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Cellular radio network divided into a primary network covering a selected operating area and at least one subsystem covering possibly overlapping area, with possibility of handoff and registration between primary network and subsystem

  • US 5,915,219 A
  • Filed: 04/10/1996
  • Issued: 06/22/1999
  • Est. Priority Date: 09/10/1992
  • Status: Expired due to Term
First Claim
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1. A cellular radio system comprising:

  • a primary cellular radio network having a plurality of cells including a serving cell broadcasting information as to which ones of said cells are their respective neighboring cells;

    a plurality of mobile cellular radio stations located in geographical areas corresponding to locations of said cells and which are each capable of monitoring radio coverage of respective neighboring ones of said cells and according to said neighboring cell information broadcast by a serving cell for at least one of reregistration and handover decisions;

    at least one separate cellular subsystem comprising at least one cell configured in such a way that each cell belonging to said subsystem is not presented in said neighboring cell information as broadcast by cells of said primary cellular radio network not belonging to said subsystem;

    said at least one subsystem utilizing control channel frequencies which are different from those of said primary cellular network;

    select ones of said mobile stations comprising means for storing in a memory, information as to control channel frequencies of said at least one subsystem, and for reading that information from said memory;

    only said select ones of said mobile stations being arranged to monitor, in addition to control channel frequencies of respective neighboring cells presented in said broadcast by said serving cell, said control channel frequencies of said at least one subsystem according to said information stored in said memory; and

    only said select ones of said mobile stations being arranged to consider a cell of said at least one subsystem offering sufficient radio coverage as being a target cell potentially effectively equivalent to the respective said neighboring cells in the primary cellular network in at least one of reregistration and handover decisions.

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