Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-04-21
2001-11-20
Jung, Min (Department: 2663)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S466000
Reexamination Certificate
active
06320862
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to a mobile communications system, and in particular to a mobile communications system connected to an integrated services digital network (ISDN) and a call setup method and system from a mobile terminal to the ISDN network.
2. Description of the Related Art
A mobile communications network connected to a fixed communications network has been disclosed in Japanese Patent Unexamined Publication No. 8-70335. A mobile communication switching system of the mobile communications network is provided with a plurality of wireless protocol controllers and a plurality of wired protocol controllers. In the case where a connection is set up between a mobile terminal and a data terminal connected to the fixed communications network, a pair of wireless and wired protocol controllers are selected to allow data communications between the mobile terminal and the data terminal.
Such a data communications system is used to provide a subscriber of the mobile communication system with Group 3 facsimile communication service, V. 42ANNEX modem communication service and high-speed data transmission service. These services are proposed as follows. The Group 3 facsimile communication service uses ARQ (Automatic Repeat Request) procedure for wireless-section protocol and ITU-T Recommendation T.30 and T.4 for wired-section protocol. The V.42ANNEX modem communication service uses FEC (Forward Error Correction) procedure and bit-interleave scheme for wireless-section protocol and ITU-T Recommendation V.42ANNEX for wired-section protocol. The high-speed data transmission service uses ARQ procedure for wireless-section protocol and arbitrary data circuit-terminating equipment (DCE) for wired-section protocol.
When a mobile terminal requests a call setup for data communication, however, some disadvantages are developed. In the case where a new data communication service is provided to the existing mobile communications system, it is necessary to provide all the mobile terminals with a new function of specifying the respective types of wireless and wired data communication protocols and producing a circuit switching signal including them.
Therefore, the user must know the wired data communication protocol used by the data terminal of an opposite party before a mobile terminal requests a call setup for data communication.
Further, the existing mobile communications system is not provided with a means for terminating the wired data communication protocol required to communicate with an ISDN terminal, Therefore, the mobile terminal cannot be connected to the ISDN terminal.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method and system which can provide a data communication service between a mobile terminal and an ISDN terminal without changing the wireless-section data communication protocol.
Another object of the present invention is to provide a method and system which can provide a data communication service depending on the capability of the data terminal of an opposite party.
According to an aspect of the present invention, a mobile communications system includes a first terminator for terminating a first transfer procedure of user information for wireless transmission and a second terminator for terminating a second transfer procedure of a circuit switching signal for wireless transmission. Further, it is provided with a first interface to the ISDN for the user information according to ITU-T Recommendation V.110 and a second interface to the ISDN for the circuit switching signal according to ISDN User Part (ISUP) of common channel signaling system No. 7.
Since the first interface of V.110 can converts data and data rate between the radio transmission and the ISDN, an ISDN connection service can be provided to the mobile communications system.
According to another aspect of the present invention, the mobile communications system is further provided with a third interface to the ISDN for user information according to modem information for an analog public switched network and a selector for selecting one of the first and third interfaces depending on an opposite party data terminal. The second interface may selectively transmit a first setup message and a second setup message to the ISDN depending on the opposite party data terminal. The first setup message may have an information element set to an unlimited bearer service of 64 kbps. The second message may have the information element set to a 3.1 kHz-Audio bearer service of 64 kbps.
Since the selector can select one of the V.110 and the modem information, an ISDN connection service can be provided to the mobile communications system depending on the capability of the data terminal of an opposite party.
REFERENCES:
patent: 5450472 (1995-09-01), Brax
patent: 5600633 (1997-02-01), Jaisingh et al.
patent: 5608780 (1997-03-01), Gerszberg et al.
patent: 5655001 (1997-08-01), Cline et al.
patent: 5771275 (1998-06-01), Brunner et al.
patent: 5917816 (1999-06-01), Jacobsohn
patent: 0 700 225 A2 (1996-06-01), None
patent: 8-70335 (1996-03-01), None
Swedish Office Action dated Nov. 29, 2000, with English translation.
Jung Min
McGinn & Gibb PLLC
NEC Corporation
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