Multiplex communications – Network configuration determination
Reexamination Certificate
1998-12-17
2002-07-09
Ngo, Ricky (Department: 2661)
Multiplex communications
Network configuration determination
C370S252000, C370S351000, C703S001000, C703S013000
Reexamination Certificate
active
06418123
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a computer assisted access communication network designing system, a designing tool thereof, and a record medium from which a computer reads a program that causes the computer to accomplish the access communication network designing system. In particular, the present invention relates to a computer assisted access communication network system that calculates an access communication network structure and necessary civil construction facilities that are accomplished at low deployment costs and that satisfy a demand considering geographical shape, facility deployment position alternative, subscription demand, and existing facilities with limited conditions of communication quality, deployed positions of communication facilities, and so forth and relates to a designing tool thereof and a record medium from which a computer reads a program that causes the computer to accomplish the access communication network system.
2. Description of the Related Art
In recent years, computer assisted access communication network designing tools (systems) for LAN, mobile systems, backbone (high speed, long distance communication line) systems, CATV systems, and so forth have been placed particularly in the global market. In particular, mobile system designing tools with an automatic designing function (that allows a communication network structure to be automatically calculated corresponding to input data, geographic information, and so forth) have been increasingly used. On the other hand, designing work is computerized with CAD/CAM and the like. Thus, it is desired to use and improve a computer assisted access communication network designing system for designing a public telephone network, performing a recovery operation of an emergency public telephone line, and designing a local area network such as LAN or WAN.
As such prior art references, (1) Japanese Patent Laid-Open Publication No. Hei-4-316167, (2) paper by Hiroyuki Kawakami, 1996 Society Convention, “The Institute of Electronics, Information and Communication Engineers,” Japan, B-792, and (3) paper by Hiroyuki Kawakami, 1997 Society Convention, The Institute of Electronics, Information and Communication Engineers, Japan, SB-8-9 have been disclosed.
In a conventional access communication network designing system, facilities are not clearly categorized as communication facilities and civil construction facilities thereof. Thus, when an access communication network is automatically designed with such a system, the designer cannot edit and define existing facilities.
In reality, when an access communication network is designed, its structure and deployment of facilities thereof should be calculated corresponding to geographical information, subscription demand information, facility information, and design parameter information with limited conditions such as communication quality assuming that the existing facilities are not present so that the deployment cost is reduced.
However, under such limited conditions, when a broad band access communication network is designed, existing communication facilities and civil construction facilities of a conventional narrow band access communication network cannot be re-used. In addition, the designer cannot freely define facility deployment position alternatives. Before the system automatically designs an access communication network, the designer cannot designate facility deployment positions. Moreover, the system cannot automatically design an additional network using a blank capacity with the existing facilities. Thus, the designer cannot limit the facility deployment positions and reduce the cost using the existing facilities with the system.
SUMMARY OF THE INVENTION
To solve such problems, the inventors of the present invention have filed a non-opened art reference as Japanese Patent Application No. 09-195100. This art reference is a designing system for designing an access communication network structure and deployment positions of facilities thereof at low deployment costs corresponding to design parameter information including geographic information, subscription demand information, facility information, and initial accommodation ratio in a design area, the designing system comprising a facility defining means for defining position information and facility information for communication facilities such as communication units, cables, and management/test systems and civil construction facilities such as ducts and overhead cable facilities; a facility deployment position alternative defining means for defining deployment position alternatives for communication/civil construction facilities; and an automatic designing means for prohibiting existing facilities from being moved or deleted corresponding to input/edited data or automatically calculated facility information and for automatically calculating an access communication network structure and necessary civil construction facilities at low deployment costs in an appending format and free from an influence of the accommodated lines.
The filed art reference allows the accuracy of the calculated results of a low cost access communication network structure to be improved and an exceptional deployment position to be designated. Thus, when the designer designates one type of appending design mode to each facility, the system performs a first appending designing function that does not affect existing facilities, a second appending designing function based on designed results, and a third appending designing function performed in many years.
In the designing method of the filed art reference, an access communication network structure can be calculated at low facility deployment cost at a time in an appending format corresponding to communication/civil construction facility information (such as geographic information, subscription demand information, and capacitance in a design area), existing communication/civil construction facility information, and facility deployment position alternative information.
However, the above-described art reference has the following problems.
As a first problem, even if a route at the minimum cost is obtained considering the binding of cables, the route contains many bends. Thus, such a route may not be suitable from views of management and maintenance. In other words, it is difficult for the designer to input the number of bends of the route before the system automatically designs a relevant access communication network. Even if the designer inputs the number of bends, since the number of spaces to be solved increases, the system takes a long time to calculate an access communication network at low deployment cost with given limited conditions.
As a second problem, when the designer edits/inputs a facility at a desired position and designates “fixed mode” to the newly input facility as an existing facility, the cost of the newly input facility is not included in the total cost. Thus, the designer cannot know the cost of the newly input facility.
As a third problem, since the system designs an access communication network structure assuming that the land costs in the design area are the same, the accuracy of the designed results in an area whose land cost is dominant deteriorates.
An object of the present invention is to provide a designing method for designing an access communication network corresponding to limited conditions such as bends of a deigned route considering low deployment cost and low land costs. Another object of the present invention is a record medium from which a computer reads a program that causes the computer to perform the access communication network designing method.
To solve the above-described problems, the present invention is a system for calculating an optimum access communication network structure in an appending format considering geographic shape, facility deployment position alternatives, subscription demand, existing facilities, and so forth with a computer. In the system, along with “fixed mode” for p
Kawakami Hiroyuki
Okazaki Hiroyuki
NEC Corporation
Ngo Ricky
Phan Tri
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