Public Mobile Radio Trunking Service (PMRTS) is a two-way mobile radio service in which users communicate amongst themselves in a designated group, talk through a pair of radio frequencies which get assigned out of a common pool of frequencies in a designated frequency band.

PMRTS is a well-proven niche market service having its unique capability of communication instantly within the closed user group (CUG). The service has found its growing prominence in all critical infrastructure sectors such as Manufacturing, Oil & Gas, Mining, Construction, Courier, Emergency Medical Services, Utilities, Transportation (Road, Airports, Harbours), Energy & Communication, Fire & Safety department of public utilities. The market for the trunking services is growing slowly but steadily in the country and has been particularly driven by the development and deployment of infrastructure such as sea ports, airports, metro rail projects, industrial plants, hubs, etc.


PMRTS (Public Mobile Radio Trucking System)

        1. Application in prescribed Performa duly filled and signed by authorized signatory.
        2. Copy of Service LicenseAgreement with licensor i.e. DoT.
        1. Copy of initial/earlier earmarking of spectrum, in particular, city service area.
        2. The request of additionalspectrum{Channel) with justification is to be made to CS- Cell of DoT.
        3. Requests will be considered only if recommended by cs Cell.
        1. Deployment plan in prescribed proforma with SACFA acceptance ID No. to be applied online along with hardcopy and softcopy for acceptance.
        1. Copy of frequency earmarking.
        2. Covering letter should clearly indicate the online ID No.s of the deployment plans for which WOL is sought(For digital technology only).
        3. Copy of equipment commercial invoice.
        4. Royalty and License Fee payment receipt for the current year.
        5. Subscriber loading status as on the 1st of January & July every year by means of the affidavit to be submitted.



Application Form


Setup Diagram


Equipment Specification


Test set-up for public access testbeds


Requisite Fee


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    In essence, a trunked radio system is a packet switching computer network. Users’ radios send data packets to a computer, operating on a dedicated frequency — called a control channel — to request communication on a specific talk-group. The controller sends a digital signal to all radios monitoring that talk group, instructing the radios to automatically switch to the frequency indicated by the system to monitor the transmission. After the user is done speaking, the users’ radios return to monitoring the control channel for additional transmissions.

    This arrangement allows multiple groups of users to share a small set of actual radio frequencies without hearing each other’s conversations. Trunked systems primarily conserve limited radio frequencies and also provide other advanced features to users.

    A talkgroup is an assigned group on a trunked radio system. Unlike a conventional radio which assigns users a certain frequency, a trunk system takes a number of frequencies allocated to the system. Then the control channel coordinates the system so talkgroups can share these frequencies seamlessly. The purpose is to dramatically increase bandwidth. Many radios today treat talkgroups as if they were frequencies, since they behave like such. For example, on a radio scanner it is very common to be able to assign talkgroups into banks or lock them out, exactly like that of conventional frequencies.

    In some agencies, groups are assigned to a fleet map. This was implemented to make it easier to assign group ID numbers. For example, EMS would be on a separate ‘fleet’ than the police. In those fleets are sub fleets or the actual talk groups. This system is not as common as the typical trunking method, but it does exist. In some communities, the ID corresponds to a location or agency. For example, it is common to see a ‘1’ or ‘2’ in front of a police group and another number in front of a fire group.

    Most scanners that can listen to trunked radio systems (called trunk tracking) are able to scan and store individual talk groups just as if they were frequencies. The difference, in this case, is that the groups are assigned to a certain bank in which the trunked system is programmed. In other words, the talk group is stored on the trunked bank.