Typical RoIP-solutions based on the “Radiokupol” system components
Referred to such solutions is the local and distributed centralized radio control (with connection of one or more base stations providing NON-OVERLAPPING coverage zones).
FR-101 RoIP-protocol (Radio-over-IP) gateways can operate both independently (communication by separate base stations and in the dispatcher mode using dispatcher software and/or KD-02 series consoles. It is worth noting that the independent mode of operation (“point-to-multipoint”) with the number of points up to 10 is not limited by the traditional for modern IP-networks limitation as it is with the multicast mode. This (and also the competitive price) is one of many differences between FR-101 and foreign analogs, e.g. world popular USA-made NXU-2A models (Chinese gateways are not considered here except when used for radio amateur purposes).
Basically, such tasks come forward when it comes to the radio communication zone that is at substantial distance from the control center, or the control center is “cut off” from radio communication zone by natural obstacles or by other technogenic structures, e.g. a high-voltage power transmission line.
Given below are examples of missions when such simplest solutions can be implemented.
Complicated radio coverage
If radio communication with a CONTINUOUS coverage zone has to be organized (and this is a natural wish by most customers), usually use is made of trunking radio communication, or if there is a shortage of frequency resources and/or the number of subscribers is too small, then Simulcast (quasi-synchronous broadcasting) mode of operation on one pair of frequencies is used.
Such solutions imply the availability of vast resources – both that of frequency and financial. Besides, it requires a reference channel (used for communication between base stations) with special requirements.
Recall that the main problem in crossing coverage zones of base station transmitters (an essential condition for ensuring uninterrupted radio communication) is a phenomenon very well known in physics as interference (for specialists we add that we simplify the problem essence intentionally but it is so in the first approximation).
The second problem lies in the selection of the best subscriber signal received by base stations.
Considered below are the typical examples of a solution of such problems based on our FR-104 RoIP (Radio-over-IP) controller, and a Voter server comparing RSSI levels from the system radio receivers and transmitting the best signal to the system transmitters in continuous mode, and for any analog radios.
Note that such a territorial integration of subscribers via several base stations is solved currently only for digital channel subscribers. For analog subscribers, nobody can offer such a solution (digital repeaters that “understand” analog subscriber provide repeating only within one their “own” base station).
Owing to the fact that the “Dispatcher” software is capable of switching controllable radios between themselves, the dispatcher can organized a common radio communication network that will include not only subscribers with radios of different make and standards but also radios belonging to different services. Thus, e.g. it is not a problem whatsoever to connect a MIA radio operating in digital APCO-25 standard with an EMERCOM radio that uses a different digital standard for radio communication, e.g. DMR.
Tasks of such a type arise basically in two cases.
First case - operational communications between subscribers of mixed-vendor networks in the location where some emergency operations are carried out. A typical example is a rescue operation.
Second case – smooth construction/ replacement of one type of base equipment with a different one without a possibility of making a logical interface between them, i.e. at places where routing of only digital radio communication channels and any other types (e.g. IDAS and DMR or SW and dPMR, etc) is required.