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Mobile communication system having a control station which selects speech coding schemes for a mobile station

  • US 5,991,642 A
  • Filed: 09/10/1996
  • Issued: 11/23/1999
  • Est. Priority Date: 01/10/1995
  • Status: Expired due to Term
First Claim
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1. Mobile communication system comprising:

  • a plurality of mobile stations, at least two of said plurality of mobile stations being connectable to each other;

    at least one switch which switches and connects transmission routes between two of said plurality of mobile stations respectively connected to two of said plurality of base stations; and

    control stations which set and control the connection conditions of the base stations;

    wherein at least one of said plurality of mobile stations can handle a single type of speech coding scheme, and at least one of said plurality of mobile stations can adaptively handle two or more different types of speech coding schemes;

    the control stations include;

    a table which temporarily stores, during the time interval from connection until release, conditions relating to the speech coding schemes of two connected mobile stations;

    a means which independently selects the type of speech coding scheme on the basis of the content stored in said table without inquiry to or response from said at least one switch; and

    a means which, when at least one of the two mobile stations has been connected to another base station, transfers the connection conditions to the control station pertaining to the other base station.

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