Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-12-04
2001-10-30
Kincaid, Lester G. (Department: 2682)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S560000, C455S445000
Reexamination Certificate
active
06311061
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile data-communication system.
This application is based on patent application No. Hei 9-335556 filed in Japan, the contents of which are incorporated herein by reference.
2. Description of the Related Art
Conventional mobile data-communication systems are based on a one-to-one system. An example of the conventional system is disclosed in “PERSONAL DIGITAL CELLULAR TELECOMMUNICATION SYSTEM”, the Standards of the ARIB (Association of Radio Industries and Businesses), RCR STD-27F, the third volume, appendix 3-18, April, 1991 (first standardization) to February, 1997 (revision).
The following are problems generated by the above conventional mobile data-communication system:
The first problem is that data communication in connection with multiple lines is impossible. The reason is that only one-to-one data communication is regulated in the system.
The second problem is that when line quality is inferior, real-time data transmission is impossible. The reason is that even with lines having inferior qualities, all data are always transmitted in the regulated system.
SUMMARY OF THE INVENTION
In consideration of the above circumstances, an objective of the present invention is to provide a multi-connector used for the mobile data-communication system, which enables multi-connection of data terminals.
Another objective of the present invention is to provide a multi-connector for a mobile data-communication system, a mobile data-communication system itself, and a multi-connecting method by which even when data are concentrated in a single line or even with a wireless line of inferior quality, real-time data communication is possible.
Therefore, the present invention provides a multi-connector for a mobile data-communication system, which is connected with a mobile communication exchange in the system, wherein the multi-connector is activated according to a multi-connection request which is sent from a mobile or fixed station to the mobile communication exchange, and the multi-connector controls data communication based on a predetermined transmission control proceeding and distributes data in accordance with the designation with respect to an addressee for each item of data.
Typically, the multi-connector comprises:
a wireless-line terminator for establishing an error-control protocol with respect to a connection adapter which is provided in the mobile station so as to connect a mobile device with a data terminal and which controls data communication via a mobile network, and the wireless-line terminator for correcting erroneous data and performing compressing and expanding operations;
a wire-line terminator for establishing an error-control protocol with respect to a data line terminator which is provided in the fixed station and which controls data communication via a public network, and the wireless-line terminator for performing compressing and expanding operations; and
an integrating section for collecting data received from the wireless-line terminator and the wire-line terminator, and sending each item of data to the designated addressee.
Accordingly, each addressee can be designated using an application program used in a data terminal or using the connection adapter, and the multi-connector can identify the designated addressee, and then relevant data is sent. If plural addressees are designated, the relevant data can be sent to each addressee by duplicating the data. Therefore, data terminals which are presently connected in the system are managed and each item of data is sent according to designation of an addressee; thus, multi-connection can be realized even in the mobile data communication.
When an amount of stored data to be sent from the wireless-line terminator to the connection adapter, or an amount of stored data to be sent from the wire-line terminator to the data line terminator is large, the relevant data may be thinned out as much as possible and then sent.
The multi-connector may further comprise an external-device interface for connecting an external device so that the external device sends and receives data to and from the integrating section.
When an amount of stored data to be sent from the external-device interface to the external device, the relevant data may be thinned out as much as possible and then sent.
The above thinning of data is generally performed based on the consideration that data which were sent via multiple lines may be concentrated in a single line. In particular, in a wireless-communication area, even if no data concentration is generated, line quality is inferior and communication speed may be lowered. At the time of sending data, the wireless-line terminator thins out data as much as possible, according to the mount of stored data, thereby realizing real-time communication even in an undesirable transmission situation. The data which can be thinned out may be designated by the sending side, and each item of data may have a priority level. For example, if data belonging to a single line is omitted in facsimile transmission, or if a frame in moving pictures is lost, no problem occurs in practice. In addition, if the data of moving pictures are concentrated in a single line, data of lower priority can be thinned out such that, for example, only voice data are transmitted without transmitting picture data.
The wireless-line terminator and the wire-line terminator may be provided outside the multi-connector. In this case, any number of terminators can easily be provided outside the multi-connector and the number of presently-provided terminators corresponds to the number of possible terminals to be connected. Therefore, it is easy to change the maximum number of terminals which can be connected with the multi-connector.
The present invention also provides a mobile data-communication system comprising:
a plurality of mobile stations, each comprising:
a mobile device for performing control with respect to a wireless line for mobile communication;
a data terminal for performing data communication via a mobile network; and
a connection adapter for connecting the mobile device and the data terminal, and for controlling data communication via the mobile network;
a fixed station comprising:
a data terminal for performing data communication via a public network; and
a data line terminator for controlling data communication via the public network;
a plurality of wireless base stations for controlling wireless lines for mobile communication;
a mobile communication controller for controlling the wireless base stations;
a mobile communication exchange, which covers the mobile stations via the mobile communication controller and the wireless base stations, for performing operations of exchanging and connecting mobile communication calls with respect to the mobile stations, and the mobile communication exchange, which also covers the fixed station, for performing operations of exchanging and connecting communication calls with respect to the fixed station; and
a multi-connector, connected with the mobile communication exchange and activated according to a multi-connection request which is sent from a mobile or fixed station to the mobile communication exchange, for controlling data communication based on a predetermined transmission control proceeding and distributing data in accordance with designation with respect to an addressee for each item of data.
Typically, the multi-connector comprises the above-mentioned wireless-line terminator, wire-line terminator, and integrating section.
The present invention further provides a mobile data-communication method to be used in the above mobile data-communication system, wherein:
the mobile communication exchange activates the wireless-line terminator or the wire-line terminator according to a multi-connection request which is sent from the mobile or fixed station and connects the multi-connector with the mobile or fixed station;
when the multi-connector is activated by the mobile communication exchange, the multi-connector
Foley & Lardner
Kincaid Lester G.
NEC Corporation
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