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Method for preventing a dropped call during a handoff in a radiotelephone system

  • US 5,590,177 A
  • Filed: 09/30/1994
  • Issued: 12/31/1996
  • Est. Priority Date: 09/30/1994
  • Status: Expired due to Fees
First Claim
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1. In a cellular radiotelephone communication system including at least one switch controller, a plurality of base stations including first and second base stations, and at least one mobile station, wherein a switch controller is coupled to the first and second base stations to provide radiotelephone communication throughout first and second coverage areas, respectively, wherein a mobile station is in an active call in the first coverage area with the first base station on a first traffic channel and substantially shadowed from transmissions from the second base station in the second coverage area, a method, performed by the mobile station, for preventing the active call from being dropped when the mobile station suddenly transitions from the first coverage area to the second coverage area, the method comprising the steps of:

  • determining that the active call is in danger of being dropped responsive to the mobile station suddenly transitioning from the first coverage area to the second coverage area;

    notifying the first base station that the active call is in danger of being dropped responsive to the step of determining that the active call is in danger of being dropped;

    determining that the active call with the first base station is in the process of being dropped responsive to the step of notifying the first base station that the active call is in danger of being dropped; and

    establishing the active call with the second base station in the second coverage area before the active call with the first base station is dropped responsive to the step of determining that the active call with the first base station is in the process of being dropped.

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