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Systems and methods for handling emergency calls in hierarchical cell structures

  • US 6,115,596 A
  • Filed: 04/22/1997
  • Issued: 09/05/2000
  • Est. Priority Date: 04/22/1997
  • Status: Expired due to Term
First Claim
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1. A method for transmitting emergency calls in a radiocommunication system comprising the steps of:

  • receiving, over an air interface, at least one emergency call number;

    detecting input of a key sequence from a keypad of a remote station;

    identifying, in said remote station, a call as an emergency call by comparing said input key sequence to determine if said input key sequence matches said at least one emergency call numbers;

    determining if a current control channel to which said remote station is listening has been designated for emergency call transmissions;

    if so, transmitting said emergency call using said current control channel; and

    otherwise, switching to another control channel which has been designated for emergency call transmissions and transmitting said emergency call.

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