Pulse or digital communications – Transceivers
Reexamination Certificate
1999-02-17
2002-11-26
Pham, Chi (Department: 2631)
Pulse or digital communications
Transceivers
C375S220000, C379S093090
Reexamination Certificate
active
06487239
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method and an apparatus for message communication between telecommunications terminals connected to an integrated services digital network, and more particularly to a method and an apparatus for message communication capable of highspeed, high quality message communication during a call.
BACKGROUND ART
Recently, a method and an apparatus for message communication, which, in addition to ordinary calls, is capable of communicating messages between wired telecommunications terminals wire-connected to an ISDN (integrated service digital network), or between wireless telecommunications terminals, for example, PHS (Personal Handyphone System) and other portable telecommunications terminals, wirelessly-connected via a radio base station to an integrated service digital network, has been proposed.
This type of message communication method and apparatus is constituted so that predetermined message information prepared in advance, or message information inputted using a keypad is transmitted from a message transmitting terminal to a message receiving terminal, and the message receiving terminal displays this received message information on a display or the like.
Incidentally, as this type of message communication method and apparatus,
1) a system, which utilizes DTMF (dual tone multi-frequency) signals; and
2) a system, which at call setting utilizes a subaddress contained in call setting information, have been proposed.
Here, because 1), the system that utilizes DTMF signals, can be used even between telecommunications terminals that are in the midst of a call, the degree of freedom of message communication increases. However, since the message communication thereof not only requires time, but also suffers from numerous line quality-caused transmission errors, if, for example, the telecommunications terminal is a PHS or other wireless terminal, this system is unsuitable for transmitting data that must be accurate, such as telephone directory information.
Further, since 1), the system that uses a subaddress contained in call setting information at call setting, is capable of transmitting messages at highspeed, and line quality-caused transmission errors are few, even when the telecommunications terminal is a PHS or other wireless terminal, accurate, highspeed message transmission is possible. However, the problem is that because call setting information comprise signals that are sent from a call-originating terminal to a call-terminating terminal only at call setting, this system cannot be used during a call, for example, when one wants to send data to the called party while a call is in progress.
Thus, a system that performs message communication using conventional DTMF signals is advantageous in that it can be used even between telecommunications terminals that are in the midst of a call, but because the transmission rate is slow, and there are numerous line quality-caused transmission errors, this system is not suitable for transmitting accurate message information using, for example, a PHS or other wireless terminal. Further, because a system that uses a subaddress contained in call setting information at call setting is capable of transmitting messages at highspeed, and generates few line quality-caused transmission errors, message transmission can be performed accurately and at highspeed between PHS or other wireless terminals, but the problem is that since call setting information comprise signals that are sent from a call-originating terminal to a call-terminating terminal only at call setting, this system cannot be used during a call, for example, when one wants to send data to the called party while a call is in progress.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a method and an apparatus for message communication, which is capable of performing message communication accurately and at highspeed during a call.
To achieve the above-mentioned object, the invention of claim 1 is a method for message communication, which comprises a first telecommunications terminal and a second telecommunications terminal connected to the first telecommunications terminal via an integrated services digital network, and which communicates a predetermined message between the first telecommunications terminal and the second telecommunications terminal, characterized in that the method comprises the steps of:
disconnecting once a call between the first telecommunications terminal and the second telecommunications terminal when the call is in progress between the first telecommunications terminal and the second telecommunications terminal via the integrated service digital network;
performing a message transmission thereafter by attaching a desired message to call setting information and originating a call from the first telecommunications terminal or the second telecommunications terminal, which becomes a message transmitting terminal; and
performing a message reception by the first telecommunications terminal or the second telecommunications terminal, which becomes a message receiving terminal, by receiving the desired message attached to the call setting information.
Further, the invention of claim 2 is characterized in that, in the invention of claim 1, the desired message is set in a subaddress of the call setting information.
Further, the invention of claim 3 is characterized in that, in the invention of claim 1, the first telecommunications terminal and the second telecommunications terminal are wired telecommunications terminals wire-connected to the integrated services digital network.
Further, the invention of claim 4 is characterized in that, in the invention of claim 1, the first telecommunications terminal and the second telecommunications terminal are wireless telecommunications terminals wirelessly-connected to a base station which is wire-connected to the integrated services digital network.
Further, the invention of claim 5 is characterized in that, in the invention of claim 1, at least one of the first telecommunications terminal and the second telecommunications terminal is a wireless telecommunications terminal wirelessly-connected to a base station which is wire-connected to the integrated services digital network.
Further, the invention of claim 6 is characterized in that, in the invention of claim 1, the call disconnection is performed correspondent to both a message transmitting operation at the message transmitting terminal and a message receiving operation at the message receiving terminal.
Further, the invention of claim 7 is characterized in that, in the invention of claim 1, the call disconnection is performed by transmitting a call disconnect signal to the message transmitting terminal from the message receiving terminal correspondent to a message receiving operation of the message receiving terminal and by responding to the receipt of the call disconnect signal at the message transmitting terminal.
Further, the invention of claim 8 is characterized in that, in the invention of claim 1, the call disconnection is performed by transmitting a call disconnect signal to the message receiving terminal from the message transmitting terminal correspondent to a message transmitting operation of the message transmitting terminal and by responding to the receipt of the call disconnect signal at the message receiving terminal.
Further, the invention of claim 9 is characterized in that, in the invention of claim 1, the call disconnection is performed by transmitting message mode alert information to the message receiving terminal from the message transmitting terminal correspondent to a message transmitting operation of the message transmitting terminal, by transmitting a call disconnect signal to the message transmitting terminal from the message receiving terminal correspondent to a message receiving operation based on reception of the message mode alert information at the message receiving terminal and by responding to the receipt of the call disconnect signal at the message transmitt
Goto Hiroyuki
Michinaka Masato
Shimizu Hirofumi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Kabushiki Kaisha Toshiba
Pham Chi
Tran Khanh Cong
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