Networked cellular radiotelephone systems
Portable radio telephone system
Selective system scan for multizone radiotelephone subscriber units
Distributed antenna system
Radio channel allocation based on location of mobile users
Method of and apparatus for advanced directed retry Patent #: 5287545
ApplicationNo. 955511 filed on 10/02/1992
US Classes:455/443, Overlapping cells455/434Control or access channel scanning
ExaminersPrimary: Eisenzopf, Reinhard J.
Assistant: Sobutka, Philip J.
Attorney, Agent or Firm
International ClassH04Q 007/00
AbstractA system which improves coverage in overlapping coverage areas between two type-A or type-B cellular radio telephone systems is able to direct a subscriber unit in the overlapping coverage area to the home or primary system, thereby minimizing the subscriber unit's roaming-type expenses. The system includes a control channel receiver, a control unit, and a control channel transmitter/receiver pair, in combination with a transmit/receive antenna. The system transmits a control channel, which is associated with the home system, into the overlapping region. The control channel is intended to be the strongest channel in that region. Any subscriber units in the region associated with the home system which respond to that control channel will be directed to other control channels associated with the home system. Those subscriber units will receive service from the home system, as opposed to the foreign system which may provide other strong control channels in the overlapping coverage area.