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System and method for selective restriction of ciphering

  • US 5,781,628 A
  • Filed: 08/19/1997
  • Issued: 07/14/1998
  • Est. Priority Date: 08/19/1997
  • Status: Expired due to Term
First Claim
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1. A telecommunications system having a mobile services center, a base station system attached thereto and a multiplicity of mobile terminals in wireless communication therewith, a plurality of said mobile terminals having ciphering capability therein for wireless ciphered communications with said base station system, circuitry within said telecommunications system for selectively restricting said ciphering capability within a plurality of restricted areas covered by said telecommunications system, said circuitry comprising:

  • a ciphering database containing a multiplicity of ciphering restrictions pertaining to a corresponding multiplicity of signal transceiving areas within said telecommunications system, said plurality of restricted areas being a corresponding plurality of said signal transceiving areas, a ciphering capability flag within said ciphering database being set to no ciphering for each of said restricted areas; and

    geographical referencing means for determining said ciphering capability of a particular signal reception area within said telecommunications system, said means accessing a particular ciphering capability flag within said ciphering database, said particular flag corresponding to said particular signal transceiving area, whereby said telecommunications system restricts the ciphering capability of a user within said particular signal transceiving area pursuant to said corresponding particular flag.

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