JPH08251182A - Virtual path capacity control device - Google Patents

Abstract

PURPOSE: To change the contents of the method of control in accordance with a situation, and to flexibly deal with the change of a network condition or a traffic condition by sorting and distributing the control among independent virtual path(VP) capacity control element device groups. CONSTITUTION: A quality judging device 21, a necessary zone calculating device 22, an increased quantity calculating device 23, a decrease designing device 24, and a storage designing device 25 are provided, and each of these is connected to a data base 14. The quality judging device 21 is connected to the necessary zone calculating device 22, and the necessary zone calculating device 22 is connected to the increased quantity calculating device 23 and the decrease designing device 24, and the increased quantity calculating device 23 and the decrease designing device 24 are connected to the storage designing device 25. Thus, in the case where VP capacity control becomes not to function effectively because of the change of the network condition or the traffic condition, only the element device not functioning effectively needs to be changed. Accordingly, the change of the network condition or the traffic condition of an ATM network can be dealt with flexibly by the selection of the proper element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used for information transmission in an asynchronous transfer mode (hereinafter referred to as "ATM"). In particular,
By dynamically changing the capacity of the virtual path (hereinafter referred to as "VP") according to the usage status, the amount of equipment corresponding to the service demand and traffic volume at each time is distributed to the network, and the efficient operation of the communication network is achieved. Technology that enables

[0002]

2. Description of the Related Art A conventional communication network such as a telephone is provided in a well-known technology in a synchronous transfer mode (hereinafter referred to as "STM"), which is a bundle of lines that can be set between two exchanges. The bandwidth of each path is fixed to a predetermined value for each path.This value is recognized by the exchange that selectively connects telephone lines and other lines, and multiplex transmission is possible in the network. Since the transmission equipment performing the operation was aware, it was not possible to change the bandwidth of the path while the line was still connected, so it is possible to respond flexibly to fluctuations in demand for communication services and unpredictable fluctuations in traffic volume. It was not possible, and there was a limit to the efficient operation of network resources.

On the other hand, in recent years, in a broadband ISDN that comprehensively handles a plurality of communication services such as telephone, data communication, image communication, etc., a fixed length cell is transferred by an asynchronous transfer mode. It has become possible to realize centralized exchange processing that does not depend on the type of communication service. In the ATM network, a VP, which is a logical path that specifies a usable band between two exchanges instead of the path, is proposed, and a virtual channel (hereinafter, "VC") that is a logical line set in the VP is proposed. It is possible to dynamically allocate a band to the VP while keeping the connection), and various capacity control methods have been proposed.

Regarding the structure of the transmission line network using the VP,
For example, it is described in detail in Sato, Kaneda, Torisawa, “Structure of high-speed burst multiplex transmission system”, Institute of Electronics, Information and Communication Engineers, Information Network Research Group material, IN87-84, 1987. Regarding traffic control in the ATM network, for example, Sato, Kawashima and Sato, "Traff
ic Control in ATM Metworks ", IEICE Transactions, V
ol. E74, No. 4, April 1991.

In the ATM network, various information is transferred in the form of cells in the network, and a cell flow flowing between two virtual channel handlers (VCH) terminating a VP has a band of the VP set between the VCHs. Transferred using. For this reason, when the VP band is smaller than the inflow cell amount, a cell loss or a quality deterioration such as a connection failure (call loss, overflow) of the VC which is a new cell generation source occurs.

As an example of the VP bandwidth control algorithm, see Ohta, Sato, "Study on Virtual Path Capacity Variable in High-Speed Burst Multiplexing Transmission System", IEICE, Material of Image Optics Research Group, IE88-90. And Shioda, Uose, "Virtual Path Bandwidth Cont
rol Method for ATM Networks: Successive Modificati
on Method, "IEICE Transactions, Vol.E.74, No.12, De
There is one shown in cember 1991.

[0007]

The VP capacity control technology proposed so far determines a quality judgment method, a required bandwidth calculation method, an expansion amount calculation method, and a reduction design method, respectively.
It is realized as a function that combines them. However, the ATM network is expected to handle a wide variety of services in an integrated manner, and it is considered that the usage status of each VP in the network, and eventually the usage status of the entire network, changes in various ways. Therefore, even if only one fixed VP capacity control method is adopted for all VPs, there is a risk that it will not be able to keep up with changes in network conditions or traffic conditions.

The present invention solves such a problem, and provides a VP capacity control device capable of changing the contents of a control method according to circumstances and flexibly responding to changes in network conditions or traffic conditions. With the goal.

[0009]

A VP capacity control device of the present invention is a VP capacity control device for increasing / decreasing VPCs set between a plurality of VCHs provided in an ATM network. Between a quality judging device for judging the state of transmission quality, a necessary band calculating device for calculating a band necessary for VPC from data regarding target traffic, and a necessary band calculated by this necessary band calculating device and a target VPH. An expansion amount calculation device that calculates the VP capacity that can be actually expanded from the accommodation state of the VPC accommodated in the physical transmission path, and a transmission path that accommodates the VPC if the required bandwidth cannot be expanded. Other VP
A reduction design device that obtains a VPC that is a candidate for removal from the data related to C, and an accommodation design device that updates the data in the ATM network and increases or decreases the actual virtual path,
The quality determination device, the required bandwidth calculation device, the additional amount calculation device, the reduction design device, and the accommodation design device are configured as independent element devices.

It is preferable that at least one of the quality judgment device, the required band calculation device, the expansion amount calculation device, and the reduction design device is provided with a plurality of different algorithms. In this case, a quality control device, a required bandwidth calculation device, an expansion amount calculation device, and a reduction design device are selected and operated by a supervisory device, and each element device is connected to operate via the supervisory device. Is good.

The quality judgment by the quality judgment device is performed by the VPC.
May be a target, a VPG that is a bundle of VPCs sharing VCHs at both ends may be a target, or a destination VCH may be a target. It is also possible to select and use any one of a plurality of quality determination devices having different quality determination targets.

[0012]

According to the present invention, quality judgment, required bandwidth calculation, expansion amount calculation, reduction design,
It is classified into five elements of the accommodation design and defined as an independent VP capacity control element device group. As a result, when the VP capacity control does not function effectively due to changes in network conditions or traffic conditions, it is only necessary to change the element device that does not function effectively.

Further, by providing a plurality of devices for each of the quality judgment, the required band calculation, the expansion amount calculation and the reduction design, various VP capacity control can be realized.

It is also possible to provide a supervisory device, select one of each of the component devices provided with a plurality of devices, and combine them to execute the VP capacity control. In this case, no interface is provided between each element device, and an interface is provided only between the supervisory device and each element device. This can reduce the number of interfaces in the device.

For quality judgment, not only the judgment method can be selected, but also the quality management target can be selected from among VPC, VPG, and departure / arrival VCH.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining an ATM network in which VP capacity control is performed. Virtual path handlers VPH1 and VPH2 for exchanging VPs (also called "cross-connect" because call setup processing is not normally performed). 4) via four virtual channel handlers VCH1-4. Here, between VCH1 and VPH1, VCH
2, VPH1, VCH3, VPH2, VCH4, V
The physical transmission links between PH2 and between VPH1 and VPH2 are designated as "transmission path 1", "transmission path 2",
These are referred to as "transmission path 3", "transmission path 4", and "transmission path 5". A VP set between VCHs is called a VP connection (VPC), and a group of VPCs having the same VCH at both ends is called a VP group (VPG). VC
A VP group VPG1 passing through the transmission path 1 and the transmission path 2 is set between H1 and VCH2.
Includes VP connections VPC 11 and 12. V
A VP group VPG2 passing through the transmission path 2, the transmission path 5, and the transmission path 3 is set between CH2 and VCH3, and the VP connection VPC21, 2 is set in this VPG2.
2 is included. A VP group VPG3 passing through the transmission path 3 and the transmission path 4 is set between the VCH3 and VCH4, and the VP connection VPC31,
32 are included. A VP group VPG4 passing through the transmission path 4, the transmission path 5, and the transmission path 1 is set between the VCH4 and VCH1, and the VPG4 includes VP connections VPC41 and 42. VCH1, VCH3
A VP group VPG5 passing through the transmission path 1, the transmission path 5, and the transmission path 3 is set between them, and this VPG 5 includes a VP connection VPC 51.

The network is further provided with a traffic database device 11, a VP capacity control device 12 and a transmission system database device 13. The traffic database device 11 is connected to all VCHs existing in the network by a signal line and collects traffic information using this signal line. The VP capacity control device 12 controls all Vs existing in the network.
It is connected to CH by a signal line, and VP is connected using this signal line.
Gather information necessary for capacity control and give instructions for control.
The transmission system database device 13 is connected to all VCHs and VPHs existing in the network by signal lines, and organically manages data relating to transmission paths and data relating to VPs. Also, the traffic database device 11 and the VP
Between the capacity control device 12 and the VP capacity control device 12
And the transmission-system database device 13 are also connected by signal lines to exchange necessary information. In FIG. 1, signal lines related to the traffic database device 11, the VP capacity control device 12, and the transmission system database device 13 are omitted for the sake of easy viewing of the drawing.

Data examples relating to transmission paths and data examples relating to VPs managed by the transmission system database device 13 are shown in Tables 1 and 2, respectively, and some examples of traffic data of VPs managed by the traffic database device 11 are shown in Table 3. Show. The data regarding the transmission path is represented as a table including a record indicating the capacity of each transmission path and a record indicating a band of an unset portion of the band that is not set to any VP.
In addition, the data regarding the VP includes a record indicating the bandwidth of each VPC existing in the network, and the VP.
C is represented as a table including a record indicating whether or not C is set in each transmission path. For example VPC
If it is 11, the VPC is set to the transmission paths 1 and 2, so those records are “T”, and the transmission paths 3 to 5
Is not set in, so those records are represented as “F”. Traffic data is VPC of each
Is represented as a table including a record of the number of calls added to the VPC and a record of the bandwidth call volume added to the VPC.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

[Table 3]

FIG. 2 shows a VP capacity control device 12, a traffic database device 11 and a transmission system database device 1.
3 shows the relationship with various accumulated data. In the following, the traffic database device 11 shown in FIG.
The transmission system database device 13 is shown as one database 14. In the conventional VP capacity control device, VP capacity control is performed as a combination of quality judgment, required bandwidth calculation, expansion amount calculation, and reduction design from various data. Therefore, if the VP capacity control does not function effectively due to changes in network conditions or traffic conditions, V
All P capacity controllers had to be changed. On the other hand, in the present invention, the VP capacity control device 12 is subjected to quality judgment,
The device is divided into five components, which are the required bandwidth calculation, the expansion amount calculation, the reduction design, and the accommodation design. An example thereof is shown in FIGS.

FIG. 3 is a block diagram showing the VP capacity control device of the first embodiment of the present invention together with the database device. The device of this embodiment includes a quality determination device 21, a required bandwidth calculation device 22, an expansion amount calculation device 23, a reduction design device 24, and an accommodation design device 25, each of which is connected to the database 14. The quality determination device 21 is connected to the required band calculation device 22, the required band calculation device 22 is connected to the expansion amount calculation device 23 and the reduction design device 24, and the expansion amount calculation device 23 and the reduction design device 24 are the accommodation design device. 25
Connected to. With this configuration, when the VP capacity control does not function effectively due to changes in network conditions or traffic conditions, only the element devices that do not function effectively need to be changed.

FIG. 4 is a block diagram showing the VP capacity control device according to the second embodiment of the present invention together with the database device. The apparatus of this embodiment is different from the first embodiment in that two kinds of quality judgment devices 21 and required band calculation devices 22 are provided. Quality determination device 21 or required band calculation device 22
By selecting each of these, four kinds of VP capacity control algorithms can be made as a whole, and it becomes possible to select a VP capacity control algorithm corresponding to changes in network conditions or traffic conditions.

FIG. 5 is a block diagram showing the VP capacity control device of the third embodiment of the present invention together with the database device. The apparatus of this embodiment includes a plurality of quality determination devices 21, a required band calculation device 22, an additional amount calculation device 23, and a reduction design device 24, respectively, and further includes a supervisory device 26 that selects and operates each of them. This is different from the first and second embodiments. Further, although each element device is connected to the database 14 and the supervisory device 26, there is no connection between each elemental device, and the element devices operate via the supervisory device 26. In the configuration of the second embodiment, as the number of element devices increases, the total number of interfaces that have to be provided between the element devices will increase dramatically, but as in the third embodiment, through the supervisory device 26, By connecting, it is possible to suppress an increase in the number of interfaces as a whole.

Quality judging device 21, required band calculating device 2
2, configuration examples of the expansion amount calculation device 23, the removal design device 24, the accommodation design device 25, and the supervisory device 26, respectively.
11 to FIG.

The quality judgment device 21 (FIG. 6) is the storage device 2.
11, a comparison device 212, a calculation device 213, and a signal transmission / reception device 214. The signal transmission / reception device 214 is connected to the database 14 (traffic database device 11) and the supervisory device 26 via a signal line, and transmits / receives signals. The arithmetic unit 213 calculates the usage rate from the data regarding the traffic read from the database 14. The storage device 211 holds a predetermined usage rate upper limit value and usage rate lower limit value. The comparison device 212 compares the calculated usage rate with the stored value.

The required bandwidth calculation device 22 (FIG. 7) comprises a storage device 221, an addition device 222, a subtraction device 223 and a signal transmission / reception device 224. The signal transmitting / receiving device 224 is
It is connected to the database 14 (traffic database device 11) and the supervisory device 26 by a signal line to send and receive signals. The storage device 211 holds a predetermined unit amount. The adder 222 adds a unit amount to the capacity of the VP read from the database 14 and adds the addition request VP.
Calculate the required bandwidth of The subtraction device 223 subtracts a unit amount from the capacity of the VP read from the database 14 to calculate the necessary bandwidth amount of the VP that can be removed.

The expansion amount calculation device 23 (FIG. 8) includes a calculation device 231 and a signal transmission / reception device 232. The signal transmitting / receiving device 232 is connected to the database 14 (transmission system database device 13) and the supervisory device 26 by a signal line,
Send and receive signals. The arithmetic unit 231 calculates the minimum value of the free capacity of the plurality of transmission paths accommodating the specific VPC read from the database 14, and sets it as the expandable capacity of the VPC.

The reduction design device 24 (FIG. 9) is a storage device 2.
41 and a signal transmission / reception device 242. The signal transmission / reception device 242 is connected to the database 14 (transmission system database device 13) and the supervisory device 26 by a signal line, and transmits / receives a signal. The storage device 241 associates the VPC name notified from the supervisory device 26 with one or more transmission path names that accommodate the VPC read from the database 14 and other VPC names that the transmission path accommodates,
Hold temporarily.

The housing design device 25 (FIG. 10) comprises a storage device 251 and a signal transmitting / receiving device 252. The signal transmission / reception device 252 is connected to the database 14 (transmission system database device 13), the supervisory device 26, and the VCH on the network by a signal line, and transmits / receives a signal. The storage device 251 temporarily holds data regarding the VP whose capacity is to be changed.

The supervision device 26 (FIG. 11) is a storage device 26.
1, an expanded VPC determination device 262, a comparison device 263, a reference device 264, and a signal transmission / reception device 265. The signal transmission / reception device 265 is connected to each element device by a signal line and transmits / receives a signal. Storage device 261 requires additional V
An expansion request VPC table that holds the name of the PC and the current capacity, and a removable VPC table that holds the name of the removable VPC and the current capacity are stored. The expansion VPC determination device 262 determines that the VP on the expansion request VPC table
C is ranked according to rules such as the required expansion amount and the current capacity order, and the highest VPC is selected as the expansion target. The comparison device 263 has an expansion amount for the VPC calculated by the required bandwidth calculation device 22 and the VPC calculated by the expansion amount calculation device 23.
It is determined whether or not the actual expansion is possible based on the size relationship with the realizable expansion amount. The reference device 264 selects a common part with the list of VPCs on the removable VPC table and the list of the candidate VPCs for removal notified from the removal designing device as the removed VPC.

A VP capacity control device 12 consisting of these element device groups targets the network shown in FIG.
The operation when the capacity control is performed will be described focusing on the operation of the supervisory device 26. Although the management target may be between the VPG and the departure / arrival VCH, the case where the management target is the VPC will be described below. When the management target is between VPGs and departure / arrival VCHs, the VP capacity is increased / decreased based on the quality result between VPGs and departure / arrival VCHs, etc., but the control method is the same as in the case of VPC. It should be noted that all communication between the element devices or with the database is performed through the signal transmitting / receiving device in each element device, but since it is redundant, it will be omitted in the following description.

First, the quality judgment will be described. For quality determination, the supervisory device 26 notifies the quality determination device 21 of the names of all VPCs in the network, and requests quality determination. Upon receiving a request from the supervisory device 26, the quality judgment device 21 reads the capacity of each VPC, the carried bandwidth call amount, and the data measurement period from the traffic database device 11, and uses the arithmetic device 213 to determine the usage rate of each VPC. calculate. The quality determination device 21 further compares the calculated usage rate with the usage rate upper limit value and usage rate lower limit value held in the storage device 211 by the comparison device 212. As a result of the comparison, the VPC whose usage rate exceeds the usage rate upper limit value (referred to as VPC11) requires expansion, and the VPC whose usage rate is below the usage rate lower limit value (VP)
C22, VPC31, VPC32, VPC41, VPC
51) can be removed, VP that does not apply to either
C (VPC12, VPC21, VPC42) judges that the current state is maintained, and notifies the supervisory device 26 of the name and capacity of the VPC which is judged to be required to be added or deleted. The supervising device 26 stores the name of the VPC determined to require the addition in the addition request VPC table and the name of the VPC determined to be able to be deleted in the reduction allowed VPC table.

Next, the required band calculation will be described. The supervisory device 26 notifies the required band calculation device 22 of the names of all VPCs on the extension request table and the fact that the amount of expansion has been calculated, and requests the required band calculation. Required bandwidth calculation device 22
Reads out the capacity of each VPC from the traffic database device 11 and uses the adder 222 to add the capacity of the VPC and the value of the unit quantity held in the storage device 221 to obtain the required bandwidth of the VPC. . The required bandwidth calculation device 22 further notifies the supervisory device 26 of the capacity of the VPC and the value of the required bandwidth.

Next, the expansion amount calculation will be described. The supervisory device 26 uses the additional VPC determining device 262 to select one additional VPC from the VPCs on the additional request table (herein referred to as VPC 11). Furthermore, VPC1
In order to confirm whether 1 can be added, the supervisory device 26
Notifies the additional amount calculation device 23 of the name of the VPC 11 and requests the additional amount calculation. The expansion amount calculation device 23 reads the transmission path name (transmission path 1, transmission path 2) accommodating the VPC 11 from the transmission system database device 13. Further, the expansion amount calculation device 23 reads out the free capacity of the transmission path 1 and the transmission path 2 from the transmission system database device 13, obtains the minimum value among them using the arithmetic device 231, and supervises it as a realizable expansion amount. Notify the device 26. Supervision device 2
6 uses the comparison device 263 to determine the amount of expansion that can be realized,
The difference between the required bandwidth of the VPC 11 and the current capacity is compared, and it is determined that the former can be expanded if the former is large and the expansion cannot be completed if the latter is larger.

Next, the expansion design will be described. When it is determined by the calculation of the amount of expansion that the VPC cannot be completely expanded, the supervisory device 26 notifies the reduction design device 24 of the name of the VPC 11 and requests the reduction design. Reduction design device 2
Reference numeral 4 reads out the transmission path name (transmission path 1, transmission path 2) accommodating the VPC 11 from the transmission system database device 13. Based on the read transmission path name, the reduction design device 24 stores the VCP names (VPC12, VPC21,
VPC22, VPC41, VPC42, VPC51) is read out, and those names are notified to the supervisory device 26. The supervisory device 26 uses the reference device 264 to compare the VPC name notified from the removal designing device 24 with the VPC name on the removable VPC table, and match the matched VPCs 22 and VP.
The C41 and the VPC 51 are set as reduction candidate VPCs, and the required band calculation device 22 is notified that the name of the reduction candidate VPC and the amount of reduction are calculated, and the required band calculation is requested. The required bandwidth calculation device 22 reads the capacity of each removal candidate VPC from the traffic database device 11 and subtracts it from the subtraction device 213.
By subtracting the value of the unit amount on the storage device 211 from the value to obtain the required bandwidth of the removal candidate VPC,
The supervisory device 26 is notified of the capacity of the PC and the value of the required bandwidth.

Finally, the housing design will be described. The supervision device 26 stores the names of the VPCs 22, VPC 41, and VPC 51, which are candidates for reduction, and the amount of reduction, in the accommodation design device 25.
In addition, the name of the VPC 11 to be added at the same time and the amount of the addition are also notified to the accommodation design device 25.
The accommodation design device 25 holds data regarding each VPC in the storage device 251. The accommodation design device 25 further includes the VPC 22, VPC 41, and
The data relating to the VPC 51 is changed, and the data area relating to that VPC on the VCH terminating each VPC is changed. Next, the accommodation design device 25 changes the data regarding the VPC 11 on the transmission system database device 13,
VPC on VCH (VCH1, VCH2) terminating 1
Change the data area for 11. After this, the accommodation design device 25 notifies the supervisory device 26 of the end of the accommodation design. Due to this notification, the supervisory device 26 deletes the VPC 22, VPC 41, and VPC 51 from the removable VPC table and deletes the VPC 11 from the expansion request VPC table. The supervising device 26 further refers to the expansion request VPC table, and if there is an expansion required VPC, returns to the operation for calculating the required bandwidth. Addition required VP to the addition required VPC table
If there is no C, it is determined that all the expansions have been completed, and all the VPCs (VPC31, VPC31,
VPC 32) is deleted.

In the above operation, when the quality judgment device 21 for judging the quality based on the call loss ratio is used, when the quality judgment device 21 receives a request from the supervisory device 26, the usage ratio of each VPC is calculated. Instead, the number of calls added to each VPC and the number of calls with a call loss are read from the transmission system database device 13 and the call loss rate of each VPC is calculated using the arithmetic unit 211.

When the Erlang B formula is used for calculating the required bandwidth, the required bandwidth calculating device 22 is the traffic database device 11 and the supervisory device 2 through the signal line.
6, a signal transmission / reception device, a storage device that holds a predetermined target call loss ratio, and a traffic volume that satisfies the target call loss ratio that is held in the storage device with respect to the added call volume read from the traffic database device 11. An arithmetic unit for calculating the severity from the known Erlang B equation and converting it to a value corresponding to the VP capacity is used. In that case, in the required band calculation, the required band calculation device 22
The capacity of each VPC is read from the traffic database device 11, and the required bandwidth of the VPC is calculated from the traffic multiplicity that satisfies the target call loss rate held in the storage device by using the arithmetic device. At the time of the removal design, the required bandwidth calculation device 22 reads the capacity of each removal candidate VPC from the traffic database device 11, and uses an arithmetic device to determine the VPC from the traffic multiplicity satisfying the target call loss rate held in the storage device. Calculate the required bandwidth for each VP
The supervisory device 26 is notified of the capacity of C and the value of the required band.

Further, as a more advanced method, a new VPC determining device is newly provided in the supervisory device 26 so that not all the candidate VPCs for removal can be added in the initial stage of the accommodation design. It is also possible to eliminate as many VPCs as necessary (for example, the VPC 22 and VPC 41 in the above example).

[0042]

As described above, the VP capacity control device of the present invention classifies the control and distributes it to the independent VP capacity control element device group, so that the network condition of the ATM network or The effect is that it can flexibly respond to changes in traffic conditions.

Further, by providing a plurality of devices for each of the quality judgment, the required bandwidth calculation, the expansion amount calculation, and the reduction design, there is an effect that various VP capacity control can be realized.

When a supervisory device is provided and one of a plurality of component devices is provided and one of them is selected to perform VP capacity control by combining them, an interface is provided between the component devices. There is an effect that it is not necessary to provide it, and an increase in the number of interfaces in the device can be suppressed.

Furthermore, for quality judgment, not only the judgment method can be selected, but also the quality management target can be selected, so that the VP capacity control can be made more flexible.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an ATM network in which VP capacity control is performed.

FIG. 2 is a diagram showing a relationship between a VP capacity control device and various data.

FIG. 3 is a block configuration diagram showing a VP capacity control device according to the first embodiment of the present invention.

FIG. 4 is a block configuration diagram showing a VP capacity control device according to a second embodiment of the present invention.

FIG. 5 is a block configuration diagram showing a VP capacity control device according to a third embodiment of the present invention.

FIG. 6 is a block configuration diagram showing an example of a quality determination device.

FIG. 7 is a block diagram showing an example of a required bandwidth calculation device.

FIG. 8 is a block diagram showing an example of an expansion amount calculation device.

FIG. 9 is a block configuration diagram showing an example of a reduction design device.

FIG. 10 is a block configuration diagram showing an example of a housing design device.

FIG. 11 is a block diagram showing an example of a supervisory device.

[Description of Reference Signs] VCH1 to 4 virtual channel handlers VPH1 and 2 virtual path handlers VPG1 to 5 virtual path groups VPC11, 12, 21, 22, 22, 31, 32, 41, 4
2, 51 Birch path connection 11 Traffic database device 12 VP capacity control device 13 Transmission system database device 14 Database device 21 Quality judgment device 22 Required bandwidth calculation device 23 Expansion amount calculation device 24 Reduction design device 25 Housing design device 26 Supervisory device 211 221, 241, 251, 261 storage device 212, 263 comparison device 213, 231 arithmetic device 214, 224, 232, 242, 252, 265 signal transmission / reception device 222 addition device 223 subtraction device 262 expanded VPC determination device 264 reference device

Claims (7)

[Claims] 1. A virtual path capacity control device for increasing or decreasing the number of virtual path connections set between a plurality of virtual channel handlers provided in an asynchronous transfer mode network, for determining the state of transmission quality from data related to target traffic. Quality determination device, a required bandwidth calculation device that calculates the bandwidth required for the virtual path connection from the data related to the target traffic, and a physical bandwidth between the required bandwidth calculated by this required bandwidth calculation device and the target virtual channel handler. An expansion amount calculation device that calculates the virtual path capacity that can be actually expanded from the accommodating state of the virtual path connections accommodated in various transmission paths, and the virtual path connection is accommodated when the required bandwidth cannot be expanded. Other virtual of the transmission path to A reduction design device that obtains a virtual path connection that is a candidate for reduction from data related to connection, and an accommodation design device that updates the data in the asynchronous transfer mode network to increase or decrease the actual virtual path, A virtual path capacity control device, wherein the quality determination device, the required bandwidth calculation device, the expansion amount calculation device, the reduction design device, and the accommodation design device are configured as independent element devices. 2. The virtual path capacity according to claim 1, wherein at least one of the quality judgment device, the required bandwidth calculation device, the expansion amount calculation device, and the reduction design device is provided with a plurality of different algorithms. Control device. 3. A quality control device, a required bandwidth calculation device, an extension amount calculation device, and a supervisory device for operating each of the reduction design devices one by one, and the quality determination device and the required bandwidth calculation device. The virtual path capacity control device according to claim 2, wherein the device, the expansion amount calculation device, the reduction design device, and the accommodation design device are connected so as to operate via the supervisory device. 4. The virtual path capacity control device according to claim 1, wherein the quality judgment device judges quality for a virtual path connection. 5. The virtual path capacity control apparatus according to claim 1, wherein the quality judgment apparatus judges quality for a virtual path group which is a bundle of virtual path connections sharing the virtual channel handlers at both ends. 6. The virtual path capacity control device according to claim 1, wherein the quality judgment device judges quality between incoming and outgoing virtual channel handlers. 7. A first quality determination device for determining quality for a virtual path connection and a second quality determination for a virtual path group, which is a bundle of virtual path connections sharing a virtual channel handler at both ends. 4. The virtual system according to claim 2 or 3, further comprising: a quality judgment device of claim 3, a third quality judgment device for judging quality between incoming and outgoing virtual channel handlers, and a means for selecting one of these quality judgment devices. Path capacity controller.