JPH07154392A - Path band setting control system - Google Patents

Abstract

PURPOSE:To perform the reservation control of a band for the unit of a path at a network to use an ATM system. CONSTITUTION:A band managing part 16 receives the band reserving request of the path and outputs a band setting instruction to both the terminal nodes (such as nodes 1 and 2 in this example) of the path at the reserved time designated by the reserving request. A path information managing part 13 of the node 1 manages the setting and deletion of the path and the connecting relation of the path and outputs the band reserving request of this path with the setting and deletion of the path and when this band setting instruction is received, the band of the path is set at a value applied by. the band setting instruction. When the band setting instruction is received, the path information managing part (not shown in the figure) of the node 2 sets the band of the path at this value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a path band setting control system in an ATM communication network, and more particularly to a control technique for providing a path band setting reservation service.

[0002]

2. Description of the Related Art Conventionally, in a wide area leased line network using the ATM (Asynchronous Transfer Mode) system, the band of the leased line is fixedly determined in advance below the transmission capacity of the leased line. Therefore, the user selects a dedicated line having a necessary band and receives the service. On the other hand, the technology to dynamically change the bandwidth of the leased line can be realized by controlling the amount of ATM cells flowing into the network at both ends of the path (Kenichi Sato, Satoshi Ohta, Ikuo Uzawa, using the concept of "private path"). Structure of Wide Area Integrated Transmission Network "IEICE Transactions VOL.72-B-1, No1
1 pp.904-916,1989).

By combining the bandwidth control technology and the path reservation technology, the system can provide a reserved service for a dedicated line of an arbitrary band, and the service capability of the network is dramatically improved. But to do that, set the path /
Under the condition that deletion is frequently performed, it is necessary to strictly manage the bandwidth of the physical link based on the reservation information of each path, and the invention of an efficient control technique for that is desired.

[0004]

SUMMARY OF THE INVENTION The conventional ATM described above.
In the wide area leased line network using the method, the bandwidth of the leased line is fixedly determined in advance, and an arbitrary bandwidth service is provided to the user at an arbitrary time by utilizing the bandwidth control technology of the ATM network. There was a drawback that you couldn't.

[0005]

[Means for Solving the Problems] The first invention is an ATM.
In a path bandwidth setting control method for setting a leased line path in a wide area leased line network using the (asynchronous transfer mode) method, a bandwidth reservation request for the path is accepted, and the path is reserved at a reservation time designated by the reservation request. And a bandwidth management unit that outputs a bandwidth setting instruction to both end nodes of the path, and manages the setting and deletion of the path and the connection relationship of the path, and outputs the bandwidth reservation request of the path according to the setting and deletion of the path. One of the both end nodes that sets the bandwidth of the path to the value given by the bandwidth setting instruction when receiving the setting instruction, and the both ends that sets the bandwidth of the path to the value when receiving the bandwidth setting instruction It is characterized in that it is provided with the other one of the nodes.

The second aspect of the present invention is capable of accepting a band reservation request in a path band setting control method for setting a leased line path in a wide area leased line network using an ATM (Asynchronous Transfer Mode) system. If the request is acceptable, the reserved bandwidth of the path and the reserved time are set in the bandwidth management information database that is provided in advance, and the bandwidth management is notified to both end nodes of the path at the reserved time. Section, and when receiving a command to set or delete the path, in the case of the path setting, path information including information of a predetermined type related to the path and connection relation information at each node in the path are generated and provided in advance. The band which is held in the database and which is a setting request for the band of the band designated by the command When a reservation request is output and the path is deleted, the path information and the connection relation information in the database are deleted, and the band reservation request, which is a setting request for the path of a predetermined band, is output to set the band. And a first path information management unit for setting a usage parameter for setting a band of the path to a value given by the band setting instruction with respect to a first path termination point for changing the band when receiving the instruction. The usage parameter for setting the bandwidth of the path to the value given by the instruction is set for one of the both end nodes and the second path termination point for changing the bandwidth when receiving the bandwidth setting instruction. The other end node having the second path information management unit is provided.

[0007]

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a path management system according to the present invention, and FIG. 2 is a flow chart showing processing of setting / deletion of a path in the path information management unit 13 and reservation of a bandwidth management unit 16. It is a figure. Although not shown in FIG. 1, the path information management unit 13 is provided in each node, and the band management unit 16 that manages the band management information 17 exists independently of the nodes. And have a physical connection.

As an example, it is assumed that the path 12 is set between the path termination points 7 and 8 of the two communication nodes 1 and 2 through the physical links 5 and 6. Connection relationship 9, 10,
11 is set in each of the nodes 1, 2 and 3 in order to realize the path. The actual bandwidth of the path is
It is determined by the control of the inflow cell based on the usage parameter (FIGS. 2 and 19) at the path termination points 7 and 8. The detailed information of the path including the established path, that is, the identification number of the path, the band, the node number to be relayed, and the like are held in the path information database 15 at one of the both end nodes of the path.

Now, assuming that a path setting or deletion command S22 (user request) is given in the state (waiting for request) of S21 (FIG. 2) of the path information management unit 13 of the terminal node 1, first, S23 ( In the case of setting, the command is determined in (processing type determination), and in the case of setting, S24 (setting / deletion processing)
In, the path information and the connection relationship are generated, set in the path information database 15 and the connection relationship database 18, respectively, and when the processing is completed, the process returns to S21. The connection relationship is the connection relationship 9, 10, 11 of each node.

At this time, the path setting or deletion is performed in the band 0.
It is possible to execute the processing only by the path information management unit 13 without affecting the bandwidth management information 17 because it is executed only for the path. Therefore, at the time of setting the path, the usage parameter of the end points 7 and 8 of the path must be defined as band 0 (a state in which the inflow of ATM cells is prohibited). In addition, when deleting a path, it is necessary to execute a change processing (reservation of bandwidth change and activation of the reservation) so that the bandwidth of the path becomes 0 before the processing.

If the command determined in S23 is bandwidth reservation, it is issued as a reservation request to the bandwidth management unit 16 in S25 (reservation processing request). By S26 (reservation acceptance processing) of the bandwidth management unit 16, whether or not the reservation can be accepted is calculated, and the result is returned to S25 and, if acceptable, the reserved bandwidth of the path and the reservation time are managed by the bandwidth. Set to information 17. In S25, after receiving the response from S26, the process returns to S21.

Further, when a certain reservation becomes valid, in S27 (reservation issuing process) of the bandwidth management unit 16,
The band change notification is sent to the path information management units 13 of the nodes 1 and 2 at both ends.
S28 (parameter change process) is notified. In S28, the bandwidth value of the path in the path information database 15 and the usage parameter 19 at the path termination points 7 and 8 of both end nodes 1 and 2 are realized as the bandwidth value required after the time when the reservation is valid. To change.

[0014]

As described above, the present invention has the following effects. In the wide area leased line network using the ATM system, the following effects can be obtained by enabling the bandwidth setting reservation service of the path by utilizing the bandwidth control technology of the conventional ATM network.

An arbitrary band setting service can be provided for a path at an arbitrary time, and the serviceability of the network is dramatically improved.

When a path is set or deleted, it can be executed without referring to the information of the band management unit, so that the load on the band management unit due to the setting / deletion request is not imposed.

Since there is only one bandwidth management unit, bandwidth management data for physical links can be centrally managed.

The path information management section 1 for one path
Since it exists in the node, consistency control of the path information becomes easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a path management system of the present invention.

FIG. 2 is a flowchart showing a process of setting / deleting a path of a path information management unit 13 and a reservation process of a bandwidth management unit 16 in the present embodiment.

[Explanation of symbols]

 1,2,3 Communication node 4,5,6 Physical link 7,8 Path termination point 9,10,11 Connection relationship within node 12 Path route 13 Path information management unit at node 1 15 Path information database 16 Bandwidth management Part 17 Bandwidth information management information 18 Connection relation database 19 Usage parameters

Claims (2)

[Claims] 1. In a path bandwidth setting control method for setting a leased line path in a wide area leased line network using an ATM (Asynchronous Transfer Mode) method, a bandwidth reservation request for the path is accepted and designated by the reservation request. A bandwidth management unit that outputs a bandwidth setting instruction to both end nodes of the path at a reserved time,
Manage the deletion and connection relationship of the path, set the path,
One of the nodes at both ends that sets the bandwidth reservation request for the path upon deletion and receives the bandwidth setting instruction, and sets the bandwidth of the path to the value given by the bandwidth setting instruction, and the bandwidth setting instruction. The path bandwidth setting control method, comprising: a node other than the both end nodes that sets the bandwidth of the path to the value when receiving the received path. 2. A path bandwidth setting control method for setting a leased line path in a wide area leased line network using an ATM (Asynchronous Transfer Mode) method, calculates whether or not a bandwidth reservation request can be accepted, and calculates the request. If the path can be accepted, a bandwidth management unit that sets a reserved bandwidth and a reserved time of the path in a bandwidth management information database provided in advance and notifies a band setting notification to both end nodes of the path at the reserved time, When receiving a setting or deletion command, in the case of the path setting, path information including information of a predetermined type related to the path and connection relation information at each node in the path are generated and stored in a database provided in advance, and Before outputting the bandwidth reservation request, which is a setting request for the path of the bandwidth instructed by the command In the case of path deletion, the path information and the connection relationship information in the database are deleted, and the band reservation request, which is a setting request to the path of a predetermined band, is output and the band is set when the band setting instruction is received. Of one of the both end nodes having a first path information management unit for setting a usage parameter for setting the band of the path to the value given by the band setting instruction with respect to the first path termination point Node and second path information that sets the usage parameter that sets the band of the path to the value given by the command for the second path termination point that changes the band when receiving the band setting command A path bandwidth setting control method comprising: the other end node having a management unit.