JP2970571B2 - Multiplexing method of virtual path connection group - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asynchronous transfer mode (Asynchronous TransferMod).
e: Hereinafter, in an ATM network, a virtual path connection (Virtual P-connection) having different traffic and quality classes.
a. Connection (hereinafter, referred to as a VPC) group.

[0002]

2. Description of the Related Art In recent years, as the demand for multimedia services has increased, the realization of an ATM that multiplexes, transfers, and exchanges information by dividing it into fixed-length cells has been expected. The ATM network has a virtual channel connection (Virtual C
channelConnection: VCC)
And the above-mentioned VPC. VCC is a connection set by the user, and VPC is a connection obtained by multiplexing VCC, and is generally set between ATM nodes.

[0003] A VPC is used, for example, in a network management system (Network Management System) when configuring or reconfiguring an ATM network.
em: hereinafter, set by NMS). NMS is A
When a VPC is set between TM nodes, traffic between the ATM nodes is predicted to give an appropriate bandwidth capacity. V
The PC can obtain the statistical multiplexing effect by sharing the band with a plurality of VCCs, and can use the network band efficiently. However, it is difficult to obtain the statistical multiplexing effect by the VPC when the traffic between the ATM nodes is small or when the traffic varies greatly.

As means for solving such a problem, V
"Design of a B-ISDN Network Applying the GVP Bandwidth Management Method" for Grouping PCs and Sharing the Bandwidth with Multiple VPCs to Use the Network Bandwidth Efficiently (Transactions of the Institute of Electronics, Information and Communication Engineers, B-IVol. J780B- 1No.8pp.305-
313, August 1995). FIG.
FIG. 11 is a block diagram illustrating a configuration of an ATM network for explaining a conventional “design of a B-ISDN network to which a GVP bandwidth management method is applied”.

[0005] The ATM network shown in FIG.
04. The ATM network includes an ATM node 101
VPCs 120 and 12 between ATM nodes 103 and 104, between ATM nodes 101 and 104, and between ATM nodes 103 and 104, respectively.
1, 122 are set. Here, for simplicity of description, VPCs 120 to 122 are respectively bidirectional VPs.
C, and the quality (Quality of S
service: Hereinafter, it is assumed that the QoS) / traffic class is the same. In addition, VPCs 120 to 122 have only routes set. The bandwidth setting of the VPCs 120 to 122 is performed for all the Vs of the same QoS / traffic class that have the same route between the links of the ATM nodes 101 to 104.
Group VPC (GroupVP) that groups PCs
C: hereinafter given in GVPC) units.

In FIG. 4, ATM nodes 101 and 102,
GVPC between 102 and 103, 102 and 104 respectively
The bandwidth is managed by setting 110, 111, and 112. Therefore, VPCs 120 and 121, VPCs 120 and 122,
The sum of the bands of VPCs 121 and 122 is GVPC1
VPCs 120 to 122 can use the band within a range not exceeding the band set to 10, 111, 112. The used bandwidth of each of the VPCs 120 to 122 is
It is changed as needed each time a new VCC is accommodated / released in each of the VPCs 120-122. VPC120-122
Passes through a plurality of GVPCs 110 to 112, so when accommodating / releasing a new VCC,
All GVPCs 110 through 1 through 120 through 122
At 12, it is necessary to acquire / release the bandwidth.

In this way, even when the traffic carried by each VPC is small or the traffic varies greatly, a statistical multiplexing effect can be obtained by grouping a plurality of VPCs for each link and sharing the bandwidth, The efficient use of the ATM network becomes possible.

[0008]

However, such a conventional system has the following problems. That is, the first problem is that the VPC is set only for the route and does not guarantee the bandwidth as the VPC. Therefore, every time a VCC setting request is issued, the bandwidth must be acquired for each GVPC through which the VPC passes. The acquisition process is complicated. Also, the second
The problem with GVPC is that it has the same quality (QoS) /
Despite being grouped by traffic class VPC, there is a bias in the bandwidth used by a certain VPC,
When traffic is concentrated on GVPC, a specific VP
C may cause an increase in the call blocking rate and a decrease in quality. Further, as a third problem, since the GVPC is set for each QoS class, each time the QoS class increases, a new GVPC must be set and a bandwidth must be allocated.
Even if the utilization rate of the ATM network does not change, it is necessary to change the band of another GVPC to increase the QoS class. The fundamental reason for these issues is that
V of the same QoS class with different routes from the start point to the end point
This is because they are grouped by PC.

[0009] Accordingly, an object of the present invention is to provide a class-specific VPC which has a same route from the start point to the end point and has a different QoS / traffic class and is given a bandwidth in advance, and a class-specific VP.
Grouping the shared VPCs that can share the bandwidth by C and compensating for the bandwidth using the bandwidth of the shared VPC only when the VPC bandwidth for each class is insufficient, thereby efficiently using the bandwidth of the network and acquiring the bandwidth. An object of the present invention is to provide a VPC multiplexing method which reduces processing and guarantees quality according to a class. Another object of the present invention is to provide a method for controlling VPC multiplexing, which is the object of the present invention. For convenience of explanation, a class-structured VPC having the same route from the start point to the end point and having a different traffic class / QoS, and a shared VPC in which the band can be shared by these VPCs is grouped. Traffic / QoS class VPC (Multi-Tra
ffic / QoS class VPC: Hereafter, MVP
C).

[0010]

In order to solve such a problem, the present invention provides a plurality of ATs between a start point and an end point.
A plurality of VPCs on the same route exchanged by M nodes and transmitted on the same link, and a shared VPC having a band shared by the plurality of VPCs via the same route as the plurality of VPCs
And multiplexing a plurality of VPCs and a shared VPC,
It is one which is adapted compensated by the band having a share VPC excess and deficiency of the band of the PC, sharing VP and multiple VPC
At least ATM nodes on the same route that exchange C
Also, a buffer capacity is assigned to each of a plurality of VPCs.
Buffer capacity shared by multiple VPCs
Shared buffers and buffers provided for a plurality of buffers.
Multiple buffer outputs to control cell output speed
Speed adjustment unit and each band of multiple VPCs and shared VPCs
A virtual path connection bandwidth management unit that manages the
Virtual path connection of the starting ATM node on the same route
The bandwidth management unit causes an excess or deficiency of the VPC bandwidth.
And each of a plurality of VPCs managed by itself and a shared VPC
At the same time as changing the bandwidth of the ATM
Sends bandwidth change information to the ATM node,
And the ATM node that has received the bandwidth change information changes
Some capacity of the shared buffer is changed according to the bandwidth.
And control the buffer output speed adjuster
By changing the cell output speed, multiple VPC bands
It changes the area . Therefore, since a band is given to the class-specific VPC constituting the MVPC, it is not necessary to acquire the band every time VCC is set. In addition, since VPCs by class having different traffic / QoS are multiplexed as MVPCs, priority is set according to QoS, so that when traffic concentrates on a specific VPC, traffic of a shared VPC is set according to priority. By reallocating the bandwidth, the quality of each class can be guaranteed. Also, the ATM node serving as the starting point of the MVPC controls the change of the bandwidth of the class-based VPC, notifies all the ATM nodes on the MVPC route of the control result, and each ATM node sets the bandwidth of the class-based VPC. By performing the change, it becomes possible to control the change of the band of the class-specific VPC from the start point to the end point of the MVPC.

[0011] Further, the ATM node is provided with a band change detecting unit for measuring a used band of each of the plurality of VPCs and detecting a band change, and a virtual path connection band managing unit of a starting point ATM node on the same route includes: When the excess or deficiency of the VPC bandwidth occurs, a plurality of VPCs managed by itself and a shared VPC
Change each band of, allocate a part of the capacity of the shared buffer to the capacity of the buffer according to the changed band, and change the cell output speed by controlling the buffer output speed adjustment unit,
Each of the ATM nodes at the relay point and the end point on the same route allocates a part of the capacity of the shared buffer to the capacity of the buffer according to the used bandwidth measured by the bandwidth change detection unit, and controls the buffer output speed adjustment unit. The bandwidth of a plurality of VPCs is changed by changing the cell output speed. Therefore, after the ATM node serving as the starting point of the MVPC controls the band change of the class-based VPC, all the ATM nodes on the MVPC route measure the band of the class-based VPC and detect the band change autonomously. By executing the band change, it becomes possible to control the change of the band of the class-specific VPC from the start point to the end point of the MVPC.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention. The ATM network shown in FIG. 1 includes ATM nodes 220 to 223 and terminals 230 and 231. In FIG. 1, between ATM nodes 220 and 221, A
Between the TM nodes 220 and 223 and the ATM node 222
And 223 between MVPCs 201a, 201b, respectively.
201c is set. The MVPC 201a is a class-based V that accommodates VCCs of traffic / QoS classes A, B, C, and D on the same route from the start point to the end point.
The PCs 210a, 211a, 212a, and 213a are multiplexed with a shared VPC 214a capable of sharing a band with the four class-based VPCs 210a to 213a.

Similarly, the MVPCs 201b and 201c share the class-specific VPCs 210b to 213b with the shared VPC 214.
b, VPCs 210c to 213c by class and shared VPC2
14c is multiplexed. MVPC 201a-2
VPCs 210a to 210c (hereinafter, referred to as 210), VPCs 211a to 211c, (hereinafter, collectively referred to as 211), and VPCs 212a to 212, respectively.
c (hereinafter collectively referred to as 212), VPC2 by class
13a to 213c (hereinafter collectively referred to as 213);
Shared VPCs 214a to 214c (hereinafter collectively referred to as 214
), A band is set in advance. Therefore, the band of the MVPC 201 composed of the class-specific VPCs 210 to 213 and the shared VPC 214 is indicated by the sum of those bands and has a fixed value.

In each of the VPCs 210 to 213, a minimum guaranteed bandwidth and a maximum allowable bandwidth are set according to the class. The minimum guaranteed bandwidth of the class-specific VPCs 210 to 213 is a predetermined band, and the maximum allowable bandwidth is the maximum settable band of the class-specific VPCs 210 to 213. When the bands of the class-specific VPCs 210 to 213 are set to be equal to or larger than the minimum guaranteed band and equal to or smaller than the maximum allowable band, a part of the band of the shared VPC 214 is added to the predetermined band.

The band management of the MVPC 201 is performed in the ATM nodes 220 to 223 which are the starting points.
The ATM nodes 220 to 223 share the bandwidth of the class-specific VPCs 210 to 213 constituting the MVPC 201 and the shared VPC 2
14 remaining bands are managed. ATM nodes 220-22
3 is a case where a new VCC is set in the class-specific VPCs 210 to 213 of the MVPC 201 whose own node is the starting point, or a class-specific VPC 210 to 2-2 is changed by changing the bandwidth of the VCC.
When the bandwidth of 13 is insufficient, a part of the remaining bandwidth of the shared VPC 214 is added to the current bandwidth of the VPCs 210 to 213 by class to satisfy the insufficient bandwidth.

Each of the ATM nodes 220 to 223 has a class-based VPC 2 of the MVPC 201 whose own node is the starting point.
The release of the VCCs accommodated in the 10-213 or the change of the band causes the VPCs 210-213 for each class to share the VP.
When there is a surplus in the band that has been satisfied from C214, the surplus band is returned to the shared VPC 214. in this way,
By setting an MVPC in which a plurality of class-specific VPCs with different classes on the same physical path and given a band in advance and a shared VPC that can share the band with these classes are grouped, the band of the class-specific VPC is It is possible to compensate for the shortage using the band of the shared VPC, and to reduce the excess band to the shared VPC when the band of the VPC for each class becomes excessive.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a block diagram showing a configuration of the ATM nodes 220 to 223 shown in FIG. The ATM node shown in FIG.
R (SegmentAndReasmble) 3
11, a VCC control device 312, an MVPC band management device 313, a buffer / shaper control device 314,
And a VPC buffer / shaper unit 315.

The above MVPC buffer / shaper section 31
5 is prepared for each MVPC, and includes a cell branching unit 316, class-specific buffers 320 to 323, and a shared buffer 324.
, And shapers 330 to 333, and a cell merging section 317. In the example of FIG. 2, the number of MVPCs is two. Here, the data cell from the incoming line 301 is the cell handler 31
0, each MVPC is exchanged,
The data is sent to the PC buffer / shaper unit 315. MVP
The cells input to the C buffer / shaper unit 315 are input to the class buffers 320 to 323 in the cell branching unit 316 according to the classes A to D.

Class-specific buffers 320, 321, 32
2 and 323 store cells of classes A, B, C and D, respectively, and formers 330, 331, 332 and 33, respectively.
3 in response to the cell output command. The cells output from the class buffers 320 to 323 are cell-multiplexed between the classes A to D in the cell multiplexing unit (cell merging unit) 317 and output from the outgoing line 302 as MVPC.

On the other hand, the control cell from the incoming line 301 is exchanged by the cell handler 310 and sent to the SAR 311.
The control cell sent from the cell handler 310 to the SAR 311 is bucketed in the SAR 311 and is
The data is transferred to the control device 312 or the MVPC band management device 313. The VCC control device 312 analyzes the bucket from the SAR 311, sets / releases the route of the VCC, and issues a request for setting / release of the bandwidth of the VCC according to the MVPC.
Notify the band management device 313. The MVPC band management device 313 is connected to the VCC control device 312 or the SAR 311
VPC2 by class when a bandwidth setting / release request is received from
10 to 213 are changed.

Here, the buffer / shaper controller 314
When a band is added by changing the VPC band from the MVPC band management device 313, a part of the shared buffer 324 is linked to the desired class buffers 320 to 323 to increase the buffer length of the class buffers 320 to 323. I do. Also, the buffer / shaper control device 314
By changing the values of the desired shapers 330 to 333, the cell output rates of the desired class buffers 320 to 323 are increased, and the allocated bandwidth of the class VPCs 210 to 213 is increased. Also, the VPC from the MVPC band management device 313
When the bandwidth is reduced by changing the bandwidth, the buffer / shaper control device 314 determines the desired class-based buffers 320 to
A part of H.323 is linked to the shared buffer 324, and the buffer length of the class-specific buffers 320 to 323 is reduced. The buffer / shaper control device 314 changes the values of the desired shapers 330 to 333, lowers the cell output rate from the desired class buffers 320 to 323, and reduces the bandwidth of the class VPCs 210 to 213. And
After these processes are completed, the buffer / shaper control device 314 notifies the MVPC band management device 313 of the completion of the processes.

Next, referring to FIG. 2, each ATM node 2 in FIG.
The bandwidth control of the MVPC 201 executed in 20 to 223 will be described by taking as an example a case where a terminal 230 issues a class A VCC setting / release request or a VCC band change request to the terminal 231. Here, to simplify the description, the VCC from the terminal 230 to the terminal 231 is MVPC 201a.
MVPC 201a is a one-way connection with the ATM node 220 as a start point and the ATM node 222 as an end point.

First, in the terminal 230, a VCC setting / release request or a VCC band change request is used as a control cell by the AT.
Send to M node 220. The control cell from the terminal 230 is sent to the SAR 311 via the incoming line 301 of the ATM node 220 at the start point of the MVPC 201a and the cell handler 310. In the SAR 311, the control cell is assembled into a VCC setting / release request or a VCC band change request and
Transfer to the C control device 312. VCC controller 312
Is VCC if the request was a VCC setup request
Determines the VPC route through which the packet passes, issues a VCC band addition request to the MVPC band management device 313, and
The PC path and VCC band setting amount are notified. Also, VCC
If the request from terminal 230 is a VCC release or VCC band reduction request, control device 312 transmits the MVP
Issues a VCC band reduction request to the C band management device 313,
The VPC route and the VCC band reduction amount are notified. In the present embodiment, a VPC via a VCC is a VP for each class.
C210.

The MVPC band management device 313 of the ATM node 220 receives the VCC band addition request from the VCC control device 312 and allocates the band of the class-specific VPC 210 to the VCC. By allocating a part of the band of the shared VPC 214 among the bands of the class-based VPC 210 to the class-based VPC 210, the shortfall is satisfied. Also, A
The MVPC band management device 313 of the TM node 220
Receiving a VCC band reduction request from the CC controller 312,
When reducing the bandwidth of VCC, VPC 210 for each class
When a surplus bandwidth is generated, a part of the bandwidth allocated from the shared VPC 214 is returned to the bandwidth of the shared VPC 214.

When the bandwidth of the class-specific VPC 210 is changed in this way, the MVPC bandwidth management unit 313 of the ATM node 220 sends the buffer / shaper control unit 31
4 notifies the change of the band of the VPC 210 for each class. In this case, if the band change notification of the class-specific VPC 210 from the MVPC band management device 313 increases the allocated band, the buffer / shaper control device 314 of the ATM node 220 transfers a part of the shared buffer 324 to the class buffer 32.
Linking to 0 increases the buffer length, increases the value of the shaper 330, and increases the cell output rate from the class-specific buffer 320.

Conversely, if the bandwidth change notification from the MVPC bandwidth management device 313 indicates that the allocated bandwidth has decreased, the buffer / shaper control device 314 of the ATM node 220 links a part of the class-specific buffer 320 to the shared buffer 324. Then, the buffer length is shortened, the value of the shaper 330 is reduced, and the cell output rate from the class-specific buffer 320 is reduced. Then, the buffer /
The shaper control device 314 controls the MVPC band management device 31
Then, a notification of the completion of the change of the band of the VPC 210 for each class is issued to No. 3.

The MVPC band management unit 313, which has received the class change completion notification of the VPC 210 for each class from the buffer / shaper control unit 314 of the ATM node 220,
The C band change notification is sent to the SAR 311. SAR31
1 transmits a VPC band change notification to the cell handler 310 as a control cell. The cell handler 310 of the ATM node 220 transfers the control cell to the MVPC buffer / shaper unit 315. The control cell is transmitted from the MVPC buffer / shaper unit 315 via the outgoing line 302 to the MVPC 201a.
ATM nodes 221 and 2 at the transit points (relay points) and the end points
22.

Class-based VPC from ATM node 220
The control cell of the band change 210 is the input line 3 of each of the ATM nodes 221 and 222 at the passing point and the end point of the MVPC 201a.
01, transferred to the SAR 311 via the cell handler 310. SAR 311 of each of the ATM nodes 221 and 222
Assembles the control cell into a band change notification and combines it with the MVP
It is sent to the C band management device 313. ATM node 22
The MVPC band management devices 313 of Nos. 1 and 222 notify the buffer change of the buffer / shaper control device 314 of the own node.

In each of the buffer / shaper control devices 314 of the ATM nodes 221 and 222, the MV of the MVPC 201a that performs the band change in the same manner as the ATM node 220.
The buffer length of the class-specific buffer 220 used by the class A of the PC buffer / shaper unit 315 and its shaper 3
Change the value of 30. The buffer / shaper control devices 314 of the ATM nodes 221 and 222 issue a class change completion notification of the VPC 210 for each class to the MVPC band management device 313.

After that, each MVPC band management device 313 of the ATM nodes 221 and 222
Is transferred to the SAR 311. ATM
Each SAR 311 of the nodes 221 and 222 has a class-specific V
The notification of the completion of the band change of the PC 210 is set to the control cell. The control cell is transferred from the outgoing line 302 to the ATM node 220 at the start point of the MVPC 201a via the cell handler 310 and the MVPC buffer / shaper unit 315. As described above, the change of the bandwidth of the class-based VPC 210 of the MVPC 201a is completed in each of the ATM nodes 220 to 223 on the route. After this process, each ATM node transfers the data on the class-specific VPC 210 in the changed band.

As described above, in the second embodiment of the present invention, as described in the first embodiment, first, the MVP
The ATM node serving as the starting point of C controls the band change of the VPC for each class. Then, the control result is notified to all the ATM nodes on the MVPC route, and the bandwidth of the class-specific VPC is changed at each ATM node, whereby the class-specific VPC from the start point to the end point of the MVPC is changed.
The bandwidth of the PC can be changed.

Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 3 shows each A shown in FIG.
It is a block diagram which shows the structure of TM node 220-223. The ATM node shown in FIG.
, SAR 412, VCC controller 413, MVP
It comprises a C band management unit 414, a buffer / shaper control unit 415, an MVPC buffer / shaper unit 416, and a class-specific VPC cell flow rate monitoring unit 410.

The MVPC buffer / shaper unit 417
As in the case of FIG.
, Class-specific buffers 420 to 423, a shared buffer 424, shapers 430 to 433, and a cell merging unit 41.
And 8. In the example of FIG. 3, the number of MVPCs is two. Here, the data cells from the incoming line 401 are sent to the VPC cell flow rate monitoring device 410 for each class. The class-based VPC cell flow rate monitoring device 410 can
The actual flow band is calculated by measuring the cell flow rates of 0 to 213. The class-based VPC cell flow rate monitoring device 410 compares the measured use band with a preset band, and notifies the MVPC band management device 414 of the comparison result when a condition described later is satisfied. Also, the class-specific VPC cell flow rate monitoring device 410 stores the data cells in the cell handler 411.
To send to.

The data cells are exchanged for each MVPC in the cell handler 411 and sent to the desired MVPC buffer / shaper unit 417. The cells input to the MVPC buffer / shaper unit 417 are input to class-specific buffers 420 to 423 in the cell branching unit 417 according to the classes A to D. Class-specific buffer 4
20, 421, 422, and 423 are class A, respectively.
The cells of B, C, and D are stored, and the shapers 430,
The cell is output in accordance with the cell output commands 431, 432, and 433.

The cells output from the class-specific buffers 420 to 423 are cell-multiplexed between classes in a cell multiplexing unit (cell merging unit) 418, and output from the outgoing line 402 as MVPC. On the other hand, control cells from the incoming line 401 are exchanged in the cell handler 411 and sent to the SAR 412. The control cells transmitted from the cell handler 411 to the SAR 412 are bucketed in the SAR 412 and transferred to the VCC control device 413.

The VCC control device 413 analyzes the bucket from the SAR 412 to perform the setting / release of the VCC route, and notifies the MVPC band management device 414 of the accompanying band setting / release request. MVPC band management device 414
Is the comparison result between the set bandwidth from the class-based VPC cell flow rate monitoring device 410 and the measurement, or the VCC control device 41
3 based on the VCC band setting / release band request. V by class
When changing the bandwidth of the PCs 210 to 213, the buffer / shaper controller 415 is notified of the desired classes A to D and the amount of change in bandwidth.

The buffer / shaper control unit 415 uses M
When a band is added by changing the VPC band from the VPC band management device 414, a part of the shared buffer 424 is linked to the class buffers 420 to 423 to increase the buffer length of the class buffers 420 to 423. Also, the buffer / shaper control device 415 changes the values of the desired shapers 430 to 433, increases the cell output rate from the desired class buffers 420 to 423, and increases the allocated bandwidth of the class VPCs 210 to 213. .
When the bandwidth is reduced by changing the VPC bandwidth from the MVPC bandwidth management apparatus 414, the buffer / shaper control apparatus 415 sends the desired class-specific buffers 420 to 42 to each other.
3 is linked to the shared buffer 424, and the buffer length of the class-specific buffers 420 to 423 is reduced. Also,
The buffer / shaper controller 415 changes the values of the desired shapers 430 to 433, lowers the cell output rate of the desired class buffers 420 to 423, and
The bandwidth of the PCs 210 to 213 is reduced. After these processes are completed, the buffer / shaper controller 415
It notifies the VPC band management device 414 of the end of the process.

Next, referring to FIG. 3, the MVP of the ATM network shown in FIG.
Regarding the bandwidth control of C201, terminal 230 to terminal 231
An example will be described in which a class A VCC setting / release request or a VCC band change request is issued. For the sake of simplicity, it is assumed that the VCC from the terminal 230 to the terminal 231 uses the MVPC 201a as a route, and the MVP
The C201a is a one-way connection starting at the ATM node 220 and ending at the ATM node 222.

The terminal 230 sends a VCC setting / release request or a VCC band change request to the ATM node 220 as a control cell. The control cell from terminal 230 is MV
Incoming line 40 of ATM node 220 at the starting point of PC 201a
1. The data is sent to the SAR 412 via the VPC cell flow rate monitoring device 410 and the cell handler 411 for each class. The SAR 412 of the ATM node 220 assembles the control cell into a VCC setting / release request or a VCC band change request, and transfers the request to the VCC control device 413. VCC of ATM node 220
When the request is a VCC setting request, the control device 413 determines a VCC route through which the VCC passes, issues a VCC band addition request to the MVPC band management device 414 of its own node, and sets the VPC route and the VCC to set the band. Notify the bandwidth setting amount.

When the request from the terminal 230 is a VCC release or a VCC band reduction request, the VCC control device 413 of the ATM node 220 issues a VCC band reduction request to the MVPC band management device 414. V
The PC route and the VCC band reduction amount are notified. In the present embodiment, the VPC via the VCC is a VPC 21 for each class.
0. The MVPC band management device 414 of the ATM node 220 receives the VCC band addition request from the VCC control device 413 and, when allocating the band of the class-based VPC 210 to the VCC, if the band of the class-based VPC 210 is insufficient. The shortage is satisfied by allocating a part of the band of the VPC 214 to the class-specific VPC 210.

When the MVPC band management device 414 of the ATM node 220 receives the VCC band reduction request from the VCC control device 413 and reduces the VCC band,
If a surplus band is generated in the class-based VPC 210, a part of the band allocated from the shared VPC 214 among the bands of the class-based VPC 210 is returned to the band of the shared VPC 214. Here, the buffer / shaper control device 415 of the ATM node 220 that has been notified of the class A band change,
The buffer length of the class A class-specific buffer 420 of the MVPC buffer / shaper unit 417 of the PC 201a and the value of the shaper 430 are changed. That is, ATM node 2
The buffer / shaper controller 415 of the MVPC
If the bandwidth change notification from the bandwidth management device 414 indicates an increase in the allocated bandwidth, a part of the shared buffer 424 is linked to the class-specific buffer 420 to increase the buffer length, and the value of the shaper 430 is increased to increase the value of the class-specific buffer. Increase the cell output rate from 420.

Conversely, if the band change notification from the MVPC band management unit 414 is a decrease in the allocated band, the buffer / shaper control unit 415 of the ATM node 220 links a part of the class-specific buffer 420 to the shared buffer 424. Then, the buffer length is shortened, the value of the shaper 430 is reduced, and the cell output rate from the class-specific buffer 420 is reduced. Then, the buffer /
The shaper control device 415 controls the MVPC band management device 41
No. 4 is notified of the change of the band. And then, A
It notifies the MVPC band management device 414 of the TM node 220 of the completion of the class A band change. Thus, the change of the band of the class-specific VPC 210 in the ATM node 220 is completed.

AT of passing point / ending point of MVPC 201a
The M nodes 221 and 222 measure the cell flow rate on the class-specific VPC 210 in the class-specific VPC cell flow monitoring device 410 for the data cells passing through the incoming line 401, and calculate the measurement band. The VPC cell flow rate monitoring device 410 for each class of the ATM nodes 221 and 222
It is necessary to change the bandwidth of C210.
The class-specific VPC 210 and the amount of band change are notified to the PC band management device 414. The MVPC band management device 414 of each of the ATM nodes 221 and 222 has its own buffer /
The band change is notified to the shaper control device 415.

The buffer / shaper control device 41 of the ATM nodes 221 and 222 that have received the class A bandwidth change notification
5 changes the buffer length of the class-specific buffer 420 used by the class A of the MVPC buffer / shaper unit 417 of the MVPC 201a and the value of the shaper 430 in the same manner as the ATM node 220. As described above, MVPC
The band change of the VPC 210 for each class 201a is completed in the ATM nodes 220 to 223 on the route.

As described above, in the third embodiment, the MVP
The ATM node serving as the starting point of C controls the band change of the class-based VPC, and all the ATM nodes on the MVPC path measure the band of the class-based VPC and detect the band change autonomously. By performing the change, it becomes possible to control the change of the band of the class-specific VPC from the start point to the end point of the MVPC.

[0046]

As described above, according to the present invention, a plurality of class-specific VPCs having different classes on the same physical path and given a pre-band, and a shared VPC which can configure these classes are grouped. The MVPC is configured, and when the band of the class-specific VPC runs short, the band is compensated using the band of the shared VPC, and when the band of the class-specific VPC becomes surplus, the surplus portion is allocated to the shared VPC. By performing the reduction, it is possible to efficiently use the bandwidth of the network, reduce the bandwidth acquisition processing, and guarantee the quality according to the class. Further, the ATM node serving as the start point of the MVPC controls the change of the bandwidth of the class-based VPC, notifies all the ATM nodes on the MVPC path of the control result, and each ATM node sets the bandwidth of the class-based VPC. By making changes, MVPC
From the start point to the end point of VPC. Also, the ATM node serving as the starting point of the MVPC controls the band change of the VPC for each class, and
All ATM nodes on the path of the PC detect band change of VPC by class and perform band change autonomously, thereby enabling change control of band of VPC by class from the start point to the end point of MVPC. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an ATM network according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an ATM node according to a second embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of an ATM node according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of an ATM network for explaining a conventional grouped VPC control method.

[Explanation of symbols]

201: MVPC, 210 to 213: VPC by class,
214: shared VPC, 220 to 223: ATM node,
230, 231 ... terminals, 301, 401 ... data input lines,
302, 402 ... data outgoing lines, 310, 411 ... cell handlers, 311, 412 ... SAR, 312, 413 ... V
CC control device, 313, 414 ... MVPC band management device, 314, 415 ... buffer / shaper control device, 3
15,416 ... buffer / shaper unit, 316,417
… Cell branch part, 317,418… cell junction part, 320 ~
323, 420 to 423: buffer by class, 324
424: Shared buffer, 330 to 333, 430 to 43
3. Shaper, 410: VPC cell flow rate monitoring device for each class.

Claims (2)

(57) [Claims] A plurality of asynchronous transfer mode switching devices between a start point and an end point, a plurality of virtual path connections on the same path exchanged by each of the asynchronous transfer mode switching devices and transmitted by the same link; a shared virtual path connection having a bandwidth that is shared by the plurality of virtual path connections via said plurality of virtual path connections in the same path, the previous SL plurality of virtual path connections between the shared virtual path connection multiplexing, and the Means for supplementing the excess or deficiency of the bandwidth of the virtual path connection with the bandwidth of the shared virtual path connection.
Note that each of the asynchronous transfer mode switching devices is at least
Buffer capacity is allocated for each virtual path connection
A plurality of buffers and the plurality of virtual path connections.
A shared buffer whose buffer capacity is shared by
Cell output speed from buffers provided for every number of buffers
A plurality of buffer output speed adjustment units for controlling
Virtual path connection and shared virtual path connection
Virtual path connection bandwidth management to manage each bandwidth
And an asynchronous transfer mode of a start point on the same path
The virtual path connection bandwidth management unit of the switching device
When the bandwidth of the virtual path connection becomes excessive or insufficient,
The plurality of virtual path connections to be managed and the shared virtual
Change the bandwidth of each path connection and relay
Less for point and end point asynchronous transfer mode switching equipment
Send band change information that includes the band to be changed
Asynchronous transfer mode switching device at the starting point and said bandwidth change information
The asynchronous transfer mode switching device that has received the
The capacity of a part of the shared buffer according to the bandwidth
Buffer capacity and buffer output speed control.
By controlling the adjuster to change the cell output speed,
A multiplexing method for a group of virtual path connections, wherein the bandwidth of the plurality of virtual path connections is changed . 2. The method of claim 1, wherein the asynchronous transfer mode switching device, the bandwidth changes by measuring the bandwidth usage of each of the previous SL plurality of virtual path connections test
Double comprising a band change detection unit for output, the virtual path connection bandwidth management section of the front SL asynchronous transfer mode switching device of the starting point on the same path, the excess and deficiency of the band of the virtual path connection occurs, to manage itself Change the bandwidth of each of the number of virtual path connections and the shared virtual path connections ,
Partial capacity of the shared buffer according to the bandwidth of the change
Is assigned to the capacity of the buffer, and
The power speed adjustment unit is controlled to change the cell output speed, and
Intermediate and end point asynchronous transfer mode switching equipment on one path
Is the used band measured by the band change detection unit.
Changing the bandwidth of the plurality of virtual path connections by allocating a part of the capacity of the shared buffer to the capacity of the buffer in accordance with and changing the cell output rate by controlling the buffer output rate adjusting unit. A multiplexing method for a group of virtual path connections, characterized in that: