| 摘要 |
A dual frequency cellular radiotelephone system, having different service providers, serving mobile subscribers at first and second distinct frequency ranges, uses frequency conversion techniques, to serve both frequency ranges with a minimum of equipment duplication. A first service group is serviced by a first system including a mobile switching center (MSC), a first transmission unit, a first base station controller (BSC), a first base transceiver, a first linear amplifier and first antenna. The entire train of components is designed to support air interface transmissions at the first frequency band at which the first group is served. A signal frequency converter, connected to a transceiver of the first frequency band, converts downlink signals from the first frequency range to the second frequency range and uplink signals from the second frequency range to the first frequency range. Signals transmitted by the second antenna are within the second band of frequencies and signals received at the second band of frequencies are converted to signals within the first band of frequencies so that they may be processed by the first radio telephone system of the first frequency band. Mobile stations are identified by the subscriber group identification register for their subscriber group enabling distinct services and distince system parameters. Information concerning each mobile station of the first and second subscriber groups is obtained from the first and second subscriber information register databases.
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