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Mode switching method for mobile station

  • US 5,950,127 A
  • Filed: 08/15/1996
  • Issued: 09/07/1999
  • Est. Priority Date: 08/18/1995
  • Status: Expired due to Term
First Claim
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1. A mode switching method for a mobile station which communicates by switching between a first communication mode connected to a first mobile communication system and a second communication mode connected to a second mobile communication system, wherein a portion of the service area of said first mobile communication system and the service area of said second mobile communication system overlap, the method comprising the steps of:

  • transmitting a threshold information including at least a field strength threshold and time information indicating time to said mobile station for switching the mode from a base station of at least one of said first mobile communication system and said second mobile communication system;

    storing said threshold information in said mobile station;

    producing an assessment information based on a received signal in said mobile station;

    comparing said assessment information with said threshold information in said mobile station;

    switching said first communication mode and said second communication mode based on said threshold information received in said mobile station;

    detecting in said mobile station a received field strength;

    comparing the received field strength with said field strength threshold;

    switching said first communication mode and said second communication mode on the basis of the compared result,switching the communication mode when conditions for mode switching are maintained during a predetermined time beginning from when the conditions for mode switching come into existence; and

    setting said predetermined time on the basis of said time information.

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