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Virtual Base Station

The system is designed to provide GSM 900 mobile network coverage (supports HSCSD, GPRS, EDGE) for remote territories, automobile roads, or railways where the installation of common GSM base stations is not feasible due to small mobile traffic.

The system comprises capacity transfer radios (CTR) which retransmit the radio signal sequentially from a base station to users' mobile terminals, and provide network coverage over a territory.

The system is connected to the equipment of a common GSM-site (compatible with the equipment of any vendor), and retransmits and distrubutes up to 6 GSM carriers of a base station (from 1 to 3 hops without radio relay systems) over a target territory.

System benefits

  1. Significant reduction of CAPEX and OPEX costs (comparing to a traditional method of GSM coverage) calculated for a specific territory.
  2. Reduction of power cost of a site from 1.5—2 kW (for a traditional equipment) to 0.36 kW with the same coverage area and network capacity.
  3. Increase the length of a GSM connection zone of one base station equipped with the system by 4—6 times.
  4. Reduction of costs of mobile operators due to simultaneous operation of the system by 2 operators (RAN-sharing) without loss in quality of services and network coverage over a target territory.

Virtual Base Station — Capacity Transfer Technology

Capacity Transfer Technology

  • Converter (CVR) converts GSM 900 carriers to retransmission bandwidth
  • Radio (CTR) is the unit with double-side duplex retransmission, 2 TRX GSM 900

Converter is to be mounted at the site of a base station. The unit converts carrier frequencies of BTS (up to 6 carriers) to retransmission bandwidth, and then transmits them to a remote area.

Radio (CTR) at the remote area receives, amplifies, and retransmits the signal, and also converts the two signals to GSM bandwidth providing further coverage of 2 sectors similar to a base station (1 GSM carrier in each sector).

Specification

ParameterValue
Operating frequency
— GSM channel 880—915/925—960 MHz
— retransmission channel 5925—6425 MHz (other frequencies available upon customer request)
TRX output power
— GSM channel 0.5—20 W (programmable, remote access)
— retransmission channel 0.5 W
Power consumption (at output power of 10 W) up to 360 W (CTR1), up to 250 W (CTR2),  up to 100 W (CVR)
Number of transmitted GSM carriers up to 6
Number of hops up to 3
Operating temperature minus 40…+55 °С (minus 40…122 °F)
Protection class IP67
Power supply AC  220/110 V (CTR1, CTR2), DC  -48 V (CVR)
Overall dimensions (with built-in PSU) CTR — 520х400х260 mm (20.47x15.75x10.24 inch), CVR — 320х400х260 mm (12.59x15.75x10.24 inch)
Weight
— CTR1 47 kg (103.6 lbs)
— CTR2 42 kg (92.6 lbs)
— CVR 35 kg (77.2 lbs)

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