Method and apparatus for effecting handoff between different...

Details Method and apparatus for effecting handoff between different... Method and apparatus for effecting handoff between different...

2006-03-21

2006-03-21

Phunkulh, Bob A. (Department: 2661)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C455S438000, C455S439000

Reexamination Certificate

active

07016326

ABSTRACT:
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 is described. The method comprises generating at the second cellular communication system an authentication code as the result of applying an algorithm to a private key assigned to the mobile station for the second cellular communications system and a random number generated by the second cellular communications system. An authentication code is also generated at the first cellular communication system as the result of applying an algorithm to the private key and the random number. The authentication code generated at the first cellular communication system is then transmitted to a mobile station in a data packet, and, from there, the authentication code is transmitted to the second cellular communication system. The authentication code generated at the first cellular communications system is then compared with the authentication code generated at the second cellular communications system.

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