Electrical computers and digital processing systems: multicomput – Distributed data processing
Reexamination Certificate
1999-01-15
2002-09-24
Barot, Bharat (Department: 2154)
Electrical computers and digital processing systems: multicomput
Distributed data processing
C709S203000, C709S217000, C709S227000, C709S229000, C713S152000
Reexamination Certificate
active
06457040
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a distributed network computing system, more particularly to a distributed network computing system, wherein a plurality of different kinds of communication networks such as a public communication network, wired LAN (Local Area Network), wireless LAN, etc. are involved together, and wherein application services of various kinds of application software are supplied to the various kinds of terminals connected to these networks such as personal computers(PC), portable PC, which are different in processing capacities, to data exchange apparatus used for the system and to the data exchange method used for the system and the memory media, in which the method is stored and which can be read out by a computer.
In the conventional data processing by a computer, a concentrated processing system, wherein a plurality of terminal equipment are connected to a main computer, has been the mainstream. In the meantime, in the case of a distributed network computing system, a plurality of computers are connected with each other by a network and resources that the respective computers own, are commonly used, and the effective processing can be performed. An environment, wherein the application software are processed by different types of the computers, is called as a distributed computing environment.
In the network, wherein the distributed computing is realized, it is not necessary for the users to know, where are programs and data. As the network functions theoretically, as if the whole network is a computer, the users can utilize the necessary data and functions in their operating situation.
As portable data terminals, such as a personal digital cellular and a personal handyphone system) become popular, the mobile computing has become realistic. For example, it has been made possible, easily to call up the mail outside of the company, and to refer to the information of WWW (World Wide Web) by a combination of PHS and Notebook Personal computer. However, in the mobile environment, there has been a limitation that the same maneuverability as in the office cannot be expected out of the office.
Such limitations are that the communication is interrupted during the communication, or that the display screen of the mobile terminals are uncomfortable to see because of its small size. Under the mobile computing environment, a part of the work, which can be executed only in the office, can be executed out of the office, time can be saved and a quick transaction can be realized. As an application for the mobile computing at its early stage, checking of the electronic mail and confirmation of notice board can be considered. Furthermore, a work that can be executed in the office upon return to the office in order to refer the data available only in the office, can be executed at the office of the customer. As explained in the above, not only the works can be executed out of the office as if works are executed in the office, but also the form of the works which could not be realized in the past environment, can be realized.
Now then, as for the form of the system in case of the mobile computing, several models can be considered depending upon the main portion of the communication. In this case, a model, in which the client takes the initiative and the server computer in the office is utilized by a mobile terminal, is assumed. Besides this form, a form, in which the server computer controls its terminals depending the information from the mobile terminal, as well as a form in which the server computer is used as a hub station that connect the mobile terminals each other, can be considered.
On the other hand, there are many restrictions for accessing to the data in the office, as the mobile communication is used. At the present time, problems such as circuit speed, circuit quality, circuit troubles and communication rates can be considered.
Though a conversion of the attribute data, which are subjected to a control in a network control system, as shown in Laying-Open Hei8-16500, and a conversion of the application program for telephone and data communication as shown in U.S. Pat. No. 5,572,675, can be considered, these prior arts disclose nothing to solve the problems, which arise in the form of the system for mobile computing.
Furthermore under the environment of network computing such as mobile computing as described in the above, for example, when the circuit which was connecting the terminal and the server computer, was broken by any reason, the work that had been done between the terminal and the server computer before the breakdown became insignificant, and it was necessary to repeat the same work. Also, under the net work computing environment such as the mobile computing described in the above, when a data processing job, which required a long time, was instructed from a terminal to the server computer, the terminal had to wait with the circuit being connected, until the processing of the aforementioned job was finished by the server computer. So that, the communication rate became high. Besides, during the processing is executed, any other work could not be done on the side of the terminal, which was very inconvenient. Furthermore, the security was not perfect. Further problem is that, the user of the terminal was compelled to login (logon) every time, when the user tried to access to a desired server computer or an application software, which maneuverability was inferior and efficiency was not perfect. Furthermore, There were also cases in the prior art that it was very hard to login (logon) depending upon the type of the terminal used. There were also cases that it was impossible to access to or to login (logon) a desired server computer or an application software depending upon the type of the terminal.
BRIEF SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to dissolve the aforementioned problems, and to have application services provided in accordance with the processing capacity of the respective terminal equipment in an environment of the network, wherein various kinds of terminals are existing. Another object of the present invention is, to provide a distributed network computing system, a data exchange apparatus used for the said system, a data exchange method used for the said system and the memory media in which the said method is stored and which can be readout by a computer, which can provide an application service in accordance with the communication capacities of the said infrastructures, even if a plurality of communication infrastructures coexisteds in the environment. In other words, the object of the present invention is to dissolve the aforementioned problems and to have a work in the office continuously executed even in the environment of the mobile computing system.
The another object of the present invention is to have a countermeasure properly taken, even when the communication is broken down during the communication, and further to have the terminal equipment effectively utilized even at the processing data which require a long time, and to provide a economically excellent system and to attain a high security function and to improve the login (logon) function.
In order to attain the said objects, the present invention is conceived as follows:
(1) A distributed network computing system is provided which comprises an data processing apparatus, which supplies an application service such as various application software, various kinds of terminals, which receive the application service from the said data processing apparatus, and a communication network, which connects said data processing apparatus and said terminals, wherein said data processing apparatus is provided with a data exchange device, and said data exchange device further comprises an access control means which controls the connection from the said terminals, a security control means which judges the certification of said terminals with regard to said access means and a function converting means, which converts the contents of the ap
Mizuhara Toru
Ueda Hiroshi
Utsumi Masaki
Yamagami Toshiyuki
Barot Bharat
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Kabushiki Kaisha Toshiba
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