×

Method and apparatus for effecting handoff between different cellular communications systems

  • US 6,594,489 B2
  • Filed: 02/14/2002
  • Issued: 07/15/2003
  • Est. Priority Date: 12/07/2001
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of effecting handoff of a mobile station from a first base station in a first cellular communications system controlled by a first mobile switching control station to a second base station in a second, different cellular system controlled by a second mobile switching control station, the method comprising:

  • generating for the mobile station a cipher key for use by the mobile station during communication in the second cellular communications system, the cipher key being generated by the mobile station from a private key assigned to the mobile station for the second cellular communications system and from a random number generated by the second cellular communications system;

    communicating the cipher key to the first mobile system; and

    generating for the mobile station a private long code for use by the mobile station during communication in the first cellular communications system.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×