Telecommunications – Radiotelephone system – Security or fraud prevention
Patent
1996-02-09
1999-08-24
Urban, Edward F.
Telecommunications
Radiotelephone system
Security or fraud prevention
455551, 455575, H04B 138
Patent
active
059436140
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a mobile radio communication device such as a car telephone device, portable telephone and cordless telephone, and more particularly to a mobile radio communication device used in a mobile radio communication system having a authentication procedure in the procedure for connecting a base station and a mobile station to each other via a radio channel.
BACKGROUND ART
Recently, various types of mobile radio communication systems have been developed and put into practical use with the development of the radio communication technique and an increase in the communication need, and a cellular radio communication system is provided as one example. FIG. 1 shows the schematic construction of the system. For example, the system includes a control station CS connected to a wire communication network NW via a circuit line CL.sub.0, a plurality of base stations BS.sub.1, BS.sub.2, BS.sub.3, . . . connected to the control station CS via respective circuit lines CL.sub.1 to CL.sub.n, and a plurality of mobile stations or units MU.sub.1, MU.sub.2, MU.sub.3, MU.sub.4, . . . . The base stations BS.sub.1, BS.sub.2, BS.sub.3 . . . respectively provide radio zones E.sub.1, E.sub.2, E.sub.3 . . . which are called cells for respective small different areas in the service area. Each of the mobile stations MU.sub.1, MU.sub.2, MU.sub.3, MU.sub.4, . . . is connected to the base station of the cell in which the mobile station lies via a corresponding radio channel and each of the mobile stations is connected to the wire communication network NW from the corresponding base station via the control station CS.
Recently, in the above system, an authentication procedure for the mobile station has been provided in the procedure for radio connection between the mobile station and the base station at the time of call originating, call incoming or registration of position. FIGS. 2 and 3 show an example of a sequence of originating call control procedures containing the authentication procedure.
Assume now that the user has effected the originating call operation in the mobile station as shown in FIG. 2. The mobile station generates an originating call signal containing a telephone number MIN (Mobile Identification Number) as a preset identification number of the mobile station and an authentication parameter corresponding to the MIN and transmits the originating call signal to the base station. For example, a count value indicating the number of communications using the MIN is used as the authentication parameter. The count value is counted up in the mobile station and base station each time the communication using the MIN is effected. Therefore, the count value of the mobile station and the count value of the base station for the same MIN are always equal to each other.
When the base station receives an originating call signal from the mobile station, it extracts the count value and MIN contained in the originating call signal and transfers a count value corresponding to the MIN held in the base station together with the extracted MIN and count value to the authentication management center. For example, the authentication management center is located in a control station of higher rank than the control station CS or a control station provided for a plurality of carriers.
The authentication management center first determines whether the received MIN is registered or not, and if the MIN is registered, it collates the count value with a count value for the same MIN counted in the base station. Then, if the collated count values are coincident with each other, it transmits a notice of authentication to the base station. When the base station receives the notice of authentication, it generates a channel specifying message and transmits the same to the mobile station and then seizes and registers a radio channel. When the mobile station receives the channel specifying message, it seizes a radio channel according to the channel specifying message. Thus, the radio link is created by the radio chann
REFERENCES:
patent: 5241598 (1993-08-01), Raith
patent: 5557676 (1996-09-01), Naslund et al.
patent: 5615267 (1997-03-01), Lin et al.
patent: 5625869 (1997-04-01), Nagamatsu et al.
Obayashi Arata
Sakagawa Takashi
Kabushiki Kaisha Toshiba
Urban Edward F.
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