Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Patent
1996-04-26
1999-10-26
Jung, Min
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
370381, 370462, H04J 317
Patent
active
059740442
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a communication switching system and a communication switching method for regulating or controlling a simultaneous communication when communications by multiple communication methods are competed with each other.
BACKGROUND ART
Heretofore, a communication method available in a mobile communication is limited to a voice communication method. In such a voice communication method, there are provided line memory in a data base for controlling users' location information, so that a simultaneous communication (competition) can be regulated depending on "idle" or "busy" which the line memory indicates. In case the line memory indicates "idle", the receiver side is in a non-use state and therefore a communication is allowed. However, in case the line memory indicates "busy", the receiver side is in a used-state, therefore a communication is not allowed and busy tone is sent to the transmitter side, informing that the line is busy.
Incidentally, there is an increasing need for data communication as the recent information-oriented society develops. Specifically, there is a requirement for employing a packet communication as one method of data communication in the mobile communication.
However, it is only a simultaneous communication between voice communications which has heretofore been regulated. Accordingly, it was impossible to regulate a simultaneous communication between a voice communication and a packet communication. Also, it was impossible for the communication switching system to inform, through a communication method by which another communication is undergoing, the transmitter side about a fact that the incoming communication is regulated.
DISCLOSURE OF INVENTION
This invention has been accomplished in view of the above-mentioned situation. It is, therefore, a main object of the present invention to perform a correct processing by regulating or controlling a simultaneous communication between different communication methods such a simultaneous communication between a packet communication and a voice communication and to notify, where it is the case, the transmitter side about a fact that an incoming communication is regulated, through a communication method which is currently busy with another communication.
In order to achieve the above object, according to the invention as defined in claim 1, there is provided a communication switching system for controlling communications that are performed through multiple communication methods by connecting and switching communication circuits between individual communication terminals, comprising a data base for managing a line memory indicating a communication state of the communication terminal for every one of the communication methods; read means for reading a line memory relevant to one communication terminal from the data base when a communication request is made with respect to the one communication terminal from other communication terminal through one communication method; and judgment means for checking whether or not the one communication terminal is currently busy in accordance with the line memory relevant to the one communication terminal and if busy, by what communication method and judging whether or not the communication request should be allowed.
Further, according to the invention as defined in claim 2, the communication switching system further comprises circuit connection means for connecting a communication circuit between the one and other communication terminals when the judgment result is affirmative; and announcement information transmission means for transmitting an announcement information to the other communication terminal when the judgement result is negative, informing that the one communication terminal is currently busy.
Further, according to the invention as defined in claim 3, the announcement information is transmitted by the one communication method through which the communication request was made.
Further, according to the invention as defined in claim 4, there is provided a com
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Ikeda Kimio
Maebara Akihiro
Miyazaki Akitoshi
Okajima Ichiro
Sasada Koji
Jung Min
Mobile Communications Network Inc.
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