Patent ID: 6804506
Filing Date: 2004-10-12
Classification: H04L,H04W

Abstract:
A method for controlling security-related functions for call handling in a radio communications system having an air interface for linking a mobile station to a communications network, comprising the steps of:initiating a call set-up by said mobile station; checking access authorization of a radio subscriber to said communications network in a subscriber authentication process carried out between said mobile station and said communication network; sending a ciphering request for secrecy of information on said air interface of said communications network to said mobile station, said ciphering request having an identifier to determine whether said communications network accepts connections on said air interface with ciphered information or with unciphered information; evaluating said sent ciphering request which was received by said mobile station, said mobile station being switchable under subscriber control to an operating mode in which a connection is terminated if said received ciphering request identifier allows connections with unciphered information; sending a message to clear said connection by said mobile station via said air interface to said communications network; and switching said mobile station under subscriber control to said operating mode utilizing input operations via a station key.