Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
1998-01-30
2001-11-20
Trost, William (Department: 2645)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S403000, C455S410000, C455S411000, C455S500000, C455S550100, C455S560000, C379S161000, C379S168000, C379S169000, C379S184000, C379S194000
Reexamination Certificate
active
06321094
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a network system including a mobile communications system, and in particular to an access method which provides a mobile terminal with access to a host computer of the mobile terminal through the mobile communications system.
2. Description of the Related Art
In radio mobile communications, a plurality of data exchanges are needed for connection establishment between a mobile terminal and a connection control station. To achieve rapid connection establishment, there has been proposed a call connection procedure in Japanese Patent Unexamined Publication No. 4-23527. More specifically, when calling, the mobile terminal transmits a calling signal conveying a source ID (identification) number, a destination ID number, and additional information to the connection control station. In the connection control, the following processes are performed concurrently: a subscriber information check using the source ID number, an additional information check, and a connection process of a switching system. Only when all responses to the checks and the connection process are affirmative, the connection between the mobile terminal and the connection control station is established.
An authentication method using secret-key encryption has been proposed in Japanese Patent Unexamined Publication No. 5-183507. An ID center transmits random data as an authentication request signal to a mobile terminal. At the mobile terminal, the received random data and a secret key input by the subscriber are used to produced encrypted data. The encrypted data is transmitted as an authentication response signal to the ID center. At the ID center, the random data and a registered secret key are used to produce encrypted data which is compared with the received encrypted data from the mobile terminal. If the produced encrypted data is coincident with the received one, the authentication check is affirmative.
Similarly, a radio telephone service access method using secret-key encryption has been proposed in Japanese Patent Unexamined Publication No. 4-2333341.
In the case of a host access system in which a mobile terminal obtains access to a host computer through the mobile communication system, however, the conventional technique described above fails to provide both sufficiently rapid connection establishment and sufficient security of private information. In the connection control procedure where a calling signal conveying a source ID number, a destination ID number and additional information is transmitted to the connection control station, after all the necessary check processes have been completed in the mobile communication system, the connection between the mobile terminal and the host computer is established. In other words, the connection cannot be established without completing all the necessary check processes in the mobile communication system.
In the conventional authentication methods using secret-key encryption, a plurality of data exchanges are needed for connection establishment between a mobile terminal and a connection control station. Therefore, it is very difficult to shorten the time required for connection establishment.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method and system which can effectively perform connection establishment at a short time.
Another object of the present invention is to provide a method which can achieve rapid connection establishment with data security.
According to the present invention, when establishing a connection between a wireless mobile terminal and a host computer in a wireless mobile communications system, the wireless mobile terminal produces a connection establishment request signal including first information which is required to obtain services from the host computer and then transmits the connection establishment request signal to the host computer. When receiving the connection establishment request signal from the wireless mobile terminal, the host computer verifies the first information included in the connection establishment request signal received, and transmits a response signal back to the wireless mobile terminal only when the first information has been verified. This causes the connection to be established between the wireless mobile terminal and the host computer.
The wireless mobile terminal may encrypt the first information into encrypted data according to a predetermined encryption scheme and produce the connection establishment request signal which includes the encrypted data in place of the first information. Similarly, the host computer may decrypt the encrypted data included in the connection establishment request signal received into the first information according to the predetermined encryption scheme and verify the first information.
The first information may be encrypted into different encrypted data each time the connection establishment request signal is transmitted.
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English translation of Japanese Office Action dated Apr. 6, 1999 (Hei II).
Hayashi Keiichi
Nagai Hiroto
Ferguson Keith
McGuireWoods LLP
NEC Corporation
Trost William
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