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Mobile telephony system intended for indoor and outdoor subscriber use

  • US 5,235,632 A
  • Filed: 04/04/1991
  • Issued: 08/10/1993
  • Est. Priority Date: 04/10/1990
  • Status: Expired due to Term
First Claim
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1. A mobile telephony system with a plurality of cells intended for indoor and outdoor subscriber use, and comprising an external part-system for outdoor use which includes external base stations of relatively high signal strength and connected directly to a mobile switching centre, and an internal part-system for indoor use and having internal base stations of relatively low signal strength which are connected to the mobile switching centre, whereinthe two part-systems have traffic channels essentially for call transmissions and control channels essentially for assignment and change of the traffic channels;

  • at least one of the traffic channels of the internal part-system has the same frequency as the traffic channels assigned to the base station of the external part-system cell in which the internal part-system is located;

    the inner part-system has adaptive channel assignment;

    an internal identification word which is unique to the internal part-system is transmitted from the internal base stations on the control channels in the internal part-system;

    an outer identification word which is unique to the external part-system is transmitted from the external base stations on the control channels in the external part-system;

    a mobile station detects a signal quality for the control channel of the internal part-system on which the internal identification word is transmitted;

    the mobile station transmits an internal identification signal to the internal base stations when the detected signal quality exceeds a desired quality measurement; and

    wherein the mobile station transmits an external identification signal to the external base stations when the detected signal quality is beneath the desired quality measurement.

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