/PAMR system developed by ETSI to respond to the increasing requirements of commercial services and emergency services, and to give the possibility for cross-border networks in Europe.
Digital Mobile Radio (DMR) is a new European standard, produced by ETSI, defining a direct digital replacement for analogue PMR.
Electromagnetic compatibility for PMR/PAMR
Electromagnetic Compatibility (EMC) requirements for PMR/PAMR are covered by EN 301 489 part 1 and part 5.
Spectrum requirements for PMR/PAMR
ETSI works with the relevant European organizations to ensure that appropriate spectrum is available for ETSI radio standards. The Institute has produced a series of System Reference Documents that define the spectrum requirements for various PMR implementations, and a range of Harmonized Standards that may be used to demonstrate compliance of equipment and components with the European Commission's R&TTE Directive (1999/5/EC).
The following is a list of recently published and frequently downloaded standards. Please use the ETSI Work Programme to find further related standards.
|Standard No.||Standard Title|
|EN 301 489-1||ElectroMagnetic Compatibility (EMC) standard for radio equipment and services;
Part 1: Common technical requirements
|EN 301 489-5||ElectroMagnetic Compatibility (EMC) standard for radio equipment and services;
Part 5: Specific conditions for Private land Mobile Radio (PMR) and ancillary equipment (speech and non-speech)
|EN 300 113||Land mobile service;
Technical characteristics and test conditions for radio equipment intended for the transmission of data (and speech) and having an antenna connector
|EN 300 086||Land Mobile Service; Radio equipment with an internal or external RF connector intended primarily for analogue speech|
|EN 300 219||Land Mobile Service; Radio equipment transmitting signals to initiate a specific response in the receiver|
|EN 300 296||Land Mobile Service; Radio equipment using integral antennas intended primarily for analogue speech|
|EN 300 341||Land Mobile Service (RP 02); Radio equipment using an integral antenna transmitting signals to initiate a specific response in the receiver|
|EN 300 390||Land Mobile Service; Radio equipment intended for the transmission of data (and speech) and using an integral antenna|
|EN 300 471||Land Mobile Service; Rules for Access and the Sharing of common used channels by equipment complying with EN 300 113|
|EN 301 166||Land mobile service;
Technical characteristics and test conditions for radio equipment for analogue and/or digital communication (speech and/or data) and operating on narrowband channels and having an antenna connector
|TS 102 587||Conformance testing for the Peer-to-Peer Digital Private Mobile Radio|
|TS 102 490||Peer-to-Peer Digital Private Mobile Radio using FDMA with a channel spacing of 6,25 kHz with e.r.p. of up to 500 mW|