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“Radiokupol” in the “Monarch” business center

Improving reliability of radio communication in the largest business center

Site information

“Monarch” multi-functional business and sports/recreation center is a unique object on the map of Moscow. The monumental complex comprising three buildings, the highest of which is a 37-floor delight structure, and the view down on the city from its upper floors is fascinating.

The complex is located in the Moscow’s north-west district, on one of the city’s highways close to the Third Transport Ring junction, at the address: 3, Leningradsky avenue.
Located close to the complex is the Sheremetjevo airport remote terminal where passengers can check-in for their flight.

Mission

Provision of radio communication for security and engineering staff of the business center. Provision of personnel centralized management by shift engineer and security officer. Provision of services interaction in emergency situations. Of special attention is the complex underground section accommodating a number of technical and service rooms, and a 3-level underground parking.

Solution

Radio communication on a complex site is organized using repeaters. But a subscriber located in the first repeater zone can not communicate with a subscriber located in the second repeater zone. To merge coverage zones of different repeaters into a common coverage zone, use is made of RoIP-controllers of our own production. In this case, signal received by one repeater is transmitted over the IP-network to the rest of repeaters and to reach the destination at any point of the site. But there can be areas from which subscriber radios can not establish communication with the nearest repeater due to various reasons (e.g. low transmission power). To ensure coverage for such zones, “receive points” (remote access stations) are installed, the “point” being connected to the system via RoIP-controllers. All date transmitted over the IP-network are processed at the voting server. Thus, full radio coverage is provided on a complex site.


Diagram 1 shows equipment to provide radio coverage on a structurally complex site where some “dead zones” are present.

Using “Dispatcher” software enables voice calls by subscriber located within the radio coverage zone.

The equipment list includes a Voice Logging Recorder to ensure recording of all talks with the detailed information on the message length, time, and the time when subscriber goes on the air.

Due to structurally complex site and high level of radio interferences, use has been made of creating radio coverage featuring transmitter overlapped coverage zones. This means that for one group of subscribers (one communication channel) use is made of several transmit frequencies, whereas receive frequency is common. Subscriber radios are tuned so as to receive the repeater that territorially is closer or its on-air signal is better. Subscriber radios scan repeater transmit frequencies.