Telecommunications – Radiotelephone system – Special service
Reexamination Certificate
2001-10-02
2004-07-27
Smith, Creighton (Department: 2645)
Telecommunications
Radiotelephone system
Special service
Reexamination Certificate
active
06768904
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile data communication system including a mobile terminal, and more particularly, to methods for transmitting and receiving data in a data communication system having a mobile station. Using the method according to the present invention, a user can transmit or receive data through a data communication channel by transmitting and receiving a ATD command and a receiving side telephone number without disconnecting the wireless voice communication line connection made earlier.
2. Background of the Related Art
The basic objective of the current research and development of the GSM (Global System for Mobile) digital cellular phones is to provide an outstanding global wireless communication service by building a global GSM network. The service should include not only a voice service, but also a data service, a fax service, a short message service, and many other supplemental services so that a global mobile management service can be provided to enable a user to be connected with others.
For providing a data (fax) service among the services mentioned above, a typical mobile station requires a fax adapter and can support up to a 2.4 kbit/s transmission rate depending on the type of the mobile terminal and the type of the communication service. On the other hand, A PC for a high-speed data service can support up to a 9.6 kbit/s transmission rate.
FIG. 1
illustrates a typical wireless data communication system. The system includes a transmitting/receiving data terminal (i.e., PC)
10
running an application program for a high-speed data service in order to send/receive the data in series; a mobile terminal (MT)
20
performing a data communicating function and modem controlling functions of the communication software and an IWF (Interworking function) by combining a call detecting function and a switching function; a base station (BS)
30
broadcasting the wireless data communication of the mobile terminal
20
; a BSC (Base Station Controller)
40
controlling the base station
30
; a MSC (Mobile Switching Center)
50
determining a communication line depending upon the communication service requested by the mobile terminal
20
; an IWF (Interworking Function)
60
being connected to the MSC
50
and having a modem pooling function for connecting to the internet; a service network (i.e. PSTN: Public Switch Telephone Network)
70
for the data communication; and a receiving/transmitting data terminal
80
.
The data terminal
10
includes a personal computer and a PDA (Personal Digital Assistant) that run the application software for the high-speed data service to transmit/receive data in series to/from the mobile terminal
20
. Additionally, the BSC
40
uses Signaling System No. 7 to establish a data call in response to a call request for the data service and to manage a signal link when performing handover. The MSC
50
handles a mobile call operation, a subscriber information process, a visiting subscriber management, a data call operation with the IWF
60
, and a process for interworking with other networks such as PSTN or PCS. The IWF
60
performs a modem pooling in order to connect to an internet or a data service call.
In order to have a voice conversation using the mobile terminal
20
and to transmit data using the data terminal
10
, an ATD command is inputted. The ATD request signal is transmitted to the BSC
40
and MSC
50
through the base station
30
by the mobile terminal
20
. The MSC
50
initially identifies the data service option; makes a connection request to the data terminal
80
, which is connected to the PSTN
70
, of the receiving subscriber according to the ATD request signal; and reports to the mobile terminal
20
after confirming with MSC
50
if the data terminal
80
accepts the request. Thereafter, the IWF accomplishes the modem communication by negotiating with the receiving subscriber. Therefore, once a data communication channel is accomplished, the data is received or transmitted through a modem assigned to the IWF
60
by the application program.
When the application program requests to terminate the data service according to the line restoration request from the transmitting subscriber, the mobile terminal
20
transmits a modem canceling request signal through the IWF
60
in order to cancel the assigned modem, and it restores the link to the MSC
50
. When the link through a modem is completed, the line between the MSC
50
and the mobile terminal emulator is restored. Then the line between the transmitting subscriber and the MSC
50
is restored according to the call restoring request made by the transmitting subscriber, and the data service gets terminated.
On the other hand, when the data terminal
10
(i.e., facsimile) sends a receiving call request to the BSC
40
, the BSC
40
pages the mobile terminal
20
through a TCP/IP protocol. When the mobile terminal
20
repeatedly transmits the ring signal being indicative of an incoming call in order to convert to a facsimile receiving mode in the application program, the application program of the data terminal
10
that received the call transmits ATA signal, and the mobile terminal
20
sends a reply message after confirming the receipt of the ATA signal. The mobile terminal
20
sends a connection message indicating the fax data receiving condition to the MSC
50
, and it sends a ATD command to the IWF
60
after a predetermined time period in order to achieve a fax data communication. When the mobile terminal
20
receives a call canceling request message upon completion of the data transmission, it sends a modem resetting control signal to the IWF
60
and sends a call release completion message the MSC
50
upon receipt of the reset completion signal. Finally, the communication channel between the mobile terminal
20
and the MSC
50
is released.
According to the typical wireless communication system shown above, the system can be converted to a fax mode by sending a ATD command from the data terminal to the mobile terminal or sending a fax signal after the opposite side mobile terminal converts to a fax mode during the voice communication. Once a fax mode is set, data transmits from the transmitting data terminal
10
to the receiving data terminal
80
through the mobile terminal
20
. On the other hand, the data transmitted from the receiving data terminal are transmitted to the data terminal
10
through the mobile terminal
20
.
However, in a case where the mode switches from a voice communication mode to a fax mode for fax data transmission during voice conversation, the commands that the application program can use are limited to ATD or Remote Initiated commands. In other words, it is quite difficult to switch to another phone number when a connection is once made by the ATD command.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to method for transmitting and receiving data using a mobile terminal that substantially obviates one or more problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide methods for transmitting and receiving data in a data communication system including a mobile terminal, in which the mode of the communication system is converted from a Voice mode to a Data (Fax) mode without disconnecting the voice communication line made earlier by transmitting a ATD command with a receiving side telephone number.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied an
Fleshner & Kim LLP
LG Electronics Inc.
Smith Creighton
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