JPS63305644A - Isdn data transfer control system - Google Patents

Abstract

PURPOSE:To control the increasing decreasing number of required links in response to the quantity of data transfer by informing mutually the number of operating channels for data transmission of variable multi-links of two systems connected via a service overall digital network to control data transmission. CONSTITUTION:If no data link connection is established between two systems connected via an ISDN 3, when a data link establishing request is sent from a data terminator or a data transmission terminator 4 to a variable multi-link controller 2, the request is accepted by a data link service interface section 21. After a parameter is received from a data link service interface section 21, a variable multi-link control section 23 informs the presence of data link establishing and an initial multi-link number to a variable multi-link control section in a data link establishing request opposite station system via the ISDN 3 through a D-channel control section 25 and an ISDN interface section 26.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to an integrated service digital network (hereinafter referred to as 15DN).
The present invention relates to a data transfer control method between two systems connected via a network (hereinafter referred to as "internet service digital network data transfer control method"), and particularly relates to an integrated service digital network data transfer control method suitable for cases where the amount of data transfer varies greatly.

[Conventional technology]

For conventional multilink control techniques in 15DN, see, for example, CCT, Redbook, X-25, Lapbee.

(1980) pp. 251-263 [CCITT
, Rad Book, X-25, LAP-B (19
80) discussed in PP251-263).

In other words, this document describes the multi-link procedure as follows:
A technique is described that has the capability of distributing and reordering packets over multiple data transfer paths.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, charges are charged according to the connection time (fees when public ones such as telephone lines, etc. are used) such as L5DN as a multi-link data transfer path.
However, the problem is that it is impossible to add the number of multi-links as the amount of data transfer increases.

Additionally, there is a problem in that it is impossible to release links that are no longer needed due to a decrease in the amount of data transfer.

The present invention has been made to solve the above problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide a comprehensive service digital network data transfer control system that allows controlling the number of required links to increase or decrease in accordance with the amount of data transfer in multi-links.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

Among the present inventions made to achieve the above object, a brief outline of typical ones is as follows.

That is, in the data transfer control system in the 15DN that can provide multiple data transfer paths, data transfer amount monitoring means and variable multi-link control means are provided between the data link service interface and the service integrated digital network interface, and the service integrated The main feature is that two systems connected via a digital network mutually notify each other of the number of variable multilink data transfer channels used to control data transfer.

It also has an I5DN interface for the I5DN that can provide multiple data transfer paths, and a data link service interface for the data termination device that operates at layer 3 or higher of the open system interconnection release model, and connects the data termination device and the data line. a means for monitoring data transfer amount between terminating devices (or data terminating devices); a data transfer channel control means for an integrated service digital network; a call control channel control means for controlling a call of the group of data transfer channels; This is a variable multi-link control device for I5DN connection, characterized in that it is comprised of variable multi-link control means having control interfaces with each component.

[Effect]

According to the above means, in the ISDN data transfer control system, the data transfer amount monitoring means notifies the variable multilink control means of the data transfer amount status at regular intervals. Also,
The data link service interface notifies the variable multilink control means of the requested quality of service.

The variable multi-link control means increases or decreases the number of data transfer paths necessary to satisfy the requested quality of service based on the above two pieces of information, but whether the establishment of the data link is a request from the own station's system or a request from the other station's system. Depending on the data transfer channel (hereinafter referred to as B
The initiative to connect or disconnect a channel (called a channel) is transferred.

The variable multilink control means on the system side takes the initiative in connecting or disconnecting data transfer channels.

First, an increase or decrease in the number of B channels used is notified to the variable multilink control means on the other side's side. The variable multilink control having the initiative connects or disconnects the B channel after receiving an acknowledgment from the partner system.

The control procedure dynamically controls the increase/decrease in the number of B channels used.

〔Example〕

An ISDN data transfer control system according to an embodiment of the present invention will be specifically described below with reference to one drawing.

In addition, in an attempt to explain the embodiments, parts having the same functions are given the same reference numerals, and repeated explanation thereof will be omitted.

FIG. 1 is an example of a multilink connection to which the present invention is applied. In Figure 1, the multilink connection system is a data termination device! (hereinafter referred to as DTE) l or data line termination equipment g! (hereinafter referred to as DCE) 4 is connected to the 15DN 3 via the variable multilink control device 2. And DXE (DTEL or DCE4) and variable multi-link control bag! ! An I5DN interface 6 is provided between the variable multilink control device 2 and the I5DN 3.

The 15DN interface 6 includes, for example, a B channel that transfers two pieces of data, and one call control channel (hereinafter referred to as a D channel) that performs call control of the B channel group (2B channel).
+D), 23 B channels and 1 D channel (23B+D), 30 B channels and 1 D channel (30B+D), etc.

Here, open system interconnection (hereinafter referred to as
The level of control procedures for data transfer in O8I will be briefly explained.

As shown in Figure 2, the O3I data transfer control procedure levels include the physical layer, data link layer, network layer,
..., and the data link layer uses a high-level data link control procedure HDLC (High
1 level Data Link Control)
This system performs order management, recovery management, flow rate management, etc. of data transfer between systems.

FIG. 3 shows the variable multi-link control device E2 shown in FIG.
FIG. 2 is a block diagram for explaining the schematic configuration of the FIG. In FIG. 3, the variable multilink control table f12 is
(DTEl or DCE4) and l5DN3. DXE is data link service interface section 2
1 to the data transfer amount monitoring unit 22 and variable multilink control unit 23, respectively. The data transfer amount monitoring section 22 is composed of a microcomputer, etc., and is used to transfer data between the data link service interface section 21 and the B channel control section 24, and to monitor the status of the data transfer amount at regular intervals. It is.

The B channel control unit 24 is a variable multilink control unit 23
The B channel is connected or disconnected under the control of the B channel. The D channel control unit 25 performs packet control and the original B
It is used to perform call control for channels and to perform simple communications.

The l5DN interface 26 is for controlling multiplexing of the D channel and B channel group when inputting and outputting data to and from the l5DN3.

The variable multi-link control section 23, the B channel control section 24, and the D channel control section 25 are each composed of, for example, a microcomputer.

Next, the operation of the variable multilink control table e2 will be explained using FIG.

When a data link connection is not established between two systems connected via l5DN3, DXE
(When using DTEI or DCE4) A data link establishment request is made from the variable multilink control table W12.
This request is accepted by the data link service interface unit 21. At the time of the data link establishment request, the requested service quality and the initial number of multilinks are notified to the data link service interface section 21 as parameters. Quality of service is the maximum allowable delay time at the data link layer. That is, the maximum allowable delay time in data transfer between DXEs is the required service quality.

The requested service quality and the initial number of multilinks may not be specified at the time of the data link establishment request, but may be set in advance in the data link service interface section 21.

Next, after receiving the above-mentioned parameters from the data link service interface section 21, the variable multilink control section 23 performs a data link via the D channel control section 25 and the I5DN interface section 26 via the I5DN 3. The variable multilink control unit in the establishment request partner system is notified of the fact that there is a request to establish a data link and the initial number of multilinks.

The variable multilink control unit 23 on the side that first received the data link establishment request has the initiative to connect or disconnect the B channel used as the multilink data transfer path, and the data link establishment request is received from the partner station system. The variable multilink control unit 23 on the side that has been notified of the request has no initiative.

Variable multi-link control unit 23 on the data link establishment request side
The first step is to connect the number of B channels specified by the initial number of multilinks to the 15DN through the D channel control unit 25.
Request 3. It also notifies the B channel control unit 24 of the initial number of multilinks.

Through the above procedure, a multilink is established between the two systems, and data transfer is started.

After the start of data transfer, the data transfer amount monitoring unit 22 monitors the data transfer amount status at regular intervals to the variable multi-link control unit 2.
Notify 3. The variable multilink control unit 23 calculates the average utilization rate of each B channel based on the data transfer amount status and the current number of data transfer channels, and further calculates the average service required time. Then, the current average service required time and the requested service quality are compared.

If the current quality of service is poor compared to the required quality of service, it is necessary to increase the number of data transfer channels used in multilink.

Conversely, if the current quality of service is sufficiently better than the required quality of service, it is necessary to reduce the number of data transfer channels to the extent that the required quality of service is satisfied.

The above determination is made by the variable multi-link control unit 23, and when an increase or decrease in the number of data transfer channels occurs, the variable multi-link control unit 23 of the partner station system first determines the increase or decrease in B.
You will receive instructions regarding the channel. After receiving the confirmation response from the variable multilink control unit 23 of the partner station system, the variable multilink control unit 23 notifies the B channel control unit 24 that the number of multilink B channels will be increased or decreased, and B to the D channel control unit 25
Instructs to connect or disconnect a channel.

By doing so, the number of multilink data transfer paths can be dynamically optimized depending on the amount of data transfer.

According to this embodiment, an acknowledgment is made between the variable multi-link control units 23 of the two systems connected via the 15DN to the notification of increase/decrease in the number of links, so transfers due to dynamic increase/decrease in the number of links are performed. Data loss can be prevented.

In addition, even if the B channel of 15DN, which is charged according to the connection time, is used as a data transfer path for multilink, it is possible to control the optimal number of links that satisfy the required service quality. Necessary line costs can be kept low while satisfying the required service quality.

Although the present invention has been specifically described above based on the above-described embodiments, the present invention is not limited to the above-mentioned embodiments, but only within the scope of the invention.

Of course, various modifications can be made.

〔Effect of the invention〕

As explained above, according to the present invention, as a multi-link data transfer path, the l5 is charged according to the connection time.
Even if you use the B channel of the DN.

Since it is possible to control the optimum number of links that satisfy the required service quality, there is an effect that the line cost required for performing multi-linking can be kept low while satisfying the required service quality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a multi-link connection to which the present invention is applied, and FIG. 2 is a diagram for explaining the level of a data transfer control procedure in O8I of the first embodiment. FIG. 3 is a block diagram showing a schematic configuration of a variable multilink control device according to an embodiment of the present invention. In the figure, 1...DTE, 2...Variable multilink control device, 3...15DN, 4...DCE, 5...Data link service interface, 6...15DN
Interface, 21... Data link service interface section, 22... Data transfer amount monitoring section, 23.
...Variable multi-link control section, 24...B channel control section, 25...D channel control section, 2d...15D
This is the N interface engineering department.

Claims (1)

[Claims] 1. In a data transfer control method in an integrated service digital network (ISDN) that can provide multiple data transfer paths, data transfer is performed to monitor the status of data transfer between a data link service interface and an integrated service digital network interface. A variable multi-link control means for controlling the increase/decrease of the number of data transfer paths is provided, and the variable multi-link control means for data transfer of two systems connected via a comprehensive service digital network is provided according to the data transfer amount. ISDN characterized by controlling data transfer by mutually notifying the number of channels used
Data transfer control method.