Apparatus and method of using a ciphering key in a hybrid...

Details Apparatus and method of using a ciphering key in a hybrid... Apparatus and method of using a ciphering key in a hybrid...

2006-05-30

2006-05-30

Perez-Gutierrez, Rafael (Department: 2687)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S410000, C455S436000, C370S313000

Reexamination Certificate

active

07054628

ABSTRACT:
A method of using a ciphering key in a mobile station (18) from a first base station (12) in a first cellular communications system controlled by a first mobile switching control (10) station to a second base station in a second, different cellular system controlled by a second mobile switching control station is described. The method comprises 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 is 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. The cipher key is then communicated to the first mobile system and a private long code is generated for use by the mobile station during communication in the first cellular communications system.

REFERENCES:
patent: 5778075 (1998-07-01), Haartsen
patent: 6594489 (2003-07-01), Holcman
patent: 2002/0091933 (2002-07-01), Quick
patent: 2002/0146127 (2002-10-01), Wong

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