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Updating technique for downloading new system identification (SID) list into a handset

  • US 5,761,618 A
  • Filed: 12/22/1994
  • Issued: 06/02/1998
  • Est. Priority Date: 12/22/1994
  • Status: Expired due to Term
First Claim
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1. A system for downloading data to radio telephone subscriber units, said system comprising:

  • (a) control means for updating at least one system identifier list of preferred service providers for use by said radio telephone subscriber units and generating a version number corresponding to the at least one system identifier list;

    (b) means for broadcasting said version number to said radio telephone subscriber units over a radio telephone control frequency;

    (c) means in each of said radio telephone subscriber units for receiving said version number;

    (d) means in each of said radio telephone subscriber units for comparing said received version number to a version number previously stored in each of said radio telephone subscriber units; and

    (e) means in each of said radio telephone subscriber units for initiating and receiving a download of said at least one system identifier list from said broadcast means if said received version number and said previously stored version number fail to match.

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