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Call set-up on 800 MHz analog voice channel from 1900 MHZ digital control channel

  • US 5,878,349 A
  • Filed: 07/16/1996
  • Issued: 03/02/1999
  • Est. Priority Date: 07/16/1996
  • Status: Expired due to Term
First Claim
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1. In a cellular network having a first cluster of base stations serving a first group of mobile stations over digital RF channels and a second cluster of base stations, collocated with said first cluster, for serving a second group of mobile stations over analog RF channel;

  • , wherein some of said base stations in said second cluster have cells which overlap with cells of said first cluster, a method of setting up a call on an analog voice channel of a base station of said second cluster while a mobile station is being served by a digital control channel of a serving base station in said first cluster, comprising the steps of;

    receiving at said serving base station of said first cluster, a mobile station service code indicative of an analog voice channel preference;

    forwarding said mobile station service code to a mobile switching controller;

    instructing said serving base station to set up a call with said mobile station on a digital traffic channel;

    determining if a cell of a base station from said second cluster is overlapping a cell which corresponds to said serving base station;

    if an overlapping cell is available, determining if an analog voice channel is available on said overlapping cell; and

    if an analog voice channel is available, forcing said serving base station and said mobile station to engage in an inter-cell handoff to said analog voice channel on said overlapping cell.

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